nsresult
AppleATDecoder::SetupDecoder(mp4_demuxer::MP4Sample* aSample)
{
if (mFormatID == kAudioFormatMPEG4AAC &&
mConfig.extended_profile == 2) {
// 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
return NS_ERROR_NOT_INITIALIZED;
}
// An error occurred, fallback to using default stream description
}
LOG("Initializing Apple AudioToolbox decoder");
AudioStreamBasicDescription inputFormat;
PodZero(&inputFormat);
nsresult rv =
GetInputAudioDescription(inputFormat,
mMagicCookie.Length() ?
mMagicCookie : *mConfig.extra_data);
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;
#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 NS_ERROR_FAILURE;
}
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;
}
