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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 "internal.h"

  33. #include "mpeg12data.h"

  34. 

  35. // defaults for source parameters

  36. static const dirac_source_params dirac_source_parameters_defaults[] = {

  37.     { 640,  480,  2, 0, 0, 1,  1, 640,  480,  0, 0, 1, 0 },

  38.     { 176,  120,  2, 0, 0, 9,  2, 176,  120,  0, 0, 1, 1 },

  39.     { 176,  144,  2, 0, 1, 10, 3, 176,  144,  0, 0, 1, 2 },

  40.     { 352,  240,  2, 0, 0, 9,  2, 352,  240,  0, 0, 1, 1 },

  41.     { 352,  288,  2, 0, 1, 10, 3, 352,  288,  0, 0, 1, 2 },

  42.     { 704,  480,  2, 0, 0, 9,  2, 704,  480,  0, 0, 1, 1 },

  43.     { 704,  576,  2, 0, 1, 10, 3, 704,  576,  0, 0, 1, 2 },

  44.     { 720,  480,  1, 1, 0, 4,  2, 704,  480,  8, 0, 3, 1 },

  45.     { 720,  576,  1, 1, 1, 3,  3, 704,  576,  8, 0, 3, 2 },

  46. 

  47.     { 1280, 720,  1, 0, 1, 7,  1, 1280, 720,  0, 0, 3, 3 },

  48.     { 1280, 720,  1, 0, 1, 6,  1, 1280, 720,  0, 0, 3, 3 },

  49.     { 1920, 1080, 1, 1, 1, 4,  1, 1920, 1080, 0, 0, 3, 3 },

  50.     { 1920, 1080, 1, 1, 1, 3,  1, 1920, 1080, 0, 0, 3, 3 },

  51.     { 1920, 1080, 1, 0, 1, 7,  1, 1920, 1080, 0, 0, 3, 3 },

  52.     { 1920, 1080, 1, 0, 1, 6,  1, 1920, 1080, 0, 0, 3, 3 },

  53.     { 2048, 1080, 0, 0, 1, 2,  1, 2048, 1080, 0, 0, 4, 4 },

  54.     { 4096, 2160, 0, 0, 1, 2,  1, 4096, 2160, 0, 0, 4, 4 },

  55. 

  56.     { 3840, 2160, 1, 0, 1, 7,  1, 3840, 2160, 0, 0, 3, 3 },

  57.     { 3840, 2160, 1, 0, 1, 6,  1, 3840, 2160, 0, 0, 3, 3 },

  58.     { 7680, 4320, 1, 0, 1, 7,  1, 3840, 2160, 0, 0, 3, 3 },

  59.     { 7680, 4320, 1, 0, 1, 6,  1, 3840, 2160, 0, 0, 3, 3 },

  60. };

  61. 

  62. /* [DIRAC_STD] Table 10.4 - Available preset pixel aspect ratio values */

  63. static const AVRational dirac_preset_aspect_ratios[] = {

  64.     {1, 1},

  65.     {10, 11},

  66.     {12, 11},

  67.     {40, 33},

  68.     {16, 11},

  69.     {4, 3},

  70. };

  71. 

  72. /* [DIRAC_STD] Values 9,10 of 10.3.5 Frame Rate.

  73.  * Table 10.3 Available preset frame rate values

  74.  */

  75. static const AVRational dirac_frame_rate[] = {

  76.     {15000, 1001},

  77.     {25, 2},

  78. };

  79. 

  80. /* [DIRAC_STD] This should be equivalent to Table 10.5 Available signal

  81.  * range presets */

  82. static const struct {

  83.     uint8_t             bitdepth;

  84.     enum AVColorRange   color_range;

  85. } pixel_range_presets[] = {

  86.     {8,  AVCOL_RANGE_JPEG},

  87.     {8,  AVCOL_RANGE_MPEG},

  88.     {10, AVCOL_RANGE_MPEG},

  89.     {12, AVCOL_RANGE_MPEG},

  90. };

  91. 

  92. static const enum AVColorPrimaries dirac_primaries[] = {

  93.     AVCOL_PRI_BT709,

  94.     AVCOL_PRI_SMPTE170M,

  95.     AVCOL_PRI_BT470BG,

  96. };

  97. 

  98. static const struct {

  99.     enum AVColorPrimaries color_primaries;

  100.     enum AVColorSpace colorspace;

  101.     enum AVColorTransferCharacteristic color_trc;

  102. } dirac_color_presets[] = {

  103.     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },

  104.     { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },

  105.     { AVCOL_PRI_BT470BG,   AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },

  106.     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },

  107.     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_UNSPECIFIED /* DCinema */ },

  108. };

  109. 

