【iOS】音频系统方法格式转换,获取音频信息获取

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直接上代码

#import <MobileCoreServices/MobileCoreServices.h>
#import <AudioToolbox/AudioToolbox.h>
#import <AudioUnit/AudioUnit.h>
#import <AVFoundation/AVFoundation.h>/// ogg,amr,acc 格式无法使用
@interface YSAudioTool : NSObject
+ (AudioFileID)getAudioFileID:(NSURL *)fileUrl;
+ (NSDictionary *)getAuidoBaseInfo:(AudioFileID)audioId;
+ (NSString *)getFileFormat:(AudioFileID)audioId showNormalType:(BOOL)flag;
+ (void)playAuido:(NSURL *)fileUrl;
@end

#import "YSAudioTool.h"@interface YSAudioTool()
+ (NSString *)fileFormatCovert:(NSString*)file;
@end@implementation YSAudioTool+ (AudioFileID)getAudioFileID:(NSURL *)fileUrl {AudioFileID fileID;AudioFileOpenURL((__bridge CFURLRef)fileUrl, kAudioFileReadWritePermission,kAudioFileWAVEType, &fileID);return fileID;
}/// 获取音频信息， 编码.声道数.采样率
/// @param audioId  音频文件id
+ (NSDictionary *)getAuidoBaseInfo:(AudioFileID)audioId {NSMutableDictionary * result = [NSMutableDictionary new];UInt32 formatListSize = 0;OSStatus status = AudioFileGetPropertyInfo(audioId, kAudioFilePropertyFormatList, &formatListSize, NULL);if (status == noErr) {AudioFormatListItem *formatList = (AudioFormatListItem *)malloc(formatListSize);status = AudioFileGetProperty(audioId, kAudioFilePropertyFormatList, &formatListSize, formatList);for (int i = 0; i * sizeof(AudioFormatListItem) < formatListSize; i += sizeof(AudioFormatListItem)){AudioStreamBasicDescription pasbd = formatList[i].mASBD;//选择需要的格式。。switch (pasbd.mFormatID) {case kAudioFormatAC3:result[@"acodec"] = @"aac";break;case kAudioFormatOpus:result[@"acodec"] = @"opus";break;case kAudioFormatLinearPCM:result[@"acodec"] = @"pcm";break;case kAudioFormatMPEGLayer3:result[@"acodec"] = @"mp3";break;default:result[@"acodec"] = @"unknow";break;}UInt32 channel = pasbd.mChannelsPerFrame;   // 声道result[@"channelNumber"] = @(channel);result[@"sampleRate"] = @(pasbd.mSampleRate);free(formatList);}}return result;
}/// 获取音频 文件类型
/// @param audioId  音频文件id
+ (NSString *)getFileFormat:(AudioFileID)audioId showNormalType:(BOOL)flag {char * result ;UInt32 formatListSize = 0;OSStatus status = AudioFileGetPropertyInfo(audioId, kAudioFilePropertyFileFormat, &formatListSize, NULL);result = (char *)malloc(formatListSize);status = AudioFileGetProperty(audioId, kAudioFilePropertyFileFormat, &formatListSize, result);NSMutableString *tranformFormat = [NSMutableString new];for (long i = strlen(result) -1; i >= 0; i--) {[tranformFormat appendFormat:@"%c", result[i]];}if (flag) {return [YSAudioTool fileFormatCovert:tranformFormat];}return tranformFormat;
}+ (NSString *)fileFormatCovert:(NSString*)file {NSDictionary *params = @{@"MPG3": @"mp3",@"WAVE": @"wav",@"MPG3": @"mp3"};return params[file];
}+ (void)playAuido:(NSURL *)fileUrl {SystemSoundID soundID;AudioServicesCreateSystemSoundID((__bridge CFURLRef)fileUrl, &soundID);AudioServicesPlaySystemSound(soundID);
}/**把mp3->wav; wav->wav;格式(ogg 不能转换，acc 不能转换)@param originalUrlStr .m4a文件路径@param destUrlStr .wav文件路径@param completed 转化完成的block*/
+ (void)convetM4aToWav:(NSString *)originalUrlStrdestUrl:(NSString *)destUrlStrcompleted:(void (^)(NSError *error)) completed {if ([[NSFileManager defaultManager] fileExistsAtPath:destUrlStr]) {[[NSFileManager defaultManager] removeItemAtPath:destUrlStr error:nil];}NSURL *originalUrl = [NSURL fileURLWithPath:originalUrlStr];NSURL *destUrl     = [NSURL fileURLWithPath:destUrlStr];AVURLAsset *songAsset = [AVURLAsset URLAssetWithURL:originalUrl options:nil];NSLog(@"finallUrl: %@", destUrl);//读取原始文件信息NSError *error = nil;AVAssetReader *assetReader = [AVAssetReader assetReaderWithAsset:songAsset