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-rw-r--r--services/audioflinger/AudioFlinger.cpp2
-rw-r--r--services/audioflinger/Threads.cpp157
-rw-r--r--services/audioflinger/Threads.h16
3 files changed, 116 insertions, 59 deletions
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 79c41f7..c9c9f8a 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -1717,9 +1717,11 @@ audio_io_handle_t AudioFlinger::openInput(audio_module_handle_t module,
reqFormat == config.format && config.format == AUDIO_FORMAT_PCM_16_BIT &&
(config.sample_rate <= 2 * reqSamplingRate) &&
(popcount(config.channel_mask) <= FCC_2) && (popcount(reqChannelMask) <= FCC_2)) {
+ // FIXME describe the change proposed by HAL (save old values so we can log them here)
ALOGV("openInput() reopening with proposed sampling rate and channel mask");
inStream = NULL;
status = inHwHal->open_input_stream(inHwHal, id, *pDevices, &config, &inStream);
+ // FIXME log this new status; HAL should not propose any further changes
}
if (status == NO_ERROR && inStream != NULL) {
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 7474f1a..17e2a57 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -4378,7 +4378,9 @@ AudioFlinger::RecordThread::RecordThread(const sp<AudioFlinger>& audioFlinger,
) :
ThreadBase(audioFlinger, id, outDevice, inDevice, RECORD),
mInput(input), mResampler(NULL), mRsmpOutBuffer(NULL), mRsmpInBuffer(NULL),
- // mRsmpInIndex set by readInputParameters()
+ // mRsmpInFrames, mRsmpInFramesP2, mRsmpInUnrel, mRsmpInFront, and mRsmpInRear
+ // are set by readInputParameters()
+ // mRsmpInIndex LEGACY
mReqChannelCount(popcount(channelMask)),
mReqSampleRate(sampleRate)
// mBytesRead is only meaningful while active, and so is cleared in start()
@@ -4583,17 +4585,60 @@ bool AudioFlinger::RecordThread::threadLoop()
} else {
// resampling
+ // avoid busy-waiting if client doesn't keep up
+ bool madeProgress = false;
+
+ // keep mRsmpInBuffer full so resampler always has sufficient input
+ for (;;) {
+ int32_t rear = mRsmpInRear;
+ ssize_t filled = rear - mRsmpInFront;
+ ALOG_ASSERT(0 <= filled && (size_t) filled <= mRsmpInFramesP2);
+ // exit once there is enough data in buffer for resampler
+ if ((size_t) filled >= mRsmpInFrames) {
+ break;
+ }
+ size_t avail = mRsmpInFramesP2 - filled;
+ // Only try to read full HAL buffers.
+ // But if the HAL read returns a partial buffer, use it.
+ if (avail < mFrameCount) {
+ ALOGE("insufficient space to read: avail %d < mFrameCount %d",
+ avail, mFrameCount);
+ break;
+ }
+ // If 'avail' is non-contiguous, first read past the nominal end of buffer, then
+ // copy to the right place. Permitted because mRsmpInBuffer was over-allocated.
+ rear &= mRsmpInFramesP2 - 1;
+ mBytesRead = mInput->stream->read(mInput->stream,
+ &mRsmpInBuffer[rear * mChannelCount], mBufferSize);
+ if (mBytesRead <= 0) {
+ ALOGE("read failed: mBytesRead=%d < %u", mBytesRead, mBufferSize);
+ break;
+ }
+ ALOG_ASSERT((size_t) mBytesRead <= mBufferSize);
+ size_t framesRead = mBytesRead / mFrameSize;
+ ALOG_ASSERT(framesRead > 0);
+ madeProgress = true;
+ // If 'avail' was non-contiguous, we now correct for reading past end of buffer.