  110. /* [DIRAC_STD] Table 10.2 Supported chroma sampling formats + luma Offset */

  111. static const enum AVPixelFormat dirac_pix_fmt[2][3] = {

  112.     { AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P  },

  113.     { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P },

  114. };

  115. 

  116. /* [DIRAC_STD] 10.3 Parse Source Parameters.

  117.  * source_parameters(base_video_format) */

  118. static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,

  119.                                    dirac_source_params *source)

  120. {

  121.     AVRational frame_rate = {0,0};

  122.     unsigned luma_depth = 8, luma_offset = 16;

  123.     int idx;

  124. 

  125.     /* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */

  126.     /* [DIRAC_STD] custom_dimensions_flag */

  127.     if (get_bits1(gb)) {

  128.         source->width  = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH  */

  129.         source->height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */

  130.     }

  131. 

  132.     /* [DIRAC_STD] 10.3.3 Chroma Sampling Format.

  133.      *  chroma_sampling_format(video_params) */

  134.     /* [DIRAC_STD] custom_chroma_format_flag */

  135.     if (get_bits1(gb))

  136.         /* [DIRAC_STD] CHROMA_FORMAT_INDEX */

  137.         source->chroma_format = svq3_get_ue_golomb(gb);

  138.     if (source->chroma_format > 2) {

  139.         av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",

  140.                source->chroma_format);

  141.         return AVERROR_INVALIDDATA;

  142.     }

  143. 

  144.     /* [DIRAC_STD] 10.3.4 Scan Format. scan_format(video_params) */

  145.     /* [DIRAC_STD] custom_scan_format_flag */

  146.     if (get_bits1(gb))

  147.         /* [DIRAC_STD] SOURCE_SAMPLING */

  148.         source->interlaced = svq3_get_ue_golomb(gb);

  149.     if (source->interlaced > 1)

  150.         return AVERROR_INVALIDDATA;

  151. 

  152.     /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */

  153.     if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */

  154.         source->frame_rate_index = svq3_get_ue_golomb(gb);

  155. 

  156.         if (source->frame_rate_index > 10)

  157.             return AVERROR_INVALIDDATA;

  158. 

  159.         if (!source->frame_rate_index) {

  160.             /* [DIRAC_STD] FRAME_RATE_NUMER */

  161.             frame_rate.num = svq3_get_ue_golomb(gb);

  162.             /* [DIRAC_STD] FRAME_RATE_DENOM */

  163.             frame_rate.den = svq3_get_ue_golomb(gb);

  164.         }

  165.     }

  166.     /* [DIRAC_STD] preset_frame_rate(video_params, index) */

  167.     if (source->frame_rate_index > 0) {

  168.         if (source->frame_rate_index <= 8)

  169.             frame_rate = ff_mpeg12_frame_rate_tab[source->frame_rate_index];

  170.         else

  171.              /* [DIRAC_STD] Table 10.3 values 9-10 */

  172.             frame_rate = dirac_frame_rate[source->frame_rate_index-9];

  173.     }

  174.     av_reduce(&avctx->time_base.num, &avctx->time_base.den,

  175.               frame_rate.den, frame_rate.num, 1<<30);

  176. 

  177.     /* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio.

  178.      * pixel_aspect_ratio(video_params) */

  179.     if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */

  180.          /* [DIRAC_STD] index */

  181.         source->aspect_ratio_index = svq3_get_ue_golomb(gb);

  182. 

  183.         if (source->aspect_ratio_index > 6)

  184.             return AVERROR_INVALIDDATA;

  185. 

  186.         if (!source->aspect_ratio_index) {

  187.             avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb);

  188.             avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb);

  189.         }

  190.     }

  191.     /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel

  192.      *  aspect ratio values */

  193.     if (source->aspect_ratio_index > 0)

  194.         avctx->sample_aspect_ratio =

  195.                 dirac_preset_aspect_ratios[source->aspect_ratio_index-1];

  196. 

  197.     /* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */

  198.     if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */

  199.         /* [DIRAC_STD] CLEAN_WIDTH */

  200.         source->clean_width        = svq3_get_ue_golomb(gb);

  201.          /* [DIRAC_STD] CLEAN_HEIGHT */

  202.         source->clean_height       = svq3_get_ue_golomb(gb);

  203.          /* [DIRAC_STD] CLEAN_LEFT_OFFSET */

  204.         source->clean_left_offset  = svq3_get_ue_golomb(gb);

  205.         /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */

  206.         source->clean_right_offset = svq3_get_ue_golomb(gb);

  207.     }

  208. 

  209.     /* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params)

  210.      * WARNING: Some adaptation seems to be done using the

  211.      * AVCOL_RANGE_MPEG/JPEG values */

  212.     if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */

  213.         /* [DIRAC_STD] index */

  214.         source->pixel_range_index = svq3_get_ue_golomb(gb);

  215. 

