repositories / deb_ffmpeg.git / blame
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| 2ba45a60 DM |
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_aarch64(AudioConvert *ac); | |
| 100 | void ff_audio_convert_init_arm(AudioConvert *ac); | |
| 101 | void ff_audio_convert_init_x86(AudioConvert *ac); | |
| 102 | ||
| 103 | #endif /* AVRESAMPLE_AUDIO_CONVERT_H */ |