Add m-esr52 at 52.6.0

1 files changed, 722 insertions, 0 deletions

diff --git a/dom/media/platforms/apple/AppleATDecoder.cpp b/dom/media/platforms/apple/AppleATDecoder.cpp
new file mode 100644
index 000000000..65794d82c
--- /dev/null
+++ b/dom/media/platforms/apple/AppleATDecoder.cpp
@@ -0,0 +1,722 @@
+/* -*- 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 "AppleUtils.h"
+#include "MP4Decoder.h"
+#include "mp4_demuxer/Adts.h"
+#include "MediaInfo.h"
+#include "AppleATDecoder.h"
+#include "mozilla/Logging.h"
+#include "mozilla/SyncRunnable.h"
+#include "mozilla/UniquePtr.h"
+
+#define LOG(...) MOZ_LOG(sPDMLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
+#define FourCC2Str(n) ((char[5]){(char)(n >> 24), (char)(n >> 16), (char)(n >> 8), (char)(n), 0})
+
+namespace mozilla {
+
+AppleATDecoder::AppleATDecoder(const AudioInfo& aConfig,
+                               TaskQueue* aTaskQueue,
+                               MediaDataDecoderCallback* aCallback)
+  : mConfig(aConfig)
+  , mFileStreamError(false)
+  , mTaskQueue(aTaskQueue)
+  , mCallback(aCallback)
+  , mConverter(nullptr)
+  , mStream(nullptr)
+  , mIsFlushing(false)
+  , mParsedFramesForAACMagicCookie(0)
+  , mErrored(false)
+{
+  MOZ_COUNT_CTOR(AppleATDecoder);
+  LOG("Creating Apple AudioToolbox decoder");
+  LOG("Audio Decoder configuration: %s %d Hz %d channels %d bits per channel",
+      mConfig.mMimeType.get(),
+      mConfig.mRate,
+      mConfig.mChannels,
+      mConfig.mBitDepth);
+
+  if (mConfig.mMimeType.EqualsLiteral("audio/mpeg")) {
+    mFormatID = kAudioFormatMPEGLayer3;
+  } else if (mConfig.mMimeType.EqualsLiteral("audio/mp4a-latm")) {
+    mFormatID = kAudioFormatMPEG4AAC;
+  } else {
+    mFormatID = 0;
+  }
+}
+
+AppleATDecoder::~AppleATDecoder()
+{
+  MOZ_COUNT_DTOR(AppleATDecoder);
+  MOZ_ASSERT(!mConverter);
+}
+
+RefPtr<MediaDataDecoder::InitPromise>
+AppleATDecoder::Init()
+{
+  if (!mFormatID) {
+    NS_ERROR("Non recognised format");
+    return InitPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_FATAL_ERR, __func__);
+  }
+
+  return InitPromise::CreateAndResolve(TrackType::kAudioTrack, __func__);
+}
+
+void
+AppleATDecoder::Input(MediaRawData* aSample)
+{
+  MOZ_ASSERT(mCallback->OnReaderTaskQueue());
+  LOG("mp4 input sample %p %lld us %lld pts%s %llu bytes audio",
+      aSample,
+      aSample->mDuration,
+      aSample->mTime,
+      aSample->mKeyframe ? " keyframe" : "",
+      (unsigned long long)aSample->Size());
+
+  // Queue a task to perform the actual decoding on a separate thread.
