/*
  * Copyright (C) 2007 Marco Gerards <marco@gnu.org>
  * Copyright (C) 2009 David Conrad

  * Copyright (C) 2011 Jordi Ortiz

  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**

  * @file

  * Dirac Decoder

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

  */
 

 #include "libavutil/imgutils.h"

 #include "avcodec.h"

 #include "dirac.h"

 #include "golomb.h"

 #include "internal.h"

 #include "mpeg12data.h"
 

 /* defaults for source parameters */

 static const dirac_source_params dirac_source_parameters_defaults[] = {

     {  640,  480, 2, 0, 0,  1, 1,  640,  480, 0, 0, 1, 0 },
     {  176,  120, 2, 0, 0,  9, 2,  176,  120, 0, 0, 1, 1 },
     {  176,  144, 2, 0, 1, 10, 3,  176,  144, 0, 0, 1, 2 },
     {  352,  240, 2, 0, 0,  9, 2,  352,  240, 0, 0, 1, 1 },
     {  352,  288, 2, 0, 1, 10, 3,  352,  288, 0, 0, 1, 2 },
     {  704,  480, 2, 0, 0,  9, 2,  704,  480, 0, 0, 1, 1 },
     {  704,  576, 2, 0, 1, 10, 3,  704,  576, 0, 0, 1, 2 },
     {  720,  480, 1, 1, 0,  4, 2,  704,  480, 8, 0, 3, 1 },
     {  720,  576, 1, 1, 1,  3, 3,  704,  576, 8, 0, 3, 2 },
 
     { 1280,  720, 1, 0, 1,  7, 1, 1280,  720, 0, 0, 3, 3 },
     { 1280,  720, 1, 0, 1,  6, 1, 1280,  720, 0, 0, 3, 3 },
     { 1920, 1080, 1, 1, 1,  4, 1, 1920, 1080, 0, 0, 3, 3 },
     { 1920, 1080, 1, 1, 1,  3, 1, 1920, 1080, 0, 0, 3, 3 },
     { 1920, 1080, 1, 0, 1,  7, 1, 1920, 1080, 0, 0, 3, 3 },
     { 1920, 1080, 1, 0, 1,  6, 1, 1920, 1080, 0, 0, 3, 3 },
     { 2048, 1080, 0, 0, 1,  2, 1, 2048, 1080, 0, 0, 4, 4 },
     { 4096, 2160, 0, 0, 1,  2, 1, 4096, 2160, 0, 0, 4, 4 },
 
     { 3840, 2160, 1, 0, 1,  7, 1, 3840, 2160, 0, 0, 3, 3 },
     { 3840, 2160, 1, 0, 1,  6, 1, 3840, 2160, 0, 0, 3, 3 },
     { 7680, 4320, 1, 0, 1,  7, 1, 3840, 2160, 0, 0, 3, 3 },
     { 7680, 4320, 1, 0, 1,  6, 1, 3840, 2160, 0, 0, 3, 3 },

 };
 

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

 static const AVRational dirac_preset_aspect_ratios[] = {

     {  1,  1 },
     { 10, 11 },
     { 12, 11 },
     { 40, 33 },
     { 16, 11 },
     {  4,  3 },

 };
 

 /* [DIRAC_STD] Values 9,10 of 10.3.5 Frame Rate.
  * Table 10.3 Available preset frame rate values

  */

 static const AVRational dirac_frame_rate[] = {

     { 15000, 1001 },
     {    25,    2 },

 };
 

 /* [DIRAC_STD] This should be equivalent to Table 10.5 Available signal
  * range presets */

 static const struct {
     uint8_t             bitdepth;
     enum AVColorRange   color_range;
 } pixel_range_presets[] = {

