I am trying to convert audio stream from AAC to ADTS (Audio Data Transport Stream). This is
a necessary step to send HTTP Live Stream to Apple media player. I use the Media Foundation function MFCreateADTSMediaSink,
which is supposedly converting AAC stream to ADTS steam. I follow the code in MF wavsink sample, which converts PCM audio to WAV audio,
except replacing CreateWavSink(pStream, &pSink) by MFCreateADTSMediaSink(pStream, pAudioType, &pSink). Here pAudioType is a newly created media type and setting
MajorType to MFMediaType_Audio, SubType to MFAudioFormat_AAC, and PayloadType to 1. I also set SamplePerSecond to 48000, NumChannels to 1, BitsPerSample to 16, and BlockAlignment
to 2 to be consistent with my input file.
When I select a xx.mp4 file or a xx.aac
as input
file, the calls in RunMediaSession,
hr = pSession->GetEvent(0, &pEvent);
hr = pEvent->GetStatus(&hrStatus);
return hrStatus with error of -
“No suitable transform was found to encode or decode the content”.
And thus the session is terminated and produce no output.
In the session, every function calls return hr = S_OK, indicating the Media Foundation does not find any invalid call or invalid function
argument.
Because of this failure, I also tried to use MFCreateAC3MediaSink and had the same failure. Actually, these two functionsdo
not need encoder or decoder.
How can I make it work?
I hope Microsoft engineers can look into this matter. As I said, this function will be very useful if it can work correctly for Internet
Video/Audio streaming to Apple iPhone and iPad (which requires Transport Streaming format).
