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h264: improve checks before calling ff_h264_decode_extradata 

The ff_h264_decode_extradata routine now checks for the buffer size
and pointer internally. This makes it possible to remove the external
checks in ff_h264_decode_init.

  In decode_frame there was a size check missing because the buffer
gets tested prior to the invocation of ff_h264_decode_extradata().

Signed-off-by: Alexander Strasser <eclipse7@gmx.net>
This commit is contained in:
Alexander Strasser 2011-09-24 18:23:38 +02:00
parent 715f259bf9
commit baad01d8b4
1 changed files with 2 additions and 3 deletions
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5
libavcodec/h264.c
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@ -1083,8 +1083,7 @@ av_cold int ff_h264_decode_init(AVCodecContext *avctx){
avctx->ticks_per_frame = 2;
}
if(avctx->extradata_size > 0 && avctx->extradata &&
ff_h264_decode_extradata(h, avctx->extradata, avctx->extradata_size))
if(ff_h264_decode_extradata(h, avctx->extradata, avctx->extradata_size))
return -1;
if(h->sps.bitstream_restriction_flag && s->avctx->has_b_frames < h->sps.num_reorder_frames){
@ -3918,7 +3917,7 @@ static int decode_frame(AVCodecContext *avctx,
return 0;
}
if(h->is_avc && AV_RB32(buf)==0x0164001F && buf[5] && buf[8]==0x67)
if(h->is_avc && buf_size >= 9 && AV_RB32(buf)==0x0164001F && buf[5] && buf[8]==0x67)
return ff_h264_decode_extradata(h, buf, buf_size);
buf_index=decode_nal_units(h, buf, buf_size);