     {  8, AVCOL_RANGE_JPEG },
     {  8, AVCOL_RANGE_MPEG },
     { 10, AVCOL_RANGE_MPEG },
     { 12, AVCOL_RANGE_MPEG },

 };
 
 static const enum AVColorPrimaries dirac_primaries[] = {
     AVCOL_PRI_BT709,
     AVCOL_PRI_SMPTE170M,
     AVCOL_PRI_BT470BG,
 };
 
 static const struct {
     enum AVColorPrimaries color_primaries;
     enum AVColorSpace colorspace;
     enum AVColorTransferCharacteristic color_trc;
 } dirac_color_presets[] = {
     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },
     { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
     { AVCOL_PRI_BT470BG,   AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },
     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_UNSPECIFIED /* DCinema */ },
 };
 

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

 static const enum AVPixelFormat dirac_pix_fmt[2][3] = {
     { AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P  },
     { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P },

 };
 

 /* [DIRAC_STD] 10.3 Parse Source Parameters.
  * source_parameters(base_video_format) */

 static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
                                    dirac_source_params *source)
 {

     AVRational frame_rate = { 0, 0 };

     unsigned luma_depth = 8, luma_offset = 16;
     int idx;

     int chroma_x_shift, chroma_y_shift;

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

     /* [DIRAC_STD] custom_dimensions_flag */

     if (get_bits1(gb)) {

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

     }
 

     /* [DIRAC_STD] 10.3.3 Chroma Sampling Format.

      *  chroma_sampling_format(video_params) */
     /* [DIRAC_STD] custom_chroma_format_flag */

     if (get_bits1(gb))

         /* [DIRAC_STD] CHROMA_FORMAT_INDEX */

         source->chroma_format = svq3_get_ue_golomb(gb);

     if (source->chroma_format > 2U) {

         av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
                source->chroma_format);

         return AVERROR_INVALIDDATA;

     }
 

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

     /* [DIRAC_STD] custom_scan_format_flag */

     if (get_bits1(gb))

         /* [DIRAC_STD] SOURCE_SAMPLING */

         source->interlaced = svq3_get_ue_golomb(gb);

     if (source->interlaced > 1U)

         return AVERROR_INVALIDDATA;

     /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */
     if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */
         source->frame_rate_index = svq3_get_ue_golomb(gb);

         if (source->frame_rate_index > 10U)

             return AVERROR_INVALIDDATA;

 
         if (!source->frame_rate_index) {

             /* [DIRAC_STD] FRAME_RATE_NUMER */

             frame_rate.num = svq3_get_ue_golomb(gb);

             /* [DIRAC_STD] FRAME_RATE_DENOM */

             frame_rate.den = svq3_get_ue_golomb(gb);
         }
     }

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

     if (source->frame_rate_index > 0) {
         if (source->frame_rate_index <= 8)

             frame_rate = ff_mpeg12_frame_rate_tab[source->frame_rate_index];

         else

             /* [DIRAC_STD] Table 10.3 values 9-10 */
             frame_rate = dirac_frame_rate[source->frame_rate_index - 9];

     }

     avctx->framerate = frame_rate;

     /* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio.
      * pixel_aspect_ratio(video_params) */

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

         /* [DIRAC_STD] index */

         source->aspect_ratio_index = svq3_get_ue_golomb(gb);
 

         if (source->aspect_ratio_index > 6U)

             return AVERROR_INVALIDDATA;

 
         if (!source->aspect_ratio_index) {
             avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb);
             avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb);
         }
     }

     /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel
      *  aspect ratio values */

     if (source->aspect_ratio_index > 0)
         avctx->sample_aspect_ratio =

             dirac_preset_aspect_ratios[source->aspect_ratio_index - 1];

 
     /* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */
     if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */

         /* [DIRAC_STD] CLEAN_WIDTH */

         source->clean_width = svq3_get_ue_golomb(gb);
         /* [DIRAC_STD] CLEAN_HEIGHT */
         source->clean_height = svq3_get_ue_golomb(gb);
         /* [DIRAC_STD] CLEAN_LEFT_OFFSET */
         source->clean_left_offset = svq3_get_ue_golomb(gb);

