xref: /aosp_15_r20/hardware/interfaces/audio/aidl/default/alsa/StreamAlsa.cpp (revision 4d7e907c777eeecc4c5bd7cf640a754fac206ff7)
1*4d7e907cSAndroid Build Coastguard Worker /*
2*4d7e907cSAndroid Build Coastguard Worker  * Copyright (C) 2023 The Android Open Source Project
3*4d7e907cSAndroid Build Coastguard Worker  *
4*4d7e907cSAndroid Build Coastguard Worker  * Licensed under the Apache License, Version 2.0 (the "License");
5*4d7e907cSAndroid Build Coastguard Worker  * you may not use this file except in compliance with the License.
6*4d7e907cSAndroid Build Coastguard Worker  * You may obtain a copy of the License at
7*4d7e907cSAndroid Build Coastguard Worker  *
8*4d7e907cSAndroid Build Coastguard Worker  *      http://www.apache.org/licenses/LICENSE-2.0
9*4d7e907cSAndroid Build Coastguard Worker  *
10*4d7e907cSAndroid Build Coastguard Worker  * Unless required by applicable law or agreed to in writing, software
11*4d7e907cSAndroid Build Coastguard Worker  * distributed under the License is distributed on an "AS IS" BASIS,
12*4d7e907cSAndroid Build Coastguard Worker  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13*4d7e907cSAndroid Build Coastguard Worker  * See the License for the specific language governing permissions and
14*4d7e907cSAndroid Build Coastguard Worker  * limitations under the License.
15*4d7e907cSAndroid Build Coastguard Worker  */
16*4d7e907cSAndroid Build Coastguard Worker 
17*4d7e907cSAndroid Build Coastguard Worker #include <cmath>
18*4d7e907cSAndroid Build Coastguard Worker #include <limits>
19*4d7e907cSAndroid Build Coastguard Worker 
20*4d7e907cSAndroid Build Coastguard Worker #define LOG_TAG "AHAL_StreamAlsa"
21*4d7e907cSAndroid Build Coastguard Worker #include <android-base/logging.h>
22*4d7e907cSAndroid Build Coastguard Worker 
23*4d7e907cSAndroid Build Coastguard Worker #include <Utils.h>
24*4d7e907cSAndroid Build Coastguard Worker #include <audio_utils/clock.h>
25*4d7e907cSAndroid Build Coastguard Worker #include <error/expected_utils.h>
26*4d7e907cSAndroid Build Coastguard Worker 
27*4d7e907cSAndroid Build Coastguard Worker #include "core-impl/StreamAlsa.h"
28*4d7e907cSAndroid Build Coastguard Worker 
29*4d7e907cSAndroid Build Coastguard Worker namespace aidl::android::hardware::audio::core {
30*4d7e907cSAndroid Build Coastguard Worker 
StreamAlsa(StreamContext * context,const Metadata & metadata,int readWriteRetries)31*4d7e907cSAndroid Build Coastguard Worker StreamAlsa::StreamAlsa(StreamContext* context, const Metadata& metadata, int readWriteRetries)
32*4d7e907cSAndroid Build Coastguard Worker     : StreamCommonImpl(context, metadata),
33*4d7e907cSAndroid Build Coastguard Worker       mBufferSizeFrames(getContext().getBufferSizeInFrames()),
34*4d7e907cSAndroid Build Coastguard Worker       mFrameSizeBytes(getContext().getFrameSize()),
35*4d7e907cSAndroid Build Coastguard Worker       mSampleRate(getContext().getSampleRate()),
36*4d7e907cSAndroid Build Coastguard Worker       mIsInput(isInput(metadata)),
37*4d7e907cSAndroid Build Coastguard Worker       mConfig(alsa::getPcmConfig(getContext(), mIsInput)),
38*4d7e907cSAndroid Build Coastguard Worker       mReadWriteRetries(readWriteRetries) {}
39*4d7e907cSAndroid Build Coastguard Worker 
~StreamAlsa()40*4d7e907cSAndroid Build Coastguard Worker StreamAlsa::~StreamAlsa() {
41*4d7e907cSAndroid Build Coastguard Worker     cleanupWorker();
42*4d7e907cSAndroid Build Coastguard Worker }
