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DEFINITIONS
This source file includes following definitions.
- ReadUYVYImage
- RegisterUYVYImage
- UnregisterUYVYImage
- WriteUYVYImage
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U U Y Y V V Y Y %
% U U Y Y V V Y Y %
% U U Y V V Y %
% U U Y V V Y %
% UUU Y V Y %
% %
% %
% Read/Write 16bit/pixel Interleaved YUV Image Format %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% Copyright 1999-2011 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
% %
% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% http://www.imagemagick.org/script/license.php %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/cache.h"
#include "magick/color.h"
#include "magick/colorspace.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/monitor.h"
#include "magick/monitor-private.h"
#include "magick/quantum-private.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/module.h"
/*
Forward declarations.
*/
static MagickBooleanType
WriteUYVYImage(const ImageInfo *,Image *);
/*
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% %
% %
% %
% R e a d U Y V Y I m a g e %
% %
% %
% %
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%
% ReadUYVYImage() reads an image in the UYVY format and returns it. It
% allocates the memory necessary for the new Image structure and returns a
% pointer to the new image.
%
% The format of the ReadUYVYImage method is:
%
% Image *ReadUYVYImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image_info: the image info.
%
% o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadUYVYImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
Image
*image;
ssize_t
y;
MagickBooleanType
status;
register ssize_t
x;
register PixelPacket
*q;
unsigned char
u,
v,
y1,
y2;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AcquireImage(image_info);
if ((image->columns == 0) || (image->rows == 0))
ThrowReaderException(OptionError,"MustSpecifyImageSize");
if ((image->columns % 2) != 0)
image->columns++;
(void) CopyMagickString(image->filename,image_info->filename,MaxTextExtent);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == MagickFalse)
return((Image *) NULL);
if (DiscardBlobBytes(image,image->offset) == MagickFalse)
ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
image->filename);
image->depth=8;
if (image_info->ping != MagickFalse)
{
(void) CloseBlob(image);
return(GetFirstImageInList(image));
}
/*
Accumulate UYVY, then unpack into two pixels.
*/
for (y=0; y < (ssize_t) image->rows; y++)
{
q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
if (q == (PixelPacket *) NULL)
break;
for (x=0; x < (ssize_t) (image->columns >> 1); x++)
{
u=(unsigned char) ReadBlobByte(image);
y1=(unsigned char) ReadBlobByte(image);
v=(unsigned char) ReadBlobByte(image);
y2=(unsigned char) ReadBlobByte(image);
q->red=ScaleCharToQuantum(y1);
q->green=ScaleCharToQuantum(u);
q->blue=ScaleCharToQuantum(v);
q++;
q->red=ScaleCharToQuantum(y2);
q->green=ScaleCharToQuantum(u);
q->blue=ScaleCharToQuantum(v);
q++;
}
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
image->colorspace=YCbCrColorspace;
if (EOFBlob(image) != MagickFalse)
ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
image->filename);
(void) CloseBlob(image);
return(GetFirstImageInList(image));
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r U Y V Y I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% RegisterUYVYImage() adds attributes for the UYVY image format to
% the list of supported formats. The attributes include the image format
% tag, a method to read and/or write the format, whether the format
% supports the saving of more than one frame to the same file or blob,
% whether the format supports native in-memory I/O, and a brief
% description of the format.
%
% The format of the RegisterUYVYImage method is:
%
% size_t RegisterUYVYImage(void)
%
*/
ModuleExport size_t RegisterUYVYImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("PAL");
entry->decoder=(DecodeImageHandler *) ReadUYVYImage;
entry->encoder=(EncodeImageHandler *) WriteUYVYImage;
entry->adjoin=MagickFalse;
entry->raw=MagickTrue;
entry->endian_support=MagickTrue;
entry->description=ConstantString("16bit/pixel interleaved YUV");
entry->module=ConstantString("UYVY");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("UYVY");
entry->decoder=(DecodeImageHandler *) ReadUYVYImage;
entry->encoder=(EncodeImageHandler *) WriteUYVYImage;
entry->adjoin=MagickFalse;
entry->raw=MagickTrue;
entry->endian_support=MagickTrue;
entry->description=ConstantString("16bit/pixel interleaved YUV");
entry->module=ConstantString("UYVY");
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r U Y V Y I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% UnregisterUYVYImage() removes format registrations made by the
% UYVY module from the list of supported formats.
%
% The format of the UnregisterUYVYImage method is:
%
% UnregisterUYVYImage(void)
%
*/
ModuleExport void UnregisterUYVYImage(void)
{
(void) UnregisterMagickInfo("PAL");
(void) UnregisterMagickInfo("UYVY");
}
/*
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% %
% %
% %
% W r i t e U Y V Y I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% WriteUYVYImage() writes an image to a file in the digital UYVY
% format. This format, used by AccomWSD, is not dramatically higher quality
% than the 12bit/pixel YUV format, but has better locality.
%
% The format of the WriteUYVYImage method is:
%
% MagickBooleanType WriteUYVYImage(const ImageInfo *image_info,
% Image *image)
%
% A description of each parameter follows.
%
% o image_info: the image info.
%
% o image: The image.
% Implicit assumption: number of columns is even.
%
*/
static MagickBooleanType WriteUYVYImage(const ImageInfo *image_info,
Image *image)
{
MagickPixelPacket
pixel;
Image
*uyvy_image;
ssize_t
y;
MagickBooleanType
full,
status;
register const PixelPacket
*p;
register ssize_t
x;
/*
Open output image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
if ((image->columns % 2) != 0)
image->columns++;
status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
if (status == MagickFalse)
return(status);
/*
Accumulate two pixels, then output.
*/
uyvy_image=CloneImage(image,0,0,MagickTrue,&image->exception);
if (uyvy_image == (Image *) NULL)
ThrowWriterException(ResourceLimitError,image->exception.reason);
(void) TransformImageColorspace(uyvy_image,YCbCrColorspace);
full=MagickFalse;
(void) ResetMagickMemory(&pixel,0,sizeof(MagickPixelPacket));
for (y=0; y < (ssize_t) image->rows; y++)
{
p=GetVirtualPixels(uyvy_image,0,y,image->columns,1,&image->exception);
if (p == (const PixelPacket *) NULL)
break;
for (x=0; x < (ssize_t) image->columns; x++)
{
if (full != MagickFalse)
{
pixel.green=(pixel.green+GetGreenPixelComponent(p))/2;
pixel.blue=(pixel.blue+GetBluePixelComponent(p))/2;
(void) WriteBlobByte(image,ScaleQuantumToChar((Quantum) pixel.green));
(void) WriteBlobByte(image,ScaleQuantumToChar((Quantum) pixel.red));
(void) WriteBlobByte(image,ScaleQuantumToChar((Quantum) pixel.blue));
(void) WriteBlobByte(image,ScaleQuantumToChar(GetRedPixelComponent(p)));
}
pixel.red=(double) GetRedPixelComponent(p);
pixel.green=(double) GetGreenPixelComponent(p);
pixel.blue=(double) GetBluePixelComponent(p);
full=full == MagickFalse ? MagickTrue : MagickFalse;
p++;
}
status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
uyvy_image=DestroyImage(uyvy_image);
(void) CloseBlob(image);
return(MagickTrue);
}