Re: SCAudioFillBuffer Multitracks

On Sep 21, 2006, at 1:42 AM, Siegfried Hand wrote:

Hi, i have a problem with SCAudioFillBuffer func when there is more than 1 audio track in a movie.
For exemple :

I have 1 audio track wiche is 5.1 h264 format, no probleme the ASBD have 6 tracks and no problems for decompressing with SCAudioFillBuffer.
But if i have two phisical tracks in the movie, like 1 track 5.1 + an other track 5.1, the ASBD give me 12 tracks (that’s ok), but SCAudioFillBuffer failed (-50) at the first call.
This is exactly the same if it’s 2 stereo or mono tracks.

Could you feed the same multitrack source movie into the scaudiocompress sample from the dts.apple.com website, and see if you still get a failure. Are you using MovieAudioExtraction to get the audio from the movie? If so, you'd only have 6 source channels, since like channel descriptions would get mixed together by MovieAudioExtraction into a summary L,R,C,LFE...etc.

-Brad Ford

QuickTime Engineering

I create the audio buffer list like this :

m_pAudioBufferList = (AudioBufferList*) calloc(1, offsetof(AudioBufferList, mBuffers[m_Asbd.mChannelsPerFrame]));
m_pAudioBufferList->mNumberBuffers = m_Asbd.mChannelsPerFrame;

for (bufNumber = 0; bufNumber < m_pAudioBufferList->mNumberBuffers; bufNumber++)
{
            m_pAudioBufferList->mBuffers[bufNumber].mNumberChannels    = 1;
            m_pAudioBufferList->mBuffers[bufNumber].mDataByteSize         = nFramesToExtract * m_Asbd.mBytesPerFrame;
            m_pAudioBufferList->mBuffers[bufNumber].mData                      = malloc(m_pAudioBufferList->mBuffers[bufNumber].mDataByteSize);
}

Hope you can help

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References:
	>SCAudioFillBuffer Multitracks (From: "Siegfried Hand" <email@hidden>)