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  1. /*
  2.  * audio conversion
  3.  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  4.  * Copyright (c) 2008 Peter Ross
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #ifndef SWR_AUDIOCONVERT_H
  24. #define SWR_AUDIOCONVERT_H
  25.  
  26. /**
  27.  * @file
  28.  * Audio format conversion routines
  29.  */
  30.  
  31.  
  32. #include "swresample_internal.h"
  33. #include "libavutil/cpu.h"
  34.  
  35.  
  36. typedef void (conv_func_type)(uint8_t *po, const uint8_t *pi, int is, int os, uint8_t *end);
  37. typedef void (simd_func_type)(uint8_t **dst, const uint8_t **src, int len);
  38.  
  39. typedef struct AudioConvert {
  40.     int channels;
  41.     int  in_simd_align_mask;
  42.     int out_simd_align_mask;
  43.     conv_func_type *conv_f;
  44.     simd_func_type *simd_f;
  45.     const int *ch_map;
  46.     uint8_t silence[8]; ///< silence input sample
  47. }AudioConvert;
  48.  
  49. /**
  50.  * Create an audio sample format converter context
  51.  * @param out_fmt Output sample format
  52.  * @param in_fmt Input sample format
  53.  * @param channels Number of channels
  54.  * @param flags See AV_CPU_FLAG_xx
  55.  * @param ch_map list of the channels id to pick from the source stream, NULL
  56.  *               if all channels must be selected
  57.  * @return NULL on error
  58.  */
  59. AudioConvert *swri_audio_convert_alloc(enum AVSampleFormat out_fmt,
  60.                                        enum AVSampleFormat in_fmt,
  61.                                        int channels, const int *ch_map,
  62.                                        int flags);
  63.  
  64. /**
  65.  * Free audio sample format converter context.
  66.  * and set the pointer to NULL
  67.  */
  68. void swri_audio_convert_free(AudioConvert **ctx);
  69.  
  70. /**
  71.  * Convert between audio sample formats
  72.  * @param[in] out array of output buffers for each channel. set to NULL to ignore processing of the given channel.
  73.  * @param[in] in array of input buffers for each channel
  74.  * @param len length of audio frame size (measured in samples)
  75.  */
  76. int swri_audio_convert(AudioConvert *ctx, AudioData *out, AudioData *in, int len);
  77.  
  78. #endif /* AUDIOCONVERT_H */
  79.