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/*
* Copyright 2014 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.
*/
#include <inttypes.h>
#define LOG_TAG "StreamSplitter"
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
//#define LOG_NDEBUG 0
#include <gui/BufferItem.h>
#include <gui/IGraphicBufferConsumer.h>
#include <gui/IGraphicBufferProducer.h>
#include <gui/StreamSplitter.h>
#include <ui/GraphicBuffer.h>
#include <binder/ProcessState.h>
#include <utils/Trace.h>
namespace android {
status_t StreamSplitter::createSplitter(
const sp<IGraphicBufferConsumer>& inputQueue,
sp<StreamSplitter>* outSplitter) {
if (inputQueue == NULL) {
ALOGE("createSplitter: inputQueue must not be NULL");
return BAD_VALUE;
}
if (outSplitter == NULL) {
ALOGE("createSplitter: outSplitter must not be NULL");
return BAD_VALUE;
}
sp<StreamSplitter> splitter(new StreamSplitter(inputQueue));
status_t status = splitter->mInput->consumerConnect(splitter, false);
if (status == NO_ERROR) {
splitter->mInput->setConsumerName(String8("StreamSplitter"));
*outSplitter = splitter;
}
return status;
}
StreamSplitter::StreamSplitter(const sp<IGraphicBufferConsumer>& inputQueue)
: mIsAbandoned(false), mMutex(), mReleaseCondition(),
mOutstandingBuffers(0), mInput(inputQueue), mOutputs(), mBuffers() {}
StreamSplitter::~StreamSplitter() {
mInput->consumerDisconnect();
Vector<sp<IGraphicBufferProducer> >::iterator output = mOutputs.begin();
for (; output != mOutputs.end(); ++output) {
(*output)->disconnect(NATIVE_WINDOW_API_CPU);
}
if (mBuffers.size() > 0) {
ALOGE("%zu buffers still being tracked", mBuffers.size());
}
}
status_t StreamSplitter::addOutput(
const sp<IGraphicBufferProducer>& outputQueue) {
if (outputQueue == NULL) {
ALOGE("addOutput: outputQueue must not be NULL");
return BAD_VALUE;
}
Mutex::Autolock lock(mMutex);
IGraphicBufferProducer::QueueBufferOutput queueBufferOutput;
sp<OutputListener> listener(new OutputListener(this, outputQueue));
IInterface::asBinder(outputQueue)->linkToDeath(listener);
status_t status = outputQueue->connect(listener, NATIVE_WINDOW_API_CPU,
/* producerControlledByApp */ false, &queueBufferOutput);
if (status != NO_ERROR) {
ALOGE("addOutput: failed to connect (%d)", status);
return status;
}
mOutputs.push_back(outputQueue);
return NO_ERROR;
}
void StreamSplitter::setName(const String8 &name) {
Mutex::Autolock lock(mMutex);
mInput->setConsumerName(name);
}
void StreamSplitter::onFrameAvailable(const BufferItem& /* item */) {
ATRACE_CALL();
Mutex::Autolock lock(mMutex);
// The current policy is that if any one consumer is consuming buffers too
// slowly, the splitter will stall the rest of the outputs by not acquiring
// any more buffers from the input. This will cause back pressure on the
// input queue, slowing down its producer.
// If there are too many outstanding buffers, we block until a buffer is
// released back to the input in onBufferReleased
while (mOutstandingBuffers >= MAX_OUTSTANDING_BUFFERS) {
mReleaseCondition.wait(mMutex);
// If the splitter is abandoned while we are waiting, the release
// condition variable will be broadcast, and we should just return
// without attempting to do anything more (since the input queue will
// also be abandoned).
