summaryrefslogtreecommitdiffstats
path: root/services/audioflinger/FastMixer.cpp
blob: 45c68b55df4345b9efda105da8345fe6d721321a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// <IMPORTANT_WARNING>
// Design rules for threadLoop() are given in the comments at section "Fast mixer thread" of
// StateQueue.h.  In particular, avoid library and system calls except at well-known points.
// The design rules are only for threadLoop(), and don't apply to FastMixerDumpState methods.
// </IMPORTANT_WARNING>

#define LOG_TAG "FastMixer"
//#define LOG_NDEBUG 0

#define ATRACE_TAG ATRACE_TAG_AUDIO

#include "Configuration.h"
#include <time.h>
#include <utils/Debug.h>
#include <utils/Log.h>
#include <utils/Trace.h>
#include <system/audio.h>
#ifdef FAST_THREAD_STATISTICS
#include <cpustats/CentralTendencyStatistics.h>
#ifdef CPU_FREQUENCY_STATISTICS
#include <cpustats/ThreadCpuUsage.h>
#endif
#endif
#include <audio_utils/format.h>
#include "AudioMixer.h"
#include "FastMixer.h"

#define FCC_2                       2   // fixed channel count assumption

namespace android {

/*static*/ const FastMixerState FastMixer::sInitial;

FastMixer::FastMixer() : FastThread(),
    mSlopNs(0),
    // mFastTrackNames
    // mGenerations
    mOutputSink(NULL),
    mOutputSinkGen(0),
    mMixer(NULL),
    mSinkBuffer(NULL),
    mSinkBufferSize(0),
    mSinkChannelCount(FCC_2),
    mMixerBuffer(NULL),
    mMixerBufferSize(0),
    mMixerBufferFormat(AUDIO_FORMAT_PCM_16_BIT),
    mMixerBufferState(UNDEFINED),
    mFormat(Format_Invalid),
    mSampleRate(0),
    mFastTracksGen(0),
    mTotalNativeFramesWritten(0),
    // timestamp
    mNativeFramesWrittenButNotPresented(0)   // the = 0 is to silence the compiler
{
    // FIXME pass sInitial as parameter to base class constructor, and make it static local
    mPrevious = &sInitial;
    mCurrent = &sInitial;

    mDummyDumpState = &mDummyFastMixerDumpState;
    // TODO: Add channel mask to NBAIO_Format.
    // We assume that the channel mask must be a valid positional channel mask.
    mSinkChannelMask = audio_channel_out_mask_from_count(mSinkChannelCount);

    unsigned i;
    for (i = 0; i < FastMixerState::kMaxFastTracks; ++i) {
        mFastTrackNames[i] = -1;
        mGenerations[i] = 0;
    }
#ifdef FAST_THREAD_STATISTICS
    mOldLoad.tv_sec = 0;
    mOldLoad.tv_nsec = 0;
#endif
}

FastMixer::~FastMixer()
{
}

FastMixerStateQueue* FastMixer::sq()
{
    return &mSQ;
}

const FastThreadState *FastMixer::poll()
{
    return mSQ.poll();
}

void FastMixer::setLog(NBLog::Writer *logWriter)
{
    if (mMixer != NULL) {
        mMixer->setLog(logWriter);
    }
}

void FastMixer::onIdle()
{
    mPreIdle = *(const FastMixerState *)mCurrent;
    mCurrent = &mPreIdle;
}

void FastMixer::onExit()
{
    delete mMixer;
    free(mMixerBuffer);
    free(mSinkBuffer);
}

bool FastMixer::isSubClassCommand(FastThreadState::Command command)
{
    switch ((FastMixerState::Command) command) {
    case FastMixerState::MIX:
    case FastMixerState::WRITE:
    case FastMixerState::MIX_WRITE:
        return true;
    default:
        return false;
    }
}

void FastMixer::onStateChange()
{
    const FastMixerState * const current = (const FastMixerState *) mCurrent;
    const FastMixerState * const previous = (const FastMixerState *) mPrevious;
    FastMixerDumpState * const dumpState = (FastMixerDumpState *) mDumpState;
    const size_t frameCount = current->mFrameCount;