error:&error];NSArray<AVMetadataItem *> *a = assetReader.asset.metadata;for (int i = 0; i < a.count; i++) {NSString* type =  a[i].dataType;NSLog(@"%@", type);}NSArray<AVMetadataFormat> * b = assetReader.asset.availableMetadataFormats;for (int i = 0; i < b.count; i++) {NSString* type =  b[i].pathExtension;NSLog(@"%@", type);}AVMediaSelection *selection = assetReader.asset.preferredMediaSelection;NSArray<AVMetadataItem *> *c = selection.asset.metadata;for (int i = 0; i < a.count; i++) {NSString* type =  c[i].dataType;NSLog(@"%@", type);}// 采样率CMTimeScale sample = assetReader.asset.duration.timescale;NSLog(@"asdfasdfsdf %d", sample);if (songAsset.tracks.count <= 0) {return;}AVAssetReaderOutput *assetReaderOutput = [AVAssetReaderAudioMixOutputassetReaderAudioMixOutputWithAudioTracks:songAsset.tracksaudioSettings: nil];if (![assetReader canAddOutput:assetReaderOutput]) {NSLog(@"can't add reader output... die!");completed(error);return;}[assetReader addOutput:assetReaderOutput];AVAssetWriter *assetWriter = [AVAssetWriter assetWriterWithURL:destUrlfileType:AVFileTypeWAVEerror:&error];if (error) {NSLog(@"error: %@", error);completed(error);return;}AudioChannelLayout channelLayout;memset(&channelLayout, 0, sizeof(AudioChannelLayout));channelLayout.mChannelLayoutTag = kAudioChannelLayoutTag_Stereo;NSDictionary *outputSettings = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:kAudioFormatLinearPCM], AVFormatIDKey,[NSNumber numberWithFloat:8000], AVSampleRateKey,[NSNumber numberWithInt:1], AVNumberOfChannelsKey,[NSNumber numberWithInt:16], AVLinearPCMBitDepthKey,[NSNumber numberWithBool:NO], AVLinearPCMIsNonInterleaved,[NSNumber numberWithBool:NO],AVLinearPCMIsFloatKey,[NSNumber numberWithBool:NO], AVLinearPCMIsBigEndianKey,nil];AVAssetWriterInput *assetWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeAudiooutputSettings:outputSettings];if ([assetWriter canAddInput:assetWriterInput]) {[assetWriter addInput:assetWriterInput];} else {NSLog(@"can't add asset writer input... die!");if (completed != nil) {completed(error);}return;}assetWriterInput.expectsMediaDataInRealTime = NO;[assetWriter startWriting];[assetReader startReading];AVAssetTrack *soundTrack = [songAsset.tracks objectAtIndex:0];CMTime startTime = CMTimeMake (0, soundTrack.naturalTimeScale);[assetWriter startSessionAtSourceTime:startTime];__block UInt64 convertedByteCount = 0;dispatch_queue_t mediaInputQueue = dispatch_queue_create("mediaInputQueue", NULL);[assetWriterInput requestMediaDataWhenReadyOnQueue:mediaInputQueueusingBlock: ^{while (assetWriterInput.readyForMoreMediaData) {CMSampleBufferRef nextBuffer = [assetReaderOutput copyNextSampleBuffer];if (nextBuffer) {// append buffer[assetWriterInput appendSampleBuffer: nextBuffer];NSLog(@"appended a buffer (%zu bytes)",CMSampleBufferGetTotalSampleSize (nextBuffer));convertedByteCount += CMSampleBufferGetTotalSampleSize (nextBuffer);} else {[assetWriterInput markAsFinished];[assetWriter finishWritingWithCompletionHandler:^{}];[assetReader cancelReading];NSDictionary *outputFileAttributes = [[NSFileManager defaultManager]attributesOfItemAtPath:[destUrl path]error:nil];NSLog(@"FlyElephant %lld",[outputFileAttributes fileSize]);break;}}NSLog(@"转换结束");// 删除临时temprecordAudio.m4a文件NSError *removeError = nil;if ([[NSFileManager defaultManager] fileExistsAtPath:originalUrlStr]) {BOOL success = [[NSFileManager defaultManager] removeItemAtPath:originalUrlStr error:&removeError];if (!success) {NSLog(@"删除临时temprecordAudio.m4a文件失败:%@",removeError);completed(removeError);}else{NSLog(@"删除临时temprecordAudio.m4a文件:%@成功",originalUrlStr);if (completed != nil) {completed(removeError);}}}}];
}@end