if (mIsAbandoned) {
return;
}
}
++mOutstandingBuffers;
// Acquire and detach the buffer from the input
BufferItem bufferItem;
status_t status = mInput->acquireBuffer(&bufferItem, /* presentWhen */ 0);
LOG_ALWAYS_FATAL_IF(status != NO_ERROR,
"acquiring buffer from input failed (%d)", status);
ALOGV("acquired buffer %#" PRIx64 " from input",
bufferItem.mGraphicBuffer->getId());
status = mInput->detachBuffer(bufferItem.mSlot);
LOG_ALWAYS_FATAL_IF(status != NO_ERROR,
"detaching buffer from input failed (%d)", status);
// Initialize our reference count for this buffer
mBuffers.add(bufferItem.mGraphicBuffer->getId(),
new BufferTracker(bufferItem.mGraphicBuffer));
IGraphicBufferProducer::QueueBufferInput queueInput(
bufferItem.mTimestamp, bufferItem.mIsAutoTimestamp,
bufferItem.mDataSpace, bufferItem.mCrop,
static_cast<int32_t>(bufferItem.mScalingMode),
bufferItem.mTransform, bufferItem.mFence);
// Attach and queue the buffer to each of the outputs
Vector<sp<IGraphicBufferProducer> >::iterator output = mOutputs.begin();
for (; output != mOutputs.end(); ++output) {
int slot;
status = (*output)->attachBuffer(&slot, bufferItem.mGraphicBuffer);
if (status == NO_INIT) {
// If we just discovered that this output has been abandoned, note
// that, increment the release count so that we still release this
// buffer eventually, and move on to the next output
onAbandonedLocked();
mBuffers.editValueFor(bufferItem.mGraphicBuffer->getId())->
incrementReleaseCountLocked();
continue;
} else {
LOG_ALWAYS_FATAL_IF(status != NO_ERROR,
"attaching buffer to output failed (%d)", status);
}
IGraphicBufferProducer::QueueBufferOutput queueOutput;
status = (*output)->queueBuffer(slot, queueInput, &queueOutput);
if (status == NO_INIT) {
// If we just discovered that this output has been abandoned, note
// that, increment the release count so that we still release this
// buffer eventually, and move on to the next output
onAbandonedLocked();
mBuffers.editValueFor(bufferItem.mGraphicBuffer->getId())->
incrementReleaseCountLocked();
continue;
} else {
LOG_ALWAYS_FATAL_IF(status != NO_ERROR,
"queueing buffer to output failed (%d)", status);
}
ALOGV("queued buffer %#" PRIx64 " to output %p",
bufferItem.mGraphicBuffer->getId(), output->get());
}
}
void StreamSplitter::onBufferReleasedByOutput(
const sp<IGraphicBufferProducer>& from) {
ATRACE_CALL();
Mutex::Autolock lock(mMutex);
sp<GraphicBuffer> buffer;
sp<Fence> fence;
status_t status = from->detachNextBuffer(&buffer, &fence);
if (status == NO_INIT) {
// If we just discovered that this output has been abandoned, note that,
// but we can't do anything else, since buffer is invalid
onAbandonedLocked();
return;
} else {
LOG_ALWAYS_FATAL_IF(status != NO_ERROR,
"detaching buffer from output failed (%d)", status);
}
ALOGV("detached buffer %#" PRIx64 " from output %p",
buffer->getId(), from.get());
const sp<BufferTracker>& tracker = mBuffers.editValueFor(buffer->getId());
// Merge the release fence of the incoming buffer so that the fence we send
// back to the input includes all of the outputs' fences
tracker->mergeFence(fence);
// Check to see if this is the last outstanding reference to this buffer
size_t releaseCount = tracker->incrementReleaseCountLocked();
ALOGV("buffer %#" PRIx64 " reference count %zu (of %zu)", buffer->getId(),
releaseCount, mOutputs.size());
if (releaseCount < mOutputs.size()) {
return;
}
// If we've been abandoned, we can't return the buffer to the input, so just
// stop tracking it and move on
if (mIsAbandoned) {
mBuffers.removeItem(buffer->getId());
return;
}
// Attach and release the buffer back to the input
int consumerSlot;
status = mInput->attachBuffer(&consumerSlot, tracker->getBuffer());
LOG_ALWAYS_FATAL_IF(status != NO_ERROR,
"attaching buffer to input failed (%d)", status);
status = mInput->releaseBuffer(consumerSlot, /* frameNumber */ 0,
EGL_NO_DISPLAY, EGL_NO_SYNC_KHR, tracker->getMergedFence());
LOG_ALWAYS_FATAL_IF(status != NO_ERROR,
"releasing buffer to input failed (%d)", status);
ALOGV("released buffer %#" PRIx64 " to input", buffer->getId());
// We no longer need to track the buffer once it has been returned to the
// input
mBuffers.removeItem(buffer->getId());
// Notify any waiting onFrameAvailable calls
--mOutstandingBuffers;
mReleaseCondition.signal();
}
void StreamSplitter::onAbandonedLocked() {
ALOGE("one of my outputs has abandoned me");
if (!mIsAbandoned) {
mInput->consumerDisconnect();
}
mIsAbandoned = true;
mReleaseCondition.broadcast();
}
StreamSplitter::OutputListener::OutputListener(
const sp<StreamSplitter>& splitter,
const sp<IGraphicBufferProducer>& output)
: mSplitter(splitter), mOutput(output) {}
StreamSplitter::OutputListener::~OutputListener() {}
void StreamSplitter::OutputListener::onBufferReleased() {
mSplitter->onBufferReleasedByOutput(mOutput);
}
void StreamSplitter::OutputListener::binderDied(const wp<IBinder>& /* who */) {
Mutex::Autolock lock(mSplitter->mMutex);
mSplitter->onAbandonedLocked();
}
StreamSplitter::BufferTracker::BufferTracker(const sp<GraphicBuffer>& buffer)
: mBuffer(buffer), mMergedFence(Fence::NO_FENCE), mReleaseCount(0) {}
StreamSplitter::BufferTracker::~BufferTracker() {}
void StreamSplitter::BufferTracker::mergeFence(const sp<Fence>& with) {
mMergedFence = Fence::merge(String8("StreamSplitter"), mMergedFence, with);
}
} // namespace android