[ios]音频(录音),视频 基础
1.音频播放
#import <AVFoundation/AVFoundation.h>
<AVAudioPlayerDelegate>
AVAudioPlayer *player;
- (IBAction)start:(id)sender {
NSError *err=nil;
player=[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"charleston1925_64kb" ofType:@"mp3"]]error:&err];
player.delegate=self;
if(err){
NSLog(@"%@",[err localizedDescription]);
[err release];
}
[player play];
}
- (IBAction)stop:(id)sender {
[player stop];
}
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{
NSLog(@"%@",@"play done!");
}
/* if an error occurs while decoding it will be reported to the delegate. */
- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error{
NSLog(@"%@",[error localizedDescription]);
}
2.音频播放
#import <AudioToolbox/AudioToolbox.h>
void SoundFinishedPlayingCallback(SystemSoundID sound_id, void* user_data){
AudioServicesDisposeSystemSoundID(sound_id);
}
NSURL *system_sound_url=[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"BeepGMC500" ofType:@"wav"]];
SystemSoundID system_sound_id;
AudioServicesCreateSystemSoundID((CFURLRef)system_sound_url, &system_sound_id);
AudioServicesAddSystemSoundCompletion(system_sound_id, NULL, NULL ,SoundFinishedPlayingCallback, NULL);
AudioServicesPlaySystemSound(system_sound_id);
让设备震动
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
3.视频播放
#import <MediaPlayer/MediaPlayer.h>
NSString *path = [[NSBundle mainBundle] pathForResource:fileName ofType:@"mp4"];
NSURL *url = [NSURL fileURLWithPath:path];
MPMoviePlayerController *movie = [[MPMoviePlayerController alloc] initWithContentURL:url];
movie.controlStyle = MPMovieControlStyleFullscreen;
[movie.view setFrame:self.view.bounds];
movie.initialPlaybackTime = -1;
[self.view addSubview:movie.view];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(myMovieFinishedCallback:)
name:MPMoviePlayerPlaybackDidFinishNotification
object:movie];
[movie play];
-(void)myMovieFinishedCallback:(NSNotification*)notify
{
MPMoviePlayerController* theMovie = [notify object];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMoviePlayerPlaybackDidFinishNotification
object:theMovie];
[theMovie.view removeFromSuperview];
[theMovie release];
}
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(myMovieFinishedCallback:)
name:MPMoviePlayerPlaybackDidFinishNotification
object:movie];
[movie play];
4.录音，播放
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface RecorderViewController : UIViewController
{
AVAudioRecorder * recoider;
AVAudioPlayer * player;
}
@property (retain, nonatomic) IBOutlet AVAudioRecorder * recoider;
@property (retain, nonatomic) IBOutlet AVAudioPlayer * player;
m文件
-(NSString *) documentsDirectory{
NSArray * paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
return [paths objectAtIndex:0];
}
//开始录音
- (IBAction)Rocord:(id)sender {
self.myLabel.text=@"Recode.....";
if([recoider isRecording])
{
return;
}
if([player isPlaying]){
return;
}
NSError *error=nil;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error:&error];
[[AVAudioSession sharedInstance] setActive:YES error:&error];
NSMutableDictionary *settings=[NSMutableDictionary dictionary];
[settings setValue:[NSNumber numberWithInt:kAudioFormatLinearPCM]
forKey:AVFormatIDKey];
[settings setValue:[NSNumber numberWithFloat:44100.0]
forKey:AVSampleRateKey]; //采样率
[settings setValue:[NSNumber numberWithInt:1]
forKey:AVNumberOfChannelsKey];//通道的数目
[settings setValue:[NSNumber numberWithInt:16]
forKey:AVLinearPCMBitDepthKey];//采样位数 默认 16
[settings setValue:[NSNumber numberWithBool:NO]
forKey:AVLinearPCMIsBigEndianKey];//大端还是小端 是内存的组织方式
[settings setValue:[NSNumber numberWithBool:NO]
forKey:AVLinearPCMIsFloatKey];//采样信号是整数还是浮点数
NSString * filePath=[NSString stringWithFormat:@"%@/rec_audio.caf",[self documentsDirectory]];
NSURL * fileurl=[NSURL fileURLWithPath:filePath];
self.recoider=[[AVAudioRecorder alloc] initWithURL:fileurl settings:settings error:&error];
[self.recoider record];
}
//停止录制
- (IBAction)stop:(id)sender {
self.myLabel.text=@"stoping...";
if([recoider isRecording])
{
[recoider stop];
}
if([player isPlaying]){
[player stop];
}
}
//播放录制的音频
- (IBAction)play:(id)sender {
self.myLabel.text=@"playing...";
if([recoider isRecording])
{
return;
}
if([player isPlaying]){
return;
}
NSError * errl=nil;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&errl];
[[AVAudioSession sharedInstance] setActive:YES error:&errl];
NSString * filePath=[NSString stringWithFormat:@"%@/rec_audio.caf",[self documentsDirectory]];
NSURL * fileurl=[NSURL fileURLWithPath:filePath];
self.player=[[AVAudioPlayer alloc] initWithContentsOfURL:fileurl error:&errl];
[self.player play];
}
整理了一些多媒体应用中会用到的基础的东西
