"iOS Dev-118" avfoundation Frame: audioservices ... Sound, Avaudioplayer Music, Avaudiorecord recording

(1) Sound playback, the core code, mainly to create a player, and then play.

#import "WPSound.h" #import <AVFoundation/AVFoundation.h> @implementation wpsoundstatic nsmutabledictionary *_ soundiddict;+ (void) initialize{_soundiddict=[nsmutabledictionary dictionary];} You cannot use lazy loading because the time class method is given to the user, so you need to set//-(Nsmutabledictionary *) soundiddict{//if (_soundiddict==nil) {//_soundi in class initialization above) Ddict=[nsmutabledictionary dictionary];//}//return _soundiddict;//}+ (void) Soundplay: (NSString *) fileName{if (!    FileName) return;    Remove Soundid systemsoundid soundid=[_soundiddict[filename] unsignedintvalue];        if (!soundid) {nsurl *url=[[nsbundle mainbundle]urlforresource:filename Withextension:nil];        if (!url) return;        Audioservicescreatesystemsoundid ((__bridge cfurlref) URL, &soundid);    Put dictionary _soundiddict[filename][email protected] (soundid); } audioservicesplaysystemsound (Soundid);}    + (void) Sounddispose: (NSString *) filename{if (fileName) return; Systemsoundid Soundid=[_soundiddict[filename] UnsignedintvalUE];    if (!soundid) return;    Audioservicesdisposesystemsoundid (Soundid); Remove [_soundiddict removeobjectforkey:filename] from the dictionary; @end

(2) Music playback, core code. It is important to note that the player created needs to be a global variable.

#import "MusicTool.h" @implementation musictoolstatic nsmutabledictionary *_audioplayerdict;static avaudioplayer *_    audioplayer;+ (void) initialize{_audioplayerdict=[nsmutabledictionary dictionary];    Set Session type Avaudiosession *session=[avaudiosession sharedinstance];    [Session Setcategory:avaudiosessioncategorysoloambient Error:nil]; [Session Setactive:yes Error:nil];}    + (Avaudioplayer *) Musicplay: (NSString *) filename{if (!filename) return nil;    Remove player Avaudioplayer *audioplayer=_audioplayerdict[filename];        if (!audioplayer) {nsurl *url=[[nsbundle mainbundle]urlforresource:filename Withextension:nil];        if (!url) return nil;        Create Audioplayer Avaudioplayer *audioplayer=[[avaudioplayer alloc]initwithcontentsofurl:url Error:NULL];        _audioplayer=audioplayer;        [_audioplayer Preparetoplay];        _audioplayer.enablerate=yes;    The following settings play speed, can be tested with//_audioplayer.rate=10;//_audioplayerdict[filename]=audioplayer;    }if (!_audioplayer.isplaying) {[_audioplayer play]; } return _audioplayer;}    + (void) Musicpause: (NSString *) filename{if (!filename) return;    Avaudioplayer *audioplayer=_audioplayerdict[filename];    if (audioplayer.isplaying) {[Audioplayer pause];    }}+ (void) Musicstop: (NSString *) filename{if (!filename) return;    Avaudioplayer *audioplayer=_audioplayerdict[filename];        if (audioplayer.isplaying) {[Audioplayer stop];    [_audioplayerdict Removeobjectforkey:filename]; }}+ (Avaudioplayer *) currentplayingaudioplayer{for (NSString *filename in _audioplayerdict) {AVAudioPlayer *aud        Ioplayer=_audioplayerdict[filename];        if (audioplayer.isplaying) {return audioplayer; }} return nil;} @end

(3) recording, core code.

#import "ViewController.h" #import <AVFoundation/AVFoundation.h> @interface Viewcontroller () @property ( Nonatomic,strong) Avaudiorecorder *recorder, @property (nonatomic,strong) Cadisplaylink *link; @property (Nonatomic, Assign) float silentduration;-(ibaction) Recordstart: (ID) sender;-(ibaction) Recordstop: (ID) sender;@ End@implementation viewcontroller-(Cadisplaylink *) link{if (_link==nil) {_link=[cadisplaylink DisplayLinkWithT    Arget:self selector: @selector (update)]; } return _link;}    -(void) update{//update the measured value of the recording device [Self.recorder Updatemeters];        Get average decibel float power=[self.recorder averagepowerforchannel:0];        if (power<-30) {self.silentduration+=self.link.duration;            if (self.silentduration>=2) {[Self.recorder stop];            [Self.link invalidate];        Self.link=nil;    }}else{self.silentduration=0;    }}-(void) viewdidload {[Super viewdidload]; Do any additional setup after loading the view, TypIcally from a nib.}    -(void) didreceivememorywarning {[Super didreceivememorywarning]; Dispose of any resources the can be recreated.} -(Ibaction) Recordstart: (ID) Sender {nsstring *path=[[nssearchpathfordirectoriesindomains (nsdocumentationdirectory    , Nsuserdomainmask, YES) lastobject] stringbyappendingpathcomponent:@ "TEST.CAF"];    Nsurl *url=[nsurl Fileurlwithpath:path];    Nsmutabledictionary *setting=[nsmutabledictionary Dictionary];    Audio format setting[avformatidkey][email protected] (kAudioFormatAppleIMA4);    Audio sample rate setting[avsampleratekey][email protected] (8000.0);    Number of audio channels setting[avnumberofchannelskey][email protected] (1);        Linear audio bit depth setting[avlinearpcmbitdepthkey][email protected] (8);        Avaudiorecorder *recorder=[[avaudiorecorder alloc]initwithurl:url settings:setting Error:nil];        Allows measurement of decibel recorder.meteringenabled=yes;    cushioning [recorder Preparetorecord];        Recording [Recorder record]; Self.recorder=recordEr    Turn on the timer self.silentduration=0; [Self.link Addtorunloop:[nsrunloop Mainrunloop] formode:nsdefaultrunloopmode];}    -(Ibaction) Recordstop: (ID) Sender {[Self.link invalidate];    Self.link=nil; [Self.recorder stop];} @end

(3) Play music in the background, set 3 locations.

--Set in APPDELEGATE.M

-(void) Applicationdidenterbackground: (uiapplication *) application {    [application Beginbackgroundtaskwithexpirationhandler:nil];}

--Set in Info.plist

--there is also an audio session type set in the program (can be omitted)

+ (void) initialize{    _audioplayerdict=[nsmutabledictionary dictionary];    Set Session type    avaudiosession *session=[avaudiosession sharedinstance];    [Session Setcategory:avaudiosessioncategorysoloambient Error:nil];    [Session Setactive:yes Error:nil];}

iOS Dev-118 avfoundation frame: audioservices ... Sound, Avaudioplayer Music, Avaudiorecord recording