1 files changed, 278 insertions, 0 deletions
diff --git a/dom/media/platforms/agnostic/BlankDecoderModule.cpp b/dom/media/platforms/agnostic/BlankDecoderModule.cpp
new file mode 100644
index 000000000..7d7bae721
--- /dev/null
+++ b/dom/media/platforms/agnostic/BlankDecoderModule.cpp
@@ -0,0 +1,278 @@
+/* -*- 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/. */
+
+#include "ImageContainer.h"
+#include "MediaDecoderReader.h"
+#include "MediaInfo.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/mozalloc.h" // for operator new, and new (fallible)
+#include "mozilla/RefPtr.h"
+#include "mozilla/TaskQueue.h"
+#include "mp4_demuxer/AnnexB.h"
+#include "mp4_demuxer/H264.h"
+#include "MP4Decoder.h"
+#include "nsAutoPtr.h"
+#include "nsRect.h"
+#include "PlatformDecoderModule.h"
+#include "ReorderQueue.h"
+#include "TimeUnits.h"
+#include "VideoUtils.h"
+
+namespace mozilla {
+
+// Decoder that uses a passed in object's Create function to create blank
+// MediaData objects.
+template<class BlankMediaDataCreator>
+class BlankMediaDataDecoder : public MediaDataDecoder {
+public:
+
+  BlankMediaDataDecoder(BlankMediaDataCreator* aCreator,
+                        const CreateDecoderParams& aParams)
+    : mCreator(aCreator)
+    , mCallback(aParams.mCallback)
+    , mMaxRefFrames(aParams.mConfig.GetType() == TrackInfo::kVideoTrack &&
+                    MP4Decoder::IsH264(aParams.mConfig.mMimeType)
+                    ? mp4_demuxer::AnnexB::HasSPS(aParams.VideoConfig().mExtraData)
+                      ? mp4_demuxer::H264::ComputeMaxRefFrames(aParams.VideoConfig().mExtraData)
+                      : 16
+                    : 0)
+    , mType(aParams.mConfig.GetType())
+  {
+  }
+
+  RefPtr<InitPromise> Init() override {
+    return InitPromise::CreateAndResolve(mType, __func__);
+  }
+
+  void Shutdown() override {}
+
+  void Input(MediaRawData* aSample) override
+  {
+    RefPtr<MediaData> data =
+      mCreator->Create(media::TimeUnit::FromMicroseconds(aSample->mTime),
+                       media::TimeUnit::FromMicroseconds(aSample->mDuration),
+                       aSample->mOffset);
+
+    OutputFrame(data);
+  }
+
+  void Flush() override
+  {
+    mReorderQueue.Clear();
+  }
+
+  void Drain() override
+  {
+    while (!mReorderQueue.IsEmpty()) {
+      mCallback->Output(mReorderQueue.Pop().get());
+    }
+
+    mCallback->DrainComplete();
+  }
+
+  const char* GetDescriptionName() const override
+  {
+    return "blank media data decoder";
+  }
+
+private:
+  void OutputFrame(MediaData* aData)
+  {
+    if (!aData) {
+      mCallback->Error(MediaResult(NS_ERROR_OUT_OF_MEMORY, __func__));
+      return;
+    }
+
+    // Frames come out in DTS order but we need to output them in PTS order.
+    mReorderQueue.Push(aData);
+
+    while (mReorderQueue.Length() > mMaxRefFrames) {
+      mCallback->Output(mReorderQueue.Pop().get());
+    }
+    mCallback->InputExhausted();
+  }
+
+private:
+  nsAutoPtr<BlankMediaDataCreator> mCreator;
+  MediaDataDecoderCallback* mCallback;
+  const uint32_t mMaxRefFrames;
+  ReorderQueue mReorderQueue;
+  TrackInfo::TrackType mType;
+};
+
+class BlankVideoDataCreator {
+public:
+  BlankVideoDataCreator(uint32_t aFrameWidth,
+                        uint32_t aFrameHeight,
+                        layers::ImageContainer* aImageContainer)
+    : mFrameWidth(aFrameWidth)
+    , mFrameHeight(aFrameHeight)
+    , mImageContainer(aImageContainer)
+  {
+    mInfo.mDisplay = nsIntSize(mFrameWidth, mFrameHeight);
+    mPicture = gfx::IntRect(0, 0, mFrameWidth, mFrameHeight);
+  }
+
+  already_AddRefed<MediaData>
+  Create(const media::TimeUnit& aDTS, const media::TimeUnit& aDuration, int64_t aOffsetInStream)
+  {
+    // Create a fake YUV buffer in a 420 format. That is, an 8bpp Y plane,
+    // with a U and V plane that are half the size of the Y plane, i.e 8 bit,
+    // 2x2 subsampled.
+    const int sizeY = mFrameWidth * mFrameHeight;
+    const int sizeCbCr = ((mFrameWidth + 1) / 2) * ((mFrameHeight + 1) / 2);
+    auto frame = MakeUnique<uint8_t[]>(sizeY + sizeCbCr);
+    VideoData::YCbCrBuffer buffer;
+
+    // Y plane.
+    buffer.mPlanes[0].mData = frame.get();
+    buffer.mPlanes[0].mStride = mFrameWidth;
+    buffer.mPlanes[0].mHeight = mFrameHeight;
+    buffer.mPlanes[0].mWidth = mFrameWidth;
+    buffer.mPlanes[0].mOffset = 0;
+    buffer.mPlanes[0].mSkip = 0;
+
+    // Cb plane.
