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// Copyright 2015 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/cast/sender/size_adaptable_video_encoder_base.h"
#include <utility>
#include "base/bind.h"
#include "base/location.h"
#include "media/base/video_frame.h"
namespace media {
namespace cast {
SizeAdaptableVideoEncoderBase::SizeAdaptableVideoEncoderBase(
const scoped_refptr<CastEnvironment>& cast_environment,
const FrameSenderConfig& video_config,
const StatusChangeCallback& status_change_cb)
: cast_environment_(cast_environment),
video_config_(video_config),
status_change_cb_(status_change_cb),
frames_in_encoder_(0),
next_frame_id_(FrameId::first()),
weak_factory_(this) {
cast_environment_->PostTask(
CastEnvironment::MAIN,
FROM_HERE,
base::Bind(status_change_cb_, STATUS_INITIALIZED));
}
SizeAdaptableVideoEncoderBase::~SizeAdaptableVideoEncoderBase() {
DestroyEncoder();
}
bool SizeAdaptableVideoEncoderBase::EncodeVideoFrame(
scoped_refptr<media::VideoFrame> video_frame,
const base::TimeTicks& reference_time,
const FrameEncodedCallback& frame_encoded_callback) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
const gfx::Size frame_size = video_frame->visible_rect().size();
if (frame_size.IsEmpty()) {
DVLOG(1) << "Rejecting empty video frame.";
return false;
}
if (frames_in_encoder_ == kEncoderIsInitializing) {
VLOG(1) << "Dropping frame since encoder initialization is in-progress.";
return false;
}
if (frame_size != frame_size_ || !encoder_) {
VLOG(1) << "Dropping this frame, and future frames until a replacement "
"encoder is spun-up to handle size " << frame_size.ToString();
TrySpawningReplacementEncoder(frame_size);
return false;
}
const bool is_frame_accepted = encoder_->EncodeVideoFrame(
std::move(video_frame), reference_time,
base::Bind(&SizeAdaptableVideoEncoderBase::OnEncodedVideoFrame,
weak_factory_.GetWeakPtr(), frame_encoded_callback));
if (is_frame_accepted)
++frames_in_encoder_;
return is_frame_accepted;
}
void SizeAdaptableVideoEncoderBase::SetBitRate(int new_bit_rate) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
video_config_.start_bitrate = new_bit_rate;
if (encoder_)
encoder_->SetBitRate(new_bit_rate);
}
void SizeAdaptableVideoEncoderBase::GenerateKeyFrame() {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
if (encoder_)
encoder_->GenerateKeyFrame();
}
std::unique_ptr<VideoFrameFactory>
SizeAdaptableVideoEncoderBase::CreateVideoFrameFactory() {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
return nullptr;
}
void SizeAdaptableVideoEncoderBase::EmitFrames() {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
if (encoder_)
encoder_->EmitFrames();
}
StatusChangeCallback
SizeAdaptableVideoEncoderBase::CreateEncoderStatusChangeCallback() {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
return base::Bind(&SizeAdaptableVideoEncoderBase::OnEncoderStatusChange,
weak_factory_.GetWeakPtr());
}
void SizeAdaptableVideoEncoderBase::OnEncoderReplaced(
VideoEncoder* replacement_encoder) {}
void SizeAdaptableVideoEncoderBase::DestroyEncoder() {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
// The weak pointers are invalidated to prevent future calls back to |this|.
// This effectively cancels any of |encoder_|'s posted tasks that have not yet
// run.
weak_factory_.InvalidateWeakPtrs();
encoder_.reset();
}
void SizeAdaptableVideoEncoderBase::TrySpawningReplacementEncoder(
const gfx::Size& size_needed) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
// If prior frames are still encoding in the current encoder, let them finish
// first.
if (frames_in_encoder_ > 0) {
encoder_->EmitFrames();
// Check again, since EmitFrames() is a synchronous operation for some
// encoders.
if (frames_in_encoder_ > 0)
return;
}
if (frames_in_encoder_ == kEncoderIsInitializing)
return; // Already spawned.
DestroyEncoder();
frames_in_encoder_ = kEncoderIsInitializing;
OnEncoderStatusChange(STATUS_CODEC_REINIT_PENDING);
VLOG(1) << "Creating replacement video encoder (for frame size change from "
<< frame_size_.ToString() << " to "
<< size_needed.ToString() << ").";
frame_size_ = size_needed;
encoder_ = CreateEncoder();
DCHECK(encoder_);
}
void SizeAdaptableVideoEncoderBase::OnEncoderStatusChange(
OperationalStatus status) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
if (frames_in_encoder_ == kEncoderIsInitializing &&
status == STATUS_INITIALIZED) {
// Begin using the replacement encoder.
frames_in_encoder_ = 0;
OnEncoderReplaced(encoder_.get());
}
status_change_cb_.Run(status);
}
void SizeAdaptableVideoEncoderBase::OnEncodedVideoFrame(
const FrameEncodedCallback& frame_encoded_callback,
std::unique_ptr<SenderEncodedFrame> encoded_frame) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
--frames_in_encoder_;
DCHECK_GE(frames_in_encoder_, 0);
if (encoded_frame)
next_frame_id_ = encoded_frame->frame_id + 1;
frame_encoded_callback.Run(std::move(encoded_frame));
}
} // namespace cast
} // namespace media
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