gstreamer/gst-libs/gst/video/gstvideoutils.h
Sebastian Dröge 9002471c93 video: Document buffer ownership of the GstVideoCodecFrame more explicit
And also the implications of calling the finish() functions.
2012-07-05 14:29:42 +02:00

272 lines
9.4 KiB
C

/* GStreamer
* Copyright (C) 2008 David Schleef <ds@schleef.org>
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef _GST_VIDEO_UTILS_H_
#define _GST_VIDEO_UTILS_H_
#include <gst/gst.h>
#include <gst/video/video.h>
G_BEGIN_DECLS
#define GST_TYPE_VIDEO_CODEC_STATE \
(gst_video_codec_state_get_type())
#define GST_TYPE_VIDEO_CODEC_FRAME \
(gst_video_codec_frame_get_type())
typedef struct _GstVideoCodecState GstVideoCodecState;
typedef struct _GstVideoCodecFrame GstVideoCodecFrame;
/**
* GstVideoCodecState:
* @info: The #GstVideoInfo describing the stream
* @caps: The #GstCaps
* @codec_data: (optional) a #GstBuffer corresponding to the
* 'codec_data' field of a stream.
*
* Structure representing the state of an incoming or outgoing video
* stream for encoders and decoders.
*
* Decoders and encoders will receive such a state through their
* respective @set_format vmethods.
*
* Decoders and encoders can set the downstream state, by using the
* @gst_video_decoder_set_output_state() or
* @gst_video_encoder_set_output_state() methods.
*/
struct _GstVideoCodecState
{
/*< private >*/
gint ref_count;
/*< public >*/
GstVideoInfo info;
GstCaps *caps;
GstBuffer *codec_data;
/*< private >*/
void *padding[GST_PADDING_LARGE];
};
/**
* GstVideoCodecFrameFlags:
* @GST_VIDEO_CODEC_FRAME_FLAG_DECODE_ONLY: is the frame only meant to be decoded
* @GST_VIDEO_CODEC_FRAME_FLAG_SYNC_POINT: is the frame a synchronization point (keyframe)
* @GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME: should the output frame be made a keyframe
* @GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME_HEADERS: should the encoder output stream headers
*
* Flags for #GstVideoCodecFrame
*/
typedef enum
{
GST_VIDEO_CODEC_FRAME_FLAG_DECODE_ONLY = (1<<0),
GST_VIDEO_CODEC_FRAME_FLAG_SYNC_POINT = (1<<1),
GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME = (1<<2),
GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME_HEADERS = (1<<3)
} GstVideoCodecFrameFlags;
/**
* GST_VIDEO_CODEC_FRAME_FLAGS:
* @frame: a #GstVideoCodecFrame
*
* The entire set of flags for the @frame
*/
#define GST_VIDEO_CODEC_FRAME_FLAGS(frame) ((frame)->flags)
/**
* GST_VIDEO_CODEC_FRAME_FLAG_IS_SET:
* @frame: a #GstVideoCodecFrame
* @flag: a flag to check for
*
* Checks whether the given @flag is set
*/
#define GST_VIDEO_CODEC_FRAME_FLAG_IS_SET(frame,flag) !!(GST_VIDEO_CODEC_FRAME_FLAGS(frame) & (flag))
/**
* GST_VIDEO_CODEC_FRAME_FLAG_SET:
* @frame: a #GstVideoCodecFrame
* @flag: Flag to set, can be any number of bits in guint32.
*
* This macro sets the given bits
*/
#define GST_VIDEO_CODEC_FRAME_FLAG_SET(frame,flag) (GST_VIDEO_CODEC_FRAME_FLAGS(frame) |= (flag))
/**
* GST_VIDEO_CODEC_FRAME_FLAG_UNSET:
* @frame: a #GstVideoCodecFrame
* @flag: Flag to unset
*
* This macro usets the given bits.
*/
#define GST_VIDEO_CODEC_FRAME_FLAG_UNSET(frame,flag) (GST_VIDEO_CODEC_FRAME_FLAGS(frame) &= ~(flag))
/**
* GST_VIDEO_CODEC_FRAME_IS_DECODE_ONLY:
* @frame: a #GstVideoCodecFrame
*
* Tests if the buffer should only be decoded but not sent downstream.
*/
#define GST_VIDEO_CODEC_FRAME_IS_DECODE_ONLY(frame) (GST_VIDEO_CODEC_FRAME_FLAG_IS_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_DECODE_ONLY))
/**
* GST_VIDEO_CODEC_FRAME_SET_DECODE_ONLY:
* @frame: a #GstVideoCodecFrame
*
* Sets the buffer to not be sent downstream.
*
* Decoder implementation can use this if they have frames that
* are not meant to be displayed.
*
* Encoder implementation can safely ignore this field.
*/
#define GST_VIDEO_CODEC_FRAME_SET_DECODE_ONLY(frame) (GST_VIDEO_CODEC_FRAME_FLAG_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_DECODE_ONLY))
/**
* GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT:
* @frame: a #GstVideoCodecFrame
*
* Tests if the frame is a synchronization point (like a keyframe).
