static int h261_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { H261Context *h= avctx->priv_data; MpegEncContext *s = &h->s; int ret; AVFrame *pict = data; #ifdef DEBUG printf("*****frame %d size=%d\n", avctx->frame_number, buf_size); printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]); #endif s->flags= avctx->flags; s->flags2= avctx->flags2; /* no supplementary picture */ if (buf_size == 0) { return 0; } h->gob_start_code_skipped=0; retry: init_get_bits(&s->gb, buf, buf_size*8); if(!s->context_initialized){ if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix return -1; } //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){ int i= ff_find_unused_picture(s, 0); s->current_picture_ptr= &s->picture[i]; } ret = h261_decode_picture_header(h); /* skip if the header was thrashed */ if (ret < 0){ av_log(s->avctx, AV_LOG_ERROR, "header damaged\n"); return -1; } if (s->width != avctx->coded_width || s->height != avctx->coded_height){ ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat s->parse_context.buffer=0; MPV_common_end(s); s->parse_context= pc; } if (!s->context_initialized) { avcodec_set_dimensions(avctx, s->width, s->height); goto retry; } // for hurry_up==5 s->current_picture.pict_type= s->pict_type; s->current_picture.key_frame= s->pict_type == I_TYPE; /* skip everything if we are in a hurry>=5 */ if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size); if(MPV_frame_start(s, avctx) < 0) return -1; ff_er_frame_start(s); /* decode each macroblock */ s->mb_x=0; s->mb_y=0; while(h->gob_number < (s->mb_height==18 ? 12 : 5)){ if(ff_h261_resync(h)<0) break; h261_decode_gob(h); } MPV_frame_end(s); assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type); assert(s->current_picture.pict_type == s->pict_type); *pict= *(AVFrame*)s->current_picture_ptr; ff_print_debug_info(s, pict); /* Return the Picture timestamp as the frame number */ /* we substract 1 because it is added on utils.c */ avctx->frame_number = s->picture_number - 1; *data_size = sizeof(AVFrame); return get_consumed_bytes(s, buf_size); }