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/*
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "api/video_codecs/video_decoder_software_fallback_wrapper.h"
#include <string>
#include <utility>
#include "absl/memory/memory.h"
#include "modules/video_coding/include/video_error_codes.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/system/fallthrough.h"
#include "rtc_base/trace_event.h"
namespace webrtc {
namespace {
class VideoDecoderSoftwareFallbackWrapper final : public VideoDecoder {
public:
VideoDecoderSoftwareFallbackWrapper(
std::unique_ptr<VideoDecoder> sw_fallback_decoder,
std::unique_ptr<VideoDecoder> hw_decoder);
~VideoDecoderSoftwareFallbackWrapper() override;
int32_t InitDecode(const VideoCodec* codec_settings,
int32_t number_of_cores) override;
int32_t Decode(const EncodedImage& input_image,
bool missing_frames,
const CodecSpecificInfo* codec_specific_info,
int64_t render_time_ms) override;
int32_t RegisterDecodeCompleteCallback(
DecodedImageCallback* callback) override;
int32_t Release() override;
bool PrefersLateDecoding() const override;
const char* ImplementationName() const override;
private:
bool InitFallbackDecoder();
int32_t InitHwDecoder();
VideoDecoder& active_decoder() const;
// Determines if we are trying to use the HW or SW decoder.
enum class DecoderType {
kNone,
kHardware,
kFallback,
} decoder_type_;
std::unique_ptr<VideoDecoder> hw_decoder_;
VideoCodec codec_settings_;
int32_t number_of_cores_;
const std::unique_ptr<VideoDecoder> fallback_decoder_;
const std::string fallback_implementation_name_;
DecodedImageCallback* callback_;
};
VideoDecoderSoftwareFallbackWrapper::VideoDecoderSoftwareFallbackWrapper(
std::unique_ptr<VideoDecoder> sw_fallback_decoder,
std::unique_ptr<VideoDecoder> hw_decoder)
: decoder_type_(DecoderType::kNone),
hw_decoder_(std::move(hw_decoder)),
fallback_decoder_(std::move(sw_fallback_decoder)),
fallback_implementation_name_(
std::string(fallback_decoder_->ImplementationName()) +
" (fallback from: " + hw_decoder_->ImplementationName() + ")"),
callback_(nullptr) {}
VideoDecoderSoftwareFallbackWrapper::~VideoDecoderSoftwareFallbackWrapper() =
default;
int32_t VideoDecoderSoftwareFallbackWrapper::InitDecode(
const VideoCodec* codec_settings,
int32_t number_of_cores) {
codec_settings_ = *codec_settings;
number_of_cores_ = number_of_cores;
int32_t status = InitHwDecoder();
if (status == WEBRTC_VIDEO_CODEC_OK) {
return WEBRTC_VIDEO_CODEC_OK;
}
RTC_DCHECK(decoder_type_ == DecoderType::kNone);
if (InitFallbackDecoder()) {
return WEBRTC_VIDEO_CODEC_OK;
}
return status;
}
int32_t VideoDecoderSoftwareFallbackWrapper::InitHwDecoder() {
RTC_DCHECK(decoder_type_ == DecoderType::kNone);
int32_t status = hw_decoder_->InitDecode(&codec_settings_, number_of_cores_);
if (status != WEBRTC_VIDEO_CODEC_OK) {
return status;
}
decoder_type_ = DecoderType::kHardware;
if (callback_)
hw_decoder_->RegisterDecodeCompleteCallback(callback_);
return status;
}
bool VideoDecoderSoftwareFallbackWrapper::InitFallbackDecoder() {
RTC_DCHECK(decoder_type_ == DecoderType::kNone ||
decoder_type_ == DecoderType::kHardware);
RTC_LOG(LS_WARNING) << "Decoder falling back to software decoding.";
int32_t status =
fallback_decoder_->InitDecode(&codec_settings_, number_of_cores_);
if (status != WEBRTC_VIDEO_CODEC_OK) {
RTC_LOG(LS_ERROR) << "Failed to initialize software-decoder fallback.";
return false;
}
if (decoder_type_ == DecoderType::kHardware) {
hw_decoder_->Release();
}
decoder_type_ = DecoderType::kFallback;
if (callback_)
fallback_decoder_->RegisterDecodeCompleteCallback(callback_);
return true;
}
int32_t VideoDecoderSoftwareFallbackWrapper::Decode(
const EncodedImage& input_image,
bool missing_frames,
const CodecSpecificInfo* codec_specific_info,
int64_t render_time_ms) {
TRACE_EVENT0("webrtc", "VideoDecoderSoftwareFallbackWrapper::Decode");
switch (decoder_type_) {
case DecoderType::kNone:
return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
case DecoderType::kHardware: {
int32_t ret = WEBRTC_VIDEO_CODEC_FALLBACK_SOFTWARE;
ret = hw_decoder_->Decode(input_image, missing_frames,
codec_specific_info, render_time_ms);
if (ret != WEBRTC_VIDEO_CODEC_FALLBACK_SOFTWARE) {
return ret;
}
// HW decoder returned WEBRTC_VIDEO_CODEC_FALLBACK_SOFTWARE or
// initialization failed, fallback to software.
if (!InitFallbackDecoder()) {
return ret;
}
// Fallback decoder initialized, fall-through.
RTC_FALLTHROUGH();
}
case DecoderType::kFallback:
return fallback_decoder_->Decode(input_image, missing_frames,
codec_specific_info, render_time_ms);
default:
RTC_NOTREACHED();
return WEBRTC_VIDEO_CODEC_ERROR;
}
}
int32_t VideoDecoderSoftwareFallbackWrapper::RegisterDecodeCompleteCallback(
DecodedImageCallback* callback) {
callback_ = callback;
return active_decoder().RegisterDecodeCompleteCallback(callback);
}
int32_t VideoDecoderSoftwareFallbackWrapper::Release() {
int32_t status;
switch (decoder_type_) {
case DecoderType::kHardware:
status = hw_decoder_->Release();
break;
case DecoderType::kFallback:
RTC_LOG(LS_INFO) << "Releasing software fallback decoder.";
status = fallback_decoder_->Release();
break;
case DecoderType::kNone:
status = WEBRTC_VIDEO_CODEC_OK;
break;
default:
RTC_NOTREACHED();
status = WEBRTC_VIDEO_CODEC_ERROR;
}
decoder_type_ = DecoderType::kNone;
return status;
}
bool VideoDecoderSoftwareFallbackWrapper::PrefersLateDecoding() const {
return active_decoder().PrefersLateDecoding();
}
const char* VideoDecoderSoftwareFallbackWrapper::ImplementationName() const {
return decoder_type_ == DecoderType::kFallback
? fallback_implementation_name_.c_str()
: hw_decoder_->ImplementationName();
}
VideoDecoder& VideoDecoderSoftwareFallbackWrapper::active_decoder() const {
return decoder_type_ == DecoderType::kFallback ? *fallback_decoder_
: *hw_decoder_;
}
} // namespace
std::unique_ptr<VideoDecoder> CreateVideoDecoderSoftwareFallbackWrapper(
std::unique_ptr<VideoDecoder> sw_fallback_decoder,
std::unique_ptr<VideoDecoder> hw_decoder) {
return absl::make_unique<VideoDecoderSoftwareFallbackWrapper>(
std::move(sw_fallback_decoder), std::move(hw_decoder));
}
} // namespace webrtc
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