iOS 音視頻合成, AVMutableComposition來合成音視頻

2019-11-06 09:53:55

字體：大中小

來源：轉(zhuǎn)載

供稿：網(wǎng)友

音視頻主要是利用AVFoundation框架下的AVMutableComposition來合成音視頻.

在AVMutableComposition中傳入兩個數(shù)據(jù)流,一個是音頻一個是視頻,之后調(diào)用合成方法就可以了

上代碼

storyBoard中拖入一個button,一個imageView

這里寫圖片描述

為了效果好可以將IamgeView的背景色調(diào)為黑色

然后在ViewController中添加以下代碼

#import "ViewController.h"#import <AVFoundation/AVFoundation.h>#import "MBPRogressHUD+MJ.h"@interface ViewController ()/** 用于播放 */@property (weak, nonatomic) IBOutlet UIImageView *imageView;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad];}- (IBAction)mergeAction:(UIButton *)sender { [self merge];}// 混合音樂- (void)merge{ // mbp提示框 [MBProgressHUD showMessage:@"正在處理中"]; // 路徑 NSString *documents = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; // 聲音來源 NSURL *audioInputUrl = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"五環(huán)之歌" ofType:@"mp3"]]; // 視頻來源 NSURL *videoInputUrl = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"myPlayer" ofType:@"mp4"]]; // 最終合成輸出路徑 NSString *outPutFilePath = [documents stringByAppendingPathComponent:@"merge.mp4"]; // 添加合成路徑 NSURL *outputFileUrl = [NSURL fileURLWithPath:outPutFilePath]; // 時間起點 CMTime nextClistartTime = kCMTimeZero; // 創(chuàng)建可變的音視頻組合 AVMutableComposition *comosition = [AVMutableComposition composition]; // 視頻采集 AVURLAsset *videoAsset = [[AVURLAsset alloc] initWithURL:videoInputUrl options:nil]; // 視頻時間范圍 CMTimeRange videoTimeRange = CMTimeRangeMake(kCMTimeZero, videoAsset.duration); // 視頻通道枚舉 kCMPersistentTrackID_Invalid = 0 AVMutableCompositionTrack *videoTrack = [comosition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; // 視頻采集通道 AVAssetTrack *videoAssetTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] firstObject]; // 把采集軌道數(shù)據(jù)加入到可變軌道之中 [videoTrack insertTimeRange:videoTimeRange ofTrack:videoAssetTrack atTime:nextClistartTime error:nil]; // 聲音采集 AVURLAsset *audioAsset = [[AVURLAsset alloc] initWithURL:audioInputUrl options:nil]; // 因為視頻短這里就直接用視頻長度了,如果自動化需要自己寫判斷 CMTimeRange audioTimeRange = videoTimeRange; // 音頻通道 AVMutableCompositionTrack *audioTrack = [comosition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; // 音頻采集通道 AVAssetTrack *audioAssetTrack = [[audioAsset tracksWithMediaType:AVMediaTypeAudio] firstObject]; // 加入合成軌道之中 [audioTrack insertTimeRange:audioTimeRange ofTrack:audioAssetTrack atTime:nextClistartTime error:nil]; // 創(chuàng)建一個輸出 AVAssetExportsession *assetExport = [[AVAssetExportSession alloc] initWithAsset:comosition presetName:AVAssetExportPresetMediumQuality]; // 輸出類型 assetExport.outputFileType = AVFileTypeQuickTimeMovie; // 輸出地址 assetExport.outputURL = outputFileUrl; // 優(yōu)化 assetExport.shouldOptimizeForNetworkUse = YES; // 合成完畢 [assetExport exportAsynchronouslyWithCompletionHandler:^{ // 回到主線程 dispatch_async(dispatch_get_main_queue(), ^{ // 調(diào)用播放方法 [self playWithUrl:outputFileUrl]; }); }];}/** 播放方法 */- (void)playWithUrl:(NSURL *)url{ // 傳入地址 AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:url]; // 播放器 AVPlayer *player = [AVPlayer playerWithPlayerItem:playerItem]; // 播放器layer AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player]; playerLayer.frame = self.imageView.frame; // 視頻填充模式 playerLayer.videoGravity = AVLayerVideoGravityResizeaspect; // 添加到imageview的layer上 [self.imageView.layer addSublayer:playerLayer]; // 隱藏提示框開始播放 [MBProgressHUD hideHUD]; [MBProgressHUD showSuccess:@"合成完成"]; // 播放 [player play];}