43*4d7e907cSAndroid Build Coastguard Worker 
init()44*4d7e907cSAndroid Build Coastguard Worker ::android::status_t StreamAlsa::init() {
45*4d7e907cSAndroid Build Coastguard Worker     return mConfig.has_value() ? ::android::OK : ::android::NO_INIT;
46*4d7e907cSAndroid Build Coastguard Worker }
47*4d7e907cSAndroid Build Coastguard Worker 
drain(StreamDescriptor::DrainMode)48*4d7e907cSAndroid Build Coastguard Worker ::android::status_t StreamAlsa::drain(StreamDescriptor::DrainMode) {
49*4d7e907cSAndroid Build Coastguard Worker     if (!mIsInput) {
50*4d7e907cSAndroid Build Coastguard Worker         static constexpr float kMicrosPerSecond = MICROS_PER_SECOND;
51*4d7e907cSAndroid Build Coastguard Worker         const size_t delayUs = static_cast<size_t>(
52*4d7e907cSAndroid Build Coastguard Worker                 std::roundf(mBufferSizeFrames * kMicrosPerSecond / mSampleRate));
53*4d7e907cSAndroid Build Coastguard Worker         usleep(delayUs);
54*4d7e907cSAndroid Build Coastguard Worker     }
55*4d7e907cSAndroid Build Coastguard Worker     return ::android::OK;
56*4d7e907cSAndroid Build Coastguard Worker }
57*4d7e907cSAndroid Build Coastguard Worker 
flush()58*4d7e907cSAndroid Build Coastguard Worker ::android::status_t StreamAlsa::flush() {
59*4d7e907cSAndroid Build Coastguard Worker     return ::android::OK;
60*4d7e907cSAndroid Build Coastguard Worker }
61*4d7e907cSAndroid Build Coastguard Worker 
pause()62*4d7e907cSAndroid Build Coastguard Worker ::android::status_t StreamAlsa::pause() {
63*4d7e907cSAndroid Build Coastguard Worker     return ::android::OK;
64*4d7e907cSAndroid Build Coastguard Worker }
65*4d7e907cSAndroid Build Coastguard Worker 
standby()66*4d7e907cSAndroid Build Coastguard Worker ::android::status_t StreamAlsa::standby() {
67*4d7e907cSAndroid Build Coastguard Worker     mAlsaDeviceProxies.clear();
68*4d7e907cSAndroid Build Coastguard Worker     return ::android::OK;
69*4d7e907cSAndroid Build Coastguard Worker }
70*4d7e907cSAndroid Build Coastguard Worker 
start()71*4d7e907cSAndroid Build Coastguard Worker ::android::status_t StreamAlsa::start() {
72*4d7e907cSAndroid Build Coastguard Worker     if (!mAlsaDeviceProxies.empty()) {
73*4d7e907cSAndroid Build Coastguard Worker         // This is a resume after a pause.
74*4d7e907cSAndroid Build Coastguard Worker         return ::android::OK;
75*4d7e907cSAndroid Build Coastguard Worker     }
76*4d7e907cSAndroid Build Coastguard Worker     decltype(mAlsaDeviceProxies) alsaDeviceProxies;
77*4d7e907cSAndroid Build Coastguard Worker     for (const auto& device : getDeviceProfiles()) {
78*4d7e907cSAndroid Build Coastguard Worker         if ((device.direction == PCM_OUT && mIsInput) ||
79*4d7e907cSAndroid Build Coastguard Worker             (device.direction == PCM_IN && !mIsInput)) {
80*4d7e907cSAndroid Build Coastguard Worker             continue;
81*4d7e907cSAndroid Build Coastguard Worker         }
82*4d7e907cSAndroid Build Coastguard Worker         alsa::DeviceProxy proxy;
83*4d7e907cSAndroid Build Coastguard Worker         if (device.isExternal) {
84*4d7e907cSAndroid Build Coastguard Worker             // Always ask alsa configure as required since the configuration should be supported
85*4d7e907cSAndroid Build Coastguard Worker             // by the connected device. That is guaranteed by `setAudioPortConfig` and
86*4d7e907cSAndroid Build Coastguard Worker             // `setAudioPatch`.