+  nsCOMPtr<nsIRunnable> runnable =
+      NewRunnableMethod<RefPtr<MediaRawData>>(
+        this,
+        &AppleATDecoder::SubmitSample,
+        RefPtr<MediaRawData>(aSample));
+  mTaskQueue->Dispatch(runnable.forget());
+}
+
+void
+AppleATDecoder::ProcessFlush()
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+  mQueuedSamples.Clear();
+  if (mConverter) {
+    OSStatus rv = AudioConverterReset(mConverter);
+    if (rv) {
+      LOG("Error %d resetting AudioConverter", rv);
+    }
+  }
+  if (mErrored) {
+    mParsedFramesForAACMagicCookie = 0;
+    mMagicCookie.Clear();
+    ProcessShutdown();
+    mErrored = false;
+  }
+}
+
+void
+AppleATDecoder::Flush()
+{
+  MOZ_ASSERT(mCallback->OnReaderTaskQueue());
+  LOG("Flushing AudioToolbox AAC decoder");
+  mIsFlushing = true;
+  nsCOMPtr<nsIRunnable> runnable =
+    NewRunnableMethod(this, &AppleATDecoder::ProcessFlush);
+  SyncRunnable::DispatchToThread(mTaskQueue, runnable);
+  mIsFlushing = false;
+}
+
+void
+AppleATDecoder::Drain()
+{
+  MOZ_ASSERT(mCallback->OnReaderTaskQueue());
+  LOG("Draining AudioToolbox AAC decoder");
+  mTaskQueue->AwaitIdle();
+  mCallback->DrainComplete();
+  Flush();
+}
+
+void
+AppleATDecoder::Shutdown()
+{
+  MOZ_ASSERT(mCallback->OnReaderTaskQueue());
+  nsCOMPtr<nsIRunnable> runnable =
+    NewRunnableMethod(this, &AppleATDecoder::ProcessShutdown);
+  SyncRunnable::DispatchToThread(mTaskQueue, runnable);
+}
+
+void
+AppleATDecoder::ProcessShutdown()
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+
+  if (mStream) {
+    OSStatus rv = AudioFileStreamClose(mStream);
+    if (rv) {
+      LOG("error %d disposing of AudioFileStream", rv);
+      return;
+    }
+    mStream = nullptr;
+  }
+
+  if (mConverter) {
+    LOG("Shutdown: Apple AudioToolbox AAC decoder");
+    OSStatus rv = AudioConverterDispose(mConverter);
+    if (rv) {
+      LOG("error %d disposing of AudioConverter", rv);
+    }
+    mConverter = nullptr;
+  }
+}
+
+struct PassthroughUserData {
+  UInt32 mChannels;
+  UInt32 mDataSize;
+  const void* mData;
+  AudioStreamPacketDescription mPacket;
+};
+
+// Error value we pass through the decoder to signal that nothing
+// has gone wrong during decoding and we're done processing the packet.
+const uint32_t kNoMoreDataErr = 'MOAR';
+
+static OSStatus
+_PassthroughInputDataCallback(AudioConverterRef aAudioConverter,
+                              UInt32* aNumDataPackets /* in/out */,
+                              AudioBufferList* aData /* in/out */,
+                              AudioStreamPacketDescription** aPacketDesc,
+                              void* aUserData)
+{
+  PassthroughUserData* userData = (PassthroughUserData*)aUserData;
+  if (!userData->mDataSize) {
+    *aNumDataPackets = 0;
+    return kNoMoreDataErr;
+  }
+
+  if (aPacketDesc) {
+    userData->mPacket.mStartOffset = 0;
+    userData->mPacket.mVariableFramesInPacket = 0;
+    userData->mPacket.mDataByteSize = userData->mDataSize;
+    *aPacketDesc = &userData->mPacket;
+  }
+
+  aData->mBuffers[0].mNumberChannels = userData->mChannels;
+  aData->mBuffers[0].mDataByteSize = userData->mDataSize;
+  aData->mBuffers[0].mData = const_cast<void*>(userData->mData);
+
+  // No more data to provide following this run.
+  userData->mDataSize = 0;
+
+  return noErr;
+}
+
+void
+AppleATDecoder::SubmitSample(MediaRawData* aSample)
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+
+  if (mIsFlushing) {
+    return;
+  }
+
+  MediaResult rv = NS_OK;
+  if (!mConverter) {
+    rv = SetupDecoder(aSample);
+    if (rv != NS_OK && rv != NS_ERROR_NOT_INITIALIZED) {
+      mCallback->Error(rv);
+      return;
+    }
+  }
+
+  mQueuedSamples.AppendElement(aSample);
+
+  if (rv == NS_OK) {
+    for (size_t i = 0; i < mQueuedSamples.Length(); i++) {
+      rv = DecodeSample(mQueuedSamples[i]);
+      if (NS_FAILED(rv)) {
+        mErrored = true;
+        mCallback->Error(rv);
+        return;
+      }
+    }
+    mQueuedSamples.Clear();
+  }
+  mCallback->InputExhausted();
+}
+
+MediaResult
+AppleATDecoder::DecodeSample(MediaRawData* aSample)
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+
+  // Array containing the queued decoded audio frames, about to be output.
