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<title>GstBuffer: GStreamer 1.0 Core Reference Manual</title>
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<a href="#GstBuffer.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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<h2><span class="refentrytitle"><a name="GstBuffer.top_of_page"></a>GstBuffer</span></h2>
<p>GstBuffer — Data-passing buffer type</p>
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<div class="refsect1">
<a name="GstBuffer.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-FLAGS:CAPS" title="GST_BUFFER_FLAGS()">GST_BUFFER_FLAGS</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-FLAG-IS-SET:CAPS" title="GST_BUFFER_FLAG_IS_SET()">GST_BUFFER_FLAG_IS_SET</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-FLAG-SET:CAPS" title="GST_BUFFER_FLAG_SET()">GST_BUFFER_FLAG_SET</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-FLAG-UNSET:CAPS" title="GST_BUFFER_FLAG_UNSET()">GST_BUFFER_FLAG_UNSET</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-PTS:CAPS" title="GST_BUFFER_PTS()">GST_BUFFER_PTS</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-DTS:CAPS" title="GST_BUFFER_DTS()">GST_BUFFER_DTS</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-DURATION:CAPS" title="GST_BUFFER_DURATION()">GST_BUFFER_DURATION</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-OFFSET:CAPS" title="GST_BUFFER_OFFSET()">GST_BUFFER_OFFSET</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-OFFSET-END:CAPS" title="GST_BUFFER_OFFSET_END()">GST_BUFFER_OFFSET_END</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="GstBuffer.html#GST-BUFFER-OFFSET-NONE:CAPS" title="GST_BUFFER_OFFSET_NONE">GST_BUFFER_OFFSET_NONE</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-DURATION-IS-VALID:CAPS" title="GST_BUFFER_DURATION_IS_VALID()">GST_BUFFER_DURATION_IS_VALID</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-PTS-IS-VALID:CAPS" title="GST_BUFFER_PTS_IS_VALID()">GST_BUFFER_PTS_IS_VALID</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-DTS-IS-VALID:CAPS" title="GST_BUFFER_DTS_IS_VALID()">GST_BUFFER_DTS_IS_VALID</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-OFFSET-IS-VALID:CAPS" title="GST_BUFFER_OFFSET_IS_VALID()">GST_BUFFER_OFFSET_IS_VALID</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-OFFSET-END-IS-VALID:CAPS" title="GST_BUFFER_OFFSET_END_IS_VALID()">GST_BUFFER_OFFSET_END_IS_VALID</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#GST-BUFFER-IS-DISCONT:CAPS" title="GST_BUFFER_IS_DISCONT()">GST_BUFFER_IS_DISCONT</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-new" title="gst_buffer_new ()">gst_buffer_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-new-allocate" title="gst_buffer_new_allocate ()">gst_buffer_new_allocate</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-new-wrapped" title="gst_buffer_new_wrapped ()">gst_buffer_new_wrapped</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-new-wrapped-full" title="gst_buffer_new_wrapped_full ()">gst_buffer_new_wrapped_full</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-ref" title="gst_buffer_ref ()">gst_buffer_ref</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-unref" title="gst_buffer_unref ()">gst_buffer_unref</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gsize</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-get-sizes" title="gst_buffer_get_sizes ()">gst_buffer_get_sizes</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gsize</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-get-size" title="gst_buffer_get_size ()">gst_buffer_get_size</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gsize</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-get-sizes-range" title="gst_buffer_get_sizes_range ()">gst_buffer_get_sizes_range</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-resize-range" title="gst_buffer_resize_range ()">gst_buffer_resize_range</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-resize" title="gst_buffer_resize ()">gst_buffer_resize</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-set-size" title="gst_buffer_set_size ()">gst_buffer_set_size</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-get-max-memory" title="gst_buffer_get_max_memory ()">gst_buffer_get_max_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstMemory.html" title="GstMemory"><span class="returnvalue">GstMemory</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-peek-memory" title="gst_buffer_peek_memory ()">gst_buffer_peek_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-n-memory" title="gst_buffer_n_memory ()">gst_buffer_n_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-insert-memory" title="gst_buffer_insert_memory ()">gst_buffer_insert_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-replace-memory-range" title="gst_buffer_replace_memory_range ()">gst_buffer_replace_memory_range</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstMemory.html" title="GstMemory"><span class="returnvalue">GstMemory</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-get-memory-range" title="gst_buffer_get_memory_range ()">gst_buffer_get_memory_range</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-remove-memory-range" title="gst_buffer_remove_memory_range ()">gst_buffer_remove_memory_range</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-find-memory" title="gst_buffer_find_memory ()">gst_buffer_find_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-prepend-memory" title="gst_buffer_prepend_memory ()">gst_buffer_prepend_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-append-memory" title="gst_buffer_append_memory ()">gst_buffer_append_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-replace-memory" title="gst_buffer_replace_memory ()">gst_buffer_replace_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-replace-all-memory" title="gst_buffer_replace_all_memory ()">gst_buffer_replace_all_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstMemory.html" title="GstMemory"><span class="returnvalue">GstMemory</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-get-memory" title="gst_buffer_get_memory ()">gst_buffer_get_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstMemory.html" title="GstMemory"><span class="returnvalue">GstMemory</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-get-all-memory" title="gst_buffer_get_all_memory ()">gst_buffer_get_all_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-remove-memory" title="gst_buffer_remove_memory ()">gst_buffer_remove_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-remove-all-memory" title="gst_buffer_remove_all_memory ()">gst_buffer_remove_all_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-is-all-memory-writable" title="gst_buffer_is_all_memory_writable ()">gst_buffer_is_all_memory_writable</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-is-memory-range-writable" title="gst_buffer_is_memory_range_writable ()">gst_buffer_is_memory_range_writable</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-map" title="gst_buffer_map ()">gst_buffer_map</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-map-range" title="gst_buffer_map_range ()">gst_buffer_map_range</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-unmap" title="gst_buffer_unmap ()">gst_buffer_unmap</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-memcmp" title="gst_buffer_memcmp ()">gst_buffer_memcmp</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gsize</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-extract" title="gst_buffer_extract ()">gst_buffer_extract</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-extract-dup" title="gst_buffer_extract_dup ()">gst_buffer_extract_dup</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gsize</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-fill" title="gst_buffer_fill ()">gst_buffer_fill</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gsize</span>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-memset" title="gst_buffer_memset ()">gst_buffer_memset</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="GstBuffer.html#GST-BUFFER-COPY-METADATA:CAPS" title="GST_BUFFER_COPY_METADATA">GST_BUFFER_COPY_METADATA</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="GstBuffer.html#GST-BUFFER-COPY-ALL:CAPS" title="GST_BUFFER_COPY_ALL">GST_BUFFER_COPY_ALL</a></td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-copy" title="gst_buffer_copy ()">gst_buffer_copy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-copy-into" title="gst_buffer_copy_into ()">gst_buffer_copy_into</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-copy-region" title="gst_buffer_copy_region ()">gst_buffer_copy_region</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-copy-deep" title="gst_buffer_copy_deep ()">gst_buffer_copy_deep</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-is-writable" title="gst_buffer_is_writable()">gst_buffer_is_writable</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-make-writable" title="gst_buffer_make_writable()">gst_buffer_make_writable</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-replace" title="gst_buffer_replace ()">gst_buffer_replace</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-append" title="gst_buffer_append ()">gst_buffer_append</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-append-region" title="gst_buffer_append_region ()">gst_buffer_append_region</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gstreamer-GstMeta.html#GstMeta" title="struct GstMeta"><span class="returnvalue">GstMeta</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-get-meta" title="gst_buffer_get_meta ()">gst_buffer_get_meta</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gstreamer-GstMeta.html#GstMeta" title="struct GstMeta"><span class="returnvalue">GstMeta</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-add-meta" title="gst_buffer_add_meta ()">gst_buffer_add_meta</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-remove-meta" title="gst_buffer_remove_meta ()">gst_buffer_remove_meta</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gstreamer-GstMeta.html#GstMeta" title="struct GstMeta"><span class="returnvalue">GstMeta</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-iterate-meta" title="gst_buffer_iterate_meta ()">gst_buffer_iterate_meta</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="GstBuffer.html#GstBufferForeachMetaFunc" title="GstBufferForeachMetaFunc ()">*GstBufferForeachMetaFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-foreach-meta" title="gst_buffer_foreach_meta ()">gst_buffer_foreach_meta</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html#GstParentBufferMeta" title="struct GstParentBufferMeta"><span class="returnvalue">GstParentBufferMeta</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-add-parent-buffer-meta" title="gst_buffer_add_parent_buffer_meta ()">gst_buffer_add_parent_buffer_meta</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBuffer.html#gst-buffer-get-parent-buffer-meta" title="gst_buffer_get_parent_buffer_meta()">gst_buffer_get_parent_buffer_meta</a><span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstBuffer.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstBuffer.html#GstBuffer-struct" title="struct GstBuffer">GstBuffer</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="GstBuffer.html#GstBufferFlags" title="enum GstBufferFlags">GstBufferFlags</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="GstBuffer.html#GstBufferCopyFlags" title="enum GstBufferCopyFlags">GstBufferCopyFlags</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstBuffer.html#GstParentBufferMeta" title="struct GstParentBufferMeta">GstParentBufferMeta</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstBuffer.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="https://developer.gnome.org/gobject/unstable/gobject-Boxed-Types.html">GBoxed</a>
<span class="lineart">╰──</span> GstBuffer
</pre>
</div>
<div class="refsect1">
<a name="GstBuffer.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/gst.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GstBuffer.description"></a><h2>Description</h2>
<p>Buffers are the basic unit of data transfer in GStreamer. They contain the
timing and offset along with other arbitrary metadata that is associated
with the <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> blocks that the buffer contains.</p>
<p>Buffers are usually created with <a class="link" href="GstBuffer.html#gst-buffer-new" title="gst_buffer_new ()"><code class="function">gst_buffer_new()</code></a>. After a buffer has been
created one will typically allocate memory for it and add it to the buffer.
The following example creates a buffer that can hold a given video frame
with a given width, height and bits per plane.</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9</pre></td>
<td class="listing_code"><pre class="programlisting">GstBuffer <span class="gtkdoc opt">*</span>buffer<span class="gtkdoc opt">;</span>
GstMemory <span class="gtkdoc opt">*</span>memory<span class="gtkdoc opt">;</span>
gint size<span class="gtkdoc opt">,</span> width<span class="gtkdoc opt">,</span> height<span class="gtkdoc opt">,</span> bpp<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">...</span>
size <span class="gtkdoc opt">=</span> width <span class="gtkdoc opt">*</span> height <span class="gtkdoc opt">*</span> bpp<span class="gtkdoc opt">;</span>
buffer <span class="gtkdoc opt">=</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBuffer.html#gst-buffer-new">gst_buffer_new</a></span> <span class="gtkdoc opt">();</span>
