Retired Document
Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.
Relevant replacement documents include:
Sources/Classes/SeqGrab/SGAudio.mm
/* Copyright: © Copyright 2005 Apple Computer, Inc. All rights reserved. |
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. |
("Apple") in consideration of your agreement to the following terms, and your |
use, installation, modification or redistribution of this Apple software |
constitutes acceptance of these terms. If you do not agree with these terms, |
please do not use, install, modify or redistribute this Apple software. |
In consideration of your agreement to abide by the following terms, and subject |
to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs |
copyrights in this original Apple software (the "Apple Software"), to use, |
reproduce, modify and redistribute the Apple Software, with or without |
modifications, in source and/or binary forms; provided that if you redistribute |
the Apple Software in its entirety and without modifications, you must retain |
this notice and the following text and disclaimers in all such redistributions of |
the Apple Software. Neither the name, trademarks, service marks or logos of |
Apple Computer, Inc. may be used to endorse or promote products derived from the |
Apple Software without specific prior written permission from Apple. Except as |
expressly stated in this notice, no other rights or licenses, express or implied, |
are granted by Apple herein, including but not limited to any patent rights that |
may be infringed by your derivative works or by other works in which the Apple |
Software may be incorporated. |
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO |
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED |
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN |
COMBINATION WITH YOUR PRODUCTS. |
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR |
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION |
OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT |
(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN |
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
#import "SGAudio.h" |
#import "WhackedDebugMacros.h" |
#import <CoreAudioKit/CoreAudioKit.h> |
#import "SGAudioSettings.h" |
NSString * SGAudioDeviceListChangedNotification = @"SGAudioDeviceListChangedNotification"; |
NSString * SGAudioRecordDeviceDiedNotification = @"SGAudioRecordDeviceDiedNotification"; |
NSString * SGAudioRecordDeviceHoggedChangedNotification = @"SGAudioRecordDeviceHoggedChangedNotification"; |
NSString * SGAudioRecordDeviceInUseChangedNotification = @"SGAudioRecordDeviceInUseChangedNotification"; |
NSString * SGAudioRecordDeviceStreamFormatChangedNotification = @"SGAudioRecordDeviceStreamFormatChangedNotification"; |
NSString * SGAudioRecordDeviceStreamFormatListChangedNotification = @"SGAudioRecordDeviceStreamFormatListChangedNotification"; |
NSString * SGAudioRecordDeviceInputSelectionNotification = @"SGAudioRecordDeviceInputSelectionNotification"; |
NSString * SGAudioRecordDeviceInputListChangedNotification = @"SGAudioRecordDeviceInputListChangedNotification"; |
NSString * SGAudioPreviewDeviceDiedNotification = @"SGAudioPreviewDeviceDiedNotification"; |
NSString * SGAudioPreviewDeviceHoggedChangedNotification = @"SGAudioPreviewDeviceHoggedChangedNotification"; |
NSString * SGAudioPreviewDeviceInUseChangedNotification = @"SGAudioPreviewDeviceInUseChangedNotification"; |
NSString * SGAudioPreviewDeviceStreamFormatChangedNotification = @"SGAudioPreviewDeviceStreamFormatChangedNotification"; |
NSString * SGAudioPreviewDeviceStreamFormatListChangedNotification = @"SGAudioPreviewDeviceStreamFormatListChangedNotification"; |
