Re: Problem loading audio data with AVIStreamRead
- From: Kirk Johansen <kirk.johansen@xxxxxxxxx>
- Date: Fri, 10 Mar 2006 08:59:20 -0500
I've reduced the problem to this small function. It calls these successfully:
AVIFileInit();
AVIFileOpen( &aviFile, fname, OF_READ | OF_SHARE_DENY_NONE, NULL );
AVIFileGetStream( aviFile, &audioStream, streamtypeAUDIO, 0 );
Then it calls
AVIStreamRead(audioStream, 0, AVISTREAMREAD_CONVENIENT, NULL, 0, &n, NULL);
and fails with the mysterious AVIERR_ERROR. I can play the video fine, and other
players will play the video and audio. I'm only having problems getting the audio
data. I hope someone knows why AVIStreamRead() is failing.
Kirk
/*******************************************************************************
tries to read the audio data from a .avi file
*******************************************************************************/
void OpenAVI2(char *fname) {
unsigned char *buf;
long n;
int status;
memset(&audioInfo, 0, sizeof(AVISTREAMINFO) );
aviFile = 0;
AVIFileInit();
status = AVIFileOpen( &aviFile, fname, OF_READ | OF_SHARE_DENY_NONE, NULL );
assert(status==0);
status = AVIFileInfo(aviFile, &fi, sizeof(AVIFILEINFO));
assert(status==0);
status = AVIFileGetStream( aviFile, &audioStream, streamtypeAUDIO, 0 );
assert(status==0);
status = AVIStreamInfo( audioStream, &audioInfo, sizeof(AVISTREAMINFO) );
assert(status==0);
audioStreamStart = AVIStreamStart(audioStream); // 0
audioStreamEnd = AVIStreamEnd(audioStream); // 226062
status = AVIStreamReadFormat(audioStream, audioStreamStart, NULL, &n); // n = 30
assert(status==0);
achunk = new BYTE[n];
status = AVIStreamReadFormat(audioStream, audioStreamStart, achunk, &n);
assert(status==0);
audioFormat = (LPWAVEFORMAT)achunk;
AVIStreamFormatSize(audioStream, 0, &n); // returns n = 30
status = AVIStreamRead(audioStream, 0, AVISTREAMREAD_CONVENIENT, NULL, 0, &n, NULL);
switch(status) {
case 0: // ok
bp = 0;
break;
case AVIERR_BUFFERTOOSMALL:
bp = 1;
break;
case AVIERR_MEMORY:
bp = 2;
break;
case AVIERR_FILEREAD:
bp = 3;
break;
case AVIERR_ERROR:
bp = 4; // <<<<<<<<<<<<<<<<<<<<<< GETS HERE
break;
default:
bp = 5;
break;
}
return;
}
.
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- From: Kirk Johansen
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