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  1. /*
  2.  * Audio Frame Queue
  3.  * Copyright (c) 2012 Justin Ruggles
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #ifndef AVCODEC_AUDIO_FRAME_QUEUE_H
  23. #define AVCODEC_AUDIO_FRAME_QUEUE_H
  24.  
  25. #include "avcodec.h"
  26.  
  27. typedef struct AudioFrame {
  28.     int64_t pts;
  29.     int duration;
  30. } AudioFrame;
  31.  
  32. typedef struct AudioFrameQueue {
  33.     AVCodecContext *avctx;
  34.     int remaining_delay;
  35.     int remaining_samples;
  36.     AudioFrame *frames;
  37.     unsigned frame_count;
  38.     unsigned frame_alloc;
  39. } AudioFrameQueue;
  40.  
  41. /**
  42.  * Initialize AudioFrameQueue.
  43.  *
  44.  * @param avctx context to use for time_base and av_log
  45.  * @param afq   queue context
  46.  */
  47. void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq);
  48.  
  49. /**
  50.  * Close AudioFrameQueue.
  51.  *
  52.  * Frees memory if needed.
  53.  *
  54.  * @param afq queue context
  55.  */
  56. void ff_af_queue_close(AudioFrameQueue *afq);
  57.  
  58. /**
  59.  * Add a frame to the queue.
  60.  *
  61.  * @param afq queue context
  62.  * @param f   frame to add to the queue
  63.  */
  64. int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f);
  65.  
  66. /**
  67.  * Remove frame(s) from the queue.
  68.  *
  69.  * Retrieves the pts of the next available frame, or a generated pts based on
  70.  * the last frame duration if there are no frames left in the queue. The number
  71.  * of requested samples should be the full number of samples represented by the
  72.  * packet that will be output by the encoder. If fewer samples are available
  73.  * in the queue, a smaller value will be used for the output duration.
  74.  *
  75.  * @param afq           queue context
  76.  * @param nb_samples    number of samples to remove from the queue
  77.  * @param[out] pts      output packet pts
  78.  * @param[out] duration output packet duration
  79.  */
  80. void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts,
  81.                         int *duration);
  82.  
  83. #endif /* AVCODEC_AUDIO_FRAME_QUEUE_H */
  84.