/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- DecodeImage
- IsAVI
- ReadAVIImage
- RegisterAVIImage
- UnregisterAVIImage
/*
% Copyright (C) 2003 GraphicsMagick Group
% Copyright (C) 2002 ImageMagick Studio
%
% This program is covered by multiple licenses, which are described in
% Copyright.txt. You should have received a copy of Copyright.txt with this
% package; otherwise see http://www.graphicsmagick.org/www/Copyright.html.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% AAA V V IIIII %
% A A V V I %
% AAAAA V V I %
% A A V V I %
% A A V IIIII %
% %
% %
% Read Microsoft Audio/Visual Interleaved Image Format. %
% %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/colormap.h"
#include "magick/magick.h"
#include "magick/monitor.h"
#include "magick/pixel_cache.h"
#include "magick/utility.h"
/*
Typedef declaractions.
*/
typedef struct _AVIInfo
{
unsigned long
delay,
max_data_rate,
pad_granularity,
flags,
total_frames,
initial_frames,
number_streams,
buffer_size,
width,
height,
time_scale,
data_rate,
start_time,
data_length;
} AVIInfo;
typedef struct _BMPInfo
{
unsigned long
size,
width,
height,
planes,
bits_per_pixel;
char
compression[5];
unsigned long
image_size,
x_pixels,
y_pixels,
number_colors,
important_colors;
} BMPInfo;
typedef struct _StreamInfo
{
char
data_type[5],
data_handler[5];
unsigned long
flags,
priority,
initial_frames,
time_scale,
data_rate,
start_time,
data_length,
buffer_size,
quality,
sample_size;
} StreamInfo;
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% D e c o d e I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method DecodeImage unpacks the packed image pixels into runlength-encoded
% pixel packets.
%
% The format of the DecodeImage method is:
%
% unsigned int DecodeImage(Image *image,const unsigned int compression,
% unsigned char *pixels)
%
% A description of each parameter follows:
%
% o status: Method DecodeImage returns True if all the pixels are
% uncompressed without error, otherwise False.
%
% o image: The address of a structure of type Image.
%
% o compression: A value of 1 means the compressed pixels are runlength
% encoded for a 256-color bitmap. A value of 2 means a 16-color bitmap.
%
% o pixels: The address of a byte (8 bits) array of pixel data created by
% the decoding process.
%
%
*/
static MagickPassFail DecodeImage(Image *image,const unsigned int compression,
unsigned char *pixels)
{
int
byte,
count;
long
y;
register long
i,
x;
register unsigned char
*q;
unsigned char
*end;
(void) memset(pixels,0,image->columns*image->rows);
byte=0;
x=0;
q=pixels;
end=pixels + (size_t) image->columns*image->rows;
for (y=0; y < (long) image->rows; )
{
if (q < pixels || q >= end)
break;
if ((count=ReadBlobByte(image)) == EOF)
goto unexpected_eof;
if (count != 0)
{
count=Min(count, end - q);
/*
Encoded mode.
*/
if ((byte=ReadBlobByte(image)) == EOF)
goto unexpected_eof;
for (i=0; i < count; i++)
{
if (compression == 1)
*q++=(unsigned char) byte;
else
*q++=(unsigned char)
((i & 0x01) ? (byte & 0x0f) : ((byte >> 4) & 0x0f));
x++;
}
}
else
{
/*
Escape mode.
*/
if ((count=ReadBlobByte(image)) == EOF)
goto unexpected_eof;
if (count == 0x01)
return(MagickPass);
switch (count)
{
case 0x00:
{
/*
End of line.
*/
x=0;
y++;
q=pixels+y*image->columns;
break;
}
case 0x02:
{
/*
Delta mode.
*/
if ((byte=ReadBlobByte(image)) == EOF)
goto unexpected_eof;
x+=byte;
if ((byte=ReadBlobByte(image)) == EOF)
goto unexpected_eof;
y+=byte;
if ((x >= (long) image->columns) || (y >= (long) image->rows))
{
ThrowException(&image->exception,CorruptImageError,CorruptImage,NULL);
return MagickFail;
}
q=pixels+y*image->columns+x;
break;
}
default:
{
/*
Absolute mode.
*/
count=Min(count, end - q);
for (i=0; i < count; i++)
{
if (compression == 1)
{
if ((byte=ReadBlobByte(image)) == EOF)
goto unexpected_eof;
*q++=byte;
}
else
{
if ((i & 0x01) == 0)
{
if ((byte=ReadBlobByte(image)) == EOF)
goto unexpected_eof;
}
*q++=(unsigned char)
((i & 0x01) ? (byte & 0x0f) : ((byte >> 4) & 0x0f));
}
x++;
}
/*
Read pad byte.
