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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. 

  30. #include "avcodec.h"

  31. #include "dirac.h"

  32. #include "golomb.h"

  33. #include "internal.h"

  34. #include "mpeg12data.h"

  35. 

  36. // defaults for source parameters

  37. static const dirac_source_params dirac_source_parameters_defaults[] = {

  38.     {  640,  480, 2, 0, 0,  1, 1,  640,  480, 0, 0, 1, 0 },

  39.     {  176,  120, 2, 0, 0,  9, 2,  176,  120, 0, 0, 1, 1 },

  40.     {  176,  144, 2, 0, 1, 10, 3,  176,  144, 0, 0, 1, 2 },

  41.     {  352,  240, 2, 0, 0,  9, 2,  352,  240, 0, 0, 1, 1 },

  42.     {  352,  288, 2, 0, 1, 10, 3,  352,  288, 0, 0, 1, 2 },

  43.     {  704,  480, 2, 0, 0,  9, 2,  704,  480, 0, 0, 1, 1 },

  44.     {  704,  576, 2, 0, 1, 10, 3,  704,  576, 0, 0, 1, 2 },

  45.     {  720,  480, 1, 1, 0,  4, 2,  704,  480, 8, 0, 3, 1 },

  46.     {  720,  576, 1, 1, 1,  3, 3,  704,  576, 8, 0, 3, 2 },

  47. 

  48.     { 1280,  720, 1, 0, 1,  7, 1, 1280,  720, 0, 0, 3, 3 },

  49.     { 1280,  720, 1, 0, 1,  6, 1, 1280,  720, 0, 0, 3, 3 },

  50.     { 1920, 1080, 1, 1, 1,  4, 1, 1920, 1080, 0, 0, 3, 3 },

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

  52.     { 1920, 1080, 1, 0, 1,  7, 1, 1920, 1080, 0, 0, 3, 3 },

  53.     { 1920, 1080, 1, 0, 1,  6, 1, 1920, 1080, 0, 0, 3, 3 },

  54.     { 2048, 1080, 0, 0, 1,  2, 1, 2048, 1080, 0, 0, 4, 4 },

  55.     { 4096, 2160, 0, 0, 1,  2, 1, 4096, 2160, 0, 0, 4, 4 },

  56. 

  57.     { 3840, 2160, 1, 0, 1,  7, 1, 3840, 2160, 0, 0, 3, 3 },

  58.     { 3840, 2160, 1, 0, 1,  6, 1, 3840, 2160, 0, 0, 3, 3 },

  59.     { 7680, 4320, 1, 0, 1,  7, 1, 3840, 2160, 0, 0, 3, 3 },

  60.     { 7680, 4320, 1, 0, 1,  6, 1, 3840, 2160, 0, 0, 3, 3 },

  61. };

  62. 

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

  64. static const AVRational dirac_preset_aspect_ratios[] = {

  65.     {  1,  1 },

  66.     { 10, 11 },

  67.     { 12, 11 },

  68.     { 40, 33 },

  69.     { 16, 11 },

  70.     {  4,  3 },

  71. };

  72. 

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

  74.  * Table 10.3 Available preset frame rate values

  75.  */

  76. static const AVRational dirac_frame_rate[] = {

  77.     { 15000, 1001 },

  78.     {    25,    2 },

  79. };

  80. 

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

  82.  * range presets */

  83. static const struct {

  84.     uint8_t             bitdepth;

  85.     enum AVColorRange   color_range;

  86. } pixel_range_presets[] = {

  87.     {  8, AVCOL_RANGE_JPEG },

  88.     {  8, AVCOL_RANGE_MPEG },

  89.     { 10, AVCOL_RANGE_MPEG },

  90.     { 12, AVCOL_RANGE_MPEG },

  91. };

  92. 

  93. static const enum AVColorPrimaries dirac_primaries[] = {

  94.     AVCOL_PRI_BT709,

  95.     AVCOL_PRI_SMPTE170M,

  96.     AVCOL_PRI_BT470BG,

  97. };

  98. 

  99. static const struct {

  100.     enum AVColorPrimaries color_primaries;

  101.     enum AVColorSpace colorspace;

  102.     enum AVColorTransferCharacteristic color_trc;

  103. } dirac_color_presets[] = {

  104.     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },

  105.     { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },

  106.     { AVCOL_PRI_BT470BG,   AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },

  107.     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },

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

  109. };

  110. 

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

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

  113.     { AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P  },

  114.     { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P },

  115. };

  116. 

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

  118.  * source_parameters(base_video_format) */

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

  120.                                    dirac_source_params *source)

  121. {

  122.     AVRational frame_rate = { 0, 0 };

  123.     unsigned luma_depth = 8, luma_offset = 16;

  124.     int idx;

  125. 

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

  127.     /* [DIRAC_STD] custom_dimensions_flag */

  128.     if (get_bits1(gb)) {

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

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

  131.     }

  132. 

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

  134.      *  chroma_sampling_format(video_params) */

  135.     /* [DIRAC_STD] custom_chroma_format_flag */

  136.     if (get_bits1(gb))

  137.         /* [DIRAC_STD] CHROMA_FORMAT_INDEX */

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

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

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

  141.                source->chroma_format);

  142.         return AVERROR_INVALIDDATA;

  143.     }

  144. 