+  nsTArray<AudioDataValue> outputData;
+  UInt32 channels = mOutputFormat.mChannelsPerFrame;
+  // Pick a multiple of the frame size close to a power of two
+  // for efficient allocation.
+  const uint32_t MAX_AUDIO_FRAMES = 128;
+  const uint32_t maxDecodedSamples = MAX_AUDIO_FRAMES * channels;
+
+  // Descriptions for _decompressed_ audio packets. ignored.
+  auto packets = MakeUnique<AudioStreamPacketDescription[]>(MAX_AUDIO_FRAMES);
+
+  // This API insists on having packets spoon-fed to it from a callback.
+  // This structure exists only to pass our state.
+  PassthroughUserData userData =
+    { channels, (UInt32)aSample->Size(), aSample->Data() };
+
+  // Decompressed audio buffer
+  AlignedAudioBuffer decoded(maxDecodedSamples);
+  if (!decoded) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  do {
+    AudioBufferList decBuffer;
+    decBuffer.mNumberBuffers = 1;
+    decBuffer.mBuffers[0].mNumberChannels = channels;
+    decBuffer.mBuffers[0].mDataByteSize =
+      maxDecodedSamples * sizeof(AudioDataValue);
+    decBuffer.mBuffers[0].mData = decoded.get();
+
+    // in: the max number of packets we can handle from the decoder.
+    // out: the number of packets the decoder is actually returning.
+    UInt32 numFrames = MAX_AUDIO_FRAMES;
+
+    OSStatus rv = AudioConverterFillComplexBuffer(mConverter,
+                                                  _PassthroughInputDataCallback,
+                                                  &userData,
+                                                  &numFrames /* in/out */,
+                                                  &decBuffer,
+                                                  packets.get());
+
+    if (rv && rv != kNoMoreDataErr) {
+      LOG("Error decoding audio sample: %d\n", rv);
+      return MediaResult(NS_ERROR_DOM_MEDIA_DECODE_ERR,
+                         RESULT_DETAIL("Error decoding audio sample: %d @ %lld",
+                                       rv, aSample->mTime));
+    }
+
+    if (numFrames) {
+      outputData.AppendElements(decoded.get(), numFrames * channels);
+    }
+
+    if (rv == kNoMoreDataErr) {
+      break;
+    }
+  } while (true);
+
+  if (outputData.IsEmpty()) {
+    return NS_OK;
+  }
+
+  size_t numFrames = outputData.Length() / channels;
+  int rate = mOutputFormat.mSampleRate;
+  media::TimeUnit duration = FramesToTimeUnit(numFrames, rate);
+  if (!duration.IsValid()) {
+    NS_WARNING("Invalid count of accumulated audio samples");
+    return MediaResult(
+      NS_ERROR_DOM_MEDIA_OVERFLOW_ERR,
+      RESULT_DETAIL(
+        "Invalid count of accumulated audio samples: num:%llu rate:%d",
+        uint64_t(numFrames), rate));
+  }
+
+#ifdef LOG_SAMPLE_DECODE
+  LOG("pushed audio at time %lfs; duration %lfs\n",
+      (double)aSample->mTime / USECS_PER_S,
+      duration.ToSeconds());
+#endif
+
+  AudioSampleBuffer data(outputData.Elements(), outputData.Length());
+  if (!data.Data()) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  if (mChannelLayout && !mAudioConverter) {
+    AudioConfig in(*mChannelLayout.get(), rate);
+    AudioConfig out(channels, rate);
+    if (!in.IsValid() || !out.IsValid()) {
+      return MediaResult(NS_ERROR_DOM_MEDIA_DECODE_ERR,
+                         RESULT_DETAIL("Invalid audio config"));
