1 /* 2 * Copyright (C) 2018 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 #define __BTSTACK_FILE__ "btstack_audio_embedded.c" 39 40 /* 41 * btstack_audio_embedded.c 42 * 43 * Implementation of btstack_audio.h using hal_audio.h for embedded run loop 44 * 45 */ 46 47 #include "btstack_config.h" 48 #include "btstack_debug.h" 49 #include "btstack_audio.h" 50 #include "btstack_run_loop_embedded.h" 51 #include "hal_audio.h" 52 53 // allow to compile all files in embedded folder even if there's no audio support 54 #ifdef HAVE_HAL_AUDIO 55 56 #define DRIVER_POLL_INTERVAL_MS 5 57 58 // client 59 static void (*playback_callback)(int16_t * buffer, uint16_t num_samples); 60 static void (*recording_callback)(const int16_t * buffer, uint16_t num_samples); 61 62 // timer to fill output ring buffer 63 static btstack_timer_source_t driver_timer; 64 65 static volatile unsigned int output_buffer_to_play; 66 static unsigned int output_buffer_to_fill; 67 static unsigned int output_buffer_count; 68 static unsigned int output_buffer_samples; 69 70 static void btstack_audio_audio_played(uint8_t buffer_index){ 71 output_buffer_to_play = (buffer_index + 1) % output_buffer_count; 72 } 73 74 static void btstack_audio_audio_recorded(const int16_t * samples, uint16_t num_samples){ 75 UNUSED(samples); 76 UNUSED(num_samples); 77 } 78 79 static void driver_timer_handler(btstack_timer_source_t * ts){ 80 81 // playback buffer ready to fill 82 if (playback_callback && output_buffer_to_play != output_buffer_to_fill){ 83 // fill buffer 84 int16_t * buffer = hal_audio_get_output_buffer(output_buffer_to_fill); 85 (*playback_callback)(buffer, output_buffer_samples); 86 87 // next 88 output_buffer_to_fill = (output_buffer_to_fill + 1 ) % output_buffer_count; 89 } 90 91 // recording buffer ready to process 92 if (recording_callback){ 93 } 94 95 // re-set timer 96 btstack_run_loop_set_timer(ts, DRIVER_POLL_INTERVAL_MS); 97 btstack_run_loop_add_timer(ts); 98 } 99 100 static int btstack_audio_embedded_init( 101 uint8_t channels, 102 uint32_t samplerate, 103 void (*playback)(int16_t * buffer, uint16_t num_samples), 104 void (*recording)(const int16_t * buffer, uint16_t num_samples) 105 ){ 106 playback_callback = playback; 107 recording_callback = recording; 108 109 void (*buffer_played_callback) (uint8_t buffer_index) = NULL; 110 void (*buffer_recorded_callback)(const int16_t * buffer, uint16_t num_samples) = NULL; 111 if (playback) { 112 buffer_played_callback = &btstack_audio_audio_played; 113 } 114 if (recording) { 115 buffer_recorded_callback = &btstack_audio_audio_recorded; 116 } 117 hal_audio_init(channels, samplerate, buffer_played_callback, buffer_recorded_callback); 118 119 return 0; 120 } 121 122 static void btstack_audio_embedded_start_stream(void){ 123 124 if (playback_callback){ 125 126 output_buffer_count = hal_audio_get_num_output_buffers(); 127 output_buffer_samples = hal_audio_get_num_output_buffer_samples(); 128 129 // pre-fill HAL buffers 130 uint16_t i; 131 for (i=0;i<output_buffer_count;i++){ 132 int16_t * buffer = hal_audio_get_output_buffer(i); 133 (*playback_callback)(buffer, output_buffer_samples); 134 } 135 136 output_buffer_to_play = 0; 137 output_buffer_to_fill = 0; 138 } 139 140 // TODO: setup input 141 142 // start playback 143 hal_audio_start(); 144 145 // start timer 146 btstack_run_loop_set_timer_handler(&driver_timer, &driver_timer_handler); 147 btstack_run_loop_set_timer(&driver_timer, DRIVER_POLL_INTERVAL_MS); 148 btstack_run_loop_add_timer(&driver_timer); 149 } 150 151 static void btstack_audio_embedded_close(void){ 152 // stop timer 153 btstack_run_loop_remove_timer(&driver_timer); 154 // close HAL 155 hal_audio_close(); 156 } 157 158 static const btstack_audio_t btstack_audio_embedded = { 159 /* int (*init)(..);*/ &btstack_audio_embedded_init, 160 /* void (*start_stream(void));*/ &btstack_audio_embedded_start_stream, 161 /* void (*close)(void); */ &btstack_audio_embedded_close 162 }; 163 164 const btstack_audio_t * btstack_audio_embedded_get_instance(void){ 165 return &btstack_audio_embedded; 166 } 167 168 #endif 169