1 /* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. 4 */ 5 6 #include <stdint.h> 7 #include <sys/ioctl.h> 8 #include <sys/param.h> 9 #include <linux/sockios.h> 10 #include <sys/socket.h> 11 #include <syslog.h> 12 #include <time.h> 13 14 #include "audio_thread.h" 15 #include "audio_thread_log.h" 16 #include "byte_buffer.h" 17 #include "cras_iodev_list.h" 18 #include "cras_a2dp_endpoint.h" 19 #include "cras_a2dp_info.h" 20 #include "cras_a2dp_iodev.h" 21 #include "cras_audio_area.h" 22 #include "cras_bt_device.h" 23 #include "cras_iodev.h" 24 #include "cras_util.h" 25 #include "sfh.h" 26 #include "rtp.h" 27 #include "utlist.h" 28 29 #define PCM_BUF_MAX_SIZE_FRAMES (4096*4) 30 #define PCM_BUF_MAX_SIZE_BYTES (PCM_BUF_MAX_SIZE_FRAMES * 4) 31 32 /* Child of cras_iodev to handle bluetooth A2DP streaming. 33 * Members: 34 * base - The cras_iodev structure "base class" 35 * a2dp - The codec and encoded state of a2dp_io. 36 * transport - The transport object for bluez media API. 37 * sock_depth_frames - Socket depth in frames of the a2dp socket. 38 * pcm_buf - Buffer to hold pcm samples before encode. 39 * destroyed - Flag to note if this a2dp_io is about to destroy. 40 * pre_fill_complete - Flag to note if socket pre-fill is completed. 41 * bt_written_frames - Accumulated frames written to a2dp socket. Used 42 * together with the device open timestamp to estimate how many virtual 43 * buffer is queued there. 44 * dev_open_time - The last time a2dp_ios is opened. 45 */ 46 struct a2dp_io { 47 struct cras_iodev base; 48 struct a2dp_info a2dp; 49 struct cras_bt_transport *transport; 50 unsigned sock_depth_frames; 51 struct byte_buffer *pcm_buf; 52 int destroyed; 53 int pre_fill_complete; 54 uint64_t bt_written_frames; 55 struct timespec dev_open_time; 56 }; 57 58 static int flush_data(void *arg); 59 60 static int update_supported_formats(struct cras_iodev *iodev) 61 { 62 struct a2dp_io *a2dpio = (struct a2dp_io *)iodev; 63 size_t rate = 0; 64 size_t channel; 65 a2dp_sbc_t a2dp; 66 67 cras_bt_transport_configuration(a2dpio->transport, &a2dp, 68 sizeof(a2dp)); 69 70 iodev->format->format = SND_PCM_FORMAT_S16_LE; 71 channel = (a2dp.channel_mode == SBC_CHANNEL_MODE_MONO) ? 1 : 2; 72 73 if (a2dp.frequency & SBC_SAMPLING_FREQ_48000) 74 rate = 48000; 75 else if (a2dp.frequency & SBC_SAMPLING_FREQ_44100) 76 rate = 44100; 77 else if (a2dp.frequency & SBC_SAMPLING_FREQ_32000) 78 rate = 32000; 79 else if (a2dp.frequency & SBC_SAMPLING_FREQ_16000) 80 rate = 16000; 81 82 free(iodev->supported_rates); 83 iodev->supported_rates = (size_t *)malloc(2 * sizeof(rate)); 84 iodev->supported_rates[0] = rate; 85 iodev->supported_rates[1] = 0; 86 87 free(iodev->supported_channel_counts); 88 iodev->supported_channel_counts = (size_t *)malloc(2 * sizeof(channel)); 89 iodev->supported_channel_counts[0] = channel; 90 iodev->supported_channel_counts[1] = 0; 91 92 free(iodev->supported_formats); 93 iodev->supported_formats = 94 (snd_pcm_format_t *)malloc(2 * sizeof(snd_pcm_format_t)); 95 iodev->supported_formats[0] = SND_PCM_FORMAT_S16_LE; 96 iodev->supported_formats[1] = 0; 97 98 return 0; 99 } 100 101 /* Calculates the number of virtual buffer in frames. Assuming all written 102 * buffer is consumed in a constant frame rate at bluetooth device side. 103 * Args: 104 * iodev: The a2dp iodev to estimate the queued frames for. 105 * fr: The amount of frames just transmitted. 