--- a/dom/media/MediaDecoderReader.h
+++ b/dom/media/MediaDecoderReader.h
@@ -147,24 +147,16 @@ public:
   // they notify the state machine when the data arrives.
   virtual bool IsWaitForDataSupported() const { return false; }
 
   virtual RefPtr<WaitForDataPromise> WaitForData(MediaData::Type aType)
   {
     MOZ_CRASH();
   }
 
-  // By default, the reader return the decoded data. Some readers support
-  // retuning demuxed data.
-  virtual bool IsDemuxOnlySupported() const { return false; }
-
-  // Configure the reader to return demuxed or decoded data
-  // upon calls to Request{Audio,Video}Data.
-  virtual void SetDemuxOnly(bool /*aDemuxedOnly*/) {}
-
   // The default implementation of AsyncReadMetadata is implemented in terms of
   // synchronous ReadMetadata() calls. Implementations may also
   // override AsyncReadMetadata to create a more proper async implementation.
   virtual RefPtr<MetadataPromise> AsyncReadMetadata();
 
   // Fills aInfo with the latest cached data required to present the media,
   // ReadUpdatedMetadata will always be called once ReadMetadata has succeeded.
   virtual void ReadUpdatedMetadata(MediaInfo* aInfo) {}

--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -482,23 +482,23 @@ public:
 
   State GetState() const override
   {
     return DECODER_STATE_DECODING_FIRSTFRAME;
   }
 
   void HandleAudioDecoded(MediaData* aAudio) override
   {
-    mMaster->Push(aAudio, MediaData::AUDIO_DATA);
+    mMaster->Push(aAudio);
     MaybeFinishDecodeFirstFrame();
   }
 
   void HandleVideoDecoded(MediaData* aVideo, TimeStamp aDecodeStart) override
   {
-    mMaster->Push(aVideo, MediaData::VIDEO_DATA);
+    mMaster->Push(aVideo);
     MaybeFinishDecodeFirstFrame();
   }
 
   void HandleEndOfStream() override
   {
     MaybeFinishDecodeFirstFrame();
   }
 
@@ -579,23 +579,23 @@ public:
 
   State GetState() const override
   {
     return DECODER_STATE_DECODING;
   }
 
   void HandleAudioDecoded(MediaData* aAudio) override
   {
-    mMaster->Push(aAudio, MediaData::AUDIO_DATA);
+    mMaster->Push(aAudio);
     MaybeStopPrerolling();
   }
 
   void HandleVideoDecoded(MediaData* aVideo, TimeStamp aDecodeStart) override
   {
-    mMaster->Push(aVideo, MediaData::VIDEO_DATA);
+    mMaster->Push(aVideo);
     MaybeStopPrerolling();
     CheckSlowDecoding(aDecodeStart);
   }
 
   void HandleEndOfStream() override;
 
   void HandleWaitingForData() override
   {
@@ -873,23 +873,23 @@ public:
   }
 
 private:
   void OnSeekTaskResolved(const SeekTaskResolveValue& aValue)
   {
     mSeekTaskRequest.Complete();
 
     if (aValue.mSeekedAudioData) {
-      mMaster->Push(aValue.mSeekedAudioData, MediaData::AUDIO_DATA);
+      mMaster->Push(aValue.mSeekedAudioData);
       mMaster->mDecodedAudioEndTime = std::max(
         aValue.mSeekedAudioData->GetEndTime(), mMaster->mDecodedAudioEndTime);
     }
 
     if (aValue.mSeekedVideoData) {
-      mMaster->Push(aValue.mSeekedVideoData, MediaData::VIDEO_DATA);
+      mMaster->Push(aValue.mSeekedVideoData);
       mMaster->mDecodedVideoEndTime = std::max(
         aValue.mSeekedVideoData->GetEndTime(), mMaster->mDecodedVideoEndTime);
     }
 
     if (aValue.mIsAudioQueueFinished) {
       AudioQueue().Finish();
     }
 
@@ -962,25 +962,25 @@ public:
   {
     return DECODER_STATE_BUFFERING;
   }
 
   void HandleAudioDecoded(MediaData* aAudio) override
   {
     // This might be the sample we need to exit buffering.
     // Schedule Step() to check it.
-    mMaster->Push(aAudio, MediaData::AUDIO_DATA);
+    mMaster->Push(aAudio);
     mMaster->ScheduleStateMachine();
   }
 
   void HandleVideoDecoded(MediaData* aVideo, TimeStamp aDecodeStart) override
   {
     // This might be the sample we need to exit buffering.
     // Schedule Step() to check it.
-    mMaster->Push(aVideo, MediaData::VIDEO_DATA);
+    mMaster->Push(aVideo);
     mMaster->ScheduleStateMachine();
   }
 
   void HandleEndOfStream() override;
 
   void HandleVideoSuspendTimeout() override
   {
     if (mMaster->HasVideo()) {
@@ -1925,35 +1925,34 @@ MediaDecoderStateMachine::OnAudioDecoded
   mDecodedAudioEndTime = std::max(aAudio->GetEndTime(), mDecodedAudioEndTime);
 
