1/* 2 * Copyright (C) 2007 Marco Gerards <marco@gnu.org> 3 * Copyright (C) 2009 David Conrad 4 * 5 * This file is part of Libav. 6 * 7 * Libav is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * Libav is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * Dirac Decoder 25 * @author Marco Gerards <marco@gnu.org> 26 */ 27 28#include "libavutil/imgutils.h" 29#include "dirac.h" 30#include "avcodec.h" 31#include "golomb.h" 32#include "mpeg12data.h" 33 34// defaults for source parameters 35static const dirac_source_params dirac_source_parameters_defaults[] = { 36 { 640, 480, 2, 0, 0, 1, 1, 640, 480, 0, 0, 1, 0 }, 37 { 176, 120, 2, 0, 0, 9, 2, 176, 120, 0, 0, 1, 1 }, 38 { 176, 144, 2, 0, 1, 10, 3, 176, 144, 0, 0, 1, 2 }, 39 { 352, 240, 2, 0, 0, 9, 2, 352, 240, 0, 0, 1, 1 }, 40 { 352, 288, 2, 0, 1, 10, 3, 352, 288, 0, 0, 1, 2 }, 41 { 704, 480, 2, 0, 0, 9, 2, 704, 480, 0, 0, 1, 1 }, 42 { 704, 576, 2, 0, 1, 10, 3, 704, 576, 0, 0, 1, 2 }, 43 { 720, 480, 1, 1, 0, 4, 2, 704, 480, 8, 0, 3, 1 }, 44 { 720, 576, 1, 1, 1, 3, 3, 704, 576, 8, 0, 3, 2 }, 45 46 { 1280, 720, 1, 0, 1, 7, 1, 1280, 720, 0, 0, 3, 3 }, 47 { 1280, 720, 1, 0, 1, 6, 1, 1280, 720, 0, 0, 3, 3 }, 48 { 1920, 1080, 1, 1, 1, 4, 1, 1920, 1080, 0, 0, 3, 3 }, 49 { 1920, 1080, 1, 1, 1, 3, 1, 1920, 1080, 0, 0, 3, 3 }, 50 { 1920, 1080, 1, 0, 1, 7, 1, 1920, 1080, 0, 0, 3, 3 }, 51 { 1920, 1080, 1, 0, 1, 6, 1, 1920, 1080, 0, 0, 3, 3 }, 52 { 2048, 1080, 0, 0, 1, 2, 1, 2048, 1080, 0, 0, 4, 4 }, 53 { 4096, 2160, 0, 0, 1, 2, 1, 4096, 2160, 0, 0, 4, 4 }, 54 55 { 3840, 2160, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 }, 56 { 3840, 2160, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 }, 57 { 7680, 4320, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 }, 58 { 7680, 4320, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 }, 59}; 60 61static const AVRational dirac_preset_aspect_ratios[] = { 62 {1, 1}, 63 {10, 11}, 64 {12, 11}, 65 {40, 33}, 66 {16, 11}, 67 {4, 3}, 68}; 69 70static const AVRational dirac_frame_rate[] = { 71 {15000, 1001}, 72 {25, 2}, 73}; 74 75static const struct { 76 uint8_t bitdepth; 77 enum AVColorRange color_range; 78} pixel_range_presets[] = { 79 {8, AVCOL_RANGE_JPEG}, 80 {8, AVCOL_RANGE_MPEG}, 81 {10, AVCOL_RANGE_MPEG}, 82 {12, AVCOL_RANGE_MPEG}, 83}; 84 85static const enum AVColorPrimaries dirac_primaries[] = { 86 AVCOL_PRI_BT709, 87 AVCOL_PRI_SMPTE170M, 88 AVCOL_PRI_BT470BG, 89}; 90 91static const struct { 92 enum AVColorPrimaries color_primaries; 93 enum AVColorSpace colorspace; 94 enum AVColorTransferCharacteristic color_trc; 95} dirac_color_presets[] = { 96 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 }, 97 { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 }, 98 { AVCOL_PRI_BT470BG, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 }, 99 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 }, 100 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_UNSPECIFIED /* DCinema */ }, 101}; 102 103static const enum PixelFormat dirac_pix_fmt[2][3] = { 104 { PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P }, 105 { PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P }, 106}; 107 108static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb, 109 dirac_source_params *source) 110{ 111 AVRational frame_rate = (AVRational){0,0}; 112 unsigned luma_depth = 8, luma_offset = 16; 113 int idx; 114 115 if (get_bits1(gb)) { 116 source->width = svq3_get_ue_golomb(gb); 117 source->height = svq3_get_ue_golomb(gb); 118 } 119 120 // chroma subsampling 121 if (get_bits1(gb)) 122 source->chroma_format = svq3_get_ue_golomb(gb); 123 if (source->chroma_format > 2) { 124 av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n", 125 source->chroma_format); 126 return -1; 127 } 128 129 if (get_bits1(gb)) 130 source->interlaced = svq3_get_ue_golomb(gb); 131 if (source->interlaced > 1) 132 return -1; 133 134 // frame rate 135 if (get_bits1(gb)) { 136 source->frame_rate_index = svq3_get_ue_golomb(gb); 137 138 if (source->frame_rate_index > 10) 139 return -1; 140 141 if (!source->frame_rate_index) { 142 frame_rate.num = svq3_get_ue_golomb(gb); 143 frame_rate.den = svq3_get_ue_golomb(gb); 144 } 145 } 146 if (source->frame_rate_index > 0) { 147 if (source->frame_rate_index <= 8) 148 frame_rate = avpriv_frame_rate_tab[source->frame_rate_index]; 149 else 150 frame_rate = dirac_frame_rate[source->frame_rate_index-9]; 151 } 152 av_reduce(&avctx->time_base.num, &avctx->time_base.den, 153 frame_rate.den, frame_rate.num, 1<<30); 154 155 // aspect ratio 156 if (get_bits1(gb)) { 157 source->aspect_ratio_index = svq3_get_ue_golomb(gb); 158 159 if (source->aspect_ratio_index > 6) 160 return -1; 161 162 if (!source->aspect_ratio_index) { 163 avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb); 164 avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb); 165 } 166 } 167 if (source->aspect_ratio_index > 0) 168 avctx->sample_aspect_ratio = 169 dirac_preset_aspect_ratios[source->aspect_ratio_index-1]; 170 171 if (get_bits1(gb)) { 172 source->clean_width = svq3_get_ue_golomb(gb); 173 source->clean_height = svq3_get_ue_golomb(gb); 174 source->clean_left_offset = svq3_get_ue_golomb(gb); 175 source->clean_right_offset = svq3_get_ue_golomb(gb); 176 } 177 178 // Override signal range. 179 if (get_bits1(gb)) { 180 source->pixel_range_index = svq3_get_ue_golomb(gb); 181 182 if (source->pixel_range_index > 4) 183 return -1; 184 185 // This assumes either fullrange or MPEG levels only 186 if (!source->pixel_range_index) { 187 luma_offset = svq3_get_ue_golomb(gb); 188 luma_depth = av_log2(svq3_get_ue_golomb(gb))+1; 189 svq3_get_ue_golomb(gb); // chroma offset 190 svq3_get_ue_golomb(gb); // chroma excursion 191 192 avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG; 193 } 194 } 195 if (source->pixel_range_index > 0) { 196 idx = source->pixel_range_index-1; 197 luma_depth = pixel_range_presets[idx].bitdepth; 198 avctx->color_range = pixel_range_presets[idx].color_range; 199 } 200 201 if (luma_depth > 8) 202 av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8"); 203 204 avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format]; 205 206 // color spec 207 if (get_bits1(gb)) { 208 idx = source->color_spec_index = svq3_get_ue_golomb(gb); 209 210 if (source->color_spec_index > 4) 211 return -1; 212 213 avctx->color_primaries = dirac_color_presets[idx].color_primaries; 214 avctx->colorspace = dirac_color_presets[idx].colorspace; 215 avctx->color_trc = dirac_color_presets[idx].color_trc; 216 217 if (!source->color_spec_index) { 218 if (get_bits1(gb)) { 219 idx = svq3_get_ue_golomb(gb); 220 if (idx < 3) 221 avctx->color_primaries = dirac_primaries[idx]; 222 } 223 224 if (get_bits1(gb)) { 225 idx = svq3_get_ue_golomb(gb); 226 if (!idx) 227 avctx->colorspace = AVCOL_SPC_BT709; 228 else if (idx == 1) 229 avctx->colorspace = AVCOL_SPC_BT470BG; 230 } 231 232 if (get_bits1(gb) && !svq3_get_ue_golomb(gb)) 233 avctx->color_trc = AVCOL_TRC_BT709; 234 } 235 } else { 236 idx = source->color_spec_index; 237 avctx->color_primaries = dirac_color_presets[idx].color_primaries; 238 avctx->colorspace = dirac_color_presets[idx].colorspace; 239 avctx->color_trc = dirac_color_presets[idx].color_trc; 240 } 241 242 return 0; 243} 244 245int avpriv_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb, 246 dirac_source_params *source) 247{ 248 unsigned version_major; 249 unsigned video_format, picture_coding_mode; 250 251 version_major = svq3_get_ue_golomb(gb); 252 svq3_get_ue_golomb(gb); /* version_minor */ 253 avctx->profile = svq3_get_ue_golomb(gb); 254 avctx->level = svq3_get_ue_golomb(gb); 255 video_format = svq3_get_ue_golomb(gb); 256 257 if (version_major < 2) 258 av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n"); 259 else if (version_major > 2) 260 av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n"); 261 262 if (video_format > 20) 263 return -1; 264 265 // Fill in defaults for the source parameters. 266 *source = dirac_source_parameters_defaults[video_format]; 267 268 // Override the defaults. 269 if (parse_source_parameters(avctx, gb, source)) 270 return -1; 271 272 if (av_image_check_size(source->width, source->height, 0, avctx)) 273 return -1; 274 275 avcodec_set_dimensions(avctx, source->width, source->height); 276 277 // currently only used to signal field coding 278 picture_coding_mode = svq3_get_ue_golomb(gb); 279 if (picture_coding_mode != 0) { 280 av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d", 281 picture_coding_mode); 282 return -1; 283 } 284 return 0; 285} 286