AAudioServiceStreamMMAP.cpp revision 71f35bb687476694882a617ba4a810a0bb56fe23 
1/*
2 * Copyright (C) 2017 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#define LOG_TAG "AAudioService"
18//#define LOG_NDEBUG 0
19#include <utils/Log.h>
20
21#include <atomic>
22#include <stdint.h>
23
24#include <utils/String16.h>
25#include <media/nbaio/AudioStreamOutSink.h>
26#include <media/MmapStreamInterface.h>
27
28#include "AAudioServiceStreamBase.h"
29#include "AAudioServiceStreamMMAP.h"
30#include "binding/AudioEndpointParcelable.h"
31#include "SharedMemoryProxy.h"
32#include "utility/AAudioUtilities.h"
33
34using namespace android;
35using namespace aaudio;
36
37#define AAUDIO_BUFFER_CAPACITY_MIN    4 * 512
38#define AAUDIO_SAMPLE_RATE_DEFAULT    48000
39
40/**
41 * Stream that uses an MMAP buffer.
42 */
43
44AAudioServiceStreamMMAP::AAudioServiceStreamMMAP()
45        : AAudioServiceStreamBase()
46        , mMmapStreamCallback(new MyMmapStreamCallback(*this))
47        , mPreviousFrameCounter(0)
48        , mMmapStream(nullptr) {
49}
50
51AAudioServiceStreamMMAP::~AAudioServiceStreamMMAP() {
52    close();
53}
54
55aaudio_result_t AAudioServiceStreamMMAP::close() {
56    ALOGD("AAudioServiceStreamMMAP::close() called, %p", mMmapStream.get());
57    mMmapStream.clear(); // TODO review. Is that all we have to do?
58    // Apparently the above close is asynchronous. An attempt to open a new device
59    // right after a close can fail. Also some callbacks may still be in flight!
60    // FIXME Make closing synchronous.
61    AudioClock::sleepForNanos(100 * AAUDIO_NANOS_PER_MILLISECOND);
62
63    return AAudioServiceStreamBase::close();
64}
65
66// Open stream on HAL and pass information about the shared memory buffer back to the client.
67aaudio_result_t AAudioServiceStreamMMAP::open(const aaudio::AAudioStreamRequest &request,
68                                       aaudio::AAudioStreamConfiguration &configurationOutput) {
69    const audio_attributes_t attributes = {
70        .content_type = AUDIO_CONTENT_TYPE_MUSIC,
71        .usage = AUDIO_USAGE_MEDIA,
72        .source = AUDIO_SOURCE_DEFAULT,
73        .flags = AUDIO_FLAG_LOW_LATENCY,
74        .tags = ""
75    };
76    audio_config_base_t config;
77
78    aaudio_result_t result = AAudioServiceStreamBase::open(request, configurationOutput);
79    if (result != AAUDIO_OK) {
80        ALOGE("AAudioServiceStreamBase open returned %d", result);
81        return result;
82    }
83
84    const AAudioStreamConfiguration &configurationInput = request.getConstantConfiguration();
85    audio_port_handle_t deviceId = configurationInput.getDeviceId();
86
87    // ALOGI("open request dump()");
88    // request.dump();
89
90    mMmapClient.clientUid = request.getUserId();
91    mMmapClient.clientPid = request.getProcessId();
92    aaudio_direction_t direction = request.getDirection();
93
94    // Fill in config
95    aaudio_audio_format_t aaudioFormat = configurationInput.getAudioFormat();
96    if (aaudioFormat == AAUDIO_UNSPECIFIED || aaudioFormat == AAUDIO_FORMAT_PCM_FLOAT) {
97        ALOGI("open forcing use of AAUDIO_FORMAT_PCM_I16");
98        aaudioFormat = AAUDIO_FORMAT_PCM_I16;
99    }
100    config.format = AAudioConvert_aaudioToAndroidDataFormat(aaudioFormat);
101
102    int32_t aaudioSampleRate = configurationInput.getSampleRate();
103    if (aaudioSampleRate == AAUDIO_UNSPECIFIED) {
104        aaudioSampleRate = AAUDIO_SAMPLE_RATE_DEFAULT;
105    }
106    config.sample_rate = aaudioSampleRate;
107
108    int32_t aaudioSamplesPerFrame = configurationInput.getSamplesPerFrame();
109
110    if (direction == AAUDIO_DIRECTION_OUTPUT) {
111        config.channel_mask = (aaudioSamplesPerFrame == AAUDIO_UNSPECIFIED)
112                            ? AUDIO_CHANNEL_OUT_STEREO
113                            : audio_channel_out_mask_from_count(aaudioSamplesPerFrame);
114    } else if (direction == AAUDIO_DIRECTION_INPUT) {
115        config.channel_mask =  (aaudioSamplesPerFrame == AAUDIO_UNSPECIFIED)
116                            ? AUDIO_CHANNEL_IN_STEREO
117                            : audio_channel_in_mask_from_count(aaudioSamplesPerFrame);
118    } else {
119        ALOGE("openMmapStream - invalid direction = %d", direction);
120        return AAUDIO_ERROR_ILLEGAL_ARGUMENT;
121    }
122
123    mMmapClient.packageName.setTo(String16("aaudio_service")); // FIXME what should we do here?