+    }
+    mAudioConverter = MakeUnique<AudioConverter>(in, out);
+  }
+  if (mAudioConverter) {
+    MOZ_ASSERT(mAudioConverter->CanWorkInPlace());
+    data = mAudioConverter->Process(Move(data));
+  }
+
+  RefPtr<AudioData> audio = new AudioData(aSample->mOffset,
+                                          aSample->mTime,
+                                          duration.ToMicroseconds(),
+                                          numFrames,
+                                          data.Forget(),
+                                          channels,
+                                          rate);
+  mCallback->Output(audio);
+  return NS_OK;
+}
+
+MediaResult
+AppleATDecoder::GetInputAudioDescription(AudioStreamBasicDescription& aDesc,
+                                         const nsTArray<uint8_t>& aExtraData)
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+
+  // Request the properties from CoreAudio using the codec magic cookie
+  AudioFormatInfo formatInfo;
+  PodZero(&formatInfo.mASBD);
+  formatInfo.mASBD.mFormatID = mFormatID;
+  if (mFormatID == kAudioFormatMPEG4AAC) {
+    formatInfo.mASBD.mFormatFlags = mConfig.mExtendedProfile;
+  }
+  formatInfo.mMagicCookieSize = aExtraData.Length();
+  formatInfo.mMagicCookie = aExtraData.Elements();
+
+  UInt32 formatListSize;
+  // Attempt to retrieve the default format using
+  // kAudioFormatProperty_FormatInfo method.
+  // This method only retrieves the FramesPerPacket information required
+  // by the decoder, which depends on the codec type and profile.
+  aDesc.mFormatID = mFormatID;
+  aDesc.mChannelsPerFrame = mConfig.mChannels;
+  aDesc.mSampleRate = mConfig.mRate;
+  UInt32 inputFormatSize = sizeof(aDesc);
+  OSStatus rv = AudioFormatGetProperty(kAudioFormatProperty_FormatInfo,
+                                       0,
+                                       NULL,
+                                       &inputFormatSize,
+                                       &aDesc);
+  if (NS_WARN_IF(rv)) {
+    return MediaResult(
+      NS_ERROR_FAILURE,
+      RESULT_DETAIL("Unable to get format info:%lld", int64_t(rv)));
+  }
+
+  // If any of the methods below fail, we will return the default format as
+  // created using kAudioFormatProperty_FormatInfo above.
+  rv = AudioFormatGetPropertyInfo(kAudioFormatProperty_FormatList,
+                                  sizeof(formatInfo),
+                                  &formatInfo,
+                                  &formatListSize);
+  if (rv || (formatListSize % sizeof(AudioFormatListItem))) {
+    return NS_OK;
+  }
+  size_t listCount = formatListSize / sizeof(AudioFormatListItem);
+  auto formatList = MakeUnique<AudioFormatListItem[]>(listCount);
+
+  rv = AudioFormatGetProperty(kAudioFormatProperty_FormatList,
+                              sizeof(formatInfo),
+                              &formatInfo,
+                              &formatListSize,
+                              formatList.get());
+  if (rv) {
+    return NS_OK;
+  }
+  LOG("found %u available audio stream(s)",
+      formatListSize / sizeof(AudioFormatListItem));
+  // Get the index number of the first playable format.
+  // This index number will be for the highest quality layer the platform
+  // is capable of playing.
