/*
  * Copyright (c) 2016 Google Inc.
  * Copyright (c) 2016 KongQun Yang (kqyang@google.com)
  *
  * 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
  */
 
 #include "libavutil/pixdesc.h"
 #include "libavutil/pixfmt.h"
 #include "vpcc.h"
 
 enum VPX_CHROMA_SUBSAMPLING
 {
     VPX_SUBSAMPLING_420_VERTICAL = 0,
     VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA = 1,
     VPX_SUBSAMPLING_422 = 2,
     VPX_SUBSAMPLING_444 = 3,
 };
 
 static int get_vpx_chroma_subsampling(AVFormatContext *s,
                                       enum AVPixelFormat pixel_format,
                                       enum AVChromaLocation chroma_location)
 {
     int chroma_w, chroma_h;
     if (av_pix_fmt_get_chroma_sub_sample(pixel_format, &chroma_w, &chroma_h) == 0) {
         if (chroma_w == 1 && chroma_h == 1) {
             return (chroma_location == AVCHROMA_LOC_LEFT)
                        ? VPX_SUBSAMPLING_420_VERTICAL
                        : VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA;
         } else if (chroma_w == 1 && chroma_h == 0) {
             return VPX_SUBSAMPLING_422;
         } else if (chroma_w == 0 && chroma_h == 0) {
             return VPX_SUBSAMPLING_444;
         }
     }
     av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n", pixel_format);
     return -1;
 }
 
 static int get_bit_depth(AVFormatContext *s, enum AVPixelFormat pixel_format)
 {
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pixel_format);
     if (desc == NULL) {
         av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n",
                pixel_format);
         return -1;
     }
     return desc->comp[0].depth;
 }
 
 static int get_vpx_video_full_range_flag(enum AVColorRange color_range)
 {
     return color_range == AVCOL_RANGE_JPEG;
 }
 
 int ff_isom_write_vpcc(AVFormatContext *s, AVIOContext *pb,
                        AVCodecParameters *par)
 {
     int profile = par->profile;
     int level = par->level == FF_LEVEL_UNKNOWN ? 0 : par->level;
     int bit_depth = get_bit_depth(s, par->format);
     int vpx_chroma_subsampling =
         get_vpx_chroma_subsampling(s, par->format, par->chroma_location);
     int vpx_video_full_range_flag =
         get_vpx_video_full_range_flag(par->color_range);
 

     if (bit_depth < 0 || vpx_chroma_subsampling < 0)

         return AVERROR_INVALIDDATA;
 
     if (profile == FF_PROFILE_UNKNOWN) {
         if (vpx_chroma_subsampling == VPX_SUBSAMPLING_420_VERTICAL ||
             vpx_chroma_subsampling == VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA) {
             profile = (bit_depth == 8) ? FF_PROFILE_VP9_0 : FF_PROFILE_VP9_2;
         } else {
             profile = (bit_depth == 8) ? FF_PROFILE_VP9_1 : FF_PROFILE_VP9_3;
         }
     }
 
     avio_w8(pb, profile);
     avio_w8(pb, level);

     avio_w8(pb, (bit_depth << 4) | (vpx_chroma_subsampling << 1) | vpx_video_full_range_flag);
     avio_w8(pb, par->color_primaries);
     avio_w8(pb, par->color_trc);
     avio_w8(pb, par->color_space);

 
     // vp9 does not have codec initialization data.
     avio_wb16(pb, 0);
     return 0;
 }