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 SWRESAMPLE_AUDIOCONVERT_H 24 #define SWRESAMPLE_AUDIOCONVERT_H 25 26 /** 27 * @file 28 * Audio format conversion routines 29 */ 30 31 32 #include "swresample_internal.h" 33 34 35 typedef void (conv_func_type)(uint8_t *po, const uint8_t *pi, int is, int os, uint8_t *end); 36 typedef void (simd_func_type)(uint8_t **dst, const uint8_t **src, int len); 37 38 typedef struct AudioConvert { 39 int channels; 40 int in_simd_align_mask; 41 int out_simd_align_mask; 42 conv_func_type *conv_f; 43 simd_func_type *simd_f; 44 const int *ch_map; 45 uint8_t silence[8]; ///< silence input sample 46 }AudioConvert; 47 48 /** 49 * Create an audio sample format converter context 50 * @param out_fmt Output sample format 51 * @param in_fmt Input sample format 52 * @param channels Number of channels 53 * @param flags See AV_CPU_FLAG_xx 54 * @param ch_map list of the channels id to pick from the source stream, NULL 55 * if all channels must be selected 56 * @return NULL on error 57 */ 58 AudioConvert *swri_audio_convert_alloc(enum AVSampleFormat out_fmt, 59 enum AVSampleFormat in_fmt, 60 int channels, const int *ch_map, 61 int flags); 62 63 /** 64 * Free audio sample format converter context. 65 * and set the pointer to NULL 66 */ 67 void swri_audio_convert_free(AudioConvert **ctx); 68 69 /** 70 * Convert between audio sample formats 71 * @param[in] out array of output buffers for each channel. set to NULL to ignore processing of the given channel. 72 * @param[in] in array of input buffers for each channel 73 * @param len length of audio frame size (measured in samples) 74 */ 75 int swri_audio_convert(AudioConvert *ctx, AudioData *out, AudioData *in, int len); 76 77 #endif /* SWRESAMPLE_AUDIOCONVERT_H */ 78