/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "AudioTrackShared"
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//#define LOG_NDEBUG 0
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#include <android-base/macros.h>
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#include <private/media/AudioTrackShared.h>
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#include <utils/Log.h>
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#include <audio_utils/safe_math.h>
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#include <linux/futex.h>
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#include <sys/syscall.h>
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namespace android {
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// used to clamp a value to size_t. TODO: move to another file.
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template <typename T>
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size_t clampToSize(T x) {
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return sizeof(T) > sizeof(size_t) && x > (T) SIZE_MAX ? SIZE_MAX : x < 0 ? 0 : (size_t) x;
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}
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// incrementSequence is used to determine the next sequence value
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// for the loop and position sequence counters. It should return
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// a value between "other" + 1 and "other" + INT32_MAX, the choice of
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// which needs to be the "least recently used" sequence value for "self".
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// In general, this means (new_self) returned is max(self, other) + 1.
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__attribute__((no_sanitize("integer")))
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static uint32_t incrementSequence(uint32_t self, uint32_t other) {
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int32_t diff = (int32_t) self - (int32_t) other;
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if (diff >= 0 && diff < INT32_MAX) {
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return self + 1; // we're already ahead of other.
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}
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return other + 1; // we're behind, so move just ahead of other.
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}
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audio_track_cblk_t::audio_track_cblk_t()
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: mServer(0), mFutex(0), mMinimum(0)
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, mVolumeLR(GAIN_MINIFLOAT_PACKED_UNITY), mSampleRate(0), mSendLevel(0)
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, mBufferSizeInFrames(0)
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, mFlags(0)
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{
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memset(&u, 0, sizeof(u));
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}
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// ---------------------------------------------------------------------------
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Proxy::Proxy(audio_track_cblk_t* cblk, void *buffers, size_t frameCount, size_t frameSize,
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bool isOut, bool clientInServer)
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: mCblk(cblk), mBuffers(buffers), mFrameCount(frameCount), mFrameSize(frameSize),
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mFrameCountP2(roundup(frameCount)), mIsOut(isOut), mClientInServer(clientInServer),
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mIsShutdown(false), mUnreleased(0)
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{
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}
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// ---------------------------------------------------------------------------
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ClientProxy::ClientProxy(audio_track_cblk_t* cblk, void *buffers, size_t frameCount,
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size_t frameSize, bool isOut, bool clientInServer)
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: Proxy(cblk, buffers, frameCount, frameSize, isOut, clientInServer)
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, mEpoch(0)
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, mTimestampObserver(&cblk->mExtendedTimestampQueue)
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{
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setBufferSizeInFrames(frameCount);
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}
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const struct timespec ClientProxy::kForever = {INT_MAX /*tv_sec*/, 0 /*tv_nsec*/};
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const struct timespec ClientProxy::kNonBlocking = {0 /*tv_sec*/, 0 /*tv_nsec*/};
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#define MEASURE_NS 10000000 // attempt to provide accurate timeouts if requested >= MEASURE_NS
|
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// To facilitate quicker recovery from server failure, this value limits the timeout per each futex
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// wait. However it does not protect infinite timeouts. If defined to be zero, there is no limit.
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// FIXME May not be compatible with audio tunneling requirements where timeout should be in the
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// order of minutes.
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#define MAX_SEC 5
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uint32_t ClientProxy::setBufferSizeInFrames(uint32_t size)
|
{
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// The minimum should be greater than zero and less than the size
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// at which underruns will occur.
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const uint32_t minimum = 16; // based on AudioMixer::BLOCKSIZE
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const uint32_t maximum = frameCount();
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uint32_t clippedSize = size;
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if (maximum < minimum) {
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clippedSize = maximum;
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} else if (clippedSize < minimum) {
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clippedSize = minimum;
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} else if (clippedSize > maximum) {
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clippedSize = maximum;
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}
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// for server to read
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android_atomic_release_store(clippedSize, (int32_t *)&mCblk->mBufferSizeInFrames);
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// for client to read
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mBufferSizeInFrames = clippedSize;
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return clippedSize;
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}
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__attribute__((no_sanitize("integer")))
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status_t ClientProxy::obtainBuffer(Buffer* buffer, const struct timespec *requested,
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struct timespec *elapsed)
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{
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LOG_ALWAYS_FATAL_IF(buffer == NULL || buffer->mFrameCount == 0,
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"%s: null or zero frame buffer, buffer:%p", __func__, buffer);
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struct timespec total; // total elapsed time spent waiting
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total.tv_sec = 0;
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total.tv_nsec = 0;
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bool measure = elapsed != NULL; // whether to measure total elapsed time spent waiting
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status_t status;
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enum {
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TIMEOUT_ZERO, // requested == NULL || *requested == 0
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TIMEOUT_INFINITE, // *requested == infinity
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TIMEOUT_FINITE, // 0 < *requested < infinity
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TIMEOUT_CONTINUE, // additional chances after TIMEOUT_FINITE
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} timeout;
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if (requested == NULL) {
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timeout = TIMEOUT_ZERO;
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} else if (requested->tv_sec == 0 && requested->tv_nsec == 0) {
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timeout = TIMEOUT_ZERO;
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} else if (requested->tv_sec == INT_MAX) {
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timeout = TIMEOUT_INFINITE;
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} else {
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timeout = TIMEOUT_FINITE;
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if (requested->tv_sec > 0 || requested->tv_nsec >= MEASURE_NS) {
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measure = true;
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}
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}
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struct timespec before;
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bool beforeIsValid = false;
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audio_track_cblk_t* cblk = mCblk;
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bool ignoreInitialPendingInterrupt = true;
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// check for shared memory corruption
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if (mIsShutdown) {
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status = NO_INIT;
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goto end;
|
}
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for (;;) {
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int32_t flags = android_atomic_and(~CBLK_INTERRUPT, &cblk->mFlags);
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// check for track invalidation by server, or server death detection
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if (flags & CBLK_INVALID) {
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ALOGV("Track invalidated");
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status = DEAD_OBJECT;
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goto end;
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}
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if (flags & CBLK_DISABLED) {
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ALOGV("Track disabled");
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status = NOT_ENOUGH_DATA;
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goto end;
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}
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// check for obtainBuffer interrupted by client
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if (!ignoreInitialPendingInterrupt && (flags & CBLK_INTERRUPT)) {
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ALOGV("obtainBuffer() interrupted by client");
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status = -EINTR;
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goto end;
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}
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ignoreInitialPendingInterrupt = false;
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// compute number of frames available to write (AudioTrack) or read (AudioRecord)
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int32_t front;
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int32_t rear;
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if (mIsOut) {
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// The barrier following the read of mFront is probably redundant.
