1 /* 2 ** 3 ** Copyright 2014, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #define LOG_TAG "AudioHAL:alsa_utils" 19 20 #include "alsa_utils.h" 21 22 #ifndef ALSA_UTILS_PRINT_FORMATS 23 #define ALSA_UTILS_PRINT_FORMATS 1 24 #endif 25 26 int find_alsa_card_by_name(const char* name) { 27 int card_id = 0; 28 int ret = -1; 29 int fd; 30 31 do { 32 int fd; 33 int amt; 34 char tmp[256]; 35 36 snprintf(tmp, sizeof(tmp), "/proc/asound/card%d/id", card_id); 37 tmp[sizeof(tmp) - 1] = 0; 38 fd = open(tmp, O_RDONLY); 39 if (fd < 0) 40 break; 41 42 amt = read(fd, tmp, sizeof(tmp) - 1); 43 if (amt > 0) { 44 // replace the '\n' at the end of the proc file with '\0' 45 tmp[amt - 1] = 0; 46 if (!strcmp(name, tmp)) 47 ret = card_id; 48 } 49 50 close(fd); 51 52 card_id++; 53 } while (ret < 0); 54 55 ALOGI("%s: returning card %d for name %s", __func__, ret, name); 56 return ret; 57 } 58 59 #ifdef __cplusplus 60 #include <tinyalsa/asoundlib.h> 61 #include <utils/misc.h> 62 63 namespace android { 64 65 static const char *kCtrlNames[] = { 66 "Basic Audio Supported", 67 "Speaker Allocation", 68 "Audio Mode Count", 69 "Audio Mode To Query", 70 "Query Mode : Format", 71 "Query Mode : Max Ch Count", 72 "Query Mode : Sample Rate Mask", 73 "Query Mode : PCM Bits/Sample Mask", 74 "Query Mode : Max Compressed Bitrate" 75 }; 76 static const size_t kCtrlCount = sizeof(kCtrlNames)/sizeof(*kCtrlNames); 77 static const size_t kBasicAudNdx = 0; 78 static const size_t kSpeakerAlloc = 1; 79 static const size_t kModeCntNdx = 2; 80 static const size_t kModeSelNdx = 3; 81 static const size_t kFmtNdx = 4; 82 static const size_t kMaxChCntNdx = 5; 83 static const size_t kSampRateNdx = 6; 84 static const size_t kBPSNdx = 7; 85 static const size_t kMaxCompBRNdx = 8; 86 87 HDMIAudioCaps::HDMIAudioCaps() 88 { 89 // Its unlikely we will need storage for more than 16 modes, but if we do, 90 // the vector will resize for us. 91 mModes.setCapacity(16); 92 reset(); 93 } 94 95 bool HDMIAudioCaps::loadCaps(int ALSADeviceID) { 96 bool ret = false; 97 struct mixer* mixer = NULL; 98 struct mixer_ctl* ctrls[kCtrlCount] = {NULL}; 99 int tmp, mode_cnt; 100 Mutex::Autolock _l(mLock); 101 102 ALOGE("%s: start", __func__); 103 104 reset_l(); 105 106 // Open the mixer for the chosen ALSA device 107 if (NULL == (mixer = mixer_open(ALSADeviceID))) { 108 ALOGE("%s: mixer_open(%d) failed", __func__, ALSADeviceID); 109 goto bailout; 110 } 111 112 // Gather handles to all of the controls we will need in order to enumerate 113 // the audio capabilities of this HDMI link. No need to free/release these 114 // later, they are just pointers into the tinyalsa mixer structure itself. 115 for (size_t i = 0; i < kCtrlCount; ++i) { 116 ctrls[i] = mixer_get_ctl_by_name(mixer, kCtrlNames[i]); 117 if (NULL == ctrls[i]) { 118 ALOGE("%s: mixer_get_ctrl_by_name(%s) failed", __func__, kCtrlNames[i]); 119 goto bailout; 120 } 121 } 122 123 // Start by checking to see if this HDMI connection supports even basic 124 // audio. If it does not, there is no point in proceeding. 