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 * @param Recording callback 61 * @return 1 on success 62 */ 63 int (*init)(uint8_t channels, 64 uint32_t samplerate, 65 void (*playback) ( int16_t * buffer, uint16_t num_samples), 66 void (*recording)(const int16_t * buffer, uint16_t num_samples)); 67 68 /** 69 * @brief Start stream 70 */ 71 void (*start_stream)(void); 72 73 /** 74 * @brief Close audio codec 75 */ 76 void (*close)(void); 77 78 } btstack_audio_t; 79 80 /** 81 * @brief Get BTstack Audio Instance 82 * @returns btstack_audio implementation 83 */ 84 const btstack_audio_t * btstack_audio_get_instance(void); 85 86 /** 87 * @brief Get BTstack Audio Instance 88 * @param btstack_audio implementation 89 */ 90 void btstack_audio_set_instance(const btstack_audio_t * audio_impl); 91 92 93 // common implementations 94 const btstack_audio_t * btstack_audio_portaudio_get_instance(void); 95 const btstack_audio_t * btstack_audio_embedded_get_instance(void); 96 const btstack_audio_t * btstack_audio_esp32_get_instance(void); 97 98 #if defined __cplusplus 99 } 100 #endif 101 102 #endif 103