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// We're about to perform a conditional branch based on 'filled',
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// which will force the processor to observe the read of mFront
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// prior to allowing data writes starting at mRaw.
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// However, the processor may support speculative execution,
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// and be unable to undo speculative writes into shared memory.
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// The barrier will prevent such speculative execution.
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front = android_atomic_acquire_load(&cblk->u.mStreaming.mFront);
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rear = cblk->u.mStreaming.mRear;
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} else {
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// On the other hand, this barrier is required.
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rear = android_atomic_acquire_load(&cblk->u.mStreaming.mRear);
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front = cblk->u.mStreaming.mFront;
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}
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// write to rear, read from front
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ssize_t filled = audio_utils::safe_sub_overflow(rear, front);
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// pipe should not be overfull
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if (!(0 <= filled && (size_t) filled <= mFrameCount)) {
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if (mIsOut) {
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ALOGE("Shared memory control block is corrupt (filled=%zd, mFrameCount=%zu); "
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"shutting down", filled, mFrameCount);
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mIsShutdown = true;
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status = NO_INIT;
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goto end;
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}
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// for input, sync up on overrun
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filled = 0;
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cblk->u.mStreaming.mFront = rear;
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(void) android_atomic_or(CBLK_OVERRUN, &cblk->mFlags);
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}
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// Don't allow filling pipe beyond the user settable size.
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// The calculation for avail can go negative if the buffer size
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// is suddenly dropped below the amount already in the buffer.
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// So use a signed calculation to prevent a numeric overflow abort.
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ssize_t adjustableSize = (ssize_t) getBufferSizeInFrames();
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ssize_t avail = (mIsOut) ? adjustableSize - filled : filled;
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if (avail < 0) {
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avail = 0;
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} else if (avail > 0) {
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// 'avail' may be non-contiguous, so return only the first contiguous chunk
|
size_t part1;
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if (mIsOut) {
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rear &= mFrameCountP2 - 1;
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part1 = mFrameCountP2 - rear;
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} else {
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front &= mFrameCountP2 - 1;
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part1 = mFrameCountP2 - front;
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}
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if (part1 > (size_t)avail) {
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part1 = avail;
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}
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if (part1 > buffer->mFrameCount) {
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part1 = buffer->mFrameCount;
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}
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buffer->mFrameCount = part1;
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buffer->mRaw = part1 > 0 ?
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&((char *) mBuffers)[(mIsOut ? rear : front) * mFrameSize] : NULL;
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buffer->mNonContig = avail - part1;
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mUnreleased = part1;
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status = NO_ERROR;
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break;
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}
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struct timespec remaining;
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const struct timespec *ts;
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switch (timeout) {
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case TIMEOUT_ZERO:
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status = WOULD_BLOCK;
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goto end;
|
case TIMEOUT_INFINITE:
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ts = NULL;
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break;
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case TIMEOUT_FINITE:
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timeout = TIMEOUT_CONTINUE;
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if (MAX_SEC == 0) {
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ts = requested;
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break;
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}
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FALLTHROUGH_INTENDED;
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case TIMEOUT_CONTINUE:
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// FIXME we do not retry if requested < 10ms? needs documentation on this state machine
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if (!measure || requested->tv_sec < total.tv_sec ||
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(requested->tv_sec == total.tv_sec && requested->tv_nsec <= total.tv_nsec)) {
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status = TIMED_OUT;
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goto end;
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}
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remaining.tv_sec = requested->tv_sec - total.tv_sec;
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if ((remaining.tv_nsec = requested->tv_nsec - total.tv_nsec) < 0) {
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remaining.tv_nsec += 1000000000;
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remaining.tv_sec++;
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}
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if (0 < MAX_SEC && MAX_SEC < remaining.tv_sec) {
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remaining.tv_sec = MAX_SEC;
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remaining.tv_nsec = 0;
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}
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ts = &remaining;
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break;
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default:
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LOG_ALWAYS_FATAL("obtainBuffer() timeout=%d", timeout);
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ts = NULL;
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break;
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}
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int32_t old = android_atomic_and(~CBLK_FUTEX_WAKE, &cblk->mFutex);
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if (!(old & CBLK_FUTEX_WAKE)) {
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if (measure && !beforeIsValid) {
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clock_gettime(CLOCK_MONOTONIC, &before);
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beforeIsValid = true;
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}
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errno = 0;
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(void) syscall(__NR_futex, &cblk->mFutex,
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mClientInServer ? FUTEX_WAIT_PRIVATE : FUTEX_WAIT, old & ~CBLK_FUTEX_WAKE, ts);
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status_t error = errno; // clock_gettime can affect errno
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// update total elapsed time spent waiting
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if (measure) {
|
struct timespec after;
|
clock_gettime(CLOCK_MONOTONIC, &after);
|
total.tv_sec += after.tv_sec - before.tv_sec;
|
// Use auto instead of long to avoid the google-runtime-int warning.
