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Add timestamp computation if values are exported by decoder.

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Patch by Ivan Schreter, schreter gmx net

Originally committed as revision 17574 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ivan Schreter 2009-02-24 22:19:09 +00:00 committed by Carl Eugen Hoyos
parent 4d8f830125
commit 27ca0a79c9
4 changed files with 78 additions and 3 deletions
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43
libavcodec/avcodec.h
View File

@ -30,7 +30,7 @@
#include "libavutil/avutil.h"
#define LIBAVCODEC_VERSION_MAJOR 52
#define LIBAVCODEC_VERSION_MINOR 18
#define LIBAVCODEC_VERSION_MINOR 19
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
@ -3147,6 +3147,47 @@ typedef struct AVCodecParserContext {
* subtitles are correctly displayed after seeking.
*/
int64_t convergence_duration;
// Timestamp generation support:
/**
* 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.
*/
int dts_sync_point;
/**
* 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.
*/
int dts_ref_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.
*/
int pts_dts_delta;
} AVCodecParserContext;
typedef struct AVCodecParser {

3
libavcodec/parser.c
View File

@ -75,6 +75,9 @@ AVCodecParserContext *av_parser_init(int codec_id)
s->pict_type = FF_I_TYPE;
s->key_frame = -1;
s->convergence_duration = AV_NOPTS_VALUE;
s->dts_sync_point = INT_MIN;
s->dts_ref_dts_delta = INT_MIN;
s->pts_dts_delta = INT_MIN;
return s;
}

14
libavformat/avformat.h
View File

@ -22,8 +22,8 @@
#define AVFORMAT_AVFORMAT_H
#define LIBAVFORMAT_VERSION_MAJOR 52
#define LIBAVFORMAT_VERSION_MINOR 29
#define LIBAVFORMAT_VERSION_MICRO 2
#define LIBAVFORMAT_VERSION_MINOR 30
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \
@ -494,6 +494,16 @@ typedef struct AVStream {
const uint8_t *cur_ptr;
int cur_len;
AVPacket cur_pkt;
// Timestamp generation support:
/**
* Timestamp corresponding to the last dts sync point.
*
* Initialized when AVCodecParserContext.dts_sync_point >= 0 and
* a DTS is received from the underlying container. Otherwise set to
* AV_NOPTS_VALUE by default.
*/
int64_t reference_dts;
} AVStream;
#define AV_PROGRAM_RUNNING 1

21
libavformat/utils.c
View File

@ -834,6 +834,25 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
pkt->dts += offset;
}
if (pc && pc->dts_sync_point >= 0) {
// we have synchronization info from the parser
int64_t den = st->codec->time_base.den * (int64_t) st->time_base.num;
if (den > 0) {
int64_t num = st->codec->time_base.num * (int64_t) st->time_base.den;
if (pkt->dts != AV_NOPTS_VALUE) {
// got DTS from the stream, update reference timestamp
st->reference_dts = pkt->dts - pc->dts_ref_dts_delta * num / den;
pkt->pts = pkt->dts + pc->pts_dts_delta * num / den;
} else if (st->reference_dts != AV_NOPTS_VALUE) {
// compute DTS based on reference timestamp
pkt->dts = st->reference_dts + pc->dts_ref_dts_delta * num / den;
pkt->pts = pkt->dts + pc->pts_dts_delta * num / den;
}
if (pc->dts_sync_point > 0)
st->reference_dts = pkt->dts; // new reference
}
}
/* This may be redundant, but it should not hurt. */
if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts > pkt->dts)
presentation_delayed = 1;
@ -1157,6 +1176,7 @@ static void av_read_frame_flush(AVFormatContext *s)
}
st->last_IP_pts = AV_NOPTS_VALUE;
st->cur_dts = AV_NOPTS_VALUE; /* we set the current DTS to an unspecified origin */
st->reference_dts = AV_NOPTS_VALUE;
/* fail safe */
st->cur_ptr = NULL;
st->cur_len = 0;
@ -2332,6 +2352,7 @@ AVStream *av_new_stream(AVFormatContext *s, int id)
st->last_IP_pts = AV_NOPTS_VALUE;
for(i=0; i<MAX_REORDER_DELAY+1; i++)
st->pts_buffer[i]= AV_NOPTS_VALUE;
st->reference_dts = AV_NOPTS_VALUE;
st->sample_aspect_ratio = (AVRational){0,1};