125 if ((tmp = mixer_ctl_get_value(ctrls[kBasicAudNdx], 0)) <= 0) { 126 ALOGI("%s: Basic audio not supported by attached device", __func__); 127 goto bailout; 128 } 129 130 // Looks like we support basic audio. Get a count of the available 131 // non-basic modes. 132 mBasicAudioSupported = true; 133 if ((mode_cnt = mixer_ctl_get_value(ctrls[kModeCntNdx], 0)) < 0) 134 goto bailout; 135 136 // Fetch the speaker allocation data block, if available. 137 if ((tmp = mixer_ctl_get_value(ctrls[kSpeakerAlloc], 0)) < 0) 138 goto bailout; 139 mSpeakerAlloc = static_cast<uint16_t>(tmp); 140 ALOGI("%s: Speaker Allocation Map for attached device is: 0x%hx", __func__, mSpeakerAlloc); 141 142 // If there are no non-basic modes available, then we are done. Be sure to 143 // flag this as a successful operation. 144 if (!mode_cnt) { 145 ret = true; 146 goto bailout; 147 } 148 149 // Now enumerate the non-basic modes. Any errors at this point in time 150 // should indicate that the HDMI cable was unplugged and we should just 151 // abort with an empty set of audio capabilities. 152 for (int i = 0; i < mode_cnt; ++i) { 153 Mode m; 154 155 // Pick the mode we want to fetch info for. 156 if (mixer_ctl_set_value(ctrls[kModeSelNdx], 0, i) < 0) 157 goto bailout; 158 159 // Now fetch the common fields. 160 if ((tmp = mixer_ctl_get_value(ctrls[kFmtNdx], 0)) < 0) 161 goto bailout; 162 m.fmt = static_cast<AudFormat>(tmp); 163 ALOGI("Got mode %d from ALSA driver.", m.fmt); 164 165 if ((tmp = mixer_ctl_get_value(ctrls[kMaxChCntNdx], 0)) < 0) 166 goto bailout; 167 m.max_ch = static_cast<uint32_t>(tmp); 168 169 if ((tmp = mixer_ctl_get_value(ctrls[kSampRateNdx], 0)) < 0) 170 goto bailout; 171 m.sr_bitmask = static_cast<uint32_t>(tmp); 172 173 // Now for the mode dependent fields. Only LPCM has the bits-per-sample 174 // mask. Only AC3 through ATRAC have the compressed bitrate field. 175 m.bps_bitmask = 0; 176 m.comp_bitrate = 0; 177 178 if (m.fmt == kFmtLPCM) { 179 if ((tmp = mixer_ctl_get_value(ctrls[kBPSNdx], 0)) < 0) 180 goto bailout; 181 m.bps_bitmask = static_cast<uint32_t>(tmp); 182 } else if ((m.fmt >= kFmtAC3) && (m.fmt <= kFmtATRAC)) { // FIXME ATRAC is not last format!? 183 if ((tmp = mixer_ctl_get_value(ctrls[kMaxCompBRNdx], 0)) < 0) 184 goto bailout; 185 m.comp_bitrate = static_cast<uint32_t>(tmp); 186 } 187 188 // Finally, sanity check the info. If it passes, add it to the vector 189 // of available modes. 