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gstreamer/gst-libs/gst/video/gstvideodecoder.h

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/* GStreamer
* Copyright (C) 2008 David Schleef <ds@schleef.org>
* Copyright (C) 2011 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>.
* Copyright (C) 2011 Nokia Corporation. All rights reserved.
* Contact: Stefan Kost <stefan.kost@nokia.com>
* Copyright (C) 2012 Collabora Ltd.
* Author : Edward Hervey <edward@collabora.com>
*
* 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_VIDEO_DECODER_H_
#define _GST_VIDEO_DECODER_H_
#include <gst/base/gstadapter.h>
#include <gst/video/gstvideoutils.h>
G_BEGIN_DECLS
#define GST_TYPE_VIDEO_DECODER \
(gst_video_decoder_get_type())
#define GST_VIDEO_DECODER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_DECODER,GstVideoDecoder))
#define GST_VIDEO_DECODER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_DECODER,GstVideoDecoderClass))
#define GST_VIDEO_DECODER_GET_CLASS(obj) \
(G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_VIDEO_DECODER,GstVideoDecoderClass))
#define GST_IS_VIDEO_DECODER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_DECODER))
#define GST_IS_VIDEO_DECODER_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_DECODER))
/**
* GST_VIDEO_DECODER_SINK_NAME:
*
* The name of the templates for the sink pad.
*/
#define GST_VIDEO_DECODER_SINK_NAME "sink"
/**
* GST_VIDEO_DECODER_SRC_NAME:
*
* The name of the templates for the source pad.
*/
#define GST_VIDEO_DECODER_SRC_NAME "src"
/**
* GST_VIDEO_DECODER_SRC_PAD:
* @obj: a #GstVideoDecoder
*
* Gives the pointer to the source #GstPad object of the element.
*/
#define GST_VIDEO_DECODER_SRC_PAD(obj) (((GstVideoDecoder *) (obj))->srcpad)
/**
* GST_VIDEO_DECODER_SINK_PAD:
* @obj: a #GstVideoDecoder
*
* Gives the pointer to the sink #GstPad object of the element.
*/
#define GST_VIDEO_DECODER_SINK_PAD(obj) (((GstVideoDecoder *) (obj))->sinkpad)
/**
* GST_VIDEO_DECODER_FLOW_NEED_DATA:
*
* Returned while parsing to indicate more data is needed.
**/
#define GST_VIDEO_DECODER_FLOW_NEED_DATA GST_FLOW_CUSTOM_SUCCESS
/**
* GST_VIDEO_DECODER_INPUT_SEGMENT:
* @obj: base decoder instance
*
* Gives the segment of the element.
*/
#define GST_VIDEO_DECODER_INPUT_SEGMENT(obj) (GST_VIDEO_DECODER_CAST (obj)->input_segment)
/**
* GST_VIDEO_DECODER_OUTPUT_SEGMENT:
* @obj: base decoder instance
*
* Gives the segment of the element.
*/
#define GST_VIDEO_DECODER_OUTPUT_SEGMENT(obj) (GST_VIDEO_DECODER_CAST (obj)->output_segment)
/**
* GST_VIDEO_DECODER_STREAM_LOCK:
* @decoder: video decoder instance
*
* Obtain a lock to protect the decoder function from concurrent access.
*/
#define GST_VIDEO_DECODER_STREAM_LOCK(decoder) g_rec_mutex_lock (&GST_VIDEO_DECODER (decoder)->stream_lock)
/**
* GST_VIDEO_DECODER_STREAM_UNLOCK:
* @decoder: video decoder instance
*
* Release the lock that protects the decoder function from concurrent access.
*/
#define GST_VIDEO_DECODER_STREAM_UNLOCK(decoder) g_rec_mutex_unlock (&GST_VIDEO_DECODER (decoder)->stream_lock)
typedef struct _GstVideoDecoder GstVideoDecoder;
typedef struct _GstVideoDecoderClass GstVideoDecoderClass;
typedef struct _GstVideoDecoderPrivate GstVideoDecoderPrivate;
/* do not use this one, use macro below */
GstFlowReturn _gst_video_decoder_error (GstVideoDecoder *dec, gint weight,
GQuark domain, gint code,
gchar *txt, gchar *debug,
const gchar *file, const gchar *function,
gint line);
/**
* GST_VIDEO_DECODER_ERROR:
* @el: the base video decoder element that generates the error
* @w: element defined weight of the error, added to error count
* @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #gstreamer-GstGError)
* @code: error code defined for that domain (see #gstreamer-GstGError)
* @text: the message to display (format string and args enclosed in
* parentheses)
* @debug: debugging information for the message (format string and args
* enclosed in parentheses)
* @ret: variable to receive return value
*
* Utility function that video decoder elements can use in case they encountered
* a data processing error that may be fatal for the current "data unit" but
* need not prevent subsequent decoding. Such errors are counted and if there
* are too many, as configured in the context's max_errors, the pipeline will
* post an error message and the application will be requested to stop further
* media processing. Otherwise, it is considered a "glitch" and only a warning
* is logged. In either case, @ret is set to the proper value to
* return to upstream/caller (indicating either GST_FLOW_ERROR or GST_FLOW_OK).
