AVCodecParserContext Struct Reference

#include <avcodec.h>

Data Fields

void * priv_data

struct AVCodecParser * parser

int64_t frame_offset

int64_t cur_offset

int64_t next_frame_offset

int pict_type

int repeat_pict

This field is used for proper frame duration computation in lavf.

int64_t pts

int64_t dts

int64_t last_pts

int64_t last_dts

int fetch_timestamp

int cur_frame_start_index

int64_t cur_frame_offset [AV_PARSER_PTS_NB]

int64_t cur_frame_pts [AV_PARSER_PTS_NB]

int64_t cur_frame_dts [AV_PARSER_PTS_NB]

int flags

int64_t offset

byte offset from starting packet start

int64_t cur_frame_end [AV_PARSER_PTS_NB]

int key_frame

int64_t convergence_duration

Time difference in stream time base units from the pts of this packet to the point at which the output from the decoder has converged independent from the availability of previous frames.

int dts_sync_point

Synchronization point for start of timestamp generation.

int dts_ref_dts_delta

Offset of the current timestamp against last timestamp sync point in units of AVCodecContext.time_base.

int pts_dts_delta

Presentation delay of current frame in units of AVCodecContext.time_base.

int64_t cur_frame_pos [AV_PARSER_PTS_NB]

Position of the packet in file.

int64_t pos

Byte position of currently parsed frame in stream.

int64_t last_pos

Previous frame byte position.

Detailed Description

Definition at line 3780 of file avcodec.h.

Field Documentation

int64_t AVCodecParserContext::convergence_duration

Time difference in stream time base units from the pts of this packet to the point at which the output from the decoder has converged independent from the availability of previous frames.

That is, the frames are virtually identical no matter if decoding started from the very first frame or from this keyframe. Is AV_NOPTS_VALUE if unknown. This field is not the display duration of the current frame. This field has no meaning if the packet does not have AV_PKT_FLAG_KEY set.

The purpose of this field is to allow seeking in streams that have no keyframes in the conventional sense. It corresponds to the recovery point SEI in H.264 and match_time_delta in NUT. It is also essential for some types of subtitle streams to ensure that all subtitles are correctly displayed after seeking.

Definition at line 3847 of file avcodec.h.

Referenced by av_parser_init(), and compute_pkt_fields().

int64_t AVCodecParserContext::cur_frame_dts[AV_PARSER_PTS_NB]

Definition at line 3811 of file avcodec.h.

Referenced by av_parser_parse2(), and ff_fetch_timestamp().

int64_t AVCodecParserContext::cur_frame_end[AV_PARSER_PTS_NB]

Definition at line 3820 of file avcodec.h.

Referenced by av_parser_parse2(), and ff_fetch_timestamp().

int64_t AVCodecParserContext::cur_frame_offset[AV_PARSER_PTS_NB]

Definition at line 3809 of file avcodec.h.

Referenced by av_parser_parse2(), and ff_fetch_timestamp().

int64_t AVCodecParserContext::cur_frame_pos[AV_PARSER_PTS_NB]

Position of the packet in file.

Analogous to cur_frame_pts/dts

Definition at line 3895 of file avcodec.h.

Referenced by av_parser_parse2(), and ff_fetch_timestamp().

int64_t AVCodecParserContext::cur_frame_pts[AV_PARSER_PTS_NB]

Definition at line 3810 of file avcodec.h.

Referenced by av_parser_parse2(), dvbsub_parse(), and ff_fetch_timestamp().

int AVCodecParserContext::cur_frame_start_index

Definition at line 3808 of file avcodec.h.

Referenced by av_parser_parse2(), and dvbsub_parse().

int64_t AVCodecParserContext::cur_offset

Definition at line 3784 of file avcodec.h.

Referenced by av_parser_parse2(), and ff_fetch_timestamp().

int64_t AVCodecParserContext::dts

Definition at line 3800 of file avcodec.h.

Referenced by av_parser_parse2(), av_read_frame_internal(), dirac_combine_frame(), and ff_fetch_timestamp().

int AVCodecParserContext::dts_ref_dts_delta

Offset of the current timestamp against last timestamp sync point in units of AVCodecContext.time_base.

Set to INT_MIN when dts_sync_point unused. Otherwise, it must contain a valid timestamp offset.

Note that the timestamp of sync point has usually a nonzero dts_ref_dts_delta, which refers to the previous sync point. Offset of the next frame after timestamp sync point will be usually 1.

For example, this corresponds to H.264 cpb_removal_delay.

Definition at line 3874 of file avcodec.h.

Referenced by av_parser_init(), compute_pkt_fields(), and h264_parse().

int AVCodecParserContext::dts_sync_point

Synchronization point for start of timestamp generation.

Set to >0 for sync point, 0 for no sync point and <0 for undefined (default).

For example, this corresponds to presence of H.264 buffering period SEI message.

Definition at line 3859 of file avcodec.h.

Referenced by av_parser_init(), compute_pkt_fields(), and h264_parse().

int AVCodecParserContext::fetch_timestamp

Definition at line 3805 of file avcodec.h.

Referenced by av_parser_init(), av_parser_parse2(), and dvbsub_parse().

int AVCodecParserContext::flags

Definition at line 3813 of file avcodec.h.

