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// Copyright 2018 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 <utility>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/threading/sequenced_task_runner_handle.h"
#include "media/base/decoder_buffer.h"
#include "media/base/fallback_video_decoder.h"
#include "media/base/video_decoder_config.h"
namespace media {
FallbackVideoDecoder::FallbackVideoDecoder(
std::unique_ptr<VideoDecoder> preferred,
std::unique_ptr<VideoDecoder> fallback)
: preferred_decoder_(std::move(preferred)),
fallback_decoder_(std::move(fallback)) {}
void FallbackVideoDecoder::Initialize(const VideoDecoderConfig& config,
bool low_delay,
CdmContext* cdm_context,
InitCB init_cb,
const OutputCB& output_cb,
const WaitingCB& waiting_cb) {
// If we've already fallen back, just reinitialize the selected decoder.
if (selected_decoder_ && did_fallback_) {
selected_decoder_->Initialize(config, low_delay, cdm_context,
std::move(init_cb), output_cb, waiting_cb);
return;
}
InitCB fallback_initialize_cb =
base::BindOnce(&FallbackVideoDecoder::FallbackInitialize,
weak_factory_.GetWeakPtr(), config, low_delay, cdm_context,
std::move(init_cb), output_cb, waiting_cb);
preferred_decoder_->Initialize(config, low_delay, cdm_context,
std::move(fallback_initialize_cb), output_cb,
waiting_cb);
}
void FallbackVideoDecoder::FallbackInitialize(const VideoDecoderConfig& config,
bool low_delay,
CdmContext* cdm_context,
InitCB init_cb,
const OutputCB& output_cb,
const WaitingCB& waiting_cb,
Status status) {
// The preferred decoder was successfully initialized.
if (status.is_ok()) {
selected_decoder_ = preferred_decoder_.get();
std::move(init_cb).Run(OkStatus());
return;
}
did_fallback_ = true;
// Post destruction of |preferred_decoder_| so that we don't destroy the
// object during the callback. DeleteSoon doesn't handle custom deleters, so
// we post a do-nothing task instead.
base::SequencedTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::BindOnce(base::DoNothing::Once<std::unique_ptr<VideoDecoder>>(),
std::move(preferred_decoder_)));
selected_decoder_ = fallback_decoder_.get();
fallback_decoder_->Initialize(config, low_delay, cdm_context,
std::move(init_cb), output_cb, waiting_cb);
}
void FallbackVideoDecoder::Decode(scoped_refptr<DecoderBuffer> buffer,
DecodeCB decode_cb) {
DCHECK(selected_decoder_);
selected_decoder_->Decode(std::move(buffer), std::move(decode_cb));
}
void FallbackVideoDecoder::Reset(base::OnceClosure reset_cb) {
DCHECK(selected_decoder_);
selected_decoder_->Reset(std::move(reset_cb));
}
bool FallbackVideoDecoder::NeedsBitstreamConversion() const {
DCHECK(selected_decoder_);
return selected_decoder_->NeedsBitstreamConversion();
}
bool FallbackVideoDecoder::CanReadWithoutStalling() const {
DCHECK(selected_decoder_);
return selected_decoder_->CanReadWithoutStalling();
}
int FallbackVideoDecoder::GetMaxDecodeRequests() const {
DCHECK(selected_decoder_);
return selected_decoder_->GetMaxDecodeRequests();
}
std::string FallbackVideoDecoder::GetDisplayName() const {
// MojoVideoDecoder always identifies itself as such, and never asks for the
// name of the underlying decoder.
NOTREACHED();
return "FallbackVideoDecoder";
}
FallbackVideoDecoder::~FallbackVideoDecoder() = default;
} // namespace media
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