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parsers: initialize MpegEncContext.slice_context_count to 1

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The mpeg4 video, H264 and VC-1 parser hold (directly or indirectly)
a MpegEncContext in their private context. Since they do not call the
common mpegvideo init function slice_context_count has explicitly set
to 1.
Prevents a null pointer dereference in the h264 parser and fixes
bug 193.
This commit is contained in:
Janne Grunau 2012-01-06 00:17:37 +01:00
parent 580bb77936
commit f907615f08
3 changed files with 10 additions and 0 deletions
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1
libavcodec/h264_parser.c
View File

@ -330,6 +330,7 @@ static int init(AVCodecParserContext *s)
{
H264Context *h = s->priv_data;
h->thread_context[0] = h;
h->s.slice_context_count = 1;
return 0;
}

1
libavcodec/mpeg4video_parser.c
View File

@ -99,6 +99,7 @@ static av_cold int mpeg4video_parse_init(AVCodecParserContext *s)
if (!pc->enc)
return -1;
pc->first_picture = 1;
pc->enc->slice_context_count = 1;
return 0;
}

8
libavcodec/vc1_parser.c
View File

@ -184,9 +184,17 @@ static int vc1_split(AVCodecContext *avctx,
return 0;
}
static int vc1_parse_init(AVCodecParserContext *s)
{
VC1ParseContext *vpc = s->priv_data;
vpc->v.s.slice_context_count = 1;
return 0;
}
AVCodecParser ff_vc1_parser = {
.codec_ids = { CODEC_ID_VC1 },
.priv_data_size = sizeof(VC1ParseContext),
.parser_init = vc1_parse_init,
.parser_parse = vc1_parse,
.parser_close = ff_parse1_close,
.split = vc1_split,