ffmpeg.libswresample.audioconvert source code

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 module ffmpeg.libswresample.audioconvert;
24 
25 
26 import std.stdint;
27 
28 import ffmpeg.libavutil.avutil;
29 import ffmpeg.libavutil.samplefmt;
30 import ffmpeg.libswresample.swresample_version;
31 import ffmpeg.libswresample.swresample_internal;
32 
33 
34 @nogc nothrow extern(C):
35 
36 alias conv_func_type = void function (ubyte* po, const(ubyte)* pi, int is_, int os, ubyte* end);
37 alias simd_func_type = void function (ubyte** dst, const(ubyte*)* src, int len);
38 
39 struct AudioConvert {
40     int channels;
41     int in_simd_align_mask;
42     int out_simd_align_mask;
43     void function () conv_f;
44     void function () simd_f;
45     const(int)* ch_map;
46     ubyte[8] silence; ///< silence input sample
47 }
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(AVSampleFormat out_fmt,
60                                        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_a_b, AudioData *in_a_b, int len);