state. Return -1 if no start code found */
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;
+ const uint8_t *buf_ptr= *pbuf_ptr;
+
+ buf_ptr++; //gurantees that -1 is within the array
+ buf_end -= 2; // gurantees that +2 is within the array
- buf_ptr = *pbuf_ptr;
while (buf_ptr < buf_end) {
- v = *buf_ptr++;
- if (state == 0x000001) {
- state = ((state << 8) | v) & 0xffffff;
- val = state;
- goto found;
+ if(*buf_ptr==0){
+ while(buf_ptr < buf_end && buf_ptr[1]==0)
+ buf_ptr++;
+
+ if(buf_ptr[-1] == 0 && buf_ptr[1] == 1){
+ *pbuf_ptr = buf_ptr+3;
+ return buf_ptr[2] + 0x100;
+ }
}
- state = ((state << 8) | v) & 0xffffff;
+ buf_ptr += 2;
}
- val = -1;
- found:
- *pbuf_ptr = buf_ptr;
- return val;
+ buf_end += 2; //undo the hack above
+
+ *pbuf_ptr = buf_end;
+ return -1;
}
static int mpeg1_decode_picture(AVCodecContext *avctx,