Get upright frames from AVPlayerItemVideoOutput when video has rotated exif orientation - ios

Question

I'm using an AVPlayerItemVideoOutput to get video frames from an AVPlayer and upload them to a GL texture for display. The issue is that AVPlayerItemVideoOutput seems to ignore the video's rotation exif data, so the CVPixelBufferRef it returns isn't upright.
Options:
I could edit my GL code to counter rotate the texture when displaying it, but i'd kind of prefer to get the frames upright in the first place so I don't have to transform the texture coordinates.
Some magic to get AVPlayerItemVideoOutput to give me the frames upright in the first place. Solution must be hardware accelerated.
code:
//
// Setup
//
AVPlayer *player = [AVPlayer playerWithURL:fileURL];
AVPlayerItemVideoOutput *output = [[AVPlayerItemVideoOutput alloc] initWithPixelBufferAttributes:#{
(id)kCVPixelBufferPixelFormatTypeKey: #(kCVPixelFormatType_32ARGB),
(id)kCVPixelBufferOpenGLCompatibilityKey: #YES,
}];
[player.currentItem addOutput:output];
//
// getting the frame data into a GL texture
//
CMTime currentTime = player.currentTime;
if ([output hasNewPixelBufferForItemTime:currentTime]){
CVPixelBufferRef frame = [output copyPixelBufferForItemTime:currentTime itemTimeForDisplay:NULL];
CVPixelBufferLockBaseAddress(frame, kCVPixelBufferLock_ReadOnly);
GLsizei height = (GLsizei)CVPixelBufferGetHeight(frame);
GLsizei bpr = (GLsizei)CVPixelBufferGetBytesPerRow(frame);
void *data = CVPixelBufferGetBaseAddress(frame);
glBindTexture(GL_TEXTURE_2D, gltexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bpr/4, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8, data);
CVPixelBufferUnlockBaseAddress(frame, kCVPixelBufferLock_ReadOnly);
CVPixelBufferRelease(frame);
}