NSString * SGAudioPreviewDeviceOutputSelectionChangedNotification = @"SGAudioPreviewDeviceOutputSelectionChangedNotification"; |
NSString * SGAudioPreviewDeviceOutputListChangedNotification = @"SGAudioPreviewDeviceOutputListChangedNotification"; |
NSString * SGAudioOutputStreamFormatChangedNotification = @"SGAudioOutputStreamFormatChangedNotification"; |
static OSStatus myPreMixSGAudioCallback( |
SGChannel c, |
void * inRefCon, |
SGAudioCallbackFlags * ioFlags, |
const AudioTimeStamp * inTimeStamp, |
const UInt32 * inNumberPackets, |
const AudioBufferList * inData, |
const AudioStreamPacketDescription* inPacketDescriptions); |
static OSStatus |
fxUnitInputProc(void *inRefCon, |
AudioUnitRenderActionFlags *ioActionFlags, |
const AudioTimeStamp *inTimeStamp, |
UInt32 inBusNumber, |
UInt32 inNumberFrames, |
AudioBufferList *ioData); |
static void |
sgAudioPropListenerCallback(ComponentInstance inComponent, |
ComponentPropertyClass inPropClass, |
ComponentPropertyID inPropID, |
void *inUserData); |
@implementation SGAudio |
/*___________________________________________________________________________________________ |
*/ |
- (id)initWithSeqGrab:(SeqGrab*)sg |
{ |
OSStatus err = noErr; |
NSData * data = nil; |
ComponentPropertyInfo * cpi = NULL; |
Boolean audiComponentAlreadyOpened = (mChan != NULL); |
self = [super initWithSeqGrab:sg]; |
if (false == audiComponentAlreadyOpened) |
BAILSETERR( SGNewChannel([sg seqGrabComponent], SGAudioMediaType, &mChan) ); |
BAILSETERR( SGSetChannelRefCon(mChan, (long)self) ); |
[mSG addChannel:self]; |
[self setUsage:seqGrabPreview + seqGrabRecord]; |
// register self as a listener of all the SGAudio Listenable properties. |
// we will create notifications for all the listenable properties we recognize |
[self getPropertyWithClass:kComponentPropertyClassPropertyInfo |
id:kComponentPropertyInfoList |
size:sizeof(data) |
address:&data |
sizeUsed:NULL]; |
cpi = (ComponentPropertyInfo*)[data bytes]; |
if (cpi) |
{ |
for (int i = 0; i < [data length]/sizeof(ComponentPropertyInfo); i++) |
{ |
if (cpi[i].propFlags & kComponentPropertyFlagWillNotifyListeners) |
{ |
QTAddComponentPropertyListener(mChan, |
cpi[i].propClass, cpi[i].propID, |
(QTComponentPropertyListenerUPP)sgAudioPropListenerCallback, |
self); |
} |
} |
} |
// set the channel map on the record device to expressly indicate our desire to |
// receive all channels from the record device (a reasonable default) |
if (false == audiComponentAlreadyOpened) |
{ |
AudioStreamBasicDescription devFormat; |
if (noErr == [self getPropertyWithClass: kQTPropertyClass_SGAudioRecordDevice |
id: kQTSGAudioPropertyID_StreamFormat |
size:sizeof(devFormat) |
address:&devFormat |
sizeUsed:NULL]) |
{ |
SInt32 * map = (SInt32*)malloc(devFormat.mChannelsPerFrame * sizeof(SInt32)); |
for (int i = 0; i < devFormat.mChannelsPerFrame; i++) |
{ |
map[i] = i; |
} |
[self setPropertyWithClass: kQTPropertyClass_SGAudioRecordDevice |
id: kQTSGAudioPropertyID_ChannelMap |
size: devFormat.mChannelsPerFrame * sizeof(SInt32) |
address: map]; |
free(map); |
} |
} |
mDoInitFXUnits = YES; |
bail: |
[data release]; |
if (err) |
{ |
[self release]; |
return nil; |
} |
return self; |
} |
/*___________________________________________________________________________________________ |
*/ |
- (void)dealloc |
{ |
//NSLog(@"[SGAudio dealloc] %p", self); |
while (mFXUnitsCount--) |
CloseComponent(mFXUnits[mFXUnitsCount]); |
[super dealloc]; |
} |
/*___________________________________________________________________________________________ |
*/ |
- (OSType)channelType |
{ |
return SGAudioMediaType; |
}; |
/*___________________________________________________________________________________________ |
*/ |
- (OSStatus)getPropertyInfoWithClass:(ComponentPropertyClass)theClass |
