Mikhail Naganov | c337a87 | 2023-07-07 12:01:17 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2023 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <limits> |
| 18 | |
| 19 | #define LOG_TAG "AHAL_StreamAlsa" |
| 20 | #include <android-base/logging.h> |
| 21 | |
| 22 | #include <Utils.h> |
| 23 | #include <error/expected_utils.h> |
| 24 | |
| 25 | #include "core-impl/StreamAlsa.h" |
| 26 | |
| 27 | namespace aidl::android::hardware::audio::core { |
| 28 | |
| 29 | StreamAlsa::StreamAlsa(const Metadata& metadata, StreamContext&& context) |
| 30 | : StreamCommonImpl(metadata, std::move(context)), |
| 31 | mFrameSizeBytes(getContext().getFrameSize()), |
| 32 | mIsInput(isInput(metadata)), |
| 33 | mConfig(alsa::getPcmConfig(getContext(), mIsInput)) {} |
| 34 | |
| 35 | ::android::status_t StreamAlsa::init() { |
| 36 | return mConfig.has_value() ? ::android::OK : ::android::NO_INIT; |
| 37 | } |
| 38 | |
| 39 | ::android::status_t StreamAlsa::standby() { |
| 40 | mAlsaDeviceProxies.clear(); |
| 41 | return ::android::OK; |
| 42 | } |
| 43 | |
| 44 | ::android::status_t StreamAlsa::start() { |
| 45 | decltype(mAlsaDeviceProxies) alsaDeviceProxies; |
| 46 | for (const auto& device : getDeviceProfiles()) { |
| 47 | auto profile = alsa::readAlsaDeviceInfo(device); |
| 48 | if (!profile.has_value()) { |
| 49 | LOG(ERROR) << __func__ << ": unable to read device info, device address=" << device; |
| 50 | return ::android::UNKNOWN_ERROR; |
| 51 | } |
| 52 | |
| 53 | auto proxy = alsa::makeDeviceProxy(); |
| 54 | // Always ask for alsa configure as required since the configuration should be supported |
| 55 | // by the connected device. That is guaranteed by `setAudioPortConfig` and `setAudioPatch`. |
| 56 | if (int err = proxy_prepare(proxy.get(), &profile.value(), |
| 57 | const_cast<struct pcm_config*>(&mConfig.value()), |
| 58 | true /*require_exact_match*/); |
| 59 | err != 0) { |
| 60 | LOG(ERROR) << __func__ << ": fail to prepare for device address=" << device |
| 61 | << " error=" << err; |
| 62 | return ::android::UNKNOWN_ERROR; |
| 63 | } |
| 64 | if (int err = proxy_open(proxy.get()); err != 0) { |
| 65 | LOG(ERROR) << __func__ << ": failed to open device, address=" << device |
| 66 | << " error=" << err; |
| 67 | return ::android::UNKNOWN_ERROR; |
| 68 | } |
| 69 | alsaDeviceProxies.push_back(std::move(proxy)); |
| 70 | } |
| 71 | mAlsaDeviceProxies = std::move(alsaDeviceProxies); |
| 72 | return ::android::OK; |
| 73 | } |
| 74 | |
| 75 | ::android::status_t StreamAlsa::transfer(void* buffer, size_t frameCount, size_t* actualFrameCount, |
| 76 | int32_t* latencyMs) { |
| 77 | const size_t bytesToTransfer = frameCount * mFrameSizeBytes; |
| 78 | unsigned maxLatency = 0; |
| 79 | if (mIsInput) { |
| 80 | if (mAlsaDeviceProxies.empty()) { |
| 81 | LOG(FATAL) << __func__ << ": no input devices"; |
| 82 | return ::android::NO_INIT; |
| 83 | } |
| 84 | // For input case, only support single device. |
| 85 | proxy_read(mAlsaDeviceProxies[0].get(), buffer, bytesToTransfer); |
| 86 | maxLatency = proxy_get_latency(mAlsaDeviceProxies[0].get()); |
| 87 | } else { |
| 88 | for (auto& proxy : mAlsaDeviceProxies) { |
| 89 | proxy_write(proxy.get(), buffer, bytesToTransfer); |
| 90 | maxLatency = std::max(maxLatency, proxy_get_latency(proxy.get())); |
| 91 | } |
| 92 | } |
| 93 | *actualFrameCount = frameCount; |
| 94 | maxLatency = std::min(maxLatency, static_cast<unsigned>(std::numeric_limits<int32_t>::max())); |
| 95 | *latencyMs = maxLatency; |
| 96 | return ::android::OK; |
| 97 | } |
| 98 | |
| 99 | void StreamAlsa::shutdown() { |
| 100 | mAlsaDeviceProxies.clear(); |
| 101 | } |
| 102 | |
| 103 | } // namespace aidl::android::hardware::audio::core |