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// Copyright (c) 2011 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.
#include "content/browser/renderer_host/video_capture_controller.h"
#include "base/logging.h"
#include "base/stl_util-inl.h"
#include "content/browser/browser_thread.h"
#include "content/browser/media_stream/video_capture_manager.h"
#include "media/base/yuv_convert.h"
#if defined(OS_WIN)
#include "content/common/section_util_win.h"
#endif
// The number of TransportDIBs VideoCaptureController allocate.
static const size_t kNoOfDIBS = 3;
VideoCaptureController::VideoCaptureController(
ControllerId id,
base::ProcessHandle render_process,
EventHandler* event_handler)
: render_handle_(render_process),
report_ready_to_delete_(false),
event_handler_(event_handler),
id_(id) {}
VideoCaptureController::~VideoCaptureController() {
// Delete all TransportDIBs.
STLDeleteContainerPairSecondPointers(owned_dibs_.begin(),
owned_dibs_.end());
}
void VideoCaptureController::StartCapture(
const media::VideoCaptureParams& params) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
params_ = params;
media_stream::VideoCaptureManager* manager =
media_stream::VideoCaptureManager::Get();
// Order the manager to start the actual capture.
manager->Start(params, this);
}
void VideoCaptureController::StopCapture(Task* stopped_task) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
media_stream::VideoCaptureManager* manager =
media_stream::VideoCaptureManager::Get();
manager->Stop(params_.session_id,
NewRunnableMethod(this,
&VideoCaptureController::OnDeviceStopped,
stopped_task));
}
void VideoCaptureController::ReturnTransportDIB(TransportDIB::Handle handle) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
bool ready_to_delete;
{
base::AutoLock lock(lock_);
free_dibs_.push_back(handle);
ready_to_delete = (free_dibs_.size() == owned_dibs_.size());
}
if (report_ready_to_delete_ && ready_to_delete) {
event_handler_->OnReadyToDelete(id_);
}
}
///////////////////////////////////////////////////////////////////////////////
// Implements VideoCaptureDevice::EventHandler.
// OnIncomingCapturedFrame is called the thread running the capture device.
// I.e.- DirectShow thread on windows and v4l2_thread on Linux.
void VideoCaptureController::OnIncomingCapturedFrame(const uint8* data,
int length,
base::Time timestamp) {
TransportDIB::Handle handle;
TransportDIB* dib = NULL;
// Check if there is a TransportDIB to fill.
bool buffer_exist = false;
{
base::AutoLock lock(lock_);
if (!report_ready_to_delete_ && free_dibs_.size() > 0) {
handle = free_dibs_.back();
free_dibs_.pop_back();
DIBMap::iterator it = owned_dibs_.find(handle);
if (it != owned_dibs_.end()) {
dib = it->second;
buffer_exist = true;
}
}
}
if (!buffer_exist) {
return;
}
if (!dib->Map()) {
VLOG(1) << "OnIncomingCapturedFrame - Failed to map handle.";
base::AutoLock lock(lock_);
free_dibs_.push_back(handle);
return;
}
uint8* target = static_cast<uint8*>(dib->memory());
CHECK(dib->size() >= static_cast<size_t> (frame_info_.width *
frame_info_.height * 3) /
2);
// Do color conversion from the camera format to I420.
switch (frame_info_.color) {
case media::VideoCaptureDevice::kColorUnknown: // Color format not set.
break;
case media::VideoCaptureDevice::kI420: {
memcpy(target, data, (frame_info_.width * frame_info_.height * 3) / 2);
break;
}
case media::VideoCaptureDevice::kYUY2: {
uint8* yplane = target;
uint8* uplane = target + frame_info_.width * frame_info_.height;
uint8* vplane = uplane + (frame_info_.width * frame_info_.height) / 4;
media::ConvertYUY2ToYUV(data, yplane, uplane, vplane, frame_info_.width,
frame_info_.height);
break;
}
case media::VideoCaptureDevice::kRGB24: {
#if defined(OS_WIN) // RGB on Windows start at the bottom line.
uint8* yplane = target;
uint8* uplane = target + frame_info_.width * frame_info_.height;
uint8* vplane = uplane + (frame_info_.width * frame_info_.height) / 4;
int ystride = frame_info_.width;
int uvstride = frame_info_.width / 2;
int rgb_stride = - 3 * frame_info_.width;
const uint8* rgb_src = data + 3 * frame_info_.width *
(frame_info_.height -1);
#else
uint8* yplane = target;
uint8* uplane = target + frame_info_.width * frame_info_.height;
uint8* vplane = uplane + (frame_info_.width * frame_info_.height) / 4;
int ystride = frame_info_.width;
int uvstride = frame_info_.width / 2;
int rgb_stride = 3 * frame_info_.width;
const uint8* rgb_src = data;
#endif
media::ConvertRGB24ToYUV(rgb_src, yplane, uplane, vplane,
frame_info_.width, frame_info_.height,
rgb_stride, ystride, uvstride);
break;
}
case media::VideoCaptureDevice::kARGB: {
uint8* yplane = target;
uint8* uplane = target + frame_info_.width * frame_info_.height;
uint8* vplane = uplane + (frame_info_.width * frame_info_.height) / 4;
media::ConvertRGB32ToYUV(data, yplane, uplane, vplane, frame_info_.width,
frame_info_.height, frame_info_.width * 4,
frame_info_.width, frame_info_.width / 2);
break;
}
default:
NOTREACHED();
}
event_handler_->OnBufferReady(id_, handle, timestamp);
}
void VideoCaptureController::OnError() {
event_handler_->OnError(id_);
}
void VideoCaptureController::OnFrameInfo(
const media::VideoCaptureDevice::Capability& info) {
DCHECK(owned_dibs_.empty());
bool frames_created = true;
const size_t needed_size = (info.width * info.height * 3) / 2;
for (size_t i = 0; i < kNoOfDIBS; ++i) {
TransportDIB* dib = TransportDIB::Create(needed_size, i);
if (!dib) {
frames_created = false;
break;
}
// Lock needed since the buffers are used in OnIncomingFrame
// and we need to use it there in order to avoid memcpy of complete frames.
base::AutoLock lock(lock_);
#if defined(OS_WIN)
// On Windows we need to get a handle the can be used in the render process.
TransportDIB::Handle handle = chrome::GetSectionForProcess(
dib->handle(), render_handle_, false);
#else
TransportDIB::Handle handle = dib->handle();
#endif
owned_dibs_.insert(std::make_pair(handle, dib));
free_dibs_.push_back(handle);
}
frame_info_= info;
// Check that all DIBs where created successfully.
if (!frames_created) {
event_handler_->OnError(id_);
}
event_handler_->OnFrameInfo(id_, info.width, info.height,
info.frame_rate);
}
///////////////////////////////////////////////////////////////////////////////
// Called by VideoCaptureManager when a device have been stopped.
// This will report to the event handler that this object is ready to be deleted
// if all DIBS have been returned.
void VideoCaptureController::OnDeviceStopped(Task* stopped_task) {
bool ready_to_delete_now;
// Set flag to indicate we need to report when all DIBs have been returned.
report_ready_to_delete_ = true;
{
base::AutoLock lock(lock_);
ready_to_delete_now = (free_dibs_.size() == owned_dibs_.size());
}
if (ready_to_delete_now) {
event_handler_->OnReadyToDelete(id_);
}
if (stopped_task) {
stopped_task->Run();
delete stopped_task;
}
}
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