  216.         if (source->pixel_range_index > 4)

  217.             return AVERROR_INVALIDDATA;

  218. 

  219.         // This assumes either fullrange or MPEG levels only

  220.         if (!source->pixel_range_index) {

  221.             luma_offset = svq3_get_ue_golomb(gb);

  222.             luma_depth  = av_log2(svq3_get_ue_golomb(gb))+1;

  223.             svq3_get_ue_golomb(gb); /* chroma offset    */

  224.             svq3_get_ue_golomb(gb); /* chroma excursion */

  225.             avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;

  226.         }

  227.     }

  228.     /* [DIRAC_STD] Table 10.5

  229.      * Available signal range presets <--> pixel_range_presets */

  230.     if (source->pixel_range_index > 0) {

  231.         idx                = source->pixel_range_index-1;

  232.         luma_depth         = pixel_range_presets[idx].bitdepth;

  233.         avctx->color_range = pixel_range_presets[idx].color_range;

  234.     }

  235. 

  236.     if (luma_depth > 8)

  237.         av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8");

  238. 

  239.     avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format];

  240. 

  241.     /* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */

  242.     if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */

  243.          /* [DIRAC_STD] index */

  244.         idx = source->color_spec_index = svq3_get_ue_golomb(gb);

  245. 

  246.         if (source->color_spec_index > 4)

  247.             return AVERROR_INVALIDDATA;

  248. 

  249.         avctx->color_primaries = dirac_color_presets[idx].color_primaries;

  250.         avctx->colorspace      = dirac_color_presets[idx].colorspace;

  251.         avctx->color_trc       = dirac_color_presets[idx].color_trc;

  252. 

  253.         if (!source->color_spec_index) {

  254.             /* [DIRAC_STD] 10.3.9.1 Colour primaries */

  255.             if (get_bits1(gb)) {

  256.                 idx = svq3_get_ue_golomb(gb);

  257.                 if (idx < 3)

  258.                     avctx->color_primaries = dirac_primaries[idx];

  259.             }

  260.             /* [DIRAC_STD] 10.3.9.2 Colour matrix */

  261.             if (get_bits1(gb)) {

  262.                 idx = svq3_get_ue_golomb(gb);

  263.                 if (!idx)

  264.                     avctx->colorspace = AVCOL_SPC_BT709;

  265.                 else if (idx == 1)

  266.                     avctx->colorspace = AVCOL_SPC_BT470BG;

  267.             }

  268.             /* [DIRAC_STD] 10.3.9.3 Transfer function */

  269.             if (get_bits1(gb) && !svq3_get_ue_golomb(gb))

  270.                 avctx->color_trc = AVCOL_TRC_BT709;

  271.         }

  272.     } else {

  273.         idx = source->color_spec_index;

  274.         avctx->color_primaries = dirac_color_presets[idx].color_primaries;

  275.         avctx->colorspace      = dirac_color_presets[idx].colorspace;

  276.         avctx->color_trc       = dirac_color_presets[idx].color_trc;

  277.     }

  278. 

  279.     return 0;

  280. }

  281. 

  282. /* [DIRAC_STD] 10. Sequence Header. sequence_header() */

  283. int avpriv_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,

  284.                                    dirac_source_params *source)

  285. {

  286.     unsigned version_major;

  287.     unsigned video_format, picture_coding_mode;

  288.     int ret;

  289. 

  290.     /* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */

  291.     version_major  = svq3_get_ue_golomb(gb);

  292.     svq3_get_ue_golomb(gb); /* version_minor */

  293.     avctx->profile = svq3_get_ue_golomb(gb);

  294.     avctx->level   = svq3_get_ue_golomb(gb);

  295.     /* [DIRAC_SPEC] sequence_header() -> base_video_format as defined in

  296.      * 10.2 Base Video Format, table 10.1 Dirac predefined video formats */

  297.     video_format   = svq3_get_ue_golomb(gb);

  298. 

  299.     if (version_major < 2)

  300.         av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n");

  301.     else if (version_major > 2)

  302.         av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n");

  303. 

  304.     if (video_format > 20)

  305.         return AVERROR_INVALIDDATA;

  306. 

  307.     // Fill in defaults for the source parameters.

  308.     *source = dirac_source_parameters_defaults[video_format];

  309. 

  310.     /* [DIRAC_STD] 10.3 Source Parameters

  311.      * Override the defaults. */

  312.     if (ret = parse_source_parameters(avctx, gb, source))

  313.         return ret;

  314. 

  315.     ret = ff_set_dimensions(avctx, source->width, source->height);

  316.     if (ret < 0)

  317.         return ret;

  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. }