memory <span class="gtkdoc opt">=</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstAllocator.html#gst-allocator-alloc">gst_allocator_alloc</a></span> <span class="gtkdoc opt">(</span>NULL<span class="gtkdoc opt">,</span> size<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBuffer.html#gst-buffer-insert-memory">gst_buffer_insert_memory</a></span> <span class="gtkdoc opt">(</span>buffer<span class="gtkdoc opt">, -</span><span class="number">1</span><span class="gtkdoc opt">,</span> memory<span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">...</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p></p>
<p>Alternatively, use <a class="link" href="GstBuffer.html#gst-buffer-new-allocate" title="gst_buffer_new_allocate ()"><code class="function">gst_buffer_new_allocate()</code></a> to create a buffer with
preallocated data of a given size.</p>
<p>Buffers can contain a list of <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> objects. You can retrieve how many
memory objects with <a class="link" href="GstBuffer.html#gst-buffer-n-memory" title="gst_buffer_n_memory ()"><code class="function">gst_buffer_n_memory()</code></a> and you can get a pointer
to memory with <a class="link" href="GstBuffer.html#gst-buffer-peek-memory" title="gst_buffer_peek_memory ()"><code class="function">gst_buffer_peek_memory()</code></a></p>
<p>A buffer will usually have timestamps, and a duration, but neither of these
are guaranteed (they may be set to <a class="link" href="GstClock.html#GST-CLOCK-TIME-NONE:CAPS" title="GST_CLOCK_TIME_NONE"><span class="type">GST_CLOCK_TIME_NONE</span></a>). Whenever a
meaningful value can be given for these, they should be set. The timestamps
and duration are measured in nanoseconds (they are <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> values).</p>
<p>The buffer DTS refers to the timestamp when the buffer should be decoded and
is usually monotonically increasing. The buffer PTS refers to the timestamp when
the buffer content should be presented to the user and is not always
monotonically increasing.</p>
<p>A buffer can also have one or both of a start and an end offset. These are
media-type specific. For video buffers, the start offset will generally be
the frame number. For audio buffers, it will be the number of samples
produced so far. For compressed data, it could be the byte offset in a
source or destination file. Likewise, the end offset will be the offset of
the end of the buffer. These can only be meaningfully interpreted if you
know the media type of the buffer (the preceding CAPS event). Either or both
can be set to <a class="link" href="GstBuffer.html#GST-BUFFER-OFFSET-NONE:CAPS" title="GST_BUFFER_OFFSET_NONE"><span class="type">GST_BUFFER_OFFSET_NONE</span></a>.</p>
<p>gst_buffer_ref() is used to increase the refcount of a buffer. This must be
done when you want to keep a handle to the buffer after pushing it to the
next element. The buffer refcount determines the writability of the buffer, a
buffer is only writable when the refcount is exactly 1, i.e. when the caller
has the only reference to the buffer.</p>
<p>To efficiently create a smaller buffer out of an existing one, you can
use <a class="link" href="GstBuffer.html#gst-buffer-copy-region" title="gst_buffer_copy_region ()"><code class="function">gst_buffer_copy_region()</code></a>. This method tries to share the memory objects
between the two buffers.</p>
<p>If a plug-in wants to modify the buffer data or metadata in-place, it should
first obtain a buffer that is safe to modify by using
<a class="link" href="GstBuffer.html#gst-buffer-make-writable" title="gst_buffer_make_writable()"><code class="function">gst_buffer_make_writable()</code></a>. This function is optimized so that a copy will
only be made when it is necessary.</p>
<p>Several flags of the buffer can be set and unset with the
<a class="link" href="GstBuffer.html#GST-BUFFER-FLAG-SET:CAPS" title="GST_BUFFER_FLAG_SET()"><code class="function">GST_BUFFER_FLAG_SET()</code></a> and <a class="link" href="GstBuffer.html#GST-BUFFER-FLAG-UNSET:CAPS" title="GST_BUFFER_FLAG_UNSET()"><code class="function">GST_BUFFER_FLAG_UNSET()</code></a> macros. Use
<a class="link" href="GstBuffer.html#GST-BUFFER-FLAG-IS-SET:CAPS" title="GST_BUFFER_FLAG_IS_SET()"><code class="function">GST_BUFFER_FLAG_IS_SET()</code></a> to test if a certain <a class="link" href="GstBuffer.html#GstBufferFlags" title="enum GstBufferFlags"><span class="type">GstBufferFlags</span></a> flag is set.</p>
<p>Buffers can be efficiently merged into a larger buffer with
<a class="link" href="GstBuffer.html#gst-buffer-append" title="gst_buffer_append ()"><code class="function">gst_buffer_append()</code></a>. Copying of memory will only be done when absolutely
needed.</p>
<p>Arbitrary extra metadata can be set on a buffer with <a class="link" href="GstBuffer.html#gst-buffer-add-meta" title="gst_buffer_add_meta ()"><code class="function">gst_buffer_add_meta()</code></a>.
Metadata can be retrieved with <a class="link" href="GstBuffer.html#gst-buffer-get-meta" title="gst_buffer_get_meta ()"><code class="function">gst_buffer_get_meta()</code></a>. See also <a class="link" href="gstreamer-GstMeta.html#GstMeta" title="struct GstMeta"><span class="type">GstMeta</span></a></p>
<p>An element should either unref the buffer or push it out on a src pad
using <a class="link" href="GstPad.html#gst-pad-push" title="gst_pad_push ()"><code class="function">gst_pad_push()</code></a> (see <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>).</p>
<p>Buffers are usually freed by unreffing them with <a class="link" href="GstBuffer.html#gst-buffer-unref" title="gst_buffer_unref ()"><code class="function">gst_buffer_unref()</code></a>. When
the refcount drops to 0, any memory and metadata pointed to by the buffer is
unreffed as well. Buffers allocated from a <a class="link" href="GstBufferPool.html" title="GstBufferPool"><span class="type">GstBufferPool</span></a> will be returned to
the pool when the refcount drops to 0.</p>
<p>The <a class="link" href="GstBuffer.html#GstParentBufferMeta" title="struct GstParentBufferMeta"><span class="type">GstParentBufferMeta</span></a> is a meta which can be attached to a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>
to hold a reference to another buffer that is only released when the child
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> is released.</p>
<p>Typically, <a class="link" href="GstBuffer.html#GstParentBufferMeta" title="struct GstParentBufferMeta"><span class="type">GstParentBufferMeta</span></a> is used when the child buffer is directly
using the <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> of the parent buffer, and wants to prevent the parent
buffer from being returned to a buffer pool until the <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> is available
for re-use. (Since 1.6)</p>
</div>
<div class="refsect1">