124
125    MmapStreamInterface::stream_direction_t streamDirection = (direction == AAUDIO_DIRECTION_OUTPUT)
126        ? MmapStreamInterface::DIRECTION_OUTPUT : MmapStreamInterface::DIRECTION_INPUT;
127
128    // Open HAL stream.
129    status_t status = MmapStreamInterface::openMmapStream(streamDirection,
130                                                          &attributes,
131                                                          &config,
132                                                          mMmapClient,
133                                                          &deviceId,
134                                                          mMmapStreamCallback,
135                                                          mMmapStream);
136    if (status != OK) {
137        ALOGE("openMmapStream returned status %d", status);
138        return AAUDIO_ERROR_UNAVAILABLE;
139    }
140
141    // Create MMAP/NOIRQ buffer.
142    int32_t minSizeFrames = configurationInput.getBufferCapacity();
143    if (minSizeFrames == 0) { // zero will get rejected
144        minSizeFrames = AAUDIO_BUFFER_CAPACITY_MIN;
145    }
146    status = mMmapStream->createMmapBuffer(minSizeFrames, &mMmapBufferinfo);
147    if (status != OK) {
148        ALOGE("%s: createMmapBuffer() returned status %d, return AAUDIO_ERROR_UNAVAILABLE",
149              __FILE__, status);
150        return AAUDIO_ERROR_UNAVAILABLE;
151    } else {
152        ALOGD("createMmapBuffer status %d shared_address = %p buffer_size %d burst_size %d",
153              status, mMmapBufferinfo.shared_memory_address,
154              mMmapBufferinfo.buffer_size_frames,
155              mMmapBufferinfo.burst_size_frames);
156    }
157
158    // Get information about the stream and pass it back to the caller.
159    mSamplesPerFrame = (direction == AAUDIO_DIRECTION_OUTPUT)
160                           ? audio_channel_count_from_out_mask(config.channel_mask)
161                           : audio_channel_count_from_in_mask(config.channel_mask);
162
163    mAudioDataFileDescriptor = mMmapBufferinfo.shared_memory_fd;
164    mFramesPerBurst = mMmapBufferinfo.burst_size_frames;
165    mCapacityInFrames = mMmapBufferinfo.buffer_size_frames;
166    mAudioFormat = AAudioConvert_androidToAAudioDataFormat(config.format);
167    mSampleRate = config.sample_rate;
168
169    // Fill in AAudioStreamConfiguration
170    configurationOutput.setSampleRate(mSampleRate);
171    configurationOutput.setSamplesPerFrame(mSamplesPerFrame);
172    configurationOutput.setAudioFormat(mAudioFormat);
173    configurationOutput.setDeviceId(deviceId);
174
175    return AAUDIO_OK;
176}
177
178
179/**
180 * Start the flow of data.
181 */
182aaudio_result_t AAudioServiceStreamMMAP::start() {
183    if (mMmapStream == nullptr) return AAUDIO_ERROR_NULL;
184    aaudio_result_t result = mMmapStream->start(mMmapClient, &mPortHandle);
185    if (result != AAUDIO_OK) {
186        ALOGE("AAudioServiceStreamMMAP::start() mMmapStream->start() returned %d", result);
187        processError();
188    } else {
189        result = AAudioServiceStreamBase::start();
190    }
191    return result;
192}
193
194/**
195 * Stop the flow of data such that start() can resume with loss of data.
