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//------------------------------------------------------------------------
// Copyright 2010 (c) Jeff Brown <spadix@users.sourceforge.net>
//
// This file is part of the ZBar Bar Code Reader.
//
// The ZBar Bar Code Reader is free software; you can redistribute it
// and/or modify it under the terms of the GNU Lesser Public License as
// published by the Free Software Foundation; either version 2.1 of
// the License, or (at your option) any later version.
//
// The ZBar Bar Code Reader is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser Public License for more details.
//
// You should have received a copy of the GNU Lesser Public License
// along with the ZBar Bar Code Reader; if not, write to the Free
// Software Foundation, Inc., 51 Franklin St, Fifth Floor,
// Boston, MA 02110-1301 USA
//
// http://sourceforge.net/projects/zbar
//------------------------------------------------------------------------
#import "ZBarCVImage.h"
#define MODULE ZBarCVImage
#import "debug.h"
static NSOperationQueue *conversionQueue;
static const void*
asyncProvider_getBytePointer (void *info)
{
// block until data is available
ZBarCVImage *image = info;
assert(image);
[image waitUntilConverted];
void *buf = image.rgbBuffer;
assert(buf);
return(buf);
}
static const CGDataProviderDirectCallbacks asyncProvider = {
.version = 0,
.getBytePointer = asyncProvider_getBytePointer,
.releaseBytePointer = NULL,
.getBytesAtPosition = NULL,
.releaseInfo = (void*)CFRelease,
};
@implementation ZBarCVImage
@synthesize pixelBuffer, rgbBuffer;
- (void) dealloc
{
self.pixelBuffer = NULL;
if(rgbBuffer) {
free(rgbBuffer);
rgbBuffer = NULL;
}
[conversion release];
conversion = nil;
[super dealloc];
}
- (void) setPixelBuffer: (CVPixelBufferRef) newbuf
{
CVPixelBufferRef oldbuf = pixelBuffer;
if(newbuf)
CVPixelBufferRetain(newbuf);
pixelBuffer = newbuf;
if(oldbuf)
CVPixelBufferRelease(oldbuf);
}
- (void) waitUntilConverted
{
// operation will at least have been queued already
NSOperation *op = [conversion retain];
if(!op)
return;
[op waitUntilFinished];
[op release];
}
- (UIImage*) UIImageWithOrientation: (UIImageOrientation) orient
{
if(!conversion && !rgbBuffer) {
// start format conversion in separate thread
NSOperationQueue *queue = conversionQueue;
if(!queue) {
queue = conversionQueue = [NSOperationQueue new];
queue.maxConcurrentOperationCount = 1;
}
else
[queue waitUntilAllOperationsAreFinished];
conversion = [[NSInvocationOperation alloc]
initWithTarget: self
selector: @selector(convertCVtoRGB)
object: nil];
[queue addOperation: conversion];
[conversion release];
}
// create UIImage before converted data is available
CGSize size = self.size;
int w = size.width;
int h = size.height;
CGDataProviderRef datasrc =
CGDataProviderCreateDirect([self retain], 3 * w * h, &asyncProvider);
CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
CGImageRef cgimg =
CGImageCreate(w, h, 8, 24, 3 * w, cs,
kCGBitmapByteOrderDefault, datasrc,
NULL, YES, kCGRenderingIntentDefault);
CGColorSpaceRelease(cs);
CGDataProviderRelease(datasrc);
UIImage *uiimg =
[UIImage imageWithCGImage: cgimg
scale: 1
orientation: orient];
CGImageRelease(cgimg);
return(uiimg);
}
// convert video frame to a CGImage compatible RGB format
// FIXME this is temporary until we can find the native way...
- (void) convertCVtoRGB
{
timer_start;
unsigned long format = self.format;
assert(format == zbar_fourcc('C','V','2','P'));
if(format != zbar_fourcc('C','V','2','P'))
return;
CVPixelBufferLockBaseAddress(pixelBuffer, kCVPixelBufferLock_ReadOnly);
int w = CVPixelBufferGetWidth(pixelBuffer);
int h = CVPixelBufferGetHeight(pixelBuffer);
int dy = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 0);
int duv = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 1);
uint8_t *py = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 0);
uint8_t *puv = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 1);
if(!py || !puv || dy < w || duv < w)
goto error;
int datalen = 3 * w * h;
// Quartz accesses some undocumented amount past allocated data?
// ...allocate extra to compensate
uint8_t *pdst = rgbBuffer = malloc(datalen + 3 * w);
if(!pdst)
goto error;
[self setData: rgbBuffer
withLength: datalen];
for(int y = 0; y < h; y++) {
const uint8_t *qy = py;
const uint8_t *quv = puv;
for(int x = 0; x < w; x++) {
int Y1 = *(qy++) - 16;
int Cb = *(quv) - 128;
int Cr = *(quv + 1) - 128;
Y1 *= 4769;
quv += (x & 1) << 1;
int r = (Y1 + 6537 * Cr + 2048) / 4096;
int g = (Y1 - 1604 * Cb - 3329 * Cr + 2048) / 4096;
int b = (Y1 + 8263 * Cb + 2048) / 4096;
r = (r | -!!(r >> 8)) & -((r >> 8) >= 0);
g = (g | -!!(g >> 8)) & -((g >> 8) >= 0);
b = (b | -!!(b >> 8)) & -((b >> 8) >= 0);
*(pdst++) = r;
*(pdst++) = g;
*(pdst++) = b;
}
py += dy;
if(y & 1)
puv += duv;
}
error:
CVPixelBufferUnlockBaseAddress(pixelBuffer, kCVPixelBufferLock_ReadOnly);
zlog(@"convert time %gs", timer_elapsed(t_start, timer_now()));
// release buffer as soon as conversion is complete
self.pixelBuffer = NULL;
conversion = nil;
}
@end
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