+  UInt32 itemIndex;
+  UInt32 indexSize = sizeof(itemIndex);
+  rv = AudioFormatGetProperty(kAudioFormatProperty_FirstPlayableFormatFromList,
+                              formatListSize,
+                              formatList.get(),
+                              &indexSize,
+                              &itemIndex);
+  if (rv) {
+    return NS_OK;
+  }
+
+  aDesc = formatList[itemIndex].mASBD;
+
+  return NS_OK;
+}
+
+AudioConfig::Channel
+ConvertChannelLabel(AudioChannelLabel id)
+{
+  switch (id) {
+    case kAudioChannelLabel_Mono:
+      return AudioConfig::CHANNEL_MONO;
+    case kAudioChannelLabel_Left:
+      return AudioConfig::CHANNEL_LEFT;
+    case kAudioChannelLabel_Right:
+      return AudioConfig::CHANNEL_RIGHT;
+    case kAudioChannelLabel_Center:
+      return AudioConfig::CHANNEL_CENTER;
+    case kAudioChannelLabel_LFEScreen:
+      return AudioConfig::CHANNEL_LFE;
+    case kAudioChannelLabel_LeftSurround:
+      return AudioConfig::CHANNEL_LS;
+    case kAudioChannelLabel_RightSurround:
+      return AudioConfig::CHANNEL_RS;
+    case kAudioChannelLabel_CenterSurround:
+      return AudioConfig::CHANNEL_RCENTER;
+    case kAudioChannelLabel_RearSurroundLeft:
+      return AudioConfig::CHANNEL_RLS;
+    case kAudioChannelLabel_RearSurroundRight:
+      return AudioConfig::CHANNEL_RRS;
+    default:
+      return AudioConfig::CHANNEL_INVALID;
+  }
+}
+
+// Will set mChannelLayout if a channel layout could properly be identified
+// and is supported.
+nsresult
+AppleATDecoder::SetupChannelLayout()
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+
+  // Determine the channel layout.
+  UInt32 propertySize;
+  UInt32 size;
+  OSStatus status =
+    AudioConverterGetPropertyInfo(mConverter,
+                                  kAudioConverterOutputChannelLayout,
+                                  &propertySize, NULL);
+  if (status || !propertySize) {
+    LOG("Couldn't get channel layout property (%s)", FourCC2Str(status));
+    return NS_ERROR_FAILURE;
+  }
+
+  auto data = MakeUnique<uint8_t[]>(propertySize);
+  size = propertySize;
+  status =
+    AudioConverterGetProperty(mConverter, kAudioConverterInputChannelLayout,
+                              &size, data.get());
+  if (status || size != propertySize) {
+    LOG("Couldn't get channel layout property (%s)",
+        FourCC2Str(status));
+    return NS_ERROR_FAILURE;
+  }
+
+  AudioChannelLayout* layout =
+    reinterpret_cast<AudioChannelLayout*>(data.get());
+  AudioChannelLayoutTag tag = layout->mChannelLayoutTag;
+
+  // if tag is kAudioChannelLayoutTag_UseChannelDescriptions then the structure
+  // directly contains the the channel layout mapping.
+  // If tag is kAudioChannelLayoutTag_UseChannelBitmap then the layout will
+  // be defined via the bitmap and can be retrieved using
+  // kAudioFormatProperty_ChannelLayoutForBitmap property.
+  // Otherwise the tag itself describes the layout.
+  if (tag != kAudioChannelLayoutTag_UseChannelDescriptions) {
+    AudioFormatPropertyID property =
+      tag == kAudioChannelLayoutTag_UseChannelBitmap
+        ? kAudioFormatProperty_ChannelLayoutForBitmap
+        : kAudioFormatProperty_ChannelLayoutForTag;
+
+    if (property == kAudioFormatProperty_ChannelLayoutForBitmap) {
+      status =
+        AudioFormatGetPropertyInfo(property,
+                                   sizeof(UInt32), &layout->mChannelBitmap,
+                                   &propertySize);
+    } else {
+      status =
+        AudioFormatGetPropertyInfo(property,
+                                   sizeof(AudioChannelLayoutTag), &tag,
+                                   &propertySize);
+    }
+    if (status || !propertySize) {
+      LOG("Couldn't get channel layout property info (%s:%s)",
+          FourCC2Str(property), FourCC2Str(status));
+      return NS_ERROR_FAILURE;
+    }
+    data = MakeUnique<uint8_t[]>(propertySize);
+    layout = reinterpret_cast<AudioChannelLayout*>(data.get());
+    size = propertySize;
+
+    if (property == kAudioFormatProperty_ChannelLayoutForBitmap) {
+      status = AudioFormatGetProperty(property,
+                                      sizeof(UInt32), &layout->mChannelBitmap,
+                                      &size, layout);
+    } else {
+      status = AudioFormatGetProperty(property,
+                                      sizeof(AudioChannelLayoutTag), &tag,
+                                      &size, layout);
+    }
+    if (status || size != propertySize) {
+      LOG("Couldn't get channel layout property (%s:%s)",
+          FourCC2Str(property), FourCC2Str(status));
+      return NS_ERROR_FAILURE;
+    }
+    // We have retrieved the channel layout from the tag or bitmap.
