static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb, dirac_source_params *source) { AVRational frame_rate = {0,0}; unsigned luma_depth = 8, luma_offset = 16; int idx; int chroma_x_shift, chroma_y_shift; /* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */ /* [DIRAC_STD] custom_dimensions_flag */ if (get_bits1(gb)) { source->width = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH */ source->height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */ } /* [DIRAC_STD] 10.3.3 Chroma Sampling Format. * chroma_sampling_format(video_params) */ /* [DIRAC_STD] custom_chroma_format_flag */ if (get_bits1(gb)) /* [DIRAC_STD] CHROMA_FORMAT_INDEX */ source->chroma_format = svq3_get_ue_golomb(gb); if (source->chroma_format > 2U) { av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n", source->chroma_format); return AVERROR_INVALIDDATA; } /* [DIRAC_STD] 10.3.4 Scan Format. scan_format(video_params) */ /* [DIRAC_STD] custom_scan_format_flag */ if (get_bits1(gb)) /* [DIRAC_STD] SOURCE_SAMPLING */ source->interlaced = svq3_get_ue_golomb(gb); if (source->interlaced > 1U) return AVERROR_INVALIDDATA; /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */ if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */ source->frame_rate_index = svq3_get_ue_golomb(gb); if (source->frame_rate_index > 10U) return AVERROR_INVALIDDATA; if (!source->frame_rate_index) { /* [DIRAC_STD] FRAME_RATE_NUMER */ frame_rate.num = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_RATE_DENOM */ frame_rate.den = svq3_get_ue_golomb(gb); } } /* [DIRAC_STD] preset_frame_rate(video_params, index) */ if (source->frame_rate_index > 0) { if (source->frame_rate_index <= 8) frame_rate = ff_mpeg12_frame_rate_tab[source->frame_rate_index]; else /* [DIRAC_STD] Table 10.3 values 9-10 */ frame_rate = dirac_frame_rate[source->frame_rate_index-9]; } av_reduce(&avctx->time_base.num, &avctx->time_base.den, frame_rate.den, frame_rate.num, 1<<30); /* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio. * pixel_aspect_ratio(video_params) */ if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */ /* [DIRAC_STD] index */ source->aspect_ratio_index = svq3_get_ue_golomb(gb); if (source->aspect_ratio_index > 6U) return AVERROR_INVALIDDATA; if (!source->aspect_ratio_index) { avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb); avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb); } } /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel * aspect ratio values */ if (source->aspect_ratio_index > 0) avctx->sample_aspect_ratio = dirac_preset_aspect_ratios[source->aspect_ratio_index-1]; /* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */ if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */ /* [DIRAC_STD] CLEAN_WIDTH */ source->clean_width = svq3_get_ue_golomb(gb); /* [DIRAC_STD] CLEAN_HEIGHT */ source->clean_height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] CLEAN_LEFT_OFFSET */ source->clean_left_offset = svq3_get_ue_golomb(gb); /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */ source->clean_right_offset = svq3_get_ue_golomb(gb); } /* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params) * WARNING: Some adaptation seems to be done using the * AVCOL_RANGE_MPEG/JPEG values */ if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */ /* [DIRAC_STD] index */ source->pixel_range_index = svq3_get_ue_golomb(gb); if (source->pixel_range_index > 4U) return AVERROR_INVALIDDATA; /* This assumes either fullrange or MPEG levels only */ if (!source->pixel_range_index) { luma_offset = svq3_get_ue_golomb(gb); luma_depth = av_log2(svq3_get_ue_golomb(gb))+1; svq3_get_ue_golomb(gb); /* chroma offset */ svq3_get_ue_golomb(gb); /* chroma excursion */ avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG; } } /* [DIRAC_STD] Table 10.5 * Available signal range presets <--> pixel_range_presets */ if (source->pixel_range_index > 0) { idx = source->pixel_range_index-1; luma_depth = pixel_range_presets[idx].bitdepth; avctx->color_range = pixel_range_presets[idx].color_range; } if (luma_depth > 8) av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8\n"); avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format]; avcodec_get_chroma_sub_sample(avctx->pix_fmt, &chroma_x_shift, &chroma_y_shift); if (!(source->width % (1<<chroma_x_shift)) || !(source->height % (1<<chroma_y_shift))) { av_log(avctx, AV_LOG_ERROR, "Dimensions must be a integer multiply of the chroma subsampling\n"); return AVERROR_INVALIDDATA; } /* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */ if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */ /* [DIRAC_STD] index */ idx = source->color_spec_index = svq3_get_ue_golomb(gb); if (source->color_spec_index > 4U) return AVERROR_INVALIDDATA; avctx->color_primaries = dirac_color_presets[idx].color_primaries; avctx->colorspace = dirac_color_presets[idx].colorspace; avctx->color_trc = dirac_color_presets[idx].color_trc; if (!source->color_spec_index) { /* [DIRAC_STD] 10.3.9.1 Colour primaries */ if (get_bits1(gb)) { idx = svq3_get_ue_golomb(gb); if (idx < 3U) avctx->color_primaries = dirac_primaries[idx]; } /* [DIRAC_STD] 10.3.9.2 Colour matrix */ if (get_bits1(gb)) { idx = svq3_get_ue_golomb(gb); if (!idx) avctx->colorspace = AVCOL_SPC_BT709; else if (idx == 1) avctx->colorspace = AVCOL_SPC_BT470BG; } /* [DIRAC_STD] 10.3.9.3 Transfer function */ if (get_bits1(gb) && !svq3_get_ue_golomb(gb)) avctx->color_trc = AVCOL_TRC_BT709; } } else { idx = source->color_spec_index; avctx->color_primaries = dirac_color_presets[idx].color_primaries; avctx->colorspace = dirac_color_presets[idx].colorspace; avctx->color_trc = dirac_color_presets[idx].color_trc; } return 0; }