190 if (sanityCheckMode(m)) { 191 ALOGI("Passed sanity check for mode %d from ALSA driver.", m.fmt); 192 mModes.add(m); 193 } 194 } 195 196 // Looks like we managed to enumerate all of the modes before someone 197 // unplugged the HDMI cable. Signal success and get out. 198 ret = true; 199 200 bailout: 201 if (NULL != mixer) 202 mixer_close(mixer); 203 204 if (!ret) 205 reset_l(); 206 207 return ret; 208 } 209 210 void HDMIAudioCaps::reset() { 211 Mutex::Autolock _l(mLock); 212 reset_l(); 213 } 214 215 void HDMIAudioCaps::reset_l() { 216 mBasicAudioSupported = false; 217 mSpeakerAlloc = 0; 218 mModes.clear(); 219 } 220 221 void HDMIAudioCaps::getRatesForAF(String8& rates) { 222 Mutex::Autolock _l(mLock); 223 rates.clear(); 224 225 // If the sink does not support basic audio, then it supports no audio. 226 if (!mBasicAudioSupported) 227 return; 228 229 // Basic audio always supports from 32k through 38k. 230 uint32_t tmp = kSR_32000 | kSR_44100 | kSR_48000; 231 232 // To keep things simple, only report mode information for the PCM mode 233 // which supports the maximum number of channels. 234 ssize_t ndx = getMaxChModeNdx_l(); 235 if (ndx >= 0) 236 tmp |= mModes[ndx].sr_bitmask; 237 238 bool first = true; 239 for (uint32_t i = 1; tmp; i <<= 1) { 240 if (i & tmp) { 241 rates.appendFormat(first ? "%d" : "|%d", srMaskToSR(i)); 242 first = false; 243 tmp &= ~i; 244 } 245 } 246 } 247 248 void HDMIAudioCaps::getFmtsForAF(String8& fmts) { 249 Mutex::Autolock _l(mLock); 250 fmts.clear(); 251 252 // If the sink does not support basic audio, then it supports no audio. 253 if (!mBasicAudioSupported) { 254 ALOGI("ALSAFORMATS: basic audio not supported"); 255 return; 256 } 257 258 fmts.append("AUDIO_FORMAT_PCM_16_BIT"); 259 // TODO: when we can start to expect 20 and 24 bit audio modes coming from 260 // AF, we need to implement support to enumerate those modes. 261 262 // These names must match formats in android.media.AudioFormat 263 for (size_t i = 0; i < mModes.size(); ++i) { 264 switch (mModes[i].fmt) { 265 case kFmtAC3: 266 fmts.append("|AUDIO_FORMAT_AC3"); 267 break; 268 case kFmtEAC3: 269 fmts.append("|AUDIO_FORMAT_E_AC3"); 270 break; 271 default: 272 break; 273 } 274 } 275 276 #if ALSA_UTILS_PRINT_FORMATS 277 ALOGI("ALSAFORMATS: formats = %s", fmts.string()); 278 279 for (size_t i = 0; i < mModes.size(); ++i) { 280 ALOGI("ALSAFORMATS: ------- fmt[%d] = 0x%08X = %s", 281 i, mModes[i].fmt, fmtToString(mModes[i].fmt)); 282 ALOGI("ALSAFORMATS: comp_bitrate[%d] = 0x%08X = %d", 283 i, mModes[i].comp_bitrate, mModes[i].comp_bitrate); 284 ALOGI("ALSAFORMATS: max_ch[%d] = 0x%08X = %d", 285 i, mModes[i].max_ch, mModes[i].max_ch); 286 ALOGI("ALSAFORMATS: bps_bitmask[%d] = 0x%08X", i, mModes[i].bps_bitmask); 287 uint32_t bpsm = mModes[i].bps_bitmask; 288 while(bpsm) { 289 uint32_t bpsm_next = bpsm & (bpsm - 1); 290 uint32_t bpsm_single = bpsm ^ bpsm_next; 291 if (bpsm_single) { 292 ALOGI("ALSAFORMATS: bits = %d", bpsMaskToBPS(bpsm_single)); 293 } 294 bpsm = bpsm_next; 295 } 296 ALOGI("ALSAFORMATS: sr_bitmask[%d] = 0x%08X", i, mModes[i].sr_bitmask); 297 uint32_t srs = mModes[i].sr_bitmask; 298 while(srs) { 299 uint32_t srs_next = srs & (srs - 1); 300 uint32_t srs_single = srs ^ srs_next; 301 if (srs_single) { 302 ALOGI("ALSAFORMATS: srate = %d", srMaskToSR(srs_single)); 303 } 304 srs = srs_next; 305 } 306 } 307 #endif /* ALSA_UTILS_PRINT_FORMATS */ 308 } 309 310 void HDMIAudioCaps::getChannelMasksForAF(String8& masks, bool skipStereo) { 311 Mutex::Autolock _l(mLock); 312 masks.clear(); 313 314 // If the sink does not support basic audio, then it supports no audio. 