| /* GStreamer |
| * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> |
| * 2000 Wim Taymans <wtay@chello.be> |
| * 2005 Wim Taymans <wim@fluendo.com> |
| * |
| * gstbasesrc.h: |
| * |
| * 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., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #ifndef __GST_BASE_SRC_H__ |
| #define __GST_BASE_SRC_H__ |
| |
| #include <gst/gst.h> |
| |
| G_BEGIN_DECLS |
| |
| #define GST_TYPE_BASE_SRC (gst_base_src_get_type()) |
| #define GST_BASE_SRC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_SRC,GstBaseSrc)) |
| #define GST_BASE_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_SRC,GstBaseSrcClass)) |
| #define GST_BASE_SRC_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BASE_SRC, GstBaseSrcClass)) |
| #define GST_IS_BASE_SRC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_SRC)) |
| #define GST_IS_BASE_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_SRC)) |
| #define GST_BASE_SRC_CAST(obj) ((GstBaseSrc *)(obj)) |
| |
| /** |
| * GstBaseSrcFlags: |
| * @GST_BASE_SRC_FLAG_STARTING: has source is starting |
| * @GST_BASE_SRC_FLAG_STARTED: has source been started |
| * @GST_BASE_SRC_FLAG_LAST: offset to define more flags |
| * |
| * The #GstElement flags that a basesrc element may have. |
| */ |
| typedef enum { |
| GST_BASE_SRC_FLAG_STARTING = (GST_ELEMENT_FLAG_LAST << 0), |
| GST_BASE_SRC_FLAG_STARTED = (GST_ELEMENT_FLAG_LAST << 1), |
| /* padding */ |
| GST_BASE_SRC_FLAG_LAST = (GST_ELEMENT_FLAG_LAST << 6) |
| } GstBaseSrcFlags; |
| |
| #define GST_BASE_SRC_IS_STARTING(obj) GST_OBJECT_FLAG_IS_SET ((obj), GST_BASE_SRC_FLAG_STARTING) |
| #define GST_BASE_SRC_IS_STARTED(obj) GST_OBJECT_FLAG_IS_SET ((obj), GST_BASE_SRC_FLAG_STARTED) |
| |
| typedef struct _GstBaseSrc GstBaseSrc; |
| typedef struct _GstBaseSrcClass GstBaseSrcClass; |
| typedef struct _GstBaseSrcPrivate GstBaseSrcPrivate; |
| |
| /** |
| * GST_BASE_SRC_PAD: |
| * @obj: base source instance |
| * |
| * Gives the pointer to the #GstPad object of the element. |
| */ |
| #define GST_BASE_SRC_PAD(obj) (GST_BASE_SRC_CAST (obj)->srcpad) |
| |
| |
| /** |
| * GstBaseSrc: |
| * |
| * The opaque #GstBaseSrc data structure. |
| */ |
| struct _GstBaseSrc { |
| GstElement element; |
| |
| /*< protected >*/ |
| GstPad *srcpad; |
| |
| /* available to subclass implementations */ |
| /* MT-protected (with LIVE_LOCK) */ |
| GMutex live_lock; |
| GCond live_cond; |
| gboolean is_live; |
| gboolean live_running; |
| |
| /* MT-protected (with LOCK) */ |
| guint blocksize; /* size of buffers when operating push based */ |
| gboolean can_activate_push; /* some scheduling properties */ |
| gboolean random_access; |
| |
| GstClockID clock_id; /* for syncing */ |
| |
| /* MT-protected (with STREAM_LOCK *and* OBJECT_LOCK) */ |
| GstSegment segment; |
| /* MT-protected (with STREAM_LOCK) */ |
| gboolean need_newsegment; |
| |
| gint num_buffers; |
| gint num_buffers_left; |
| |
| gboolean typefind; |
| gboolean running; |
| GstEvent *pending_seek; |
| |
| GstBaseSrcPrivate *priv; |
| |
| /*< private >*/ |
| gpointer _gst_reserved[GST_PADDING_LARGE]; |
| }; |
| |
| /** |
| * GstBaseSrcClass: |
| * @parent_class: Element parent class |
| * @get_caps: Called to get the caps to report |
| * @negotiate: Negotiated the caps with the peer. |
| * @fixate: Called during negotiation if caps need fixating. Implement instead of |
| * setting a fixate function on the source pad. |
| * @set_caps: Notify subclass of changed output caps |
| * @decide_allocation: configure the allocation query |
| * @start: Start processing. Subclasses should open resources and prepare |
