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DEFINITIONS
This source file includes following definitions.
- IsAVI
- IsMPEG
- ReadMPEGImage
- RegisterMPEGImage
- UnregisterMPEGImage
- CopyDelegateFile
- WriteMPEGImage
/*
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% %
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% M M PPPP EEEEE GGGG %
% MM MM P P E G %
% M M M PPPP EEE G GG %
% M M P E G G %
% M M P EEEEE GGGG %
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% Read/Write MPEG Image Format %
% %
% Software Design %
% Cristy %
% July 1999 %
% %
% %
% Copyright 1999-2015 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/constitute.h"
#include "magick/delegate.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/geometry.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/layer.h"
#include "magick/list.h"
#include "magick/log.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/pixel-accessor.h"
#include "magick/quantum-private.h"
#include "magick/resource_.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/module.h"
#include "magick/transform.h"
#include "magick/utility.h"
#include "magick/utility-private.h"
/*
Forward declarations.
*/
static MagickBooleanType
WriteMPEGImage(const ImageInfo *image_info,Image *image);
/*
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% I s A V I %
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%
% IsAVI() returns MagickTrue if the image format type, identified by the
% magick string, is Audio/Video Interleaved file format.
%
% The format of the IsAVI method is:
%
% size_t IsAVI(const unsigned char *magick,const size_t length)
%
% A description of each parameter follows:
%
% o magick: compare image format pattern against these bytes.
%
% o length: Specifies the length of the magick string.
%
*/
static MagickBooleanType IsAVI(const unsigned char *magick,const size_t length)
{
if (length < 4)
return(MagickFalse);
if (memcmp(magick,"RIFF",4) == 0)
return(MagickTrue);
return(MagickFalse);
}
/*
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% I s M P E G %
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%
% IsMPEG() returns MagickTrue if the image format type, identified by the
% magick string, is MPEG.
%
% The format of the IsMPEG method is:
%
% MagickBooleanType IsMPEG(const unsigned char *magick,const size_t length)
%
% A description of each parameter follows:
%
% o magick: compare image format pattern against these bytes.
%
% o length: Specifies the length of the magick string.
%
*/
static MagickBooleanType IsMPEG(const unsigned char *magick,const size_t length)
{
if (length < 4)
return(MagickFalse);
if (memcmp(magick,"\000\000\001\263",4) == 0)
return(MagickTrue);
return(MagickFalse);
}
/*
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% R e a d M P E G I m a g e %
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%
% ReadMPEGImage() reads an binary file in the MPEG video stream 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 ReadMPEGImage method is:
%
% Image *ReadMPEGImage(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 *ReadMPEGImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
#define ReadMPEGIntermediateFormat "pam"
Image
*image,
*images;
ImageInfo
*read_info;
MagickBooleanType
status;
/*
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);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == MagickFalse)
{
image=DestroyImageList(image);
return((Image *) NULL);
}
(void) CloseBlob(image);
(void) DestroyImageList(image);
/*
Convert MPEG to PAM with delegate.
*/
read_info=CloneImageInfo(image_info);
image=AcquireImage(image_info);
(void) InvokeDelegate(read_info,image,"mpeg:decode",(char *) NULL,exception);
image=DestroyImage(image);
(void) FormatLocaleString(read_info->filename,MaxTextExtent,"%s.%s",
read_info->unique,ReadMPEGIntermediateFormat);
images=ReadImage(read_info,exception);
(void) RelinquishUniqueFileResource(read_info->filename);
read_info=DestroyImageInfo(read_info);
return(images);
}
/*
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% R e g i s t e r M P E G I m a g e %
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% RegisterMPEGImage() adds attributes for the MPEG 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 RegisterMPEGImage method is:
%
% size_t RegisterMPEGImage(void)
%
*/
ModuleExport size_t RegisterMPEGImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("AVI");
entry->decoder=(DecodeImageHandler *) ReadMPEGImage;
entry->magick=(IsImageFormatHandler *) IsAVI;
entry->blob_support=MagickFalse;
entry->description=ConstantString("Microsoft Audio/Visual Interleaved");
entry->module=ConstantString("MPEG");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("MKV");
entry->decoder=(DecodeImageHandler *) ReadMPEGImage;
entry->encoder=(EncodeImageHandler *) WriteMPEGImage;
entry->magick=(IsImageFormatHandler *) IsMPEG;
entry->blob_support=MagickFalse;
entry->description=ConstantString("Multimedia Container");
entry->module=ConstantString("MPEG");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("MOV");
entry->decoder=(DecodeImageHandler *) ReadMPEGImage;
entry->encoder=(EncodeImageHandler *) WriteMPEGImage;
entry->magick=(IsImageFormatHandler *) IsMPEG;
entry->blob_support=MagickFalse;
entry->description=ConstantString("MPEG Video Stream");
entry->module=ConstantString("MPEG");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("MPEG");
entry->decoder=(DecodeImageHandler *) ReadMPEGImage;