    // handle state change here, but since we want to diff the state,
    // we're prepared for previous == &sInitial the first time through
    unsigned previousTrackMask;

    // check for change in output HAL configuration
    NBAIO_Format previousFormat = mFormat;
    if (current->mOutputSinkGen != mOutputSinkGen) {
        mOutputSink = current->mOutputSink;
        mOutputSinkGen = current->mOutputSinkGen;
        if (mOutputSink == NULL) {
            mFormat = Format_Invalid;
            mSampleRate = 0;
            mSinkChannelCount = 0;
            mSinkChannelMask = AUDIO_CHANNEL_NONE;
        } else {
            mFormat = mOutputSink->format();
            mSampleRate = Format_sampleRate(mFormat);
            mSinkChannelCount = Format_channelCount(mFormat);
            LOG_ALWAYS_FATAL_IF(mSinkChannelCount > AudioMixer::MAX_NUM_CHANNELS);

            // TODO: Add channel mask to NBAIO_Format
            // We assume that the channel mask must be a valid positional channel mask.
            mSinkChannelMask = audio_channel_out_mask_from_count(mSinkChannelCount);
        }
        dumpState->mSampleRate = mSampleRate;
    }

    if ((!Format_isEqual(mFormat, previousFormat)) || (frameCount != previous->mFrameCount)) {
        // FIXME to avoid priority inversion, don't delete here
        delete mMixer;
        mMixer = NULL;
        free(mMixerBuffer);
        mMixerBuffer = NULL;
        free(mSinkBuffer);
        mSinkBuffer = NULL;
        if (frameCount > 0 && mSampleRate > 0) {
            // The mixer produces either 16 bit PCM or float output, select
            // float output if the HAL supports higher than 16 bit precision.
            mMixerBufferFormat = mFormat.mFormat == AUDIO_FORMAT_PCM_16_BIT ?
                    AUDIO_FORMAT_PCM_16_BIT : AUDIO_FORMAT_PCM_FLOAT;
            // FIXME new may block for unbounded time at internal mutex of the heap
            //       implementation; it would be better to have normal mixer allocate for us
            //       to avoid blocking here and to prevent possible priority inversion
            mMixer = new AudioMixer(frameCount, mSampleRate, FastMixerState::kMaxFastTracks);
            const size_t mixerFrameSize = mSinkChannelCount
                    * audio_bytes_per_sample(mMixerBufferFormat);
            mMixerBufferSize = mixerFrameSize * frameCount;
            (void)posix_memalign(&mMixerBuffer, 32, mMixerBufferSize);
            const size_t sinkFrameSize = mSinkChannelCount
                    * audio_bytes_per_sample(mFormat.mFormat);
            if (sinkFrameSize > mixerFrameSize) { // need a sink buffer
                mSinkBufferSize = sinkFrameSize * frameCount;
                (void)posix_memalign(&mSinkBuffer, 32, mSinkBufferSize);
            }
            mPeriodNs = (frameCount * 1000000000LL) / mSampleRate;    // 1.00
            mUnderrunNs = (frameCount * 1750000000LL) / mSampleRate;  // 1.75
            mOverrunNs = (frameCount * 500000000LL) / mSampleRate;    // 0.50
            mForceNs = (frameCount * 950000000LL) / mSampleRate;      // 0.95
            mWarmupNsMin = (frameCount * 750000000LL) / mSampleRate;  // 0.75
            mWarmupNsMax = (frameCount * 1250000000LL) / mSampleRate; // 1.25
        } else {
            mPeriodNs = 0;
            mUnderrunNs = 0;
            mOverrunNs = 0;
            mForceNs = 0;
            mWarmupNsMin = 0;
            mWarmupNsMax = LONG_MAX;
        }
        mMixerBufferState = UNDEFINED;
#if !LOG_NDEBUG
        for (unsigned i = 0; i < FastMixerState::kMaxFastTracks; ++i) {
            mFastTrackNames[i] = -1;
        }
#endif
        // we need to reconfigure all active tracks
        previousTrackMask = 0;
        mFastTracksGen = current->mFastTracksGen - 1;
        dumpState->mFrameCount = frameCount;
    } else {
        previousTrackMask = previous->mTrackMask;
    }