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

  146.     /* [DIRAC_STD] custom_scan_format_flag */

  147.     if (get_bits1(gb))

  148.         /* [DIRAC_STD] SOURCE_SAMPLING */

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

  150.     if (source->interlaced > 1)

  151.         return AVERROR_INVALIDDATA;

  152. 

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

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

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

  156. 

  157.         if (source->frame_rate_index > 10)

  158.             return AVERROR_INVALIDDATA;

  159. 

  160.         if (!source->frame_rate_index) {

  161.             /* [DIRAC_STD] FRAME_RATE_NUMER */

  162.             frame_rate.num = svq3_get_ue_golomb(gb);

  163.             /* [DIRAC_STD] FRAME_RATE_DENOM */

  164.             frame_rate.den = svq3_get_ue_golomb(gb);

  165.         }

  166.     }

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

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

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

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

  171.         else

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

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

  174.     }

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

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

  177. 

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

  179.      * pixel_aspect_ratio(video_params) */

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

  181.         /* [DIRAC_STD] index */

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

  183. 

  184.         if (source->aspect_ratio_index > 6)

  185.             return AVERROR_INVALIDDATA;

  186. 

  187.         if (!source->aspect_ratio_index) {

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

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

  190.         }

  191.     }

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

  193.      *  aspect ratio values */

  194.     if (source->aspect_ratio_index > 0)

  195.         avctx->sample_aspect_ratio =

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

  197. 

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

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

  200.         /* [DIRAC_STD] CLEAN_WIDTH */

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

  202.         /* [DIRAC_STD] CLEAN_HEIGHT */

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

  204.         /* [DIRAC_STD] CLEAN_LEFT_OFFSET */

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

  206.         /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */

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

  208.     }

  209. 

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

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

  212.      * AVCOL_RANGE_MPEG/JPEG values */

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

  214.         /* [DIRAC_STD] index */

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

  216. 

  217.         if (source->pixel_range_index > 4)

  218.             return AVERROR_INVALIDDATA;

  219. 

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

  221.         if (!source->pixel_range_index) {

  222.             luma_offset = svq3_get_ue_golomb(gb);

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

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

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

  226.             avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG

  227.                                              : AVCOL_RANGE_JPEG;

  228.         }

  229.     }

  230.     /* [DIRAC_STD] Table 10.5

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

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

  233.         idx                = source->pixel_range_index - 1;

  234.         luma_depth         = pixel_range_presets[idx].bitdepth;

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

  236.     }

  237. 

  238.     if (luma_depth > 8)

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

  240. 

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

  242. 

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

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

  245.         /* [DIRAC_STD] index */

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

  247. 

  248.         if (source->color_spec_index > 4)

  249.             return AVERROR_INVALIDDATA;

  250. 

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

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

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

  254. 

  255.         if (!source->color_spec_index) {

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

  257.             if (get_bits1(gb)) {

  258.                 idx = svq3_get_ue_golomb(gb);

  259.                 if (idx < 3)

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

  261.             }

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

  263.             if (get_bits1(gb)) {

  264.                 idx = svq3_get_ue_golomb(gb);

  265.                 if (!idx)

  266.                     avctx->colorspace = AVCOL_SPC_BT709;

  267.                 else if (idx == 1)

  268.                     avctx->colorspace = AVCOL_SPC_BT470BG;

  269.             }

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

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

  272.                 avctx->color_trc = AVCOL_TRC_BT709;

  273.         }

  274.     } else {

  275.         idx                    = source->color_spec_index;

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

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

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

  279.     }

  280. 

  281.     return 0;

  282. }

  283. 

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

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

  286.                                        dirac_source_params *source)

  287. {

  288.     unsigned version_major;

  289.     unsigned video_format, picture_coding_mode;

  290.     int ret;

  291. 

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

  293.     version_major  = svq3_get_ue_golomb(gb);

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

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

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

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

  298.      * 10.2 Base Video Format, table 10.1 Dirac predefined video formats */

  299.     video_format   = svq3_get_ue_golomb(gb);

  300. 

  301.     if (version_major < 2)

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

  303.     else if (version_major > 2)

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

  305. 

  306.     if (video_format > 20)

  307.         return AVERROR_INVALIDDATA;

  308. 

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

  310.     *source = dirac_source_parameters_defaults[video_format];

  311. 

  312.     /* [DIRAC_STD] 10.3 Source Parameters

  313.      * Override the defaults. */

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

  315.         return ret;

  316. 

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

  318.     if (ret < 0)

  319.         return ret;

  320. 

  321.     ff_set_sar(avctx, avctx->sample_aspect_ratio);

  322. 

  323.     /* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames

  324.      * currently only used to signal field coding */

  325.     picture_coding_mode = svq3_get_ue_golomb(gb);

  326.     if (picture_coding_mode != 0) {

  327.         av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",

  328.                picture_coding_mode);

  329.         return AVERROR_INVALIDDATA;

  330.     }

  331.     return 0;

  332. }