entry->encoder=(EncodeImageHandler *) WriteMPEGImage;
entry->magick=(IsImageFormatHandler *) IsMPEG;
entry->blob_support=MagickFalse;
entry->description=ConstantString("MPEG Video Stream");
entry->module=ConstantString("MPEG");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("MPG");
entry->decoder=(DecodeImageHandler *) ReadMPEGImage;
entry->encoder=(EncodeImageHandler *) WriteMPEGImage;
entry->magick=(IsImageFormatHandler *) IsMPEG;
entry->blob_support=MagickFalse;
entry->description=ConstantString("MPEG Video Stream");
entry->module=ConstantString("MPEG");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("MP4");
entry->decoder=(DecodeImageHandler *) ReadMPEGImage;
entry->encoder=(EncodeImageHandler *) WriteMPEGImage;
entry->magick=(IsImageFormatHandler *) IsMPEG;
entry->blob_support=MagickFalse;
entry->description=ConstantString("MPEG-4 Video Stream");
entry->module=ConstantString("MPEG");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("M2V");
entry->decoder=(DecodeImageHandler *) ReadMPEGImage;
entry->encoder=(EncodeImageHandler *) WriteMPEGImage;
entry->magick=(IsImageFormatHandler *) IsMPEG;
entry->blob_support=MagickFalse;
entry->description=ConstantString("MPEG Video Stream");
entry->module=ConstantString("MPEG");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("M4V");
entry->decoder=(DecodeImageHandler *) ReadMPEGImage;
entry->encoder=(EncodeImageHandler *) WriteMPEGImage;
entry->magick=(IsImageFormatHandler *) IsMPEG;
entry->blob_support=MagickFalse;
entry->description=ConstantString("Raw MPEG-4 Video");
entry->module=ConstantString("MPEG");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("WMV");
entry->decoder=(DecodeImageHandler *) ReadMPEGImage;
entry->encoder=(EncodeImageHandler *) WriteMPEGImage;
entry->magick=(IsImageFormatHandler *) IsMPEG;
entry->blob_support=MagickFalse;
entry->description=ConstantString("Windows Media Video");
entry->module=ConstantString("MPEG");
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
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% U n r e g i s t e r M P E G I m a g e %
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%
% UnregisterMPEGImage() removes format registrations made by the
% BIM module from the list of supported formats.
%
% The format of the UnregisterBIMImage method is:
%
% UnregisterMPEGImage(void)
%
*/
ModuleExport void UnregisterMPEGImage(void)
{
(void) UnregisterMagickInfo("WMV");
(void) UnregisterMagickInfo("MOV");
(void) UnregisterMagickInfo("M4V");
(void) UnregisterMagickInfo("M2V");
(void) UnregisterMagickInfo("MP4");
(void) UnregisterMagickInfo("MPG");
(void) UnregisterMagickInfo("MPEG");
(void) UnregisterMagickInfo("MKV");
(void) UnregisterMagickInfo("AVI");
}
/*
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% W r i t e M P E G I m a g e %
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%
% WriteMPEGImage() writes an image to a file in MPEG video stream format.
% Lawrence Livermore National Laboratory (LLNL) contributed code to adjust
% the MPEG parameters to correspond to the compression quality setting.
%
% The format of the WriteMPEGImage method is:
%
% MagickBooleanType WriteMPEGImage(const ImageInfo *image_info,
% Image *image)
%
% A description of each parameter follows.
%
% o image_info: the image info.
%
% o image: The image.
%
*/
static MagickBooleanType CopyDelegateFile(const char *source,
const char *destination)
{
int
destination_file,
source_file;
MagickBooleanType
status;
register size_t
i;
size_t
length,
quantum;
ssize_t
count;
struct stat
attributes;
unsigned char
*buffer;
/*
Return if destination file already exists and is not empty.
*/
assert(source != (const char *) NULL);
assert(destination != (char *) NULL);
status=GetPathAttributes(destination,&attributes);
if ((status != MagickFalse) && (attributes.st_size > 0))
return(MagickTrue);
/*
Copy source file to destination.
*/
destination_file=open_utf8(destination,O_WRONLY | O_BINARY | O_CREAT,S_MODE);
if (destination_file == -1)
return(MagickFalse);
source_file=open_utf8(source,O_RDONLY | O_BINARY,0);
if (source_file == -1)
{
(void) close(destination_file);
return(MagickFalse);
}
quantum=(size_t) MagickMaxBufferExtent;
if ((fstat(source_file,&attributes) == 0) && (attributes.st_size > 0))
quantum=(size_t) MagickMin((double) attributes.st_size,
MagickMaxBufferExtent);
buffer=(unsigned char *) AcquireQuantumMemory(quantum,sizeof(*buffer));
if (buffer == (unsigned char *) NULL)
{
(void) close(source_file);
(void) close(destination_file);
return(MagickFalse);
}
length=0;
for (i=0; ; i+=count)
{
count=(ssize_t) read(source_file,buffer,quantum);
if (count <= 0)
break;
length=(size_t) count;
count=(ssize_t) write(destination_file,buffer,length);
if ((size_t) count != length)
break;
}
(void) close(destination_file);
(void) close(source_file);
buffer=(unsigned char *) RelinquishMagickMemory(buffer);
return(i != 0 ? MagickTrue : MagickFalse);
}
static MagickBooleanType WriteMPEGImage(const ImageInfo *image_info,
Image *image)
{
#define WriteMPEGIntermediateFormat "jpg"
char
basename[MaxTextExtent],
filename[MaxTextExtent];
double
delay;
Image
*coalesce_image;
ImageInfo
*write_info;
int
file;
MagickBooleanType
status;
register Image
*p;
register ssize_t
i;
size_t
count,
length,
scene;
unsigned char
*blob;
/*
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);
status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
if (status == MagickFalse)
return(status);
(void) CloseBlob(image);
/*
Write intermediate files.