<a name="GstBuffer.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="GST-BUFFER-FLAGS:CAPS"></a><h3>GST_BUFFER_FLAGS()</h3>
<pre class="programlisting">#define GST_BUFFER_FLAGS(buf) GST_MINI_OBJECT_FLAGS(buf)
</pre>
<p>A flags word containing <a class="link" href="GstBuffer.html#GstBufferFlags" title="enum GstBufferFlags"><span class="type">GstBufferFlags</span></a> flags set on this buffer.</p>
<div class="refsect3">
<a name="id-1.3.7.8.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-FLAG-IS-SET:CAPS"></a><h3>GST_BUFFER_FLAG_IS_SET()</h3>
<pre class="programlisting">#define GST_BUFFER_FLAG_IS_SET(buf,flag) GST_MINI_OBJECT_FLAG_IS_SET (buf, flag)
</pre>
<p>Gives the status of a specific flag on a buffer.</p>
<div class="refsect3">
<a name="id-1.3.7.8.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>flag</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstBuffer.html#GstBufferFlags" title="enum GstBufferFlags"><span class="type">GstBufferFlags</span></a> flag to check.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-FLAG-SET:CAPS"></a><h3>GST_BUFFER_FLAG_SET()</h3>
<pre class="programlisting">#define GST_BUFFER_FLAG_SET(buf,flag) GST_MINI_OBJECT_FLAG_SET (buf, flag)
</pre>
<p>Sets a buffer flag on a buffer.</p>
<div class="refsect3">
<a name="id-1.3.7.8.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>flag</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstBuffer.html#GstBufferFlags" title="enum GstBufferFlags"><span class="type">GstBufferFlags</span></a> flag to set.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-FLAG-UNSET:CAPS"></a><h3>GST_BUFFER_FLAG_UNSET()</h3>
<pre class="programlisting">#define GST_BUFFER_FLAG_UNSET(buf,flag) GST_MINI_OBJECT_FLAG_UNSET (buf, flag)
</pre>
<p>Clears a buffer flag.</p>
<div class="refsect3">
<a name="id-1.3.7.8.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>flag</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstBuffer.html#GstBufferFlags" title="enum GstBufferFlags"><span class="type">GstBufferFlags</span></a> flag to clear.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-PTS:CAPS"></a><h3>GST_BUFFER_PTS()</h3>
<pre class="programlisting">#define GST_BUFFER_PTS(buf) (GST_BUFFER_CAST(buf)-&gt;pts)
</pre>
<p>The presentation timestamp (pts) in nanoseconds (as a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a>)
of the data in the buffer. This is the timestamp when the media should be
presented to the user.
Value will be <a class="link" href="GstClock.html#GST-CLOCK-TIME-NONE:CAPS" title="GST_CLOCK_TIME_NONE"><code class="literal">GST_CLOCK_TIME_NONE</code></a> if the pts is unknown.</p>
<div class="refsect3">
<a name="id-1.3.7.8.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.:</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-DTS:CAPS"></a><h3>GST_BUFFER_DTS()</h3>
<pre class="programlisting">#define GST_BUFFER_DTS(buf) (GST_BUFFER_CAST(buf)-&gt;dts)
</pre>
<p>The decoding timestamp (dts) in nanoseconds (as a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a>)
of the data in the buffer. This is the timestamp when the media should be
decoded or processed otherwise.
Value will be <a class="link" href="GstClock.html#GST-CLOCK-TIME-NONE:CAPS" title="GST_CLOCK_TIME_NONE"><code class="literal">GST_CLOCK_TIME_NONE</code></a> if the dts is unknown.</p>
<div class="refsect3">
<a name="id-1.3.7.8.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.:</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-DURATION:CAPS"></a><h3>GST_BUFFER_DURATION()</h3>
<pre class="programlisting">#define GST_BUFFER_DURATION(buf) (GST_BUFFER_CAST(buf)-&gt;duration)
</pre>
<p>The duration in nanoseconds (as a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a>) of the data in the buffer.
Value will be <a class="link" href="GstClock.html#GST-CLOCK-TIME-NONE:CAPS" title="GST_CLOCK_TIME_NONE"><code class="literal">GST_CLOCK_TIME_NONE</code></a> if the duration is unknown.</p>
<div class="refsect3">
<a name="id-1.3.7.8.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-OFFSET:CAPS"></a><h3>GST_BUFFER_OFFSET()</h3>
<pre class="programlisting">#define GST_BUFFER_OFFSET(buf) (GST_BUFFER_CAST(buf)-&gt;offset)
</pre>
<p>The offset in the source file of the beginning of this buffer.</p>
<div class="refsect3">
<a name="id-1.3.7.8.9.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-OFFSET-END:CAPS"></a><h3>GST_BUFFER_OFFSET_END()</h3>
<pre class="programlisting">#define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER_CAST(buf)-&gt;offset_end)
</pre>
<p>The offset in the source file of the end of this buffer.</p>
<div class="refsect3">
<a name="id-1.3.7.8.10.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-OFFSET-NONE:CAPS"></a><h3>GST_BUFFER_OFFSET_NONE</h3>
<pre class="programlisting">#define GST_BUFFER_OFFSET_NONE ((guint64)-1)
</pre>
<p>Constant for no-offset return results.</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-DURATION-IS-VALID:CAPS"></a><h3>GST_BUFFER_DURATION_IS_VALID()</h3>
<pre class="programlisting">#define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer)))
</pre>
<p>Tests if the duration is known.</p>
<div class="refsect3">
<a name="id-1.3.7.8.12.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-PTS-IS-VALID:CAPS"></a><h3>GST_BUFFER_PTS_IS_VALID()</h3>
<pre class="programlisting">#define GST_BUFFER_PTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_PTS (buffer)))
</pre>
<p>Tests if the pts is known.</p>
<div class="refsect3">
<a name="id-1.3.7.8.13.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-DTS-IS-VALID:CAPS"></a><h3>GST_BUFFER_DTS_IS_VALID()</h3>
<pre class="programlisting">#define GST_BUFFER_DTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DTS (buffer)))
</pre>
<p>Tests if the dts is known.</p>
<div class="refsect3">
<a name="id-1.3.7.8.14.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-OFFSET-IS-VALID:CAPS"></a><h3>GST_BUFFER_OFFSET_IS_VALID()</h3>
<pre class="programlisting">#define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE)
</pre>
<p>Tests if the start offset is known.</p>
<div class="refsect3">
<a name="id-1.3.7.8.15.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-OFFSET-END-IS-VALID:CAPS"></a><h3>GST_BUFFER_OFFSET_END_IS_VALID()</h3>
<pre class="programlisting">#define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE)
</pre>
<p>Tests if the end offset is known.</p>
<div class="refsect3">
<a name="id-1.3.7.8.16.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BUFFER-IS-DISCONT:CAPS"></a><h3>GST_BUFFER_IS_DISCONT()</h3>
<pre class="programlisting">#define GST_BUFFER_IS_DISCONT(buffer) (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
</pre>
<p>Tests if the buffer marks a discontinuity in the stream.</p>
<div class="refsect3">
<a name="id-1.3.7.8.17.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-new"></a><h3>gst_buffer_new ()</h3>
