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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 "media/video/capture/fake_video_capture_device.h"
#include <string>
#include "base/bind.h"
#include "base/memory/scoped_ptr.h"
#include "base/stringprintf.h"
namespace media {
static const int kFakeCaptureTimeoutMs = 100;
enum { kNumberOfFakeDevices = 2 };
void FakeVideoCaptureDevice::GetDeviceNames(Names* const device_names) {
// Empty the name list.
device_names->erase(device_names->begin(), device_names->end());
for (int n = 0; n < kNumberOfFakeDevices; n++) {
Name name;
name.unique_id = StringPrintf("/dev/video%d", n);
name.device_name = StringPrintf("fake_device_%d", n);
device_names->push_back(name);
}
}
VideoCaptureDevice* FakeVideoCaptureDevice::Create(const Name& device_name) {
for (int n = 0; n < kNumberOfFakeDevices; ++n) {
std::string possible_id = StringPrintf("/dev/video%d", n);
if (device_name.unique_id.compare(possible_id) == 0) {
return new FakeVideoCaptureDevice(device_name);
}
}
return NULL;
}
FakeVideoCaptureDevice::FakeVideoCaptureDevice(const Name& device_name)
: device_name_(device_name),
observer_(NULL),
state_(kIdle),
capture_thread_("CaptureThread") {
}
FakeVideoCaptureDevice::~FakeVideoCaptureDevice() {
// Check if the thread is running.
// This means that the device have not been DeAllocated properly.
DCHECK(!capture_thread_.IsRunning());
}
void FakeVideoCaptureDevice::Allocate(int width,
int height,
int frame_rate,
EventHandler* observer) {
if (state_ != kIdle) {
return; // Wrong state.
}
observer_ = observer;
Capability current_settings;
current_settings.color = kI420;
if (width > 320) { // VGA
current_settings.width = 640;
current_settings.height = 480;
current_settings.frame_rate = 30;
} else { // QVGA
current_settings.width = 320;
current_settings.height = 240;
current_settings.frame_rate = 30;
}
size_t fake_frame_size =
current_settings.width * current_settings.height * 3 / 2;
fake_frame_.reset(new uint8[fake_frame_size]);
memset(fake_frame_.get(), 0, fake_frame_size);
state_ = kAllocated;
observer_->OnFrameInfo(current_settings);
}
void FakeVideoCaptureDevice::Start() {
if (state_ != kAllocated) {
return; // Wrong state.
}
state_ = kCapturing;
capture_thread_.Start();
capture_thread_.message_loop()->PostTask(
FROM_HERE,
base::Bind(&FakeVideoCaptureDevice::OnCaptureTask,
base::Unretained(this)));
}
void FakeVideoCaptureDevice::Stop() {
if (state_ != kCapturing) {
return; // Wrong state.
}
capture_thread_.Stop();
state_ = kAllocated;
}
void FakeVideoCaptureDevice::DeAllocate() {
if (state_ != kAllocated && state_ != kCapturing) {
return; // Wrong state.
}
capture_thread_.Stop();
state_ = kIdle;
}
const VideoCaptureDevice::Name& FakeVideoCaptureDevice::device_name() {
return device_name_;
}
void FakeVideoCaptureDevice::OnCaptureTask() {
if (state_ != kCapturing) {
return;
}
// Give the captured frame to the observer.
observer_->OnIncomingCapturedFrame(fake_frame_.get(),
sizeof(fake_frame_.get()),
base::Time::Now());
// Reschedule next CaptureTask.
capture_thread_.message_loop()->PostDelayedTask(
FROM_HERE,
base::Bind(&FakeVideoCaptureDevice::OnCaptureTask,
base::Unretained(this)),
kFakeCaptureTimeoutMs);
}
} // namespace media
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