1 files changed, 286 insertions, 0 deletions
diff --git a/dom/media/platforms/PlatformEncoderModule.h b/dom/media/platforms/PlatformEncoderModule.h
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+++ b/dom/media/platforms/PlatformEncoderModule.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if !defined(PlatformEncoderModule_h_)
+#  define PlatformEncoderModule_h_
+
+#  include "MediaData.h"
+#  include "MediaInfo.h"
+#  include "MediaResult.h"
+#  include "mozilla/Attributes.h"
+#  include "mozilla/Maybe.h"
+#  include "mozilla/MozPromise.h"
+#  include "mozilla/RefPtr.h"
+#  include "mozilla/TaskQueue.h"
+#  include "mozilla/dom/ImageBitmapBinding.h"
+#  include "nsISupportsImpl.h"
+
+namespace mozilla {
+
+class MediaDataEncoder;
+struct CreateEncoderParams;
+
+class PlatformEncoderModule {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(PlatformEncoderModule)
+
+  virtual already_AddRefed<MediaDataEncoder> CreateVideoEncoder(
+      const CreateEncoderParams& aParams) const {
+    return nullptr;
+  };
+
+  virtual already_AddRefed<MediaDataEncoder> CreateAudioEncoder(
+      const CreateEncoderParams& aParams) const {
+    return nullptr;
+  };
+
+  // Indicates if the PlatformDecoderModule supports encoding of aMimeType.
+  virtual bool SupportsMimeType(const nsACString& aMimeType) const = 0;
+
+ protected:
+  PlatformEncoderModule() = default;
+  virtual ~PlatformEncoderModule() = default;
+  ;
+};
+
+class MediaDataEncoder {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MediaDataEncoder)
+
+  enum class Usage {
+    Realtime,  // For WebRTC
+    Record     // For MediaRecoder
+  };
+
+  enum class CodecType {
+    _BeginVideo_,
+    H264,
+    VP8,
+    VP9,
+    _EndVideo_,
+    _BeginAudio_ = _EndVideo_,
+    Opus,
+    G722,
+    _EndAudio_,
+  };
+
+  struct H264Specific final {
+    enum class ProfileLevel { BaselineAutoLevel, MainAutoLevel };
+
+    const size_t mKeyframeInterval;
+    const ProfileLevel mProfileLevel;
+
+    H264Specific(const size_t aKeyframeInterval,
+                 const ProfileLevel aProfileLevel)
+        : mKeyframeInterval(aKeyframeInterval), mProfileLevel(aProfileLevel) {}
+  };
+
+  struct OpusSpecific final {
+    enum class Application { Voip, Audio, RestricedLowDelay };
+
+    const Application mApplication;
+    const uint8_t mComplexity;  // from 0-10
+
+    OpusSpecific(const Application aApplication, const uint8_t aComplexity)
+        : mApplication(aApplication), mComplexity(aComplexity) {
+      MOZ_ASSERT(mComplexity <= 10);
+    }
+  };
+
+  static bool IsVideo(const CodecType aCodec) {
+    return aCodec > CodecType::_BeginVideo_ && aCodec < CodecType::_EndVideo_;
+  }
+  static bool IsAudio(const CodecType aCodec) {
+    return aCodec > CodecType::_BeginAudio_ && aCodec < CodecType::_EndAudio_;
+  }
+
+  using PixelFormat = dom::ImageBitmapFormat;
+  // Sample rate for audio, framerate for video, and bitrate for both.
+  using Rate = uint32_t;
+
+  using InitPromise =
+      MozPromise<TrackInfo::TrackType, MediaResult, /* IsExclusive = */ true>;
+  using EncodedData = nsTArray<RefPtr<MediaRawData>>;
+  using EncodePromise =
+      MozPromise<EncodedData, MediaResult, /* IsExclusive = */ true>;
+
+  // Initialize the encoder. It should be ready to encode once the returned
+  // promise resolves. The encoder should do any initialization here, rather
+  // than in its constructor or PlatformEncoderModule::Create*Encoder(),
+  // so that if the client needs to shutdown during initialization,
+  // it can call Shutdown() to cancel this operation. Any initialization
+  // that requires blocking the calling thread in this function *must*
+  // be done here so that it can be canceled by calling Shutdown()!
+  virtual RefPtr<InitPromise> Init() = 0;
+
+  // Inserts a sample into the encoder's encode pipeline. The EncodePromise it
+  // returns will be resolved with already encoded MediaRawData at the moment,
+  // or empty when there is none available yet.
+  virtual RefPtr<EncodePromise> Encode(const MediaData* aSample) = 0;
+
+  // Causes all complete samples in the pipeline that can be encoded to be
+  // output. It indicates that there is no more input sample to insert.
+  // This function is asynchronous.
+  // The MediaDataEncoder shall resolve the pending EncodePromise with drained
+  // samples. Drain will be called multiple times until the resolved
+  // EncodePromise is empty which indicates that there are no more samples to
+  // drain.
+  virtual RefPtr<EncodePromise> Drain() = 0;
+
+  // Cancels all init/encode/drain operations, and shuts down the encoder. The
+  // platform encoder should clean up any resources it's using and release
+  // memory etc. The shutdown promise will be resolved once the encoder has
+  // completed shutdown. The client will delete the decoder once the promise is
+  // resolved.
+  // The ShutdownPromise must only ever be resolved.
+  virtual RefPtr<ShutdownPromise> Shutdown() = 0;
+
+  virtual RefPtr<GenericPromise> SetBitrate(Rate aBitsPerSec) {
+    return GenericPromise::CreateAndResolve(true, __func__);
+  }
+
+  // Decoder needs to decide whether or not hardware acceleration is supported
+  // after creating. It doesn't need to call Init() before calling this
+  // function.
