1 /* 2 * Copyright (C) 2017 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, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #ifndef BTSTACK_AUDIO_H 39 #define BTSTACK_AUDIO_H 40 41 #include <stdint.h> 42 43 #if defined __cplusplus 44 extern "C" { 45 #endif 46 47 /* 48 * btstack_audio.h 49 * 50 * Abstraction layer for 16-bit audio playback and recording within BTstack 51 */ 52 53 typedef struct { 54 55 /** 56 * @brief Setup audio codec for specified samplerate and number of channels 57 * @param Channels (1=mono, 2=stereo) 58 * @param Sample rate 59 * @param Playback callback 60 * @return 1 on success 61 */ 62 int (*init)(uint8_t channels, 63 uint32_t samplerate, 64 void (*playback) (int16_t * buffer, uint16_t num_samples)); 65 66 /** 67 * @brief Set volume 68 * @param Volume 0..127 69 */ 70 void (*set_volume)(uint8_t volume); 71 72 /** 73 * @brief Start stream 74 */ 75 void (*start_stream)(void); 76 77 /** 78 * @brief Stop stream 79 */ 80 void (*stop_stream)(void); 81 82 /** 83 * @brief Close audio codec 84 */ 85 void (*close)(void); 86 87 } btstack_audio_sink_t; 88 89 90 typedef struct { 91 92 /** 93 * @brief Setup audio codec for specified samplerate and number of channels 94 * @param Channels (1=mono, 2=stereo) 95 * @param Sample rate 96 * @param Recording callback 97 * @return 1 on success 98 */ 99 int (*init)(uint8_t channels, 100 uint32_t samplerate, 101 void (*recording)(const int16_t * buffer, uint16_t num_samples)); 102 103 /** 104 * @brief Set Gain 105 * @param Gain 0..127 106 */ 107 void (*set_gain)(uint8_t gain); 108 109 /** 110 * @brief Start stream 111 */ 112 void (*start_stream)(void); 113 114 /** 115 * @brief Stop stream 116 */ 117 void (*stop_stream)(void); 118 119 /** 120 * @brief Close audio codec 121 */ 122 void (*close)(void); 123 124 } btstack_audio_source_t; 125 126 127 /** 128 * @brief Get BTstack Audio Sink Instance 129 * @returns btstack_audio_sink implementation 130 */ 131 const btstack_audio_sink_t * btstack_audio_sink_get_instance(void); 132 133 /** 134 * @brief Get BTstack Audio Source Instance 135 * @returns btstack_audio_source implementation 136 */ 137 const btstack_audio_source_t * btstack_audio_source_get_instance(void); 138 139 140 /** 141 * @brief Get BTstack Audio Sink Instance 142 * @param btstack_audio_sink implementation 143 */ 144 void btstack_audio_sink_set_instance(const btstack_audio_sink_t * audio_sink_impl); 145 146 /** 147 * @brief Get BTstack Audio Source Instance 148 * @param btstack_audio_source implementation 149 */ 150 void btstack_audio_source_set_instance(const btstack_audio_source_t * audio_source_impl); 151 152 153 // common implementations 154 const btstack_audio_sink_t * btstack_audio_portaudio_sink_get_instance(void); 155 const btstack_audio_source_t * btstack_audio_portaudio_source_get_instance(void); 156 157 const btstack_audio_sink_t * btstack_audio_embedded_sink_get_instance(void); 158 const btstack_audio_source_t * btstack_audio_embedded_source_get_instance(void); 159 160 const btstack_audio_sink_t * btstack_audio_esp32_sink_get_instance(void); 161 // const btstack_audio_source_t * btstack_audio_esp32_source_get_instance(void); 162 163 #if defined __cplusplus 164 } 165 #endif 166 167 #endif 168