libavcodec/dirac.c

   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
  35 static 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
  61 /* [DIRAC_STD] Table 10.4 - Available preset pixel aspect ratio values */
  62 static const AVRational dirac_preset_aspect_ratios[] = {
  63     {1, 1},
  64     {10, 11},
  65     {12, 11},
  66     {40, 33},
  67     {16, 11},
  68     {4, 3},
  69 };
  70
  71 /* [DIRAC_STD] Values 9,10 of 10.3.5 Frame Rate.
  72  * Table 10.3 Available preset frame rate values
  73  */
  74 static const AVRational dirac_frame_rate[] = {
  75     {15000, 1001},
  76     {25, 2},
  77 };
  78
  79 /* [DIRAC_STD] This should be equivalent to Table 10.5 Available signal
  80  * range presets */
  81 static const struct {
  82     uint8_t             bitdepth;
  83     enum AVColorRange   color_range;
  84 } pixel_range_presets[] = {
  85     {8,  AVCOL_RANGE_JPEG},
  86     {8,  AVCOL_RANGE_MPEG},
  87     {10, AVCOL_RANGE_MPEG},
  88     {12, AVCOL_RANGE_MPEG},
  89 };
  90
  91 static const enum AVColorPrimaries dirac_primaries[] = {
  92     AVCOL_PRI_BT709,
  93     AVCOL_PRI_SMPTE170M,
  94     AVCOL_PRI_BT470BG,
  95 };
  96
  97 static const struct {
  98     enum AVColorPrimaries color_primaries;
  99     enum AVColorSpace colorspace;
 100     enum AVColorTransferCharacteristic color_trc;
 101 } dirac_color_presets[] = {
 102     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },
 103     { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
 104     { AVCOL_PRI_BT470BG,   AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
 105     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },
 106     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_UNSPECIFIED /* DCinema */ },
 107 };
 108
 109 /* [DIRAC_STD] Table 10.2 Supported chroma sampling formats + luma Offset */
 110 static const enum AVPixelFormat dirac_pix_fmt[2][3] = {
 111     { AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P  },
 112     { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P },
 113 };
 114
 115 /* [DIRAC_STD] 10.3 Parse Source Parameters.
 116  * source_parameters(base_video_format) */
 117 static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
 118                                    dirac_source_params *source)
 119 {
 120     AVRational frame_rate = {0,0};
 121     unsigned luma_depth = 8, luma_offset = 16;
 122     int idx;
 123
 124     /* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */
 125     /* [DIRAC_STD] custom_dimensions_flag */
 126     if (get_bits1(gb)) {
 127         source->width  = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH  */
 128         source->height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */
 129     }
 130
 131     /* [DIRAC_STD] 10.3.3 Chroma Sampling Format.
 132      *  chroma_sampling_format(video_params) */
 133     /* [DIRAC_STD] custom_chroma_format_flag */
 134     if (get_bits1(gb))
 135         /* [DIRAC_STD] CHROMA_FORMAT_INDEX */
 136         source->chroma_format = svq3_get_ue_golomb(gb);
 137     if (source->chroma_format > 2) {
 138         av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
 139                source->chroma_format);
 140         return AVERROR_INVALIDDATA;
 141     }
 142
 143     /* [DIRAC_STD] 10.3.4 Scan Format. scan_format(video_params) */
 144     /* [DIRAC_STD] custom_scan_format_flag */
 145     if (get_bits1(gb))
 146         /* [DIRAC_STD] SOURCE_SAMPLING */
 147         source->interlaced = svq3_get_ue_golomb(gb);
 148     if (source->interlaced > 1)
 149         return AVERROR_INVALIDDATA;
 150
 151     /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */
 152     if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */
 153         source->frame_rate_index = svq3_get_ue_golomb(gb);
 154
 155         if (source->frame_rate_index > 10)
 156             return AVERROR_INVALIDDATA;
 157
 158         if (!source->frame_rate_index) {
 159             /* [DIRAC_STD] FRAME_RATE_NUMER */
 160             frame_rate.num = svq3_get_ue_golomb(gb);
 161             /* [DIRAC_STD] FRAME_RATE_DENOM */
 162             frame_rate.den = svq3_get_ue_golomb(gb);
 163         }
 164     }
 165     /* [DIRAC_STD] preset_frame_rate(video_params, index) */
 166     if (source->frame_rate_index > 0) {
 167         if (source->frame_rate_index <= 8)
 168             frame_rate = ff_mpeg12_frame_rate_tab[source->frame_rate_index];
 169         else
 170              /* [DIRAC_STD] Table 10.3 values 9-10 */
 171             frame_rate = dirac_frame_rate[source->frame_rate_index-9];
 172     }
 173     av_reduce(&avctx->time_base.num, &avctx->time_base.den,
 174               frame_rate.den, frame_rate.num, 1<<30);
 175
 176     /* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio.