*/
coalesce_image=CoalesceImages(image,&image->exception);
if (coalesce_image == (Image *) NULL)
return(MagickFalse);
file=AcquireUniqueFileResource(basename);
if (file != -1)
file=close(file)-1;
(void) FormatLocaleString(coalesce_image->filename,MaxTextExtent,"%s",
basename);
count=0;
write_info=CloneImageInfo(image_info);
*write_info->magick='\0';
for (p=coalesce_image; p != (Image *) NULL; p=GetNextImageInList(p))
{
char
previous_image[MaxTextExtent];
blob=(unsigned char *) NULL;
length=0;
scene=p->scene;
delay=100.0*p->delay/MagickMax(1.0*p->ticks_per_second,1.0);
for (i=0; i < (ssize_t) MagickMax((1.0*delay+1.0)/3.0,1.0); i++)
{
p->scene=count;
count++;
status=MagickFalse;
switch (i)
{
case 0:
{
Image
*frame;
(void) FormatLocaleString(p->filename,MaxTextExtent,"%s%.20g.%s",
basename,(double) p->scene,WriteMPEGIntermediateFormat);
(void) FormatLocaleString(filename,MaxTextExtent,"%s%.20g.%s",
basename,(double) p->scene,WriteMPEGIntermediateFormat);
(void) FormatLocaleString(previous_image,MaxTextExtent,
"%s%.20g.%s",basename,(double) p->scene,
WriteMPEGIntermediateFormat);
frame=CloneImage(p,0,0,MagickTrue,&p->exception);
if (frame == (Image *) NULL)
break;
status=WriteImage(write_info,frame);
frame=DestroyImage(frame);
break;
}
case 1:
{
blob=(unsigned char *) FileToBlob(previous_image,~0UL,&length,
&image->exception);
}
default:
{
(void) FormatLocaleString(filename,MaxTextExtent,"%s%.20g.%s",
basename,(double) p->scene,WriteMPEGIntermediateFormat);
if (length > 0)
status=BlobToFile(filename,blob,length,&image->exception);
break;
}
}
if (image->debug != MagickFalse)
{
if (status != MagickFalse)
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
"%.20g. Wrote %s file for scene %.20g:",(double) i,
WriteMPEGIntermediateFormat,(double) p->scene);
else
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
"%.20g. Failed to write %s file for scene %.20g:",(double) i,
WriteMPEGIntermediateFormat,(double) p->scene);
(void) LogMagickEvent(CoderEvent,GetMagickModule(),"%s",filename);
}
}
p->scene=scene;
if (blob != (unsigned char *) NULL)
blob=(unsigned char *) RelinquishMagickMemory(blob);
if (status == MagickFalse)
break;
}
/*
Convert JPEG to MPEG.
*/
(void) CopyMagickString(coalesce_image->magick_filename,basename,
MaxTextExtent);
(void) CopyMagickString(coalesce_image->filename,basename,MaxTextExtent);
GetPathComponent(image_info->filename,ExtensionPath,coalesce_image->magick);
if (*coalesce_image->magick == '\0')
(void) CopyMagickString(coalesce_image->magick,image->magick,MaxTextExtent);
status=InvokeDelegate(write_info,coalesce_image,(char *) NULL,"mpeg:encode",
&image->exception);
(void) FormatLocaleString(write_info->filename,MaxTextExtent,"%s.%s",
write_info->unique,coalesce_image->magick);
status=CopyDelegateFile(write_info->filename,image->filename);
(void) RelinquishUniqueFileResource(write_info->filename);
write_info=DestroyImageInfo(write_info);
/*
Relinquish resources.
*/
count=0;
for (p=coalesce_image; p != (Image *) NULL; p=GetNextImageInList(p))
{
delay=100.0*p->delay/MagickMax(1.0*p->ticks_per_second,1.0);
for (i=0; i < (ssize_t) MagickMax((1.0*delay+1.0)/3.0,1.0); i++)
{
(void) FormatLocaleString(p->filename,MaxTextExtent,"%s%.20g.%s",
basename,(double) count++,WriteMPEGIntermediateFormat);
(void) RelinquishUniqueFileResource(p->filename);
}
(void) CopyMagickString(p->filename,image_info->filename,MaxTextExtent);
}
(void) RelinquishUniqueFileResource(basename);
coalesce_image=DestroyImageList(coalesce_image);
if (image->debug != MagickFalse)
(void) LogMagickEvent(CoderEvent,GetMagickModule(),"exit");
return(status);
}