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ffv1: Add a CRC check to the global header with version 1.3

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-20 14:47:24 +02:00
parent 9750254885
commit d7a4c43f18
1 changed files with 14 additions and 1 deletions
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15
libavcodec/ffv1.c
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@ -35,6 +35,7 @@
#include "mathops.h"
#include "libavutil/pixdesc.h"
#include "libavutil/avassert.h"
#include "libavutil/crc.h"
#ifdef __INTEL_COMPILER
#undef av_flatten
@ -775,6 +776,7 @@ static int write_extra_header(FFV1Context *f){
uint8_t state[CONTEXT_SIZE];
int i, j, k;
uint8_t state2[32][CONTEXT_SIZE];
unsigned v;
memset(state2, 128, sizeof(state2));
memset(state, 128, sizeof(state));
@ -823,6 +825,9 @@ static int write_extra_header(FFV1Context *f){
}
f->avctx->extradata_size= ff_rac_terminate(c);
v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, f->avctx->extradata, f->avctx->extradata_size);
AV_WL32(f->avctx->extradata + f->avctx->extradata_size, v);
f->avctx->extradata_size += 4;
return 0;
}
@ -1613,6 +1618,15 @@ static int read_extra_header(FFV1Context *f){
}
}
if(f->version > 2){
unsigned v;
v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, f->avctx->extradata, f->avctx->extradata_size);
if(v){
av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v);
return AVERROR_INVALIDDATA;
}
}
return 0;
}
@ -1767,7 +1781,6 @@ static int read_header(FFV1Context *f){
p->context_count= context_count;
}
}
return 0;
}