87*4d7e907cSAndroid Build Coastguard Worker             proxy = alsa::openProxyForExternalDevice(
88*4d7e907cSAndroid Build Coastguard Worker                     device, const_cast<struct pcm_config*>(&mConfig.value()),
89*4d7e907cSAndroid Build Coastguard Worker                     true /*require_exact_match*/);
90*4d7e907cSAndroid Build Coastguard Worker         } else {
91*4d7e907cSAndroid Build Coastguard Worker             proxy = alsa::openProxyForAttachedDevice(
92*4d7e907cSAndroid Build Coastguard Worker                     device, const_cast<struct pcm_config*>(&mConfig.value()), mBufferSizeFrames);
93*4d7e907cSAndroid Build Coastguard Worker         }
94*4d7e907cSAndroid Build Coastguard Worker         if (proxy.get() == nullptr) {
95*4d7e907cSAndroid Build Coastguard Worker             return ::android::NO_INIT;
96*4d7e907cSAndroid Build Coastguard Worker         }
97*4d7e907cSAndroid Build Coastguard Worker         alsaDeviceProxies.push_back(std::move(proxy));
98*4d7e907cSAndroid Build Coastguard Worker     }
99*4d7e907cSAndroid Build Coastguard Worker     if (alsaDeviceProxies.empty()) {
100*4d7e907cSAndroid Build Coastguard Worker         return ::android::NO_INIT;
101*4d7e907cSAndroid Build Coastguard Worker     }
102*4d7e907cSAndroid Build Coastguard Worker     mAlsaDeviceProxies = std::move(alsaDeviceProxies);
103*4d7e907cSAndroid Build Coastguard Worker     return ::android::OK;
104*4d7e907cSAndroid Build Coastguard Worker }
105*4d7e907cSAndroid Build Coastguard Worker 
transfer(void * buffer,size_t frameCount,size_t * actualFrameCount,int32_t * latencyMs)106*4d7e907cSAndroid Build Coastguard Worker ::android::status_t StreamAlsa::transfer(void* buffer, size_t frameCount, size_t* actualFrameCount,
107*4d7e907cSAndroid Build Coastguard Worker                                          int32_t* latencyMs) {
108*4d7e907cSAndroid Build Coastguard Worker     if (mAlsaDeviceProxies.empty()) {
109*4d7e907cSAndroid Build Coastguard Worker         LOG(FATAL) << __func__ << ": no opened devices";
110*4d7e907cSAndroid Build Coastguard Worker         return ::android::NO_INIT;
111*4d7e907cSAndroid Build Coastguard Worker     }
112*4d7e907cSAndroid Build Coastguard Worker     const size_t bytesToTransfer = frameCount * mFrameSizeBytes;
113*4d7e907cSAndroid Build Coastguard Worker     unsigned maxLatency = 0;
114*4d7e907cSAndroid Build Coastguard Worker     if (mIsInput) {
115*4d7e907cSAndroid Build Coastguard Worker         // For input case, only support single device.
116*4d7e907cSAndroid Build Coastguard Worker         proxy_read_with_retries(mAlsaDeviceProxies[0].get(), buffer, bytesToTransfer,
117*4d7e907cSAndroid Build Coastguard Worker                                 mReadWriteRetries);
118*4d7e907cSAndroid Build Coastguard Worker         maxLatency = proxy_get_latency(mAlsaDeviceProxies[0].get());
119*4d7e907cSAndroid Build Coastguard Worker     } else {
120*4d7e907cSAndroid Build Coastguard Worker         alsa::applyGain(buffer, mGain, bytesToTransfer, mConfig.value().format, mConfig->channels);
121*4d7e907cSAndroid Build Coastguard Worker         for (auto& proxy : mAlsaDeviceProxies) {
122*4d7e907cSAndroid Build Coastguard Worker             proxy_write_with_retries(proxy.get(), buffer, bytesToTransfer, mReadWriteRetries);
123*4d7e907cSAndroid Build Coastguard Worker             maxLatency = std::max(maxLatency, proxy_get_latency(proxy.get()));
124*4d7e907cSAndroid Build Coastguard Worker         }
125*4d7e907cSAndroid Build Coastguard Worker     }
126*4d7e907cSAndroid Build Coastguard Worker     *actualFrameCount = frameCount;
127*4d7e907cSAndroid Build Coastguard Worker     maxLatency = std::min(maxLatency, static_cast<unsigned>(std::numeric_limits<int32_t>::max()));
128*4d7e907cSAndroid Build Coastguard Worker     *latencyMs = maxLatency;
129*4d7e907cSAndroid Build Coastguard Worker     return ::android::OK;
130*4d7e907cSAndroid Build Coastguard Worker }
131*4d7e907cSAndroid Build Coastguard Worker 
refinePosition(StreamDescriptor::Position * position)132*4d7e907cSAndroid Build Coastguard Worker ::android::status_t StreamAlsa::refinePosition(StreamDescriptor::Position* position) {
133*4d7e907cSAndroid Build Coastguard Worker     if (mAlsaDeviceProxies.empty()) {
134*4d7e907cSAndroid Build Coastguard Worker         LOG(WARNING) << __func__ << ": no opened devices";
135*4d7e907cSAndroid Build Coastguard Worker         return ::android::NO_INIT;
136*4d7e907cSAndroid Build Coastguard Worker     }
137*4d7e907cSAndroid Build Coastguard Worker     // Since the proxy can only count transferred frames since its creation,
138*4d7e907cSAndroid Build Coastguard Worker     // we override its counter value with ours and let it to correct for buffered frames.