         /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */

         source->clean_right_offset = svq3_get_ue_golomb(gb);
     }
 

     /* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params)
      * WARNING: Some adaptation seems to be done using the
      * AVCOL_RANGE_MPEG/JPEG values */
     if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */
         /* [DIRAC_STD] index */

         source->pixel_range_index = svq3_get_ue_golomb(gb);
 

         if (source->pixel_range_index > 4U)

             return AVERROR_INVALIDDATA;

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

         if (!source->pixel_range_index) {
             luma_offset = svq3_get_ue_golomb(gb);

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

             svq3_get_ue_golomb(gb); /* chroma offset    */

             svq3_get_ue_golomb(gb); /* chroma excursion */

             avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG
                                              : AVCOL_RANGE_JPEG;

         }
     }

     /* [DIRAC_STD] Table 10.5
      * Available signal range presets <--> pixel_range_presets */

     if (source->pixel_range_index > 0) {

         idx                = source->pixel_range_index - 1;

         luma_depth         = pixel_range_presets[idx].bitdepth;
         avctx->color_range = pixel_range_presets[idx].color_range;
     }
 
     if (luma_depth > 8)

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

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

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

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

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

         return AVERROR_INVALIDDATA;
     }
 

     /* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */
     if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */

         /* [DIRAC_STD] index */

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

         if (source->color_spec_index > 4U)

             return AVERROR_INVALIDDATA;

 
         avctx->color_primaries = dirac_color_presets[idx].color_primaries;
         avctx->colorspace      = dirac_color_presets[idx].colorspace;
         avctx->color_trc       = dirac_color_presets[idx].color_trc;
 
         if (!source->color_spec_index) {

             /* [DIRAC_STD] 10.3.9.1 Colour primaries */

             if (get_bits1(gb)) {
                 idx = svq3_get_ue_golomb(gb);

                 if (idx < 3U)

                     avctx->color_primaries = dirac_primaries[idx];
             }

             /* [DIRAC_STD] 10.3.9.2 Colour matrix */

             if (get_bits1(gb)) {
                 idx = svq3_get_ue_golomb(gb);
                 if (!idx)
                     avctx->colorspace = AVCOL_SPC_BT709;
                 else if (idx == 1)
                     avctx->colorspace = AVCOL_SPC_BT470BG;
             }

             /* [DIRAC_STD] 10.3.9.3 Transfer function */

             if (get_bits1(gb) && !svq3_get_ue_golomb(gb))
                 avctx->color_trc = AVCOL_TRC_BT709;
         }
     } else {

         idx                    = source->color_spec_index;

         avctx->color_primaries = dirac_color_presets[idx].color_primaries;
         avctx->colorspace      = dirac_color_presets[idx].colorspace;
         avctx->color_trc       = dirac_color_presets[idx].color_trc;
     }
 
     return 0;
 }
 

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

 int avpriv_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,

                                        dirac_source_params *source)

 {

     unsigned version_major;

     unsigned video_format, picture_coding_mode;

     int ret;

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

     version_major  = svq3_get_ue_golomb(gb);

     svq3_get_ue_golomb(gb); /* version_minor */

     avctx->profile = svq3_get_ue_golomb(gb);
     avctx->level   = svq3_get_ue_golomb(gb);

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

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

     video_format   = svq3_get_ue_golomb(gb);
 
     if (version_major < 2)
         av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n");
     else if (version_major > 2)
         av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
 

     if (video_format > 20U)

         return AVERROR_INVALIDDATA;

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

     *source = dirac_source_parameters_defaults[video_format];
 

     /* [DIRAC_STD] 10.3 Source Parameters
      * Override the defaults. */

     if (ret = parse_source_parameters(avctx, gb, source))
         return ret;

     ret = ff_set_dimensions(avctx, source->width, source->height);
     if (ret < 0)

         return ret;

     ff_set_sar(avctx, avctx->sample_aspect_ratio);
 

     /* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames
      * currently only used to signal field coding */

     picture_coding_mode = svq3_get_ue_golomb(gb);
     if (picture_coding_mode != 0) {

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

                picture_coding_mode);

         return AVERROR_INVALIDDATA;

     }
     return 0;
 }