Referenced by av_parser_parse2(), av_read_frame_internal(), avformat_find_stream_info(), cavsvideo_parse(), dca_parse(), dirac_parse(), dnxhd_parse(), flac_parse(), h261_parse(), h263_parse(), h264_parse(), init(), jpeg_parse(), latm_parse(), mpeg4video_parse(), mpegvideo_parse(), and vc1_parse().

int64_t AVCodecParserContext::frame_offset

Definition at line 3783 of file avcodec.h.

Referenced by av_parser_parse2(), av_read_frame_internal(), and ff_fetch_timestamp().

int AVCodecParserContext::key_frame

Set by parser to 1 for key frames and 0 for non-key frames. It is initialized to -1, so if the parser doesn't set this flag, old-style fallback using AV_PICTURE_TYPE_I picture type as key frames will be used.

Definition at line 3828 of file avcodec.h.

Referenced by av_parser_init(), compute_pkt_fields(), and parse_nal_units().

int64_t AVCodecParserContext::last_dts

Definition at line 3804 of file avcodec.h.

Referenced by av_parser_parse2(), and dirac_combine_frame().

int64_t AVCodecParserContext::last_pos

Previous frame byte position.

Definition at line 3905 of file avcodec.h.

Referenced by av_parser_parse2().

int64_t AVCodecParserContext::last_pts

Definition at line 3803 of file avcodec.h.

Referenced by av_parser_parse2(), dirac_combine_frame(), and dvbsub_parse().

int64_t AVCodecParserContext::next_frame_offset

Definition at line 3786 of file avcodec.h.

Referenced by av_parser_parse2(), and ff_fetch_timestamp().

int64_t AVCodecParserContext::offset

byte offset from starting packet start

Definition at line 3819 of file avcodec.h.

Referenced by compute_pkt_fields(), and ff_fetch_timestamp().

struct AVCodecParser* AVCodecParserContext::parser [read]

Definition at line 3782 of file avcodec.h.

Referenced by av_parser_change(), av_parser_close(), av_parser_init(), av_parser_parse2(), avformat_find_stream_info(), and remove_extradata().

int AVCodecParserContext::pict_type

Definition at line 3788 of file avcodec.h.

Referenced by av_mpeg4_decode_header(), av_parser_init(), compute_pkt_fields(), dirac_combine_frame(), mpegvideo_extract_headers(), mpegvideo_parse(), parse(), parse_nal_units(), and vc1_extract_headers().

int64_t AVCodecParserContext::pos

Byte position of currently parsed frame in stream.

Definition at line 3900 of file avcodec.h.

Referenced by av_parser_parse2(), av_read_frame_internal(), and ff_fetch_timestamp().

void* AVCodecParserContext::priv_data

int64_t AVCodecParserContext::pts

Definition at line 3799 of file avcodec.h.

Referenced by av_parser_parse2(), av_read_frame_internal(), dirac_combine_frame(), dvbsub_parse(), and ff_fetch_timestamp().

int AVCodecParserContext::pts_dts_delta

Presentation delay of current frame in units of AVCodecContext.time_base.

Set to INT_MIN when dts_sync_point unused. Otherwise, it must contain valid non-negative timestamp delta (presentation time of a frame must not lie in the past).

This delay represents the difference between decoding and presentation time of the frame.

For example, this corresponds to H.264 dpb_output_delay.

Definition at line 3888 of file avcodec.h.

Referenced by av_parser_init(), compute_pkt_fields(), and h264_parse().

int AVCodecParserContext::repeat_pict

This field is used for proper frame duration computation in lavf.

It signals, how much longer the frame duration of the current frame is compared to normal frame duration.

frame_duration = (1 + repeat_pict) * time_base

It is used by codecs like H.264 to display telecined material.

Definition at line 3798 of file avcodec.h.

Referenced by compute_frame_duration(), mpegvideo_extract_headers(), mpegvideo_parse(), output_packet(), and parse_nal_units().

The documentation for this struct was generated from the following file:

libavcodec/avcodec.h


Data Fields
void *	priv_data
struct AVCodecParser *	parser
int64_t	frame_offset
int64_t	cur_offset
int64_t	next_frame_offset
int	pict_type
int	repeat_pict
	This field is used for proper frame duration computation in lavf.
int64_t	pts
int64_t	dts
int64_t	last_pts
int64_t	last_dts
int	fetch_timestamp
int	cur_frame_start_index
int64_t	cur_frame_offset [AV_PARSER_PTS_NB]
int64_t	cur_frame_pts [AV_PARSER_PTS_NB]
int64_t	cur_frame_dts [AV_PARSER_PTS_NB]
int	flags
int64_t	offset
	byte offset from starting packet start
int64_t	cur_frame_end [AV_PARSER_PTS_NB]
int	key_frame
int64_t	convergence_duration
	Time difference in stream time base units from the pts of this packet to the point at which the output from the decoder has converged independent from the availability of previous frames.
int	dts_sync_point
	Synchronization point for start of timestamp generation.
int	dts_ref_dts_delta
	Offset of the current timestamp against last timestamp sync point in units of AVCodecContext.time_base.
int	pts_dts_delta
	Presentation delay of current frame in units of AVCodecContext.time_base.
int64_t	cur_frame_pos [AV_PARSER_PTS_NB]
	Position of the packet in file.
int64_t	pos
	Byte position of currently parsed frame in stream.
int64_t	last_pos
	Previous frame byte position.