*/
if (compression == 1)
{
if (count & 0x01)
{
if (ReadBlobByte(image) == EOF)
goto unexpected_eof;
}
}
else
if (((count & 0x03) == 1) || ((count & 0x03) == 2))
{
if (ReadBlobByte(image) == EOF)
goto unexpected_eof;
}
break;
}
}
}
if (QuantumTick(y,image->rows))
if (!MagickMonitorFormatted(y,image->rows,&image->exception,
LoadImageText,image->filename,
image->columns,image->rows))
break;
}
if (ReadBlobByte(image) == EOF) /* end of line */
goto unexpected_eof;
if (ReadBlobByte(image) == EOF)
goto unexpected_eof;
return(MagickPass);
unexpected_eof:
ThrowException(&image->exception,CorruptImageError,UnexpectedEndOfFile,NULL);
return MagickFail;
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% I s A V I %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method IsAVI returns True if the image format type, identified by the
% magick string, is Audio/Video Interleaved file format.
%
% The format of the IsAVI method is:
%
% unsigned long IsAVI(const unsigned char *magick,const size_t length)
%
% A description of each parameter follows:
%
% o status: Method IsAVI returns True if the image format type is AVI.
%
% o magick: This string is generally the first few bytes of an image file
% or blob.
%
% o length: Specifies the length of the magick string.
%
%
*/
static unsigned int IsAVI(const unsigned char *magick,const size_t length)
{
if (length < 4)
return(False);
if (memcmp(magick,"RIFF",4) == 0)
return(True);
return(False);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d A V I I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ReadAVIImage reads an Audio Video Interleave image file 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 ReadAVIImage method is:
%
% Image *ReadAVIImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadAVIImage returns a pointer to the image after
% reading. A null image is returned if there is a memory shortage or if
% the image cannot be read.
%
% o image_info: Specifies a pointer to a ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
static Image *ReadAVIImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
AVIInfo
avi_info;
BMPInfo
bmp_info;
char
id[MaxTextExtent],
message[MaxTextExtent];
Image
*image;
IndexPacket
index;
long
bit,
y;
PixelPacket
*colormap;
register IndexPacket
*indexes;
register long
x;
register PixelPacket
*q;
register long
i;
register unsigned char
*p;
StreamInfo
stream_info;
unsigned char
*pixels;
unsigned int
status;
unsigned long
bytes_per_line,
chunk_size,
count,
number_colors;
MagickBool
first_chunk;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AllocateImage(image_info);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == False)
ThrowReaderException(FileOpenError,UnableToOpenFile,image);
(void) memset(&avi_info,0,sizeof(AVIInfo));
(void) memset(&bmp_info,0,sizeof(BMPInfo));
colormap=(PixelPacket *) NULL;
number_colors=0;
first_chunk=MagickTrue;
for ( ; ; )
{
count=ReadBlob(image,4,id);
if (count != 4)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
id[4]='\0';
if (first_chunk)
{
if (memcmp(id,"RIFF",4) != 0)
ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
first_chunk=MagickFalse;
}
chunk_size=ReadBlobLSBLong(image);
if (EOFBlob(image))
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
if (chunk_size == 0)
break;
if (chunk_size & 0x01)
chunk_size++;
if (image_info->verbose)
{
(void) fprintf(stdout,"AVI cid %.1024s\n",id);
(void) fprintf(stdout," chunk size %lu\n",chunk_size);
}
if ((LocaleCompare(id,"00db") == 0) || (LocaleCompare(id,"00dc") == 0))
{
if (LocaleCompare(bmp_info.compression,"MJPG") == 0)
{
FormatString(message,"AVI compression %.1024s not yet supported",
bmp_info.compression);
ThrowException2(exception,CorruptImageError,message,image->filename);
for ( ; chunk_size != 0; chunk_size--)
if (ReadBlobByte(image) == EOF)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
continue;
}
/*
Initialize image structure.
