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  1. /*
  2.  * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #ifndef AVRESAMPLE_RESAMPLE_H
  22. #define AVRESAMPLE_RESAMPLE_H
  23.  
  24. #include "avresample.h"
  25. #include "internal.h"
  26. #include "audio_data.h"
  27.  
  28. /**
  29.  * Allocate and initialize a ResampleContext.
  30.  *
  31.  * The parameters in the AVAudioResampleContext are used to initialize the
  32.  * ResampleContext.
  33.  *
  34.  * @param avr  AVAudioResampleContext
  35.  * @return     newly-allocated ResampleContext
  36.  */
  37. ResampleContext *ff_audio_resample_init(AVAudioResampleContext *avr);
  38.  
  39. /**
  40.  * Free a ResampleContext.
  41.  *
  42.  * @param c  ResampleContext
  43.  */
  44. void ff_audio_resample_free(ResampleContext **c);
  45.  
  46. /**
  47.  * Resample audio data.
  48.  *
  49.  * Changes the sample rate.
  50.  *
  51.  * @par
  52.  * All samples in the source data may not be consumed depending on the
  53.  * resampling parameters and the size of the output buffer. The unconsumed
  54.  * samples are automatically added to the start of the source in the next call.
  55.  * If the destination data can be reallocated, that may be done in this function
  56.  * in order to fit all available output. If it cannot be reallocated, fewer
  57.  * input samples will be consumed in order to have the output fit in the
  58.  * destination data buffers.
  59.  *
  60.  * @param c         ResampleContext
  61.  * @param dst       destination audio data
  62.  * @param src       source audio data
  63.  * @return          0 on success, negative AVERROR code on failure
  64.  */
  65. int ff_audio_resample(ResampleContext *c, AudioData *dst, AudioData *src);
  66.  
  67. #endif /* AVRESAMPLE_RESAMPLE_H */
  68.