1 /* 2 * Copyright (C) {copyright_year} 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 BLUEKITCHEN 24 * GMBH 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__ "le_audio_demo_util_sink.c" 39 40 #include <stdio.h> 41 42 #include "le_audio_demo_util_sink.h" 43 44 #include "btstack_bool.h" 45 #include "btstack_config.h" 46 #include <btstack_debug.h> 47 #include <printf.h> 48 49 #include "hci.h" 50 #include "btstack_audio.h" 51 #include "btstack_lc3_google.h" 52 #include "btstack_lc3plus_fraunhofer.h" 53 54 #include "btstack_sample_rate_compensation.h" 55 #include "btstack_resample.h" 56 57 #include "hxcmod.h" 58 #include "mods/mod.h" 59 60 #ifdef HAVE_POSIX_FILE_IO 61 #include "wav_util.h" 62 #include "btstack_ring_buffer.h" 63 64 #endif 65 66 //#define DEBUG_PLC 67 #ifdef DEBUG_PLC 68 #define printf_plc(...) { \ 69 printf(__VA_ARGS__); \ 70 log_info(__VA_ARGS__);\ 71 } 72 #else 73 #define printf_plc(...) (void)(0); 74 #endif 75 76 #define MAX_CHANNELS 2 77 #define MAX_SAMPLES_PER_FRAME 480 78 #define MAX_LC3_FRAME_BYTES 155 79 80 // playback 81 #define MAX_NUM_LC3_FRAMES 15 82 #define MAX_BYTES_PER_SAMPLE 4 83 #define PLAYBACK_BUFFER_SIZE (MAX_NUM_LC3_FRAMES * MAX_SAMPLES_PER_FRAME * MAX_CHANNELS * MAX_BYTES_PER_SAMPLE) 84 #define PLAYBACK_START_MS (MAX_NUM_LC3_FRAMES * 20 / 3) 85 86 #define ANSI_COLOR_RED "\x1b[31m" 87 #define ANSI_COLOR_GREEN "\x1b[32m" 88 #define ANSI_COLOR_YELLOW "\x1b[33m" 89 #define ANSI_COLOR_BLUE "\x1b[34m" 90 #define ANSI_COLOR_MAGENTA "\x1b[35m" 91 #define ANSI_COLOR_CYAN "\x1b[36m" 92 #define ANSI_COLOR_RESET "\x1b[0m" 93 94 // SINK 95 96 static const char * le_audio_demo_sink_filename_wav; 97 static btstack_sample_rate_compensation_t sample_rate_compensation; 98 static btstack_resample_t resample_instance; 99 static bool sink_receive_streaming; 100 101 static int16_t pcm_resample[MAX_CHANNELS * MAX_SAMPLES_PER_FRAME * 2]; 102 103 104 static btstack_lc3_frame_duration_t le_audio_demo_sink_frame_duration; 105 static hci_iso_type_t le_audio_demo_sink_type; 106 107 static uint32_t le_audio_demo_sink_sampling_frequency_hz; 108 static uint16_t le_audio_demo_sink_num_samples_per_frame; 109 static uint8_t le_audio_demo_sink_num_streams; 110 static uint8_t le_audio_demo_sink_num_channels_per_stream; 111 static uint8_t le_audio_demo_sink_num_channels; 112 static uint16_t le_audio_demo_sink_octets_per_frame; 113 static uint16_t le_audio_demo_sink_iso_interval_1250us; 114 static uint8_t le_audio_demo_sink_flush_timeout; 115 static uint8_t le_audio_demo_sink_pre_transmission_offset; 116 117 // playback 118 static uint16_t playback_start_threshold_bytes; 119 static bool playback_active; 120 static uint8_t playback_buffer_storage[PLAYBACK_BUFFER_SIZE]; 121 static btstack_ring_buffer_t playback_buffer; 122 123 // PLC 124 static bool stream_last_packet_received[MAX_CHANNELS]; 125 static uint16_t stream_last_packet_sequence[MAX_CHANNELS]; 126 static uint16_t group_last_packet_sequence; 127 static bool group_last_packet_received; 128 static uint16_t plc_timeout_initial_ms; 129 static uint16_t plc_timeout_subsequent_ms; 130 131 static uint32_t le_audio_demo_sink_lc3_frames; 132 static uint32_t samples_received; 133 static uint32_t samples_played; 134 static uint32_t samples_dropped; 135 136 static btstack_timer_source_t next_packet_timer; 137 138 // lc3 decoder 139 static bool le_audio_demo_lc3plus_decoder_requested = false; 140 static const btstack_lc3_decoder_t * lc3_decoder; 141 static int16_t pcm[MAX_CHANNELS * MAX_SAMPLES_PER_FRAME]; 142 static bool have_pcm[MAX_CHANNELS]; 143 144 static