static int rv20_decode_picture_header(RVDecContext *rv) { MpegEncContext *s = &rv->m; int seq, mb_pos, i; int rpr_bits; #if 0 GetBitContext gb= s->gb; for(i=0; i<64; i++){ av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&gb)); if(i%4==3) av_log(s->avctx, AV_LOG_DEBUG, " "); } av_log(s->avctx, AV_LOG_DEBUG, "\n"); #endif #if 0 av_log(s->avctx, AV_LOG_DEBUG, "%3dx%03d/%02Xx%02X ", s->width, s->height, s->width/4, s->height/4); for(i=0; i<s->avctx->extradata_size; i++){ av_log(s->avctx, AV_LOG_DEBUG, "%02X ", ((uint8_t*)s->avctx->extradata)[i]); if(i%4==3) av_log(s->avctx, AV_LOG_DEBUG, " "); } av_log(s->avctx, AV_LOG_DEBUG, "\n"); #endif i= get_bits(&s->gb, 2); switch(i){ case 0: s->pict_type= AV_PICTURE_TYPE_I; break; case 1: s->pict_type= AV_PICTURE_TYPE_I; break; //hmm ... case 2: s->pict_type= AV_PICTURE_TYPE_P; break; case 3: s->pict_type= AV_PICTURE_TYPE_B; break; default: av_log(s->avctx, AV_LOG_ERROR, "unknown frame type\n"); return -1; } if(s->low_delay && s->pict_type==AV_PICTURE_TYPE_B){ av_log(s->avctx, AV_LOG_ERROR, "low delay B\n"); return -1; } if(s->last_picture_ptr==NULL && s->pict_type==AV_PICTURE_TYPE_B){ av_log(s->avctx, AV_LOG_ERROR, "early B pix\n"); return -1; } if (get_bits1(&s->gb)){ av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n"); return -1; } s->qscale = get_bits(&s->gb, 5); if(s->qscale==0){ av_log(s->avctx, AV_LOG_ERROR, "error, qscale:0\n"); return -1; } if(RV_GET_MINOR_VER(rv->sub_id) >= 2) s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres; if(RV_GET_MINOR_VER(rv->sub_id) <= 1) seq = get_bits(&s->gb, 8) << 7; else seq = get_bits(&s->gb, 13) << 2; rpr_bits = s->avctx->extradata[1] & 7; if(rpr_bits){ int f, new_w, new_h; rpr_bits = FFMIN((rpr_bits >> 1) + 1, 3); f = get_bits(&s->gb, rpr_bits); if(f){ new_w= 4*((uint8_t*)s->avctx->extradata)[6+2*f]; new_h= 4*((uint8_t*)s->avctx->extradata)[7+2*f]; }else{ new_w= s->orig_width ; new_h= s->orig_height; } if(new_w != s->width || new_h != s->height){ AVRational old_aspect = s->avctx->sample_aspect_ratio; av_log(s->avctx, AV_LOG_DEBUG, "attempting to change resolution to %dx%d\n", new_w, new_h); if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0) return -1; ff_MPV_common_end(s); // attempt to keep aspect during typical resolution switches if (!old_aspect.num) old_aspect = (AVRational){1, 1}; if (2 * new_w * s->height == new_h * s->width) s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1}); if (new_w * s->height == 2 * new_h * s->width) s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2}); avcodec_set_dimensions(s->avctx, new_w, new_h); s->width = new_w; s->height = new_h; if (ff_MPV_common_init(s) < 0) return -1; } if(s->avctx->debug & FF_DEBUG_PICT_INFO){ av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d\n", f, rpr_bits); } } if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0) return AVERROR_INVALIDDATA; mb_pos = ff_h263_decode_mba(s); seq |= s->time &~0x7FFF; if(seq - s->time > 0x4000) seq -= 0x8000; if(seq - s->time < -0x4000) seq += 0x8000; if(seq != s->time){ if(s->pict_type!=AV_PICTURE_TYPE_B){ s->time= seq; s->pp_time= s->time - s->last_non_b_time; s->last_non_b_time= s->time; }else{ s->time= seq; s->pb_time= s->pp_time - (s->last_non_b_time - s->time); if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){ av_log(s->avctx, AV_LOG_DEBUG, "messed up order, possible from seeking? skipping current b frame\n"); return FRAME_SKIPPED; } ff_mpeg4_init_direct_mv(s); } } s->no_rounding= get_bits1(&s->gb); if(RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B) skip_bits(&s->gb, 5); // binary decoder reads 3+2 bits here but they don't seem to be used s->f_code = 1; s->unrestricted_mv = 1; s->h263_aic= s->pict_type == AV_PICTURE_TYPE_I; // s->alt_inter_vlc=1; // s->obmc=1; // s->umvplus=1; s->modified_quant=1; if(!s->avctx->lowres) s->loop_filter=1; if(s->avctx->debug & FF_DEBUG_PICT_INFO){ av_log(s->avctx, AV_LOG_INFO, "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n", seq, s->mb_x, s->mb_y, s->pict_type, s->qscale, s->no_rounding); } av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay); return s->mb_width*s->mb_height - mb_pos; }