text: /*
   * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
   *
   * This file is part of Libav.
   *
   * Libav 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.
   *
   * Libav 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 Libav; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  /**
  * @file
  * data structures common to libdirac and libschroedinger
  */
  
  #ifndef AVCODEC_LIBDIRAC_LIBSCHRO_H
  #define AVCODEC_LIBDIRAC_LIBSCHRO_H
  
  #include "avcodec.h"
  
  typedef struct {
      uint16_t width;
      uint16_t height;
      uint16_t frame_rate_num;
      uint16_t frame_rate_denom;
  } DiracSchroVideoFormatInfo;
  
  /**
  * Returns the index into the Dirac Schro common video format info table
  */
  unsigned int ff_dirac_schro_get_video_format_idx(AVCodecContext *avccontext);
  
  /**
  * contains a single encoded frame returned from Dirac or Schroedinger
  */
  typedef struct DiracSchroEncodedFrame {
      /** encoded frame data */
      uint8_t *p_encbuf;
  
      /** encoded frame size */
      uint32_t size;
  
      /** encoded frame number. Will be used as pts */
      uint32_t frame_num;
  
      /** key frame flag. 1 : is key frame , 0 : in not key frame */
      uint16_t key_frame;
  } DiracSchroEncodedFrame;
  
  /**
  * queue element
  */
  typedef struct DiracSchroQueueElement {
      /** Data to be stored in queue*/
      void *data;
      /** Pointer to next element queue */
      struct DiracSchroQueueElement *next;
  } DiracSchroQueueElement;
  
  
  /**
  * A simple queue implementation used in libdirac and libschroedinger
  */
  typedef struct DiracSchroQueue {
      /** Pointer to head of queue */
      DiracSchroQueueElement *p_head;
      /** Pointer to tail of queue */
      DiracSchroQueueElement *p_tail;
      /** Queue size*/
      int size;
  } DiracSchroQueue;
  
  /**
  * Initialise the queue
  */
  void ff_dirac_schro_queue_init(DiracSchroQueue *queue);
  
  /**
  * Add an element to the end of the queue
  */
  int ff_dirac_schro_queue_push_back(DiracSchroQueue *queue, void *p_data);
  
  /**
  * Return the first element in the queue
  */
  void *ff_dirac_schro_queue_pop(DiracSchroQueue *queue);
  
  /**
  * Free the queue resources. free_func is a function supplied by the caller to
  * free any resources allocated by the caller. The data field of the queue
  * element is passed to it.
  */
  void ff_dirac_schro_queue_free(DiracSchroQueue *queue,
                                 void (*free_func)(void *));
  #endif /* AVCODEC_LIBDIRAC_LIBSCHRO_H */
  