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| Rev | Author | Line No. | Line |
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| 6148 | serge | 1 | /* |
| 2 | * Copyright (c) 2012 Justin Ruggles |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #ifndef AVRESAMPLE_AUDIO_CONVERT_H |
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| 22 | #define AVRESAMPLE_AUDIO_CONVERT_H |
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| 23 | |||
| 24 | #include "libavutil/samplefmt.h" |
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| 25 | #include "avresample.h" |
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| 26 | #include "internal.h" |
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| 27 | #include "audio_data.h" |
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| 28 | |||
| 29 | /** |
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| 30 | * Set conversion function if the parameters match. |
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| 31 | * |
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| 32 | * This compares the parameters of the conversion function to the parameters |
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| 33 | * in the AudioConvert context. If the parameters do not match, no changes are |
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| 34 | * made to the active functions. If the parameters do match and the alignment |
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| 35 | * is not constrained, the function is set as the generic conversion function. |
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| 36 | * If the parameters match and the alignment is constrained, the function is |
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| 37 | * set as the optimized conversion function. |
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| 38 | * |
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| 39 | * @param ac AudioConvert context |
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| 40 | * @param out_fmt output sample format |
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| 41 | * @param in_fmt input sample format |
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| 42 | * @param channels number of channels, or 0 for any number of channels |
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| 43 | * @param ptr_align buffer pointer alignment, in bytes |
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| 44 | * @param samples_align buffer size alignment, in samples |
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| 45 | * @param descr function type description (e.g. "C" or "SSE") |
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| 46 | * @param conv conversion function pointer |
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| 47 | */ |
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| 48 | void ff_audio_convert_set_func(AudioConvert *ac, enum AVSampleFormat out_fmt, |
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| 49 | enum AVSampleFormat in_fmt, int channels, |
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| 50 | int ptr_align, int samples_align, |
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| 51 | const char *descr, void *conv); |
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| 52 | |||
| 53 | /** |
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| 54 | * Allocate and initialize AudioConvert context for sample format conversion. |
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| 55 | * |
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| 56 | * @param avr AVAudioResampleContext |
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| 57 | * @param out_fmt output sample format |
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| 58 | * @param in_fmt input sample format |
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| 59 | * @param channels number of channels |
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| 60 | * @param sample_rate sample rate (used for dithering) |
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| 61 | * @param apply_map apply channel map during conversion |
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| 62 | * @return newly-allocated AudioConvert context |
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| 63 | */ |
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| 64 | AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, |
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| 65 | enum AVSampleFormat out_fmt, |
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| 66 | enum AVSampleFormat in_fmt, |
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| 67 | int channels, int sample_rate, |
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| 68 | int apply_map); |
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| 69 | |||
| 70 | /** |
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| 71 | * Free AudioConvert. |
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| 72 | * |
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| 73 | * The AudioConvert must have been previously allocated with ff_audio_convert_alloc(). |
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| 74 | * |
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| 75 | * @param ac AudioConvert struct |
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| 76 | */ |
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| 77 | void ff_audio_convert_free(AudioConvert **ac); |
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| 78 | |||
| 79 | /** |
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| 80 | * Convert audio data from one sample format to another. |
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| 81 | * |
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| 82 | * For each call, the alignment of the input and output AudioData buffers are |
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| 83 | * examined to determine whether to use the generic or optimized conversion |
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| 84 | * function (when available). |
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| 85 | * |
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| 86 | * The number of samples to convert is determined by in->nb_samples. The output |
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| 87 | * buffer must be large enough to handle this many samples. out->nb_samples is |
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| 88 | * set by this function before a successful return. |
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| 89 | * |
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| 90 | * @param ac AudioConvert context |
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| 91 | * @param out output audio data |
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| 92 | * @param in input audio data |
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| 93 | * @return 0 on success, negative AVERROR code on failure |
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| 94 | */ |
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| 95 | int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in); |
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| 96 | |||
| 97 | /* arch-specific initialization functions */ |
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| 98 | |||
| 99 | void ff_audio_convert_init_arm(AudioConvert *ac); |
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| 100 | void ff_audio_convert_init_x86(AudioConvert *ac); |
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| 101 | |||
| 102 | #endif /* AVRESAMPLE_AUDIO_CONVERT_H */ |