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// Copyright (c) 2012 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/strings/stringprintf.h"
#include "media/audio/fake_audio_input_stream.h"
#include "media/base/video_frame.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkPaint.h"
namespace media {
static const int kFakeCaptureBeepCycle = 10; // Visual beep every 0.5s.
void DrawPacman(bool use_argb,
uint8_t* const data,
int frame_count,
int frame_interval,
const gfx::Size& frame_size) {
// |kN32_SkColorType| stands for the appropriiate RGBA/BGRA format.
const SkColorType colorspace =
use_argb ? kN32_SkColorType : kAlpha_8_SkColorType;
const SkImageInfo info = SkImageInfo::Make(frame_size.width(),
frame_size.height(),
colorspace,
kOpaque_SkAlphaType);
SkBitmap bitmap;
bitmap.setInfo(info);
bitmap.setPixels(data);
SkPaint paint;
paint.setStyle(SkPaint::kFill_Style);
SkCanvas canvas(bitmap);
// Equalize Alpha_8 that has light green background while RGBA has white.
if (use_argb) {
const SkRect full_frame = SkRect::MakeWH(frame_size.width(),
frame_size.height());
paint.setARGB(255, 0, 127, 0);
canvas.drawRect(full_frame, paint);
}
paint.setColor(SK_ColorGREEN);
// Draw a sweeping circle to show an animation.
const int end_angle = (3 * kFakeCaptureBeepCycle * frame_count % 361);
const int radius = std::min(frame_size.width(), frame_size.height()) / 4;
const SkRect rect = SkRect::MakeXYWH(frame_size.width() / 2 - radius,
frame_size.height() / 2 - radius,
2 * radius,
2 * radius);
canvas.drawArc(rect, 0, end_angle, true, paint);
// Draw current time.
const int elapsed_ms = frame_interval * frame_count;
const int milliseconds = elapsed_ms % 1000;
const int seconds = (elapsed_ms / 1000) % 60;
const int minutes = (elapsed_ms / 1000 / 60) % 60;
const int hours = (elapsed_ms / 1000 / 60 / 60) % 60;
const std::string time_string = base::StringPrintf("%d:%02d:%02d:%03d %d",
hours, minutes, seconds, milliseconds, frame_count);
canvas.scale(3, 3);
canvas.drawText(time_string.data(), time_string.length(), 30, 20, paint);
}
FakeVideoCaptureDevice::FakeVideoCaptureDevice(
FakeVideoCaptureDeviceType device_type)
: device_type_(device_type),
frame_count_(0),
weak_factory_(this) {}
FakeVideoCaptureDevice::~FakeVideoCaptureDevice() {
DCHECK(thread_checker_.CalledOnValidThread());
}
void FakeVideoCaptureDevice::AllocateAndStart(
const VideoCaptureParams& params,
scoped_ptr<VideoCaptureDevice::Client> client) {
DCHECK(thread_checker_.CalledOnValidThread());
client_ = client.Pass();
// Incoming |params| can be none of the supported formats, so we get the
// closest thing rounded up. TODO(mcasas): Use the |params|, if they belong to
// the supported ones, when http://crbug.com/309554 is verified.