<pre class="programlisting"><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
gst_buffer_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Creates a newly allocated buffer without any data.</p>
<p>MT safe.</p>
<div class="refsect3">
<a name="id-1.3.7.8.18.6"></a><h4>Returns</h4>
<p> the new <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-new-allocate"></a><h3>gst_buffer_new_allocate ()</h3>
<pre class="programlisting"><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
gst_buffer_new_allocate (<em class="parameter"><code><a class="link" href="GstAllocator.html" title="GstAllocator"><span class="type">GstAllocator</span></a> *allocator</code></em>,
<em class="parameter"><code><span class="type">gsize</span> size</code></em>,
<em class="parameter"><code><a class="link" href="GstAllocator.html#GstAllocationParams"><span class="type">GstAllocationParams</span></a> *params</code></em>);</pre>
<p>Tries to create a newly allocated buffer with data of the given size and
extra parameters from <em class="parameter"><code>allocator</code></em>
. If the requested amount of memory can't be
allocated, <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> will be returned. The allocated buffer memory is not cleared.</p>
<p>When <em class="parameter"><code>allocator</code></em>
is <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, the default memory allocator will be used.</p>
<p>Note that when <em class="parameter"><code>size</code></em>
== 0, the buffer will not have memory associated with it.</p>
<p>MT safe.</p>
<div class="refsect3">
<a name="id-1.3.7.8.19.8"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>allocator</p></td>
<td class="parameter_description"><p> the <a class="link" href="GstAllocator.html" title="GstAllocator"><span class="type">GstAllocator</span></a> to use, or <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to use the
default allocator. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>the size in bytes of the new buffer's data.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>params</p></td>
<td class="parameter_description"><p> optional parameters. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.19.9"></a><h4>Returns</h4>
<p> a new <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>, or <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if
the memory couldn't be allocated. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-new-wrapped"></a><h3>gst_buffer_new_wrapped ()</h3>
<pre class="programlisting"><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
gst_buffer_new_wrapped (<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>,
<em class="parameter"><code><span class="type">gsize</span> size</code></em>);</pre>
<p>Creates a new buffer that wraps the given <em class="parameter"><code>data</code></em>
. The memory will be freed
with g_free and will be marked writable.</p>
<p>MT safe.</p>
<div class="refsect3">
<a name="id-1.3.7.8.20.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p> data to wrap. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=size][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> guint8][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>allocated size of <em class="parameter"><code>data</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.20.7"></a><h4>Returns</h4>
<p> a new <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-new-wrapped-full"></a><h3>gst_buffer_new_wrapped_full ()</h3>
<pre class="programlisting"><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
gst_buffer_new_wrapped_full (<em class="parameter"><code><a class="link" href="GstMemory.html#GstMemoryFlags" title="enum GstMemoryFlags"><span class="type">GstMemoryFlags</span></a> flags</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>,
<em class="parameter"><code><span class="type">gsize</span> maxsize</code></em>,
<em class="parameter"><code><span class="type">gsize</span> offset</code></em>,
<em class="parameter"><code><span class="type">gsize</span> size</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>Allocate a new buffer that wraps the given memory. <em class="parameter"><code>data</code></em>
must point to
<em class="parameter"><code>maxsize</code></em>
of memory, the wrapped buffer will have the region from <em class="parameter"><code>offset</code></em>
and
<em class="parameter"><code>size</code></em>
visible.</p>
<p>When the buffer is destroyed, <em class="parameter"><code>notify</code></em>
will be called with <em class="parameter"><code>user_data</code></em>
.</p>
<p>The prefix/padding must be filled with 0 if <em class="parameter"><code>flags</code></em>
contains
<a class="link" href="GstMemory.html#GST-MEMORY-FLAG-ZERO-PREFIXED:CAPS"><span class="type">GST_MEMORY_FLAG_ZERO_PREFIXED</span></a> and <a class="link" href="GstMemory.html#GST-MEMORY-FLAG-ZERO-PADDED:CAPS"><span class="type">GST_MEMORY_FLAG_ZERO_PADDED</span></a> respectively.</p>
<div class="refsect3">
<a name="id-1.3.7.8.21.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>flags</p></td>
<td class="parameter_description"><p><a class="link" href="GstMemory.html#GstMemoryFlags" title="enum GstMemoryFlags"><span class="type">GstMemoryFlags</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p> data to wrap. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=size][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> guint8][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>maxsize</p></td>
<td class="parameter_description"><p>allocated size of <em class="parameter"><code>data</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p>offset in <em class="parameter"><code>data</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>size of valid data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p> user_data. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>notify</p></td>
<td class="parameter_description"><p> called with <em class="parameter"><code>user_data</code></em>
when the memory is freed. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="The callback is valid until first called."><span class="acronym">scope async</span></acronym>][<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym> user_data]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.21.8"></a><h4>Returns</h4>
<p> a new <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-ref"></a><h3>gst_buffer_ref ()</h3>
<pre class="programlisting"><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
gst_buffer_ref (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buf</code></em>);</pre>
<p>Increases the refcount of the given buffer by one.</p>
<p>Note that the refcount affects the writability
of <em class="parameter"><code>buf</code></em>
and its metadata, see <a class="link" href="GstBuffer.html#gst-buffer-is-writable" title="gst_buffer_is_writable()"><code class="function">gst_buffer_is_writable()</code></a>.
