No output using CMdaAudioOutputStream with SetDataTypeL to play MP3

[inunu]

Hi.

I am trying to play mp3 audio from memory using CMdaAudioOutputStream according to the last sections (#5 and #6) in "S60 Platform: Music Application Developer's Guide".

The application is developed with SDK 2nd ED FP2 and tested on target platform - Nokia 6630 (8.0a 2nd ED FP2).

Audio & Video
Nokia 6630 Spec

When tested on the 6630, there is simply no output at all. The general program flow is:

In ConstructL():

iStream = CMdaAudioOutputStream::NewL(*this)
iStream->Open(&iSettings)

In MaoscOpenComplete(TInt aError): (aError = 0 in the log)

iStream->SetDataTypeL(KMMFFourCCCodeMP3);
iStream->SetAudioPropertiesL(TMdaAudioDataSettings::ESampleRate32000Hz, TMdaAudioDataSettings::EChannelsMono);
iStream->SetVolume(iStream->MaxVolume());

*32kHz Mono IS the property of the loaded MP3 audio.

In a user triggered event:

TRAPD(t, iStream->WriteL(iAudioDataPtr));

*MP3 data loading is verified. The trapped value t here is 0 in the log.

Shortly after, MaoscBufferCopied(TInt aError, const TDesC8& aBuffer) is called with aError = 0. There is no sound and MaoscPlayComplete(TInt aError) never gets called.

Is Nokia 6630 able to use SetDataTypeL() to play anything other than PCM16 data? If I remove SetDataTypeL() I DO hear garbage, as MP3 data are intepreted as PCM16.

I have also tried with CMdaAudioPlayerUtility::OpenDesL(). According to the guide mentioned earlier it requires a MIME type inserted before MP3 data. I tried inserting a standard ASCII string "audio/mpeg", "audio/mpeg\r\n\r\n", "audio/x-mp3" ... and never had any luck. Am I using the wrong format or should I use 16-bit Unicode for that?

Thanks for your help.

There are a few interesting points I discovered:
1. When using CMdaAudioPlayerUtility::OpenFileL(), the MP3 file plays fine for sure.
2. The 2nd ED FP2 SDK document NEVER mentions anything about CMdaAudioOutputStream::SetDataTypeL(), but checking with mdaaudiosampleplayer.h, it IS there.


Best Regards,
Kevin Peng

[vinaykk]

Hi,

im able to play mp3 file in S60 3rd edition.
my settings are
CMdaAudioOutputStream* iPlayer;
TMdaAudioDataSettings iSettings;


iSettings.iSampleRate = TMdaAudioDataSettings::ESampleRate44100Hz;
iSettings.iChannels = TMdaAudioDataSettings::EChannelsStereo;
iPlayer->SetPriority(EMdaPriorityMax, EMdaPriorityPreferenceQuality);
iPlayer->Open(&iSettings);

im loading 44khz stereo mp3 file
im using buffer size of 4096

Thanks,
Vinay.