1/* 2 * Copyright (C) 2007 Marco Gerards <marco@gnu.org> 3 * Copyright (C) 2009 David Conrad 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "dirac.h" 29#include "avcodec.h" 30#include "golomb.h" 31#include "mpeg12data.h" 32 33// defaults for source parameters 34static const dirac_source_params dirac_source_parameters_defaults[] = { 35 { 640, 480, 2, 0, 0, 1, 1, 640, 480, 0, 0, 1, 0 }, 36 { 176, 120, 2, 0, 0, 9, 2, 176, 120, 0, 0, 1, 1 }, 37 { 176, 144, 2, 0, 1, 10, 3, 176, 144, 0, 0, 1, 2 }, 38 { 352, 240, 2, 0, 0, 9, 2, 352, 240, 0, 0, 1, 1 }, 39 { 352, 288, 2, 0, 1, 10, 3, 352, 288, 0, 0, 1, 2 }, 40 { 704, 480, 2, 0, 0, 9, 2, 704, 480, 0, 0, 1, 1 }, 41 { 704, 576, 2, 0, 1, 10, 3, 704, 576, 0, 0, 1, 2 }, 42 { 720, 480, 1, 1, 0, 4, 2, 704, 480, 8, 0, 3, 1 }, 43 { 720, 576, 1, 1, 1, 3, 3, 704, 576, 8, 0, 3, 2 }, 44 45 { 1280, 720, 1, 0, 1, 7, 1, 1280, 720, 0, 0, 3, 3 }, 46 { 1280, 720, 1, 0, 1, 6, 1, 1280, 720, 0, 0, 3, 3 }, 47 { 1920, 1080, 1, 1, 1, 4, 1, 1920, 1080, 0, 0, 3, 3 }, 48 { 1920, 1080, 1, 1, 1, 3, 1, 1920, 1080, 0, 0, 3, 3 }, 49 { 1920, 1080, 1, 0, 1, 7, 1, 1920, 1080, 0, 0, 3, 3 }, 50 { 1920, 1080, 1, 0, 1, 6, 1, 1920, 1080, 0, 0, 3, 3 }, 51 { 2048, 1080, 0, 0, 1, 2, 1, 2048, 1080, 0, 0, 4, 4 }, 52 { 4096, 2160, 0, 0, 1, 2, 1, 4096, 2160, 0, 0, 4, 4 }, 53 54 { 3840, 2160, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 }, 55 { 3840, 2160, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 }, 56 { 7680, 4320, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 }, 57 { 7680, 4320, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 }, 58}; 59 60static const AVRational dirac_preset_aspect_ratios[] = { 61 {1, 1}, 62 {10, 11}, 63 {12, 11}, 64 {40, 33}, 65 {16, 11}, 66 {4, 3}, 67}; 68 69static const AVRational dirac_frame_rate[] = { 70 {15000, 1001}, 71 {25, 2}, 72}; 73 74static const struct { 75 uint8_t bitdepth; 76 enum AVColorRange color_range; 77} pixel_range_presets[] = { 78 {8, AVCOL_RANGE_JPEG}, 79 {8, AVCOL_RANGE_MPEG}, 80 {10, AVCOL_RANGE_MPEG}, 81 {12, AVCOL_RANGE_MPEG}, 82}; 83 84static const enum AVColorPrimaries dirac_primaries[] = { 85 AVCOL_PRI_BT709, 86 AVCOL_PRI_SMPTE170M, 87 AVCOL_PRI_BT470BG, 88}; 89 90static const struct { 91 enum AVColorPrimaries color_primaries; 92 enum AVColorSpace colorspace; 93 enum AVColorTransferCharacteristic color_trc; 94} dirac_color_presets[] = { 95 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 }, 96 { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 }, 97 { AVCOL_PRI_BT470BG, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 }, 98 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 }, 99 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_UNSPECIFIED /* DCinema */ }, 100}; 101 102static const enum PixelFormat dirac_pix_fmt[2][3] = { 103 { PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P }, 104 { PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P }, 105}; 106 107static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb, 108 dirac_source_params *source) 109{ 110 AVRational frame_rate = (AVRational){0,0}; 111 unsigned luma_depth = 8, luma_offset = 16; 112 int idx; 113 114 if (get_bits1(gb)) { 115 source->width = svq3_get_ue_golomb(gb); 116 source->height = svq3_get_ue_golomb(gb); 117 } 118 119 // chroma subsampling 120 if (get_bits1(gb)) 121 source->chroma_format = svq3_get_ue_golomb(gb); 122 if (source->chroma_format > 2) { 123 av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n", 124 source->chroma_format); 125 return -1; 126 } 127 128 if (get_bits1(gb)) 129 source->interlaced = svq3_get_ue_golomb(gb); 130 if (source->interlaced > 1) 131 return -1; 132 133 // frame rate 134 if (get_bits1(gb)) { 135 source->frame_rate_index = svq3_get_ue_golomb(gb); 136 137 if (source->frame_rate_index > 10) 138 return -1; 139 140 if (!source->frame_rate_index) { 141 frame_rate.num = svq3_get_ue_golomb(gb); 142 frame_rate.den = svq3_get_ue_golomb(gb); 143 } 144 } 145 if (source->frame_rate_index > 0) { 146 if (source->frame_rate_index <= 8) 147 frame_rate = ff_frame_rate_tab[source->frame_rate_index]; 148 else 149 frame_rate = dirac_frame_rate[source->frame_rate_index-9]; 150 } 151 av_reduce(&avctx->time_base.num, &avctx->time_base.den, 152 frame_rate.den, frame_rate.num, 1<<30); 153 154 // aspect ratio 155 if (get_bits1(gb)) { 156 source->aspect_ratio_index = svq3_get_ue_golomb(gb); 157 158 if (source->aspect_ratio_index > 6) 159 return -1; 160 161 if (!source->aspect_ratio_index) { 162 avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb); 163 avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb); 164 } 165 } 166 if (source->aspect_ratio_index > 0) 167 avctx->sample_aspect_ratio = 168 dirac_preset_aspect_ratios[source->aspect_ratio_index-1]; 169 170 if (get_bits1(gb)) { 171 source->clean_width = svq3_get_ue_golomb(gb); 172 source->clean_height = svq3_get_ue_golomb(gb); 173 source->clean_left_offset = svq3_get_ue_golomb(gb); 174 source->clean_right_offset = svq3_get_ue_golomb(gb); 175 } 176 177 // Override signal range. 178 if (get_bits1(gb)) { 179 source->pixel_range_index = svq3_get_ue_golomb(gb); 180 181 if (source->pixel_range_index > 4) 182 return -1; 183 184 // This assumes either fullrange or MPEG levels only 185 if (!source->pixel_range_index) { 186 luma_offset = svq3_get_ue_golomb(gb); 187 luma_depth = av_log2(svq3_get_ue_golomb(gb))+1; 188 svq3_get_ue_golomb(gb); // chroma offset 189 svq3_get_ue_golomb(gb); // chroma excursion 190 191 avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG; 192 } 193 } 194 if (source->pixel_range_index > 0) { 195 idx = source->pixel_range_index-1; 196 luma_depth = pixel_range_presets[idx].bitdepth; 197 avctx->color_range = pixel_range_presets[idx].color_range; 198 } 199 200 if (luma_depth > 8) 201 av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8"); 202 203 avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format]; 204 205 // color spec 206 if (get_bits1(gb)) { 207 idx = source->color_spec_index = svq3_get_ue_golomb(gb); 208 209 if (source->color_spec_index > 4) 210 return -1; 211 212 avctx->color_primaries = dirac_color_presets[idx].color_primaries; 213 avctx->colorspace = dirac_color_presets[idx].colorspace; 214 avctx->color_trc = dirac_color_presets[idx].color_trc; 215 216 if (!source->color_spec_index) { 217 if (get_bits1(gb)) { 218 idx = svq3_get_ue_golomb(gb); 219 if (idx < 3) 220 avctx->color_primaries = dirac_primaries[idx]; 221 } 222 223 if (get_bits1(gb)) { 224 idx = svq3_get_ue_golomb(gb); 225 if (!idx) 226 avctx->colorspace = AVCOL_SPC_BT709; 227 else if (idx == 1) 228 avctx->colorspace = AVCOL_SPC_BT470BG; 229 } 230 231 if (get_bits1(gb) && !svq3_get_ue_golomb(gb)) 232 avctx->color_trc = AVCOL_TRC_BT709; 233 } 234 } else { 235 idx = source->color_spec_index; 236 avctx->color_primaries = dirac_color_presets[idx].color_primaries; 237 avctx->colorspace = dirac_color_presets[idx].colorspace; 238 avctx->color_trc = dirac_color_presets[idx].color_trc; 239 } 240 241 return 0; 242} 243 244int ff_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb, 245 dirac_source_params *source) 246{ 247 unsigned version_major, version_minor; 248 unsigned video_format, picture_coding_mode; 249 250 version_major = svq3_get_ue_golomb(gb); 251 version_minor = svq3_get_ue_golomb(gb); 252 avctx->profile = svq3_get_ue_golomb(gb); 253 avctx->level = svq3_get_ue_golomb(gb); 254 video_format = svq3_get_ue_golomb(gb); 255 256 if (version_major < 2) 257 av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n"); 258 else if (version_major > 2) 259 av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n"); 260 261 if (video_format > 20) 262 return -1; 263 264 // Fill in defaults for the source parameters. 265 *source = dirac_source_parameters_defaults[video_format]; 266 267 // Override the defaults. 268 if (parse_source_parameters(avctx, gb, source)) 269 return -1; 270 271 if (avcodec_check_dimensions(avctx, source->width, source->height)) 272 return -1; 273 274 avcodec_set_dimensions(avctx, source->width, source->height); 275 276 // currently only used to signal field coding 277 picture_coding_mode = svq3_get_ue_golomb(gb); 278 if (picture_coding_mode != 0) { 279 av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d", 280 picture_coding_mode); 281 return -1; 282 } 283 return 0; 284} 285