| * to produce data. Implementation should call gst_base_src_start_complete() |
| * when the operation completes, either from the current thread or any other |
| * thread that finishes the start operation asynchronously. |
| * @stop: Stop processing. Subclasses should use this to close resources. |
| * @get_times: Given a buffer, return the start and stop time when it |
| * should be pushed out. The base class will sync on the clock using |
| * these times. |
| * @get_size: Return the total size of the resource, in the format set by |
| * gst_base_src_set_format(). |
| * @is_seekable: Check if the source can seek |
| * @prepare_seek_segment: Prepare the #GstSegment that will be passed to the |
| * #GstBaseSrcClass.do_seek() vmethod for executing a seek |
| * request. Sub-classes should override this if they support seeking in |
| * formats other than the configured native format. By default, it tries to |
| * convert the seek arguments to the configured native format and prepare a |
| * segment in that format. |
| * @do_seek: Perform seeking on the resource to the indicated segment. |
| * @unlock: Unlock any pending access to the resource. Subclasses should unblock |
| * any blocked function ASAP. In particular, any create() function in |
| * progress should be unblocked and should return GST_FLOW_FLUSHING. Any |
| * future #GstBaseSrcClass.create() function call should also return |
| * GST_FLOW_FLUSHING until the #GstBaseSrcClass.unlock_stop() function has |
| * been called. |
| * @unlock_stop: Clear the previous unlock request. Subclasses should clear any |
| * state they set during #GstBaseSrcClass.unlock(), such as clearing command |
| * queues. |
| * @query: Handle a requested query. |
| * @event: Override this to implement custom event handling. |
| * @create: Ask the subclass to create a buffer with offset and size. When the |
| * subclass returns GST_FLOW_OK, it MUST return a buffer of the requested size |
| * unless fewer bytes are available because an EOS condition is near. No |
| * buffer should be returned when the return value is different from |
| * GST_FLOW_OK. A return value of GST_FLOW_EOS signifies that the end of |
| * stream is reached. The default implementation will call |
| * #GstBaseSrcClass.alloc() and then call #GstBaseSrcClass.fill(). |
| * @alloc: Ask the subclass to allocate a buffer with for offset and size. The |
| * default implementation will create a new buffer from the negotiated allocator. |
| * @fill: Ask the subclass to fill the buffer with data for offset and size. The |
| * passed buffer is guaranteed to hold the requested amount of bytes. |
| * |
| * Subclasses can override any of the available virtual methods or not, as |
| * needed. At the minimum, the @create method should be overridden to produce |
| * buffers. |
| */ |
| struct _GstBaseSrcClass { |
| GstElementClass parent_class; |
| |
| /*< public >*/ |
| /* virtual methods for subclasses */ |
| |
| /* get caps from subclass */ |
| GstCaps* (*get_caps) (GstBaseSrc *src, GstCaps *filter); |
| /* decide on caps */ |
| gboolean (*negotiate) (GstBaseSrc *src); |
| /* called if, in negotiation, caps need fixating */ |
| GstCaps * (*fixate) (GstBaseSrc *src, GstCaps *caps); |
| /* notify the subclass of new caps */ |
| gboolean (*set_caps) (GstBaseSrc *src, GstCaps *caps); |
| |
| /* setup allocation query */ |
| gboolean (*decide_allocation) (GstBaseSrc *src, GstQuery *query); |
| |
| /* start and stop processing, ideal for opening/closing the resource */ |
| gboolean (*start) (GstBaseSrc *src); |
| gboolean (*stop) (GstBaseSrc *src); |
