text: /*
   * Copyright (c) 2010, Google, Inc.
   *
   * 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
   * VP8/9 decoder support via libvpx
   */
  
  #define VPX_CODEC_DISABLE_COMPAT 1
  #include <vpx/vpx_decoder.h>
  #include <vpx/vp8dx.h>
  
  #include "libavutil/common.h"
  #include "libavutil/imgutils.h"
  #include "libavutil/intreadwrite.h"
  #include "libavcodec/avcodec.h"
  #include "libavcodec/internal.h"
  #include "libavcodec/libvpx.h"
  #include "libavcodec/profiles.h"
  #include "libavutil/internal.h"
  
  #define CONFIG_LIBVPX_VP8_DECODER_VE 1
  #define CONFIG_LIBVPX_VP9_DECODER 0
  
  typedef struct VPxDecoderContext {
      struct vpx_codec_ctx decoder;
      struct vpx_codec_ctx decoder_alpha;
      int has_alpha_channel;
  } VPxContext;
  
  static av_cold int vpx_init(AVCodecContext *avctx,
                              const struct vpx_codec_iface *iface,
                              int is_alpha_decoder)
  {
      VPxContext *ctx = avctx->priv_data;
      struct vpx_codec_dec_cfg deccfg = {
          /* token partitions+1 would be a decent choice */
          .threads = FFMIN(avctx->thread_count, 16)
      };
  
      av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str());
      //av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config());
  
      if (vpx_codec_dec_init(
              is_alpha_decoder ? &ctx->decoder_alpha : &ctx->decoder,
              iface, &deccfg, 0) != VPX_CODEC_OK) {
          const char *error = vpx_codec_error(&ctx->decoder);
          av_log(avctx, AV_LOG_ERROR, "Failed to initialize decoder: %s\n",
                 error);
          return AVERROR(EINVAL);
      }
  
      return 0;
  }
  
  // returns 0 on success, AVERROR_INVALIDDATA otherwise
  static int set_pix_fmt(AVCodecContext *avctx, struct vpx_image *img,
                         int has_alpha_channel)
  {
  #if VPX_IMAGE_ABI_VERSION >= 3
      static const enum AVColorSpace colorspaces[8] = {
          AVCOL_SPC_UNSPECIFIED, AVCOL_SPC_BT470BG, AVCOL_SPC_BT709, AVCOL_SPC_SMPTE170M,
          AVCOL_SPC_SMPTE240M, AVCOL_SPC_BT2020_NCL, AVCOL_SPC_RESERVED, AVCOL_SPC_RGB,
      };
  #if VPX_IMAGE_ABI_VERSION >= 4
      static const enum AVColorRange color_ranges[] = {
          AVCOL_RANGE_MPEG, AVCOL_RANGE_JPEG
      };
      avctx->color_range = color_ranges[img->range];
  #endif
      avctx->colorspace = colorspaces[img->cs];
  #endif
      if (avctx->codec_id == AV_CODEC_ID_VP8 && img->fmt != VPX_IMG_FMT_I420)
          return AVERROR_INVALIDDATA;
      switch (img->fmt) {
      case VPX_IMG_FMT_I420:
          if (avctx->codec_id == AV_CODEC_ID_VP9)
              avctx->profile = FF_PROFILE_VP9_0;
          avctx->pix_fmt =
              has_alpha_channel ? AV_PIX_FMT_YUVA420P : AV_PIX_FMT_YUV420P;
          return 0;
  #if CONFIG_LIBVPX_VP9_DECODER
      case VPX_IMG_FMT_I422:
          avctx->profile = FF_PROFILE_VP9_1;
          avctx->pix_fmt = AV_PIX_FMT_YUV422P;
          return 0;
  #if VPX_IMAGE_ABI_VERSION >= 3
      case VPX_IMG_FMT_I440:
          avctx->profile = FF_PROFILE_VP9_1;
          avctx->pix_fmt = AV_PIX_FMT_YUV440P;
          return 0;
  #endif
      case VPX_IMG_FMT_I444:
          avctx->profile = FF_PROFILE_VP9_1;
  #if VPX_IMAGE_ABI_VERSION >= 3
          avctx->pix_fmt = avctx->colorspace == AVCOL_SPC_RGB ?
                           AV_PIX_FMT_GBRP : AV_PIX_FMT_YUV444P;
  #else
          avctx->pix_fmt = AV_PIX_FMT_YUV444P;
  #endif
          return 0;
  #ifdef VPX_IMG_FMT_HIGHBITDEPTH
      case VPX_IMG_FMT_I42016:
          avctx->profile = FF_PROFILE_VP9_2;
          if (img->bit_depth == 10) {
              avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
              return 0;
          } else if (img->bit_depth == 12) {
              avctx->pix_fmt = AV_PIX_FMT_YUV420P12;
              return 0;
          } else {
              return AVERROR_INVALIDDATA;
          }
      case VPX_IMG_FMT_I42216:
          avctx->profile = FF_PROFILE_VP9_3;
          if (img->bit_depth == 10) {
              avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
              return 0;
          } else if (img->bit_depth == 12) {
              avctx->pix_fmt = AV_PIX_FMT_YUV422P12;
              return 0;
          } else {
              return AVERROR_INVALIDDATA;
          }
  #if VPX_IMAGE_ABI_VERSION >= 3
      case VPX_IMG_FMT_I44016:
          avctx->profile = FF_PROFILE_VP9_3;
          if (img->bit_depth == 10) {
              avctx->pix_fmt = AV_PIX_FMT_YUV440P10;
              return 0;
          } else if (img->bit_depth == 12) {
              avctx->pix_fmt = AV_PIX_FMT_YUV440P12;
              return 0;
          } else {
              return AVERROR_INVALIDDATA;
          }
  #endif
      case VPX_IMG_FMT_I44416:
          avctx->profile = FF_PROFILE_VP9_3;
          if (img->bit_depth == 10) {
  #if VPX_IMAGE_ABI_VERSION >= 3
              avctx->pix_fmt = avctx->colorspace == AVCOL_SPC_RGB ?
                               AV_PIX_FMT_GBRP10 : AV_PIX_FMT_YUV444P10;
  #else
              avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
  #endif
              return 0;
          } else if (img->bit_depth == 12) {
  #if VPX_IMAGE_ABI_VERSION >= 3
              avctx->pix_fmt = avctx->colorspace == AVCOL_SPC_RGB ?
                               AV_PIX_FMT_GBRP12 : AV_PIX_FMT_YUV444P12;
  #else
              avctx->pix_fmt = AV_PIX_FMT_YUV444P12;
  #endif
              return 0;
          } else {
              return AVERROR_INVALIDDATA;
          }
  #endif
  #endif
      default:
          return AVERROR_INVALIDDATA;
      }
  }
  
