/*
  * 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/hwcontext.h"

 #include "libavutil/pixdesc.h"

 
 #include "ffmpeg.h"
 
 static void cuvid_uninit(AVCodecContext *avctx)
 {

     InputStream *ist = avctx->opaque;

     av_buffer_unref(&ist->hw_frames_ctx);
 }
 
 int cuvid_init(AVCodecContext *avctx)
 {

     InputStream *ist = avctx->opaque;
     AVHWFramesContext *frames_ctx;
     int ret;

     av_log(avctx, AV_LOG_VERBOSE, "Initializing cuvid hwaccel\n");

     if (!hw_device_ctx) {
         ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_CUDA,
                                      ist->hwaccel_device, NULL, 0);
         if (ret < 0) {
             av_log(avctx, AV_LOG_ERROR, "Error creating a CUDA device\n");
             return ret;

         }
     }
 

     av_buffer_unref(&ist->hw_frames_ctx);
     ist->hw_frames_ctx = av_hwframe_ctx_alloc(hw_device_ctx);
     if (!ist->hw_frames_ctx) {
         av_log(avctx, AV_LOG_ERROR, "Error creating a CUDA frames context\n");
         return AVERROR(ENOMEM);
     }

     frames_ctx = (AVHWFramesContext*)ist->hw_frames_ctx->data;

     frames_ctx->format = AV_PIX_FMT_CUDA;
     frames_ctx->sw_format = avctx->sw_pix_fmt;
     frames_ctx->width = avctx->width;
     frames_ctx->height = avctx->height;

     av_log(avctx, AV_LOG_DEBUG, "Initializing CUDA frames context: sw_format = %s, width = %d, height = %d\n",
            av_get_pix_fmt_name(frames_ctx->sw_format), frames_ctx->width, frames_ctx->height);

     ret = av_hwframe_ctx_init(ist->hw_frames_ctx);
     if (ret < 0) {
         av_log(avctx, AV_LOG_ERROR, "Error initializing a CUDA frame pool\n");
         return ret;

     }
 

     ist->hwaccel_uninit = cuvid_uninit;

 
     return 0;
 }