Get video NSData from ALAsset url iOS

Question

I am not able to retrieve NSData from the url that I get from ALAsset

Below is the code I tried:- I always get NSData as nil.

 NSData *webData = [NSData dataWithContentsOfURL:[asset defaultRepresentation].url];

I also tried something like this

 NSData *webData1 = [NSData dataWithContentsOfURL:[[asset valueForProperty:ALAssetPropertyURLs] valueForKey:[[[asset valueForProperty:ALAssetPropertyURLs] allKeys] objectAtIndex:0]]];

The url that I get from the ALAsset:-

assets-library://asset/asset.MOV?id=1000000116&ext=MOV

I have tried this below link which works but I need to unnecessary write to a temp location which is very time consuming.

Getting video from ALAsset

Any hint in right direction would be highly appreciated.

Waiting for your replies

Answer 1

try this code:-

ALAssetRepresentation *rep = [asset defaultRepresentation];
Byte *buffer = (Byte*)malloc((NSUInteger)rep.size);
NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:(NSUInteger)rep.size error:nil];
NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];

Answer 2

Byte buffer = (Byte)malloc(rep.size); if the rep.size is so big, maybe 300M,that will be crash. so try this code:

+ (BOOL)writeDataToPath:(NSString*)filePath andAsset:(ALAsset*)asset
{
    [[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil];
    NSFileHandle *handle = [NSFileHandle fileHandleForWritingAtPath:filePath];
    if (!handle) {
        return NO;
    }
    static const NSUInteger BufferSize = 1024*1024;

    ALAssetRepresentation *rep = [asset defaultRepresentation];
    uint8_t *buffer = calloc(BufferSize, sizeof(*buffer));
    NSUInteger offset = 0, bytesRead = 0;

    do {
        @try {
            bytesRead = [rep getBytes:buffer fromOffset:offset length:BufferSize error:nil];
            [handle writeData:[NSData dataWithBytesNoCopy:buffer length:bytesRead freeWhenDone:NO]];
            offset += bytesRead;
        } @catch (NSException *exception) {
            free(buffer);

            return NO;
        }
    } while (bytesRead > 0);

    free(buffer);
    return YES;
}