|
auto deltaNs = after.tv_nsec - before.tv_nsec;
|
if (deltaNs < 0) {
|
deltaNs += 1000000000;
|
total.tv_sec--;
|
}
|
if ((total.tv_nsec += deltaNs) >= 1000000000) {
|
total.tv_nsec -= 1000000000;
|
total.tv_sec++;
|
}
|
before = after;
|
beforeIsValid = true;
|
}
|
switch (error) {
|
case 0: // normal wakeup by server, or by binderDied()
|
case EWOULDBLOCK: // benign race condition with server
|
case EINTR: // wait was interrupted by signal or other spurious wakeup
|
case ETIMEDOUT: // time-out expired
|
// FIXME these error/non-0 status are being dropped
|
break;
|
default:
|
status = error;
|
ALOGE("%s unexpected error %s", __func__, strerror(status));
|
goto end;
|
}
|
}
|
}
|
|
end:
|
if (status != NO_ERROR) {
|
buffer->mFrameCount = 0;
|
buffer->mRaw = NULL;
|
buffer->mNonContig = 0;
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mUnreleased = 0;
|
}
|
if (elapsed != NULL) {
|
*elapsed = total;
|
}
|
if (requested == NULL) {
|
requested = &kNonBlocking;
|
}
|
if (measure) {
|
ALOGV("requested %ld.%03ld elapsed %ld.%03ld",
|
requested->tv_sec, requested->tv_nsec / 1000000,
|
total.tv_sec, total.tv_nsec / 1000000);
|
}
|
return status;
|
}
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__attribute__((no_sanitize("integer")))
|
void ClientProxy::releaseBuffer(Buffer* buffer)
|
{
|
LOG_ALWAYS_FATAL_IF(buffer == NULL);
|
size_t stepCount = buffer->mFrameCount;
|
if (stepCount == 0 || mIsShutdown) {
|
// prevent accidental re-use of buffer
|
buffer->mFrameCount = 0;
|
buffer->mRaw = NULL;
|
buffer->mNonContig = 0;
|
return;
|
}
|
LOG_ALWAYS_FATAL_IF(!(stepCount <= mUnreleased && mUnreleased <= mFrameCount),
|
"%s: mUnreleased out of range, "
|
"!(stepCount:%zu <= mUnreleased:%zu <= mFrameCount:%zu), BufferSizeInFrames:%u",
|
__func__, stepCount, mUnreleased, mFrameCount, getBufferSizeInFrames());
|
mUnreleased -= stepCount;
|
audio_track_cblk_t* cblk = mCblk;
|
// Both of these barriers are required
|
if (mIsOut) {
|
int32_t rear = cblk->u.mStreaming.mRear;
|
android_atomic_release_store(stepCount + rear, &cblk->u.mStreaming.mRear);
|
} else {
|
int32_t front = cblk->u.mStreaming.mFront;
|
android_atomic_release_store(stepCount + front, &cblk->u.mStreaming.mFront);
|
}
|
}
|
|
void ClientProxy::binderDied()
|
{
|
audio_track_cblk_t* cblk = mCblk;
|
if (!(android_atomic_or(CBLK_INVALID, &cblk->mFlags) & CBLK_INVALID)) {
|
android_atomic_or(CBLK_FUTEX_WAKE, &cblk->mFutex);
|
// it seems that a FUTEX_WAKE_PRIVATE will not wake a FUTEX_WAIT, even within same process
|
(void) syscall(__NR_futex, &cblk->mFutex, mClientInServer ? FUTEX_WAKE_PRIVATE : FUTEX_WAKE,
|
1);
|
}
|
}
|
|
void ClientProxy::interrupt()
|
{
|
audio_track_cblk_t* cblk = mCblk;
|
if (!(android_atomic_or(CBLK_INTERRUPT, &cblk->mFlags) & CBLK_INTERRUPT)) {
|
android_atomic_or(CBLK_FUTEX_WAKE, &cblk->mFutex);
|
(void) syscall(__NR_futex, &cblk->mFutex, mClientInServer ? FUTEX_WAKE_PRIVATE : FUTEX_WAKE,
|
1);
|
}
|
}
|
|
__attribute__((no_sanitize("integer")))
|
size_t ClientProxy::getMisalignment()
|
{
|
audio_track_cblk_t* cblk = mCblk;
|
return (mFrameCountP2 - (mIsOut ? cblk->u.mStreaming.mRear : cblk->u.mStreaming.mFront)) &
|
(mFrameCountP2 - 1);
|
}
|
|
// ---------------------------------------------------------------------------
|
|
void AudioTrackClientProxy::flush()
|
{
|
sendStreamingFlushStop(true /* flush */);
|
}
|
|
void AudioTrackClientProxy::stop()
|
{
|
sendStreamingFlushStop(false /* flush */);
|
}
|
|
// Sets the client-written mFlush and mStop positions, which control server behavior.
|
//
|
// @param flush indicates whether the operation is a flush or stop.
|
// A client stop sets mStop to the current write position;
|
// the server will not read past this point until start() or subsequent flush().
|
// A client flush sets both mStop and mFlush to the current write position.
|
// This advances the server read limit (if previously set) and on the next
|
// server read advances the server read position to this limit.
|
//
|
void AudioTrackClientProxy::sendStreamingFlushStop(bool flush)
|
{
|
// TODO: Replace this by 64 bit counters - avoids wrap complication.
|
// This works for mFrameCountP2 <= 2^30
|
// mFlush is 32 bits concatenated as [ flush_counter ] [ newfront_offset ]
|
// Should newFlush = cblk->u.mStreaming.mRear? Only problem is
|
// if you want to flush twice to the same rear location after a 32 bit wrap.
|
|
const size_t increment = mFrameCountP2 << 1;
|
const size_t mask = increment - 1;
|
// No need for client atomic synchronization on mRear, mStop, mFlush
|
// as AudioTrack client only read/writes to them under client lock. Server only reads.
|
const int32_t rearMasked = mCblk->u.mStreaming.mRear & mask;
|
|
// update stop before flush so that the server front
|
// never advances beyond a (potential) previous stop's rear limit.
|
int32_t stopBits; // the following add can overflow
|
__builtin_add_overflow(mCblk->u.mStreaming.mStop & ~mask, increment, &stopBits);
|
android_atomic_release_store(rearMasked | stopBits, &mCblk->u.mStreaming.mStop);
|
|
if (flush) {
|
int32_t flushBits; // the following add can overflow
|
__builtin_add_overflow(mCblk->u.mStreaming.mFlush & ~mask, increment, &flushBits);
|
android_atomic_release_store(rearMasked | flushBits, &mCblk->u.mStreaming.mFlush);
|
}
|
}
|
|
bool AudioTrackClientProxy::clearStreamEndDone() {
|
return (android_atomic_and(~CBLK_STREAM_END_DONE, &mCblk->mFlags) & CBLK_STREAM_END_DONE) != 0;
|
}
|
|
bool AudioTrackClientProxy::getStreamEndDone() const {
|
return (mCblk->mFlags & CBLK_STREAM_END_DONE) != 0;
|
}
|
|
status_t AudioTrackClientProxy::waitStreamEndDone(const struct timespec *requested)
|
{
|
struct timespec total; // total elapsed time spent waiting
|
total.tv_sec = 0;
|
total.tv_nsec = 0;
|
audio_track_cblk_t* cblk = mCblk;
|
status_t status;
|
enum {
|
TIMEOUT_ZERO, // requested == NULL || *requested == 0
|
TIMEOUT_INFINITE, // *requested == infinity
|
