前言
最近有个音频与视频，音频与音频合成的需求，正好做个记录，其实主要是用到了AVFoundation中的AVMutableComposition和AVAssetExportSession这两个类。废话不多话，直接上代码
音频与视频合成
#pragma mark - 音频与视频的合并
+ (void)mixVideoAndAudioWithVieoPath:(NSURL *)videoPath
audioPath:(NSURL *)audioPath
needVideoVoice:(BOOL)needVideoVoice
videoVolume:(CGFloat)videoVolume
audioVolume:(CGFloat)audioVolume
outPutFileName:(NSString *)fileName
complitionBlock:(CompletionBlock)completionBlock
{
if (videoPath == nil) {
return;
}
if (audioPath == nil) {
return;
}
if (videoVolume > 1.0) {
videoVolume = 1.0f;
}
if (videoVolume < 0.0) {
videoVolume = 0.0f;
}
if (audioVolume > 1.0) {
audioVolume = 1.0f;
}
if (audioVolume < 0.0) {
audioVolume = 0.0f;
}
dispatch_async(dispatch_get_global_queue(0, 0), ^{
AVAsset *asset = [AVAsset assetWithURL:videoPath];
AVAsset *audioAsset = [AVAsset assetWithURL:audioPath];
CMTime duration = asset.duration;
CMTimeRange video_timeRange = CMTimeRangeMake(kCMTimeZero, duration);
AVAssetTrack *videoAssetTrack = [[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVAssetTrack *audioAssetTrack = [[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
AVMutableComposition *composition = [[AVMutableComposition alloc]init];
/** 视频素材加入视频轨道 */
AVMutableCompositionTrack *videoCompositionTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[videoCompositionTrack insertTimeRange:video_timeRange ofTrack:videoAssetTrack atTime:kCMTimeZero error:nil];
/** 音频素材加入音频轨道 */
AVMutableCompositionTrack *audioCompositionTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
[audioCompositionTrack insertTimeRange:video_timeRange ofTrack:audioAssetTrack atTime:kCMTimeZero error:nil];
/** 是否加入视频原声 */
AVMutableCompositionTrack *originalAudioCompositionTrack = nil;
if (needVideoVoice) {
AVAssetTrack *originalAudioAssetTrack = [[asset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
originalAudioCompositionTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
[originalAudioCompositionTrack insertTimeRange:video_timeRange ofTrack:originalAudioAssetTrack atTime:kCMTimeZero error:nil];
}
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:composition presetName:AVAssetExportPresetMediumQuality];
/** 设置输出路径 */
NSURL *outputPath = [self exporterPathWithFileName:fileName];
exporter.outputURL = outputPath;
exporter.outputFileType = AVFileTypeQuickTimeMovie;
exporter.shouldOptimizeForNetworkUse = YES;
/** 音量控制 */
exporter.audioMix = [self buildAudioMixWithVideoTrack:originalAudioCompositionTrack
VideoVolume:videoVolume
audioTrack:audioCompositionTrack
audioVolume:audioVolume
atTime:kCMTimeZero];
[exporter exportAsynchronouslyWithCompletionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
switch ([exporter status]) {
case AVAssetExportSessionStatusFailed: {
NSLog(@"合成失败：%@",[[exporter error] description]);
completionBlock(NO,outputPath);
}
break;
case AVAssetExportSessionStatusCancelled: {
completionBlock(NO,outputPath);
}
break;
case AVAssetExportSessionStatusCompleted: {
completionBlock(YES,outputPath);
}
break;
default: {
completionBlock(NO,outputPath);
}
break;
}
});
}];
});
}
#pragma mark - 调节合成的音量
+ (AVAudioMix *)buildAudioMixWithVideoTrack:(AVCompositionTrack *)videoTrack
VideoVolume:(float)videoVolume
audioTrack:(AVCompositionTrack *)audioTrack
audioVolume:(float)audioVolume
atTime:(CMTime)volumeRange
{
AVMutableAudioMix *audioMix = [AVMutableAudioMix audioMix];
AVMutableAudioMixInputParameters *videoParameters = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:videoTrack];
[videoParameters setVolume:videoVolume atTime:volumeRange];