315 if (!mBasicAudioSupported) 316 return; 317 318 // Don't list stereo modes if the caller requests it. This is mostly to 319 // support the hack which ends up routing multichannel audio to the special 320 // multichannel audio stream out, but not native stereo tracks. 321 if (!skipStereo) 322 masks.append("AUDIO_CHANNEL_OUT_STEREO"); 323 324 // To keep things simple, only report mode information for the PCM mode 325 // which supports the maximum number of channels. 326 ssize_t ndx = getMaxChModeNdx_l(); 327 if (ndx < 0) 328 return; 329 330 if (mModes[ndx].max_ch >= 6) { 331 if (masks.length()) 332 masks.append("|"); 333 334 masks.append((mModes[ndx].max_ch >= 8) 335 ? "AUDIO_CHANNEL_OUT_5POINT1|AUDIO_CHANNEL_OUT_7POINT1" 336 : "AUDIO_CHANNEL_OUT_5POINT1"); 337 } 338 } 339 340 ssize_t HDMIAudioCaps::getMaxChModeNdx_l() { 341 ssize_t max_ch_ndx = -1; 342 uint32_t max_ch = 0; 343 344 for (size_t i = 0; i < mModes.size(); ++i) { 345 if ((mModes[i].fmt == kFmtLPCM) && (max_ch < mModes[i].max_ch)) { 346 max_ch < mModes[i].max_ch; 347 max_ch_ndx = i; 348 } 349 } 350 351 return max_ch_ndx; 352 } 353 354 bool HDMIAudioCaps::supportsFormat(audio_format_t format, 355 uint32_t sampleRate, 356 uint32_t channelCount) { 357 Mutex::Autolock _l(mLock); 358 359 // If the sink does not support basic audio, then it supports no audio. 360 if (!mBasicAudioSupported) 361 return false; 362 363 AudFormat alsaFormat; 364 switch (format & AUDIO_FORMAT_MAIN_MASK) { 365 case AUDIO_FORMAT_PCM: alsaFormat = kFmtLPCM; break; 366 case AUDIO_FORMAT_AC3: alsaFormat = kFmtAC3; break; 367 case AUDIO_FORMAT_E_AC3: alsaFormat = kFmtAC3; break; 368 default: return false; 369 } 370 371 SRMask srMask; 372 switch (sampleRate) { 373 case 32000: srMask = kSR_32000; break; 374 case 44100: srMask = kSR_44100; break; 375 case 48000: srMask = kSR_48000; break; 376 case 88200: srMask = kSR_88200; break; 377 case 96000: srMask = kSR_96000; break; 378 case 176400: srMask = kSR_176400; break; 379 case 192000: srMask = kSR_192000; break; 380 default: return false; 381 } 382 383 // if PCM then determine actual bits per sample. 384 if (alsaFormat == kFmtLPCM) { 385 uint32_t subFormat = format & AUDIO_FORMAT_SUB_MASK; 386 BPSMask bpsMask; 387 switch (subFormat) { 388 case AUDIO_FORMAT_PCM_SUB_16_BIT: bpsMask = kBPS_16bit; break; 389 default: return false; 390 } 391 392 // Is the caller requesting basic audio? If so, we should be good to go. 393 // Otherwise, we need to check the mode table. 