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_DMA_H 39 #define __BTSTACK_AUDIO_DMA_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 Start stream 68 */ 69 void (*start_stream)(void); 70 71 /** 72 * @brief Stop stream 73 */ 74 void (*stop_stream)(void); 75 76 /** 77 * @brief Close audio codec 78 */ 79 void (*close)(void); 80 81 } btstack_audio_sink_t; 82 83 84 typedef struct { 85 86 /** 87 * @brief Setup audio codec for specified samplerate and number of channels 88 * @param Channels (1=mono, 2=stereo) 89 * @param Sample rate 90 * @param Recording callback 91 * @return 1 on success 92 */ 93 int (*init)(uint8_t channels, 94 uint32_t samplerate, 95 void (*recording)(const int16_t * buffer, uint16_t num_samples)); 96 97 /** 98 * @brief Start stream 99 */ 100 void (*start_stream)(void); 101 102 /** 103 * @brief Stop stream 104 */ 105 void (*stop_stream)(void); 106 107 /** 108 * @brief Close audio codec 109 */ 110 void (*close)(void); 111 112 } btstack_audio_source_t; 113 114 115 /** 116 * @brief Get BTstack Audio Sink Instance 117 * @returns btstack_audio_sink implementation 118 */ 119 const btstack_audio_sink_t * btstack_audio_sink_get_instance(void); 120 121 /** 122 * @brief Get BTstack Audio Source Instance 123 * @returns btstack_audio_source implementation 124 */ 125 const btstack_audio_source_t * btstack_audio_source_get_instance(void); 126 127 128 /** 129 * @brief Get BTstack Audio Sink Instance 130 * @param btstack_audio_sink implementation 131 */ 132 void btstack_audio_sink_set_instance(const btstack_audio_sink_t * audio_sink_impl); 133 134 /** 135 * @brief Get BTstack Audio Source Instance 136 * @param btstack_audio_source implementation 137 */ 138 void btstack_audio_source_set_instance(const btstack_audio_source_t * audio_source_impl); 139 140 141 // common implementations 142 const btstack_audio_sink_t * btstack_audio_portaudio_sink_get_instance(void); 143 const btstack_audio_source_t * btstack_audio_portaudio_source_get_instance(void); 144 145 //const btstack_audio_t * btstack_audio_embedded_get_instance(void); 146 //const btstack_audio_t * btstack_audio_esp32_get_instance(void); 147 148 #if defined __cplusplus 149 } 150 #endif 151 152 #endif 153