    // check for change in active track set
    const unsigned currentTrackMask = current->mTrackMask;
    dumpState->mTrackMask = currentTrackMask;
    if (current->mFastTracksGen != mFastTracksGen) {
        ALOG_ASSERT(mMixerBuffer != NULL);
        int name;

        // process removed tracks first to avoid running out of track names
        unsigned removedTracks = previousTrackMask & ~currentTrackMask;
        while (removedTracks != 0) {
            int i = __builtin_ctz(removedTracks);
            removedTracks &= ~(1 << i);
            const FastTrack* fastTrack = &current->mFastTracks[i];
            ALOG_ASSERT(fastTrack->mBufferProvider == NULL);
            if (mMixer != NULL) {
                name = mFastTrackNames[i];
                ALOG_ASSERT(name >= 0);
                mMixer->deleteTrackName(name);
            }
#if !LOG_NDEBUG
            mFastTrackNames[i] = -1;
#endif
            // don't reset track dump state, since other side is ignoring it
            mGenerations[i] = fastTrack->mGeneration;
        }

        // now process added tracks
        unsigned addedTracks = currentTrackMask & ~previousTrackMask;
        while (addedTracks != 0) {
            int i = __builtin_ctz(addedTracks);
            addedTracks &= ~(1 << i);
            const FastTrack* fastTrack = &current->mFastTracks[i];
            AudioBufferProvider *bufferProvider = fastTrack->mBufferProvider;
            ALOG_ASSERT(bufferProvider != NULL && mFastTrackNames[i] == -1);
            if (mMixer != NULL) {
                name = mMixer->getTrackName(fastTrack->mChannelMask,
                        fastTrack->mFormat, AUDIO_SESSION_OUTPUT_MIX);
                ALOG_ASSERT(name >= 0);
                mFastTrackNames[i] = name;
                mMixer->setBufferProvider(name, bufferProvider);
                mMixer->setParameter(name, AudioMixer::TRACK, AudioMixer::MAIN_BUFFER,
                        (void *)mMixerBuffer);
                // newly allocated track names default to full scale volume
                mMixer->setParameter(
                        name,
                        AudioMixer::TRACK,
                        AudioMixer::MIXER_FORMAT, (void *)mMixerBufferFormat);
                mMixer->setParameter(name, AudioMixer::TRACK, AudioMixer::FORMAT,
                        (void *)(uintptr_t)fastTrack->mFormat);
                mMixer->setParameter(name, AudioMixer::TRACK, AudioMixer::CHANNEL_MASK,
                        (void *)(uintptr_t)fastTrack->mChannelMask);
                mMixer->setParameter(name, AudioMixer::TRACK, AudioMixer::MIXER_CHANNEL_MASK,
                        (void *)(uintptr_t)mSinkChannelMask);
                mMixer->enable(name);
            }
            mGenerations[i] = fastTrack->mGeneration;
        }