196 */
197aaudio_result_t AAudioServiceStreamMMAP::pause() {
198    if (mMmapStream == nullptr) return AAUDIO_ERROR_NULL;
199
200    aaudio_result_t result1 = AAudioServiceStreamBase::pause();
201    aaudio_result_t result2 = mMmapStream->stop(mPortHandle);
202    mFramesRead.reset32();
203    return (result1 != AAUDIO_OK) ? result1 : result2;
204}
205
206aaudio_result_t AAudioServiceStreamMMAP::stop() {
207    if (mMmapStream == nullptr) return AAUDIO_ERROR_NULL;
208
209    aaudio_result_t result1 = AAudioServiceStreamBase::stop();
210    aaudio_result_t result2 = mMmapStream->stop(mPortHandle);
211    mFramesRead.reset32();
212    return (result1 != AAUDIO_OK) ? result1 : result2;
213}
214
215/**
216 *  Discard any data held by the underlying HAL or Service.
217 */
218aaudio_result_t AAudioServiceStreamMMAP::flush() {
219    if (mMmapStream == nullptr) return AAUDIO_ERROR_NULL;
220    // TODO how do we flush an MMAP/NOIRQ buffer? sync pointers?
221    ALOGD("AAudioServiceStreamMMAP::flush() send AAUDIO_SERVICE_EVENT_FLUSHED");
222    sendServiceEvent(AAUDIO_SERVICE_EVENT_FLUSHED);
223    mState = AAUDIO_STREAM_STATE_FLUSHED;
224    return AAudioServiceStreamBase::flush();;
225}
226
227
228aaudio_result_t AAudioServiceStreamMMAP::getFreeRunningPosition(int64_t *positionFrames,
229                                                                int64_t *timeNanos) {
230    struct audio_mmap_position position;
231    if (mMmapStream == nullptr) {
232        processError();
233        return AAUDIO_ERROR_NULL;
234    }
235    status_t status = mMmapStream->getMmapPosition(&position);
236    if (status != OK) {
237        ALOGE("sendCurrentTimestamp(): getMmapPosition() returned %d", status);
238        processError();
239        return AAudioConvert_androidToAAudioResult(status);
240    } else {
241        mFramesRead.update32(position.position_frames);
242        *positionFrames = mFramesRead.get();
243        *timeNanos = position.time_nanoseconds;
244    }
245    return AAUDIO_OK;
246}
247
248void AAudioServiceStreamMMAP::onTearDown() {
249    ALOGD("AAudioServiceStreamMMAP::onTearDown() called - TODO");
250};
251
252void AAudioServiceStreamMMAP::onVolumeChanged(audio_channel_mask_t channels,
253                     android::Vector<float> values) {
254    // TODO do we really need a different volume for each channel?
255    float volume = values[0];
256    ALOGD("AAudioServiceStreamMMAP::onVolumeChanged() volume[0] = %f", volume);
257    sendServiceEvent(AAUDIO_SERVICE_EVENT_VOLUME, volume);
258};
259
260void AAudioServiceStreamMMAP::onRoutingChanged(audio_port_handle_t deviceId) {
261    ALOGD("AAudioServiceStreamMMAP::onRoutingChanged() called with %d, old = %d",
262          deviceId, mPortHandle);
263    if (mPortHandle > 0 && mPortHandle != deviceId) {
264        sendServiceEvent(AAUDIO_SERVICE_EVENT_DISCONNECTED);
265    }
266    mPortHandle = deviceId;
267};
268
269/**
270 * Get an immutable description of the data queue from the HAL.
271 */
272aaudio_result_t AAudioServiceStreamMMAP::getDownDataDescription(AudioEndpointParcelable &parcelable)
273{
274    // Gather information on the data queue based on HAL info.
275    int32_t bytesPerFrame = calculateBytesPerFrame();
276    int32_t capacityInBytes = mCapacityInFrames * bytesPerFrame;
277    int fdIndex = parcelable.addFileDescriptor(mAudioDataFileDescriptor, capacityInBytes);
278    parcelable.mDownDataQueueParcelable.setupMemory(fdIndex, 0, capacityInBytes);
279    parcelable.mDownDataQueueParcelable.setBytesPerFrame(bytesPerFrame);
280    parcelable.mDownDataQueueParcelable.setFramesPerBurst(mFramesPerBurst);
281    parcelable.mDownDataQueueParcelable.setCapacityInFrames(mCapacityInFrames);
282    return AAUDIO_OK;
283}