+    // We can now directly use the channel descriptions.
+    layout->mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelDescriptions;
+  }
+
+  if (layout->mNumberChannelDescriptions > MAX_AUDIO_CHANNELS ||
+      layout->mNumberChannelDescriptions != mOutputFormat.mChannelsPerFrame) {
+    LOG("Nonsensical channel layout or not matching the original channel number");
+    return NS_ERROR_FAILURE;
+  }
+
+  AudioConfig::Channel channels[MAX_AUDIO_CHANNELS];
+  for (uint32_t i = 0; i < layout->mNumberChannelDescriptions; i++) {
+    AudioChannelLabel id = layout->mChannelDescriptions[i].mChannelLabel;
+    AudioConfig::Channel channel = ConvertChannelLabel(id);
+    channels[i] = channel;
+  }
+  mChannelLayout =
+    MakeUnique<AudioConfig::ChannelLayout>(mOutputFormat.mChannelsPerFrame,
+                                           channels);
+  return NS_OK;
+}
+
+MediaResult
+AppleATDecoder::SetupDecoder(MediaRawData* aSample)
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+  static const uint32_t MAX_FRAMES = 2;
+
+  if (mFormatID == kAudioFormatMPEG4AAC &&
+      mConfig.mExtendedProfile == 2 &&
+      mParsedFramesForAACMagicCookie < MAX_FRAMES) {
+    // Check for implicit SBR signalling if stream is AAC-LC
+    // This will provide us with an updated magic cookie for use with
+    // GetInputAudioDescription.
+    if (NS_SUCCEEDED(GetImplicitAACMagicCookie(aSample)) &&
+        !mMagicCookie.Length()) {
+      // nothing found yet, will try again later
+      mParsedFramesForAACMagicCookie++;
+      return NS_ERROR_NOT_INITIALIZED;
+    }
+    // An error occurred, fallback to using default stream description
+  }
+
+  LOG("Initializing Apple AudioToolbox decoder");
+
+  AudioStreamBasicDescription inputFormat;
+  PodZero(&inputFormat);
+  MediaResult rv =
+    GetInputAudioDescription(inputFormat,
+                             mMagicCookie.Length() ?
+                                 mMagicCookie : *mConfig.mExtraData);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  // Fill in the output format manually.