  static int decode_frame(AVCodecContext *avctx, vpx_codec_ctx_t *decoder,
                          uint8_t *data, uint32_t data_sz)
  {
      if (vpx_codec_decode(decoder, data, data_sz, NULL, 0) != VPX_CODEC_OK) {
          const char *error  = vpx_codec_error(decoder);
          const char *detail = vpx_codec_error_detail(decoder);
  
          av_log(avctx, AV_LOG_ERROR, "Failed to decode frame: %s\n", error);
          if (detail) {
              av_log(avctx, AV_LOG_ERROR, "  Additional information: %s\n",
                     detail);
          }
          return AVERROR_INVALIDDATA;
      }
      return 0;
  }
  
  static int vpx_decode(AVCodecContext *avctx,
                        void *data, int *got_frame, AVPacket *avpkt)
  {
      VPxContext *ctx = avctx->priv_data;
      AVFrame *picture = data;
      const void *iter = NULL;
      const void *iter_alpha = NULL;
      struct vpx_image *img, *img_alpha;
      int ret;
      uint8_t *side_data = NULL;
      int side_data_size = 0;
  
      ret = decode_frame(avctx, &ctx->decoder, avpkt->data, avpkt->size);
      if (ret)
          return ret;
  
      side_data = av_packet_get_side_data(avpkt,
                                          AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
                                          &side_data_size);
      if (side_data_size > 1) {
          const uint64_t additional_id = AV_RB64(side_data);
          side_data += 8;
          side_data_size -= 8;
          if (additional_id == 1) {  // 1 stands for alpha channel data.
              if (!ctx->has_alpha_channel) {
                  ctx->has_alpha_channel = 1;
                  ret = vpx_init(avctx,
  #if CONFIG_LIBVPX_VP8_DECODER_VE && CONFIG_LIBVPX_VP9_DECODER
                                 (avctx->codec_id == AV_CODEC_ID_VP8) ?
                                 &vpx_codec_vp8_dx_algo : &vpx_codec_vp9_dx_algo,
  #elif CONFIG_LIBVPX_VP8_DECODER_VE
                                 &vpx_codec_vp8_dx_algo,
  #else
                                 &vpx_codec_vp9_dx_algo,
  #endif
                                 1);
                  if (ret)
                      return ret;
              }
              ret = decode_frame(avctx, &ctx->decoder_alpha, side_data,
                                 side_data_size);
              if (ret)
                  return ret;
          }
      }
  
