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timestamps generation improvement when parsing avi

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patch by Joakim \ elupus chez ecce dot se /
original thread:
date: 03/19/2007 01:47 AM
subject: [Ffmpeg-devel] [RFC] Improvement for the odd timestamp generation when parser is in use.

Originally committed as revision 8725 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Joakim Plate 2007-04-13 07:50:04 +00:00 committed by Benoit Fouet
parent 946d3b12a1
commit a74008a4c3
5 changed files with 25 additions and 7 deletions
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7
libavcodec/avcodec.h
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@ -37,8 +37,8 @@ extern "C" {
#define AV_STRINGIFY(s) AV_TOSTRING(s)
#define AV_TOSTRING(s) #s
#define LIBAVCODEC_VERSION_INT ((51<<16)+(40<<8)+2)
#define LIBAVCODEC_VERSION 51.40.2
#define LIBAVCODEC_VERSION_INT ((51<<16)+(40<<8)+3)
#define LIBAVCODEC_VERSION 51.40.3
#define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
#define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
@ -2940,6 +2940,9 @@ typedef struct AVCodecParserContext {
int flags;
#define PARSER_FLAG_COMPLETE_FRAMES 0x0001
int64_t offset; ///< byte offset from starting packet start
int64_t last_offset;
} AVCodecParserContext;
typedef struct AVCodecParser {

3
libavcodec/parser.c
View File

@ -124,6 +124,7 @@ int av_parser_parse(AVCodecParserContext *s,
s->fetch_timestamp=0;
s->last_pts = pts;
s->last_dts = dts;
s->last_offset = 0;
s->cur_frame_pts[k] =
s->cur_frame_dts[k] = AV_NOPTS_VALUE;
}
@ -138,6 +139,7 @@ int av_parser_parse(AVCodecParserContext *s,
s->frame_offset = s->last_frame_offset;
s->pts = s->last_pts;
s->dts = s->last_dts;
s->offset = s->last_offset;
/* offset of the next frame */
s->last_frame_offset = s->cur_offset + index;
@ -156,6 +158,7 @@ int av_parser_parse(AVCodecParserContext *s,
s->last_pts = s->cur_frame_pts[k];
s->last_dts = s->cur_frame_dts[k];
s->last_offset = s->last_frame_offset - s->cur_frame_offset[k];
/* some parsers tell us the packet size even before seeing the first byte of the next packet,
so the next pts/dts is in the next chunk */

7
libavformat/avformat.h
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@ -25,8 +25,8 @@
extern "C" {
#endif
#define LIBAVFORMAT_VERSION_INT ((51<<16)+(12<<8)+0)
#define LIBAVFORMAT_VERSION 51.12.0
#define LIBAVFORMAT_VERSION_INT ((51<<16)+(12<<8)+1)
#define LIBAVFORMAT_VERSION 51.12.1
#define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
#define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
@ -309,7 +309,8 @@ typedef struct AVStream {
char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
/* av_read_frame() support */
int need_parsing; ///< 1->full parsing needed, 2->only parse headers dont repack
#define AVSTREAM_PARSE_TIMESTAMPS 3 /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
int need_parsing; ///< 1->full parsing needed, 2->only parse headers dont repack, 3->full parsing and interpolate timestamps
struct AVCodecParserContext *parser;
int64_t cur_dts;

4
libavformat/avidec.c
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@ -452,8 +452,8 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
url_fskip(pb, 1);
/* Force parsing as several audio frames can be in
* one packet. */
st->need_parsing = 1;
* one packet and timestamps refer to packet start*/
st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
/* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
st->need_parsing = 0;

11
libavformat/utils.c
View File

@ -584,6 +584,7 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
AVCodecParserContext *pc, AVPacket *pkt)
{
int num, den, presentation_delayed, delay, i;
int64_t offset;
/* handle wrapping */
if(st->cur_dts != AV_NOPTS_VALUE){
if(pkt->pts != AV_NOPTS_VALUE)
@ -599,6 +600,16 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
}
}
/* correct timestamps with byte offset if demuxers only have timestamps on packet boundaries */
if(pc && st->need_parsing == AVSTREAM_PARSE_TIMESTAMPS && pkt->size){
/* this will estimate bitrate based on this frame's duration and size */
offset = av_rescale(pc->offset, pkt->duration, pkt->size);
if(pkt->pts != AV_NOPTS_VALUE)
pkt->pts += offset;
if(pkt->dts != AV_NOPTS_VALUE)
pkt->dts += offset;
}
if(is_intra_only(st->codec))
pkt->flags |= PKT_FLAG_KEY;