It is important to note that keeping additional references to
GstBuffer instances can potentially increase the number
of memcpy operations in a pipeline.</p>
<div class="refsect3">
<a name="id-1.3.7.8.22.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.22.7"></a><h4>Returns</h4>
<p> <em class="parameter"><code>buf</code></em>
. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-unref"></a><h3>gst_buffer_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_unref (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buf</code></em>);</pre>
<p>Decreases the refcount of the buffer. If the refcount reaches 0, the buffer
with the associated metadata and memory will be freed.</p>
<div class="refsect3">
<a name="id-1.3.7.8.23.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p> a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-get-sizes"></a><h3>gst_buffer_get_sizes ()</h3>
<pre class="programlisting"><span class="returnvalue">gsize</span>
gst_buffer_get_sizes (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><span class="type">gsize</span> *offset</code></em>,
<em class="parameter"><code><span class="type">gsize</span> *maxsize</code></em>);</pre>
<p>Get the total size of the memory blocks in <em class="parameter"><code>b</code></em>
.</p>
<p>When not <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, <em class="parameter"><code>offset</code></em>
will contain the offset of the data in the
first memory block in <em class="parameter"><code>buffer</code></em>
and <em class="parameter"><code>maxsize</code></em>
will contain the sum of
the size and <em class="parameter"><code>offset</code></em>
and the amount of extra padding on the last
memory block. <em class="parameter"><code>offset</code></em>
and <em class="parameter"><code>maxsize</code></em>
can be used to resize the
buffer memory blocks with <a class="link" href="GstBuffer.html#gst-buffer-resize" title="gst_buffer_resize ()"><code class="function">gst_buffer_resize()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.7.8.24.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p> a pointer to the offset. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>maxsize</p></td>
<td class="parameter_description"><p> a pointer to the maxsize. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.24.7"></a><h4>Returns</h4>
<p> total size of the memory blocks in <em class="parameter"><code>buffer</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-get-size"></a><h3>gst_buffer_get_size ()</h3>
<pre class="programlisting"><span class="returnvalue">gsize</span>
gst_buffer_get_size (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>Get the total size of the memory blocks in <em class="parameter"><code>buffer</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.7.8.25.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.25.6"></a><h4>Returns</h4>
<p> total size of the memory blocks in <em class="parameter"><code>buffer</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-get-sizes-range"></a><h3>gst_buffer_get_sizes_range ()</h3>
<pre class="programlisting"><span class="returnvalue">gsize</span>
gst_buffer_get_sizes_range (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> length</code></em>,
<em class="parameter"><code><span class="type">gsize</span> *offset</code></em>,
<em class="parameter"><code><span class="type">gsize</span> *maxsize</code></em>);</pre>
<p>Get the total size of <em class="parameter"><code>length</code></em>
memory blocks stating from <em class="parameter"><code>idx</code></em>
in <em class="parameter"><code>buffer</code></em>
.</p>
<p>When not <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, <em class="parameter"><code>offset</code></em>
will contain the offset of the data in the
memory block in <em class="parameter"><code>buffer</code></em>
at <em class="parameter"><code>idx</code></em>
and <em class="parameter"><code>maxsize</code></em>
will contain the sum of the size
and <em class="parameter"><code>offset</code></em>
and the amount of extra padding on the memory block at <em class="parameter"><code>idx</code></em>
+
<em class="parameter"><code>length</code></em>
-1.
<em class="parameter"><code>offset</code></em>
and <em class="parameter"><code>maxsize</code></em>
can be used to resize the buffer memory blocks with
<a class="link" href="GstBuffer.html#gst-buffer-resize-range" title="gst_buffer_resize_range ()"><code class="function">gst_buffer_resize_range()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.7.8.26.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>an index</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p>a length</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p> a pointer to the offset. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>maxsize</p></td>
<td class="parameter_description"><p> a pointer to the maxsize. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.26.7"></a><h4>Returns</h4>
<p> total size of <em class="parameter"><code>length</code></em>
memory blocks starting at <em class="parameter"><code>idx</code></em>
in <em class="parameter"><code>buffer</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-resize-range"></a><h3>gst_buffer_resize_range ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_buffer_resize_range (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> length</code></em>,
<em class="parameter"><code><span class="type">gssize</span> offset</code></em>,
<em class="parameter"><code><span class="type">gssize</span> size</code></em>);</pre>
<p>Set the total size of the <em class="parameter"><code>length</code></em>
memory blocks starting at <em class="parameter"><code>idx</code></em>
in
<em class="parameter"><code>buffer</code></em>
</p>
<div class="refsect3">
<a name="id-1.3.7.8.27.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>an index</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p>a length</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p>the offset adjustment</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>the new size or -1 to just adjust the offset</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.27.6"></a><h4>Returns</h4>
<p> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if resizing succeeded, <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-resize"></a><h3>gst_buffer_resize ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_resize (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><span class="type">gssize</span> offset</code></em>,
<em class="parameter"><code><span class="type">gssize</span> size</code></em>);</pre>
<p>Set the offset and total size of the memory blocks in <em class="parameter"><code>buffer</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.7.8.28.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p>the offset adjustment</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>the new size or -1 to just adjust the offset</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-set-size"></a><h3>gst_buffer_set_size ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_set_size (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><span class="type">gssize</span> size</code></em>);</pre>
<p>Set the total size of the memory blocks in <em class="parameter"><code>buffer</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.7.8.29.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>the new size</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-get-max-memory"></a><h3>gst_buffer_get_max_memory ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
gst_buffer_get_max_memory (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Get the maximum amount of memory blocks that a buffer can hold. This is a
compile time constant that can be queried with the function.</p>
<p>When more memory blocks are added, existing memory blocks will be merged
together to make room for the new block.</p>
<div class="refsect3">
<a name="id-1.3.7.8.30.6"></a><h4>Returns</h4>
<p> the maximum amount of memory blocks that a buffer can hold.</p>
</div>
<p class="since">Since: <a class="link" href="ix06.html#api-index-1.2">1.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-peek-memory"></a><h3>gst_buffer_peek_memory ()</h3>
<pre class="programlisting"><a class="link" href="GstMemory.html" title="GstMemory"><span class="returnvalue">GstMemory</span></a> *
gst_buffer_peek_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>);</pre>
<p>Get the memory block at <em class="parameter"><code>idx</code></em>
in <em class="parameter"><code>buffer</code></em>
. The memory block stays valid until
the memory block in <em class="parameter"><code>buffer</code></em>
is removed, replaced or merged, typically with