        // finally process (potentially) modified tracks; these use the same slot
        // but may have a different buffer provider or volume provider
        unsigned modifiedTracks = currentTrackMask & previousTrackMask;
        while (modifiedTracks != 0) {
            int i = __builtin_ctz(modifiedTracks);
            modifiedTracks &= ~(1 << i);
            const FastTrack* fastTrack = &current->mFastTracks[i];
            if (fastTrack->mGeneration != mGenerations[i]) {
                // this track was actually modified
                AudioBufferProvider *bufferProvider = fastTrack->mBufferProvider;
                ALOG_ASSERT(bufferProvider != NULL);
                if (mMixer != NULL) {
                    name = mFastTrackNames[i];
                    ALOG_ASSERT(name >= 0);
                    mMixer->setBufferProvider(name, bufferProvider);
                    if (fastTrack->mVolumeProvider == NULL) {
                        float f = AudioMixer::UNITY_GAIN_FLOAT;
                        mMixer->setParameter(name, AudioMixer::VOLUME, AudioMixer::VOLUME0, &f);
                        mMixer->setParameter(name, AudioMixer::VOLUME, AudioMixer::VOLUME1, &f);
                    }
                    mMixer->setParameter(name, AudioMixer::RESAMPLE,
                            AudioMixer::REMOVE, NULL);
                    mMixer->setParameter(
                            name,
                            AudioMixer::TRACK,
                            AudioMixer::MIXER_FORMAT, (void *)mMixerBufferFormat);
                    mMixer->setParameter(name, AudioMixer::TRACK, AudioMixer::FORMAT,
                            (void *)(uintptr_t)fastTrack->mFormat);
                    mMixer->setParameter(name, AudioMixer::TRACK, AudioMixer::CHANNEL_MASK,
                            (void *)(uintptr_t)fastTrack->mChannelMask);
                    mMixer->setParameter(name, AudioMixer::TRACK, AudioMixer::MIXER_CHANNEL_MASK,
                            (void *)(uintptr_t)mSinkChannelMask);
                    // already enabled
                }
                mGenerations[i] = fastTrack->mGeneration;
            }
        }

        mFastTracksGen = current->mFastTracksGen;

        dumpState->mNumTracks = popcount(currentTrackMask);
    }
}

void FastMixer::onWork()
{
    const FastMixerState * const current = (const FastMixerState *) mCurrent;
    FastMixerDumpState * const dumpState = (FastMixerDumpState *) mDumpState;
    const FastMixerState::Command command = mCommand;
    const size_t frameCount = current->mFrameCount;

    if ((command & FastMixerState::MIX) && (mMixer != NULL) && mIsWarm) {
        ALOG_ASSERT(mMixerBuffer != NULL);
        // for each track, update volume and check for underrun
        unsigned currentTrackMask = current->mTrackMask;
        while (currentTrackMask != 0) {
            int i = __builtin_ctz(currentTrackMask);
            currentTrackMask &= ~(1 << i);
            const FastTrack* fastTrack = &current->mFastTracks[i];

            // Refresh the per-track timestamp
            if (mTimestampStatus == NO_ERROR) {
                uint32_t trackFramesWrittenButNotPresented =
                    mNativeFramesWrittenButNotPresented;
                uint32_t trackFramesWritten = fastTrack->mBufferProvider->framesReleased();
                // Can't provide an AudioTimestamp before first frame presented,
                // or during the brief 32-bit wraparound window
                if (trackFramesWritten >= trackFramesWrittenButNotPresented) {
                    AudioTimestamp perTrackTimestamp;
                    perTrackTimestamp.mPosition =
                            trackFramesWritten - trackFramesWrittenButNotPresented;
                    perTrackTimestamp.mTime = mTimestamp.mTime;
                    fastTrack->mBufferProvider->onTimestamp(perTrackTimestamp);
                }
            }

            int name = mFastTrackNames[i];
            ALOG_ASSERT(name >= 0);
            if (fastTrack->mVolumeProvider != NULL) {
                gain_minifloat_packed_t vlr = fastTrack->mVolumeProvider->getVolumeLR();
                float vlf = float_from_gain(gain_minifloat_unpack_left(vlr));
                float vrf = float_from_gain(gain_minifloat_unpack_right(vlr));