+    buffer.mPlanes[1].mData = frame.get() + sizeY;
+    buffer.mPlanes[1].mStride = mFrameWidth / 2;
+    buffer.mPlanes[1].mHeight = mFrameHeight / 2;
+    buffer.mPlanes[1].mWidth = mFrameWidth / 2;
+    buffer.mPlanes[1].mOffset = 0;
+    buffer.mPlanes[1].mSkip = 0;
+
+    // Cr plane.
+    buffer.mPlanes[2].mData = frame.get() + sizeY;
+    buffer.mPlanes[2].mStride = mFrameWidth / 2;
+    buffer.mPlanes[2].mHeight = mFrameHeight / 2;
+    buffer.mPlanes[2].mWidth = mFrameWidth / 2;
+    buffer.mPlanes[2].mOffset = 0;
+    buffer.mPlanes[2].mSkip = 0;
+
+    // Set to color white.
+    memset(buffer.mPlanes[0].mData, 255, sizeY);
+    memset(buffer.mPlanes[1].mData, 128, sizeCbCr);
+
+    return VideoData::CreateAndCopyData(mInfo,
+                                        mImageContainer,
+                                        aOffsetInStream,
+                                        aDTS.ToMicroseconds(),
+                                        aDuration.ToMicroseconds(),
+                                        buffer,
+                                        true,
+                                        aDTS.ToMicroseconds(),
+                                        mPicture);
+  }
+
+private:
+  VideoInfo mInfo;
+  gfx::IntRect mPicture;
+  uint32_t mFrameWidth;
+  uint32_t mFrameHeight;
+  RefPtr<layers::ImageContainer> mImageContainer;
+};
+
+class BlankAudioDataCreator {
+public:
+  BlankAudioDataCreator(uint32_t aChannelCount, uint32_t aSampleRate)
+    : mFrameSum(0), mChannelCount(aChannelCount), mSampleRate(aSampleRate)
+  {
+  }
+
+  MediaData* Create(const media::TimeUnit& aDTS,
+                    const media::TimeUnit& aDuration,
+                    int64_t aOffsetInStream)
+  {
+    // Convert duration to frames. We add 1 to duration to account for
+    // rounding errors, so we get a consistent tone.
+    CheckedInt64 frames =
+      UsecsToFrames(aDuration.ToMicroseconds()+1, mSampleRate);
+    if (!frames.isValid() ||
+        !mChannelCount ||
+        !mSampleRate ||
+        frames.value() > (UINT32_MAX / mChannelCount)) {
+      return nullptr;
+    }
+    AlignedAudioBuffer samples(frames.value() * mChannelCount);
+    if (!samples) {
+      return nullptr;
+    }
+    // Fill the sound buffer with an A4 tone.
+    static const float pi = 3.14159265f;
+    static const float noteHz = 440.0f;
+    for (int i = 0; i < frames.value(); i++) {
+      float f = sin(2 * pi * noteHz * mFrameSum / mSampleRate);
+      for (unsigned c = 0; c < mChannelCount; c++) {
+        samples[i * mChannelCount + c] = AudioDataValue(f);
+      }
+      mFrameSum++;
+    }
+    return new AudioData(aOffsetInStream,
+                         aDTS.ToMicroseconds(),
+                         aDuration.ToMicroseconds(),
+                         uint32_t(frames.value()),
+                         Move(samples),
+                         mChannelCount,
+                         mSampleRate);
+  }
+
+private:
+  int64_t mFrameSum;
+  uint32_t mChannelCount;
+  uint32_t mSampleRate;
+};
+
+class BlankDecoderModule : public PlatformDecoderModule {
+public:
+
+  // Decode thread.
+  already_AddRefed<MediaDataDecoder>
+  CreateVideoDecoder(const CreateDecoderParams& aParams) override {
+    const VideoInfo& config = aParams.VideoConfig();
+    BlankVideoDataCreator* creator = new BlankVideoDataCreator(
+      config.mDisplay.width, config.mDisplay.height, aParams.mImageContainer);
+    RefPtr<MediaDataDecoder> decoder =
+      new BlankMediaDataDecoder<BlankVideoDataCreator>(creator, aParams);
+    return decoder.forget();
+  }
+
+  // Decode thread.
+  already_AddRefed<MediaDataDecoder>
+  CreateAudioDecoder(const CreateDecoderParams& aParams) override {
+    const AudioInfo& config = aParams.AudioConfig();
+    BlankAudioDataCreator* creator = new BlankAudioDataCreator(
+      config.mChannels, config.mRate);
+
+    RefPtr<MediaDataDecoder> decoder =
+      new BlankMediaDataDecoder<BlankAudioDataCreator>(creator, aParams);
+    return decoder.forget();
+  }
+
+  bool
+  SupportsMimeType(const nsACString& aMimeType,
+                   DecoderDoctorDiagnostics* aDiagnostics) const override
+  {
+    return true;
+  }
+
+  ConversionRequired
+  DecoderNeedsConversion(const TrackInfo& aConfig) const override
+  {
+    if (aConfig.IsVideo() && MP4Decoder::IsH264(aConfig.mMimeType)) {
+      return ConversionRequired::kNeedAVCC;
+    } else {
+      return ConversionRequired::kNeedNone;
+    }
+  }
+
+};
+
+already_AddRefed<PlatformDecoderModule> CreateBlankDecoderModule()
+{
+  RefPtr<PlatformDecoderModule> pdm = new BlankDecoderModule();
+  return pdm.forget();
+}
+
+} // namespace mozilla