/*
  * 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"
 

 #if CONFIG_DIRAC_PARSE
 
 typedef struct dirac_source_params {
     unsigned width;
     unsigned height;
     uint8_t chroma_format;          ///< 0: 444  1: 422  2: 420
 
     uint8_t interlaced;
     uint8_t top_field_first;
 
     uint8_t frame_rate_index;       ///< index into dirac_frame_rate[]
     uint8_t aspect_ratio_index;     ///< index into dirac_aspect_ratio[]
 
     uint16_t clean_width;
     uint16_t clean_height;
     uint16_t clean_left_offset;
     uint16_t clean_right_offset;
 
     uint8_t pixel_range_index;      ///< index into dirac_pixel_range_presets[]
     uint8_t color_spec_index;       ///< index into dirac_color_spec_presets[]
 } dirac_source_params;
 

 /* 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 */
 static const enum AVPixelFormat dirac_pix_fmt[][3] = {
     {AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12},
     {AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12},
     {AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12},

 };
 

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

 static int parse_source_parameters(AVDiracSeqHeader *dsh, GetBitContext *gb,
                                    void *log_ctx)

 {

     AVRational frame_rate = { 0, 0 };

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

     int chroma_x_shift, chroma_y_shift;

     int ret;

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

     /* [DIRAC_STD] custom_dimensions_flag */

     if (get_bits1(gb)) {

         dsh->width  = get_interleaved_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH  */
         dsh->height = get_interleaved_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 */

         dsh->chroma_format = get_interleaved_ue_golomb(gb);

     if (dsh->chroma_format > 2U) {

         if (log_ctx)
             av_log(log_ctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
                    dsh->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 */

         dsh->interlaced = get_interleaved_ue_golomb(gb);

     if (dsh->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 */

         dsh->frame_rate_index = get_interleaved_ue_golomb(gb);

         if (dsh->frame_rate_index > 10U)

             return AVERROR_INVALIDDATA;

         if (!dsh->frame_rate_index) {

             /* [DIRAC_STD] FRAME_RATE_NUMER */

             frame_rate.num = get_interleaved_ue_golomb(gb);

             /* [DIRAC_STD] FRAME_RATE_DENOM */

             frame_rate.den = get_interleaved_ue_golomb(gb);

         }
     }

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

     if (dsh->frame_rate_index > 0) {
         if (dsh->frame_rate_index <= 8)
             frame_rate = ff_mpeg12_frame_rate_tab[dsh->frame_rate_index];

         else

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

             frame_rate = dirac_frame_rate[dsh->frame_rate_index - 9];

     }

     dsh->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 */

         dsh->aspect_ratio_index = get_interleaved_ue_golomb(gb);

         if (dsh->aspect_ratio_index > 6U)

             return AVERROR_INVALIDDATA;

         if (!dsh->aspect_ratio_index) {

             dsh->sample_aspect_ratio.num = get_interleaved_ue_golomb(gb);
             dsh->sample_aspect_ratio.den = get_interleaved_ue_golomb(gb);

         }
     }

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

     if (dsh->aspect_ratio_index > 0)
         dsh->sample_aspect_ratio =
             dirac_preset_aspect_ratios[dsh->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 */

         dsh->clean_width = get_interleaved_ue_golomb(gb);

         /* [DIRAC_STD] CLEAN_HEIGHT */

         dsh->clean_height = get_interleaved_ue_golomb(gb);

         /* [DIRAC_STD] CLEAN_LEFT_OFFSET */

         dsh->clean_left_offset = get_interleaved_ue_golomb(gb);

         /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */

         dsh->clean_right_offset = get_interleaved_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 */

         dsh->pixel_range_index = get_interleaved_ue_golomb(gb);

         if (dsh->pixel_range_index > 4U)

             return AVERROR_INVALIDDATA;

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

         if (!dsh->pixel_range_index) {

             luma_offset = get_interleaved_ue_golomb(gb);
             luma_depth  = av_log2(get_interleaved_ue_golomb(gb)) + 1;
             get_interleaved_ue_golomb(gb); /* chroma offset    */
             get_interleaved_ue_golomb(gb); /* chroma excursion */

             dsh->color_range = luma_offset ? AVCOL_RANGE_MPEG
                                            : AVCOL_RANGE_JPEG;

         }
     }

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

     if (dsh->pixel_range_index > 0) {
         idx                = dsh->pixel_range_index - 1;

         luma_depth         = pixel_range_presets[idx].bitdepth;

         dsh->color_range   = pixel_range_presets[idx].color_range;

     }
 

     dsh->bit_depth = luma_depth;