139*4d7e907cSAndroid Build Coastguard Worker     alsa::resetTransferredFrames(mAlsaDeviceProxies[0], position->frames);
140*4d7e907cSAndroid Build Coastguard Worker     if (mIsInput) {
141*4d7e907cSAndroid Build Coastguard Worker         if (int ret = proxy_get_capture_position(mAlsaDeviceProxies[0].get(), &position->frames,
142*4d7e907cSAndroid Build Coastguard Worker                                                  &position->timeNs);
143*4d7e907cSAndroid Build Coastguard Worker             ret != 0) {
144*4d7e907cSAndroid Build Coastguard Worker             LOG(WARNING) << __func__ << ": failed to retrieve capture position: " << ret;
145*4d7e907cSAndroid Build Coastguard Worker             return ::android::INVALID_OPERATION;
146*4d7e907cSAndroid Build Coastguard Worker         }
147*4d7e907cSAndroid Build Coastguard Worker     } else {
148*4d7e907cSAndroid Build Coastguard Worker         uint64_t hwFrames;
149*4d7e907cSAndroid Build Coastguard Worker         struct timespec timestamp;
150*4d7e907cSAndroid Build Coastguard Worker         if (int ret = proxy_get_presentation_position(mAlsaDeviceProxies[0].get(), &hwFrames,
151*4d7e907cSAndroid Build Coastguard Worker                                                       &timestamp);
152*4d7e907cSAndroid Build Coastguard Worker             ret == 0) {
153*4d7e907cSAndroid Build Coastguard Worker             if (hwFrames > std::numeric_limits<int64_t>::max()) {
154*4d7e907cSAndroid Build Coastguard Worker                 hwFrames -= std::numeric_limits<int64_t>::max();
155*4d7e907cSAndroid Build Coastguard Worker             }
156*4d7e907cSAndroid Build Coastguard Worker             position->frames = static_cast<int64_t>(hwFrames);
157*4d7e907cSAndroid Build Coastguard Worker             position->timeNs = audio_utils_ns_from_timespec(&timestamp);
158*4d7e907cSAndroid Build Coastguard Worker         } else {
159*4d7e907cSAndroid Build Coastguard Worker             LOG(WARNING) << __func__ << ": failed to retrieve presentation position: " << ret;
160*4d7e907cSAndroid Build Coastguard Worker             return ::android::INVALID_OPERATION;
161*4d7e907cSAndroid Build Coastguard Worker         }
162*4d7e907cSAndroid Build Coastguard Worker     }
163*4d7e907cSAndroid Build Coastguard Worker     return ::android::OK;
164*4d7e907cSAndroid Build Coastguard Worker }
165*4d7e907cSAndroid Build Coastguard Worker 
shutdown()166*4d7e907cSAndroid Build Coastguard Worker void StreamAlsa::shutdown() {
167*4d7e907cSAndroid Build Coastguard Worker     mAlsaDeviceProxies.clear();
168*4d7e907cSAndroid Build Coastguard Worker }
169*4d7e907cSAndroid Build Coastguard Worker 
setGain(float gain)170*4d7e907cSAndroid Build Coastguard Worker ndk::ScopedAStatus StreamAlsa::setGain(float gain) {
171*4d7e907cSAndroid Build Coastguard Worker     mGain = gain;
172*4d7e907cSAndroid Build Coastguard Worker     return ndk::ScopedAStatus::ok();
173*4d7e907cSAndroid Build Coastguard Worker }
174*4d7e907cSAndroid Build Coastguard Worker 
175*4d7e907cSAndroid Build Coastguard Worker }  // namespace aidl::android::hardware::audio::core
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