*/
#define GST_VIDEO_DECODER_ERROR(el, w, domain, code, text, debug, ret) \
G_STMT_START { \
gchar *__txt = _gst_element_error_printf text; \
gchar *__dbg = _gst_element_error_printf debug; \
GstVideoDecoder *__dec = GST_VIDEO_DECODER (el); \
ret = _gst_video_decoder_error (__dec, w, GST_ ## domain ## _ERROR, \
GST_ ## domain ## _ERROR_ ## code, __txt, __dbg, __FILE__, \
GST_FUNCTION, __LINE__); \
} G_STMT_END
/**
* GST_VIDEO_DECODER_MAX_ERRORS:
*
* Default maximum number of errors tolerated before signaling error.
*/
#define GST_VIDEO_DECODER_MAX_ERRORS 10
/**
* GstVideoDecoder:
*
* The opaque #GstVideoDecoder data structure.
*/
struct _GstVideoDecoder
{
/*< private >*/
GstElement element;
/*< protected >*/
GstPad *sinkpad;
GstPad *srcpad;
/* protects all data processing, i.e. is locked
* in the chain function, finish_frame and when
* processing serialized events */
GRecMutex stream_lock;
/* MT-protected (with STREAM_LOCK) */
GstSegment input_segment;
GstSegment output_segment;
GstVideoDecoderPrivate *priv;
/*< private >*/
void *padding[GST_PADDING_LARGE];
};
/**
* GstVideoDecoderClass:
* @open: Optional.
* Called when the element changes to GST_STATE_READY.
* Allows opening external resources.
* @close: Optional.
* Called when the element changes to GST_STATE_NULL.
* Allows closing external resources.
* @start: Optional.
* Called when the element starts processing.
* Allows opening external resources.
* @stop: Optional.
* Called when the element stops processing.
* Allows closing external resources.
* @set_format: Notifies subclass of incoming data format (caps).
* @parse: Required for non-packetized input.
* Allows chopping incoming data into manageable units (frames)
* for subsequent decoding.
* @reset: Optional.
* Allows subclass (decoder) to perform post-seek semantics reset.
* Deprecated.
* @handle_frame: Provides input data frame to subclass.
* @finish: Optional.
* Called to request subclass to dispatch any pending remaining
* data (e.g. at EOS).
* @sink_event: Optional.
* Event handler on the sink pad. This function should return
* TRUE if the event was handled and should be discarded
* (i.e. not unref'ed).
* Subclasses should chain up to the parent implementation to
* invoke the default handler.
* @src_event: Optional.
* Event handler on the source pad. This function should return
* TRUE if the event was handled and should be discarded
* (i.e. not unref'ed).
* Subclasses should chain up to the parent implementation to
* invoke the default handler.
* @negotiate: Optional.
* Negotiate with downstream and configure buffer pools, etc.
* Subclasses should chain up to the parent implementation to
* invoke the default handler.
* @decide_allocation: Optional.
* Setup the allocation parameters for allocating output
* buffers. The passed in query contains the result of the
* downstream allocation query.
* Subclasses should chain up to the parent implementation to
* invoke the default handler.
* @propose_allocation: Optional.
* Propose buffer allocation parameters for upstream elements.
* Subclasses should chain up to the parent implementation to
* invoke the default handler.
* @flush: Optional.
* Flush all remaining data from the decoder without
* pushing it downstream. Since: 1.2
* @sink_query: Optional.
* Query handler on the sink pad. This function should
* return TRUE if the query could be performed. Subclasses
* should chain up to the parent implementation to invoke the
* default handler. Since 1.4
* @src_query: Optional.
* Query handler on the source pad. This function should
* return TRUE if the query could be performed. Subclasses
* should chain up to the parent implementation to invoke the
* default handler. Since 1.4
*
* Subclasses can override any of the available virtual methods or not, as
* needed. At minimum @handle_frame needs to be overridden, and @set_format
* and likely as well. If non-packetized input is supported or expected,
* @parse needs to be overridden as well.