   SAMPLE_LOG("OnAudioDecoded [%lld,%lld]", aAudio->mTime, aAudio->GetEndTime());
 
   mStateObj->HandleAudioDecoded(aAudio);
 }
 
 void
-MediaDecoderStateMachine::Push(MediaData* aSample, MediaData::Type aSampleType)
+MediaDecoderStateMachine::Push(MediaData* aSample)
 {
   MOZ_ASSERT(OnTaskQueue());
   MOZ_ASSERT(aSample);
 
   if (aSample->mType == MediaData::AUDIO_DATA) {
     // TODO: Send aSample to MSG and recalculate readystate before pushing,
     // otherwise AdvanceFrame may pop the sample before we have a chance
     // to reach playing.
     AudioQueue().Push(aSample);
   } else if (aSample->mType == MediaData::VIDEO_DATA) {
     // TODO: Send aSample to MSG and recalculate readystate before pushing,
     // otherwise AdvanceFrame may pop the sample before we have a chance
     // to reach playing.
     aSample->As<VideoData>()->mFrameID = ++mCurrentFrameID;
     VideoQueue().Push(aSample);
-  } else {
-    // TODO: Handle MediaRawData, determine which queue should be pushed.
   }
+
   DispatchDecodeTasksIfNeeded();
 }
 
 void
 MediaDecoderStateMachine::OnAudioPopped(const RefPtr<MediaData>& aSample)
 {
   MOZ_ASSERT(OnTaskQueue());
 

--- a/dom/media/MediaDecoderStateMachine.h
+++ b/dom/media/MediaDecoderStateMachine.h
@@ -321,18 +321,16 @@ private:
 
   // True if shutdown process has begun.
   bool IsShutdown() const;
 
   // Returns true if we're currently playing. The decoder monitor must
   // be held.
   bool IsPlaying() const;
 
-  // TODO: Those callback function may receive demuxed-only data.
-  // Need to figure out a suitable API name for this case.
   void OnAudioDecoded(MediaData* aAudio);
   void OnVideoDecoded(MediaData* aVideo, TimeStamp aDecodeStartTime);
   void OnNotDecoded(MediaData::Type aType, const MediaResult& aError);
 
   // Resets all state related to decoding and playback, emptying all buffers
   // and aborting all pending operations on the decode task queue.
   void Reset(TrackSet aTracks = TrackSet(TrackInfo::kAudioTrack,
                                          TrackInfo::kVideoTrack));
@@ -341,18 +339,17 @@ protected:
   virtual ~MediaDecoderStateMachine();
 
   void BufferedRangeUpdated();
 
   void ReaderSuspendedChanged();
 
   // Inserts MediaData* samples into their respective MediaQueues.
   // aSample must not be null.
-
-  void Push(MediaData* aSample, MediaData::Type aSampleType);
+  void Push(MediaData* aSample);
 
   void OnAudioPopped(const RefPtr<MediaData>& aSample);
   void OnVideoPopped(const RefPtr<MediaData>& aSample);
 
   void AudioAudibleChanged(bool aAudible);
 
   void VolumeChanged();
   void SetPlaybackRate(double aPlaybackRate);

--- a/dom/media/MediaFormatReader.cpp
+++ b/dom/media/MediaFormatReader.cpp
@@ -432,17 +432,16 @@ MediaFormatReader::MediaFormatReader(Abs
   , mVideo(this, MediaData::VIDEO_DATA,
            Preferences::GetUint("media.video-max-decode-error", 2))
   , mDemuxer(aDemuxer)
   , mDemuxerInitDone(false)
   , mLastReportedNumDecodedFrames(0)
   , mPreviousDecodedKeyframeTime_us(sNoPreviousDecodedKeyframe)
   , mInitDone(false)
   , mTrackDemuxersMayBlock(false)
-  , mDemuxOnly(false)
   , mSeekScheduled(false)
   , mVideoFrameContainer(aVideoFrameContainer)
   , mDecoderFactory(new DecoderFactory(this))
 {
   MOZ_ASSERT(aDemuxer);
   MOZ_COUNT_CTOR(MediaFormatReader);
 
   if (aDecoder && aDecoder->CompositorUpdatedEvent()) {
@@ -1323,28 +1322,19 @@ MediaFormatReader::HandleDemuxedSamples(
          sample->mTime, sample->mTimecode, sample->mKeyframe);
     decoder.mOutputRequested = true;
     decoder.mNumSamplesInput++;
     decoder.mSizeOfQueue++;
     if (aTrack == TrackInfo::kVideoTrack) {
       aA.mStats.mParsedFrames++;
     }
 
