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 int source_active; 76 static int sink_active; 77 78 static void btstack_audio_audio_played(uint8_t buffer_index){ 79 output_buffer_to_play = (buffer_index + 1) % output_buffer_count; 80 } 81 82 static void btstack_audio_audio_recorded(const int16_t * samples, uint16_t num_samples){ 83 input_buffer_samples = samples; 84 input_buffer_num_samples = num_samples; 85 input_buffer_ready = 1; 86 } 87 88 static void driver_timer_handler_sink(btstack_timer_source_t * ts){ 89 90 // playback buffer ready to fill 91 if (output_buffer_to_play != output_buffer_to_fill){ 92 int16_t * buffer = hal_audio_sink_get_output_buffer(output_buffer_to_fill); 93 (*playback_callback)(buffer, output_buffer_samples); 94 95 // next 96 output_buffer_to_fill = (output_buffer_to_fill + 1 ) % output_buffer_count; 97 } 98 99 // re-set timer 100 btstack_run_loop_set_timer(ts, DRIVER_POLL_INTERVAL_MS); 101 btstack_run_loop_add_timer(ts); 102 } 103 104 static void driver_timer_handler_source(btstack_timer_source_t * ts){ 105 // deliver samples if ready 106 if (input_buffer_ready){ 107 (*recording_callback)((const int16_t *)input_buffer_samples, input_buffer_num_samples); 108 input_buffer_ready = 0; 109 } 110 111 // re-set timer 112 btstack_run_loop_set_timer(ts, DRIVER_POLL_INTERVAL_MS); 113 btstack_run_loop_add_timer(ts); 114 } 115 116 static int btstack_audio_embedded_sink_init( 117 uint8_t channels, 118 uint32_t samplerate, 119 void (*playback)(int16_t * buffer, uint16_t num_samples) 120 ){ 121 if (!playback){ 122 log_error("No playback callback"); 123 return 1; 124 } 125 126 playback_callback = playback; 127 128 hal_audio_sink_init(channels, samplerate, &btstack_audio_audio_played); 129 130 return 0; 131 } 132 133 static int btstack_audio_embedded_source_init( 134 uint8_t channels, 135 uint32_t samplerate, 136 void (*recording)(const int16_t * buffer, uint16_t num_samples) 137 ){ 138 if (!recording){ 139 log_error("No recording callback"); 140 return 1; 141 } 142 143 recording_callback = recording; 144 145 hal_audio_source_init(channels, samplerate, &btstack_audio_audio_recorded); 146 147 return 0; 148 } 149 150 static void btstack_audio_embedded_sink_start_stream(void){ 151 output_buffer_count = hal_audio_sink_get_num_output_buffers(); 152 output_buffer_samples = hal_audio_sink_get_num_output_buffer_samples(); 153 154 // pre-fill HAL buffers 155 uint16_t i; 156 for (i=0;i<output_buffer_count;i++){ 157 int16_t * buffer = hal_audio_sink_get_output_buffer(i); 158 (*playback_callback)(buffer, output_buffer_samples); 159 } 160 161 output_buffer_to_play = 0; 162 output_buffer_to_fill = 0; 163 164 // start playback 165 hal_audio_sink_start(); 166 167 // start timer 168 btstack_run_loop_set_timer_handler(&driver_timer_sink, &driver_timer_handler_sink); 169 btstack_run_loop_set_timer(&driver_timer_sink, DRIVER_POLL_INTERVAL_MS); 170 btstack_run_loop_add_timer(&driver_timer_sink); 171 172 // state 173 sink_active = 1; 174 } 175 176 static void btstack_audio_embedded_source_start_stream(void){ 177 // just started, no data ready 178 input_buffer_ready = 0; 179 180 // start recording 181 hal_audio_source_start(); 182 183 // start timer 184 btstack_run_loop_set_timer_handler(&driver_timer_source, &driver_timer_handler_source); 185 btstack_run_loop_set_timer(&driver_timer_source, DRIVER_POLL_INTERVAL_MS); 186 btstack_run_loop_add_timer(&driver_timer_source); 187 188 // state 189 source_active = 1; 190 } 191 192 static void btstack_audio_embedded_sink_stop_stream(void){ 193 // stop stream 194 hal_audio_sink_stop(); 195 // stop timer 196 btstack_run_loop_remove_timer(&driver_timer_sink); 197 // state 198 sink_active = 0; 199 } 200 201 static void btstack_audio_embedded_source_stop_stream(void){ 202 // stop stream 203 hal_audio_source_stop(); 204 // stop timer 205 btstack_run_loop_remove_timer(&driver_timer_source); 206 // state 207 source_active = 0; 208 } 209 210 static void btstack_audio_embedded_sink_close(void){ 211 // stop stream if needed 212 if (sink_active){ 213 btstack_audio_embedded_sink_stop_stream(); 214 } 215 // close HAL 216 hal_audio_sink_close(); 217 } 218 219 static void btstack_audio_embedded_source_close(void){ 220 // stop stream if needed 221 if (source_active){ 222 btstack_audio_embedded_source_stop_stream(); 223 } 224 // close HAL 225 hal_audio_source_close(); 226 } 227 228 static const btstack_audio_sink_t btstack_audio_embedded_sink = { 229 /* int (*init)(..);*/ &btstack_audio_embedded_sink_init, 230 /* void (*start_stream(void));*/ &btstack_audio_embedded_sink_start_stream, 231 /* void (*stop_stream)(void) */ &btstack_audio_embedded_sink_stop_stream, 232 /* void (*close)(void); */ &btstack_audio_embedded_sink_close 233 }; 234 235 static const btstack_audio_source_t btstack_audio_embedded_source = { 236 /* int (*init)(..);*/ &btstack_audio_embedded_source_init, 237 /* void (*start_stream(void));*/ &btstack_audio_embedded_source_start_stream, 238 /* void (*stop_stream)(void) */ &btstack_audio_embedded_source_stop_stream, 239 /* void (*close)(void); */ &btstack_audio_embedded_source_close 240 }; 241 242 const btstack_audio_sink_t * btstack_audio_embedded_sink_get_instance(void){ 243 return &btstack_audio_embedded_sink; 244 } 245 246 const btstack_audio_source_t * btstack_audio_embedded_source_get_instance(void){ 247 return &btstack_audio_embedded_source; 248 } 249 250 #endif 251