static int svq1_decode_frame(AVCodecContext *avctx, void *data, int *data_size, UINT8 *buf, int buf_size) { MpegEncContext *s=avctx->priv_data; uint8_t *current, *previous; int result, i, x, y, width, height; AVFrame *pict = data; /* initialize bit buffer */ init_get_bits(&s->gb,buf,buf_size); /* decode frame header */ s->f_code = get_bits (&s->gb, 22); if ((s->f_code & ~0x70) || !(s->f_code & 0x60)) return -1; /* swap some header bytes (why?) */ if (s->f_code != 0x20) { uint32_t *src = (uint32_t *) (buf + 4); for (i=0; i < 4; i++) { src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i]; } } result = svq1_decode_frame_header (&s->gb, s); if (result != 0) { #ifdef DEBUG_SVQ1 printf("Error in svq1_decode_frame_header %i\n",result); #endif return result; } //FIXME this avoids some confusion for "B frames" without 2 references //this should be removed after libavcodec can handle more flaxible picture types & ordering if(s->pict_type==B_TYPE && s->last_picture.data[0]==NULL) return buf_size; if(avctx->hurry_up && s->pict_type==B_TYPE) return buf_size; if(MPV_frame_start(s, avctx) < 0) return -1; /* decode y, u and v components */ for (i=0; i < 3; i++) { int linesize; if (i == 0) { width = (s->width+15)&~15; height = (s->height+15)&~15; linesize= s->linesize; } else { if(s->flags&CODEC_FLAG_GRAY) break; width = (s->width/4+15)&~15; height = (s->height/4+15)&~15; linesize= s->uvlinesize; } current = s->current_picture.data[i]; if(s->pict_type==B_TYPE){ previous = s->next_picture.data[i]; }else{ previous = s->last_picture.data[i]; } if (s->pict_type == I_TYPE) { /* keyframe */ for (y=0; y < height; y+=16) { for (x=0; x < width; x+=16) { result = svq1_decode_block_intra (&s->gb, &current[x], linesize); if (result != 0) { #ifdef DEBUG_SVQ1 printf("Error in svq1_decode_block %i (keyframe)\n",result); #endif return result; } } current += 16*linesize; } } else { svq1_pmv_t pmv[width/8+3]; /* delta frame */ memset (pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv_t)); for (y=0; y < height; y+=16) { for (x=0; x < width; x+=16) { result = svq1_decode_delta_block (s, &s->gb, &current[x], previous, linesize, pmv, x, y); if (result != 0) { #ifdef DEBUG_SVQ1 printf("Error in svq1_decode_delta_block %i\n",result); #endif return result; } } pmv[0].x = pmv[0].y = 0; current += 16*linesize; } } } *pict = *(AVFrame*)&s->current_picture; MPV_frame_end(s); *data_size=sizeof(AVFrame); return buf_size; }
static int svq1_decode_frame(AVCodecContext *avctx, void *data, int *data_size, UINT8 *buf, int buf_size) { MpegEncContext *s=avctx->priv_data; uint8_t *current, *previous; int result, i, x, y, width, height; AVFrame *pict = data;   init_get_bits(&s->gb,buf,buf_size);   s->f_code = get_bits (&s->gb, 22); if ((s->f_code & ~0x70) || !(s->f_code & 0x60)) return -1;   if (s->f_code != 0x20) { uint32_t *src = (uint32_t *) (buf + 4); for (i=0; i < 4; i++) { src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i]; } } result = svq1_decode_frame_header (&s->gb, s); if (result != 0) { #ifdef DEBUG_SVQ1 printf("Error in svq1_decode_frame_header %i\n",result); #endif return result; }  