any call that modifies the memory in <em class="parameter"><code>buffer</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.7.8.31.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>an index</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.31.6"></a><h4>Returns</h4>
<p> the <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> at <em class="parameter"><code>idx</code></em>
. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-n-memory"></a><h3>gst_buffer_n_memory ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
gst_buffer_n_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>Get the amount of memory blocks that this buffer has. This amount is never
larger than what <a class="link" href="GstBuffer.html#gst-buffer-get-max-memory" title="gst_buffer_get_max_memory ()"><code class="function">gst_buffer_get_max_memory()</code></a> returns.</p>
<div class="refsect3">
<a name="id-1.3.7.8.32.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.32.6"></a><h4>Returns</h4>
<p> the amount of memory block in this buffer. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-insert-memory"></a><h3>gst_buffer_insert_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_insert_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> idx</code></em>,
<em class="parameter"><code><a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> *mem</code></em>);</pre>
<p>Insert the memory block <em class="parameter"><code>mem</code></em>
to <em class="parameter"><code>buffer</code></em>
at <em class="parameter"><code>idx</code></em>
. This function takes ownership
of <em class="parameter"><code>mem</code></em>
and thus doesn't increase its refcount.</p>
<p>Only <a class="link" href="GstBuffer.html#gst-buffer-get-max-memory" title="gst_buffer_get_max_memory ()"><code class="function">gst_buffer_get_max_memory()</code></a> can be added to a buffer. If more memory is
added, existing memory blocks will automatically be merged to make room for
the new memory.</p>
<div class="refsect3">
<a name="id-1.3.7.8.33.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>the index to add the memory at, or -1 to append it to the end</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mem</p></td>
<td class="parameter_description"><p> a <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-replace-memory-range"></a><h3>gst_buffer_replace_memory_range ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_replace_memory_range (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> length</code></em>,
<em class="parameter"><code><a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> *mem</code></em>);</pre>
<p>Replaces <em class="parameter"><code>length</code></em>
memory blocks in <em class="parameter"><code>buffer</code></em>
starting at <em class="parameter"><code>idx</code></em>
with <em class="parameter"><code>mem</code></em>
.</p>
<p>If <em class="parameter"><code>length</code></em>
is -1, all memory starting from <em class="parameter"><code>idx</code></em>
will be removed and
replaced with <em class="parameter"><code>mem</code></em>
.</p>
<p><em class="parameter"><code>buffer</code></em>
should be writable.</p>
<div class="refsect3">
<a name="id-1.3.7.8.34.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>an index</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p>a length should not be 0</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mem</p></td>
<td class="parameter_description"><p> a <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-get-memory-range"></a><h3>gst_buffer_get_memory_range ()</h3>
<pre class="programlisting"><a class="link" href="GstMemory.html" title="GstMemory"><span class="returnvalue">GstMemory</span></a> *
gst_buffer_get_memory_range (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> length</code></em>);</pre>
<p>Get <em class="parameter"><code>length</code></em>
memory blocks in <em class="parameter"><code>buffer</code></em>
starting at <em class="parameter"><code>idx</code></em>
. The memory blocks will
be merged into one large <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a>.</p>
<p>If <em class="parameter"><code>length</code></em>
is -1, all memory starting from <em class="parameter"><code>idx</code></em>
is merged.</p>
<div class="refsect3">
<a name="id-1.3.7.8.35.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>an index</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p>a length</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.35.7"></a><h4>Returns</h4>
<p> a <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> that contains the merged data of <em class="parameter"><code>length</code></em>
blocks starting at <em class="parameter"><code>idx</code></em>
. Use <a class="link" href="GstMemory.html#gst-memory-unref" title="gst_memory_unref ()"><code class="function">gst_memory_unref()</code></a> after usage. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-remove-memory-range"></a><h3>gst_buffer_remove_memory_range ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_remove_memory_range (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> length</code></em>);</pre>
<p>Remove <em class="parameter"><code>length</code></em>
memory blocks in <em class="parameter"><code>buffer</code></em>
starting from <em class="parameter"><code>idx</code></em>
.</p>
<p><em class="parameter"><code>length</code></em>
can be -1, in which case all memory starting from <em class="parameter"><code>idx</code></em>
is removed.</p>
<div class="refsect3">
<a name="id-1.3.7.8.36.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>an index</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p>a length</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-find-memory"></a><h3>gst_buffer_find_memory ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_buffer_find_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><span class="type">gsize</span> offset</code></em>,
<em class="parameter"><code><span class="type">gsize</span> size</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *idx</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *length</code></em>,
<em class="parameter"><code><span class="type">gsize</span> *skip</code></em>);</pre>
<p>Find the memory blocks that span <em class="parameter"><code>size</code></em>
bytes starting from <em class="parameter"><code>offset</code></em>
in <em class="parameter"><code>buffer</code></em>
.</p>
<p>When this function returns <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, <em class="parameter"><code>idx</code></em>
will contain the index of the first
memory block where the byte for <em class="parameter"><code>offset</code></em>
can be found and <em class="parameter"><code>length</code></em>
contains the
number of memory blocks containing the <em class="parameter"><code>size</code></em>
remaining bytes. <em class="parameter"><code>skip</code></em>
contains
the number of bytes to skip in the memory block at <em class="parameter"><code>idx</code></em>
to get to the byte
for <em class="parameter"><code>offset</code></em>
.</p>
<p><em class="parameter"><code>size</code></em>
can be -1 to get all the memory blocks after <em class="parameter"><code>idx</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.7.8.37.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p>an offset</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>a size</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p> pointer to index. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p> pointer to length. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>skip</p></td>
<td class="parameter_description"><p> pointer to skip. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.37.8"></a><h4>Returns</h4>
<p> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> when <em class="parameter"><code>size</code></em>
bytes starting from <em class="parameter"><code>offset</code></em>
could be found in
<em class="parameter"><code>buffer</code></em>
and <em class="parameter"><code>idx</code></em>
, <em class="parameter"><code>length</code></em>
and <em class="parameter"><code>skip</code></em>
will be filled.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-prepend-memory"></a><h3>gst_buffer_prepend_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_prepend_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> *mem</code></em>);</pre>
<p>Prepend the memory block <em class="parameter"><code>mem</code></em>
to <em class="parameter"><code>buffer</code></em>
. This function takes
ownership of <em class="parameter"><code>mem</code></em>
and thus doesn't increase its refcount.</p>
<p>This function is identical to <a class="link" href="GstBuffer.html#gst-buffer-insert-memory" title="gst_buffer_insert_memory ()"><code class="function">gst_buffer_insert_memory()</code></a> with an index of 0.