*/
image->columns=avi_info.width;
image->rows=avi_info.height;
image->depth=8;
image->units=PixelsPerCentimeterResolution;
image->x_resolution=bmp_info.x_pixels/100.0;
image->y_resolution=bmp_info.y_pixels/100.0;
if (!AllocateImageColormap(image,number_colors ? number_colors : 256))
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,
image);
if (number_colors != 0)
(void) memcpy(image->colormap,colormap,
number_colors*sizeof(PixelPacket));
if (image_info->ping && (image_info->subrange != 0))
if (image->scene >= (image_info->subimage+image_info->subrange-1))
break;
bytes_per_line=4*((image->columns*bmp_info.bits_per_pixel+31)/32);
pixels=MagickAllocateMemory(unsigned char *,
Max(bytes_per_line,image->columns+1)*image->rows);
if (pixels == (unsigned char *) NULL)
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,
image);
if (LocaleCompare(id,"00db") == 0)
{
size_t
size;
size=bytes_per_line*image->rows;
if (ReadBlob(image,bytes_per_line*image->rows,(char *) pixels) != size)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
}
else
{
status=DecodeImage(image,1,pixels);
if (status == MagickFail)
ThrowReaderException(CorruptImageError,UnableToRunlengthDecodeImage,image);
}
/*
Convert BMP raster image to pixel packets.
*/
switch ((int) bmp_info.bits_per_pixel)
{
case 1:
{
/*
Convert bitmap scanline.
*/
for (y=(long) image->rows-1; y >= 0; y--)
{
p=pixels+(image->rows-y-1)*bytes_per_line;
q=SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
indexes=AccessMutableIndexes(image);
for (x=0; x < ((long) image->columns-7); x+=8)
{
for (bit=0; bit < 8; bit++)
{
index=((*p) & (0x80 >> bit) ? 0x01 : 0x00);
indexes[x+bit]=index;
*q++=image->colormap[index];
}
p++;
}
if ((image->columns % 8) != 0)
{
for (bit=0; bit < (long) (image->columns % 8); bit++)
{
index=((*p) & (0x80 >> bit) ? 0x01 : 0x00);
indexes[x+bit]=index;
*q++=image->colormap[index];
}
p++;
}
if (!SyncImagePixels(image))
break;
if (image->previous == (Image *) NULL)
if (QuantumTick(y,image->rows))
{
status=MagickMonitorFormatted(image->rows-y-1,
image->rows,exception,
LoadImageText,image->filename,
image->columns,image->rows);
if (status == False)
break;
}
}
break;
}
case 4:
{
/*
Convert PseudoColor scanline.
*/
for (y=(long) image->rows-1; y >= 0; y--)
{
p=pixels+(image->rows-y-1)*bytes_per_line;
q=SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
indexes=AccessMutableIndexes(image);
for (x=0; x < ((long) image->columns-1); x+=2)
{
index=(IndexPacket) ((*p >> 4) & 0xf);
VerifyColormapIndex(image,index);
indexes[x]=index;
*q++=image->colormap[index];
index=(IndexPacket) (*p & 0xf);
VerifyColormapIndex(image,index);
indexes[x+1]=index;
*q++=image->colormap[index];
p++;
}
if ((image->columns % 2) != 0)
{
index=(IndexPacket) ((*p >> 4) & 0xf);
VerifyColormapIndex(image,index);
indexes[x]=index;
*q++=image->colormap[index];
p++;
}
if (!SyncImagePixels(image))
break;
if (image->previous == (Image *) NULL)
if (QuantumTick(y,image->rows))
{
status=MagickMonitorFormatted(image->rows-y-1,
image->rows,exception,
LoadImageText,image->filename,
image->columns,image->rows);
if (status == False)
break;
}
}
break;
}
case 8:
{
/*
Convert PseudoColor scanline.
*/
bytes_per_line=image->columns;
for (y=(long) image->rows-1; y >= 0; y--)
{
p=pixels+(image->rows-y-1)*bytes_per_line;
q=SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
indexes=AccessMutableIndexes(image);
for (x=0; x < (long) image->columns; x++)
{
index=(IndexPacket) (*p);
VerifyColormapIndex(image,index);
indexes[x]=index;
*q=image->colormap[index];
p++;
q++;
}
if (!SyncImagePixels(image))
break;
if (image->previous == (Image *) NULL)
if (QuantumTick(y,image->rows))
{
status=MagickMonitorFormatted(image->rows-y-1,
image->rows,exception,
LoadImageText,image->filename,
image->columns,image->rows);
if (status == False)
break;
}
}
break;
}
case 16:
{
unsigned short
word;
/*
Convert PseudoColor scanline.