      if ((img = vpx_codec_get_frame(&ctx->decoder, &iter)) &&
          (!ctx->has_alpha_channel ||
           (img_alpha = vpx_codec_get_frame(&ctx->decoder_alpha, &iter_alpha)))) {
          uint8_t *planes[4];
          int linesizes[4];
  
          if (img->d_w > img->w || img->d_h > img->h) {
              av_log(avctx, AV_LOG_ERROR, "Display dimensions %dx%d exceed storage %dx%d\n",
                     img->d_w, img->d_h, img->w, img->h);
              return AVERROR_EXTERNAL;
          }
  
          if ((ret = set_pix_fmt(avctx, img, ctx->has_alpha_channel)) < 0) {
  #ifdef VPX_IMG_FMT_HIGHBITDEPTH
              av_log(avctx, AV_LOG_ERROR, "Unsupported output colorspace (%d) / bit_depth (%d)\n",
                     img->fmt, img->bit_depth);
  #else
              av_log(avctx, AV_LOG_ERROR, "Unsupported output colorspace (%d) / bit_depth (%d)\n",
                     img->fmt, 8);
  #endif
              return ret;
          }
  
          if ((int) img->d_w != avctx->width || (int) img->d_h != avctx->height) {
              av_log(avctx, AV_LOG_INFO, "dimension change! %dx%d -> %dx%d\n",
                     avctx->width, avctx->height, img->d_w, img->d_h);
              ret = ff_set_dimensions(avctx, img->d_w, img->d_h);
              if (ret < 0)
                  return ret;
          }
          if ((ret = ff_get_buffer(avctx, picture, 0)) < 0)
              return ret;
  
          planes[0] = img->planes[VPX_PLANE_Y];
          planes[1] = img->planes[VPX_PLANE_U];
          planes[2] = img->planes[VPX_PLANE_V];
          planes[3] =
              ctx->has_alpha_channel ? img_alpha->planes[VPX_PLANE_Y] : NULL;
          linesizes[0] = img->stride[VPX_PLANE_Y];
          linesizes[1] = img->stride[VPX_PLANE_U];
          linesizes[2] = img->stride[VPX_PLANE_V];
          linesizes[3] =
              ctx->has_alpha_channel ? img_alpha->stride[VPX_PLANE_Y] : 0;
          av_image_copy(picture->data, picture->linesize, (const uint8_t**)planes,
                        linesizes, avctx->pix_fmt, img->d_w, img->d_h);
          *got_frame           = 1;
      }
      return avpkt->size;
  }
  
  static av_cold int vpx_free(AVCodecContext *avctx)
  {
      VPxContext *ctx = avctx->priv_data;
      vpx_codec_destroy(&ctx->decoder);
      if (ctx->has_alpha_channel)
          vpx_codec_destroy(&ctx->decoder_alpha);
      return 0;
  }
  
  #if CONFIG_LIBVPX_VP8_DECODER_VE
  static av_cold int vp8_init(AVCodecContext *avctx)
  {
      return vpx_init(avctx, &vpx_codec_vp8_dx_algo, 0);
  }
  
  AVCodec ff_libvpx_vp8_decoder = {
      .name           = "libvpx",
      .long_name      = NULL_IF_CONFIG_SMALL("libvpx VP8"),
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = AV_CODEC_ID_VP8,
      .priv_data_size = sizeof(VPxContext),
      .init           = vp8_init,
      .close          = vpx_free,
      .decode         = vpx_decode,
      .capabilities   = AV_CODEC_CAP_AUTO_THREADS | AV_CODEC_CAP_DR1,
  };
  #endif /* CONFIG_LIBVPX_VP8_DECODER_VE */
  
  #if CONFIG_LIBVPX_VP9_DECODER
  static av_cold int vp9_init(AVCodecContext *avctx)
  {
      return vpx_init(avctx, &vpx_codec_vp9_dx_algo, 0);
  }
  
  AVCodec ff_libvpx_vp9_decoder = {
      .name           = "libvpx-vp9",
      .long_name      = NULL_IF_CONFIG_SMALL("libvpx VP9"),
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = AV_CODEC_ID_VP9,
      .priv_data_size = sizeof(VPxContext),
      .init           = vp9_init,
      .close          = vpx_free,
      .decode         = vpx_decode,
      .capabilities   = AV_CODEC_CAP_AUTO_THREADS | AV_CODEC_CAP_DR1,
      .init_static_data = ff_vp9_init_static,
      .profiles       = NULL_IF_CONFIG_SMALL(ff_vp9_profiles),
  };
  #endif /* CONFIG_LIBVPX_VP9_DECODER */
  