+  virtual bool IsHardwareAccelerated(nsACString& aFailureReason) const {
+    return false;
+  }
+
+  // Return the name of the MediaDataEncoder, only used for encoding.
+  // May be accessed in a non thread-safe fashion.
+  virtual nsCString GetDescriptionName() const = 0;
+
+  friend class PlatformEncoderModule;
+
+ protected:
+  template <typename T>
+  struct BaseConfig {
+    const CodecType mCodecType;
+    const Usage mUsage;
+    const Rate mBitsPerSec;
+    Maybe<T> mCodecSpecific;
+
+    void SetCodecSpecific(const T& aCodecSpecific) {
+      mCodecSpecific.emplace(aCodecSpecific);
+    }
+
+   protected:
+    BaseConfig(const CodecType aCodecType, const Usage aUsage,
+               const Rate aBitsPerSec)
+        : mCodecType(aCodecType), mUsage(aUsage), mBitsPerSec(aBitsPerSec) {}
+
+    virtual ~BaseConfig() = default;
+  };
+
+  template <typename T>
+  struct VideoConfig final : public BaseConfig<T> {
+    const gfx::IntSize mSize;
+    const PixelFormat mSourcePixelFormat;
+    const uint8_t mFramerate;
+    VideoConfig(const CodecType aCodecType, const Usage aUsage,
+                const gfx::IntSize& aSize, const PixelFormat aSourcePixelFormat,
+                const uint8_t aFramerate, const Rate aBitrate)
+        : BaseConfig<T>(aCodecType, aUsage, aBitrate),
+          mSize(aSize),
+          mSourcePixelFormat(aSourcePixelFormat),
+          mFramerate(aFramerate) {}
+  };
+
+  template <typename T>
+  struct AudioConfig final : public BaseConfig<T> {
+    const uint8_t mNumChannels;
+    const Rate mSampleRate;
+
+    AudioConfig(const CodecType aCodecType, const Usage aUsage,
+                const Rate aBitrate, const Rate aSampleRate,
+                const uint8_t aNumChannels)
+        : BaseConfig<T>(aCodecType, aUsage, aBitrate),
+          mNumChannels(aNumChannels),
+          mSampleRate(aSampleRate) {}
+  };
+
+  virtual ~MediaDataEncoder() = default;
+
+ public:
+  using H264Config = VideoConfig<H264Specific>;
+};
+
+struct MOZ_STACK_CLASS CreateEncoderParams final {
+  union CodecSpecific {
+    MediaDataEncoder::H264Specific mH264;
+    MediaDataEncoder::OpusSpecific mOpus;
+
+    explicit CodecSpecific(const MediaDataEncoder::H264Specific&& aH264)
+        : mH264(aH264) {}
+    explicit CodecSpecific(const MediaDataEncoder::OpusSpecific&& aOpus)
+        : mOpus(aOpus) {}
+  };
+
+  CreateEncoderParams(const TrackInfo& aConfig,
+                      const MediaDataEncoder::Usage aUsage,
+                      const RefPtr<TaskQueue> aTaskQueue,
+                      const MediaDataEncoder::PixelFormat aPixelFormat,
+                      const uint8_t aFramerate,
+                      const MediaDataEncoder::Rate aBitrate)
+      : mConfig(aConfig),
+        mUsage(aUsage),
+        mTaskQueue(aTaskQueue),
+        mPixelFormat(aPixelFormat),
+        mFramerate(aFramerate),
+        mBitrate(aBitrate) {
+    MOZ_ASSERT(mTaskQueue);
+  }
+
+  template <typename... Ts>
+  CreateEncoderParams(const TrackInfo& aConfig,
+                      const MediaDataEncoder::Usage aUsage,
+                      const RefPtr<TaskQueue> aTaskQueue,
+                      const MediaDataEncoder::PixelFormat aPixelFormat,
+                      const uint8_t aFramerate,
+                      const MediaDataEncoder::Rate aBitrate,
+                      const Ts&&... aCodecSpecific)
+      : mConfig(aConfig),
+        mUsage(aUsage),
+        mTaskQueue(aTaskQueue),
+        mPixelFormat(aPixelFormat),
+        mFramerate(aFramerate),
+        mBitrate(aBitrate) {
+    MOZ_ASSERT(mTaskQueue);
+    Set(std::forward<const Ts>(aCodecSpecific)...);
+  }
+
+  const MediaDataEncoder::H264Config ToH264Config() const {
+    const VideoInfo* info = mConfig.GetAsVideoInfo();
+    MOZ_ASSERT(info);
+
+    auto config = MediaDataEncoder::H264Config(
+        MediaDataEncoder::CodecType::H264, mUsage, info->mImage, mPixelFormat,
+        mFramerate, mBitrate);
+    if (mCodecSpecific) {
+      config.SetCodecSpecific(mCodecSpecific.ref().mH264);
+    }
+
+    return config;
+  }
+
+  const TrackInfo& mConfig;
+  const MediaDataEncoder::Usage mUsage;
+  const RefPtr<TaskQueue> mTaskQueue;
+  const MediaDataEncoder::PixelFormat mPixelFormat;
+  const uint8_t mFramerate;
+  const MediaDataEncoder::Rate mBitrate;
+  Maybe<CodecSpecific> mCodecSpecific;
+
+ private:
+  template <typename T>
+  void Set(const T&& aCodecSpecific) {
+    mCodecSpecific.emplace(std::forward<const T>(aCodecSpecific));
+  }
+};
+
+}  // namespace mozilla
+
+#endif /* PlatformEncoderModule_h_ */