TIMEOUT_FINITE, // 0 < *requested < infinity
|
TIMEOUT_CONTINUE, // additional chances after TIMEOUT_FINITE
|
} timeout;
|
if (requested == NULL) {
|
timeout = TIMEOUT_ZERO;
|
} else if (requested->tv_sec == 0 && requested->tv_nsec == 0) {
|
timeout = TIMEOUT_ZERO;
|
} else if (requested->tv_sec == INT_MAX) {
|
timeout = TIMEOUT_INFINITE;
|
} else {
|
timeout = TIMEOUT_FINITE;
|
}
|
for (;;) {
|
int32_t flags = android_atomic_and(~(CBLK_INTERRUPT|CBLK_STREAM_END_DONE), &cblk->mFlags);
|
// check for track invalidation by server, or server death detection
|
if (flags & CBLK_INVALID) {
|
ALOGV("Track invalidated");
|
status = DEAD_OBJECT;
|
goto end;
|
}
|
// a track is not supposed to underrun at this stage but consider it done
|
if (flags & (CBLK_STREAM_END_DONE | CBLK_DISABLED)) {
|
ALOGV("stream end received");
|
status = NO_ERROR;
|
goto end;
|
}
|
// check for obtainBuffer interrupted by client
|
if (flags & CBLK_INTERRUPT) {
|
ALOGV("waitStreamEndDone() interrupted by client");
|
status = -EINTR;
|
goto end;
|
}
|
struct timespec remaining;
|
const struct timespec *ts;
|
switch (timeout) {
|
case TIMEOUT_ZERO:
|
status = WOULD_BLOCK;
|
goto end;
|
case TIMEOUT_INFINITE:
|
ts = NULL;
|
break;
|
case TIMEOUT_FINITE:
|
timeout = TIMEOUT_CONTINUE;
|
if (MAX_SEC == 0) {
|
ts = requested;
|
break;
|
}
|
FALLTHROUGH_INTENDED;
|
case TIMEOUT_CONTINUE:
|
// FIXME we do not retry if requested < 10ms? needs documentation on this state machine
|
if (requested->tv_sec < total.tv_sec ||
|
(requested->tv_sec == total.tv_sec && requested->tv_nsec <= total.tv_nsec)) {
|
status = TIMED_OUT;
|
goto end;
|
}
|
remaining.tv_sec = requested->tv_sec - total.tv_sec;
|
if ((remaining.tv_nsec = requested->tv_nsec - total.tv_nsec) < 0) {
|
remaining.tv_nsec += 1000000000;
|
remaining.tv_sec++;
|
}
|
if (0 < MAX_SEC && MAX_SEC < remaining.tv_sec) {
|
remaining.tv_sec = MAX_SEC;
|
remaining.tv_nsec = 0;
|
}
|
ts = &remaining;
|
break;
|
default:
|
LOG_ALWAYS_FATAL("waitStreamEndDone() timeout=%d", timeout);
|
ts = NULL;
|
break;
|
}
|
int32_t old = android_atomic_and(~CBLK_FUTEX_WAKE, &cblk->mFutex);
|
if (!(old & CBLK_FUTEX_WAKE)) {
|
errno = 0;
|
(void) syscall(__NR_futex, &cblk->mFutex,
|
mClientInServer ? FUTEX_WAIT_PRIVATE : FUTEX_WAIT, old & ~CBLK_FUTEX_WAKE, ts);
|
switch (errno) {
|
case 0: // normal wakeup by server, or by binderDied()
|
case EWOULDBLOCK: // benign race condition with server
|
case EINTR: // wait was interrupted by signal or other spurious wakeup
|
case ETIMEDOUT: // time-out expired
|
break;
|
default:
|
status = errno;
|
ALOGE("%s unexpected error %s", __func__, strerror(status));
|
goto end;
|
}
|
}
|
}
|
|
end:
|
if (requested == NULL) {
|
requested = &kNonBlocking;
|
}
|
return status;
|
}
|
|
// ---------------------------------------------------------------------------
|
|
StaticAudioTrackClientProxy::StaticAudioTrackClientProxy(audio_track_cblk_t* cblk, void *buffers,
|
size_t frameCount, size_t frameSize)
|
: AudioTrackClientProxy(cblk, buffers, frameCount, frameSize),
|
mMutator(&cblk->u.mStatic.mSingleStateQueue),
|
mPosLoopObserver(&cblk->u.mStatic.mPosLoopQueue)
|
{
|
memset(&mState, 0, sizeof(mState));
|
memset(&mPosLoop, 0, sizeof(mPosLoop));
|
}
|
|
void StaticAudioTrackClientProxy::flush()
|
{
|
LOG_ALWAYS_FATAL("static flush");
|
}
|
|
void StaticAudioTrackClientProxy::stop()
|
{
|
; // no special handling required for static tracks.
|
}
|
|
void StaticAudioTrackClientProxy::setLoop(size_t loopStart, size_t loopEnd, int loopCount)
|
{
|
// This can only happen on a 64-bit client
|
if (loopStart > UINT32_MAX || loopEnd > UINT32_MAX) {
|
// FIXME Should return an error status
|
return;
|
}
|
mState.mLoopStart = (uint32_t) loopStart;
|
mState.mLoopEnd = (uint32_t) loopEnd;
|
mState.mLoopCount = loopCount;
|
mState.mLoopSequence = incrementSequence(mState.mLoopSequence, mState.mPositionSequence);
|
// set patch-up variables until the mState is acknowledged by the ServerProxy.
|
// observed buffer position and loop count will freeze until then to give the
|
// illusion of a synchronous change.
|
getBufferPositionAndLoopCount(NULL, NULL);
|
// preserve behavior to restart at mState.mLoopStart if position exceeds mState.mLoopEnd.
|
if (mState.mLoopCount != 0 && mPosLoop.mBufferPosition >= mState.mLoopEnd) {
|
mPosLoop.mBufferPosition = mState.mLoopStart;
|
}
|
mPosLoop.mLoopCount = mState.mLoopCount;
|
(void) mMutator.push(mState);
|
}
|
|
void StaticAudioTrackClientProxy::setBufferPosition(size_t position)
|
{
|
// This can only happen on a 64-bit client
|
if (position > UINT32_MAX) {
|
// FIXME Should return an error status
|
return;
|
}
|
mState.mPosition = (uint32_t) position;
|
mState.mPositionSequence = incrementSequence(mState.mPositionSequence, mState.mLoopSequence);
|
// set patch-up variables until the mState is acknowledged by the ServerProxy.
|
// observed buffer position and loop count will freeze until then to give the
|
// illusion of a synchronous change.
|
if (mState.mLoopCount > 0) { // only check if loop count is changing
|
getBufferPositionAndLoopCount(NULL, NULL); // get last position
|
}
|
mPosLoop.mBufferPosition = position;
|
if (position >= mState.mLoopEnd) {
|
// no ongoing loop is possible if position is greater than loopEnd.
|
mPosLoop.mLoopCount = 0;
|
}
|
(void) mMutator.push(mState);
|
}
|
|
void StaticAudioTrackClientProxy::setBufferPositionAndLoop(size_t position, size_t loopStart,
|
size_t loopEnd, int loopCount)
|
{
|
setLoop(loopStart, loopEnd, loopCount);
|
setBufferPosition(position);
|
}
|
|
size_t StaticAudioTrackClientProxy::getBufferPosition()
|
{
|
getBufferPositionAndLoopCount(NULL, NULL);
|
return mPosLoop.mBufferPosition;
|
}
|
|
void StaticAudioTrackClientProxy::getBufferPositionAndLoopCount(
|
size_t *position, int *loopCount)
|
{
|
if (mMutator.ack() == StaticAudioTrackSingleStateQueue::SSQ_DONE) {
|
if (mPosLoopObserver.poll(mPosLoop)) {
|
; // a valid mPosLoop should be available if ackDone is true.