AVMutableAudioMixInputParameters *audioParameters = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:audioTrack];
[audioParameters setVolume:audioVolume atTime:volumeRange];
audioMix.inputParameters = @[videoParameters,audioParameters];
return audioMix;
}
#pragma mark - 视频输出路径
+ (NSURL *)exporterPathWithFileName:(NSString *)outPutfileName
{
NSString *fileName = [NSString stringWithFormat:@"%@.mp4",outPutfileName];
NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *directoryName = @"editVideo";
BOOL createDir = [self createDirWihtName:directoryName];
if (createDir) {
NSString *directory = [cachePath stringByAppendingPathComponent:directoryName];
NSString *outputFilePath = [directory stringByAppendingPathComponent:fileName];
if([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath]) {
[[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil];
}
return [NSURL fileURLWithPath:outputFilePath];
}
return nil;
}
/** 创建文件夹 */
+ (BOOL)createDirWihtName:(NSString *)name
{
if (!name) {
return NO;
}
NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *directory = [cachePath stringByAppendingPathComponent:name];
// 创建目录
BOOL res = [fileManager createDirectoryAtPath:directory withIntermediateDirectories:YES attributes:nil error:nil];
return res;
}
音频与音频的合成
#pragma mark - 音频与音频的合并
+ (void)mixOriginalAudio:(NSURL *)originalAudioPath
originalAudioVolume:(float)originalAudioVolume
bgAudioPath:(NSURL *)bgAudioPath
bgAudioVolume:(float)bgAudioVolume
outPutFileName:(NSString *)fileName
completionBlock:(CompletionBlock)completionBlock
{
if (originalAudioPath == nil) {
return;
}
if (bgAudioPath == nil) {
return;
}
if (originalAudioVolume > 1.0) {
originalAudioVolume = 1.0f;
}
if (originalAudioVolume < 0) {
originalAudioVolume = 0.0f;
}
if (bgAudioVolume > 1.0) {
bgAudioVolume = 1.0f;
}
if (bgAudioVolume < 0) {
bgAudioVolume = 0.0f;
}
dispatch_async(dispatch_get_global_queue(0, 0), ^{
AVURLAsset *originalAudioAsset = [AVURLAsset assetWithURL:originalAudioPath];
AVURLAsset *bgAudioAsset = [AVURLAsset assetWithURL:bgAudioPath];
AVMutableComposition *compostion = [AVMutableComposition composition];
AVMutableCompositionTrack *originalAudio = [compostion addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:0];
[originalAudio insertTimeRange:CMTimeRangeMake(kCMTimeZero, originalAudioAsset.duration) ofTrack:[originalAudioAsset tracksWithMediaType:AVMediaTypeAudio].firstObject atTime:kCMTimeZero error:nil];
AVMutableCompositionTrack *bgAudio = [compostion addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:0];
[bgAudio insertTimeRange:CMTimeRangeMake(kCMTimeZero, bgAudioAsset.duration) ofTrack:[bgAudioAsset tracksWithMediaType:AVMediaTypeAudio].firstObject atTime:kCMTimeZero error:nil];
/** 得到对应轨道中的音频声音信息，并更改 */
AVMutableAudioMixInputParameters *originalAudioParameters = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:originalAudio];
[originalAudioParameters setVolume:originalAudioVolume atTime:kCMTimeZero];
AVMutableAudioMixInputParameters *bgAudioParameters = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:bgAudio];
[originalAudioParameters setVolume:bgAudioVolume atTime:kCMTimeZero];
/** 赋给对应的类 */
AVMutableAudioMix *audioMix = [AVMutableAudioMix audioMix];
audioMix.inputParameters = @[originalAudioParameters,bgAudioParameters];
AVAssetExportSession *session = [[AVAssetExportSession alloc] initWithAsset:compostion presetName:AVAssetExportPresetAppleM4A];
/** 设置输出路径 */
NSURL *outputPath = [self exporterAudioPathWithFileName:fileName];
session.audioMix = audioMix;
session.outputURL = outputPath;