106 */ 107 static int bt_queued_frames(const struct cras_iodev *iodev, int fr) 108 { 109 uint64_t consumed; 110 struct a2dp_io *a2dpio = (struct a2dp_io *)iodev; 111 112 /* Calculate consumed frames since device has opened */ 113 a2dpio->bt_written_frames += fr; 114 consumed = cras_frames_since_time(&a2dpio->dev_open_time, 115 iodev->format->frame_rate); 116 117 if (a2dpio->bt_written_frames > consumed) 118 return a2dpio->bt_written_frames - consumed; 119 else 120 return 0; 121 } 122 123 124 static int frames_queued(const struct cras_iodev *iodev, 125 struct timespec *tstamp) 126 { 127 struct a2dp_io *a2dpio = (struct a2dp_io *)iodev; 128 int estimate_queued_frames = bt_queued_frames(iodev, 0); 129 int local_queued_frames = 130 a2dp_queued_frames(&a2dpio->a2dp) + 131 buf_queued_bytes(a2dpio->pcm_buf) / 132 cras_get_format_bytes(iodev->format); 133 clock_gettime(CLOCK_MONOTONIC_RAW, tstamp); 134 return MIN(iodev->buffer_size, 135 MAX(estimate_queued_frames, local_queued_frames)); 136 } 137 138 static int open_dev(struct cras_iodev *iodev) 139 { 140 struct a2dp_io *a2dpio = (struct a2dp_io *)iodev; 141 int sock_depth; 142 int err; 143 144 err = cras_bt_transport_acquire(a2dpio->transport); 145 if (err < 0) { 146 syslog(LOG_ERR, "transport_acquire failed"); 147 return err; 148 } 149 150 /* Apply the node's volume after transport is acquired. Doing this 151 * is necessary because the volume can not sync to hardware until 152 * it is opened. */ 153 iodev->set_volume(iodev); 154 155 /* Assert format is set before opening device. */ 156 if (iodev->format == NULL) 157 return -EINVAL; 158 iodev->format->format = SND_PCM_FORMAT_S16_LE; 159 cras_iodev_init_audio_area(iodev, iodev->format->num_channels); 160 161 a2dpio->pcm_buf = byte_buffer_create(PCM_BUF_MAX_SIZE_BYTES); 162 if (!a2dpio->pcm_buf) 163 return -ENOMEM; 164 165 iodev->buffer_size = PCM_BUF_MAX_SIZE_FRAMES; 166 167 /* Set up the socket to hold two MTUs full of data before returning 168 * EAGAIN. This will allow the write to be throttled when a reasonable 169 * amount of data is queued. */ 170 sock_depth = 2 * cras_bt_transport_write_mtu(a2dpio->transport); 171 setsockopt(cras_bt_transport_fd(a2dpio->transport), 172 SOL_SOCKET, SO_SNDBUF, &sock_depth, sizeof(sock_depth)); 173 174 a2dpio->sock_depth_frames = 175 a2dp_block_size(&a2dpio->a2dp, 176 cras_bt_transport_write_mtu(a2dpio->transport)) 177 / cras_get_format_bytes(iodev->format) * 2; 178 iodev->min_buffer_level = a2dpio->sock_depth_frames; 179 180 a2dpio->pre_fill_complete = 0; 181 182 /* Initialize variables for bt_queued_frames() */ 183 a2dpio->bt_written_frames = 0; 184 clock_gettime(CLOCK_MONOTONIC_RAW, &a2dpio->dev_open_time); 185 186 audio_thread_add_write_callback(cras_bt_transport_fd(a2dpio->transport), 187 flush_data, iodev); 188 audio_thread_enable_callback(cras_bt_transport_fd(a2dpio->transport), 189 0); 190 return 0; 191 } 192 193 static int close_dev(struct cras_iodev *iodev) 194 { 195 int err; 196 struct a2dp_io *a2dpio = (struct a2dp_io *)iodev; 197 struct cras_bt_device *device; 198 199 if (!a2dpio->transport) 200 return 0; 201 202 /* Remove audio thread