DCHECK_EQ(params.requested_format.pixel_format, PIXEL_FORMAT_I420);
capture_format_.pixel_format = params.requested_format.pixel_format;
capture_format_.frame_rate = 30.0;
if (params.requested_format.frame_size.width() > 1280)
capture_format_.frame_size.SetSize(1920, 1080);
else if (params.requested_format.frame_size.width() > 640)
capture_format_.frame_size.SetSize(1280, 720);
else if (params.requested_format.frame_size.width() > 320)
capture_format_.frame_size.SetSize(640, 480);
else
capture_format_.frame_size.SetSize(320, 240);
switch (device_type_) {
case USING_OWN_BUFFERS:
fake_frame_.reset(new uint8[VideoFrame::AllocationSize(
VideoFrame::I420, capture_format_.frame_size)]);
BeepAndScheduleNextCapture(
base::Bind(&FakeVideoCaptureDevice::CaptureUsingOwnBuffers,
weak_factory_.GetWeakPtr()));
break;
case USING_CLIENT_BUFFERS:
BeepAndScheduleNextCapture(
base::Bind(&FakeVideoCaptureDevice::CaptureUsingClientBuffers,
weak_factory_.GetWeakPtr()));
break;
case USING_GPU_MEMORY_BUFFERS:
BeepAndScheduleNextCapture(
base::Bind(&FakeVideoCaptureDevice::CaptureUsingGpuMemoryBuffers,
weak_factory_.GetWeakPtr()));
break;
default:
client_->OnError("Unknown Fake Video Capture Device type.");
}
}
void FakeVideoCaptureDevice::StopAndDeAllocate() {
DCHECK(thread_checker_.CalledOnValidThread());
client_.reset();
}
void FakeVideoCaptureDevice::CaptureUsingOwnBuffers() {
DCHECK(thread_checker_.CalledOnValidThread());
const size_t frame_size =
VideoFrame::AllocationSize(VideoFrame::I420, capture_format_.frame_size);
memset(fake_frame_.get(), 0, frame_size);
DrawPacman(false /* use_argb */,
fake_frame_.get(),
frame_count_,
kFakeCapturePeriodMs,
capture_format_.frame_size);
// Give the captured frame to the client.
client_->OnIncomingCapturedData(fake_frame_.get(),
frame_size,
capture_format_,
0,
base::TimeTicks::Now());
BeepAndScheduleNextCapture(
base::Bind(&FakeVideoCaptureDevice::CaptureUsingOwnBuffers,
weak_factory_.GetWeakPtr()));
}
void FakeVideoCaptureDevice::CaptureUsingClientBuffers() {
DCHECK(thread_checker_.CalledOnValidThread());
const scoped_refptr<VideoCaptureDevice::Client::Buffer> capture_buffer =
client_->ReserveOutputBuffer(VideoFrame::I420,
capture_format_.frame_size);
DLOG_IF(ERROR, !capture_buffer) << "Couldn't allocate Capture Buffer";
if (!capture_buffer)
return;
uint8_t* const data_ptr = static_cast<uint8_t*>(capture_buffer->data());
memset(data_ptr, 0, capture_buffer->size());
DCHECK(data_ptr) << "Buffer has NO backing memory";
DrawPacman(false /* use_argb */,
data_ptr,
frame_count_,
kFakeCapturePeriodMs,
capture_format_.frame_size);
scoped_refptr<VideoFrame> video_frame =
VideoFrame::WrapExternalPackedMemory(
VideoFrame::I420,
capture_format_.frame_size,
gfx::Rect(capture_format_.frame_size),
capture_format_.frame_size,
static_cast<uint8*>(capture_buffer->data()),
capture_buffer->size(),
base::SharedMemory::NULLHandle(),
0,
base::TimeDelta(),
base::Closure());
// Give the captured frame to the client.
client_->OnIncomingCapturedVideoFrame(capture_buffer,
video_frame,
base::TimeTicks::Now());
BeepAndScheduleNextCapture(
base::Bind(&FakeVideoCaptureDevice::CaptureUsingClientBuffers,
weak_factory_.GetWeakPtr()));
}
void FakeVideoCaptureDevice::CaptureUsingGpuMemoryBuffers() {
DCHECK(thread_checker_.CalledOnValidThread());
NOTIMPLEMENTED();
}
void FakeVideoCaptureDevice::BeepAndScheduleNextCapture(
const base::Closure& next_capture) {
// Generate a synchronized beep sound every so many frames.
if (frame_count_++ % kFakeCaptureBeepCycle == 0)
FakeAudioInputStream::BeepOnce();
// Reschedule next CaptureTask.
base::MessageLoop::current()->PostDelayedTask(FROM_HERE, next_capture,
base::TimeDelta::FromMilliseconds(kFakeCapturePeriodMs));
}
} // namespace media
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