我正在开发一个应用程序,供用户将视频上传到我们的 FTP 服务器
到目前为止,一切都差不多完成了,但我遇到一个问题,就是用户上传视频(.MOV)后,我无法打开和播放文件。
quicktime播放器返回的错误信息是“无法打开,因为无法识别电影的文件格式”
在我的代码中,我让用户使用 ALAssetsLibrady 选择视频
然后将视频加载到一个 ALAsset 对象中,在开始上传之前,从 ALAsset 中将视频加载到一个 NSInputStream 对象中,这是代码。
ALAssetRepresentation *rep = [currentAsset defaultRepresentation];
Byte *buffer = (Byte*)malloc(rep.size);
NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:rep.size error:nil];
NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];
iStream = [NSInputStream inputStreamWithData:data];
[iStream open];
下一步是设置一个NSOutputStream并打开它,通过下面的代码处理上传操作。
- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode
{
switch (eventCode) {
case NSStreamEventNone:
{
break;
}
case NSStreamEventOpenCompleted:
{
//opened connection
NSLog(@"opened connection");
break;
}
case NSStreamEventHasBytesAvailable:
{
// should never happen for the output stream
[self stopSendWithStatus:@"should never happen for the output stream"];
break;
}
case NSStreamEventHasSpaceAvailable:
{
// If we don't have any data buffered, go read the next chunk of data.
NSInteger bufferSize = 65535;
uint8_t *buffer = malloc(bufferSize);
if (bufferOffset == bufferLimit) {
NSInteger bytesRead = [iStream read:buffer maxLength:bufferSize];
if (bytesRead == -1) {
[self stopSendWithStatus:@"file read error"];
} else if (bytesRead == 0) {
[self stopSendWithStatus:nil];
} else {
bufferOffset = 0;
bufferLimit = bytesRead;
}
}
// If we're not out of data completely, send the next chunk.
if (bufferOffset != bufferLimit) {
NSInteger bytesWritten = [oStream write:&buffer[bufferOffset] maxLength:bufferLimit - bufferOffset];
if (bytesWritten == -1) {
[self stopSendWithStatus:@"file write error"];
} else {
bufferOffset += bytesWritten;
}
}
//NSLog(@"available");
break;
}
case NSStreamEventErrorOccurred:
{
//stream open error
[self stopSendWithStatus:[[aStream streamError] description]];
break;
}
case NSStreamEventEndEncountered: //ignore
NSLog(@"end");
break;
}
}
没有任何错误发生,视频文件以正确的文件大小和名称上传到 FTP,但就是打不开。
有人知道任何线索吗?
最佳答案
我已经为流式 ALAsset 对象制作了 NSInputStream 实现 - POSInputStreamLibrary .它不会将整个 1GB 视频读入内存作为您的解决方案,而是读取带有 block 的电影。当然这不是 POSBlobInputStream 的唯一特点。更多信息,请访问我的 GitHub 存储库。
关于iphone - 从 iDevice 上传视频到 FTP,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13006261/