id:(ComponentPropertyID)theID |
type:(ComponentValueType*)type |
size:(ByteCount*)sz |
flags:(UInt32*)flags |
{ |
return QTGetComponentPropertyInfo(mChan, theClass, theID, type, sz, flags); |
} |
/*___________________________________________________________________________________________ |
*/ |
- (OSStatus)getPropertyWithClass:(ComponentPropertyClass)theClass |
id:(ComponentPropertyID)theID |
size:(ByteCount)sz |
address:(ComponentValuePtr)addr |
sizeUsed:(ByteCount*)szUsed |
{ |
return QTGetComponentProperty(mChan, theClass, theID, sz, addr, szUsed); |
} |
/*___________________________________________________________________________________________ |
*/ |
- (OSStatus)setPropertyWithClass:(ComponentPropertyClass)theClass |
id:(ComponentPropertyID)theID |
size:(ByteCount)sz |
address:(ConstComponentValuePtr)addr |
{ |
return QTSetComponentProperty(mChan, theClass, theID, sz, addr); |
} |
/*___________________________________________________________________________________________ |
*/ |
// The following three functions are for convenience in getting common properties |
- (NSArray*)deviceList |
{ |
NSArray * devList = nil; |
[self getPropertyWithClass: kQTPropertyClass_SGAudio |
id: kQTSGAudioPropertyID_DeviceListWithAttributes |
size: sizeof(NSArray*) |
address: &devList |
sizeUsed: NULL]; |
return [devList autorelease]; |
} |
/*___________________________________________________________________________________________ |
*/ |
- (NSArray*)recordCapableDeviceList |
{ |
NSArray * devList = [self deviceList]; |
NSMutableArray * myList = nil; |
if (devList) |
{ |
myList = [NSMutableArray array]; |
for (int i = 0; i < [devList count]; i++) |
{ |
NSDictionary * devDict = [devList objectAtIndex:i]; |
UInt32 key = kQTAudioDeviceAttribute_DeviceCanRecordKey; |
if (YES == [(NSNumber*)[devDict objectForKey:(id)key] boolValue]) |
[myList addObject:devDict]; |
} |
} |
return myList; |
} |
/*___________________________________________________________________________________________ |
*/ |
- (NSArray*)previewCapableDeviceList |
{ |
NSArray * devList = [self deviceList]; |
NSMutableArray * myList = nil; |
if (devList) |
{ |
myList = [NSMutableArray array]; |
for (int i = 0; i < [devList count]; i++) |
{ |
NSDictionary * devDict = [devList objectAtIndex:i]; |
UInt32 key = kQTAudioDeviceAttribute_DeviceCanPreviewKey; |
if (YES == [(NSNumber*)[devDict objectForKey:(id)key] boolValue]) |
[myList addObject:devDict]; |
} |
} |
return myList; |
} |
/*________________________________________________________________________________________ |
*/ |
- (NSString*)summaryString |
{ |
NSString * device = nil; |
NSDictionary * attribs = nil; |
NSString * retval = nil; |
[self getPropertyWithClass: kQTPropertyClass_SGAudioRecordDevice |
id: kQTSGAudioPropertyID_DeviceAttributes |
size: sizeof(attribs) |
address: &attribs |
sizeUsed: NULL]; |
device = [attribs objectForKey:(id)kQTAudioDeviceAttribute_DeviceNameKey]; |
retval = [NSString stringWithFormat:@"[%p] SGAudio: %@", self, device]; |
[attribs release]; |
return retval; |
} |
/*________________________________________________________________________________________ |
*/ |
- (BOOL)isVideoChannel |
{ |
return NO; |
} |
/*________________________________________________________________________________________ |
*/ |
- (BOOL)isAudioChannel |
{ |
return YES; |
} |
/*________________________________________________________________________________________ |
*/ |
// we override the SGChan base class's showSettingsDialog implementation, as the |
// SGAudioMediaType channel that shipped in QT 7 does not implement SGSettingsDialog(), |
// but our Cocoa wrapper does. |
- (OSStatus)showSettingsDialog |
{ |
SGAudioSettings * settings = [[SGAudioSettings alloc] initWithSGChan:self]; |
