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// Copyright 2013 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 "third_party/blink/renderer/platform/peerconnection/rtc_video_decoder_factory.h"
#include <array>
#include <memory>
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "build/build_config.h"
#include "media/base/media_util.h"
#include "media/base/video_codecs.h"
#include "media/video/gpu_video_accelerator_factories.h"
#include "third_party/blink/renderer/platform/peerconnection/rtc_video_decoder_adapter.h"
#include "third_party/webrtc/media/base/h264_profile_level_id.h"
#include "third_party/webrtc/media/base/media_constants.h"
#include "third_party/webrtc/media/base/vp9_profile.h"
#include "ui/gfx/color_space.h"
#include "ui/gfx/geometry/size.h"
namespace blink {
namespace {
const int kDefaultFps = 30;
// Any reasonable size, will be overridden by the decoder anyway.
const gfx::Size kDefaultSize(640, 480);
struct CodecConfig {
media::VideoCodec codec;
media::VideoCodecProfile profile;
};
constexpr std::array<CodecConfig, 7> kCodecConfigs = {{
{media::kCodecVP8, media::VP8PROFILE_ANY},
{media::kCodecVP9, media::VP9PROFILE_PROFILE0},
{media::kCodecVP9, media::VP9PROFILE_PROFILE1},
{media::kCodecVP9, media::VP9PROFILE_PROFILE2},
{media::kCodecH264, media::H264PROFILE_BASELINE},
{media::kCodecH264, media::H264PROFILE_MAIN},
{media::kCodecH264, media::H264PROFILE_HIGH},
}};
// Translate from media::VideoDecoderConfig to webrtc::SdpVideoFormat, or return
// nothing if the profile isn't supported.
base::Optional<webrtc::SdpVideoFormat> VdcToWebRtcFormat(
const media::VideoDecoderConfig& config) {
switch (config.codec()) {
case media::VideoCodec::kCodecVP8:
return webrtc::SdpVideoFormat("VP8");
case media::VideoCodec::kCodecVP9: {
webrtc::VP9Profile vp9_profile;
switch (config.profile()) {
case media::VP9PROFILE_PROFILE0:
vp9_profile = webrtc::VP9Profile::kProfile0;
break;
case media::VP9PROFILE_PROFILE1:
vp9_profile = webrtc::VP9Profile::kProfile1;
break;
case media::VP9PROFILE_PROFILE2:
vp9_profile = webrtc::VP9Profile::kProfile2;
break;
default:
// Unsupported profile in WebRTC.
return base::nullopt;
}
return webrtc::SdpVideoFormat(
"VP9", {{webrtc::kVP9FmtpProfileId,
webrtc::VP9ProfileToString(vp9_profile)}});
}
case media::VideoCodec::kCodecH264: {
webrtc::H264::Profile h264_profile;
switch (config.profile()) {
case media::H264PROFILE_BASELINE:
h264_profile = webrtc::H264::kProfileBaseline;
break;
case media::H264PROFILE_MAIN:
h264_profile = webrtc::H264::kProfileMain;
break;
case media::H264PROFILE_HIGH:
h264_profile = webrtc::H264::kProfileHigh;
break;
default:
// Unsupported H264 profile in WebRTC.
return base::nullopt;
}
const int width = config.visible_rect().width();
const int height = config.visible_rect().height();
const absl::optional<webrtc::H264::Level> h264_level =
webrtc::H264::SupportedLevel(width * height, kDefaultFps);
const webrtc::H264::ProfileLevelId profile_level_id(
h264_profile, h264_level.value_or(webrtc::H264::kLevel1));
webrtc::SdpVideoFormat format("H264");
format.parameters = {
{cricket::kH264FmtpProfileLevelId,
*webrtc::H264::ProfileLevelIdToString(profile_level_id)},
{cricket::kH264FmtpLevelAsymmetryAllowed, "1"},
{cricket::kH264FmtpPacketizationMode, "1"}};
return format;
}
default:
return base::nullopt;
}
}
// Due to https://crbug.com/345569, HW decoders do not distinguish between
// Constrained Baseline(CBP) and Baseline(BP) profiles. Since CBP is a subset of
// BP, we can report support for both. It is safe to do so when SW fallback is
// available.
