1 /******************************************************************************
2  *
3  *  Copyright 2022 Google LLC
4  *
5  *  Licensed under the Apache License, Version 2.0 (the "License");
6  *  you may not use this file except in compliance with the License.
7  *  You may obtain a copy of the License at:
8  *
9  *  http://www.apache.org/licenses/LICENSE-2.0
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  ******************************************************************************/
18 
19 #ifndef __LC3BIN_H
20 #define __LC3BIN_H
21 
22 #include <stdio.h>
23 #include <stdint.h>
24 #include <lc3.h>
25 
26 
27 /**
28  * Read LC3 binary header
29  * fp              Opened file, moved after header on return
30  * frame_us        Return frame duration, in us
31  * srate_hz        Return samplerate, in Hz
32  * hrmode          Return true when high-resolution mode enabled
33  * nchannels       Return number of channels
34  * nsamples        Return count of source samples by channels
35  * return          0: Ok  -1: Bad LC3 File
36  */
37 int lc3bin_read_header(FILE *fp,
38     int *frame_us, int *srate_hz, bool *hrmode,
39     int *nchannels, int *nsamples);
40 
41 /**
42  * Read LC3 block of data
43  * fp              Opened file
44  * nchannels       Number of channels
45  * buffer          Output buffer of `nchannels * LC3_HR_MAX_FRAME_BYTES`
46  * return          Size of the frames block, -1 on error
47  */
48 int lc3bin_read_data(FILE *fp, int nchannels, void *buffer);
49 
50 /**
51  * Write LC3 binary header
52  * fp              Opened file, moved after header on return
53  * frame_us        Frame duration, in us
54  * srate_hz        Samplerate, in Hz
55  * hrmode          True when high-resolution mode enabled
56  * bitrate         Bitrate indication of the stream, in bps
57  * nchannels       Number of channels
58  * nsamples        Count of source samples by channels
59  */
60 void lc3bin_write_header(FILE *fp,
61     int frame_us, int srate_hz, bool hrmode,
62     int bitrate, int nchannels, int nsamples);
63 
64 /**
65  * Write LC3 block of data
66  * fp              Opened file
67  * data            The frames data
68  * nbytes          Size of the frames block
69  */
70 void lc3bin_write_data(FILE *fp, const void *data, int nbytes);
71 
72 
73 #endif /* __LC3BIN_H */
74