btstack_lc3_decoder_google_t google_decoder_contexts[MAX_CHANNELS]; 145 #ifdef HAVE_LC3PLUS 146 static btstack_lc3plus_fraunhofer_decoder_t fraunhofer_decoder_contexts[MAX_CHANNELS]; 147 #endif 148 static void * decoder_contexts[MAX_CHANNELS]; 149 150 static void le_audio_connection_sink_playback(int16_t * buffer, uint16_t num_samples){ 151 // called from lower-layer but guaranteed to be on main thread 152 log_info("Playback: need %u, have %u", num_samples, btstack_ring_buffer_bytes_available(&playback_buffer) / (le_audio_demo_sink_num_channels * 2)); 153 154 samples_played += num_samples; 155 156 uint32_t bytes_needed = num_samples * le_audio_demo_sink_num_channels * 2; 157 if (playback_active == false){ 158 if (btstack_ring_buffer_bytes_available(&playback_buffer) >= playback_start_threshold_bytes) { 159 log_info("Playback started"); 160 playback_active = true; 161 } 162 } else { 163 if (bytes_needed > btstack_ring_buffer_bytes_available(&playback_buffer)) { 164 log_info("Playback underrun"); 165 printf("Playback Underrun\n"); 166 // empty buffer 167 uint32_t bytes_read; 168 btstack_ring_buffer_read(&playback_buffer, (uint8_t *) buffer, bytes_needed, &bytes_read); 169 playback_active = false; 170 } 171 } 172 173 if (playback_active){ 174 uint32_t bytes_read; 175 btstack_ring_buffer_read(&playback_buffer, (uint8_t *) buffer, bytes_needed, &bytes_read); 176 btstack_assert(bytes_read == bytes_needed); 177 } else { 178 memset(buffer, 0, bytes_needed); 179 } 180 } 181 182 static void store_samples_in_ringbuffer(void){ 183 // check if we have all channels 184 uint8_t channel; 185 for (channel = 0; channel < le_audio_demo_sink_num_channels; channel++){ 186 if (have_pcm[channel] == false) return; 187 } 188 #ifdef HAVE_POSIX_FILE_IO 189 // write wav samples 190 wav_writer_write_int16(le_audio_demo_sink_num_channels * le_audio_demo_sink_num_samples_per_frame, pcm); 191 #endif 192 // store samples in playback buffer 193 samples_received += le_audio_demo_sink_num_samples_per_frame; 194 uint32_t resampled_frames = btstack_resample_block(&resample_instance, pcm, le_audio_demo_sink_num_samples_per_frame, pcm_resample); 195 uint32_t bytes_to_store = resampled_frames * le_audio_demo_sink_num_channels * 2; 196 197 if (btstack_ring_buffer_bytes_free(&playback_buffer) >= bytes_to_store) { 198 btstack_ring_buffer_write(&playback_buffer, (uint8_t *) pcm_resample, bytes_to_store); 199 log_info("Samples in playback buffer %5u", btstack_ring_buffer_bytes_available(&playback_buffer) / (le_audio_demo_sink_num_channels * 2)); 200 } else { 201 printf("Samples dropped\n"); 202 samples_dropped += le_audio_demo_sink_num_samples_per_frame; 203 } 204 memset(have_pcm, 0, sizeof(have_pcm)); 205 } 206 207 static void plc_do(uint8_t stream_index) { 208 // inject packet 209 uint8_t tmp_BEC_detect; 210 uint8_t BFI = 1; 211 uint8_t i; 212 for (i = 0; i < le_audio_demo_sink_num_channels_per_stream; i++){ 213 uint8_t effective_channel = stream_index + i; 214 (void) lc3_decoder->decode_signed_16(decoder_contexts[effective_channel], NULL, BFI, 215 &pcm[effective_channel], le_audio_demo_sink_num_channels, 216 &tmp_BEC_detect); 217 } 218 // and store in ringbuffer when PCM for all channels is available 219 store_samples_in_ringbuffer(); 220 } 221 222 // 223 // Perform PLC for packets missing in previous intervals 224 // 225 // assumptions: 226 // - packet sequence number is monotonic increasing 227 // - if packet with seq nr x is received, all packets with smaller seq number are either received or missed 228 static void plc_check(uint16_t packet_sequence_number) { 