[settings showPanel:self]; |
[settings release]; |
return noErr; |
} |
/*________________________________________________________________________________________ |
*/ |
- (void)notifyOfChangeInPropClass:(ComponentPropertyClass)theClass |
id:(ComponentPropertyID)theID |
{ |
NSString * notif = nil; |
switch (theClass) { |
case kQTPropertyClass_SGAudio: |
switch (theID) { |
case kQTSGAudioPropertyID_DeviceListWithAttributes: |
notif = SGAudioDeviceListChangedNotification; |
break; |
case kQTSGAudioPropertyID_StreamFormat: |
notif = SGAudioOutputStreamFormatChangedNotification; |
break; |
default: |
NSLog(@"Unknown SGAudio property (%.4s)", (char*)&theID); |
break; |
}; |
break; |
case kQTPropertyClass_SGAudioRecordDevice: |
switch (theID) { |
case kQTSGAudioPropertyID_DeviceAlive: |
notif = SGAudioRecordDeviceDiedNotification; |
mDoInitFXUnits = YES; |
break; |
case kQTSGAudioPropertyID_DeviceHogged: |
notif = SGAudioRecordDeviceHoggedChangedNotification; |
break; |
case kQTSGAudioPropertyID_DeviceInUse: |
notif = SGAudioRecordDeviceInUseChangedNotification; |
break; |
case kQTSGAudioPropertyID_StreamFormat: |
notif = SGAudioRecordDeviceStreamFormatChangedNotification; |
mDoInitFXUnits = YES; |
break; |
case kQTSGAudioPropertyID_StreamFormatList: |
notif = SGAudioRecordDeviceStreamFormatListChangedNotification; |
break; |
case kQTSGAudioPropertyID_InputSelection: |
notif = SGAudioRecordDeviceInputSelectionNotification; |
break; |
case kQTSGAudioPropertyID_InputListWithAttributes: |
notif = SGAudioRecordDeviceInputListChangedNotification; |
break; |
default: |
NSLog(@"Unknown SGAudioRecordDevice property (%.4s)", (char*)&theID); |
break; |
}; |
break; |
case kQTPropertyClass_SGAudioPreviewDevice: |
switch (theID) { |
case kQTSGAudioPropertyID_DeviceAlive: |
notif = SGAudioPreviewDeviceDiedNotification; |
break; |
case kQTSGAudioPropertyID_DeviceHogged: |
notif = SGAudioPreviewDeviceHoggedChangedNotification; |
break; |
case kQTSGAudioPropertyID_DeviceInUse: |
notif = SGAudioPreviewDeviceInUseChangedNotification; |
break; |
case kQTSGAudioPropertyID_StreamFormat: |
notif = SGAudioPreviewDeviceStreamFormatChangedNotification; |
break; |
case kQTSGAudioPropertyID_StreamFormatList: |
notif = SGAudioPreviewDeviceStreamFormatListChangedNotification; |
break; |
case kQTSGAudioPropertyID_OutputSelection: |
notif = SGAudioPreviewDeviceOutputSelectionChangedNotification; |
break; |
case kQTSGAudioPropertyID_OutputListWithAttributes: |
notif = SGAudioPreviewDeviceOutputListChangedNotification; |
break; |
default: |
NSLog(@"Unknown SGAudioPreviewDevice property (%.4s)", (char*)&theID); |
break; |
}; |
break; |
default: |
NSLog(@"[SGAudio] Unknown property class (%.4s), id (%.4s)", (char*)&theClass, (char*)&theID); |
break; |
}; |
if (notif) |
[[NSNotificationCenter defaultCenter] postNotificationName:notif object:self]; |
} |
/*________________________________________________________________________________________ |
*/ |
- (AudioUnit *)fxUnits |
{ |
return mFXUnits; |
} |
/*________________________________________________________________________________________ |
*/ |
- (UInt32)fxUnitsCount |
{ |
return mFXUnitsCount; |
} |
/*________________________________________________________________________________________ |
*/ |
// The SGAudioMediaType channel that shipped in QT 7 has no built in support for |
// AudioUnit fx, but our Cocoa wrapper does, using the SGAudioMediaType SGChannel's |
// SGAudioCallback mechanism. |
- (AudioUnit)insertAUFXUnit:(ComponentDescription *)fxUnitDesc; |
{ |
Component c; |
AudioUnit au; |
SGAudioCallbackStruct cbStruct; |
if (mFXUnitsCount == kMaxFXUnits) |
return NULL; |
if (fxUnitDesc->componentType != 'aufx') |
return NULL; |
c = FindNextComponent(NULL, fxUnitDesc); |
