text: /*
   * Intel MediaSDK QSV based VC-1 video decoder
   *
   * 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 <stdint.h>
  #include <string.h>
  
  #include "libavutil/common.h"
  #include "libavutil/fifo.h"
  #include "libavutil/opt.h"
  
  #include "avcodec.h"
  #include "qsvdec.h"
  
  typedef struct QSVVC1Context {
      AVClass *class;
      QSVContext qsv;
  } QSVVC1Context;
  
  
  static av_cold int qsv_decode_close(AVCodecContext *avctx)
  {
      QSVVC1Context *s = avctx->priv_data;
  
      ff_qsv_decode_close(&s->qsv);
  
      return 0;
  }
  
  static int qsv_decode_frame(AVCodecContext *avctx, void *data,
                              int *got_frame, AVPacket *avpkt)
  {
      QSVVC1Context *s = avctx->priv_data;
      AVFrame *frame    = data;
  
      return ff_qsv_decode(avctx, &s->qsv, frame, got_frame, avpkt);
  }
  
  AVHWAccel ff_vc1_qsv_hwaccel = {
      .name           = "vc1_qsv",
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = AV_CODEC_ID_VC1,
      .pix_fmt        = AV_PIX_FMT_QSV,
  };
  
  #define OFFSET(x) offsetof(QSVVC1Context, x)
  #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
  static const AVOption options[] = {
      { "async_depth", "Internal parallelization depth, the higher the value the higher the latency.", OFFSET(qsv.async_depth), AV_OPT_TYPE_INT, { .i64 = ASYNC_DEPTH_DEFAULT }, 0, INT_MAX, VD },
      { NULL },
  };
  
  static const AVClass class = {
      .class_name = "vc1_qsv",
      .item_name  = av_default_item_name,
      .option     = options,
      .version    = LIBAVUTIL_VERSION_INT,
  };
  
  AVCodec ff_vc1_qsv_decoder = {
      .name           = "vc1_qsv",
      .long_name      = NULL_IF_CONFIG_SMALL("VC-1 video (Intel Quick Sync Video acceleration)"),
      .priv_data_size = sizeof(QSVVC1Context),
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = AV_CODEC_ID_VC1,
      .init           = NULL,
      .decode         = qsv_decode_frame,
      .flush          = NULL,
      .close          = qsv_decode_close,
      .capabilities   = AV_CODEC_CAP_DELAY,
      .priv_class     = &class,
  };
  