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// Copyright 2014 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/common/gpu/media/fake_video_decode_accelerator.h"
#include <stddef.h>
#include <string.h>
#include "base/bind.h"
#include "base/location.h"
#include "base/thread_task_runner_handle.h"
#include "media/base/bitstream_buffer.h"
#include "media/base/limits.h"
#include "ui/gl/gl_context.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_surface.h"
#include "ui/gl/gl_surface_egl.h"
#include "ui/gl/gl_surface_glx.h"
namespace content {
static const uint32_t kDefaultTextureTarget = GL_TEXTURE_2D;
// Must be at least 2 since the rendering helper will switch between textures
// and if there is only one, it will wait for the next one that will never come.
// Must also be an even number as otherwise there won't be the same amount of
// white and black frames.
static const unsigned int kNumBuffers = media::limits::kMaxVideoFrames +
(media::limits::kMaxVideoFrames & 1u);
FakeVideoDecodeAccelerator::FakeVideoDecodeAccelerator(
gfx::GLContext* gl,
gfx::Size size,
const base::Callback<bool(void)>& make_context_current)
: child_task_runner_(base::ThreadTaskRunnerHandle::Get()),
client_(NULL),
make_context_current_(make_context_current),
gl_(gl),
frame_buffer_size_(size),
flushing_(false),
weak_this_factory_(this) {
}
FakeVideoDecodeAccelerator::~FakeVideoDecodeAccelerator() {
}
bool FakeVideoDecodeAccelerator::Initialize(const Config& config,
Client* client) {
DCHECK(child_task_runner_->BelongsToCurrentThread());
if (config.profile == media::VIDEO_CODEC_PROFILE_UNKNOWN) {
LOG(ERROR) << "unknown codec profile";
return false;
}
if (config.is_encrypted) {
NOTREACHED() << "encrypted streams are not supported";
return false;
}
// V4L2VideoDecodeAccelerator waits until first decode call to ask for buffers
// This class asks for it on initialization instead.
client_ = client;
client_->ProvidePictureBuffers(kNumBuffers,
frame_buffer_size_,
kDefaultTextureTarget);
return true;
}
void FakeVideoDecodeAccelerator::Decode(
const media::BitstreamBuffer& bitstream_buffer) {
// We won't really read from the bitstream_buffer, close the handle.
if (base::SharedMemory::IsHandleValid(bitstream_buffer.handle()))
base::SharedMemory::CloseHandle(bitstream_buffer.handle());
if (bitstream_buffer.id() < 0) {
LOG(ERROR) << "Invalid bitstream: id=" << bitstream_buffer.id();
client_->NotifyError(INVALID_ARGUMENT);
return;
}
int bitstream_buffer_id = bitstream_buffer.id();
queued_bitstream_ids_.push(bitstream_buffer_id);
child_task_runner_->PostTask(
FROM_HERE, base::Bind(&FakeVideoDecodeAccelerator::DoPictureReady,
weak_this_factory_.GetWeakPtr()));
}
// Similar to UseOutputBitstreamBuffer for the encode accelerator.
void FakeVideoDecodeAccelerator::AssignPictureBuffers(
const std::vector<media::PictureBuffer>& buffers) {
DCHECK(buffers.size() == kNumBuffers);
DCHECK(!(buffers.size()%2));
// Save buffers and mark all buffers as ready for use.
scoped_ptr<uint8_t[]> white_data(
new uint8_t[frame_buffer_size_.width() * frame_buffer_size_.height() *
4]);
memset(white_data.get(),
UINT8_MAX,
frame_buffer_size_.width() * frame_buffer_size_.height() * 4);
scoped_ptr<uint8_t[]> black_data(
new uint8_t[frame_buffer_size_.width() * frame_buffer_size_.height() *
4]);
memset(black_data.get(),
0,
frame_buffer_size_.width() * frame_buffer_size_.height() * 4);
if (!make_context_current_.Run()) {
LOG(ERROR) << "ReusePictureBuffer(): could not make context current";
return;
}
for (size_t index = 0; index < buffers.size(); ++index) {
glBindTexture(GL_TEXTURE_2D, buffers[index].texture_id());
// Every other frame white and the rest black.
uint8_t* data = index % 2 ? white_data.get() : black_data.get();
glTexImage2D(GL_TEXTURE_2D,
0,
GL_RGBA,
frame_buffer_size_.width(),
frame_buffer_size_.height(),
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
data);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
free_output_buffers_.push(buffers[index].id());
}
child_task_runner_->PostTask(
FROM_HERE, base::Bind(&FakeVideoDecodeAccelerator::DoPictureReady,
weak_this_factory_.GetWeakPtr()));
}
void FakeVideoDecodeAccelerator::ReusePictureBuffer(int32_t picture_buffer_id) {
free_output_buffers_.push(picture_buffer_id);
child_task_runner_->PostTask(
FROM_HERE, base::Bind(&FakeVideoDecodeAccelerator::DoPictureReady,
weak_this_factory_.GetWeakPtr()));
}
void FakeVideoDecodeAccelerator::Flush() {
flushing_ = true;
child_task_runner_->PostTask(
FROM_HERE, base::Bind(&FakeVideoDecodeAccelerator::DoPictureReady,
weak_this_factory_.GetWeakPtr()));
}
void FakeVideoDecodeAccelerator::Reset() {
while (!queued_bitstream_ids_.empty()) {
client_->NotifyEndOfBitstreamBuffer(queued_bitstream_ids_.front());
queued_bitstream_ids_.pop();
}
client_->NotifyResetDone();
}
void FakeVideoDecodeAccelerator::Destroy() {
while (!queued_bitstream_ids_.empty()) {
client_->NotifyEndOfBitstreamBuffer(queued_bitstream_ids_.front());
queued_bitstream_ids_.pop();
}
delete this;
}
bool FakeVideoDecodeAccelerator::CanDecodeOnIOThread() {
return true;
}
void FakeVideoDecodeAccelerator::DoPictureReady() {
if (flushing_ && queued_bitstream_ids_.empty()) {
flushing_ = false;
client_->NotifyFlushDone();
}
while (!free_output_buffers_.empty() && !queued_bitstream_ids_.empty()) {
int bitstream_id = queued_bitstream_ids_.front();
queued_bitstream_ids_.pop();
int buffer_id = free_output_buffers_.front();
free_output_buffers_.pop();
const media::Picture picture =
media::Picture(buffer_id,
bitstream_id,
gfx::Rect(frame_buffer_size_),
false);
client_->PictureReady(picture);
// Bitstream no longer needed.
client_->NotifyEndOfBitstreamBuffer(bitstream_id);
if (flushing_ && queued_bitstream_ids_.empty()) {
flushing_ = false;
client_->NotifyFlushDone();
}
}
}
} // namespace content
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