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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//#define LOG_NDEBUG 0
#define LOG_TAG "VideoFramePool"
#include <v4l2_codec2/components/VideoFramePool.h>
#include <stdint.h>
#include <memory>
#include <android/hardware/graphics/common/1.0/types.h>
#include <base/bind.h>
#include <base/memory/ptr_util.h>
#include <base/time/time.h>
#include <log/log.h>
#include <v4l2_codec2/common/VideoTypes.h>
#include <v4l2_codec2/plugin_store/C2VdaBqBlockPool.h>
#include <v4l2_codec2/plugin_store/C2VdaPooledBlockPool.h>
#include <v4l2_codec2/plugin_store/V4L2AllocatorId.h>
using android::hardware::graphics::common::V1_0::BufferUsage;
namespace android {
// static
std::optional<uint32_t> VideoFramePool::getBufferIdFromGraphicBlock(C2BlockPool& blockPool,
const C2Block2D& block) {
ALOGV("%s() blockPool.getAllocatorId() = %u", __func__, blockPool.getAllocatorId());
if (blockPool.getAllocatorId() == android::V4L2AllocatorId::V4L2_BUFFERPOOL) {
return C2VdaPooledBlockPool::getBufferIdFromGraphicBlock(block);
} else if (blockPool.getAllocatorId() == C2PlatformAllocatorStore::BUFFERQUEUE) {
C2VdaBqBlockPool* bqPool = static_cast<C2VdaBqBlockPool*>(&blockPool);
return bqPool->getBufferIdFromGraphicBlock(block);
}
ALOGE("%s(): unknown allocator ID: %u", __func__, blockPool.getAllocatorId());
return std::nullopt;
}
// static
c2_status_t VideoFramePool::requestNewBufferSet(C2BlockPool& blockPool, int32_t bufferCount,
const ui::Size& size, uint32_t format,
C2MemoryUsage usage) {
ALOGV("%s() blockPool.getAllocatorId() = %u", __func__, blockPool.getAllocatorId());
if (blockPool.getAllocatorId() == android::V4L2AllocatorId::V4L2_BUFFERPOOL) {
C2VdaPooledBlockPool* bpPool = static_cast<C2VdaPooledBlockPool*>(&blockPool);
return bpPool->requestNewBufferSet(bufferCount);
} else if (blockPool.getAllocatorId() == C2PlatformAllocatorStore::BUFFERQUEUE) {
C2VdaBqBlockPool* bqPool = static_cast<C2VdaBqBlockPool*>(&blockPool);
return bqPool->requestNewBufferSet(bufferCount, size.width, size.height, format, usage);
}
ALOGE("%s(): unknown allocator ID: %u", __func__, blockPool.getAllocatorId());
return C2_BAD_VALUE;
}
// static
bool VideoFramePool::setNotifyBlockAvailableCb(C2BlockPool& blockPool, ::base::OnceClosure cb) {
ALOGV("%s() blockPool.getAllocatorId() = %u", __func__, blockPool.getAllocatorId());
if (blockPool.getAllocatorId() == C2PlatformAllocatorStore::BUFFERQUEUE) {
C2VdaBqBlockPool* bqPool = static_cast<C2VdaBqBlockPool*>(&blockPool);
return bqPool->setNotifyBlockAvailableCb(std::move(cb));
}
return false;
}
// static
std::unique_ptr<VideoFramePool> VideoFramePool::Create(
std::shared_ptr<C2BlockPool> blockPool, const size_t numBuffers, const ui::Size& size,
HalPixelFormat pixelFormat, bool isSecure,
scoped_refptr<::base::SequencedTaskRunner> taskRunner) {
ALOG_ASSERT(blockPool != nullptr);
uint64_t usage = static_cast<uint64_t>(BufferUsage::VIDEO_DECODER);
if (isSecure) {
usage |= C2MemoryUsage::READ_PROTECTED;
} else if (blockPool->getAllocatorId() == android::V4L2AllocatorId::V4L2_BUFFERPOOL) {
// CPU access to buffers is only required in byte buffer mode.
usage |= C2MemoryUsage::CPU_READ;
}
const C2MemoryUsage memoryUsage(usage);
if (requestNewBufferSet(*blockPool, numBuffers, size, static_cast<uint32_t>(pixelFormat),
memoryUsage) != C2_OK) {
return nullptr;
}
std::unique_ptr<VideoFramePool> pool = ::base::WrapUnique(new VideoFramePool(
std::move(blockPool), size, pixelFormat, memoryUsage, std::move(taskRunner)));
if (!pool->initialize()) return nullptr;
return pool;
}
VideoFramePool::VideoFramePool(std::shared_ptr<C2BlockPool> blockPool, const ui::Size& size,
HalPixelFormat pixelFormat, C2MemoryUsage memoryUsage,
scoped_refptr<::base::SequencedTaskRunner> taskRunner)
: mBlockPool(std::move(blockPool)),
mSize(size),
mPixelFormat(pixelFormat),
mMemoryUsage(memoryUsage),
mClientTaskRunner(std::move(taskRunner)) {
ALOGV("%s(size=%dx%d)", __func__, size.width, size.height);
ALOG_ASSERT(mClientTaskRunner->RunsTasksInCurrentSequence());
DCHECK(mBlockPool);
DCHECK(mClientTaskRunner);
}
bool VideoFramePool::initialize() {
if (!mFetchThread.Start()) {
ALOGE("Fetch thread failed to start.");
return false;
}
mFetchTaskRunner = mFetchThread.task_runner();
mClientWeakThis = mClientWeakThisFactory.GetWeakPtr();
mFetchWeakThis = mFetchWeakThisFactory.GetWeakPtr();
return true;
}
VideoFramePool::~VideoFramePool() {
ALOGV("%s()", __func__);
ALOG_ASSERT(mClientTaskRunner->RunsTasksInCurrentSequence());
mClientWeakThisFactory.InvalidateWeakPtrs();
if (mFetchThread.IsRunning()) {
mFetchTaskRunner->PostTask(FROM_HERE,
::base::BindOnce(&VideoFramePool::destroyTask, mFetchWeakThis));
mFetchThread.Stop();
}
}
void VideoFramePool::destroyTask() {
ALOGV("%s()", __func__);
ALOG_ASSERT(mFetchTaskRunner->RunsTasksInCurrentSequence());
mFetchWeakThisFactory.InvalidateWeakPtrs();
}
bool VideoFramePool::getVideoFrame(GetVideoFrameCB cb) {
ALOGV("%s()", __func__);
ALOG_ASSERT(mClientTaskRunner->RunsTasksInCurrentSequence());
if (mOutputCb) {
return false;
}
mOutputCb = std::move(cb);
mFetchTaskRunner->PostTask(
FROM_HERE, ::base::BindOnce(&VideoFramePool::getVideoFrameTask, mFetchWeakThis));
return true;
}
// static
void VideoFramePool::getVideoFrameTaskThunk(
scoped_refptr<::base::SequencedTaskRunner> taskRunner,
std::optional<::base::WeakPtr<VideoFramePool>> weakPool) {
ALOGV("%s()", __func__);
ALOG_ASSERT(weakPool);
taskRunner->PostTask(FROM_HERE,
::base::BindOnce(&VideoFramePool::getVideoFrameTask, *weakPool));
}
void VideoFramePool::getVideoFrameTask() {
ALOGV("%s()", __func__);
ALOG_ASSERT(mFetchTaskRunner->RunsTasksInCurrentSequence());
// Variables used to exponential backoff retry when buffer fetching times out.
constexpr size_t kFetchRetryDelayInit = 64; // Initial delay: 64us
constexpr size_t kFetchRetryDelayMax = 16384; // Max delay: 16ms (1 frame at 60fps)
static size_t sNumRetries = 0;
static size_t sDelay = kFetchRetryDelayInit;
std::shared_ptr<C2GraphicBlock> block;
c2_status_t err = mBlockPool->fetchGraphicBlock(
mSize.width, mSize.height, static_cast<uint32_t>(mPixelFormat), mMemoryUsage, &block);
if (err == C2_TIMED_OUT || err == C2_BLOCKING) {
if (setNotifyBlockAvailableCb(*mBlockPool,
::base::BindOnce(&VideoFramePool::getVideoFrameTaskThunk,
mFetchTaskRunner, mFetchWeakThis))) {
ALOGV("%s(): fetchGraphicBlock() timeout, waiting for block available.", __func__);
} else {
ALOGV("%s(): fetchGraphicBlock() timeout, waiting %zuus (%zu retry)", __func__, sDelay,
sNumRetries + 1);
mFetchTaskRunner->PostDelayedTask(
FROM_HERE, ::base::BindOnce(&VideoFramePool::getVideoFrameTask, mFetchWeakThis),
::base::TimeDelta::FromMicroseconds(sDelay));
sDelay = std::min(sDelay * 2, kFetchRetryDelayMax); // Exponential backoff
sNumRetries++;
}
return;
}
// Reset to the default value.
sNumRetries = 0;
sDelay = kFetchRetryDelayInit;
std::optional<FrameWithBlockId> frameWithBlockId;
if (err == C2_OK) {
ALOG_ASSERT(block != nullptr);
std::optional<uint32_t> bufferId = getBufferIdFromGraphicBlock(*mBlockPool, *block);
std::unique_ptr<VideoFrame> frame = VideoFrame::Create(std::move(block));
// Only pass the frame + id pair if both have successfully been obtained.
// Otherwise exit the loop so a nullopt is passed to the client.
if (bufferId && frame) {
frameWithBlockId = std::make_pair(std::move(frame), *bufferId);
} else {
ALOGE("%s(): Failed to generate VideoFrame or get the buffer id.", __func__);
}
} else {
ALOGE("%s(): Failed to fetch block, err=%d", __func__, err);
}
mClientTaskRunner->PostTask(
FROM_HERE, ::base::BindOnce(&VideoFramePool::onVideoFrameReady, mClientWeakThis,
std::move(frameWithBlockId)));
}
void VideoFramePool::onVideoFrameReady(std::optional<FrameWithBlockId> frameWithBlockId) {
ALOGV("%s()", __func__);
ALOG_ASSERT(mClientTaskRunner->RunsTasksInCurrentSequence());
if (!frameWithBlockId) {
ALOGE("Failed to get GraphicBlock, abandoning all pending requests.");
mClientWeakThisFactory.InvalidateWeakPtrs();
mClientWeakThis = mClientWeakThisFactory.GetWeakPtr();
}
ALOG_ASSERT(mOutputCb);
std::move(mOutputCb).Run(std::move(frameWithBlockId));
}
} // namespace android
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