ios - 我如何获得录制音频文件的最大限制？

Question

目前我正在使用 AVAudioSession 在 iOS 中录制音频，但录制超过 50 分钟时会出现问题。超过 50 分钟重新编码无法使用 AVAudioPlayer 播放。

谁能告诉录制音频的最大限制是多少。

Answer 1

iPhone 中的录制文件没有限制。但在保存到应用程序文档目录之前。检查 iPhone 上的可用空间，然后保存，这样丢失文件的几率就会降低。

下面的代码用于检查 iPhone 中的可用空间。

-(uint64_t)getFreeDiskspace {
    NSString *folderPath = [[NSBundle mainBundle] bundlePath];
    NSArray *filesArray = [[NSFileManager defaultManager] subpathsOfDirectoryAtPath:folderPath error:nil];
    NSEnumerator *filesEnumerator = [filesArray objectEnumerator];
    NSString *fileName;
    unsigned long long int fileSize = 0;

    while (fileName = [filesEnumerator nextObject]) {
        NSDictionary *fileDictionary = [[NSFileManager defaultManager] fileAttributesAtPath:[folderPath stringByAppendingPathComponent:fileName] traverseLink:YES];
        fileSize += [fileDictionary fileSize];
    }

    NSLog(@"App size : %lld",fileSize);
    uint64_t totalSpace = 0;
    uint64_t totalFreeSpace = 0;
    NSError *error = nil;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSDictionary *dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:[paths lastObject] error: &error];

    NSError *attributesError = nil;

    NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:[paths lastObject] error:&attributesError];

    NSLog(@"App Directory size %llu",[fileAttributes fileSize]);

    if (dictionary) {
        NSNumber *fileSystemSizeInBytes = [dictionary objectForKey: NSFileSystemSize];
        NSNumber *freeFileSystemSizeInBytes = [dictionary objectForKey:NSFileSystemFreeSize];
        totalSpace = [fileSystemSizeInBytes unsignedLongLongValue];
        totalFreeSpace = [freeFileSystemSizeInBytes unsignedLongLongValue];
        NSLog(@"Memory Capacity of %llu MiB with %llu MiB Free memory available.", ((totalSpace)), ((totalFreeSpace)));
    } else {
        NSLog(@"Error Obtaining System Memory Info: Domain = %@, Code = %ld", [error domain], (long)[error code]);
    }
//    NSLog(@"DISK SPACE %f",[self diskSpace]);
//    NSLog(@"GET FREE SPACE %lld",[self getFreeSpace]);
    return totalFreeSpace;
}
- (long long)getFreeSpace
{
    long long freeSpace = 0.0f;
    NSError *error = nil;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSDictionary *dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:[paths lastObject] error: &error];

    if (dictionary) {
        NSNumber *fileSystemFreeSizeInBytes = [dictionary objectForKey: NSFileSystemFreeSize];
        freeSpace = [fileSystemFreeSizeInBytes longLongValue];
    } else {
        //Handle error
        NSLog(@"Error Obtaining System Memory Info: Domain = %@, Code = %ld", [error domain], (long)[error code]);
    }
    NSLog(@"Free Space %lli",freeSpace);
    return (freeSpace);
}