/*
  * 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 decoder support via libvpx
  */
 
 #define VPX_CODEC_DISABLE_COMPAT 1

 #include <vpx/vpx_decoder.h>
 #include <vpx/vp8dx.h>

 #include "libavutil/imgutils.h"

 #include "avcodec.h"
 
 typedef struct VP8DecoderContext {
     struct vpx_codec_ctx decoder;
 } VP8Context;
 
 static av_cold int vp8_init(AVCodecContext *avctx)
 {
     VP8Context *ctx = avctx->priv_data;
     const struct vpx_codec_iface *iface = &vpx_codec_vp8_dx_algo;
     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(&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);
     }
 
     avctx->pix_fmt = PIX_FMT_YUV420P;
     return 0;
 }
 
 static int vp8_decode(AVCodecContext *avctx,
                       void *data, int *data_size, AVPacket *avpkt)
 {
     VP8Context *ctx = avctx->priv_data;
     AVFrame *picture = data;
     const void *iter = NULL;
     struct vpx_image *img;
 
     if (vpx_codec_decode(&ctx->decoder, avpkt->data, avpkt->size, NULL, 0) !=
         VPX_CODEC_OK) {
         const char *error  = vpx_codec_error(&ctx->decoder);
         const char *detail = vpx_codec_error_detail(&ctx->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;
     }
 
     if ((img = vpx_codec_get_frame(&ctx->decoder, &iter))) {
         if (img->fmt != VPX_IMG_FMT_I420) {
             av_log(avctx, AV_LOG_ERROR, "Unsupported output colorspace (%d)\n",
                    img->fmt);
             return AVERROR_INVALIDDATA;
         }
 
         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);

             if (av_image_check_size(img->d_w, img->d_h, 0, avctx))

                 return AVERROR_INVALIDDATA;
             avcodec_set_dimensions(avctx, img->d_w, img->d_h);
         }
         picture->data[0]     = img->planes[0];
         picture->data[1]     = img->planes[1];
         picture->data[2]     = img->planes[2];
         picture->data[3]     = NULL;
         picture->linesize[0] = img->stride[0];
         picture->linesize[1] = img->stride[1];
         picture->linesize[2] = img->stride[2];
         picture->linesize[3] = 0;
         *data_size           = sizeof(AVPicture);
     }
     return avpkt->size;
 }
 
 static av_cold int vp8_free(AVCodecContext *avctx)
 {
     VP8Context *ctx = avctx->priv_data;
     vpx_codec_destroy(&ctx->decoder);
     return 0;
 }
 

 AVCodec ff_libvpx_decoder = {

     .name           = "libvpx",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_VP8,
     .priv_data_size = sizeof(VP8Context),
     .init           = vp8_init,
     .close          = vp8_free,
     .decode         = vp8_decode,

     .capabilities   = CODEC_CAP_AUTO_THREADS,
     .long_name      = NULL_IF_CONFIG_SMALL("libvpx VP8"),

 };