1 /*
2 * Copyright (C) 2022 BlueKitchen GmbH
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the copyright holders nor the names of
14 * contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * 4. Any redistribution, use, or modification is done solely for
17 * personal benefit and not for any commercial purpose or for
18 * monetary gain.
19 *
20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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36 */
37
38 // *****************************************************************************
39 //
40 // LC3 Interface
41 //
42 // *****************************************************************************
43
44 #define BTSTACK_FILE__ "btstack_lc3.c"
45
46 #include "btstack_lc3.h"
47 #include "btstack_debug.h"
48
btstack_lc3_frame_duration_in_us(btstack_lc3_frame_duration_t frame_duration)49 uint16_t btstack_lc3_frame_duration_in_us(btstack_lc3_frame_duration_t frame_duration){
50 switch (frame_duration){
51 case BTSTACK_LC3_FRAME_DURATION_7500US:
52 return 7500;
53 case BTSTACK_LC3_FRAME_DURATION_10000US:
54 return 10000;
55 default:
56 return 0;
57 }
58 }
59
btstack_lc3_samples_per_frame(uint32_t sample_rate,btstack_lc3_frame_duration_t frame_duration)60 uint16_t btstack_lc3_samples_per_frame(uint32_t sample_rate, btstack_lc3_frame_duration_t frame_duration){
61 // 44.1 kHz uses longer iso interval and same number of samples as 48 khz
62 if (sample_rate == 44100){
63 sample_rate = 48000;
64 }
65 // assume sample rate is x 1000 hz
66 return (sample_rate / 1000) * (btstack_lc3_frame_duration_in_us(frame_duration) / 100) / 10;
67 }
68