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  1. /*
  2.  * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
  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_AUDIO_CONVERT_H
  22. #define AVRESAMPLE_AUDIO_CONVERT_H
  23.  
  24. #include "libavutil/samplefmt.h"
  25. #include "avresample.h"
  26. #include "internal.h"
  27. #include "audio_data.h"
  28.  
  29. /**
  30.  * Set conversion function if the parameters match.
  31.  *
  32.  * This compares the parameters of the conversion function to the parameters
  33.  * in the AudioConvert context. If the parameters do not match, no changes are
  34.  * made to the active functions. If the parameters do match and the alignment
  35.  * is not constrained, the function is set as the generic conversion function.
  36.  * If the parameters match and the alignment is constrained, the function is
  37.  * set as the optimized conversion function.
  38.  *
  39.  * @param ac             AudioConvert context
  40.  * @param out_fmt        output sample format
  41.  * @param in_fmt         input sample format
  42.  * @param channels       number of channels, or 0 for any number of channels
  43.  * @param ptr_align      buffer pointer alignment, in bytes
  44.  * @param samples_align  buffer size alignment, in samples
  45.  * @param descr          function type description (e.g. "C" or "SSE")
  46.  * @param conv           conversion function pointer
  47.  */
  48. void ff_audio_convert_set_func(AudioConvert *ac, enum AVSampleFormat out_fmt,
  49.                                enum AVSampleFormat in_fmt, int channels,
  50.                                int ptr_align, int samples_align,
  51.                                const char *descr, void *conv);
  52.  
  53. /**
  54.  * Allocate and initialize AudioConvert context for sample format conversion.
  55.  *
  56.  * @param avr         AVAudioResampleContext
  57.  * @param out_fmt     output sample format
  58.  * @param in_fmt      input sample format
  59.  * @param channels    number of channels
  60.  * @param sample_rate sample rate (used for dithering)
  61.  * @param apply_map   apply channel map during conversion
  62.  * @return            newly-allocated AudioConvert context
  63.  */
  64. AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr,
  65.                                      enum AVSampleFormat out_fmt,
  66.                                      enum AVSampleFormat in_fmt,
  67.                                      int channels, int sample_rate,
  68.                                      int apply_map);
  69.  
  70. /**
  71.  * Free AudioConvert.
  72.  *
  73.  * The AudioConvert must have been previously allocated with ff_audio_convert_alloc().
  74.  *
  75.  * @param ac  AudioConvert struct
  76.  */
  77. void ff_audio_convert_free(AudioConvert **ac);
  78.  
  79. /**
  80.  * Convert audio data from one sample format to another.
  81.  *
  82.  * For each call, the alignment of the input and output AudioData buffers are
  83.  * examined to determine whether to use the generic or optimized conversion
  84.  * function (when available).
  85.  *
  86.  * The number of samples to convert is determined by in->nb_samples. The output
  87.  * buffer must be large enough to handle this many samples. out->nb_samples is
  88.  * set by this function before a successful return.
  89.  *
  90.  * @param ac     AudioConvert context
  91.  * @param out    output audio data
  92.  * @param in     input audio data
  93.  * @return       0 on success, negative AVERROR code on failure
  94.  */
  95. int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in);
  96.  
  97. /* arch-specific initialization functions */
  98.  
  99. void ff_audio_convert_init_arm(AudioConvert *ac);
  100. void ff_audio_convert_init_x86(AudioConvert *ac);
  101.  
  102. #endif /* AVRESAMPLE_AUDIO_CONVERT_H */
  103.