*/
struct _GstVideoDecoderClass
{
/*< private >*/
GstElementClass element_class;
/*< public >*/
gboolean (*open) (GstVideoDecoder *decoder);
gboolean (*close) (GstVideoDecoder *decoder);
gboolean (*start) (GstVideoDecoder *decoder);
gboolean (*stop) (GstVideoDecoder *decoder);
GstFlowReturn (*parse) (GstVideoDecoder *decoder,
GstVideoCodecFrame *frame,
GstAdapter *adapter,
gboolean at_eos);
gboolean (*set_format) (GstVideoDecoder *decoder,
GstVideoCodecState * state);
gboolean (*reset) (GstVideoDecoder *decoder,
gboolean hard);
GstFlowReturn (*finish) (GstVideoDecoder *decoder);
GstFlowReturn (*handle_frame) (GstVideoDecoder *decoder,
GstVideoCodecFrame *frame);
gboolean (*sink_event) (GstVideoDecoder *decoder,
GstEvent *event);
gboolean (*src_event) (GstVideoDecoder *decoder,
GstEvent *event);
gboolean (*negotiate) (GstVideoDecoder *decoder);
gboolean (*decide_allocation) (GstVideoDecoder *decoder, GstQuery *query);
gboolean (*propose_allocation) (GstVideoDecoder *decoder, GstQuery * query);
gboolean (*flush) (GstVideoDecoder *decoder);
gboolean (*sink_query) (GstVideoDecoder *decoder,
GstQuery *query);
gboolean (*src_query) (GstVideoDecoder *decoder,
GstQuery *query);
/*< private >*/
void *padding[GST_PADDING_LARGE-3];
};
GType gst_video_decoder_get_type (void);
/* Context parameters */
void gst_video_decoder_set_packetized (GstVideoDecoder * decoder,
gboolean packetized);
gboolean gst_video_decoder_get_packetized (GstVideoDecoder * decoder);
void gst_video_decoder_set_estimate_rate (GstVideoDecoder * dec,
gboolean enabled);
gint gst_video_decoder_get_estimate_rate (GstVideoDecoder * dec);
void gst_video_decoder_set_max_errors (GstVideoDecoder * dec,
gint num);
gint gst_video_decoder_get_max_errors (GstVideoDecoder * dec);
void gst_video_decoder_set_needs_format (GstVideoDecoder * dec,
gboolean enabled);
gboolean gst_video_decoder_get_needs_format (GstVideoDecoder * dec);
void gst_video_decoder_set_latency (GstVideoDecoder *decoder,
GstClockTime min_latency,
GstClockTime max_latency);
void gst_video_decoder_get_latency (GstVideoDecoder *decoder,
GstClockTime *min_latency,
GstClockTime *max_latency);
void gst_video_decoder_get_allocator (GstVideoDecoder *decoder,
GstAllocator **allocator,
GstAllocationParams *params);
GstBufferPool *gst_video_decoder_get_buffer_pool (GstVideoDecoder *decoder);
/* Object methods */
GstVideoCodecFrame *gst_video_decoder_get_frame (GstVideoDecoder *decoder,
int frame_number);
GstVideoCodecFrame *gst_video_decoder_get_oldest_frame (GstVideoDecoder *decoder);
GList * gst_video_decoder_get_frames (GstVideoDecoder *decoder);
/* Parsing related methods */
void gst_video_decoder_add_to_frame (GstVideoDecoder *decoder,
int n_bytes);
GstFlowReturn gst_video_decoder_have_frame (GstVideoDecoder *decoder);
GstBuffer *gst_video_decoder_allocate_output_buffer (GstVideoDecoder * decoder);
GstFlowReturn gst_video_decoder_allocate_output_frame (GstVideoDecoder *decoder,
GstVideoCodecFrame *frame);
GstVideoCodecState *gst_video_decoder_set_output_state (GstVideoDecoder *decoder,
GstVideoFormat fmt, guint width, guint height,
GstVideoCodecState *reference);
GstVideoCodecState *gst_video_decoder_get_output_state (GstVideoDecoder *decoder);
gboolean gst_video_decoder_negotiate (GstVideoDecoder * decoder);
GstClockTimeDiff gst_video_decoder_get_max_decode_time (GstVideoDecoder *decoder,
GstVideoCodecFrame *frame);
gdouble gst_video_decoder_get_qos_proportion (GstVideoDecoder * decoder);
GstFlowReturn gst_video_decoder_finish_frame (GstVideoDecoder *decoder,
GstVideoCodecFrame *frame);
GstFlowReturn gst_video_decoder_drop_frame (GstVideoDecoder *dec,
GstVideoCodecFrame *frame);
void gst_video_decoder_release_frame (GstVideoDecoder * dec,
GstVideoCodecFrame * frame);
void gst_video_decoder_merge_tags (GstVideoDecoder *dec,
const GstTagList *tags,
GstTagMergeMode mode);
G_END_DECLS
#endif
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