| /* | |
| * 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 | |
| */ | |
| /** | |
| * @file | |
| * Audio format conversion routines | |
| */ | |
| 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); | |