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"
37 * Generate string corresponding to the sample format with
38 * number sample_fmt, or a header if sample_fmt is negative.
40 * @param[in] buf the buffer where to write the string
41 * @param[in] buf_size the size of buf
42 * @param[in] sample_fmt the number of the sample format to print the corresponding info string, or
43 * a negative value to print the corresponding header.
44 * Meaningful values for obtaining a sample format info vary from 0 to SAMPLE_FMT_NB -1.
46 void avcodec_sample_fmt_string(char *buf, int buf_size, int sample_fmt);
49 * @return NULL on error
51 const char *avcodec_get_sample_fmt_name(int sample_fmt);
54 * @return SAMPLE_FMT_NONE on error
56 enum SampleFormat avcodec_get_sample_fmt(const char* name);
59 * @return NULL on error
61 const char *avcodec_get_channel_name(int channel_id);
64 * @return channel layout that matches name, 0 if no match
66 int64_t avcodec_get_channel_layout(const char *name);
69 * Return description of channel layout
71 void avcodec_get_channel_layout_string(char *buf, int buf_size, int nb_channels, int64_t channel_layout);
74 * Guess the channel layout
76 * @param codec_id Codec identifier, or CODEC_ID_NONE if unknown
77 * @param fmt_name Format name, or NULL if unknown
78 * @return Channel layout mask
80 int64_t avcodec_guess_channel_layout(int nb_channels, enum CodecID codec_id, const char *fmt_name);
83 * @return the number of channels in the channel layout.
85 int avcodec_channel_layout_num_channels(int64_t channel_layout);
87 struct AVAudioConvert;
88 typedef struct AVAudioConvert AVAudioConvert;
91 * Create an audio sample format converter context
92 * @param out_fmt Output sample format
93 * @param out_channels Number of output channels
94 * @param in_fmt Input sample format
95 * @param in_channels Number of input channels
96 * @param[in] matrix Channel mixing matrix (of dimension in_channel*out_channels). Set to NULL to ignore.
97 * @param flags See AV_CPU_FLAG_xx
98 * @return NULL on error
100 AVAudioConvert *av_audio_convert_alloc(enum SampleFormat out_fmt, int out_channels,
101 enum SampleFormat in_fmt, int in_channels,
102 const float *matrix, int flags);
105 * Free audio sample format converter context
107 void av_audio_convert_free(AVAudioConvert *ctx);
110 * Convert between audio sample formats
111 * @param[in] out array of output buffers for each channel. set to NULL to ignore processing of the given channel.
112 * @param[in] out_stride distance between consecutive output samples (measured in bytes)
113 * @param[in] in array of input buffers for each channel
114 * @param[in] in_stride distance between consecutive input samples (measured in bytes)
115 * @param len length of audio frame size (measured in samples)
117 int av_audio_convert(AVAudioConvert *ctx,
118 void * const out[6], const int out_stride[6],
119 const void * const in[6], const int in_stride[6], int len);
121 #endif /* AVCODEC_AUDIOCONVERT_H */