callback and sync before releasing 203 * the transport. */ 204 audio_thread_rm_callback_sync( 205 cras_iodev_list_get_audio_thread(), 206 cras_bt_transport_fd(a2dpio->transport)); 207 208 err = cras_bt_transport_release(a2dpio->transport, 209 !a2dpio->destroyed); 210 if (err < 0) 211 syslog(LOG_ERR, "transport_release failed"); 212 213 device = cras_bt_transport_device(a2dpio->transport); 214 if (device) 215 cras_bt_device_cancel_suspend(device); 216 a2dp_drain(&a2dpio->a2dp); 217 byte_buffer_destroy(a2dpio->pcm_buf); 218 cras_iodev_free_format(iodev); 219 cras_iodev_free_audio_area(iodev); 220 return 0; 221 } 222 223 static int pre_fill_socket(struct a2dp_io *a2dpio) 224 { 225 static const uint16_t zero_buffer[1024 * 2]; 226 int processed; 227 int written = 0; 228 229 while (1) { 230 processed = a2dp_encode( 231 &a2dpio->a2dp, 232 zero_buffer, 233 sizeof(zero_buffer), 234 cras_get_format_bytes(a2dpio->base.format), 235 cras_bt_transport_write_mtu(a2dpio->transport)); 236 if (processed < 0) 237 return processed; 238 if (processed == 0) 239 break; 240 241 written = a2dp_write( 242 &a2dpio->a2dp, 243 cras_bt_transport_fd(a2dpio->transport), 244 cras_bt_transport_write_mtu(a2dpio->transport)); 245 /* Full when EAGAIN is returned. */ 246 if (written == -EAGAIN) 247 break; 248 else if (written < 0) 249 return written; 250 else if (written == 0) 251 break; 252 }; 253 254 a2dp_drain(&a2dpio->a2dp); 255 return 0; 256 } 257 258 /* Flushes queued buffer, including pcm and a2dp buffer. 259 * Returns: 260 * 0 when the flush succeeded, -1 when error occurred. 261 */ 262 static int flush_data(void *arg) 263 { 264 struct cras_iodev *iodev = (struct cras_iodev *)arg; 265 int processed; 266 size_t format_bytes; 267 int written = 0; 268 int queued_frames; 269 struct a2dp_io *a2dpio; 270 struct cras_bt_device *device; 271 272 a2dpio = (struct a2dp_io *)iodev; 273 format_bytes = cras_get_format_bytes(iodev->format); 274 device = cras_bt_transport_device(a2dpio->transport); 275 276 /* If bt device has been destroyed, this a2dp iodev will soon be 277 * destroyed as well. */ 278 if (device == NULL) 279 return -EINVAL; 280 281 encode_more: 282 while (buf_queued_bytes(a2dpio->pcm_buf)) { 283 processed = a2dp_encode( 284 &a2dpio->a2dp, 285 buf_read_pointer(a2dpio->pcm_buf), 286 buf_readable_bytes(a2dpio->pcm_buf), 287 format_bytes, 288 cras_bt_transport_write_mtu(a2dpio->transport)); 289 ATLOG(atlog, AUDIO_THREAD_A2DP_ENCODE, 290 processed, 291 buf_queued_bytes(a2dpio->pcm_buf), 292 buf_readable_bytes(a2dpio->pcm_buf) 293 ); 294 if (processed == -ENOSPC || processed == 0) 295 break; 296 if (processed < 0) 297 return 0; 298 299 buf_increment_read(a2dpio->pcm_buf, processed); 300 } 301 302 written = a2dp_write(&a2dpio->a2dp, 303 cras_bt_transport_fd(a2dpio->transport), 304 cras_bt_transport_write_mtu(a2dpio->transport)); 305 ATLOG(atlog, AUDIO_THREAD_A2DP_WRITE, 306 written, 307 a2dp_queued_frames(&a2dpio->a2dp), 0); 308 if (written == -EAGAIN) { 309 /* If EAGAIN error lasts longer than 5 seconds, suspend the 310 * a2dp connection. */ 311 cras_bt_device_schedule_suspend(device, 5000); 312 audio_thread_enable_callback( 313 cras_bt_transport_fd(a2dpio->transport), 1); 314 return 0; 315 } else if (written < 0) { 316 /* Suspend a2dp immediately