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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.  * Copyright (C) 2011 Jordi Ortiz

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * Dirac Decoder

  26.  * @author Marco Gerards <marco@gnu.org>, David Conrad, Jordi Ortiz <nenjordi@gmail.com>

  27.  */

  28. 

  29. #include "libavutil/imgutils.h"

  30. 

  31. #include "avcodec.h"

  32. #include "dirac.h"

  33. #include "golomb.h"

  34. #include "internal.h"

  35. #include "mpeg12data.h"

  36. 

  37. /* defaults for source parameters */

  38. static const dirac_source_params dirac_source_parameters_defaults[] = {

  39.     {  640,  480, 2, 0, 0,  1, 1,  640,  480, 0, 0, 1, 0 },

  40.     {  176,  120, 2, 0, 0,  9, 2,  176,  120, 0, 0, 1, 1 },

  41.     {  176,  144, 2, 0, 1, 10, 3,  176,  144, 0, 0, 1, 2 },

  42.     {  352,  240, 2, 0, 0,  9, 2,  352,  240, 0, 0, 1, 1 },

  43.     {  352,  288, 2, 0, 1, 10, 3,  352,  288, 0, 0, 1, 2 },

  44.     {  704,  480, 2, 0, 0,  9, 2,  704,  480, 0, 0, 1, 1 },

  45.     {  704,  576, 2, 0, 1, 10, 3,  704,  576, 0, 0, 1, 2 },

  46.     {  720,  480, 1, 1, 0,  4, 2,  704,  480, 8, 0, 3, 1 },

  47.     {  720,  576, 1, 1, 1,  3, 3,  704,  576, 8, 0, 3, 2 },

  48. 

  49.     { 1280,  720, 1, 0, 1,  7, 1, 1280,  720, 0, 0, 3, 3 },

  50.     { 1280,  720, 1, 0, 1,  6, 1, 1280,  720, 0, 0, 3, 3 },

  51.     { 1920, 1080, 1, 1, 1,  4, 1, 1920, 1080, 0, 0, 3, 3 },

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

  53.     { 1920, 1080, 1, 0, 1,  7, 1, 1920, 1080, 0, 0, 3, 3 },

  54.     { 1920, 1080, 1, 0, 1,  6, 1, 1920, 1080, 0, 0, 3, 3 },

  55.     { 2048, 1080, 0, 0, 1,  2, 1, 2048, 1080, 0, 0, 4, 4 },

  56.     { 4096, 2160, 0, 0, 1,  2, 1, 4096, 2160, 0, 0, 4, 4 },

  57. 

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

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

  60.     { 7680, 4320, 1, 0, 1,  7, 1, 3840, 2160, 0, 0, 3, 3 },

  61.     { 7680, 4320, 1, 0, 1,  6, 1, 3840, 2160, 0, 0, 3, 3 },

  62. };

  63. 

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

  65. static const AVRational dirac_preset_aspect_ratios[] = {

  66.     {  1,  1 },

  67.     { 10, 11 },

  68.     { 12, 11 },

  69.     { 40, 33 },

  70.     { 16, 11 },

  71.     {  4,  3 },

  72. };

  73. 

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

  75.  * Table 10.3 Available preset frame rate values

  76.  */

  77. static const AVRational dirac_frame_rate[] = {

  78.     { 15000, 1001 },

  79.     {    25,    2 },

  80. };

  81. 

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

  83.  * range presets */

  84. static const struct {

  85.     uint8_t             bitdepth;

  86.     enum AVColorRange   color_range;

  87. } pixel_range_presets[] = {

  88.     {  8, AVCOL_RANGE_JPEG },

  89.     {  8, AVCOL_RANGE_MPEG },

  90.     { 10, AVCOL_RANGE_MPEG },

  91.     { 12, AVCOL_RANGE_MPEG },

  92. };

  93. 

  94. static const enum AVColorPrimaries dirac_primaries[] = {

  95.     AVCOL_PRI_BT709,

  96.     AVCOL_PRI_SMPTE170M,

  97.     AVCOL_PRI_BT470BG,

  98. };

  99. 

  100. static const struct {

  101.     enum AVColorPrimaries color_primaries;

  102.     enum AVColorSpace colorspace;

  103.     enum AVColorTransferCharacteristic color_trc;

  104. } dirac_color_presets[] = {

  105.     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },

  106.     { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },

  107.     { AVCOL_PRI_BT470BG,   AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },

  108.     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },

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

  110. };

  111. 

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

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

  114.     { AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P  },

  115.     { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P },

  116. };

  117. 

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

  119.  * source_parameters(base_video_format) */

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

  121.                                    dirac_source_params *source)

  122. {

  123.     AVRational frame_rate = { 0, 0 };

  124.     unsigned luma_depth = 8, luma_offset = 16;

  125.     int idx;

  126.     int chroma_x_shift, chroma_y_shift;

  127. 

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

  129.     /* [DIRAC_STD] custom_dimensions_flag */

  130.     if (get_bits1(gb)) {

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

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

  133.     }

  134. 

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

  136.      *  chroma_sampling_format(video_params) */

  137.     /* [DIRAC_STD] custom_chroma_format_flag */

  138.     if (get_bits1(gb))

  139.         /* [DIRAC_STD] CHROMA_FORMAT_INDEX */

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

  141.     if (source->chroma_format > 2U) {

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

  143.                source->chroma_format);

  144.         return AVERROR_INVALIDDATA;

  145.     }

  146. 