+ size_t part1 = mRsmpInFramesP2 - rear;
+ if (framesRead > part1) {
+ memcpy(mRsmpInBuffer, &mRsmpInBuffer[mRsmpInFramesP2 * mChannelCount],
+ (framesRead - part1) * mFrameSize);
+ }
+ mRsmpInRear += framesRead;
+ }
+
+ if (!madeProgress) {
+ ALOGV("Did not make progress");
+ usleep(((mFrameCount * 1000) / mSampleRate) * 1000);
+ }
+
// resampler accumulates, but we only have one source track
memset(mRsmpOutBuffer, 0, framesOut * FCC_2 * sizeof(int32_t));
- // alter output frame count as if we were expecting stereo samples
- if (mChannelCount == 1 && mReqChannelCount == 1) {
- framesOut >>= 1;
- }
mResampler->resample(mRsmpOutBuffer, framesOut,
this /* AudioBufferProvider* */);
// ditherAndClamp() works as long as all buffers returned by
// activeTrack->getNextBuffer() are 32 bit aligned which should be always true.
- if (mChannelCount == 2 && mReqChannelCount == 1) {
+ if (mReqChannelCount == 1) {
// temporarily type pun mRsmpOutBuffer from Q19.12 to int16_t
ditherAndClamp(mRsmpOutBuffer, mRsmpOutBuffer, framesOut);
// the resampler always outputs stereo samples:
@@ -4836,7 +4881,11 @@ status_t AudioFlinger::RecordThread::start(RecordThread::RecordTrack* recordTrac
clearSyncStartEvent();
return status;
}
+ // FIXME LEGACY
mRsmpInIndex = mFrameCount;
+ mRsmpInFront = 0;
+ mRsmpInRear = 0;
+ mRsmpInUnrel = 0;
mBytesRead = 0;
if (mResampler != NULL) {
mResampler->reset();
@@ -5034,47 +5083,47 @@ void AudioFlinger::RecordThread::dumpTracks(int fd, const Vector<String16>& args
// AudioBufferProvider interface
status_t AudioFlinger::RecordThread::getNextBuffer(AudioBufferProvider::Buffer* buffer, int64_t pts)
{
- size_t framesReq = buffer->frameCount;
- size_t framesReady = mFrameCount - mRsmpInIndex;
- int channelCount;
-
- if (framesReady == 0) {
- mBytesRead = mInput->stream->read(mInput->stream, mRsmpInBuffer, mBufferSize);
- if (mBytesRead <= 0) {
- if ((mBytesRead < 0) && (mActiveTrack->mState == TrackBase::ACTIVE)) {
- ALOGE("RecordThread::getNextBuffer() Error reading audio input");
- // Force input into standby so that it tries to
- // recover at next read attempt
- inputStandBy();
- // FIXME an awkward place to sleep, consider using doSleep when this is pulled up
- usleep(kRecordThreadSleepUs);
- }
- buffer->raw = NULL;
- buffer->frameCount = 0;
- return NOT_ENOUGH_DATA;
- }
- mRsmpInIndex = 0;
- framesReady = mFrameCount;
- }
-
- if (framesReq > framesReady) {
- framesReq = framesReady;
- }
-
- if (mChannelCount == 1 && mReqChannelCount == 2) {
- channelCount = 1;
- } else {
- channelCount = 2;
- }
- buffer->raw = mRsmpInBuffer + mRsmpInIndex * channelCount;
- buffer->frameCount = framesReq;
+ int32_t rear = mRsmpInRear;
+ int32_t front = mRsmpInFront;
+ ssize_t filled = rear - front;
+ ALOG_ASSERT(0 <= filled && (size_t) filled <= mRsmpInFramesP2);
+ // 'filled' may be non-contiguous, so return only the first contiguous chunk
+ front &= mRsmpInFramesP2 - 1;
+ size_t part1 = mRsmpInFramesP2 - front;
+ if (part1 > (size_t) filled) {
+ part1 = filled;
+ }
+ size_t ask = buffer->frameCount;
+ ALOG_ASSERT(ask > 0);
+ if (part1 > ask) {
+ part1 = ask;
+ }
+ if (part1 == 0) {
+ // Higher-level should keep mRsmpInBuffer full, and not call resampler if empty
+ ALOGE("RecordThread::getNextBuffer() starved");
+ buffer->raw = NULL;
+ buffer->frameCount = 0;
+ mRsmpInUnrel = 0;
+ return NOT_ENOUGH_DATA;
+ }
+
+ buffer->raw = mRsmpInBuffer + front * mChannelCount;
