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avcodec/parser: optimize ff_mpeg4video_split()

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Zhaoxiu Zeng 2015-02-13 13:50:23 +08:00 committed by Michael Niedermayer
parent ba22295e76
commit 3b5ad8fbf7
1 changed files with 6 additions and 4 deletions
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10
libavcodec/parser.c
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@ -28,6 +28,7 @@
#include "libavutil/mem.h"
#include "parser.h"
#include "internal.h"
static AVCodecParser *av_first_parser = NULL;
@ -308,13 +309,14 @@ void ff_parse_close(AVCodecParserContext *s)
int ff_mpeg4video_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
{
int i;
uint32_t state = -1;
const uint8_t *ptr = buf, *end = buf + buf_size;
for (i = 0; i < buf_size; i++) {
state = state << 8 | buf[i];
while (ptr < end) {
ptr = avpriv_find_start_code(ptr, end, &state);
if (state == 0x1B3 || state == 0x1B6)
return i - 3;
return ptr - 4 - buf;
}
return 0;
}