-    if (mDemuxOnly) {
-      ReturnOutput(sample, aTrack);
-    } else {
-      DecodeDemuxedSamples(aTrack, sample);
-    }
+    DecodeDemuxedSamples(aTrack, sample);
 
     decoder.mQueuedSamples.RemoveElementAt(0);
-    if (mDemuxOnly) {
-      // If demuxed-only case, ReturnOutput will resolve with one demuxed data.
-      // Then we should stop doing the iteration.
-      return;
-    }
     samplesPending = true;
   }
 }
 
 void
 MediaFormatReader::InternalSeek(TrackType aTrack, const InternalSeekTarget& aTarget)
 {
   MOZ_ASSERT(OnTaskQueue());
@@ -1635,39 +1625,35 @@ void
 MediaFormatReader::ReturnOutput(MediaData* aData, TrackType aTrack)
 {
   MOZ_ASSERT(GetDecoderData(aTrack).HasPromise());
   MOZ_DIAGNOSTIC_ASSERT(aData->mType != MediaData::NULL_DATA);
   LOG("Resolved data promise for %s [%lld, %lld]", TrackTypeToStr(aTrack),
       aData->mTime, aData->GetEndTime());
 
   if (aTrack == TrackInfo::kAudioTrack) {
-    if (aData->mType != MediaData::RAW_DATA) {
-      AudioData* audioData = static_cast<AudioData*>(aData);
+    AudioData* audioData = static_cast<AudioData*>(aData);
 
-      if (audioData->mChannels != mInfo.mAudio.mChannels ||
-          audioData->mRate != mInfo.mAudio.mRate) {
-        LOG("change of audio format (rate:%d->%d). "
-            "This is an unsupported configuration",
-            mInfo.mAudio.mRate, audioData->mRate);
-        mInfo.mAudio.mRate = audioData->mRate;
-        mInfo.mAudio.mChannels = audioData->mChannels;
-      }
+    if (audioData->mChannels != mInfo.mAudio.mChannels ||
+        audioData->mRate != mInfo.mAudio.mRate) {
+      LOG("change of audio format (rate:%d->%d). "
+          "This is an unsupported configuration",
+          mInfo.mAudio.mRate, audioData->mRate);
+      mInfo.mAudio.mRate = audioData->mRate;
+      mInfo.mAudio.mChannels = audioData->mChannels;
     }
     mAudio.ResolvePromise(aData, __func__);
   } else if (aTrack == TrackInfo::kVideoTrack) {
-    if (aData->mType != MediaData::RAW_DATA) {
-      VideoData* videoData = static_cast<VideoData*>(aData);
+    VideoData* videoData = static_cast<VideoData*>(aData);
 
-      if (videoData->mDisplay != mInfo.mVideo.mDisplay) {
-        LOG("change of video display size (%dx%d->%dx%d)",
-            mInfo.mVideo.mDisplay.width, mInfo.mVideo.mDisplay.height,
-            videoData->mDisplay.width, videoData->mDisplay.height);
-        mInfo.mVideo.mDisplay = videoData->mDisplay;
-      }
+    if (videoData->mDisplay != mInfo.mVideo.mDisplay) {
+      LOG("change of video display size (%dx%d->%dx%d)",
+          mInfo.mVideo.mDisplay.width, mInfo.mVideo.mDisplay.height,
+          videoData->mDisplay.width, videoData->mDisplay.height);
+      mInfo.mVideo.mDisplay = videoData->mDisplay;
     }
     mVideo.ResolvePromise(aData, __func__);
   }
 }
 
 size_t
 MediaFormatReader::SizeOfVideoQueueInFrames()
 {

--- a/dom/media/MediaFormatReader.h
+++ b/dom/media/MediaFormatReader.h
@@ -69,30 +69,16 @@ public:
 
   bool IsAsync() const override { return true; }
 
   bool VideoIsHardwareAccelerated() const override;
 
   bool IsWaitForDataSupported() const override { return true; }
   RefPtr<WaitForDataPromise> WaitForData(MediaData::Type aType) override;
 
-  // MediaFormatReader supports demuxed-only mode.
-  bool IsDemuxOnlySupported() const override { return true; }
-
-  void SetDemuxOnly(bool aDemuxedOnly) override
-  {
-    if (OnTaskQueue()) {
-      mDemuxOnly = aDemuxedOnly;
-      return;
-    }
-    nsCOMPtr<nsIRunnable> r = NewRunnableMethod<bool>(
-      this, &MediaDecoderReader::SetDemuxOnly, aDemuxedOnly);
-    OwnerThread()->Dispatch(r.forget());
-  }
-
   bool UseBufferingHeuristics() const override
   {
     return mTrackDemuxersMayBlock;
   }
 
   void SetCDMProxy(CDMProxy* aProxy) override;
 
   // Returns a string describing the state of the decoder data.
@@ -543,19 +529,16 @@ private:
   // True if we've read the streams' metadata.
   bool mInitDone;
   MozPromiseHolder<MetadataPromise> mMetadataPromise;
   bool IsEncrypted() const;
 
   // Set to true if any of our track buffers may be blocking.
   bool mTrackDemuxersMayBlock;
 
-  // Set the demuxed-only flag.
-  Atomic<bool> mDemuxOnly;
-
   // Seeking objects.
   void SetSeekTarget(const SeekTarget& aTarget);
   bool IsSeeking() const { return mPendingSeekTime.isSome(); }
   bool IsVideoSeeking() const
   {
     return IsSeeking() && mOriginalSeekTarget.IsVideoOnly();
   }
   void ScheduleSeek();