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avcodec/dvbsubdec: DVB subtitles decoder: support of 5 bytes extradata format

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Reviewed-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
mrlika 2014-02-03 14:11:05 +02:00 committed by Michael Niedermayer
parent ef5d32b9c5
commit 36a6297953
1 changed files with 6 additions and 2 deletions
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8
libavcodec/dvbsubdec.c
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@ -367,11 +367,15 @@ static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
int i, r, g, b, a = 0;
DVBSubContext *ctx = avctx->priv_data;
if (!avctx->extradata || avctx->extradata_size != 4) {
av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n");
if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
ctx->composition_id = -1;
ctx->ancillary_id = -1;
} else {
if (avctx->extradata_size > 5) {
av_log(avctx, AV_LOG_WARNING, "Decoding first DVB subtitles sub-stream\n");
}
ctx->composition_id = AV_RB16(avctx->extradata);
ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
}