 177      * pixel_aspect_ratio(video_params) */
 178     if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */
 179          /* [DIRAC_STD] index */
 180         source->aspect_ratio_index = svq3_get_ue_golomb(gb);
 181
 182         if (source->aspect_ratio_index > 6)
 183             return AVERROR_INVALIDDATA;
 184
 185         if (!source->aspect_ratio_index) {
 186             avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb);
 187             avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb);
 188         }
 189     }
 190     /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel
 191      *  aspect ratio values */
 192     if (source->aspect_ratio_index > 0)
 193         avctx->sample_aspect_ratio =
 194                 dirac_preset_aspect_ratios[source->aspect_ratio_index-1];
 195
 196     /* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */
 197     if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */
 198         /* [DIRAC_STD] CLEAN_WIDTH */
 199         source->clean_width        = svq3_get_ue_golomb(gb);
 200          /* [DIRAC_STD] CLEAN_HEIGHT */
 201         source->clean_height       = svq3_get_ue_golomb(gb);
 202          /* [DIRAC_STD] CLEAN_LEFT_OFFSET */
 203         source->clean_left_offset  = svq3_get_ue_golomb(gb);
 204         /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */
 205         source->clean_right_offset = svq3_get_ue_golomb(gb);
 206     }
 207
 208     /* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params)
 209      * WARNING: Some adaptation seems to be done using the
 210      * AVCOL_RANGE_MPEG/JPEG values */
 211     if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */
 212         /* [DIRAC_STD] index */
 213         source->pixel_range_index = svq3_get_ue_golomb(gb);
 214
 215         if (source->pixel_range_index > 4)
 216             return AVERROR_INVALIDDATA;
 217
 218         // This assumes either fullrange or MPEG levels only
 219         if (!source->pixel_range_index) {
 220             luma_offset = svq3_get_ue_golomb(gb);
 221             luma_depth  = av_log2(svq3_get_ue_golomb(gb))+1;
 222             svq3_get_ue_golomb(gb); /* chroma offset    */
 223             svq3_get_ue_golomb(gb); /* chroma excursion */
 224             avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 225         }
 226     }
 227     /* [DIRAC_STD] Table 10.5
 228      * Available signal range presets <--> pixel_range_presets */
 229     if (source->pixel_range_index > 0) {
 230         idx                = source->pixel_range_index-1;
 231         luma_depth         = pixel_range_presets[idx].bitdepth;
 232         avctx->color_range = pixel_range_presets[idx].color_range;
 233     }
 234
 235     if (luma_depth > 8)
 236         av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8");
 237
 238     avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format];
 239
 240     /* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */
 241     if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */
 242          /* [DIRAC_STD] index */
 243         idx = source->color_spec_index = svq3_get_ue_golomb(gb);
 244
 245         if (source->color_spec_index > 4)
 246             return AVERROR_INVALIDDATA;
 247
 248         avctx->color_primaries = dirac_color_presets[idx].color_primaries;
 249         avctx->colorspace      = dirac_color_presets[idx].colorspace;
 250         avctx->color_trc       = dirac_color_presets[idx].color_trc;
 251
 252         if (!source->color_spec_index) {
 253             /* [DIRAC_STD] 10.3.9.1 Colour primaries */
 254             if (get_bits1(gb)) {
 255                 idx = svq3_get_ue_golomb(gb);
 256                 if (idx < 3)
 257                     avctx->color_primaries = dirac_primaries[idx];
 258             }
 259             /* [DIRAC_STD] 10.3.9.2 Colour matrix */
 260             if (get_bits1(gb)) {
 261                 idx = svq3_get_ue_golomb(gb);
 262                 if (!idx)
 263                     avctx->colorspace = AVCOL_SPC_BT709;
 264                 else if (idx == 1)
 265                     avctx->colorspace = AVCOL_SPC_BT470BG;
 266             }
 267             /* [DIRAC_STD] 10.3.9.3 Transfer function */
 268             if (get_bits1(gb) && !svq3_get_ue_golomb(gb))
 269                 avctx->color_trc = AVCOL_TRC_BT709;
 270         }
 271     } else {
 272         idx = source->color_spec_index;
 273         avctx->color_primaries = dirac_color_presets[idx].color_primaries;
 274         avctx->colorspace      = dirac_color_presets[idx].colorspace;
 275         avctx->color_trc       = dirac_color_presets[idx].color_trc;
 276     }
 277
 278     return 0;
 279 }
 280
 281 /* [DIRAC_STD] 10. Sequence Header. sequence_header() */
 282 int avpriv_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,
 283                                    dirac_source_params *source)
 284 {
 285     unsigned version_major;
 286     unsigned video_format, picture_coding_mode;
 287     int ret;
 288
 289     /* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */
 290     version_major  = svq3_get_ue_golomb(gb);
 291     svq3_get_ue_golomb(gb); /* version_minor */
 292     avctx->profile = svq3_get_ue_golomb(gb);
 293     avctx->level   = svq3_get_ue_golomb(gb);
 294     /* [DIRAC_SPEC] sequence_header() -> base_video_format as defined in
 295      * 10.2 Base Video Format, table 10.1 Dirac predefined video formats */
 296     video_format   = svq3_get_ue_golomb(gb);
 297
 298     if (version_major < 2)
 299         av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n");
 300     else if (version_major > 2)
 301         av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
 302
 303     if (video_format > 20)
 304         return AVERROR_INVALIDDATA;
 305
 306     // Fill in defaults for the source parameters.
 307     *source = dirac_source_parameters_defaults[video_format];
 308
 309     /* [DIRAC_STD] 10.3 Source Parameters
 310      * Override the defaults. */
 311     if (ret = parse_source_parameters(avctx, gb, source))
 312         return ret;
 313
 314     if (ret = av_image_check_size(source->width, source->height, 0, avctx))
 315         return ret;
 316
 317     avcodec_set_dimensions(avctx, source->width, source->height);
 318
 319     /* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames
 320      * currently only used to signal field coding */
 321     picture_coding_mode = svq3_get_ue_golomb(gb);
 322     if (picture_coding_mode != 0) {
 323         av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
 324                picture_coding_mode);
 325         return AVERROR_INVALIDDATA;
 326     }
 327     return 0;
 328 }