/* * Copyright (C) 2007 Marco Gerards <marco@gnu.org> * Copyright (C) 2009 David Conrad * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Dirac Decoder * @author Marco Gerards <marco@gnu.org> */ #include "libavutil/imgutils.h" #include "dirac.h" #include "avcodec.h" #include "golomb.h" #include "mpeg12data.h" // defaults for source parameters static const dirac_source_params dirac_source_parameters_defaults[] = { { 640, 480, 2, 0, 0, 1, 1, 640, 480, 0, 0, 1, 0 }, { 176, 120, 2, 0, 0, 9, 2, 176, 120, 0, 0, 1, 1 }, { 176, 144, 2, 0, 1, 10, 3, 176, 144, 0, 0, 1, 2 }, { 352, 240, 2, 0, 0, 9, 2, 352, 240, 0, 0, 1, 1 }, { 352, 288, 2, 0, 1, 10, 3, 352, 288, 0, 0, 1, 2 }, { 704, 480, 2, 0, 0, 9, 2, 704, 480, 0, 0, 1, 1 }, { 704, 576, 2, 0, 1, 10, 3, 704, 576, 0, 0, 1, 2 }, { 720, 480, 1, 1, 0, 4, 2, 704, 480, 8, 0, 3, 1 }, { 720, 576, 1, 1, 1, 3, 3, 704, 576, 8, 0, 3, 2 }, { 1280, 720, 1, 0, 1, 7, 1, 1280, 720, 0, 0, 3, 3 }, { 1280, 720, 1, 0, 1, 6, 1, 1280, 720, 0, 0, 3, 3 }, { 1920, 1080, 1, 1, 1, 4, 1, 1920, 1080, 0, 0, 3, 3 }, { 1920, 1080, 1, 1, 1, 3, 1, 1920, 1080, 0, 0, 3, 3 }, { 1920, 1080, 1, 0, 1, 7, 1, 1920, 1080, 0, 0, 3, 3 }, { 1920, 1080, 1, 0, 1, 6, 1, 1920, 1080, 0, 0, 3, 3 }, { 2048, 1080, 0, 0, 1, 2, 1, 2048, 1080, 0, 0, 4, 4 }, { 4096, 2160, 0, 0, 1, 2, 1, 4096, 2160, 0, 0, 4, 4 }, { 3840, 2160, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 }, { 3840, 2160, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 }, { 7680, 4320, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 }, { 7680, 4320, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 }, }; /* [DIRAC_STD] Table 10.4 - Available preset pixel aspect ratio values */ static const AVRational dirac_preset_aspect_ratios[] = { {1, 1}, {10, 11}, {12, 11}, {40, 33}, {16, 11}, {4, 3}, }; /* [DIRAC_STD] Values 9,10 of 10.3.5 Frame Rate. * Table 10.3 Available preset frame rate values */ static const AVRational dirac_frame_rate[] = { {15000, 1001}, {25, 2}, }; /* [DIRAC_STD] This should be equivalent to Table 10.5 Available signal * range presets */ static const struct { uint8_t bitdepth; enum AVColorRange color_range; } pixel_range_presets[] = { {8, AVCOL_RANGE_JPEG}, {8, AVCOL_RANGE_MPEG}, {10, AVCOL_RANGE_MPEG}, {12, AVCOL_RANGE_MPEG}, }; static const enum AVColorPrimaries dirac_primaries[] = { AVCOL_PRI_BT709, AVCOL_PRI_SMPTE170M, AVCOL_PRI_BT470BG, }; static const struct { enum AVColorPrimaries color_primaries; enum AVColorSpace colorspace; enum AVColorTransferCharacteristic color_trc; } dirac_color_presets[] = { { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 }, { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 }, { AVCOL_PRI_BT470BG, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 }, { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 }, { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_UNSPECIFIED /* DCinema */ }, }; /* [DIRAC_STD] Table 10.2 Supported chroma sampling formats + luma Offset */ static const enum AVPixelFormat dirac_pix_fmt[2][3] = { { AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P }, { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P }, }; /* [DIRAC_STD] 10.3 Parse Source Parameters. * source_parameters(base_video_format) */ 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; /* [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 > 2) { 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 > 1) 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 > 10) 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 > 6) 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 > 4) 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"); avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format]; /* [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 > 4) 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 < 3) 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; } /* [DIRAC_STD] 10. Sequence Header. sequence_header() */ int avpriv_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb, dirac_source_params *source) { unsigned version_major; unsigned video_format, picture_coding_mode; int ret; /* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */ version_major = svq3_get_ue_golomb(gb); svq3_get_ue_golomb(gb); /* version_minor */ avctx->profile = svq3_get_ue_golomb(gb); avctx->level = svq3_get_ue_golomb(gb); /* [DIRAC_SPEC] sequence_header() -> base_video_format as defined in * 10.2 Base Video Format, table 10.1 Dirac predefined video formats */ video_format = svq3_get_ue_golomb(gb); if (version_major < 2) av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n"); else if (version_major > 2) av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n"); if (video_format > 20) return AVERROR_INVALIDDATA; // Fill in defaults for the source parameters. *source = dirac_source_parameters_defaults[video_format]; /* [DIRAC_STD] 10.3 Source Parameters * Override the defaults. */ if (ret = parse_source_parameters(avctx, gb, source)) return ret; if (ret = av_image_check_size(source->width, source->height, 0, avctx)) return ret; avcodec_set_dimensions(avctx, source->width, source->height); /* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames * currently only used to signal field coding */ picture_coding_mode = svq3_get_ue_golomb(gb); if (picture_coding_mode != 0) { av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d", picture_coding_mode); return AVERROR_INVALIDDATA; } return 0; }