+ buffer->frameCount = part1;
+ mRsmpInUnrel = part1;
return NO_ERROR;
}
// AudioBufferProvider interface
void AudioFlinger::RecordThread::releaseBuffer(AudioBufferProvider::Buffer* buffer)
{
- mRsmpInIndex += buffer->frameCount;
+ size_t stepCount = buffer->frameCount;
+ if (stepCount == 0) {
+ return;
+ }
+ ALOG_ASSERT(stepCount <= mRsmpInUnrel);
+ mRsmpInUnrel -= stepCount;
+ mRsmpInFront += stepCount;
+ buffer->raw = NULL;
buffer->frameCount = 0;
}
@@ -5252,28 +5301,22 @@ void AudioFlinger::RecordThread::readInputParameters()
mFrameSize = audio_stream_frame_size(&mInput->stream->common);
mBufferSize = mInput->stream->common.get_buffer_size(&mInput->stream->common);
mFrameCount = mBufferSize / mFrameSize;
- mRsmpInBuffer = new int16_t[mFrameCount * mChannelCount];
+ // With 3 HAL buffers, we can guarantee ability to down-sample the input by ratio of 2:1 to
+ // 1 full output buffer, regardless of the alignment of the available input.
+ mRsmpInFrames = mFrameCount * 3;
+ mRsmpInFramesP2 = roundup(mRsmpInFrames);
+ // Over-allocate beyond mRsmpInFramesP2 to permit a HAL read past end of buffer
+ mRsmpInBuffer = new int16_t[(mRsmpInFramesP2 + mFrameCount - 1) * mChannelCount];
+ mRsmpInFront = 0;
+ mRsmpInRear = 0;
+ mRsmpInUnrel = 0;
if (mSampleRate != mReqSampleRate && mChannelCount <= FCC_2 && mReqChannelCount <= FCC_2) {
- uint32_t channelCount;
- // optimization: if mono to mono, use the resampler in stereo to stereo mode to avoid
- // stereo to mono post process as the resampler always outputs stereo.
- if (mChannelCount == 1 && mReqChannelCount == 2) {
- channelCount = 1;
- } else {
- channelCount = 2;
- }
mResampler = AudioResampler::create(16, (int) channelCount, mReqSampleRate);
mResampler->setSampleRate(mSampleRate);
mResampler->setVolume(AudioMixer::UNITY_GAIN, AudioMixer::UNITY_GAIN);
+ // resampler always outputs stereo
mRsmpOutBuffer = new int32_t[mFrameCount * FCC_2];
-
- // optmization: if mono to mono, alter input frame count as if we were inputing
- // stereo samples
- if (mChannelCount == 1 && mReqChannelCount == 1) {
- mFrameCount >>= 1;
- }
-
}
mRsmpInIndex = mFrameCount;
}
diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index cbc3827..43e335d 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -947,10 +947,22 @@ private:
AudioResampler *mResampler;
// interleaved stereo pairs of fixed-point signed Q19.12
int32_t *mRsmpOutBuffer;
- int16_t *mRsmpInBuffer; // [mFrameCount * mChannelCount]
- size_t mRsmpInIndex;
+
+ // resampler converts input at HAL Hz to output at AudioRecord client Hz
+ int16_t *mRsmpInBuffer; // see new[] for details on the size
+ size_t mRsmpInFrames; // size of resampler input in frames
+ size_t mRsmpInFramesP2;// size rounded up to a power-of-2
+ size_t mRsmpInUnrel; // unreleased frames remaining from
+ // most recent getNextBuffer
+ // these are rolling counters that are never cleared
+ int32_t mRsmpInFront; // next available frame
+ int32_t mRsmpInRear; // last filled frame + 1
+ size_t mRsmpInIndex; // FIXME legacy
+
+ // client's requested configuration, which may differ from the HAL configuration
const uint32_t mReqChannelCount;
const uint32_t mReqSampleRate;
+
ssize_t mBytesRead;
// sync event triggering actual audio capture. Frames read before this event will
// be dropped and therefore not read by the application.
generated by cgit v1.1 at 2024-06-10 11:29:07 +0000