三 ：ios学习笔记 音频 视频

1、声音播放

声音播放

NSString *path = [[NSBundle mainBundle] pathForResource:@"win"
ofType:@"wav"];
SystemSoundID soundID;
AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:path]
, &soundID);
AudioServicesPlaySystemSound (soundID);


2、音频播放＋震动

1. #import <UIKit/UIKit.h>
2. #include <AudioToolbox/AudioToolbox.h>
3.
4. @interface PlaySoundDemo1ViewController : UIViewController {
5. IBOutlet UISwitch *swcallback;
6. IBOutlet UIPickerView *soundPicker;
7. NSArray *soundData;
8. SystemSoundID soundFileObject;
9. }
10.
11. @property (nonatomic,retain) UISwitch *swcallback;
12. @property (nonatomic,retain) UIPickerView *soundPicker;
13. @property (nonatomic,retain) NSArray *soundData;
14. @property (readonly) SystemSoundID soundFileObject;
15.
16. static void completionCallback (SystemSoundID mySSID, void* myself) ;
17. - (IBAction) playSystemSound;
18. - (IBAction) playAlertSound;
19. - (IBAction) vibrate;
20. -(IBAction) stopplaysound;
21. -(void) GetPlaysound;
22.
23. @end
複製代碼
PlaySoundDemo1ViewController.m
1. //----------- 限制 ------------
2. //聲音長度要小於 30 秒
3. // In linear PCM 或者 IMA4 (IMA/ADPCM) 格式的
4. //需為 .caf, .aif, 或者 .wav 的檔案
5. //不能控制播放的進度
6. //調用方法後立即播放聲音
7. //沒有循環播放和立體聲控制
8. //參考資料：
9. //http://blog.xiang.li/2009/02/iphone-dev-audio-play/
10. //https://developer.apple.com/iphone/library/samplecode/SysSound/
11.
12. #import "PlaySoundDemo1ViewController.h"
13.
14. @implementation PlaySoundDemo1ViewController
15.
16. @synthesize swcallback,soundPicker,soundData,soundFileObject;
17.
18. //停止當前音效的播放
19. -(IBAction) stopplaysound{
20. AudioServicesRemoveSystemSoundCompletion (self.soundFileObject);
21. }
22.
23. //建立聲音物件
24. -(void) GetPlaysound{
25. [self stopplaysound];
26.
27. //取出使用者所選擇的音效項目
28. NSInteger row=[ soundPicker selectedRowInComponent:0];
29.
30. //指定不同的音效檔
31. NSString *soundfilename;
32. switch (row) {
33. case 0:
34. soundfilename=@"sound1.aiff";
35. break;
36. case 1:
37. soundfilename=@"sound2.aiff";
38. break;
39. case 2:
40. soundfilename=@"sound3.aiff";
41. break;
42. default:
43. break;
44. }
45.
46.
47. NSString *Path=[[NSBundle mainBundle] bundlePath];
48. NSURL *soundfileURL=[NSURL fileURLWithPath:[Path stringByAppendingPathComponent:soundfilename]];
49.
50. //建立音效物件
51. AudioServicesCreateSystemSoundID((CFURLRef)soundfileURL, &soundFileObject);
52.
53. //判斷是否連續播放
54. if ([swcallback isOn]){
55. // Add sound completion callback
56. AudioServicesAddSystemSoundCompletion (soundFileObject, NULL, NULL,completionCallback,(void*) self);
57. }
58. }
59.
60. //當音效播放完畢後的處理方式，這裡設定為再一次播放
61. static void completionCallback (SystemSoundID mySSID, void* myself) {
62. AudioServicesPlaySystemSound(mySSID);
63. }
64.
65. - (IBAction) playSystemSound{
66. [self GetPlaysound];
67. AudioServicesPlaySystemSound (self.soundFileObject);
68. // AudioServicesDisposeSystemSoundID (self.soundFileObject);
69. }
70.
71. -(IBAction) playAlertSound{
72. [self GetPlaysound];
73. //播放音效
74. AudioServicesPlayAlertSound (self.soundFileObject);
75. }
76. - (IBAction) vibrate{
77. //震動
78. AudioServicesPlaySystemSound (kSystemSoundID_Vibrate);
79. }
80.
81. - (void)viewDidLoad {
82. [super viewDidLoad];
83.
84. //建立音效清單陣列
85. NSArray *array=[[NSArray alloc] initWithObjects:@"音效1",@"音效2",@"音效3",nil];
86. self.soundData=array;
87. [array release];
88. }
89. - (void)dealloc {
90. [super dealloc];
91. AudioServicesDisposeSystemSoundID (self.soundFileObject);
92. }
93. #pragma mark -
94. #pragma mark soundPicker Data Soure
95. - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
96. return 1;
97. }
98. - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
99. return [soundData count];
100. }
101. #pragma mark -
102. #pragma mark soundPicker Delegate
103. - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
104. return [soundData objectAtIndex:row];
105. }
106.
107. AudioToolbox.frameworkAudioToolbox.framework


