65 lines
1.9 KiB
Objective-C
65 lines
1.9 KiB
Objective-C
/*
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2006 Stephen F. Booth <me@sbooth.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "CoreAudioUtils.h"
|
|
|
|
#include <AudioToolbox/AudioFile.h>
|
|
|
|
BOOL hostIsBigEndian()
|
|
{
|
|
#ifdef __BIG_ENDIAN__
|
|
return YES;
|
|
#else
|
|
return NO;
|
|
#endif
|
|
}
|
|
|
|
AudioStreamBasicDescription propertiesToASBD(NSDictionary *properties)
|
|
{
|
|
AudioStreamBasicDescription asbd;
|
|
asbd.mFormatID = kAudioFormatLinearPCM;
|
|
asbd.mFormatFlags = 0;
|
|
|
|
asbd.mSampleRate = [[properties objectForKey:@"sampleRate"] doubleValue];
|
|
|
|
asbd.mBitsPerChannel = [[properties objectForKey:@"bitsPerSample"] intValue];
|
|
|
|
asbd.mChannelsPerFrame = [[properties objectForKey:@"channels"] intValue];;
|
|
asbd.mBytesPerFrame = (asbd.mBitsPerChannel/8)*asbd.mChannelsPerFrame;
|
|
|
|
asbd.mFramesPerPacket = 1;
|
|
asbd.mBytesPerPacket = asbd.mBytesPerFrame * asbd.mFramesPerPacket;
|
|
asbd.mReserved = 0;
|
|
|
|
if ([[properties objectForKey:@"endian"] isEqualToString:@"big"] || ([[properties objectForKey:@"endian"] isEqualToString:@"host"] && hostIsBigEndian() ))
|
|
{
|
|
asbd.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
|
|
asbd.mFormatFlags |= kLinearPCMFormatFlagIsAlignedHigh;
|
|
}
|
|
|
|
if ([[properties objectForKey:@"unsigned"] boolValue] == NO) {
|
|
asbd.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
|
|
}
|
|
|
|
return asbd;
|
|
}
|
|
|
|
|