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avcodec: add duration field to AVCodecParserContext 

This will allow parsers to export the duration of the current frame being
output, if known, instead of using AVCodecContext.frame_size.
This commit is contained in:
Justin Ruggles 2012-01-12 20:03:17 -05:00
parent 0b42a9388c
commit e9cda85351
3 changed files with 24 additions and 0 deletions
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3
doc/APIchanges
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@ -13,6 +13,9 @@ libavutil: 2011-04-18
API changes, most recent first:
2012-xx-xx - xxxxxxx - lavc 54.x.x
Add duration field to AVCodecParserContext
2012-02-xx - xxxxxxx - lavu 51.23.1 - mathematics.h
Add av_rescale_q_rnd()

7
libavcodec/avcodec.h
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@ -3994,6 +3994,13 @@ typedef struct AVCodecParserContext {
* Previous frame byte position.
*/
int64_t last_pos;
/**
* Duration of the current frame.
* For audio, this is in units of 1 / AVCodecContext.sample_rate.
* For all other types, this is in units of AVCodecContext.time_base.
*/
int duration;
} AVCodecParserContext;
typedef struct AVCodecParser {

14
libavformat/utils.c
View File

@ -1039,6 +1039,20 @@ static int read_frame_internal(AVFormatContext *s, AVPacket *pkt)
if (pkt->size) {
got_packet:
pkt->duration = 0;
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
if (st->codec->sample_rate > 0) {
pkt->duration = av_rescale_q_rnd(st->parser->duration,
(AVRational){ 1, st->codec->sample_rate },
st->time_base,
AV_ROUND_DOWN);
}
} else if (st->codec->time_base.num != 0 &&
st->codec->time_base.den != 0) {
pkt->duration = av_rescale_q_rnd(st->parser->duration,
st->codec->time_base,
st->time_base,
AV_ROUND_DOWN);
}
pkt->stream_index = st->index;
pkt->pts = st->parser->pts;
pkt->dts = st->parser->dts;