229 while (group_last_packet_sequence != packet_sequence_number){ 230 uint8_t i; 231 for (i=0;i<le_audio_demo_sink_num_streams;i++){ 232 // deal with first packet missing. inject silent samples, pcm buffer is memset to zero at start 233 if (stream_last_packet_received[i] == false){ 234 printf_plc("- ISO #%u, very first packet missing\n", i); 235 have_pcm[i] = true; 236 store_samples_in_ringbuffer(); 237 238 stream_last_packet_received[i] = true; 239 stream_last_packet_sequence[i] = group_last_packet_sequence; 240 continue; 241 } 242 243 // missing packet if big sequence counter is higher than bis sequence counter 244 if (btstack_time16_delta(group_last_packet_sequence, stream_last_packet_sequence[i]) > 0) { 245 printf_plc("- ISO #%u, PLC for %u\n", i, group_last_packet_sequence); 246 plc_do(i); 247 btstack_assert((stream_last_packet_sequence[i] + 1) == group_last_packet_sequence); 248 stream_last_packet_sequence[i] = group_last_packet_sequence; 249 } 250 } 251 group_last_packet_sequence++; 252 } 253 } 254 255 static void plc_timeout(btstack_timer_source_t * timer) { 256 // Restart timer. This will loose sync with ISO interval, but if we stop caring if we loose that many packets 257 btstack_run_loop_set_timer(timer, plc_timeout_subsequent_ms); 258 btstack_run_loop_set_timer_handler(timer, plc_timeout); 259 btstack_run_loop_add_timer(timer); 260 261 switch (le_audio_demo_sink_type){ 262 case HCI_ISO_TYPE_CIS: 263 // assume no packet received in iso interval => FT packets missed 264 printf_plc("PLC: timeout cis, group %u, FT %u", group_last_packet_sequence, le_audio_demo_sink_flush_timeout); 265 plc_check(group_last_packet_sequence + le_audio_demo_sink_flush_timeout); 266 break; 267 case HCI_ISO_TYPE_BIS: 268 // assume PTO not used => 1 packet missed 269 plc_check(group_last_packet_sequence + 1); 270 break; 271 default: 272 btstack_unreachable(); 273 break; 274 } 275 } 276 277 void le_audio_demo_util_sink_init(const char * filename_wav){ 278 le_audio_demo_sink_filename_wav = filename_wav; 279 } 280 281 void le_audio_demo_util_sink_enable_lc3plus(bool enable){ 282 le_audio_demo_lc3plus_decoder_requested = enable; 283 } 284 285 static void setup_lc3_decoder(bool use_lc3plus_decoder){ 286 uint8_t channel; 287 for (channel = 0 ; channel < le_audio_demo_sink_num_channels ; channel++){ 288 // pick decoder 289 void * decoder_context = NULL; 290 #ifdef HAVE_LC3PLUS 291 if (use_lc3plus_decoder){ 292 decoder_context = &fraunhofer_decoder_contexts[channel]; 293 lc3_decoder = btstack_lc3plus_fraunhofer_decoder_init_instance(decoder_context); 294 } 295 else 296 #endif 297 { 298 decoder_context = &google_decoder_contexts[channel]; 299 lc3_decoder = btstack_lc3_decoder_google_init_instance(decoder_context); 300 } 301 decoder_contexts[channel] = decoder_context; 302 lc3_decoder->configure(decoder_context, le_audio_demo_sink_sampling_frequency_hz, le_audio_demo_sink_frame_duration, le_audio_demo_sink_octets_per_frame); 303 } 304 btstack_assert(le_audio_demo_sink_num_samples_per_frame <= MAX_SAMPLES_PER_FRAME); 305 } 306 307 void le_audio_demo_util_sink_configure_general(uint8_t num_streams, uint8_t num_channels_per_stream, 308 uint32_t sampling_frequency_hz, 309 btstack_lc3_frame_duration_t frame_duration, uint16_t octets_per_frame, 310 uint32_t iso_interval_1250us) { 311 le_audio_demo_sink_sampling_frequency_hz = sampling_frequency_hz; 312 le_audio_demo_sink_frame_duration = frame_duration; 313 le_audio_demo_sink_octets_per_frame = octets_per_frame; 314 le_audio_demo_sink_iso_interval_1250us = iso_interval_1250us; 315 