394 if ((2 == channelCount) && (sampleRate <= 48000)) 395 return true; 396 397 // Check the modes in the table to see if there is one which 398 // supports the caller's format. 399 for (size_t i = 0; i < mModes.size(); ++i) { 400 const Mode& m = mModes[i]; 401 if ((m.fmt == kFmtLPCM) && 402 (m.max_ch >= channelCount) && 403 (m.sr_bitmask & srMask) && 404 (m.bps_bitmask & bpsMask)) 405 return true; 406 } 407 } else { 408 // Check the modes in the table to see if there is one which 409 // supports the caller's format. 410 for (size_t i = 0; i < mModes.size(); ++i) { 411 const Mode& m = mModes[i]; 412 // ignore bps_bitmask 413 if ((m.fmt == alsaFormat) && 414 (m.max_ch >= channelCount) && 415 (m.sr_bitmask & srMask)) 416 return true; 417 } 418 } 419 420 // Looks like no compatible modes were found. 421 return false; 422 } 423 424 bool HDMIAudioCaps::sanityCheckMode(const Mode& m) { 425 if ((m.fmt < kFmtLPCM) || (m.fmt > kFmtMPGSUR)) 426 return false; 427 428 if (m.max_ch > 8) 429 return false; 430 431 if (m.sr_bitmask & ~(kSR_32000 | kSR_44100 | kSR_48000 | kSR_88200 | 432 kSR_96000 | kSR_176400 | kSR_192000)) 433 return false; 434 435 if (m.bps_bitmask & ~(kBPS_16bit | kBPS_20bit | kBPS_24bit)) 436 return false; 437 438 return true; 439 } 440 441 const char* HDMIAudioCaps::fmtToString(AudFormat fmt) { 442 static const char* fmts[] = { 443 "invalid", "LPCM", "AC-3", "MPEG-1", "MPEG-1 Layer 3", 444 "MPEG-2", "AAC-LC", "DTS", "ATRAC", "DSD", "E-AC3", 445 "DTS-HD", "MLP", "DST", "WMA Pro", "Extended" }; 446 447 if (fmt >= NELEM(fmts)) 448 return "invalid"; 449 450 return fmts[fmt]; 451 } 452 453 uint32_t HDMIAudioCaps::srMaskToSR(uint32_t mask) { 454 switch (mask) { 455 case kSR_32000: return 32000; 456 case kSR_44100: return 44100; 457 case kSR_48000: return 48000; 458 case kSR_88200: return 88200; 459 case kSR_96000: return 96000; 460 case kSR_176400: return 176400; 461 case kSR_192000: return 192000; 462 default: return 0; 463 } 464 } 465 466 uint32_t HDMIAudioCaps::bpsMaskToBPS(uint32_t mask) { 467 switch (mask) { 468 case kBPS_16bit: return 16; 469 case kBPS_20bit: return 20; 470 case kBPS_24bit: return 24; 471 default: return 0; 472 } 473 } 474 475 const char* HDMIAudioCaps::saMaskToString(uint32_t mask) { 476 switch (mask) { 477 case kSA_FLFR: return "Front Left/Right"; 478 case kSA_LFE: return "LFE"; 479 case kSA_FC: return "Front Center"; 480 case kSA_RLRR: return "Rear Left/Right"; 481 case kSA_RC: return "Rear Center"; 482 case kSA_FLCFRC: return "Front Left/Right Center"; 483 case kSA_RLCRRC: return "Rear Left/Right Center"; 484 case kSA_FLWFRW: return "Front Left/Right Wide"; 485 case kSA_FLHFRH: return "Front Left/Right High"; 486 case kSA_TC: return "Top Center (overhead)"; 487 case kSA_FCH: return "Front Center High"; 488 default: return "unknown"; 489 } 490 } 491 492 } // namespace android 493 #endif // __cplusplus 494