*/
bytes_per_line=image->columns << 1;
image->storage_class=DirectClass;
for (y=(long) image->rows-1; y >= 0; y--)
{
p=pixels+(image->rows-y-1)*bytes_per_line;
q=SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
for (x=0; x < (long) image->columns; x++)
{
word=(*p++);
word|=(*p++ << 8);
q->red=ScaleCharToQuantum(ScaleColor5to8((word >> 11) & 0x1f));
q->green=ScaleCharToQuantum(ScaleColor6to8((word >> 5) & 0x3f));
q->blue=ScaleCharToQuantum(ScaleColor5to8(word & 0x1f));
q++;
}
if (!SyncImagePixels(image))
break;
if (image->previous == (Image *) NULL)
if (QuantumTick(y,image->rows))
{
status=MagickMonitorFormatted(image->rows-y-1,
image->rows,exception,
LoadImageText,image->filename,
image->columns,image->rows);
if (status == False)
break;
}
}
break;
}
case 24:
case 32:
{
/*
Convert DirectColor scanline.
*/
image->storage_class=DirectClass;
for (y=(long) image->rows-1; y >= 0; y--)
{
p=pixels+(image->rows-y-1)*bytes_per_line;
q=SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
for (x=0; x < (long) image->columns; x++)
{
q->blue=ScaleCharToQuantum(*p++);
q->green=ScaleCharToQuantum(*p++);
q->red=ScaleCharToQuantum(*p++);
if (image->matte)
q->opacity=ScaleCharToQuantum(*p++);
q++;
}
if (!SyncImagePixels(image))
break;
if (image->previous == (Image *) NULL)
if (QuantumTick(y,image->rows))
{
status=MagickMonitorFormatted(image->rows-y-1,
image->rows,exception,
LoadImageText,image->filename,
image->columns,image->rows);
if (status == False)
break;
}
}
break;
}
default:
ThrowReaderException(CorruptImageError,ImproperImageHeader,image)
}
MagickFreeMemory(pixels);
if ((unsigned long) image->scene < (avi_info.total_frames-1))
{
/*
Allocate next image structure.
*/
AllocateNextImage(image_info,image);
if (image->next == (Image *) NULL)
{
DestroyImageList(image);
return((Image *) NULL);
}
image=SyncNextImageInList(image);
status=MagickMonitorFormatted(TellBlob(image),
GetBlobSize(image),exception,
LoadImagesText,image->filename);
if (status == False)
break;
}
continue;
}
if (LocaleCompare(id,"avih") == 0)
{
/*
AVI header.
*/
if (image_info->verbose)
(void) fprintf(stdout," AVI header\n");
avi_info.delay=ReadBlobLSBLong(image);
avi_info.max_data_rate=ReadBlobLSBLong(image);
avi_info.pad_granularity=ReadBlobLSBLong(image);
avi_info.flags=ReadBlobLSBLong(image);
avi_info.total_frames=ReadBlobLSBLong(image);
avi_info.initial_frames=ReadBlobLSBLong(image);
avi_info.number_streams=ReadBlobLSBLong(image);
avi_info.buffer_size=ReadBlobLSBLong(image);
avi_info.width=ReadBlobLSBLong(image);
avi_info.height=ReadBlobLSBLong(image);
avi_info.time_scale=ReadBlobLSBLong(image);
avi_info.data_rate=ReadBlobLSBLong(image);
avi_info.start_time=ReadBlobLSBLong(image);
avi_info.data_length=ReadBlobLSBLong(image);
if (EOFBlob(image))
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
continue;
}
if (LocaleCompare(id,"idx1") == 0)
{
for ( ; chunk_size != 0; chunk_size--)
if (ReadBlobByte(image) == EOF)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
continue;
}
if (LocaleCompare(id,"JUNK") == 0)
{
for ( ; chunk_size != 0; chunk_size--)
if (ReadBlobByte(image) == EOF)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
continue;
}
if (LocaleCompare(id,"LIST") == 0)
{
/*
List of chunks.
*/
if (ReadBlob(image,4,id) != 4)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
if (image_info->verbose)
(void) fprintf(stdout," List type %.1024s\n",id);
continue;
}
if (LocaleCompare(id,"RIFF") == 0)
{
/*
File header.
*/
if (ReadBlob(image,4,id) != 4)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
if (image_info->verbose)
(void) fprintf(stdout," RIFF form type %.1024s\n",id);
continue;
}
if (LocaleCompare(id,"strf") == 0)
{
/*
Stream format.