le_audio_demo_sink_num_streams = num_streams; 316 le_audio_demo_sink_num_channels_per_stream = num_channels_per_stream; 317 318 sink_receive_streaming = false; 319 320 le_audio_demo_sink_num_channels = le_audio_demo_sink_num_streams * le_audio_demo_sink_num_channels_per_stream; 321 btstack_assert((le_audio_demo_sink_num_channels == 1) || (le_audio_demo_sink_num_channels == 2)); 322 323 le_audio_demo_sink_lc3_frames = 0; 324 325 group_last_packet_received = false; 326 uint8_t i; 327 for (i=0;i<MAX_CHANNELS;i++){ 328 stream_last_packet_received[i] = false; 329 have_pcm[i] = false; 330 } 331 332 le_audio_demo_sink_num_samples_per_frame = btstack_lc3_samples_per_frame(le_audio_demo_sink_sampling_frequency_hz, le_audio_demo_sink_frame_duration); 333 334 // switch to lc3plus if requested and possible 335 bool use_lc3plus_decoder = le_audio_demo_lc3plus_decoder_requested && (frame_duration == BTSTACK_LC3_FRAME_DURATION_10000US); 336 337 // init decoder 338 setup_lc3_decoder(use_lc3plus_decoder); 339 340 printf("Configure: %u streams, %u channels per stream, sampling rate %u, samples per frame %u, lc3plus %u\n", 341 num_streams, num_channels_per_stream, sampling_frequency_hz, le_audio_demo_sink_num_samples_per_frame, use_lc3plus_decoder); 342 343 #ifdef HAVE_POSIX_FILE_IO 344 // create wav file 345 printf("WAV file: %s\n", le_audio_demo_sink_filename_wav); 346 wav_writer_open(le_audio_demo_sink_filename_wav, le_audio_demo_sink_num_channels, le_audio_demo_sink_sampling_frequency_hz); 347 #endif 348 349 // init playback buffer 350 btstack_ring_buffer_init(&playback_buffer, playback_buffer_storage, PLAYBACK_BUFFER_SIZE); 351 352 // calc start threshold in bytes for PLAYBACK_START_MS 353 playback_start_threshold_bytes = (sampling_frequency_hz / 1000 * PLAYBACK_START_MS) * le_audio_demo_sink_num_channels * 2; 354 355 // start playback 356 const btstack_audio_sink_t * sink = btstack_audio_sink_get_instance(); 357 if (sink != NULL){ 358 btstack_sample_rate_compensation_reset( &sample_rate_compensation, btstack_run_loop_get_time_ms() ); 359 btstack_resample_init(&resample_instance, le_audio_demo_sink_num_channels_per_stream); 360 sink->init(le_audio_demo_sink_num_channels, le_audio_demo_sink_sampling_frequency_hz, le_audio_connection_sink_playback); 361 sink->start_stream(); 362 } 363 } 364 365 void le_audio_demo_util_sink_configure_unicast(uint8_t num_streams, uint8_t num_channels_per_stream, uint32_t sampling_frequency_hz, 366 btstack_lc3_frame_duration_t frame_duration, uint16_t octets_per_frame, 367 uint32_t iso_interval_1250us, uint8_t flush_timeout){ 368 le_audio_demo_sink_type = HCI_ISO_TYPE_CIS; 369 le_audio_demo_sink_flush_timeout = flush_timeout; 370 371 // set playback start: FT * ISO Interval + max(10 ms, 1/2 ISO Interval) 372 uint16_t playback_start_ms = flush_timeout * (iso_interval_1250us * 5 / 4) + btstack_max(10, iso_interval_1250us * 5 / 8); 373 uint16_t playback_start_samples = sampling_frequency_hz / 1000 * playback_start_ms; 374 playback_start_threshold_bytes = playback_start_samples * num_streams * num_channels_per_stream * 2; 375 printf("Playback: start %u ms (%u samples, %u bytes)\n", playback_start_ms, playback_start_samples, playback_start_threshold_bytes); 376 377 // set subsequent plc timeout: FT * ISO Interval 378 plc_timeout_subsequent_ms = flush_timeout * iso_interval_1250us * 5 / 4; 379 380 // set initial plc timeout:FT * ISO Interval + 4 ms 381 plc_timeout_initial_ms = plc_timeout_subsequent_ms + 4; 382 383 printf("PLC: initial timeout %u ms\n", plc_timeout_initial_ms); 384 printf("PLC: subsequent timeout %u