|
}
|
}
|
if (position != NULL) {
|
*position = mPosLoop.mBufferPosition;
|
}
|
if (loopCount != NULL) {
|
*loopCount = mPosLoop.mLoopCount;
|
}
|
}
|
|
// ---------------------------------------------------------------------------
|
|
ServerProxy::ServerProxy(audio_track_cblk_t* cblk, void *buffers, size_t frameCount,
|
size_t frameSize, bool isOut, bool clientInServer)
|
: Proxy(cblk, buffers, frameCount, frameSize, isOut, clientInServer),
|
mAvailToClient(0), mFlush(0), mReleased(0), mFlushed(0)
|
, mTimestampMutator(&cblk->mExtendedTimestampQueue)
|
{
|
cblk->mBufferSizeInFrames = frameCount;
|
}
|
|
__attribute__((no_sanitize("integer")))
|
void ServerProxy::flushBufferIfNeeded()
|
{
|
audio_track_cblk_t* cblk = mCblk;
|
// The acquire_load is not really required. But since the write is a release_store in the
|
// client, using acquire_load here makes it easier for people to maintain the code,
|
// and the logic for communicating ipc variables seems somewhat standard,
|
// and there really isn't much penalty for 4 or 8 byte atomics.
|
int32_t flush = android_atomic_acquire_load(&cblk->u.mStreaming.mFlush);
|
if (flush != mFlush) {
|
ALOGV("ServerProxy::flushBufferIfNeeded() mStreaming.mFlush = 0x%x, mFlush = 0x%0x",
|
flush, mFlush);
|
// shouldn't matter, but for range safety use mRear instead of getRear().
|
int32_t rear = android_atomic_acquire_load(&cblk->u.mStreaming.mRear);
|
int32_t front = cblk->u.mStreaming.mFront;
|
|
// effectively obtain then release whatever is in the buffer
|
const size_t overflowBit = mFrameCountP2 << 1;
|
const size_t mask = overflowBit - 1;
|
int32_t newFront = (front & ~mask) | (flush & mask);
|
ssize_t filled = audio_utils::safe_sub_overflow(rear, newFront);
|
if (filled >= (ssize_t)overflowBit) {
|
// front and rear offsets span the overflow bit of the p2 mask
|
// so rebasing newFront on the front offset is off by the overflow bit.
|
// adjust newFront to match rear offset.
|
ALOGV("flush wrap: filled %zx >= overflowBit %zx", filled, overflowBit);
|
newFront += overflowBit;
|
filled -= overflowBit;
|
}
|
// Rather than shutting down on a corrupt flush, just treat it as a full flush
|
if (!(0 <= filled && (size_t) filled <= mFrameCount)) {
|
ALOGE("mFlush %#x -> %#x, front %#x, rear %#x, mask %#x, newFront %#x, "
|
"filled %zd=%#x",
|
mFlush, flush, front, rear,
|
(unsigned)mask, newFront, filled, (unsigned)filled);
|
newFront = rear;
|
}
|
mFlush = flush;
|
android_atomic_release_store(newFront, &cblk->u.mStreaming.mFront);
|
// There is no danger from a false positive, so err on the side of caution
|
if (true /*front != newFront*/) {
|
int32_t old = android_atomic_or(CBLK_FUTEX_WAKE, &cblk->mFutex);
|
if (!(old & CBLK_FUTEX_WAKE)) {
|
(void) syscall(__NR_futex, &cblk->mFutex,
|
mClientInServer ? FUTEX_WAKE_PRIVATE : FUTEX_WAKE, 1);
|
}
|
}
|
mFlushed += (newFront - front) & mask;
|
}
|
}
|
|
__attribute__((no_sanitize("integer")))
|
int32_t AudioTrackServerProxy::getRear() const
|
{
|
const int32_t stop = android_atomic_acquire_load(&mCblk->u.mStreaming.mStop);
|
const int32_t rear = android_atomic_acquire_load(&mCblk->u.mStreaming.mRear);
|
const int32_t stopLast = mStopLast.load(std::memory_order_acquire);
|
if (stop != stopLast) {
|
const int32_t front = mCblk->u.mStreaming.mFront;
|
const size_t overflowBit = mFrameCountP2 << 1;
|
const size_t mask = overflowBit - 1;
|
int32_t newRear = (rear & ~mask) | (stop & mask);
|
ssize_t filled = audio_utils::safe_sub_overflow(newRear, front);
|
// overflowBit is unsigned, so cast to signed for comparison.
|
if (filled >= (ssize_t)overflowBit) {
|
// front and rear offsets span the overflow bit of the p2 mask
|
// so rebasing newRear on the rear offset is off by the overflow bit.
|
ALOGV("stop wrap: filled %zx >= overflowBit %zx", filled, overflowBit);
|
newRear -= overflowBit;
|
filled -= overflowBit;
|
}
|
if (0 <= filled && (size_t) filled <= mFrameCount) {
|
// we're stopped, return the stop level as newRear
|
return newRear;
|
}
|
|
// A corrupt stop. Log error and ignore.
|
ALOGE("mStopLast %#x -> stop %#x, front %#x, rear %#x, mask %#x, newRear %#x, "
|
"filled %zd=%#x",
|
stopLast, stop, front, rear,
|
(unsigned)mask, newRear, filled, (unsigned)filled);
|
// Don't reset mStopLast as this is const.
|
}
|
return rear;
|
}
|
|
void AudioTrackServerProxy::start()
|
{
|
mStopLast = android_atomic_acquire_load(&mCblk->u.mStreaming.mStop);
|
}
|
|
__attribute__((no_sanitize("integer")))
|
status_t ServerProxy::obtainBuffer(Buffer* buffer, bool ackFlush)
|
{
|
LOG_ALWAYS_FATAL_IF(buffer == NULL || buffer->mFrameCount == 0,
|
"%s: null or zero frame buffer, buffer:%p", __func__, buffer);
|
if (mIsShutdown) {
|
goto no_init;
|
}
|
{
|
audio_track_cblk_t* cblk = mCblk;
|
// compute number of frames available to write (AudioTrack) or read (AudioRecord),
|
// or use previous cached value from framesReady(), with added barrier if it omits.
