// 获取视频第一帧
- (UIImage*) getVideoPreViewImage:(AVURLAsset*)asset
{
AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];
// 设定缩略图的方向
// 如果不设定，可能会在视频旋转90/180/270°时，获取到的缩略图是被旋转过的，而不是正向的
gen.appliesPreferredTrackTransform = YES;
gen.apertureMode = AVAssetImageGeneratorApertureModeEncodedPixels;
// 设置图片的最大size(分辨率)
gen.maximumSize = CGSizeMake(300, 169);
CMTime time = CMTimeMakeWithSeconds(0.0, 10); //取第0秒，一秒钟600帧
NSError*error =nil;
CMTimeactualTime;
CGImageRefimage = [gencopyCGImageAtTime:timeactualTime:&actualTimeerror:&error];
if(error) {
UIImage*placeHoldImg = [UIImageimageNamed:@"付费页"];
returnplaceHoldImg;
}
UIImage *thumb = [[UIImage alloc] initWithCGImage:image];
CGImageRelease(image);
returnthumb;
}
这个方法有时候会崩溃
//获取m3u8视频帧画面
- (UIImage*)getPixelBufferForItem:(AVPlayerItem*)playerItem{
AVPlayerItemVideoOutput *output = [[AVPlayerItemVideoOutput alloc] init];
[playerItemaddOutput:output];
CVPixelBufferRef ref =[output copyPixelBufferForItemTime:CMTimeMake(1000, 60) itemTimeForDisplay:nil];
UIImage*image = [selfCVImageToUIImage:ref];
returnimage;
}
//CVPixelBufferRef转UIImage
- (UIImage*)CVImageToUIImage:(CVPixelBufferRef)imageBuffer{
CVPixelBufferLockBaseAddress(imageBuffer, 0);
void*baseAddress =CVPixelBufferGetBaseAddress(imageBuffer);
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
size_tbufferSize =CVPixelBufferGetDataSize(imageBuffer);
size_t bytesPerRow = CVPixelBufferGetBytesPerRowOfPlane(imageBuffer, 0);
CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
CGDataProviderRefprovider =CGDataProviderCreateWithData(NULL, baseAddress, bufferSize,NULL);
CGImageRef cgImage = CGImageCreate(width, height, 8, 32, bytesPerRow, rgbColorSpace, kCGImageAlphaNoneSkipFirst|kCGBitmapByteOrder32Little, provider, NULL, true, kCGRenderingIntentDefault);
UIImage *image = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
CGDataProviderRelease(provider);
CGColorSpaceRelease(rgbColorSpace);
NSData* imageData = UIImageJPEGRepresentation(image, 1.0);
image = [UIImageimageWithData:imageData];
CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
returnimage;
}
//获取视频中的音频素材
[selfsetUpAndAddAudioAtPath:urlAssettoComposition:compositionstart:startTimedura:trackDurationoffset: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:@"/%@.m4a"];
NSString* movDirectory = [pathstringByAppendingPathComponent:
[NSStringstringWithFormat:@"/%@.m4a",[selfgetCurrentTimes]]];
if([[NSFileManager defaultManager]fileExistsAtPath:movDirectory]) {
[[NSFileManager defaultManager]removeItemAtPath:movDirectory error:nil];
}
NSURL*exportURL =[NSURLfileURLWithPath:movDirectory];
exporter.outputURL= exportURL;
MAKAudioObject * object = [[MAKAudioObject alloc]init];
object.url= movDirectory;
object.name= [movDirectorysubstringFromIndex:movDirectory.length-19];
object.localam = [movDirectorysubstringFromIndex:movDirectory.length-19];
[exporterexportAsynchronouslyWithCompletionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"Export status not yet completed. Error: %@", exporter.error.description);
if (exporter.status == AVAssetExportSessionStatusCompleted) {
NSURL* outputURL = exporter.outputURL;
AVURLAsset*songAsset = [AVURLAssetURLAssetWithURL:outputURLoptions:nil];
NSData* data = [NSDatadataWithContentsOfFile:movDirectory];
NSLog(@"data:%@",data);
object.time=[NSStringstringWithFormat:@"%.2f",CMTimeGetSeconds(songAsset.duration)];
NSNumber*size;
[songAsset.URLgetResourceValue:&sizeforKey:NSURLFileSizeKeyerror: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]) {
[selfbackButtonclick];
}
}
});
}];
-(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];
}
-(NSString*)getCurrentTimes{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
// ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制
[formattersetDateFormat:@"YYYYMMdd_HHmmss"];
//现在时间,你可以输出来看下是什么格式
NSDate*datenow = [NSDatedate];
//----------将nsdate按formatter格式转成nsstring
NSString*currentTimeString = [formatterstringFromDate:datenow];
NSLog(@"currentTimeString = %@",currentTimeString);
returncurrentTimeString;
}
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