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FFmpeg/libavcodec/dirac.c

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  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. }