| |
| /* given a buffer, return start and stop time when it should be pushed |
| * out. The base class will sync on the clock using these times. */ |
| void (*get_times) (GstBaseSrc *src, GstBuffer *buffer, |
| GstClockTime *start, GstClockTime *end); |
| |
| /* get the total size of the resource in the format set by |
| * gst_base_src_set_format() */ |
| gboolean (*get_size) (GstBaseSrc *src, guint64 *size); |
| |
| /* check if the resource is seekable */ |
| gboolean (*is_seekable) (GstBaseSrc *src); |
| |
| /* Prepare the segment on which to perform do_seek(), converting to the |
| * current basesrc format. */ |
| gboolean (*prepare_seek_segment) (GstBaseSrc *src, GstEvent *seek, |
| GstSegment *segment); |
| /* notify subclasses of a seek */ |
| gboolean (*do_seek) (GstBaseSrc *src, GstSegment *segment); |
| |
| /* unlock any pending access to the resource. subclasses should unlock |
| * any function ASAP. */ |
| gboolean (*unlock) (GstBaseSrc *src); |
| /* Clear any pending unlock request, as we succeeded in unlocking */ |
| gboolean (*unlock_stop) (GstBaseSrc *src); |
| |
| /* notify subclasses of a query */ |
| gboolean (*query) (GstBaseSrc *src, GstQuery *query); |
| |
| /* notify subclasses of an event */ |
| gboolean (*event) (GstBaseSrc *src, GstEvent *event); |
| |
| /* ask the subclass to create a buffer with offset and size, the default |
| * implementation will call alloc and fill. */ |
| GstFlowReturn (*create) (GstBaseSrc *src, guint64 offset, guint size, |
| GstBuffer **buf); |
| /* ask the subclass to allocate an output buffer. The default implementation |
| * will use the negotiated allocator. */ |
| GstFlowReturn (*alloc) (GstBaseSrc *src, guint64 offset, guint size, |
| GstBuffer **buf); |
| /* ask the subclass to fill the buffer with data from offset and size */ |
| GstFlowReturn (*fill) (GstBaseSrc *src, guint64 offset, guint size, |
| GstBuffer *buf); |
| |
| /*< private >*/ |
| gpointer _gst_reserved[GST_PADDING_LARGE]; |
| }; |
| |
| GType gst_base_src_get_type (void); |
| |
| GstFlowReturn gst_base_src_wait_playing (GstBaseSrc *src); |
| |
| void gst_base_src_set_live (GstBaseSrc *src, gboolean live); |
| gboolean gst_base_src_is_live (GstBaseSrc *src); |
| |
| void gst_base_src_set_format (GstBaseSrc *src, GstFormat format); |
| |
| void gst_base_src_set_dynamic_size (GstBaseSrc * src, gboolean dynamic); |
| |
| void gst_base_src_set_automatic_eos (GstBaseSrc * src, gboolean automatic_eos); |
| |
| void gst_base_src_set_async (GstBaseSrc *src, gboolean async); |
| gboolean gst_base_src_is_async (GstBaseSrc *src); |
| |
| void gst_base_src_start_complete (GstBaseSrc * basesrc, GstFlowReturn ret); |
| GstFlowReturn gst_base_src_start_wait (GstBaseSrc * basesrc); |
| |
| gboolean gst_base_src_query_latency (GstBaseSrc *src, gboolean * live, |
| GstClockTime * min_latency, |
| GstClockTime * max_latency); |
| |
| void gst_base_src_set_blocksize (GstBaseSrc *src, guint blocksize); |
| guint gst_base_src_get_blocksize (GstBaseSrc *src); |
| |
| void gst_base_src_set_do_timestamp (GstBaseSrc *src, gboolean timestamp); |
| gboolean gst_base_src_get_do_timestamp (GstBaseSrc *src); |
| |
| gboolean gst_base_src_new_seamless_segment (GstBaseSrc *src, gint64 start, gint64 stop, gint64 time); |
| |
| gboolean gst_base_src_set_caps (GstBaseSrc *src, GstCaps *caps); |
| |
| GstBufferPool * gst_base_src_get_buffer_pool (GstBaseSrc *src); |
| void gst_base_src_get_allocator (GstBaseSrc *src, |
| GstAllocator **allocator, |
| GstAllocationParams *params); |
| |
| |
| G_END_DECLS |
| |
| #endif /* __GST_BASE_SRC_H__ */ |