+  PodZero(&mOutputFormat);
+  mOutputFormat.mFormatID = kAudioFormatLinearPCM;
+  mOutputFormat.mSampleRate = inputFormat.mSampleRate;
+  mOutputFormat.mChannelsPerFrame = inputFormat.mChannelsPerFrame;
+#if defined(MOZ_SAMPLE_TYPE_FLOAT32)
+  mOutputFormat.mBitsPerChannel = 32;
+  mOutputFormat.mFormatFlags =
+    kLinearPCMFormatFlagIsFloat |
+    0;
+#elif defined(MOZ_SAMPLE_TYPE_S16)
+  mOutputFormat.mBitsPerChannel = 16;
+  mOutputFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | 0;
+#else
+# error Unknown audio sample type
+#endif
+  // Set up the decoder so it gives us one sample per frame
+  mOutputFormat.mFramesPerPacket = 1;
+  mOutputFormat.mBytesPerPacket = mOutputFormat.mBytesPerFrame
+        = mOutputFormat.mChannelsPerFrame * mOutputFormat.mBitsPerChannel / 8;
+
+  OSStatus status = AudioConverterNew(&inputFormat, &mOutputFormat, &mConverter);
+  if (status) {
+    LOG("Error %d constructing AudioConverter", status);
+    mConverter = nullptr;
+    return MediaResult(
+      NS_ERROR_FAILURE,
+      RESULT_DETAIL("Error constructing AudioConverter:%lld", int64_t(status)));
+  }
+
+  if (NS_FAILED(SetupChannelLayout())) {
+    NS_WARNING("Couldn't retrieve channel layout, will use default layout");
+  }
+
+  return NS_OK;
+}
+
+static void
+_MetadataCallback(void* aAppleATDecoder,
+                  AudioFileStreamID aStream,
+                  AudioFileStreamPropertyID aProperty,
+                  UInt32* aFlags)
+{
+  AppleATDecoder* decoder = static_cast<AppleATDecoder*>(aAppleATDecoder);
+  LOG("MetadataCallback receiving: '%s'", FourCC2Str(aProperty));
+  if (aProperty == kAudioFileStreamProperty_MagicCookieData) {
+    UInt32 size;
+    Boolean writeable;
+    OSStatus rv = AudioFileStreamGetPropertyInfo(aStream,
+                                                 aProperty,
+                                                 &size,
+                                                 &writeable);
+    if (rv) {
+      LOG("Couldn't get property info for '%s' (%s)",
+          FourCC2Str(aProperty), FourCC2Str(rv));
+      decoder->mFileStreamError = true;
+      return;
+    }
+    auto data = MakeUnique<uint8_t[]>(size);
+    rv = AudioFileStreamGetProperty(aStream, aProperty,
+                                    &size, data.get());
+    if (rv) {
+      LOG("Couldn't get property '%s' (%s)",
+          FourCC2Str(aProperty), FourCC2Str(rv));
+      decoder->mFileStreamError = true;
+      return;
+    }
+    decoder->mMagicCookie.AppendElements(data.get(), size);
+  }
+}
+
+static void
+_SampleCallback(void* aSBR,
+                UInt32 aNumBytes,
+                UInt32 aNumPackets,
+                const void* aData,
+                AudioStreamPacketDescription* aPackets)
+{
+}
+
+nsresult
+AppleATDecoder::GetImplicitAACMagicCookie(const MediaRawData* aSample)
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+
+  // Prepend ADTS header to AAC audio.
+  RefPtr<MediaRawData> adtssample(aSample->Clone());
+  if (!adtssample) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  int8_t frequency_index =
+    mp4_demuxer::Adts::GetFrequencyIndex(mConfig.mRate);
+
+  bool rv = mp4_demuxer::Adts::ConvertSample(mConfig.mChannels,
+                                             frequency_index,
+                                             mConfig.mProfile,
+                                             adtssample);
+  if (!rv) {
+    NS_WARNING("Failed to apply ADTS header");
+    return NS_ERROR_FAILURE;
+  }
+  if (!mStream) {
+    OSStatus rv = AudioFileStreamOpen(this,
+                                      _MetadataCallback,
+                                      _SampleCallback,
+                                      kAudioFileAAC_ADTSType,
+                                      &mStream);
+    if (rv) {
+      NS_WARNING("Couldn't open AudioFileStream");
+      return NS_ERROR_FAILURE;
+    }
+  }
+
+  OSStatus status = AudioFileStreamParseBytes(mStream,
+                                              adtssample->Size(),
+                                              adtssample->Data(),
+                                              0 /* discontinuity */);
+  if (status) {
+    NS_WARNING("Couldn't parse sample");
+  }
+
+  if (status || mFileStreamError || mMagicCookie.Length()) {
+    // We have decoded a magic cookie or an error occurred as such
+    // we won't need the stream any longer.
+    AudioFileStreamClose(mStream);
+    mStream = nullptr;
+  }
+
+  return (mFileStreamError || status) ? NS_ERROR_FAILURE : NS_OK;
+}
+
+} // namespace mozilla