when receives error other than 317 * EAGAIN. */ 318 cras_bt_device_cancel_suspend(device); 319 cras_bt_device_schedule_suspend(device, 0); 320 return written; 321 } 322 323 /* Data succcessfully written to a2dp socket, cancel any scheduled 324 * suspend timer. */ 325 cras_bt_device_cancel_suspend(device); 326 327 /* If it looks okay to write more and we do have queued data, try 328 * encode more. But avoid the case when PCM buffer level is too close 329 * to min_buffer_level so that another A2DP write could causes underrun. 330 */ 331 queued_frames = buf_queued_bytes(a2dpio->pcm_buf) / format_bytes; 332 if (written && (iodev->min_buffer_level + written < queued_frames)) 333 goto encode_more; 334 335 /* everything written. */ 336 audio_thread_enable_callback( 337 cras_bt_transport_fd(a2dpio->transport), 0); 338 339 return 0; 340 } 341 342 static int delay_frames(const struct cras_iodev *iodev) 343 { 344 const struct a2dp_io *a2dpio = (struct a2dp_io *)iodev; 345 struct timespec tstamp; 346 347 /* The number of frames in the pcm buffer plus two mtu packets */ 348 return frames_queued(iodev, &tstamp) + a2dpio->sock_depth_frames; 349 } 350 351 static int get_buffer(struct cras_iodev *iodev, 352 struct cras_audio_area **area, 353 unsigned *frames) 354 { 355 size_t format_bytes; 356 struct a2dp_io *a2dpio; 357 358 a2dpio = (struct a2dp_io *)iodev; 359 360 format_bytes = cras_get_format_bytes(iodev->format); 361 362 if (iodev->direction != CRAS_STREAM_OUTPUT) 363 return 0; 364 365 *frames = MIN(*frames, buf_writable_bytes(a2dpio->pcm_buf) / 366 format_bytes); 367 iodev->area->frames = *frames; 368 cras_audio_area_config_buf_pointers( 369 iodev->area, iodev->format, 370 buf_write_pointer(a2dpio->pcm_buf)); 371 *area = iodev->area; 372 return 0; 373 } 374 375 static int put_buffer(struct cras_iodev *iodev, unsigned nwritten) 376 { 377 size_t written_bytes; 378 size_t format_bytes; 379 struct a2dp_io *a2dpio = (struct a2dp_io *)iodev; 380 381 format_bytes = cras_get_format_bytes(iodev->format); 382 written_bytes = nwritten * format_bytes; 383 384 if (written_bytes > buf_writable_bytes(a2dpio->pcm_buf)) 385 return -EINVAL; 386 387 buf_increment_write(a2dpio->pcm_buf, written_bytes); 388 389 bt_queued_frames(iodev, nwritten); 390 391 /* Until the minimum number of frames have been queued, don't send 392 * anything. */ 393 if (!a2dpio->pre_fill_complete) { 394 pre_fill_socket(a2dpio); 395 a2dpio->pre_fill_complete = 1; 396 /* Start measuring frames_consumed from now. */ 397 clock_gettime(CLOCK_MONOTONIC_RAW, &a2dpio->dev_open_time); 398 } 399 400 return flush_data(iodev); 401 } 402 403 static int flush_buffer(struct cras_iodev *iodev) 404 { 405 return 0; 406 } 407 408 static void set_volume(struct cras_iodev *iodev) 409 { 410 size_t volume; 411 struct a2dp_io *a2dpio = (struct a2dp_io *)iodev; 412 struct cras_bt_device *device = 413 cras_bt_transport_device(a2dpio->transport); 414 415 if (!cras_bt_device_get_use_hardware_volume(device)) 416 return; 417 418 volume = iodev->active_node->volume * 127 / 100; 419 420 if (a2dpio->transport) 421 cras_bt_transport_set_volume(a2dpio->transport, volume); 422 } 423 424 static void update_active_node(struct cras_iodev *iodev, unsigned node_idx, 425 unsigned dev_enabled) 426 { 427 } 