// TODO(emircan): Remove this when the bug referred above is fixed.
void MapBaselineProfile(
std::vector<webrtc::SdpVideoFormat>* supported_formats) {
for (const auto& format : *supported_formats) {
const absl::optional<webrtc::H264::ProfileLevelId> profile_level_id =
webrtc::H264::ParseSdpProfileLevelId(format.parameters);
if (profile_level_id &&
profile_level_id->profile == webrtc::H264::kProfileBaseline) {
webrtc::SdpVideoFormat cbp_format = format;
webrtc::H264::ProfileLevelId cbp_profile = *profile_level_id;
cbp_profile.profile = webrtc::H264::kProfileConstrainedBaseline;
cbp_format.parameters[cricket::kH264FmtpProfileLevelId] =
*webrtc::H264::ProfileLevelIdToString(cbp_profile);
supported_formats->push_back(cbp_format);
return;
}
}
}
// This extra indirection is needed so that we can delete the decoder on the
// correct thread.
class ScopedVideoDecoder : public webrtc::VideoDecoder {
public:
ScopedVideoDecoder(
const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
std::unique_ptr<webrtc::VideoDecoder> decoder)
: task_runner_(task_runner), decoder_(std::move(decoder)) {}
int32_t InitDecode(const webrtc::VideoCodec* codec_settings,
int32_t number_of_cores) override {
return decoder_->InitDecode(codec_settings, number_of_cores);
}
int32_t RegisterDecodeCompleteCallback(
webrtc::DecodedImageCallback* callback) override {
return decoder_->RegisterDecodeCompleteCallback(callback);
}
int32_t Release() override { return decoder_->Release(); }
int32_t Decode(const webrtc::EncodedImage& input_image,
bool missing_frames,
int64_t render_time_ms) override {
return decoder_->Decode(input_image, missing_frames, render_time_ms);
}
bool PrefersLateDecoding() const override {
return decoder_->PrefersLateDecoding();
}
const char* ImplementationName() const override {
return decoder_->ImplementationName();
}
// Runs on Chrome_libJingle_WorkerThread. The child thread is blocked while
// this runs.
~ScopedVideoDecoder() override {
task_runner_->DeleteSoon(FROM_HERE, decoder_.release());
}
private:
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
std::unique_ptr<webrtc::VideoDecoder> decoder_;
};
} // namespace
RTCVideoDecoderFactory::RTCVideoDecoderFactory(
media::GpuVideoAcceleratorFactories* gpu_factories)
: gpu_factories_(gpu_factories) {
DVLOG(2) << __func__;
}
std::vector<webrtc::SdpVideoFormat>
RTCVideoDecoderFactory::GetSupportedFormats() const {
std::vector<webrtc::SdpVideoFormat> supported_formats;
for (auto& codec_config : kCodecConfigs) {
media::VideoDecoderConfig config(
codec_config.codec, codec_config.profile,
media::VideoDecoderConfig::AlphaMode::kIsOpaque,
media::VideoColorSpace(), media::kNoTransformation, kDefaultSize,
gfx::Rect(kDefaultSize), kDefaultSize, media::EmptyExtraData(),
media::EncryptionScheme::kUnencrypted);
for (auto impl : RTCVideoDecoderAdapter::SupportedImplementations()) {
if (gpu_factories_->IsDecoderConfigSupported(impl, config) ==
media::GpuVideoAcceleratorFactories::Supported::kTrue) {
base::Optional<webrtc::SdpVideoFormat> format =
VdcToWebRtcFormat(config);
if (format) {
supported_formats.push_back(*format);
}
break;
}
}
}
MapBaselineProfile(&supported_formats);
return supported_formats;
}
RTCVideoDecoderFactory::~RTCVideoDecoderFactory() {
DVLOG(2) << __func__;
}
std::unique_ptr<webrtc::VideoDecoder>
RTCVideoDecoderFactory::CreateVideoDecoder(
const webrtc::SdpVideoFormat& format) {
DVLOG(2) << __func__;
std::unique_ptr<webrtc::VideoDecoder> decoder =
RTCVideoDecoderAdapter::Create(gpu_factories_, format);
// ScopedVideoDecoder uses the task runner to make sure the decoder is
// destructed on the correct thread.
return decoder ? std::make_unique<ScopedVideoDecoder>(
gpu_factories_->GetTaskRunner(), std::move(decoder))
: nullptr;
}
} // namespace blink
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