*/
if (image_info->verbose)
(void) fprintf(stdout," Stream fcc\n");
if (LocaleCompare(stream_info.data_type,"vids") == 0)
{
bmp_info.size=ReadBlobLSBLong(image);
bmp_info.width=ReadBlobLSBLong(image);
bmp_info.height=ReadBlobLSBLong(image);
bmp_info.planes=ReadBlobLSBShort(image);
bmp_info.bits_per_pixel=ReadBlobLSBShort(image);
if (ReadBlob(image,4,bmp_info.compression) != 4)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
bmp_info.compression[4]='\0';
bmp_info.image_size=ReadBlobLSBLong(image);
bmp_info.x_pixels=ReadBlobLSBLong(image);
bmp_info.y_pixels=ReadBlobLSBLong(image);
bmp_info.number_colors=ReadBlobLSBLong(image);
bmp_info.important_colors=ReadBlobLSBLong(image);
if (EOFBlob(image))
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
chunk_size-=40;
number_colors=bmp_info.number_colors;
if ((number_colors == 0) && (bmp_info.bits_per_pixel <= 8))
number_colors=1 << bmp_info.bits_per_pixel;
if (number_colors != 0)
{
colormap=MagickAllocateMemory(PixelPacket *,
number_colors*sizeof(PixelPacket));
if (colormap == (PixelPacket *) NULL)
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);
for (i=0; i < (long) number_colors; i++)
{
colormap[i].blue=ScaleCharToQuantum(ReadBlobByte(image));
colormap[i].green=ScaleCharToQuantum(ReadBlobByte(image));
colormap[i].red=ScaleCharToQuantum(ReadBlobByte(image));
if (ReadBlobByte(image) == EOF)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
chunk_size-=4;
}
}
for ( ; chunk_size != 0; chunk_size--)
if (ReadBlobByte(image) == EOF)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
if (image_info->verbose)
(void) fprintf(stdout,"Video compression: %.1024s\n",
bmp_info.compression);
continue;
}
for ( ; chunk_size != 0; chunk_size--)
if (ReadBlobByte(image) == EOF)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
continue;
}
if (LocaleCompare(id,"strh") == 0)
{
if (image_info->verbose)
(void) fprintf(stdout," Stream header\n");
if (ReadBlob(image,4,stream_info.data_type) != 4)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
stream_info.data_type[4]='\0';
if (ReadBlob(image,4,stream_info.data_handler) != 4)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
stream_info.data_handler[4]='\0';
stream_info.flags=ReadBlobLSBLong(image);
stream_info.priority=ReadBlobLSBLong(image);
stream_info.initial_frames=ReadBlobLSBLong(image);
stream_info.time_scale=ReadBlobLSBLong(image);
stream_info.data_rate=ReadBlobLSBLong(image);
stream_info.start_time=ReadBlobLSBLong(image);
stream_info.data_length=ReadBlobLSBLong(image);
stream_info.buffer_size=ReadBlobLSBLong(image);
stream_info.quality=ReadBlobLSBLong(image);
stream_info.sample_size=ReadBlobLSBLong(image);
if (EOFBlob(image))
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
if (chunk_size & 0x01)
chunk_size++;
for (chunk_size-=48; chunk_size != 0; chunk_size--)
if (ReadBlobByte(image) == EOF)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
if (image_info->verbose)
(void) fprintf(stdout,"AVI Test handler: %.1024s\n",
stream_info.data_handler);
continue;
}
if (LocaleCompare(id,"strn") == 0)
{
for ( ; chunk_size != 0; chunk_size--)
if (ReadBlobByte(image) == EOF)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
continue;
}
if (LocaleCompare(id,"vedt") == 0)
{
for ( ; chunk_size != 0; chunk_size--)
if (ReadBlobByte(image) == EOF)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
continue;
}
FormatString(message,"AVI chunk %.1024s not yet supported",id);
ThrowException2(exception,CorruptImageError,message,image->filename);
for ( ; chunk_size != 0; chunk_size--)
if (ReadBlobByte(image) == EOF)
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
continue;
}
while (image->previous != (Image *) NULL)
image=image->previous;
CloseBlob(image);
if ((image->columns == 0) || (image->rows == 0))
{
DestroyImageList(image);
return((Image *) NULL);
}
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r A V I I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method RegisterAVIImage adds attributes for the AVI 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 RegisterAVIImage method is:
%
% RegisterAVIImage(void)
%
*/
ModuleExport void RegisterAVIImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("AVI");
entry->decoder=(DecoderHandler) ReadAVIImage;
entry->magick=(MagickHandler) IsAVI;
entry->description="Microsoft Audio/Visual Interleaved";
entry->module="AVI";
entry->coder_class=UnstableCoderClass;
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r A V I I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterAVIImage removes format registrations made by the
% AVI module from the list of supported formats.
%
% The format of the UnregisterAVIImage method is:
%
% UnregisterAVIImage(void)
%
*/
ModuleExport void UnregisterAVIImage(void)
{
(void) UnregisterMagickInfo("AVI");
}