|
int32_t front;
|
int32_t rear;
|
// See notes on barriers at ClientProxy::obtainBuffer()
|
if (mIsOut) {
|
flushBufferIfNeeded(); // might modify mFront
|
rear = getRear();
|
front = cblk->u.mStreaming.mFront;
|
} else {
|
front = android_atomic_acquire_load(&cblk->u.mStreaming.mFront);
|
rear = cblk->u.mStreaming.mRear;
|
}
|
ssize_t filled = audio_utils::safe_sub_overflow(rear, front);
|
// pipe should not already be overfull
|
if (!(0 <= filled && (size_t) filled <= mFrameCount)) {
|
ALOGE("Shared memory control block is corrupt (filled=%zd, mFrameCount=%zu); shutting down",
|
filled, mFrameCount);
|
mIsShutdown = true;
|
}
|
if (mIsShutdown) {
|
goto no_init;
|
}
|
// don't allow filling pipe beyond the nominal size
|
size_t availToServer;
|
if (mIsOut) {
|
availToServer = filled;
|
mAvailToClient = mFrameCount - filled;
|
} else {
|
availToServer = mFrameCount - filled;
|
mAvailToClient = filled;
|
}
|
// 'availToServer' may be non-contiguous, so return only the first contiguous chunk
|
size_t part1;
|
if (mIsOut) {
|
front &= mFrameCountP2 - 1;
|
part1 = mFrameCountP2 - front;
|
} else {
|
rear &= mFrameCountP2 - 1;
|
part1 = mFrameCountP2 - rear;
|
}
|
if (part1 > availToServer) {
|
part1 = availToServer;
|
}
|
size_t ask = buffer->mFrameCount;
|
if (part1 > ask) {
|
part1 = ask;
|
}
|
// is assignment redundant in some cases?
|
buffer->mFrameCount = part1;
|
buffer->mRaw = part1 > 0 ?
|
&((char *) mBuffers)[(mIsOut ? front : rear) * mFrameSize] : NULL;
|
buffer->mNonContig = availToServer - part1;
|
// After flush(), allow releaseBuffer() on a previously obtained buffer;
|
// see "Acknowledge any pending flush()" in audioflinger/Tracks.cpp.
|
if (!ackFlush) {
|
mUnreleased = part1;
|
}
|
return part1 > 0 ? NO_ERROR : WOULD_BLOCK;
|
}
|
no_init:
|
buffer->mFrameCount = 0;
|
buffer->mRaw = NULL;
|
buffer->mNonContig = 0;
|
mUnreleased = 0;
|
return NO_INIT;
|
}
|
|
__attribute__((no_sanitize("integer")))
|
void ServerProxy::releaseBuffer(Buffer* buffer)
|
{
|
LOG_ALWAYS_FATAL_IF(buffer == NULL);
|
size_t stepCount = buffer->mFrameCount;
|
if (stepCount == 0 || mIsShutdown) {
|
// prevent accidental re-use of buffer
|
buffer->mFrameCount = 0;
|
buffer->mRaw = NULL;
|
buffer->mNonContig = 0;
|
return;
|
}
|
LOG_ALWAYS_FATAL_IF(!(stepCount <= mUnreleased && mUnreleased <= mFrameCount),
|
"%s: mUnreleased out of range, "
|
"!(stepCount:%zu <= mUnreleased:%zu <= mFrameCount:%zu)",
|
__func__, stepCount, mUnreleased, mFrameCount);
|
mUnreleased -= stepCount;
|
audio_track_cblk_t* cblk = mCblk;
|
if (mIsOut) {
|
int32_t front = cblk->u.mStreaming.mFront;
|
android_atomic_release_store(stepCount + front, &cblk->u.mStreaming.mFront);
|
} else {
|
int32_t rear = cblk->u.mStreaming.mRear;
|
android_atomic_release_store(stepCount + rear, &cblk->u.mStreaming.mRear);
|
}
|
|
cblk->mServer += stepCount;
|
mReleased += stepCount;
|
|
size_t half = mFrameCount / 2;
|
if (half == 0) {
|
half = 1;
|
}
|
size_t minimum = (size_t) cblk->mMinimum;
|
if (minimum == 0) {
|
minimum = mIsOut ? half : 1;
|
} else if (minimum > half) {
|
minimum = half;
|
}
|
// FIXME AudioRecord wakeup needs to be optimized; it currently wakes up client every time
|
if (!mIsOut || (mAvailToClient + stepCount >= minimum)) {
|
ALOGV("mAvailToClient=%zu stepCount=%zu minimum=%zu", mAvailToClient, stepCount, minimum);
|
int32_t old = android_atomic_or(CBLK_FUTEX_WAKE, &cblk->mFutex);
|
if (!(old & CBLK_FUTEX_WAKE)) {
|
(void) syscall(__NR_futex, &cblk->mFutex,
|
mClientInServer ? FUTEX_WAKE_PRIVATE : FUTEX_WAKE, 1);
|
}
|
}
|
|
buffer->mFrameCount = 0;
|
buffer->mRaw = NULL;
|
buffer->mNonContig = 0;
|
}
|
|
// ---------------------------------------------------------------------------
|
|
__attribute__((no_sanitize("integer")))
|
size_t AudioTrackServerProxy::framesReady()
|
{
|
LOG_ALWAYS_FATAL_IF(!mIsOut);
|
|
if (mIsShutdown) {
|
return 0;
|
}
|
audio_track_cblk_t* cblk = mCblk;
|
|
int32_t flush = cblk->u.mStreaming.mFlush;
|
if (flush != mFlush) {
|
// FIXME should return an accurate value, but over-estimate is better than under-estimate
|
return mFrameCount;
|
}
|
const int32_t rear = getRear();
|
ssize_t filled = audio_utils::safe_sub_overflow(rear, cblk->u.mStreaming.mFront);
|
// pipe should not already be overfull
|
if (!(0 <= filled && (size_t) filled <= mFrameCount)) {
|
ALOGE("Shared memory control block is corrupt (filled=%zd, mFrameCount=%zu); shutting down",
|
filled, mFrameCount);
|
mIsShutdown = true;
|
return 0;
|
}
|
// cache this value for later use by obtainBuffer(), with added barrier
|
// and racy if called by normal mixer thread
|
// ignores flush(), so framesReady() may report a larger mFrameCount than obtainBuffer()
|
return filled;
|
}
|
|
__attribute__((no_sanitize("integer")))
|
size_t AudioTrackServerProxy::framesReadySafe() const
|
{
|
if (mIsShutdown) {
|
return 0;
|
}
|
const audio_track_cblk_t* cblk = mCblk;
|
const int32_t flush = android_atomic_acquire_load(&cblk->u.mStreaming.mFlush);
|
if (flush != mFlush) {
|
return mFrameCount;
|
}
|
const int32_t rear = getRear();
|
const ssize_t filled = audio_utils::safe_sub_overflow(rear, cblk->u.mStreaming.mFront);
|
if (!(0 <= filled && (size_t) filled <= mFrameCount)) {
|
return 0; // error condition, silently return 0.