See <a class="link" href="GstBuffer.html#gst-buffer-insert-memory" title="gst_buffer_insert_memory ()"><code class="function">gst_buffer_insert_memory()</code></a> for more details.</p>
<div class="refsect3">
<a name="id-1.3.7.8.38.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mem</p></td>
<td class="parameter_description"><p> a <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-append-memory"></a><h3>gst_buffer_append_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_append_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> *mem</code></em>);</pre>
<p>Append the memory block <em class="parameter"><code>mem</code></em>
to <em class="parameter"><code>buffer</code></em>
. This function takes
ownership of <em class="parameter"><code>mem</code></em>
and thus doesn't increase its refcount.</p>
<p>This function is identical to <a class="link" href="GstBuffer.html#gst-buffer-insert-memory" title="gst_buffer_insert_memory ()"><code class="function">gst_buffer_insert_memory()</code></a> with an index of -1.
See <a class="link" href="GstBuffer.html#gst-buffer-insert-memory" title="gst_buffer_insert_memory ()"><code class="function">gst_buffer_insert_memory()</code></a> for more details.</p>
<div class="refsect3">
<a name="id-1.3.7.8.39.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mem</p></td>
<td class="parameter_description"><p> a <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-replace-memory"></a><h3>gst_buffer_replace_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_replace_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>,
<em class="parameter"><code><a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> *mem</code></em>);</pre>
<p>Replaces the memory block at index <em class="parameter"><code>idx</code></em>
in <em class="parameter"><code>buffer</code></em>
with <em class="parameter"><code>mem</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.7.8.40.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>an index</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mem</p></td>
<td class="parameter_description"><p> a <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-replace-all-memory"></a><h3>gst_buffer_replace_all_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_replace_all_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> *mem</code></em>);</pre>
<p>Replaces all memory in <em class="parameter"><code>buffer</code></em>
with <em class="parameter"><code>mem</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.7.8.41.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mem</p></td>
<td class="parameter_description"><p> a <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-get-memory"></a><h3>gst_buffer_get_memory ()</h3>
<pre class="programlisting"><a class="link" href="GstMemory.html" title="GstMemory"><span class="returnvalue">GstMemory</span></a> *
gst_buffer_get_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>);</pre>
<p>Get the memory block at index <em class="parameter"><code>idx</code></em>
in <em class="parameter"><code>buffer</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.7.8.42.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>an index</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.42.6"></a><h4>Returns</h4>
<p> a <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> that contains the data of the
memory block at <em class="parameter"><code>idx</code></em>
. Use <a class="link" href="GstMemory.html#gst-memory-unref" title="gst_memory_unref ()"><code class="function">gst_memory_unref()</code></a> after usage. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-get-all-memory"></a><h3>gst_buffer_get_all_memory ()</h3>
<pre class="programlisting"><a class="link" href="GstMemory.html" title="GstMemory"><span class="returnvalue">GstMemory</span></a> *
gst_buffer_get_all_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>Get all the memory block in <em class="parameter"><code>buffer</code></em>
. The memory blocks will be merged
into one large <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a>.</p>
<div class="refsect3">
<a name="id-1.3.7.8.43.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.43.6"></a><h4>Returns</h4>
<p> a <a class="link" href="GstMemory.html" title="GstMemory"><span class="type">GstMemory</span></a> that contains the merged memory.
Use <a class="link" href="GstMemory.html#gst-memory-unref" title="gst_memory_unref ()"><code class="function">gst_memory_unref()</code></a> after usage. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-remove-memory"></a><h3>gst_buffer_remove_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_remove_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>);</pre>
<p>Remove the memory block in <em class="parameter"><code>b</code></em>
at index <em class="parameter"><code>i</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.7.8.44.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>an index</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-remove-all-memory"></a><h3>gst_buffer_remove_all_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_remove_all_memory (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>Remove all the memory blocks in <em class="parameter"><code>buffer</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.7.8.45.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-is-all-memory-writable"></a><h3>gst_buffer_is_all_memory_writable ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_buffer_is_all_memory_writable (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>Check if all memory blocks in <em class="parameter"><code>buffer</code></em>
are writable.</p>
<p>Note that this function does not check if <em class="parameter"><code>buffer</code></em>
is writable, use
<a class="link" href="GstBuffer.html#gst-buffer-is-writable" title="gst_buffer_is_writable()"><code class="function">gst_buffer_is_writable()</code></a> to check that if needed.</p>
<div class="refsect3">
<a name="id-1.3.7.8.46.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.7.8.46.7"></a><h4>Returns</h4>
<p> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if all memory blocks in <em class="parameter"><code>buffer</code></em>
are writable</p>
</div>
<p class="since">Since: <a class="link" href="ix04.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-is-memory-range-writable"></a><h3>gst_buffer_is_memory_range_writable ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_buffer_is_memory_range_writable (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> length</code></em>);</pre>
<p>Check if <em class="parameter"><code>length</code></em>