text: /*
   * generic decoding-related code
   *
   * 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
   */
  
  #ifndef AVCODEC_DECODE_H
  #define AVCODEC_DECODE_H
  
  #include "libavutil/buffer.h"
  #include "libavutil/frame.h"
  #include "libavutil/hwcontext.h"
  
  #include "avcodec.h"
  
  /**
   * This struct stores per-frame lavc-internal data and is attached to it via
   * private_ref.
   */
  typedef struct FrameDecodeData {
      /**
       * The callback to perform some delayed processing on the frame right
       * before it is returned to the caller.
       *
       * @note This code is called at some unspecified point after the frame is
       * returned from the decoder's decode/receive_frame call. Therefore it cannot rely
       * on AVCodecContext being in any specific state, so it does not get to
       * access AVCodecContext directly at all. All the state it needs must be
       * stored in the post_process_opaque object.
       */
      int (*post_process)(void *logctx, AVFrame *frame);
      void *post_process_opaque;
      void (*post_process_opaque_free)(void *opaque);
  
      /**
       * Per-frame private data for hwaccels.
       */
      void *hwaccel_priv;
      void (*hwaccel_priv_free)(void *priv);
  } FrameDecodeData;
  
  /**
   * Called by decoders to get the next packet for decoding.
   *
   * @param pkt An empty packet to be filled with data.
   * @return 0 if a new reference has been successfully written to pkt
   *         AVERROR(EAGAIN) if no data is currently available
   *         AVERROR_EOF if and end of stream has been reached, so no more data
   *                     will be available
   */
  int ff_decode_get_packet(AVCodecContext *avctx, AVPacket *pkt);
  
  int ff_decode_bsfs_init(AVCodecContext *avctx);
  
  void ff_decode_bsfs_uninit(AVCodecContext *avctx);
  
  /**
   * Make sure avctx.hw_frames_ctx is set. If it's not set, the function will
   * try to allocate it from hw_device_ctx. If that is not possible, an error
   * message is printed, and an error code is returned.
   */
  int ff_decode_get_hw_frames_ctx(AVCodecContext *avctx,
                                  enum AVHWDeviceType dev_type);
  
  int ff_attach_decode_data(AVFrame *frame);
  
  #endif /* AVCODEC_DECODE_H */
  