|
}
|
return filled;
|
}
|
|
bool AudioTrackServerProxy::setStreamEndDone() {
|
audio_track_cblk_t* cblk = mCblk;
|
bool old =
|
(android_atomic_or(CBLK_STREAM_END_DONE, &cblk->mFlags) & CBLK_STREAM_END_DONE) != 0;
|
if (!old) {
|
(void) syscall(__NR_futex, &cblk->mFutex, mClientInServer ? FUTEX_WAKE_PRIVATE : FUTEX_WAKE,
|
1);
|
}
|
return old;
|
}
|
|
__attribute__((no_sanitize("integer")))
|
void AudioTrackServerProxy::tallyUnderrunFrames(uint32_t frameCount)
|
{
|
audio_track_cblk_t* cblk = mCblk;
|
if (frameCount > 0) {
|
cblk->u.mStreaming.mUnderrunFrames += frameCount;
|
|
if (!mUnderrunning) { // start of underrun?
|
mUnderrunCount++;
|
cblk->u.mStreaming.mUnderrunCount = mUnderrunCount;
|
mUnderrunning = true;
|
ALOGV("tallyUnderrunFrames(%3u) at uf = %u, bump mUnderrunCount = %u",
|
frameCount, cblk->u.mStreaming.mUnderrunFrames, mUnderrunCount);
|
}
|
|
// FIXME also wake futex so that underrun is noticed more quickly
|
(void) android_atomic_or(CBLK_UNDERRUN, &cblk->mFlags);
|
} else {
|
ALOGV_IF(mUnderrunning,
|
"tallyUnderrunFrames(%3u) at uf = %u, underrun finished",
|
frameCount, cblk->u.mStreaming.mUnderrunFrames);
|
mUnderrunning = false; // so we can detect the next edge
|
}
|
}
|
|
AudioPlaybackRate AudioTrackServerProxy::getPlaybackRate()
|
{ // do not call from multiple threads without holding lock
|
mPlaybackRateObserver.poll(mPlaybackRate);
|
return mPlaybackRate;
|
}
|
|
// ---------------------------------------------------------------------------
|
|
StaticAudioTrackServerProxy::StaticAudioTrackServerProxy(audio_track_cblk_t* cblk, void *buffers,
|
size_t frameCount, size_t frameSize)
|
: AudioTrackServerProxy(cblk, buffers, frameCount, frameSize),
|
mObserver(&cblk->u.mStatic.mSingleStateQueue),
|
mPosLoopMutator(&cblk->u.mStatic.mPosLoopQueue),
|
mFramesReadySafe(frameCount), mFramesReady(frameCount),
|
mFramesReadyIsCalledByMultipleThreads(false)
|
{
|
memset(&mState, 0, sizeof(mState));
|
}
|
|
void StaticAudioTrackServerProxy::framesReadyIsCalledByMultipleThreads()
|
{
|
mFramesReadyIsCalledByMultipleThreads = true;
|
}
|
|
size_t StaticAudioTrackServerProxy::framesReady()
|
{
|
// Can't call pollPosition() from multiple threads.
|
if (!mFramesReadyIsCalledByMultipleThreads) {
|
(void) pollPosition();
|
}
|
return mFramesReadySafe;
|
}
|
|
size_t StaticAudioTrackServerProxy::framesReadySafe() const
|
{
|
return mFramesReadySafe;
|
}
|
|
status_t StaticAudioTrackServerProxy::updateStateWithLoop(
|
StaticAudioTrackState *localState, const StaticAudioTrackState &update) const
|
{
|
if (localState->mLoopSequence != update.mLoopSequence) {
|
bool valid = false;
|
const size_t loopStart = update.mLoopStart;
|
const size_t loopEnd = update.mLoopEnd;
|
size_t position = localState->mPosition;
|
if (update.mLoopCount == 0) {
|
valid = true;
|
} else if (update.mLoopCount >= -1) {
|
if (loopStart < loopEnd && loopEnd <= mFrameCount &&
|
loopEnd - loopStart >= MIN_LOOP) {
|
// If the current position is greater than the end of the loop
|
// we "wrap" to the loop start. This might cause an audible pop.
|
if (position >= loopEnd) {
|
position = loopStart;
|
}
|
valid = true;
|
}
|
}
|
if (!valid || position > mFrameCount) {
|
return NO_INIT;
|
}
|
localState->mPosition = position;
|
localState->mLoopCount = update.mLoopCount;
|
localState->mLoopEnd = loopEnd;
|
localState->mLoopStart = loopStart;
|
localState->mLoopSequence = update.mLoopSequence;
|
}
|
return OK;
|
}
|
|
status_t StaticAudioTrackServerProxy::updateStateWithPosition(
|
StaticAudioTrackState *localState, const StaticAudioTrackState &update) const
|
{
|
if (localState->mPositionSequence != update.mPositionSequence) {
|
if (update.mPosition > mFrameCount) {
|
return NO_INIT;
|
} else if (localState->mLoopCount != 0 && update.mPosition >= localState->mLoopEnd) {
|
localState->mLoopCount = 0; // disable loop count if position is beyond loop end.
|
}
|
localState->mPosition = update.mPosition;
|
localState->mPositionSequence = update.mPositionSequence;
|
}
|
return OK;
|
}
|
|
ssize_t StaticAudioTrackServerProxy::pollPosition()
|
{
|
StaticAudioTrackState state;
|
if (mObserver.poll(state)) {
|
StaticAudioTrackState trystate = mState;
|
bool result;
|
const int32_t diffSeq = (int32_t) state.mLoopSequence - (int32_t) state.mPositionSequence;
|
|
if (diffSeq < 0) {
|
result = updateStateWithLoop(&trystate, state) == OK &&
|
updateStateWithPosition(&trystate, state) == OK;
|
} else {
|
result = updateStateWithPosition(&trystate, state) == OK &&
|
updateStateWithLoop(&trystate, state) == OK;
|
}
|
if (!result) {
|
mObserver.done();
|
// caution: no update occurs so server state will be inconsistent with client state.
|
ALOGE("%s client pushed an invalid state, shutting down", __func__);
|
mIsShutdown = true;
|
return (ssize_t) NO_INIT;
|
}
|
mState = trystate;
|
if (mState.mLoopCount == -1) {
|
mFramesReady = INT64_MAX;
|
} else if (mState.mLoopCount == 0) {
|
mFramesReady = mFrameCount - mState.mPosition;
|
} else if (mState.mLoopCount > 0) {
|
// TODO: Later consider fixing overflow, but does not seem needed now
|
// as will not overflow if loopStart and loopEnd are Java "ints".
