項目中需求收款后進行語音播報，IOS12之后使用了推送擴展方式，通過修改本地推送通知的sound來進行語音播報功能；但是IOS15更新后，發現原來循環發送本地推送的方式有問題，語音播出來停頓嚴重，所以需要尋求另外的方案來解決，所以想到對音頻進行合并，下面就是實例的代碼：
/**
* 音頻合并
*
* @param soundArr 資源文件數組
* @params completionBlock 執行完成的回調
*/
- (void)mergeAudioWithSoundArray:(NSArray *)soundArr completionBlock:(CompletionBlock)completionBlock
{
NSMutableArray <AVURLAsset *> *audioAssetArr = [NSMutableArray arrayWithCapacity:0];
// 音頻軌道數組
NSMutableArray <AVMutableCompositionTrack *> *audioCompositionTrackArr = [NSMutableArray arrayWithCapacity:0];
// 音頻素材軌道數組
NSMutableArray <AVAssetTrack *> *audioAssetTrackArr = [NSMutableArray arrayWithCapacity:0];
AVMutableComposition *audioCompostion = [AVMutableComposition composition];
for (NSString *soundStr in soundArr)
{
NSString *audioPath = [[NSBundle mainBundle] pathForResource:soundStr ofType:@"mp3"];
AVURLAsset *audioAsset = [AVURLAsset assetWithURL:[NSURL fileURLWithPath:audioPath]];
[audioAssetArr addObject:audioAsset];
// 音頻軌道
AVMutableCompositionTrack *audioCompositionTrack = [audioCompostion addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:0];
[audioCompositionTrackArr addObject:audioCompositionTrack];
// 音頻素材軌道
AVAssetTrack *audioAssetTrack = [[audioAsset tracksWithMediaType:AVMediaTypeAudio] firstObject];
[audioAssetTrackArr addObject:audioAssetTrack];
}
float audioDuration = 0.0f;
//設置拼接的時間，第一個音頻時為kCMTimeZero，第二個音頻時為第一個音頻的duration，第三個音頻時為第一個音頻.duration+第二個音頻.duration，第四個音頻時為第一個音頻.duration+第二個音頻.duration+第三個音頻.duration，后面的依次類推
CMTime cmTime = kCMTimeZero;
for (int i = 0; i < audioAssetArr.count; i ++)
{
if (i == 0) {
cmTime = kCMTimeZero;
} else {
cmTime = CMTimeAdd(cmTime, audioAssetArr[i-1].duration);
}
// 音頻合并 - 插入音軌文件
[audioCompositionTrackArr[i] insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAssetArr[i].duration) ofTrack:audioAssetTrackArr[i] atTime:cmTime error:nil];
// 將每個音頻的時間加起來
audioDuration += CMTimeGetSeconds(audioAssetArr[i].duration);
}
NSFileManager *fileManager = [NSFileManager defaultManager];
fileManager.delegate = self;
AVAssetExportSession *session = [[AVAssetExportSession alloc] initWithAsset:audioCompostion presetName:AVAssetExportPresetAppleM4A];
NSString *outPutFilePath = [[self.filePath stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"paySound.m4a"];
if ([[NSFileManager defaultManager] fileExistsAtPath:outPutFilePath])
{
[[NSFileManager defaultManager] removeItemAtPath:outPutFilePath error:nil];
}
session.outputURL = [NSURL fileURLWithPath:outPutFilePath];
session.outputFileType = @"com.apple.m4a-audio";
session.shouldOptimizeForNetworkUse = YES;
[session exportAsynchronouslyWithCompletionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
switch ([session status]) {
case AVAssetExportSessionStatusFailed: {
NSString *error = [[session error] description];
NSLog(@"合成失敗：%@", error);
completionBlock(NO, audioDuration);
} break;
case AVAssetExportSessionStatusCancelled: {
completionBlock(NO, audioDuration);
} break;
case AVAssetExportSessionStatusCompleted: {
//獲取分組的共享目錄
NSURL *groupURL = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:@"group.xxxx.appgroup"];//此處id要與開發者中心創建時一致
// 要先創建Sounds目錄，不然復制文件的時候會報Sounds不是一個目錄
NSURL *filePathURL = [groupURL URLByAppendingPathComponent:@"Library/Sounds"];
NSError *error = nil;
[fileManager createDirectoryAtURL:filePathURL withIntermediateDirectories:YES attributes:nil error:&error];
NSURL *fileURL = [groupURL URLByAppendingPathComponent:@"Library/Sounds/sound.m4a"];
// 每次都先刪除原來的文件
if ([[NSFileManager defaultManager] fileExistsAtPath:fileURL.path]) {
NSError *err = nil;
[[NSFileManager defaultManager] removeItemAtURL:fileURL error:&err];
}
// 復制文件到appgroup中
NSError *err = nil;
BOOL copyRes = [[NSFileManager defaultManager] copyItemAtPath:outPutFilePath toPath:fileURL.path error:&err];
completionBlock(copyRes, audioDuration);
} break;
default: {
completionBlock(NO, audioDuration);
} break;
}
});
}];
}
音頻合成導出的路徑
- (NSString *)filePath
{
if (!_filePath)
{
_filePath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).firstObject;
_filePath = [_filePath stringByAppendingPathComponent:@"user"];
NSFileManager *manage = [NSFileManager defaultManager];
if ([manage createDirectoryAtPath:_filePath withIntermediateDirectories:YES attributes:nil error:nil])
{
_filePath = [_filePath stringByAppendingPathComponent:@"testAudio.aac"];
}
tempName = mp3Name;
}
合成語音后，發本地推送，修改聲音
UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
UNMutableNotificationContent *content = [[UNMutableNotificationContent alloc] init];
content.sound = [UNNotificationSound soundNamed:[NSString stringWithFormat:@"sound.m4a"]];
content.userInfo = @{@"locationPlaySound":@"1"};
if (@available(iOS 15, *)) {
// IOS15必須設置title或者body才能播放自定義的語音
content.body = [NSString localizedUserNotificationStringForKey:@"支付收款到賬" arguments:nil];
}
UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:0.1 repeats:NO];
NSString *identifier = [NSString stringWithFormat:@"%@-%f",@"noticeId",audioDuration];
UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:identifier content:content trigger:trigger];
[center addNotificationRequest:request withCompletionHandler:^(NSError *_Nullable error) {
// 等語音播報完后再通知系統本地通知完成了，避免收到其他推送信息中斷語音播報
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, audioDuration * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
completed();
});
}];
