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faster find_startcode()

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Originally committed as revision 4939 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2006-02-04 20:32:02 +00:00
parent 8f0df75438
commit 82fcbc145d
4 changed files with 38 additions and 57 deletions
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25
libavcodec/parser.c
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@@ -272,28 +272,6 @@ int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size)
return 0;
}
static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
{
const uint8_t *buf_ptr;
unsigned int state=0xFFFFFFFF, v;
int val;
buf_ptr = *pbuf_ptr;
while (buf_ptr < buf_end) {
v = *buf_ptr++;
if (state == 0x000001) {
state = ((state << 8) | v) & 0xffffff;
val = state;
goto found;
}
state = ((state << 8) | v) & 0xffffff;
}
val = -1;
found:
*pbuf_ptr = buf_ptr;
return val;
}
/* XXX: merge with libavcodec ? */
#define MPEG1_FRAME_RATE_BASE 1001
@@ -335,7 +313,8 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
s->repeat_pict = 0;
buf_end = buf + buf_size;
while (buf < buf_end) {
start_code = find_start_code(&buf, buf_end);
start_code= -1;
buf= ff_find_start_code(buf, buf_end, &start_code);
bytes_left = buf_end - buf;
switch(start_code) {
case PICTURE_START_CODE: