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  1. /*
  2.  * Copyright (c) Stefano Sabatini | stefasab at gmail.com
  3.  * Copyright (c) S.N. Hemanth Meenakshisundaram | smeenaks at ucsd.edu
  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 AVFILTER_AUDIO_H
  23. #define AVFILTER_AUDIO_H
  24.  
  25. #include "avfilter.h"
  26. #include "internal.h"
  27.  
  28. static const enum AVSampleFormat ff_packed_sample_fmts_array[] = {
  29.     AV_SAMPLE_FMT_U8,
  30.     AV_SAMPLE_FMT_S16,
  31.     AV_SAMPLE_FMT_S32,
  32.     AV_SAMPLE_FMT_FLT,
  33.     AV_SAMPLE_FMT_DBL,
  34.     AV_SAMPLE_FMT_NONE
  35. };
  36.  
  37. static const enum AVSampleFormat ff_planar_sample_fmts_array[] = {
  38.     AV_SAMPLE_FMT_U8P,
  39.     AV_SAMPLE_FMT_S16P,
  40.     AV_SAMPLE_FMT_S32P,
  41.     AV_SAMPLE_FMT_FLTP,
  42.     AV_SAMPLE_FMT_DBLP,
  43.     AV_SAMPLE_FMT_NONE
  44. };
  45.  
  46. /** default handler for get_audio_buffer() for audio inputs */
  47. AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples);
  48.  
  49. /** get_audio_buffer() handler for filters which simply pass audio along */
  50. AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples);
  51.  
  52. /**
  53.  * Request an audio samples buffer with a specific set of permissions.
  54.  *
  55.  * @param link           the output link to the filter from which the buffer will
  56.  *                       be requested
  57.  * @param nb_samples     the number of samples per channel
  58.  * @return               A reference to the samples. This must be unreferenced with
  59.  *                       avfilter_unref_buffer when you are finished with it.
  60.  */
  61. AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples);
  62.  
  63. /**
  64.  * Send a buffer of audio samples to the next filter.
  65.  *
  66.  * @param link       the output link over which the audio samples are being sent
  67.  * @param samplesref a reference to the buffer of audio samples being sent. The
  68.  *                   receiving filter will free this reference when it no longer
  69.  *                   needs it or pass it on to the next filter.
  70.  *
  71.  * @return >= 0 on success, a negative AVERROR on error. The receiving filter
  72.  * is responsible for unreferencing samplesref in case of error.
  73.  */
  74. int ff_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
  75.  
  76. /**
  77.  * Send a buffer of audio samples to the next link, without checking
  78.  * min_samples.
  79.  */
  80. int ff_filter_samples_framed(AVFilterLink *link,
  81.                              AVFilterBufferRef *samplesref);
  82.  
  83. #endif /* AVFILTER_AUDIO_H */
  84.