*
* Decoder implementations can use this to detect keyframes.
*/
#define GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT(frame) (GST_VIDEO_CODEC_FRAME_FLAG_IS_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_SYNC_POINT))
/**
* GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT:
* @frame: a #GstVideoCodecFrame
*
* Sets the frame to be a synchronization point (like a keyframe).
*
* Encoder implementations should set this accordingly.
*
* Decoder implementing parsing features should set this when they
* detect such a synchronization point.
*/
#define GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT(frame) (GST_VIDEO_CODEC_FRAME_FLAG_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_SYNC_POINT))
#define GST_VIDEO_CODEC_FRAME_UNSET_SYNC_POINT(frame) (GST_VIDEO_CODEC_FRAME_FLAG_UNSET(frame, GST_VIDEO_CODEC_FRAME_FLAG_SYNC_POINT))
/**
* GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME:
* @frame: a #GstVideoCodecFrame
*
* Tests if the frame must be encoded as a keyframe. Applies only to
* frames provided to encoders. Decoders can safely ignore this field.
*/
#define GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME(frame) (GST_VIDEO_CODEC_FRAME_FLAG_IS_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME))
#define GST_VIDEO_CODEC_FRAME_SET_FORCE_KEYFRAME(frame) (GST_VIDEO_CODEC_FRAME_FLAG_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME))
#define GST_VIDEO_CODEC_FRAME_UNSET_FORCE_KEYFRAME(frame) (GST_VIDEO_CODEC_FRAME_FLAG_UNSET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME))
/**
* GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME_HEADERS:
* @frame: a #GstVideoCodecFrame
*
* Tests if encoder should output stream headers before outputting the
* resulting encoded buffer for the given frame.
*
* Applies only to frames provided to encoders. Decoders can safely
* ignore this field.
*/
#define GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME_HEADERS(frame) (GST_VIDEO_CODEC_FRAME_FLAG_IS_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME_HEADERS))
#define GST_VIDEO_CODEC_FRAME_SET_FORCE_KEYFRAME_HEADERS(frame) (GST_VIDEO_CODEC_FRAME_FLAG_SET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME_HEADERS))
#define GST_VIDEO_CODEC_FRAME_UNSET_FORCE_KEYFRAME_HEADERS(frame) (GST_VIDEO_CODEC_FRAME_FLAG_UNSET(frame, GST_VIDEO_CODEC_FRAME_FLAG_FORCE_KEYFRAME_HEADERS))
/**
* GstVideoCodecFrame:
* @pts: Presentation timestamp
* @dts: Decoding timestamp
* @duration: Duration of the frame
* @system_frame_number: Unique identifier for the frame. Use this if you need
* to get hold of the frame later (like when data is being decoded).
* Typical usage in decoders is to set this on the opaque value provided
* to the library and get back the frame using gst_video_decoder_get_frame()
* @distance_from_sync: Distance in frames from the last synchronization point.
* @input_buffer: the input #GstBuffer that created this frame. The buffer is owned
* by the frame and references to the frame instead of the buffer should
* @output_buffer: the output #GstBuffer. Implementations should set this either
* directly, or by using the @gst_video_decoder_alloc_output_frame() or
* @gst_video_decoder_alloc_output_buffer() methods. The buffer is owned
* by the frame and references to the frame instead of the buffer should
* be kept.
* @deadline: Running time when the frame will be used.
* @events: Events that will be pushed downstream before this frame is pushed.
*
* A #GstVideoCodecFrame represents a video frame both in raw and
* encoded form.
*/
struct _GstVideoCodecFrame
{
/*< private >*/
gint ref_count;
guint32 flags;
/*< public >*/
gint system_frame_number; /* ED */
gint decode_frame_number; /* ED */
gint presentation_frame_number; /* ED */
GstClockTime dts; /* ED */
GstClockTime pts; /* ED */
GstClockTime duration; /* ED */
int distance_from_sync; /* ED */
GstBuffer *input_buffer; /* ED */
GstBuffer *output_buffer; /* ED */
GstClockTime deadline; /* D */
/*< private >*/
/* Events that should be pushed downstream *before*
* the next output_buffer */
GList *events; /* ED */
gpointer user_data;
GDestroyNotify user_data_destroy_notify;
void *padding[GST_PADDING_LARGE];
};
/* GstVideoCodecState */
GType gst_video_codec_state_get_type (void);
GstVideoCodecState *gst_video_codec_state_ref (GstVideoCodecState * state);
void gst_video_codec_state_unref (GstVideoCodecState * state);
/* GstVideoCodecFrame */
GType gst_video_codec_frame_get_type (void);
GstVideoCodecFrame *gst_video_codec_frame_ref (GstVideoCodecFrame * frame);
void gst_video_codec_frame_unref (GstVideoCodecFrame * frame);
void gst_video_codec_frame_set_user_data (GstVideoCodecFrame *frame,
gpointer user_data,
GDestroyNotify notify);
gpointer gst_video_codec_frame_get_user_data (GstVideoCodecFrame *frame);
G_END_DECLS
#endif