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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 */ |