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lavf: probe PGS subtitles definition.

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The resolution is in the packets, so decoding must happen.
Since most other formats do not set the dimension, make it
a special case for PGS. If other codecs were to have the
same requirement, using a CODEC_CAP would be preferred.
This commit is contained in:
Nicolas George 2012-08-07 18:53:00 +02:00
parent 2dedd8f496
commit b1511e00f6
1 changed files with 10 additions and 0 deletions

10
libavformat/utils.c
View File

@ -2309,6 +2309,10 @@ static int has_codec_parameters(AVStream *st, const char **errmsg_ptr)
if (st->info->found_decoder >= 0 && avctx->pix_fmt == PIX_FMT_NONE)
FAIL("unspecified pixel format");
break;
case AVMEDIA_TYPE_SUBTITLE:
if (avctx->codec_id == AV_CODEC_ID_HDMV_PGS_SUBTITLE && !avctx->width)
FAIL("unspecified size");
break;
case AVMEDIA_TYPE_DATA:
if(avctx->codec_id == AV_CODEC_ID_NONE) return 1;
}
@ -2324,6 +2328,7 @@ static int try_decode_frame(AVStream *st, AVPacket *avpkt, AVDictionary **option
AVCodec *codec;
int got_picture = 1, ret = 0;
AVFrame picture;
AVSubtitle subtitle;
AVPacket pkt = *avpkt;
if (!avcodec_is_open(st->codec) && !st->info->found_decoder) {
@ -2369,6 +2374,11 @@ static int try_decode_frame(AVStream *st, AVPacket *avpkt, AVDictionary **option
case AVMEDIA_TYPE_AUDIO:
ret = avcodec_decode_audio4(st->codec, &picture, &got_picture, &pkt);
break;
case AVMEDIA_TYPE_SUBTITLE:
ret = avcodec_decode_subtitle2(st->codec, &subtitle,
&got_picture, &pkt);
ret = pkt.size;
break;
default:
break;
}