和在视频中获取音频方式差不多
if (self.totalTime >=_cutendTime) {
__weaktypeof(self) weakSelf =self;
NSArray *paths =NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,NSUserDomainMask,YES);
NSString*path=[pathsobjectAtIndex:0];
//NSString *movDirectory = [path stringByAppendingPathComponent:@"/%@.m4a"];
NSString* movDirectory = [pathstringByAppendingPathComponent:
[NSStringstringWithFormat:@"/%@.m4a",[selfgetCurrentTimes]]];
//self.confirmBlock(self->_cutstartTime, self->_cutendTime);
[self exportPath:movDirectory withFilePath:self.musicPath withStartTime:_cutstartTime withEndTime:(int64_t)_cutendTime withBlock:^(BOOL ret) {
__strongtypeof(weakSelf) strongSelf = weakSelf;
weakSelf.confirmBlock(strongSelf->_cutstartTime, strongSelf->_cutendTime);
}];
}
// 支持音频:m4a 视频:mp4
-(void)setUpAndAddAudioAtPath:(AVURLAsset*)songAsset toComposition:(AVMutableComposition*)composition start:(CMTime)start dura:(CMTime)dura offset:(CMTime)offset andArray:(NSMutableArray*)audioMixParams{
AVMutableCompositionTrack *track = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *sourceAudioTrack = [[songAsset tracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0];
NSError*error =nil;
BOOLok =NO;
CMTimestartTime = start;
CMTimetrackDuration = dura;
CMTimeRangetRange =CMTimeRangeMake(startTime,trackDuration);
//设置音量
//AVMutableAudioMixInputParameters（输入参数可变的音频混合）
//audioMixInputParametersWithTrack（音频混音输入参数与轨道）
//AVMutableAudioMixInputParameters *trackMix = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:track];
//[trackMix setVolume:0.8f atTime:startTime];
//素材加入数组
//[audioMixParams addObject:trackMix];
//Insert audio into track //offsetCMTimeMake(0, 44100)
ok = [trackinsertTimeRange:tRangeofTrack:sourceAudioTrackatTime:kCMTimeInvaliderror:&error];
}
- (void)exportPath:(NSString *)exportPath
withFilePath:(NSString *)filePath
withStartTime:(int64_t)startTime
withEndTime:(int64_t)endTime
withBlock:(success)handle
{
_block= handle;
NSString*presetName;
NSString*outputFileType;
if ([filePath.lastPathComponent containsString:@"m4a"]){
presetName =AVAssetExportPresetAppleM4A;
outputFileType =AVFileTypeAppleM4A;
}else{
_block(NO); return;
}
// 1.拿到预处理音频文件
NSURL*songURL = [NSURLfileURLWithPath:filePath];
AVURLAsset *songAsset = [AVURLAsset URLAssetWithURL:songURL options:nil];
// 2.创建新的音频文件
if ([[NSFileManager defaultManager] fileExistsAtPath:exportPath]) {
[[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil];
}
CMTime_startTime =CMTimeMake(startTime,1);
CMTime_stopTime =CMTimeMake(endTime,1);
AVMutableComposition *composition =[AVMutableComposition composition];
NSMutableArray *audioMixParams = [NSMutableArray array];
//获取视频中的音频素材
[selfsetUpAndAddAudioAtPath:songAssettoComposition:compositionstart:_startTimedura:_stopTimeoffset:CMTimeMake(14*44100,44100)andArray:audioMixParams];
//创建一个可变的音频混合
AVMutableAudioMix *audioMix =[AVMutableAudioMix audioMix];
audioMix.inputParameters =[NSArray arrayWithArray:audioMixParams];//从数组里取出处理后的音频轨道参数
//创建一个输出
AVAssetExportSession *exporter =[[AVAssetExportSession alloc]
initWithAsset:composition
presetName:AVAssetExportPresetAppleM4A];
exporter.audioMix= audioMix;
exporter.outputFileType=@"com.apple.m4a-audio";
//视频的声音，合成后存储
// NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,NSUserDomainMask,YES);
// NSString*path=[paths objectAtIndex:0];
//
//
// NSString * movDirectory = [path stringByAppendingPathComponent:
// [NSString stringWithFormat:@"/%@.m4a",[self getCurrentTimes]]];
if([[NSFileManager defaultManager]fileExistsAtPath:exportPath]) {
[[NSFileManager defaultManager]removeItemAtPath:exportPath error:nil];
}
NSURL*exportURL =[NSURLfileURLWithPath:exportPath];
exporter.outputURL= exportURL;
MAKAudioObject * object = [[MAKAudioObject alloc]init];
object.url= exportPath;
object.name= [exportPathsubstringFromIndex:exportPath.length-19];
object.localam = [exportPathsubstringFromIndex:exportPath.length-19];
__weaktypeof(self) weakSelf =self;
[exporterexportAsynchronouslyWithCompletionHandler:^{
__strongtypeof(weakSelf) strongSelf = weakSelf;
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"Export status not yet completed. Error: %@", exporter.error.description);
if (exporter.status == AVAssetExportSessionStatusCompleted) {
NSURL*songURL = [NSURLfileURLWithPath:exportPath];
AVURLAsset*songAsset = [AVURLAssetURLAssetWithURL:songURLoptions:nil];
object.time =[NSString stringWithFormat:@"%.2f",CMTimeGetSeconds(songAsset.duration)];
NSData* data = [NSDatadataWithContentsOfFile:exportPath];
NSLog(@"data:%@",data);
NSNumber*size;
[songAsset.URL getResourceValue:&size forKey:NSURLFileSizeKey error:nil];
NSLog(@"size is %.2f",[sizefloatValue]/(1024.0*1024.0));//size is 43.703005
object.cunchu=[NSStringstringWithFormat:@"%.2fMb",[sizefloatValue]/(1024.0*1024.0)];
if ( [[MAKAudioMusicDBManager sharedManager] insertAudioWith:object]) {
strongSelf->_block(YES);
}else{
strongSelf->_block(NO);
}
}else{
strongSelf->_block(NO);
}
});
}];
}
