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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. struct ResampleContext {
  29.     AVAudioResampleContext *avr;
  30.     AudioData *buffer;
  31.     uint8_t *filter_bank;
  32.     int filter_length;
  33.     int ideal_dst_incr;
  34.     int dst_incr;
  35.     unsigned int index;
  36.     int frac;
  37.     int src_incr;
  38.     int compensation_distance;
  39.     int phase_shift;
  40.     int phase_mask;
  41.     int linear;
  42.     enum AVResampleFilterType filter_type;
  43.     int kaiser_beta;
  44.     void (*set_filter)(void *filter, double *tab, int phase, int tap_count);
  45.     void (*resample_one)(struct ResampleContext *c, void *dst0,
  46.                          int dst_index, const void *src0,
  47.                          unsigned int index, int frac);
  48.     void (*resample_nearest)(void *dst0, int dst_index,
  49.                              const void *src0, unsigned int index);
  50.     int padding_size;
  51.     int initial_padding_filled;
  52.     int initial_padding_samples;
  53.     int final_padding_filled;
  54.     int final_padding_samples;
  55. };
  56.  
  57. /**
  58.  * Allocate and initialize a ResampleContext.
  59.  *
  60.  * The parameters in the AVAudioResampleContext are used to initialize the
  61.  * ResampleContext.
  62.  *
  63.  * @param avr  AVAudioResampleContext
  64.  * @return     newly-allocated ResampleContext
  65.  */
  66. ResampleContext *ff_audio_resample_init(AVAudioResampleContext *avr);
  67.  
  68. /**
  69.  * Free a ResampleContext.
  70.  *
  71.  * @param c  ResampleContext
  72.  */
  73. void ff_audio_resample_free(ResampleContext **c);
  74.  
  75. /**
  76.  * Resample audio data.
  77.  *
  78.  * Changes the sample rate.
  79.  *
  80.  * @par
  81.  * All samples in the source data may not be consumed depending on the
  82.  * resampling parameters and the size of the output buffer. The unconsumed
  83.  * samples are automatically added to the start of the source in the next call.
  84.  * If the destination data can be reallocated, that may be done in this function
  85.  * in order to fit all available output. If it cannot be reallocated, fewer
  86.  * input samples will be consumed in order to have the output fit in the
  87.  * destination data buffers.
  88.  *
  89.  * @param c         ResampleContext
  90.  * @param dst       destination audio data
  91.  * @param src       source audio data
  92.  * @return          0 on success, negative AVERROR code on failure
  93.  */
  94. int ff_audio_resample(ResampleContext *c, AudioData *dst, AudioData *src);
  95.  
  96. #endif /* AVRESAMPLE_RESAMPLE_H */
  97.