| /* GStreamer |
| * Copyright (C) 2011 Wim Taymans <wim.taymans@gmail.com> |
| * |
| * gstmeta.c: metadata operations |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| */ |
| |
| /** |
| * SECTION:gstmeta |
| * @short_description: Buffer metadata |
| * |
| * Last reviewed on December 17th, 2009 (0.10.26) |
| */ |
| #include "gst_private.h" |
| |
| #include "gstbuffer.h" |
| #include "gstmeta.h" |
| #include "gstinfo.h" |
| #include "gstutils.h" |
| |
| static GHashTable *metainfo = NULL; |
| static GStaticRWLock lock = G_STATIC_RW_LOCK_INIT; |
| |
| void |
| _priv_gst_meta_initialize (void) |
| { |
| metainfo = g_hash_table_new (g_str_hash, g_str_equal); |
| } |
| |
| /** |
| * gst_meta_register_info: |
| * @info: a #GstMetaInfo |
| * |
| * Register a #GstMetaInfo. The same @info can be retrieved later with |
| * gst_meta_get_info() by using @impl as the key. |
| * |
| * Returns: a #GstMetaInfo that can be used to access metadata. |
| */ |
| |
| const GstMetaInfo * |
| gst_meta_register (const gchar * api, const gchar * impl, gsize size, |
| GstMetaInitFunction init_func, GstMetaFreeFunction free_func, |
| GstMetaCopyFunction copy_func, GstMetaTransformFunction transform_func) |
| { |
| GstMetaInfo *info; |
| |
| g_return_val_if_fail (api != NULL, NULL); |
| g_return_val_if_fail (impl != NULL, NULL); |
| g_return_val_if_fail (size != 0, NULL); |
| |
| info = g_slice_new (GstMetaInfo); |
| info->api = g_quark_from_string (api); |
| info->type = g_pointer_type_register_static (impl); |
| info->size = size; |
| info->init_func = init_func; |
| info->free_func = free_func; |
| info->copy_func = copy_func; |
| info->transform_func = transform_func; |
| |
| GST_DEBUG ("register \"%s\" implementing \"%s\" of size %" G_GSIZE_FORMAT, |
| api, impl, size); |
| |
| g_static_rw_lock_writer_lock (&lock); |
| g_hash_table_insert (metainfo, (gpointer) impl, (gpointer) info); |
| g_static_rw_lock_writer_unlock (&lock); |
| |
| return info; |
| } |
| |
| /** |
| * gst_meta_get_info: |
| * @impl: the name |
| * |
| * Lookup a previously registered meta info structure by its implementor name |
| * @impl. |
| * |
| * Returns: a #GstMetaInfo with @impl or #NULL when no such metainfo |
| * exists. |
| */ |
| const GstMetaInfo * |
| gst_meta_get_info (const gchar * impl) |
| { |
| GstMetaInfo *info; |
| |
| g_return_val_if_fail (impl != NULL, NULL); |
| |
| g_static_rw_lock_reader_lock (&lock); |
| info = g_hash_table_lookup (metainfo, impl); |
| g_static_rw_lock_reader_unlock (&lock); |
| |
| return info; |
| } |
| |
| /* Timing metadata */ |
| static void |
| meta_timing_copy (GstBuffer * copybuf, GstMetaTiming * meta, |
| GstBuffer * buffer, gsize offset, gsize size) |
| { |
| GstMetaTiming *timing; |
| |
| GST_DEBUG ("trans called from buffer %p to %p, meta %p," |
| "offset %" G_GSIZE_FORMAT ", size %" G_GSIZE_FORMAT, buffer, |
| copybuf, meta, offset, size); |
| |
| timing = gst_buffer_add_meta_timing (copybuf); |
| if (offset == 0) { |
| /* same offset, copy timestamps */ |
| timing->pts = meta->pts; |
| timing->dts = meta->dts; |
| if (size == gst_buffer_get_size (buffer)) { |
| /* same size, copy duration */ |
| timing->duration = meta->duration; |
| } else { |
| /* else clear */ |
| timing->duration = GST_CLOCK_TIME_NONE; |
| } |
| } else { |
| timing->pts = -1; |
| timing->dts = -1; |
| timing->duration = -1; |
| } |
| timing->clock_rate = meta->clock_rate; |
| } |
| |
| const GstMetaInfo * |
| gst_meta_timing_get_info (void) |
| { |
| static const GstMetaInfo *meta_info = NULL; |
| |
| if (meta_info == NULL) { |
| meta_info = gst_meta_register ("GstMetaTiming", "GstMetaTiming", |
| sizeof (GstMetaTiming), |
| (GstMetaInitFunction) NULL, |
| (GstMetaFreeFunction) NULL, |
| (GstMetaCopyFunction) meta_timing_copy, |
| (GstMetaTransformFunction) NULL); |
| } |
| return meta_info; |
| } |