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

  148.     /* [DIRAC_STD] custom_scan_format_flag */

  149.     if (get_bits1(gb))

  150.         /* [DIRAC_STD] SOURCE_SAMPLING */

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

  152.     if (source->interlaced > 1U)

  153.         return AVERROR_INVALIDDATA;

  154. 

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

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

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

  158. 

  159.         if (source->frame_rate_index > 10U)

  160.             return AVERROR_INVALIDDATA;

  161. 

  162.         if (!source->frame_rate_index) {

  163.             /* [DIRAC_STD] FRAME_RATE_NUMER */

  164.             frame_rate.num = svq3_get_ue_golomb(gb);

  165.             /* [DIRAC_STD] FRAME_RATE_DENOM */

  166.             frame_rate.den = svq3_get_ue_golomb(gb);

  167.         }

  168.     }

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

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

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

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

  173.         else

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

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

  176.     }

  177.     avctx->framerate = frame_rate;

  178. 

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

  180.      * pixel_aspect_ratio(video_params) */

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

  182.         /* [DIRAC_STD] index */

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

  184. 

  185.         if (source->aspect_ratio_index > 6U)

  186.             return AVERROR_INVALIDDATA;

  187. 

  188.         if (!source->aspect_ratio_index) {

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

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

  191.         }

  192.     }

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

  194.      *  aspect ratio values */

  195.     if (source->aspect_ratio_index > 0)

  196.         avctx->sample_aspect_ratio =

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

  198. 

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

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

  201.         /* [DIRAC_STD] CLEAN_WIDTH */

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

  203.         /* [DIRAC_STD] CLEAN_HEIGHT */

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

  205.         /* [DIRAC_STD] CLEAN_LEFT_OFFSET */

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

  207.         /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */

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

  209.     }

  210. 

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

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

  213.      * AVCOL_RANGE_MPEG/JPEG values */

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

  215.         /* [DIRAC_STD] index */

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

  217. 

  218.         if (source->pixel_range_index > 4U)

  219.             return AVERROR_INVALIDDATA;

  220. 

  221.         /* This assumes either fullrange or MPEG levels only */

  222.         if (!source->pixel_range_index) {

  223.             luma_offset = svq3_get_ue_golomb(gb);

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

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

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

  227.             avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG

  228.                                              : AVCOL_RANGE_JPEG;

  229.         }

  230.     }

  231.     /* [DIRAC_STD] Table 10.5

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

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

  234.         idx                = source->pixel_range_index - 1;

  235.         luma_depth         = pixel_range_presets[idx].bitdepth;

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

  237.     }

  238. 

  239.     if (luma_depth > 8)

  240.         av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8\n");

  241. 

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

  243.     avcodec_get_chroma_sub_sample(avctx->pix_fmt, &chroma_x_shift, &chroma_y_shift);

  244.     if ((source->width % (1<<chroma_x_shift)) || (source->height % (1<<chroma_y_shift))) {

  245.         av_log(avctx, AV_LOG_ERROR, "Dimensions must be an integer multiple of the chroma subsampling\n");

  246.         return AVERROR_INVALIDDATA;

  247.     }

  248. 

  249. 

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

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

  252.         /* [DIRAC_STD] index */

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

  254. 

  255.         if (source->color_spec_index > 4U)

  256.             return AVERROR_INVALIDDATA;

  257. 

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

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

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

  261. 

  262.         if (!source->color_spec_index) {

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

  264.             if (get_bits1(gb)) {

  265.                 idx = svq3_get_ue_golomb(gb);

  266.                 if (idx < 3U)

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

  268.             }

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

  270.             if (get_bits1(gb)) {

  271.                 idx = svq3_get_ue_golomb(gb);

  272.                 if (!idx)

  273.                     avctx->colorspace = AVCOL_SPC_BT709;

  274.                 else if (idx == 1)

  275.                     avctx->colorspace = AVCOL_SPC_BT470BG;

  276.             }

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

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

  279.                 avctx->color_trc = AVCOL_TRC_BT709;

  280.         }

  281.     } else {

  282.         idx                    = source->color_spec_index;

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

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

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

  286.     }

  287. 

  288.     return 0;

  289. }

  290. 

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

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

  293.                                        dirac_source_params *source)

  294. {

  295.     unsigned version_major;

  296.     unsigned video_format, picture_coding_mode;

  297.     int ret;

  298. 

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

  300.     version_major  = svq3_get_ue_golomb(gb);

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

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

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

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

  305.      * 10.2 Base Video Format, table 10.1 Dirac predefined video formats */

  306.     video_format   = svq3_get_ue_golomb(gb);

  307. 

  308.     if (version_major < 2)

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

  310.     else if (version_major > 2)

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

  312. 

  313.     if (video_format > 20U)

  314.         return AVERROR_INVALIDDATA;

  315. 

  316.     /* Fill in defaults for the source parameters. */

  317.     *source = dirac_source_parameters_defaults[video_format];

  318. 

  319.     /* [DIRAC_STD] 10.3 Source Parameters

  320.      * Override the defaults. */

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

  322.         return ret;

  323. 

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

  325.     if (ret < 0)

  326.         return ret;

  327. 

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

  329. 

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

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

  332.     picture_coding_mode = svq3_get_ue_golomb(gb);

  333.     if (picture_coding_mode != 0) {

  334.         av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d\n",

  335.                picture_coding_mode);

  336.         return AVERROR_INVALIDDATA;

  337.     }

  338.     return 0;

  339. }