428 429 void free_resources(struct a2dp_io *a2dpio) 430 { 431 struct cras_ionode *node; 432 433 node = a2dpio->base.active_node; 434 if (node) { 435 cras_iodev_rm_node(&a2dpio->base, node); 436 free(node); 437 } 438 free(a2dpio->base.supported_channel_counts); 439 free(a2dpio->base.supported_rates); 440 destroy_a2dp(&a2dpio->a2dp); 441 } 442 443 struct cras_iodev *a2dp_iodev_create(struct cras_bt_transport *transport) 444 { 445 int err; 446 struct a2dp_io *a2dpio; 447 struct cras_iodev *iodev; 448 struct cras_ionode *node; 449 a2dp_sbc_t a2dp; 450 struct cras_bt_device *device; 451 const char *name; 452 453 a2dpio = (struct a2dp_io *)calloc(1, sizeof(*a2dpio)); 454 if (!a2dpio) 455 goto error; 456 457 a2dpio->transport = transport; 458 cras_bt_transport_configuration(a2dpio->transport, &a2dp, 459 sizeof(a2dp)); 460 err = init_a2dp(&a2dpio->a2dp, &a2dp); 461 if (err) { 462 syslog(LOG_ERR, "Fail to init a2dp"); 463 goto error; 464 } 465 466 iodev = &a2dpio->base; 467 468 /* A2DP only does output now */ 469 iodev->direction = CRAS_STREAM_OUTPUT; 470 471 /* Set iodev's name by bluetooth device's readable name, if 472 * the readable name is not available, use address instead. 473 */ 474 device = cras_bt_transport_device(transport); 475 name = cras_bt_device_name(device); 476 if (!name) 477 name = cras_bt_transport_object_path(a2dpio->transport); 478 479 snprintf(iodev->info.name, sizeof(iodev->info.name), "%s", name); 480 iodev->info.name[ARRAY_SIZE(iodev->info.name) - 1] = '\0'; 481 iodev->info.stable_id = SuperFastHash( 482 cras_bt_device_object_path(device), 483 strlen(cras_bt_device_object_path(device)), 484 strlen(cras_bt_device_object_path(device))); 485 iodev->info.stable_id_new = iodev->info.stable_id; 486 487 iodev->open_dev = open_dev; 488 iodev->frames_queued = frames_queued; 489 iodev->delay_frames = delay_frames; 490 iodev->get_buffer = get_buffer; 491 iodev->put_buffer = put_buffer; 492 iodev->flush_buffer = flush_buffer; 493 iodev->close_dev = close_dev; 494 iodev->update_supported_formats = update_supported_formats; 495 iodev->update_active_node = update_active_node; 496 iodev->set_volume = set_volume; 497 498 /* Create a dummy ionode */ 499 node = (struct cras_ionode *)calloc(1, sizeof(*node)); 500 node->dev = iodev; 501 strcpy(node->name, iodev->info.name); 502 node->plugged = 1; 503 node->type = CRAS_NODE_TYPE_BLUETOOTH; 504 node->volume = 100; 505 gettimeofday(&node->plugged_time, NULL); 506 507 /* A2DP does output only */ 508 cras_bt_device_append_iodev(device, iodev, 509 cras_bt_transport_profile(a2dpio->transport)); 510 cras_iodev_add_node(iodev, node); 511 cras_iodev_set_active_node(iodev, node); 512 513 return iodev; 514 error: 515 if (a2dpio) { 516 free_resources(a2dpio); 517 free(a2dpio); 518 } 519 return NULL; 520 } 521 522 void a2dp_iodev_destroy(struct cras_iodev *iodev) 523 { 524 struct a2dp_io *a2dpio = (struct a2dp_io *)iodev; 525 struct cras_bt_device *device; 526 527 a2dpio->destroyed = 1; 528 device = cras_bt_transport_device(a2dpio->transport); 529 530 /* A2DP does output only */ 531 cras_bt_device_rm_iodev(device, iodev); 532 533 /* Free resources when device successfully removed. */ 534 free_resources(a2dpio); 535 cras_iodev_free_resources(iodev); 536 free(a2dpio); 537 } 538