|
mFramesReady = int64_t(mState.mLoopCount) * (mState.mLoopEnd - mState.mLoopStart)
|
+ mFrameCount - mState.mPosition;
|
}
|
mFramesReadySafe = clampToSize(mFramesReady);
|
// This may overflow, but client is not supposed to rely on it
|
StaticAudioTrackPosLoop posLoop;
|
|
posLoop.mLoopCount = (int32_t) mState.mLoopCount;
|
posLoop.mBufferPosition = (uint32_t) mState.mPosition;
|
mPosLoopMutator.push(posLoop);
|
mObserver.done(); // safe to read mStatic variables.
|
}
|
return (ssize_t) mState.mPosition;
|
}
|
|
__attribute__((no_sanitize("integer")))
|
status_t StaticAudioTrackServerProxy::obtainBuffer(Buffer* buffer, bool ackFlush)
|
{
|
if (mIsShutdown) {
|
buffer->mFrameCount = 0;
|
buffer->mRaw = NULL;
|
buffer->mNonContig = 0;
|
mUnreleased = 0;
|
return NO_INIT;
|
}
|
ssize_t positionOrStatus = pollPosition();
|
if (positionOrStatus < 0) {
|
buffer->mFrameCount = 0;
|
buffer->mRaw = NULL;
|
buffer->mNonContig = 0;
|
mUnreleased = 0;
|
return (status_t) positionOrStatus;
|
}
|
size_t position = (size_t) positionOrStatus;
|
size_t end = mState.mLoopCount != 0 ? mState.mLoopEnd : mFrameCount;
|
size_t avail;
|
if (position < end) {
|
avail = end - position;
|
size_t wanted = buffer->mFrameCount;
|
if (avail < wanted) {
|
buffer->mFrameCount = avail;
|
} else {
|
avail = wanted;
|
}
|
buffer->mRaw = &((char *) mBuffers)[position * mFrameSize];
|
} else {
|
avail = 0;
|
buffer->mFrameCount = 0;
|
buffer->mRaw = NULL;
|
}
|
// As mFramesReady is the total remaining frames in the static audio track,
|
// it is always larger or equal to avail.
|
LOG_ALWAYS_FATAL_IF(mFramesReady < (int64_t) avail,
|
"%s: mFramesReady out of range, mFramesReady:%lld < avail:%zu",
|
__func__, (long long)mFramesReady, avail);
|
buffer->mNonContig = mFramesReady == INT64_MAX ? SIZE_MAX : clampToSize(mFramesReady - avail);
|
if (!ackFlush) {
|
mUnreleased = avail;
|
}
|
return NO_ERROR;
|
}
|
|
__attribute__((no_sanitize("integer")))
|
void StaticAudioTrackServerProxy::releaseBuffer(Buffer* buffer)
|
{
|
size_t stepCount = buffer->mFrameCount;
|
LOG_ALWAYS_FATAL_IF(!((int64_t) stepCount <= mFramesReady),
|
"%s: stepCount out of range, "
|
"!(stepCount:%zu <= mFramesReady:%lld)",
|
__func__, stepCount, (long long)mFramesReady);
|
LOG_ALWAYS_FATAL_IF(!(stepCount <= mUnreleased),
|
"%s: stepCount out of range, "
|
"!(stepCount:%zu <= mUnreleased:%zu)",
|
__func__, stepCount, mUnreleased);
|
if (stepCount == 0) {
|
// prevent accidental re-use of buffer
|
buffer->mRaw = NULL;
|
buffer->mNonContig = 0;
|
return;
|
}
|
mUnreleased -= stepCount;
|
audio_track_cblk_t* cblk = mCblk;
|
size_t position = mState.mPosition;
|
size_t newPosition = position + stepCount;
|
int32_t setFlags = 0;
|
if (!(position <= newPosition && newPosition <= mFrameCount)) {
|
ALOGW("%s newPosition %zu outside [%zu, %zu]", __func__, newPosition, position,
|
mFrameCount);
|
newPosition = mFrameCount;
|
} else if (mState.mLoopCount != 0 && newPosition == mState.mLoopEnd) {
|
newPosition = mState.mLoopStart;
|
if (mState.mLoopCount == -1 || --mState.mLoopCount != 0) {
|
setFlags = CBLK_LOOP_CYCLE;
|
} else {
|
setFlags = CBLK_LOOP_FINAL;
|
}
|
}
|
if (newPosition == mFrameCount) {
|
setFlags |= CBLK_BUFFER_END;
|
}
|
mState.mPosition = newPosition;
|
if (mFramesReady != INT64_MAX) {
|
mFramesReady -= stepCount;
|
}
|
mFramesReadySafe = clampToSize(mFramesReady);
|
|
cblk->mServer += stepCount;
|
mReleased += stepCount;
|
|
// This may overflow, but client is not supposed to rely on it
|
StaticAudioTrackPosLoop posLoop;
|
posLoop.mBufferPosition = mState.mPosition;
|
posLoop.mLoopCount = mState.mLoopCount;
|
mPosLoopMutator.push(posLoop);
|
if (setFlags != 0) {
|
(void) android_atomic_or(setFlags, &cblk->mFlags);
|
// this would be a good place to wake a futex
|
}
|
|
buffer->mFrameCount = 0;
|
buffer->mRaw = NULL;
|
buffer->mNonContig = 0;
|
}
|
|
void StaticAudioTrackServerProxy::tallyUnderrunFrames(uint32_t frameCount)
|
{
|
// Unlike AudioTrackServerProxy::tallyUnderrunFrames() used for streaming tracks,
|
// we don't have a location to count underrun frames. The underrun frame counter
|
// only exists in AudioTrackSharedStreaming. Fortunately, underruns are not
|
// possible for static buffer tracks other than at end of buffer, so this is not a loss.
|
|
// FIXME also wake futex so that underrun is noticed more quickly
|
if (frameCount > 0) {
|
(void) android_atomic_or(CBLK_UNDERRUN, &mCblk->mFlags);
|
}
|
}
|
|
int32_t StaticAudioTrackServerProxy::getRear() const
|
{
|
LOG_ALWAYS_FATAL("getRear() not permitted for static tracks");
|
return 0;
|
}
|
|
__attribute__((no_sanitize("integer")))
|
size_t AudioRecordServerProxy::framesReadySafe() const
|
{
|
if (mIsShutdown) {
|
return 0;
|
}
|
const int32_t front = android_atomic_acquire_load(&mCblk->u.mStreaming.mFront);
|
const int32_t rear = mCblk->u.mStreaming.mRear;
|
const ssize_t filled = audio_utils::safe_sub_overflow(rear, front);
|
if (!(0 <= filled && (size_t) filled <= mFrameCount)) {
|
return 0; // error condition, silently return 0.
|
}
|
return filled;
|
}
|
|
// ---------------------------------------------------------------------------
|
|
} // namespace android
|