if (!c) |
return NULL; |
au = OpenComponent(c); |
if (!au) |
return NULL; |
// register our callback proc |
cbStruct.inputProc = myPreMixSGAudioCallback; |
cbStruct.inputProcRefCon = self; |
[self setPropertyWithClass:kQTPropertyClass_SGAudio |
id:kQTSGAudioPropertyID_PreMixCallback |
size:sizeof(cbStruct) |
address:&cbStruct]; |
mFXUnits[mFXUnitsCount++] = au; |
mDoInitFXUnits = YES; |
return au; |
} |
/*________________________________________________________________________________________ |
*/ |
- (BOOL)removeAUFXUnit:(AudioUnit)doomedFXUnit |
{ |
for (int i = 0; i < mFXUnitsCount; i++) |
{ |
if (mFXUnits[i] == doomedFXUnit) |
{ |
CloseComponent(doomedFXUnit); |
memcpy(&mFXUnits[i], &mFXUnits[i+1], (--mFXUnitsCount - i) * sizeof(AudioUnit)); |
// when we go down to zero, we should remove the callback from firing |
if (mFXUnitsCount == 0) |
{ |
SGAudioCallbackStruct cbStruct; |
cbStruct.inputProc = NULL; |
cbStruct.inputProcRefCon = 0; |
[self setPropertyWithClass:kQTPropertyClass_SGAudio |
id:kQTSGAudioPropertyID_PreMixCallback |
size:sizeof(cbStruct) |
address:&cbStruct]; |
} |
return YES; |
} |
} |
return NO; |
} |
/*________________________________________________________________________________________ |
*/ |
- (OSStatus)sgAudioCallbackRender: |
(SGAudioCallbackFlags *)ioFlags |
timestamp:(const AudioTimeStamp *)inTimeStamp |
numPackets:(const UInt32 *)inNumberPackets |
buffer:(const AudioBufferList *)inData |
packetDescs:(const AudioStreamPacketDescription*)inPacketDescriptions |
{ |
#pragma unused (ioFlags) |
#pragma unused (inPacketDescriptions) |
// sgAudioCallbackRender gets called when pre-mixed data is available. |
OSStatus err = noErr; |
UInt32 numFrames = *inNumberPackets; |
// we lazily initialize the units, so this code will execute the first time we |
// get a render callback |
if (mDoInitFXUnits) |
{ |
AudioStreamBasicDescription asbd; |
UInt32 maxFrames = numFrames + 512; // extra 512 for safety |
// get the pre-mix callback format |
[self getPropertyWithClass:kQTPropertyClass_SGAudio |
id:kQTSGAudioPropertyID_PreMixCallbackFormat |
size:sizeof(asbd) |
address:&asbd |
sizeUsed:NULL]; |
for (int i = 0; i < mFXUnitsCount; i++) |
{ |
// set up fx units |
UInt32 inPlace, size; |
Boolean writable; |
OSStatus caErr = noErr, inPlaceErr = noErr; |
if (mFXUnits[i]) |
{ |
AudioUnitUninitialize(mFXUnits[i]); |
caErr = AudioUnitSetProperty( |
mFXUnits[i], |
kAudioUnitProperty_StreamFormat, |
kAudioUnitScope_Input, |
0, &asbd, sizeof(asbd)); |
if (caErr == noErr) |
caErr = AudioUnitSetProperty(mFXUnits[i], |
kAudioUnitProperty_StreamFormat, |
kAudioUnitScope_Output, |
0, &asbd, sizeof(asbd)); |
if (caErr == noErr) |
caErr = AudioUnitSetProperty( |
mFXUnits[i], |
kAudioUnitProperty_MaximumFramesPerSlice, |
kAudioUnitScope_Global, |
0, &maxFrames, sizeof(maxFrames)); |
// prefer in place processing, if the fx unit can do it |
if (caErr == noErr) |
inPlaceErr = AudioUnitGetPropertyInfo( |
mFXUnits[i], |
kAudioUnitProperty_InPlaceProcessing, |
kAudioUnitScope_Global, |
0, &size, &writable); |
if (caErr == noErr && inPlaceErr == noErr) |
{ |
caErr = AudioUnitGetProperty( |
mFXUnits[i], |
kAudioUnitProperty_InPlaceProcessing, |
kAudioUnitScope_Global, |
0, &inPlace, &size); |
if (caErr == noErr && writable) |
{ |
inPlace = 1; |
caErr = AudioUnitSetProperty( |
mFXUnits[i], |
kAudioUnitProperty_InPlaceProcessing, |
kAudioUnitScope_Global, |
0, &inPlace, sizeof(inPlace)); |
} |
} |
AURenderCallbackStruct cb; |
cb.inputProc = fxUnitInputProc; |
cb.inputProcRefCon = self; |
if (caErr == noErr) |
caErr = AudioUnitSetProperty( |
mFXUnits[i], |
kAudioUnitProperty_SetRenderCallback, |
kAudioUnitScope_Global, 0, |
&cb, sizeof(cb) ); |
if (caErr == noErr) |
