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lavc/pgssubdec: use the PTS from the presentation segment. 

According to the sample for trac ticket #1722, PGS subtitles
are decoded from several packets at the same DTS and varying PTS.
The PTS from the presentation segment seem to be the valid one;
in particular, clear subtitles are too early with the other PTS.
This commit is contained in:
Nicolas George 2012-09-09 16:08:39 +02:00
parent 9dd8272431
commit 37bbc9eb8b
1 changed files with 8 additions and 0 deletions
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8
libavcodec/pgssubdec.c
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@ -67,6 +67,7 @@ typedef struct PGSSubContext {
PGSSubPresentation presentation;
uint32_t clut[256];
PGSSubPicture pictures[UINT16_MAX];
int64_t pts;
int forced_subs_only;
} PGSSubContext;
@ -378,6 +379,7 @@ static int display_end_segment(AVCodecContext *avctx, void *data,
{
AVSubtitle *sub = data;
PGSSubContext *ctx = avctx->priv_data;
int64_t pts;
uint16_t rect;
@ -387,7 +389,10 @@ static int display_end_segment(AVCodecContext *avctx, void *data,
* not been cleared by a subsequent empty display command.
*/
pts = ctx->pts != AV_NOPTS_VALUE ? ctx->pts : sub->pts;
memset(sub, 0, sizeof(*sub));
sub->pts = pts;
ctx->pts = AV_NOPTS_VALUE;
// Blank if last object_count was 0.
if (!ctx->presentation.object_count)
@ -436,8 +441,10 @@ static int display_end_segment(AVCodecContext *avctx, void *data,
static int decode(AVCodecContext *avctx, void *data, int *data_size,
AVPacket *avpkt)
{
PGSSubContext *ctx = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AVSubtitle *sub = data;
const uint8_t *buf_end;
uint8_t segment_type;
@ -482,6 +489,7 @@ static int decode(AVCodecContext *avctx, void *data, int *data_size,
break;
case PRESENTATION_SEGMENT:
parse_presentation_segment(avctx, buf, segment_length);
ctx->pts = sub->pts;
break;
case WINDOW_SEGMENT:
/*