3 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * Copyright (c) 2008 Peter Ross
6 * This file is part of FFmpeg.
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.
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.
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
23 #ifndef AVCODEC_AUDIOCONVERT_H
24 #define AVCODEC_AUDIOCONVERT_H
28 * Audio format conversion routines
32 #include "libavutil/cpu.h"
34 #include "libavutil/audioconvert.h"
37 * Guess the channel layout
39 * @param codec_id Codec identifier, or CODEC_ID_NONE if unknown
40 * @param fmt_name Format name, or NULL if unknown
41 * @return Channel layout mask
43 uint64_t avcodec_guess_channel_layout(int nb_channels, enum CodecID codec_id, const char *fmt_name);
45 struct AVAudioConvert;
46 typedef struct AVAudioConvert AVAudioConvert;
49 * Create an audio sample format converter context
50 * @param out_fmt Output sample format
51 * @param out_channels Number of output channels
52 * @param in_fmt Input sample format
53 * @param in_channels Number of input channels
54 * @param[in] matrix Channel mixing matrix (of dimension in_channel*out_channels). Set to NULL to ignore.
55 * @param flags See AV_CPU_FLAG_xx
56 * @return NULL on error
58 AVAudioConvert *av_audio_convert_alloc(enum AVSampleFormat out_fmt, int out_channels,
59 enum AVSampleFormat in_fmt, int in_channels,
60 const float *matrix, int flags);
63 * Free audio sample format converter context
65 void av_audio_convert_free(AVAudioConvert *ctx);
68 * Convert between audio sample formats
69 * @param[in] out array of output buffers for each channel. set to NULL to ignore processing of the given channel.
70 * @param[in] out_stride distance between consecutive output samples (measured in bytes)
71 * @param[in] in array of input buffers for each channel
72 * @param[in] in_stride distance between consecutive input samples (measured in bytes)
73 * @param len length of audio frame size (measured in samples)
75 int av_audio_convert(AVAudioConvert *ctx,
76 void * const out[6], const int out_stride[6],
77 const void * const in[6], const int in_stride[6], int len);
79 #endif /* AVCODEC_AUDIOCONVERT_H */