ms\n", plc_timeout_subsequent_ms); 385 386 le_audio_demo_util_sink_configure_general(num_streams, num_channels_per_stream, sampling_frequency_hz, 387 frame_duration, octets_per_frame, iso_interval_1250us); 388 } 389 390 void le_audio_demo_util_sink_configure_broadcast(uint8_t num_streams, uint8_t num_channels_per_stream, uint32_t sampling_frequency_hz, 391 btstack_lc3_frame_duration_t frame_duration, uint16_t octets_per_frame, 392 uint32_t iso_interval_1250us, uint8_t pre_transmission_offset) { 393 le_audio_demo_sink_type = HCI_ISO_TYPE_BIS; 394 le_audio_demo_sink_pre_transmission_offset = pre_transmission_offset; 395 396 // set playback start: ISO Interval + 10 ms 397 uint16_t playback_start_ms = (iso_interval_1250us * 5 / 4) + 10; 398 uint16_t playback_start_samples = sampling_frequency_hz / 1000 * playback_start_ms; 399 playback_start_threshold_bytes = playback_start_samples * num_streams * num_channels_per_stream * 2; 400 printf("Playback: start %u ms (%u samples, %u bytes)\n", playback_start_ms, playback_start_samples, playback_start_threshold_bytes); 401 402 // set subsequent plc timeout: ISO Interval 403 plc_timeout_subsequent_ms = iso_interval_1250us * 5 / 4; 404 405 // set initial plc timeout: ISO Interval + 4 ms 406 plc_timeout_initial_ms = plc_timeout_subsequent_ms + 4; 407 408 printf("PLC: initial timeout %u ms\n", plc_timeout_initial_ms); 409 printf("PLC: subsequent timeout %u ms\n", plc_timeout_subsequent_ms); 410 411 le_audio_demo_util_sink_configure_unicast(num_streams, num_channels_per_stream, sampling_frequency_hz, frame_duration, 412 octets_per_frame, iso_interval_1250us, pre_transmission_offset); 413 } 414 415 void le_audio_demo_util_sink_receive(uint8_t stream_index, uint8_t *packet, uint16_t size) { 416 uint16_t header = little_endian_read_16(packet, 0); 417 hci_con_handle_t con_handle = header & 0x0fff; 418 uint8_t pb_flag = (header >> 12) & 3; 419 uint8_t ts_flag = (header >> 14) & 1; 420 uint16_t iso_load_len = little_endian_read_16(packet, 2); 421 422 uint16_t offset = 4; 423 uint32_t time_stamp = 0; 424 if (ts_flag){ 425 time_stamp = little_endian_read_32(packet, offset); 426 offset += 4; 427 } 428 429 uint32_t receive_time_ms = btstack_run_loop_get_time_ms(); 430 431 uint16_t packet_sequence_number = little_endian_read_16(packet, offset); 432 offset += 2; 433 434 uint16_t header_2 = little_endian_read_16(packet, offset); 435 uint16_t iso_sdu_length = header_2 & 0x3fff; 436 uint8_t packet_status_flag = (uint8_t) (header_2 >> 14); 437 offset += 2; 438 439 // avoid warning for (yet) unused fields 440 UNUSED(con_handle); 441 UNUSED(pb_flag); 442 UNUSED(iso_load_len); 443 UNUSED(packet_status_flag); 444 445 // start with first packet on first stream 446 if (group_last_packet_received == false){ 447 if (stream_index != 0){ 448 printf("Ignore first packet for second stream\n"); 449 return; 450 } 451 group_last_packet_received = true; 452 group_last_packet_sequence = packet_sequence_number; 453 } 454 455 if (stream_last_packet_received[stream_index]) { 456 printf_plc("ISO #%u, receive %u\n", stream_index, packet_sequence_number); 457 458 int16_t packet_sequence_delta = btstack_time16_delta(packet_sequence_number, 459 stream_last_packet_sequence[stream_index]); 460 if (packet_sequence_delta < 1) { 461 // drop delayed packet that had already been generated by PLC 462 printf_plc("- dropping delayed packet. Current sequence number %u, last received or generated by PLC: %u\n", 463 packet_sequence_number, stream_last_packet_sequence[stream_index]); 464 return; 465 } 466 // simple check 467 if (packet_sequence_number != stream_last_packet_sequence[stream_index] + 1) { 468 printf_plc("- ISO #%u, missing %u\n", stream_index, stream_last_packet_sequence[stream_index] + 1); 469 } 470 } else { 471 printf_plc("ISO %u, first packet seq number %u\n", stream_index, packet_sequence_number); 472 stream_last_packet_received[stream_index] = true; 473 } 474 475 plc_check(packet_sequence_number); 476 477 // either empty packets or num channels * num octets 478 if ((iso_sdu_length != 0) && (iso_sdu_length != le_audio_demo_sink_num_channels_per_stream * le_audio_demo_sink_octets_per_frame)) { 479 printf("ISO Length %u != %u * %u\n", iso_sdu_length, le_audio_demo_sink_num_channels_per_stream, le_audio_demo_sink_octets_per_frame); 480 log_info("ISO Length %u != %u * %u", iso_sdu_length, le_audio_demo_sink_num_channels_per_stream, le_audio_demo_sink_octets_per_frame); 481 return; 482 } 483 484 const btstack_audio_sink_t * sink = btstack_audio_sink_get_instance(); 485 if( (sink != NULL) && (iso_sdu_length>0)) { 486 if( !sink_receive_streaming && playback_active ) { 487 btstack_sample_rate_compensation_init( &sample_rate_compensation, receive_time_ms, 488 le_audio_demo_sink_sampling_frequency_hz, FLOAT_TO_Q15(1.f) ); 489 sink_receive_streaming = true; 490 } 491 if( sink_receive_streaming ) { 492 uint32_t resampling_factor = btstack_sample_rate_compensation_update( &sample_rate_compensation, receive_time_ms, 493 le_audio_demo_sink_num_samples_per_frame, sink->get_samplerate() ); 494 btstack_resample_set_factor(&resample_instance, resampling_factor); 495 } 496 } 497 498 499 if (iso_sdu_length == 0) { 500 // empty packet -> generate silence 501 memset(pcm, 0, sizeof(pcm)); 502 uint8_t i; 503 for (i = 0 ; i < le_audio_demo_sink_num_channels_per_stream ; i++) { 504 have_pcm[stream_index + i] = true; 505 } 506 } else { 507 // regular packet -> decode codec frame 508 uint8_t i; 509 for (i = 0 ; i < le_audio_demo_sink_num_channels_per_stream ; i++){ 510 uint8_t tmp_BEC_detect; 511 uint8_t BFI = 0; 512 uint8_t effective_channel = stream_index + i; 513 (void) lc3_decoder->decode_signed_16(decoder_contexts[effective_channel], &packet[offset], BFI, 514 &pcm[effective_channel], le_audio_demo_sink_num_channels, 515 &tmp_BEC_detect); 516 offset += le_audio_demo_sink_octets_per_frame; 517 have_pcm[stream_index + i] = true; 518 } 519 } 520 521 store_samples_in_ringbuffer(); 522 523 le_audio_demo_sink_lc3_frames++; 524 525 // PLC 526 btstack_run_loop_remove_timer(&next_packet_timer); 527 btstack_run_loop_set_timer(&next_packet_timer, plc_timeout_initial_ms); 528 btstack_run_loop_set_timer_handler(&next_packet_timer, plc_timeout); 529 btstack_run_loop_add_timer(&next_packet_timer); 530 531 if (samples_received >= le_audio_demo_sink_sampling_frequency_hz){ 532 printf("LC3 Frames: %4u - samples received %5u, played %5u, dropped %5u\n", le_audio_demo_sink_lc3_frames, samples_received, samples_played, samples_dropped); 533 samples_received = 0; 534 samples_dropped = 0; 535 samples_played = 0; 536 } 537 538 stream_last_packet_sequence[stream_index] = packet_sequence_number; 539 } 540 541 /** 542 * @brief Close sink: close wav file, stop playback 543 */ 544 void le_audio_demo_util_sink_close(void){ 545 #ifdef HAVE_POSIX_FILE_IO 546 printf("Close WAV file\n"); 547 wav_writer_close(); 548 #endif 549 // stop playback 550 const btstack_audio_sink_t * sink = btstack_audio_sink_get_instance(); 551 if (sink != NULL){ 552 sink->stop_stream(); 553 } 554 sink_receive_streaming = false; 555 // stop timer 556 btstack_run_loop_remove_timer(&next_packet_timer); 557 } 558