static int parse_source_parameters(AVDiracSeqHeader *dsh, GetBitContext *gb, void *log_ctx) { 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)) { dsh->width = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH */ dsh->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 */ dsh->chroma_format = svq3_get_ue_golomb(gb); if (dsh->chroma_format > 2U) { if (log_ctx) av_log(log_ctx, AV_LOG_ERROR, "Unknown chroma format %d\n", dsh->chroma_format); } /* [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 */ dsh->interlaced = svq3_get_ue_golomb(gb); if (dsh->interlaced > 1U) /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */ if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */ dsh->frame_rate_index = svq3_get_ue_golomb(gb); if (dsh->frame_rate_index > 10U) if (!dsh->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 (dsh->frame_rate_index > 0) { if (dsh->frame_rate_index <= 8) frame_rate = ff_mpeg12_frame_rate_tab[dsh->frame_rate_index]; else /* [DIRAC_STD] Table 10.3 values 9-10 */ frame_rate = dirac_frame_rate[dsh->frame_rate_index - 9]; } dsh->framerate = frame_rate; /* [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 */ dsh->aspect_ratio_index = svq3_get_ue_golomb(gb); if (dsh->aspect_ratio_index > 6U) if (!dsh->aspect_ratio_index) { dsh->sample_aspect_ratio.num = svq3_get_ue_golomb(gb); dsh->sample_aspect_ratio.den = svq3_get_ue_golomb(gb); } } /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel * aspect ratio values */ if (dsh->aspect_ratio_index > 0) dsh->sample_aspect_ratio = dirac_preset_aspect_ratios[dsh->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 */ dsh->clean_width = svq3_get_ue_golomb(gb); /* [DIRAC_STD] CLEAN_HEIGHT */ dsh->clean_height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] CLEAN_LEFT_OFFSET */ dsh->clean_left_offset = svq3_get_ue_golomb(gb); /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */ dsh->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 */ dsh->pixel_range_index = svq3_get_ue_golomb(gb); if (dsh->pixel_range_index > 4U) /* This assumes either fullrange or MPEG levels only */ if (!dsh->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 */ dsh->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG; } } /* [DIRAC_STD] Table 10.5 * Available signal range presets <--> pixel_range_presets */ if (dsh->pixel_range_index > 0) { idx = dsh->pixel_range_index - 1; luma_depth = pixel_range_presets[idx].bitdepth; dsh->color_range = pixel_range_presets[idx].color_range; } dsh->bit_depth = luma_depth; dsh->pix_fmt = dirac_pix_fmt[dsh->chroma_format][dsh->pixel_range_index-2]; avcodec_get_chroma_sub_sample(dsh->pix_fmt, &chroma_x_shift, &chroma_y_shift); if ((dsh->width % (1<<chroma_x_shift)) || (dsh->height % (1<<chroma_y_shift))) { if (log_ctx) av_log(log_ctx, AV_LOG_ERROR, "Dimensions must be an integer multiple of the chroma subsampling\n"); } /* [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 = dsh->color_spec_index = svq3_get_ue_golomb(gb); if (dsh->color_spec_index > 4U) dsh->color_primaries = dirac_color_presets[idx].color_primaries; dsh->colorspace = dirac_color_presets[idx].colorspace; dsh->color_trc = dirac_color_presets[idx].color_trc; if (!dsh->color_spec_index) { /* [DIRAC_STD] 10.3.9.1 Colour primaries */ if (get_bits1(gb)) { idx = svq3_get_ue_golomb(gb); if (idx < 3U) dsh->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) dsh->colorspace = AVCOL_SPC_BT709; else if (idx == 1) dsh->colorspace = AVCOL_SPC_BT470BG; } /* [DIRAC_STD] 10.3.9.3 Transfer function */ if (get_bits1(gb) && !svq3_get_ue_golomb(gb)) dsh->color_trc = AVCOL_TRC_BT709; } } else { idx = dsh->color_spec_index; dsh->color_primaries = dirac_color_presets[idx].color_primaries; dsh->colorspace = dirac_color_presets[idx].colorspace; dsh->color_trc = dirac_color_presets[idx].color_trc; } return 0; }