3、MP3 播放

1）、背景音乐播放 支持mp3格式 循环播放长音乐

这种播放音乐的方式导入框架#import <AVFoundation/AVFoundation.h>；

NSString *musicFilePath = [[NSBundle mainBundle] pathForResource:@"changan" ofType:@"mp3"]; //创建音乐文件路径
NSURL *musicURL = [[NSURL alloc] initFileURLWithPath:musicFilePath];

AVAudioPlayer *thePlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:musicURL error:nil];

// 创建播放器
self.myBackMusic = thePlayer; //赋值给自己定义的类变量

[musicURL release];
[thePlayer release];

[myBackMusic prepareToPlay];
[myBackMusic setVolume:1]; //设置音量大小
myBackMusic.numberOfLoops = -1;//设置音乐播放次数 -1为一直循环
if (mainMusicStatus)
{
[myBackMusic play]; //播放
}

2）、按钮播放声音
需要导入框架#import <AudioToolbox/AudioToolbox.h>

NSString *thesoundFilePath = [[NSBundle mainBundle] pathForResource:@"Clapping Crowd Studio 01" ofType:@"caf"]; //创建音乐文件路径
CFURLRef thesoundURL = (CFURLRef) [NSURL fileURLWithPath:thesoundFilePath];
AudioServicesCreateSystemSoundID(thesoundURL, &sameViewSoundID);

//变量SoundID与URL对应

AudioServicesPlaySystemSound(sameViewSoundID); // 播放SoundID声音


4、视频播放

视频播放
#import <UIKit/UIKit.h>
#import <MediaPlayer/MediaPlayer.h>
@interface MoveTestViewController : UIViewController {
NSURL *movieURL;
MPMoviePlayerController *moviePlayer;
}
@property(nonatomic,retain)NSURL *movieURL;
@property(nonatomic,retain)MPMoviePlayerController *moviePlayer;
-(void)initAndPlayMovie:(NSURL *)movieURL;
-(NSURL *)localMovieURL;
-(IBAction)ok;
@end

//
// MoveTestViewController.m
// MoveTest
//
// Created by zhen hu on 10/20/10.
// Copyright ww 2010. All rights reserved.
//

#import "MoveTestViewController.h"

@implementation MoveTestViewController
@synthesize movieURL;
@synthesize moviePlayer;
-(IBAction)ok{
//获得工程中电影文件的路径
NSURL *url=[self localMovieURL];
//播放
[self initAndPlayMovie:url];
}
-(void)initAndPlayMovie:(NSURL *)movUrl
{
// 创建播放器
MPMoviePlayerController *mp = [[MPMoviePlayerController alloc] initWithContentURL:movUrl];
if (mp)//如果不为空
{
self.moviePlayer = mp;
[mp release];
[self.moviePlayer play];//播放对象

//4.0专用
self.moviePlayer.view.frame = CGRectMake(0, 0, 320, 300);
[self.view addSubview:moviePlayer.view];
}
}

//-(void)initAndPlayNetMovie:(NSURL *)movieURL
//{
//
// MPMoviePlayerController *mp = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
// if (mp)
// {
// self.musicPlayer=mp;
// [mp release];
//
// musicPlayer.view.frame = CGRectMake(0, 340, 320, 5);
// [self.view addSubview:musicPlayer.view];
//
// }
//
//}

-(NSURL *)localMovieURL
{
if (movieURL == nil)
{
NSBundle *bundle = [NSBundle mainBundle];
if (bundle)
{//得到文件绝对路径地址
NSString *moviePath = [bundle pathForResource:@"Movie" ofType:@"m4v"];
//NSString *netPath=@"http://www.sina.com.cn/xx.m4v";
if (moviePath)
{// 把路径转换为NSURL对象
self.movieURL = [NSURL fileURLWithPath:moviePath];
}
}
}

return self.movieURL;
}

- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

- (void)dealloc {
[super dealloc];
}

@end