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_sink; 64 static btstack_timer_source_t driver_timer_source; 65 66 static volatile unsigned int output_buffer_to_play; 67 static unsigned int output_buffer_to_fill; 68 static unsigned int output_buffer_count; 69 static unsigned int output_buffer_samples; 70 71 static volatile int input_buffer_ready; 72 static volatile const int16_t * input_buffer_samples; 73 static volatile uint16_t input_buffer_num_samples; 74 75 static void btstack_audio_audio_played(uint8_t buffer_index){ 76 output_buffer_to_play = (buffer_index + 1) % output_buffer_count; 77 } 78 79 static void btstack_audio_audio_recorded(const int16_t * samples, uint16_t num_samples){ 80 input_buffer_samples = samples; 81 input_buffer_num_samples = num_samples; 82 input_buffer_ready = 1; 83 } 84 85 static void driver_timer_handler_sink(btstack_timer_source_t * ts){ 86 87 // playback buffer ready to fill 88 if (output_buffer_to_play != output_buffer_to_fill){ 89 int16_t * buffer = hal_audio_sink_get_output_buffer(output_buffer_to_fill); 90 (*playback_callback)(buffer, output_buffer_samples); 91 92 // next 93 output_buffer_to_fill = (output_buffer_to_fill + 1 ) % output_buffer_count; 94 } 95 96 // re-set timer 97 btstack_run_loop_set_timer(ts, DRIVER_POLL_INTERVAL_MS); 98 btstack_run_loop_add_timer(ts); 99 } 100 101 static void driver_timer_handler_source(btstack_timer_source_t * ts){ 102 // deliver samples if ready 103 if (input_buffer_ready){ 104 (*recording_callback)((const int16_t *)input_buffer_samples, input_buffer_num_samples); 105 input_buffer_ready = 0; 106 } 107 108 // re-set timer 109 btstack_run_loop_set_timer(ts, DRIVER_POLL_INTERVAL_MS); 110 btstack_run_loop_add_timer(ts); 111 } 112 113 static int btstack_audio_embedded_sink_init( 114 uint8_t channels, 115 uint32_t samplerate, 116 void (*playback)(int16_t * buffer, uint16_t num_samples) 117 ){ 118 if (!playback){ 119 log_error("No playback callback"); 120 return 1; 121 } 122 123 playback_callback = playback; 124 125 hal_audio_sink_init(channels, samplerate, &btstack_audio_audio_played); 126 127 return 0; 128 } 129 130 static int btstack_audio_embedded_source_init( 131 uint8_t channels, 132 uint32_t samplerate, 133 void (*recording)(const int16_t * buffer, uint16_t num_samples) 134 ){ 135 if (!recording){ 136 log_error("No recording callback"); 137 return 1; 138 } 139 140 recording_callback = recording; 141 142 hal_audio_source_init(channels, samplerate, &btstack_audio_audio_recorded); 143 144 return 0; 145 } 146 147 static void btstack_audio_embedded_sink_start_stream(void){ 148 output_buffer_count = hal_audio_sink_get_num_output_buffers(); 149 output_buffer_samples = hal_audio_sink_get_num_output_buffer_samples(); 150 151 // pre-fill HAL buffers 152 uint16_t i; 153 for (i=0;i<output_buffer_count;i++){ 154 int16_t * buffer = hal_audio_sink_get_output_buffer(i); 155 (*playback_callback)(buffer, output_buffer_samples); 156 } 157 158 output_buffer_to_play = 0; 159 output_buffer_to_fill = 0; 160 161 // start playback 162 hal_audio_sink_start(); 163 164 // start timer 165 btstack_run_loop_set_timer_handler(&driver_timer_sink, &driver_timer_handler_sink); 166 btstack_run_loop_set_timer(&driver_timer_sink, DRIVER_POLL_INTERVAL_MS); 167 btstack_run_loop_add_timer(&driver_timer_sink); 168 } 169 170 static void btstack_audio_embedded_source_start_stream(void){ 171 // just started, no data ready 172 input_buffer_ready = 0; 173 174 // start recording 175 hal_audio_source_start(); 176 177 // start timer 178 btstack_run_loop_set_timer_handler(&driver_timer_source, &driver_timer_handler_source); 179 btstack_run_loop_set_timer(&driver_timer_source, DRIVER_POLL_INTERVAL_MS); 180 btstack_run_loop_add_timer(&driver_timer_source); 181 } 182 183 static void btstack_audio_embedded_sink_close(void){ 184 // stop timer 185 btstack_run_loop_remove_timer(&driver_timer_sink); 186 // close HAL 187 hal_audio_sink_close(); 188 } 189 190 static void btstack_audio_embedded_source_close(void){ 191 // stop timer 192 btstack_run_loop_remove_timer(&driver_timer_source); 193 // close HAL 194 hal_audio_source_close(); 195 } 196 197 static const btstack_audio_sink_t btstack_audio_embedded_sink = { 198 /* int (*init)(..);*/ &btstack_audio_embedded_sink_init, 199 /* void (*start_stream(void));*/ &btstack_audio_embedded_sink_start_stream, 200 /* void (*close)(void); */ &btstack_audio_embedded_sink_close 201 }; 202 203 static const btstack_audio_source_t btstack_audio_embedded_source = { 204 /* int (*init)(..);*/ &btstack_audio_embedded_source_init, 205 /* void (*start_stream(void));*/ &btstack_audio_embedded_source_start_stream, 206 /* void (*close)(void); */ &btstack_audio_embedded_source_close 207 }; 208 209 const btstack_audio_sink_t * btstack_audio_embedded_sink_get_instance(void){ 210 return &btstack_audio_embedded_sink; 211 } 212 213 const btstack_audio_source_t * btstack_audio_embedded_source_get_instance(void){ 214 return &btstack_audio_embedded_source; 215 } 216 217 #endif 218