blob: 1ca30c2a653db4dce3e4d11b9444dc4ff98643c3
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 | #include "libavutil/cpu.h" |
34 | |
35 | |
36 | typedef void (conv_func_type)(uint8_t *po, const uint8_t *pi, int is, int os, uint8_t *end); |
37 | typedef void (simd_func_type)(uint8_t **dst, const uint8_t **src, int len); |
38 | |
39 | typedef struct AudioConvert { |
40 | int channels; |
41 | int in_simd_align_mask; |
42 | int out_simd_align_mask; |
43 | conv_func_type *conv_f; |
44 | simd_func_type *simd_f; |
45 | const int *ch_map; |
46 | uint8_t silence[8]; ///< silence input sample |
47 | }AudioConvert; |
48 | |
49 | /** |
50 | * Create an audio sample format converter context |
51 | * @param out_fmt Output sample format |
52 | * @param in_fmt Input sample format |
53 | * @param channels Number of channels |
54 | * @param flags See AV_CPU_FLAG_xx |
55 | * @param ch_map list of the channels id to pick from the source stream, NULL |
56 | * if all channels must be selected |
57 | * @return NULL on error |
58 | */ |
59 | AudioConvert *swri_audio_convert_alloc(enum AVSampleFormat out_fmt, |
60 | enum AVSampleFormat in_fmt, |
61 | int channels, const int *ch_map, |
62 | int flags); |
63 | |
64 | /** |
65 | * Free audio sample format converter context. |
66 | * and set the pointer to NULL |
67 | */ |
68 | void swri_audio_convert_free(AudioConvert **ctx); |
69 | |
70 | /** |
71 | * Convert between audio sample formats |
72 | * @param[in] out array of output buffers for each channel. set to NULL to ignore processing of the given channel. |
73 | * @param[in] in array of input buffers for each channel |
74 | * @param len length of audio frame size (measured in samples) |
75 | */ |
76 | int swri_audio_convert(AudioConvert *ctx, AudioData *out, AudioData *in, int len); |
77 | |
78 | #endif /* SWRESAMPLE_AUDIOCONVERT_H */ |
79 |