session.outputFileType = AVFileTypeAppleM4A;
session.shouldOptimizeForNetworkUse = YES;
[session exportAsynchronouslyWithCompletionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
switch ([session status]) {
case AVAssetExportSessionStatusFailed: {
NSLog(@"合成失败：%@",[[session error] description]);
completionBlock(NO,outputPath);
}
break;
case AVAssetExportSessionStatusCancelled: {
completionBlock(NO,outputPath);
}
break;
case AVAssetExportSessionStatusCompleted: {
completionBlock(YES,outputPath);
}
break;
default: {
completionBlock(NO,outputPath);
}
break;
}
});
}];
});
}
#pragma mark - 音频输出路径
+ (NSURL *)exporterAudioPathWithFileName:(NSString *)outPutfileName
{
NSString *fileName = [NSString stringWithFormat:@"%@.m4a",outPutfileName];
NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *directoryName = @"editAudio";
BOOL createDir = [self createDirWihtName:directoryName];
if (createDir) {
NSString *directory = [cachePath stringByAppendingPathComponent:directoryName];
NSString *outputFilePath = [directory stringByAppendingPathComponent:fileName];
if([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath]) {
[[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil];
}
return [NSURL fileURLWithPath:outputFilePath];
}
return nil;
}
/** 创建文件夹 */
+ (BOOL)createDirWihtName:(NSString *)name
{
if (!name) {
return NO;
}
NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *directory = [cachePath stringByAppendingPathComponent:name];
// 创建目录
BOOL res = [fileManager createDirectoryAtPath:directory withIntermediateDirectories:YES attributes:nil error:nil];
return res;
}
音视频的剪辑
#pragma mark - 剪辑音视频
+ (void)cutMediaWithMediaType:(LYZMediaType)mediaType
mediaPath:(NSURL *)mediaPath
startTime:(CGFloat)startTime
endTime:(CGFloat)endTime
outPutFileName:(NSString *)fileName
complitionBlock:(CompletionBlock)completionBlock
{
dispatch_async(dispatch_get_global_queue(0, 0), ^{
AVAsset *asset = [AVAsset assetWithURL:mediaPath];
AVAssetExportSession *exporter;
if (mediaType == LYZMediaTypeAudio) {
exporter = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetAppleM4A];
} else if (mediaType == LYZMediaTypeVideo) {
exporter = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
}
/** 剪辑(设置导出的时间段) */
CMTime start = CMTimeMakeWithSeconds(startTime, asset.duration.timescale);
CMTime duration = CMTimeMakeWithSeconds(endTime - startTime,asset.duration.timescale);
exporter.timeRange = CMTimeRangeMake(start, duration);
NSURL *outputPath;
if (mediaType == LYZMediaTypeAudio) {
exporter.outputFileType = AVFileTypeAppleM4A;
outputPath = [self exporterAudioPathWithFileName:fileName];
exporter.outputURL = [self exporterAudioPathWithFileName:fileName];
} else if (mediaType == LYZMediaTypeVideo) {
exporter.outputFileType = AVFileTypeAppleM4V;
outputPath = [self exporterPathWithFileName:fileName];
exporter.outputURL = [self exporterPathWithFileName:fileName];
}
exporter.shouldOptimizeForNetworkUse = YES;
/** 合成后的回调 */
[exporter exportAsynchronouslyWithCompletionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
switch ([exporter status]) {
case AVAssetExportSessionStatusFailed: {
NSLog(@"合成失败：%@",[[exporter error] description]);
completionBlock(NO,outputPath);
}
break;
case AVAssetExportSessionStatusCancelled: {
completionBlock(NO,outputPath);
}
break;
case AVAssetExportSessionStatusCompleted: {
completionBlock(YES,outputPath);
}
break;
default: {
completionBlock(NO,outputPath);
}
break;
}
});
}];
});
}
总结
以上就是个人总结的几个处理音视频的方法。以上方法我已封装成一个工具类，有需要请在这里下载。
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