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avcodec/vc1: simplify vc1_split()

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
zhaoxiu.zeng
2015-02-13 00:03:21 +08:00
committed by Michael Niedermayer
parent b39ac9d210
commit b4b9a64bdb
1 changed files with 11 additions and 12 deletions
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23
libavcodec/vc1_parser.c
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@@ -29,6 +29,7 @@
#include "parser.h"
#include "vc1.h"
#include "get_bits.h"
#include "internal.h"
/** The maximum number of bytes of a sequence, entry point or
* frame header whose values we pay any attention to */
@@ -250,20 +251,18 @@ static int vc1_parse(AVCodecParserContext *s,
static int vc1_split(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
int i;
uint32_t state= -1;
int charged=0;
uint32_t state = -1;
int charged = 0;
const uint8_t *ptr = buf, *end = buf + buf_size;
for(i=0; i<buf_size; i++){
state= (state<<8) | buf[i];
if(IS_MARKER(state)){
if(state == VC1_CODE_SEQHDR || state == VC1_CODE_ENTRYPOINT){
charged=1;
}else if(charged){
return i-3;
}
}
while (ptr < end) {
ptr = avpriv_find_start_code(ptr, end, &state);
if (state == VC1_CODE_SEQHDR || state == VC1_CODE_ENTRYPOINT) {
charged = 1;
} else if (charged && IS_MARKER(state))
return ptr - 4 - buf;
}
return 0;
}