caErr = AudioUnitInitialize(mFXUnits[i]); |
if (caErr != noErr) |
{ |
[self removeAUFXUnit:mFXUnits[i]]; |
i = 0; // start over |
} |
} |
} |
mDoInitFXUnits = NO; |
} |
// Here, we stow away the buffer, and begin |
// the pull on our Audio Unit chain |
// we are treating the passed buffer list as |
// read/write, so we explicitly cast away the const |
mPullBuffer = (AudioBufferList*)inData; |
if (mFXUnitsCount) |
{ |
mPullUnitIndex = mFXUnitsCount - 1; |
BAILSETERR( AudioUnitRender( mFXUnits[mPullUnitIndex], |
NULL, |
inTimeStamp, 0, numFrames, mPullBuffer) ); |
} |
bail: |
return err; |
} |
/*________________________________________________________________________________________ |
*/ |
- (OSStatus)fxUnitRender:(AudioUnitRenderActionFlags *)ioActionFlags |
timestamp:(const AudioTimeStamp *)inTimeStamp |
bus:(UInt32)inBusNumber |
numFrames:(UInt32)inNumberFrames |
buffer:(AudioBufferList *)ioData |
{ |
#pragma unused (ioActionFlags) |
#pragma unused (inBusNumber) |
// fxUnitRender gets called to feed data to the AudioUnit |
// at location mFXUnits[mPullUnitIndex]. If mPullUnitIndex |
// is zero, it's already been pulled, and we need to |
// feed the buffer passed in the SGAudioCallbackProc |
OSStatus err = noErr; |
if (mPullUnitIndex > 0) |
{ |
BAILSETERR( AudioUnitRender( mFXUnits[--mPullUnitIndex], |
NULL, |
inTimeStamp, 0, inNumberFrames, ioData) ); |
} |
else { |
// we've pulled through every audio unit, now we need to feed |
// the SGAudioCallback stashed buffer |
if (mPullBuffer && (mPullBuffer->mNumberBuffers == ioData->mNumberBuffers)) |
{ |
for (int i = 0; i < ioData->mNumberBuffers; i++) |
{ |
ioData->mBuffers[i].mData = mPullBuffer->mBuffers[i].mData; |
ioData->mBuffers[i].mDataByteSize = mPullBuffer->mBuffers[i].mDataByteSize; |
} |
} |
} |
bail: |
return err; |
} |
/*________________________________________________________________________________________ |
*/ |
@end |
/*________________________________________________________________________________________ |
*/ |
static OSStatus |
fxUnitInputProc(void *inRefCon, |
AudioUnitRenderActionFlags *ioActionFlags, |
const AudioTimeStamp *inTimeStamp, |
UInt32 inBusNumber, |
UInt32 inNumberFrames, |
AudioBufferList *ioData) |
{ |
SGAudio * myself = (SGAudio*)inRefCon; |
return ([myself fxUnitRender:ioActionFlags |
timestamp:inTimeStamp |
bus:inBusNumber |
numFrames:inNumberFrames |
buffer:ioData]); |
} |
/*________________________________________________________________________________________ |
*/ |
static OSStatus myPreMixSGAudioCallback( |
SGChannel c, |
void * inRefCon, |
SGAudioCallbackFlags * ioFlags, |
const AudioTimeStamp * inTimeStamp, |
const UInt32 * inNumberPackets, |
const AudioBufferList * inData, |
const AudioStreamPacketDescription* inPacketDescriptions) |
{ |
#pragma unused (c) |
SGAudio * myself = (SGAudio*)inRefCon; |
return ([myself sgAudioCallbackRender:ioFlags |
timestamp:inTimeStamp |
numPackets:inNumberPackets |
buffer:inData |
packetDescs:inPacketDescriptions]); |
} |
/*________________________________________________________________________________________ |
*/ |
static void |
sgAudioPropListenerCallback(ComponentInstance inComponent, |
ComponentPropertyClass inPropClass, |
ComponentPropertyID inPropID, |
void *inUserData) |
{ |
#pragma unused (inComponent) |
// this callback will be called from a non cocoa thread. We'll need our own autorelease pool. |
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; |
SGAudio * myself = (SGAudio*)inUserData; |
[myself notifyOfChangeInPropClass:inPropClass id:inPropID]; |
[pool release]; |
} |
/*________________________________________________________________________________________ |
*/ |
Copyright © 2011 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2011-09-06