return 0;
}
-/* return the 8 bit start code value and update the search
- 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= *pbuf_ptr;
-
- buf_ptr++; //gurantees that -1 is within the array
- buf_end -= 3; // gurantees that +3 is within the array
-
- while (buf_ptr < buf_end) {
- 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;
- }
- }
- buf_ptr += 2;
- }
- buf_end += 3; //undo the hack above
-
- *pbuf_ptr = buf_end;
- return -1;
-}
-
static int mpeg1_decode_picture(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
if(s->mb_y == s->end_mb_y)
return 0;
- start_code = find_start_code(&buf, s->gb.buffer_end);
+ start_code= -1;
+ buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
mb_y= start_code - SLICE_MIN_START_CODE;
if(mb_y < 0 || mb_y >= s->end_mb_y)
return -1;
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
{
int i;
- uint32_t state;
-
- state= pc->state;
+ uint32_t state= pc->state;
i=0;
if(!pc->frame_start_found){
for(i=0; i<buf_size; i++){
- state= (state<<8) | buf[i];
+ i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
i++;
pc->frame_start_found=1;
if (buf_size == 0)
return 0;
for(; i<buf_size; i++){
- state= (state<<8) | buf[i];
+ i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
if((state&0xFFFFFF00) == 0x100){
if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
pc->frame_start_found=0;
for(;;) {
/* find start next code */
- start_code = find_start_code(&buf_ptr, buf_end);
+ start_code = -1;
+ buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
if (start_code < 0){
if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
if(avctx->thread_count > 1){
/* skip b frames if we dont have reference frames */
if(s2->pict_type==B_TYPE) break;
/* skip P frames if we dont have reference frame no valid header */
- if(s2->pict_type==P_TYPE && !s2->first_slice) break;
+// if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
}
/* skip b frames if we are in a hurry */
if(avctx->hurry_up && s2->pict_type==B_TYPE) break;