                mMixer->setParameter(name, AudioMixer::VOLUME, AudioMixer::VOLUME0, &vlf);
                mMixer->setParameter(name, AudioMixer::VOLUME, AudioMixer::VOLUME1, &vrf);
            }
            // FIXME The current implementation of framesReady() for fast tracks
            // takes a tryLock, which can block
            // up to 1 ms.  If enough active tracks all blocked in sequence, this would result
            // in the overall fast mix cycle being delayed.  Should use a non-blocking FIFO.
            size_t framesReady = fastTrack->mBufferProvider->framesReady();
            if (ATRACE_ENABLED()) {
                // I wish we had formatted trace names
                char traceName[16];
                strcpy(traceName, "fRdy");
                traceName[4] = i + (i < 10 ? '0' : 'A' - 10);
                traceName[5] = '\0';
                ATRACE_INT(traceName, framesReady);
            }
            FastTrackDump *ftDump = &dumpState->mTracks[i];
            FastTrackUnderruns underruns = ftDump->mUnderruns;
            if (framesReady < frameCount) {
                if (framesReady == 0) {
                    underruns.mBitFields.mEmpty++;
                    underruns.mBitFields.mMostRecent = UNDERRUN_EMPTY;
                    mMixer->disable(name);
                } else {
                    // allow mixing partial buffer
                    underruns.mBitFields.mPartial++;
                    underruns.mBitFields.mMostRecent = UNDERRUN_PARTIAL;
                    mMixer->enable(name);
                }
            } else {
                underruns.mBitFields.mFull++;
                underruns.mBitFields.mMostRecent = UNDERRUN_FULL;
                mMixer->enable(name);
            }
            ftDump->mUnderruns = underruns;
            ftDump->mFramesReady = framesReady;
        }

        int64_t pts;
        if (mOutputSink == NULL || (OK != mOutputSink->getNextWriteTimestamp(&pts))) {
            pts = AudioBufferProvider::kInvalidPTS;
        }

        // process() is CPU-bound
        mMixer->process(pts);
        mMixerBufferState = MIXED;
    } else if (mMixerBufferState == MIXED) {
        mMixerBufferState = UNDEFINED;
    }
    //bool didFullWrite = false;    // dumpsys could display a count of partial writes
    if ((command & FastMixerState::WRITE) && (mOutputSink != NULL) && (mMixerBuffer != NULL)) {
        if (mMixerBufferState == UNDEFINED) {
            memset(mMixerBuffer, 0, mMixerBufferSize);
            mMixerBufferState = ZEROED;
        }
        // prepare the buffer used to write to sink
        void *buffer = mSinkBuffer != NULL ? mSinkBuffer : mMixerBuffer;
        if (mFormat.mFormat != mMixerBufferFormat) { // sink format not the same as mixer format
            memcpy_by_audio_format(buffer, mFormat.mFormat, mMixerBuffer, mMixerBufferFormat,
                    frameCount * Format_channelCount(mFormat));
        }
        // if non-NULL, then duplicate write() to this non-blocking sink
        NBAIO_Sink* teeSink;
        if ((teeSink = current->mTeeSink) != NULL) {
            (void) teeSink->write(buffer, frameCount);
        }
        // FIXME write() is non-blocking and lock-free for a properly implemented NBAIO sink,
        //       but this code should be modified to handle both non-blocking and blocking sinks
        dumpState->mWriteSequence++;
        ATRACE_BEGIN("write");
        ssize_t framesWritten = mOutputSink->write(buffer, frameCount);
        ATRACE_END();
        dumpState->mWriteSequence++;
        if (framesWritten >= 0) {
            ALOG_ASSERT((size_t) framesWritten <= frameCount);
            mTotalNativeFramesWritten += framesWritten;
            dumpState->mFramesWritten = mTotalNativeFramesWritten;
            //if ((size_t) framesWritten == frameCount) {
            //    didFullWrite = true;
            //}
        } else {
            dumpState->mWriteErrors++;
        }
        mAttemptedWrite = true;
        // FIXME count # of writes blocked excessively, CPU usage, etc. for dump

        mTimestampStatus = mOutputSink->getTimestamp(mTimestamp);
        if (mTimestampStatus == NO_ERROR) {
            uint32_t totalNativeFramesPresented = mTimestamp.mPosition;
            if (totalNativeFramesPresented <= mTotalNativeFramesWritten) {
                mNativeFramesWrittenButNotPresented =
                    mTotalNativeFramesWritten - totalNativeFramesPresented;
            } else {
                // HAL reported that more frames were presented than were written
                mTimestampStatus = INVALID_OPERATION;
            }
        }
    }
}

}   // namespace android