/* * audio conversion * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> * Copyright (c) 2008 Peter Ross * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef SWRESAMPLE_AUDIOCONVERT_H #define SWRESAMPLE_AUDIOCONVERT_H /** * @file * Audio format conversion routines */ #include "swresample_internal.h" #include "libavutil/cpu.h" typedef void (conv_func_type)(uint8_t *po, const uint8_t *pi, int is, int os, uint8_t *end); typedef void (simd_func_type)(uint8_t **dst, const uint8_t **src, int len); typedef struct AudioConvert { int channels; int in_simd_align_mask; int out_simd_align_mask; conv_func_type *conv_f; simd_func_type *simd_f; const int *ch_map; uint8_t silence[8]; ///< silence input sample }AudioConvert; /** * Create an audio sample format converter context * @param out_fmt Output sample format * @param in_fmt Input sample format * @param channels Number of channels * @param flags See AV_CPU_FLAG_xx * @param ch_map list of the channels id to pick from the source stream, NULL * if all channels must be selected * @return NULL on error */ AudioConvert *swri_audio_convert_alloc(enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, const int *ch_map, int flags); /** * Free audio sample format converter context. * and set the pointer to NULL */ void swri_audio_convert_free(AudioConvert **ctx); /** * Convert between audio sample formats * @param[in] out array of output buffers for each channel. set to NULL to ignore processing of the given channel. * @param[in] in array of input buffers for each channel * @param len length of audio frame size (measured in samples) */ int swri_audio_convert(AudioConvert *ctx, AudioData *out, AudioData *in, int len); #endif /* SWRESAMPLE_AUDIOCONVERT_H */