I see. Well, it sounds like you're on the right path to me. Could the
compression possibly be a factor? I'm doubtful that QuickTime (and/or
REALbasic) would be playing the audio at some strange sample rate
like you mentioned earlier. And, since you are doing all the heavy
lifting with declares, it sounds like all you're really getting from
RB is a handle to a movie. This makes me think that this is a
QuickTime question. (unless you have a mistake in your header length
calculations or something) Might still be worth a try to ask on the
QuickTime lists. I've found that if you provide sample code (even
pseudo code), you're more likely to get a response on that list.
Best of luck,
Erick
On Mar 31, 2006, at 10:18 PM, Jeffrey Mattox wrote:
I'm not getting the length of the file, but rather the number of
samples in the audio. After calling the (modified) GetWaveformInfo
() function in Addey's routine (which loads the samples into a
MemoryBlock), I do this:
Dim samples as Integer
samples = (SoundMemoryBlock.Size - 84 ) / 2 // number of 16-bit
samples
I've modified GetWaveformInfo() to return 16-bit samples instead of
8-bit samples. For 8-bit samples, I believe it's this:
samples = SoundMemoryBlock.Size - 42 // number of 8-bit samples
(but it might be minus 84 to skip the header, I forget.)
I also sanity check my result by taking the duration of the track
and multiply by the sample rate, as in:
Dim theSongDuration as Integer
Dim theMovieTimeScale as Integer
theSongDuration = GetMovieDuration(me.Movie.Handle) ' scaled
theMovieTimeScale = GetMovieTimeScale(me.movie.Handle)
g_theSongDuration_sec = theSongDuration / theMovieTimeScale
Dim samples as Integer
samples = theSongDuration * SoundSampleRate
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