1
我有一個類，將讓我使用音頻設備播放音，我希望能夠做的是有類遊戲莫爾斯電碼的風格，當我發類短語或字母。在Objective-C生成莫爾斯電碼的風格色調
如何，我會去嗎？我希望有人能指出我正確的方向。我已經包括音頻發生器h和.m文件下面
//
// Singer.h
// musiculesdev
//
// Created by Dylan on 2/20/09.
// Copyright 2009 __MyCompanyName__. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <AudioUnit/AudioUnit.h>
@interface Singer : NSObject {
AudioComponentInstance audioUnit;
}
-(void)initAudio; // put this in init?
-(void)start;
-(void)stop;
-(IBAction)turnOnSound:(id)sender;
@end
//
// Singer.m
// musiculesdev
//
// Created by Dylan on 2/20/09.
// Copyright 2009 __MyCompanyName__. All rights reserved.
//
#import <AudioUnit/AudioUnit.h>
#import <math.h>
#import "Singer.h"
#define kOutputBus 0
#define kSampleRate 44100
//44100.0f
#define kWaveform (M_PI * 2.0f/kSampleRate)
@implementation Singer
OSStatus playbackCallback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData) {
//Singer *me = (Singer *)inRefCon;
static int phase = 0;
for(UInt32 i = 0; i < ioData->mNumberBuffers; i++) {
int samples = ioData->mBuffers[i].mDataByteSize/sizeof(SInt16);
SInt16 values[samples];
float waves;
for(int j = 0; j < samples; j++) {
waves = 0;
waves += sin(kWaveform * 261.63f * phase);
waves += sin(kWaveform * 120.0f * phase);
waves += sin(kWaveform * 1760.3f * phase);
waves += sin(kWaveform * 880.0f * phase);
waves *= 32500/4; // <--------- make sure to divide by how many waves you're stacking
values[j] = (SInt16)waves;
values[j] += values[j]<<16;
phase++;
}
memcpy(ioData->mBuffers[i].mData, values, samples * sizeof(SInt16));
}
return noErr;
}
-(IBAction)turnOnSound:(id)sender {
Singer *singer = [[Singer alloc] init];
[singer start];
}
-(id)init {
NSLog(@"In the singer init!!");
if(self = [super init]) {
[self initAudio];
}
return self;
}
-(void)initAudio {
OSStatus status;
AudioComponentDescription desc;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_RemoteIO;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
AudioComponent outputComponent = AudioComponentFindNext(NULL, &desc);
status = AudioComponentInstanceNew(outputComponent, &audioUnit);
UInt32 flag = 1;
status = AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Output, kOutputBus, &flag, sizeof(flag));
AudioStreamBasicDescription audioFormat;
audioFormat.mSampleRate = kSampleRate;
audioFormat.mFormatID = kAudioFormatLinearPCM;
audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
audioFormat.mFramesPerPacket = 1;
audioFormat.mChannelsPerFrame = 1;
audioFormat.mBitsPerChannel = 16;
audioFormat.mBytesPerPacket = 2;
audioFormat.mBytesPerFrame = 2;
status = AudioUnitSetProperty(audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, kOutputBus, &audioFormat, sizeof(audioFormat));
AURenderCallbackStruct callbackStruct;
callbackStruct.inputProc = playbackCallback;
callbackStruct.inputProcRefCon = self;
status = AudioUnitSetProperty(audioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Global, kOutputBus, &callbackStruct, sizeof(callbackStruct));
status = AudioUnitInitialize(audioUnit);
}
-(void)start {
OSStatus status;
status = AudioOutputUnitStart(audioUnit);
}
-(void)stop {
OSStatus status;
status = AudioOutputUnitStop(audioUnit);
}
-(void)dealloc {
AudioUnitUninitialize(audioUnit);
[super dealloc];
}
@end
爲什麼不能簡單地用兩個音頻文件，一個是短調（'.'）和一個長音（'-'）？ – 2011-09-04 09:39:54
感謝您的回覆馬特，我想要做什麼，當我得到這個工作是有能力有不同的話每分鐘的速度這將意味着製作多個音頻文件的短和長音。雖然我會牢記這一點，如果我不能動態生成的色調 – user551353