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pts and dts support in parser API

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Originally committed as revision 2619 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
2003-12-16 11:17:06 +00:00
parent ac3d5cac7b
commit b84f2a3533
2 changed files with 50 additions and 6 deletions
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37
libavcodec/parser.c
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@@ -68,23 +68,56 @@ AVCodecParserContext *av_parser_init(int codec_id)
int av_parser_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
const uint8_t *buf, int buf_size,
int64_t pts, int64_t dts)
{
int index;
int index, i, k;
uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
if (buf_size == 0) {
/* padding is always necessary even if EOF, so we add it here */
memset(dummy_buf, 0, sizeof(dummy_buf));
buf = dummy_buf;
} else {
/* add a new packet descriptor */
k = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
s->cur_frame_start_index = k;
s->cur_frame_offset[k] = s->cur_offset;
s->cur_frame_pts[k] = pts;
s->cur_frame_dts[k] = dts;
/* fill first PTS/DTS */
if (s->cur_offset == 0) {
s->last_pts = pts;
s->last_dts = dts;
}
}
/* WARNING: the returned index can be negative */
index = s->parser->parser_parse(s, avctx, poutbuf, poutbuf_size, buf, buf_size);
/* update the file pointer */
if (*poutbuf_size) {
/* fill the data for the current frame */
s->frame_offset = s->last_frame_offset;
s->pts = s->last_pts;
s->dts = s->last_dts;
/* offset of the next frame */
s->last_frame_offset = s->cur_offset + index;
/* find the packet in which the new frame starts. It
is tricky because of MPEG video start codes
which can begin in one packet and finish in
another packet. In the worst case, an MPEG
video start code could be in 4 different
packets. */
k = s->cur_frame_start_index;
for(i = 0; i < AV_PARSER_PTS_NB; i++) {
if (s->last_frame_offset >= s->cur_frame_offset[k])
break;
k = (k - 1) & (AV_PARSER_PTS_NB - 1);
}
s->last_pts = s->cur_frame_pts[k];
s->last_dts = s->cur_frame_dts[k];
}
if (index < 0)
index = 0;