     /* Full range 8 bts uses the same pix_fmts as limited range 8 bits */
     dsh->pixel_range_index += dsh->pixel_range_index == 1;
 

     if (dsh->pixel_range_index < 2U)
         return AVERROR_INVALIDDATA;
 

     dsh->pix_fmt = dirac_pix_fmt[dsh->chroma_format][dsh->pixel_range_index-2];

     ret = av_pix_fmt_get_chroma_sub_sample(dsh->pix_fmt, &chroma_x_shift, &chroma_y_shift);
     if (ret)
         return ret;
 

     if ((dsh->width % (1<<chroma_x_shift)) || (dsh->height % (1<<chroma_y_shift))) {
         if (log_ctx)
             av_log(log_ctx, 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 = dsh->color_spec_index = get_interleaved_ue_golomb(gb);

         if (dsh->color_spec_index > 4U)

             return AVERROR_INVALIDDATA;

         dsh->color_primaries = dirac_color_presets[idx].color_primaries;
         dsh->colorspace      = dirac_color_presets[idx].colorspace;
         dsh->color_trc       = dirac_color_presets[idx].color_trc;

         if (!dsh->color_spec_index) {

             /* [DIRAC_STD] 10.3.9.1 Colour primaries */

             if (get_bits1(gb)) {

                 idx = get_interleaved_ue_golomb(gb);

                 if (idx < 3U)

                     dsh->color_primaries = dirac_primaries[idx];

             }

             /* [DIRAC_STD] 10.3.9.2 Colour matrix */

             if (get_bits1(gb)) {

                 idx = get_interleaved_ue_golomb(gb);

                 if (!idx)

                     dsh->colorspace = AVCOL_SPC_BT709;

                 else if (idx == 1)

                     dsh->colorspace = AVCOL_SPC_BT470BG;

             }

             /* [DIRAC_STD] 10.3.9.3 Transfer function */

             if (get_bits1(gb) && !get_interleaved_ue_golomb(gb))

                 dsh->color_trc = AVCOL_TRC_BT709;

         }
     } else {

         idx                    = dsh->color_spec_index;
         dsh->color_primaries = dirac_color_presets[idx].color_primaries;
         dsh->colorspace      = dirac_color_presets[idx].colorspace;
         dsh->color_trc       = dirac_color_presets[idx].color_trc;

     }
 
     return 0;
 }
 

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

 int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
                                    const uint8_t *buf, size_t buf_size,
                                    void *log_ctx)

 {

     AVDiracSeqHeader *dsh;
     GetBitContext gb;

     unsigned video_format, picture_coding_mode;

     int ret;

     dsh = av_mallocz(sizeof(*dsh));
     if (!dsh)
         return AVERROR(ENOMEM);
 
     ret = init_get_bits8(&gb, buf, buf_size);
     if (ret < 0)
         goto fail;
 

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

     dsh->version.major = get_interleaved_ue_golomb(&gb);
     dsh->version.minor = get_interleaved_ue_golomb(&gb);
     dsh->profile   = get_interleaved_ue_golomb(&gb);
     dsh->level     = get_interleaved_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 = get_interleaved_ue_golomb(&gb);

     if (dsh->version.major < 2 && log_ctx)
         av_log(log_ctx, AV_LOG_WARNING, "Stream is old and may not work\n");
     else if (dsh->version.major > 2 && log_ctx)
         av_log(log_ctx, AV_LOG_WARNING, "Stream may have unhandled features\n");

     if (video_format > 20U) {
         ret = AVERROR_INVALIDDATA;
         goto fail;
     }

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

     dsh->width              = dirac_source_parameters_defaults[video_format].width;
     dsh->height             = dirac_source_parameters_defaults[video_format].height;
     dsh->chroma_format      = dirac_source_parameters_defaults[video_format].chroma_format;
     dsh->interlaced         = dirac_source_parameters_defaults[video_format].interlaced;
     dsh->top_field_first    = dirac_source_parameters_defaults[video_format].top_field_first;
     dsh->frame_rate_index   = dirac_source_parameters_defaults[video_format].frame_rate_index;
     dsh->aspect_ratio_index = dirac_source_parameters_defaults[video_format].aspect_ratio_index;
     dsh->clean_width        = dirac_source_parameters_defaults[video_format].clean_width;
     dsh->clean_height       = dirac_source_parameters_defaults[video_format].clean_height;
     dsh->clean_left_offset  = dirac_source_parameters_defaults[video_format].clean_left_offset;
     dsh->clean_right_offset = dirac_source_parameters_defaults[video_format].clean_right_offset;
     dsh->pixel_range_index  = dirac_source_parameters_defaults[video_format].pixel_range_index;
     dsh->color_spec_index   = dirac_source_parameters_defaults[video_format].color_spec_index;

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

     ret = parse_source_parameters(dsh, &gb, log_ctx);

     if (ret < 0)

         goto fail;

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

     picture_coding_mode = get_interleaved_ue_golomb(&gb);

     if (picture_coding_mode != 0) {

         if (log_ctx) {
             av_log(log_ctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
                    picture_coding_mode);
         }
         ret = AVERROR_INVALIDDATA;
         goto fail;

     }

 
     *pdsh = dsh;

     return 0;

 fail:
     av_freep(&dsh);
     *pdsh = NULL;
     return ret;
 }
 #else
 int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
                                    const uint8_t *buf, size_t buf_size,
                                    void *log_ctx)
 {
     return AVERROR(ENOSYS);

 }

 #endif