Program JpegTran;
{ This file contains a command-line user interface for JPEG transcoding.
It is very similar to cjpeg.c, but provides lossless transcoding between
different JPEG file formats. }
{ Original: jpegtran.c ; Copyright (C) 1995-1996, Thomas G. Lane. }
{$define TWO_FILE_COMMANDLINE}
{$I jconfig.inc}
uses
jdeferr,
jerror,
jmorecfg,
jpeglib,
cdjpeg, { Common decls for cjpeg/djpeg applications }
jdatasrc, JDatadst, transupp, JCTrans, JDtrans,
JdAPImin, JcAPImin, JcParam,
RdSwitch;
{ Argument-parsing code.
The switch parser is designed to be useful with DOS-style command line
syntax, ie, intermixed switches and file names, where only the switches
to the left of a given file name affect processing of that file.
The main program in this file doesn't actually use this capability... }
var
progname, { program name for error messages }
outfilename : string; { for -outfile switch }
copyoption : JCOPY_OPTION; { -copy switch }
transformoption : jpeg_transform_info; { image transformation options }
procedure Stop(errcode : int);
begin
Halt(errcode);
end;
{LOCAL}
procedure usage;
{ complain about bad command line }
begin
Write(output, 'usage: ',progname,' [switches] ');
{$ifdef TWO_FILE_COMMANDLINE}
WriteLn(output, 'inputfile outputfile');
{$else}
WriteLn(output, '[inputfile]');
{$endif}
WriteLn(output, 'Switches (names may be abbreviated):');
WriteLn(' -copy none Copy no extra markers from source file');
WriteLn(' -copy comments Copy only comment markers (default)');
WriteLn(' -copy all Copy all extra markers');
{$ifdef ENTROPY_OPT_SUPPORTED}
WriteLn(' -optimize Optimize Huffman table (smaller file, but slow compression)');
{$endif}
{$ifdef C_PROGRESSIVE_SUPPORTED}
WriteLn(' -progressive Create progressive JPEG file');
{$endif}
{$ifdef TRANSFORMS_SUPPORTED}
WriteLn('Switches for modifying the image:');
WriteLn(' -grayscale Reduce to grayscale (omit color data)');
WriteLn(' -flip [horizontal|vertical] Mirror image (left-right or top-bottom)');
WriteLn(' -rotate [90|180|270] Rotate image (degrees clockwise)');
WriteLn(' -transpose Transpose image');
WriteLn(' -transverse Transverse transpose image');
WriteLn(' -trim Drop non-transformable edge blocks');
{$ifdef CROP_SUPPORTED}
WriteLn(' -cut WxH+X+Y Cut out a subset of the image');
{$endif}
{$endif} { TRANSFORMS_SUPPORTED }
WriteLn('Switches for advanced users:');
WriteLn(' -restart N Set restart interval in rows, or in blocks with B');
WriteLn(' -maxmemory N Maximum memory to use (in kbytes)');
WriteLn(' -outfile name Specify name for output file');
WriteLn(' -verbose or -debug Emit debug output');
WriteLn('Switches for wizards:');
{$ifdef C_ARITH_CODING_SUPPORTED}
WriteLn(' -arithmetic Use arithmetic coding');
{$endif}
{$ifdef C_MULTISCAN_FILES_SUPPORTED}
WriteLn(' -scans file Create multi-scan JPEG per script file');
{$endif}
Stop(EXIT_FAILURE);
end;
{LOCAL}
procedure select_transform (transform : JXFORM_CODE);
{ Silly little routine to detect multiple transform options,
which we can't handle. }
begin
{$ifdef TRANSFORMS_SUPPORTED}
if (transformoption.transform = JXFORM_NONE) or
(transformoption.transform = transform) then
transformoption.transform := transform
else
begin
WriteLn(progname, ': can only do one image transformation at a time');
usage;
end;
{$else}
WriteLn(progname, ': sorry, image transformation was not compiled');
exit(EXIT_FAILURE);
{$endif}
end;
{LOCAL}
function parse_switches (cinfo : j_compress_ptr;
last_file_arg_seen: int;
for_real : boolean ) : int;
const
printed_version : boolean = FALSE;
{ Parse optional switches.
Returns argv[] index of first file-name argument (= argc if none).
Any file names with indexes <= last_file_arg_seen are ignored;
they have presumably been processed in a previous iteration.
(Pass 0 for last_file_arg_seen on the first or only iteration.)
for_real is FALSE on the first (dummy) pass; we may skip any expensive
processing. }
var
argn,
argc : int;
arg : string;
simple_progressive : boolean;
const
scansarg : string = ''; { saves -scans parm if any }
var
lval : long;
ch : char;
code : integer;
begin
{ Set up default JPEG parameters. }
simple_progressive := FALSE;
outfilename := '';
cinfo^.err^.trace_level := 0;
copyoption := JCOPYOPT_DEFAULT;
transformoption.transform := JXFORM_NONE;
transformoption.trim := FALSE;
transformoption.force_grayscale := FALSE;
cinfo^.err^.trace_level := 0;
{ Scan command line options, adjust parameters }
argn := 0;
argc := ParamCount;
while argn < argc do
begin
Inc(argn);
arg := ParamStr(argn);
if (arg[1] <> '-') then
begin
{ Not a switch, must be a file name argument }
if (argn <= last_file_arg_seen) then
begin
outfilename := ''; { -outfile applies to just one input file }
continue; { ignore this name if previously processed }
end;
break; { else done parsing switches }
end;
{Inc(arg); - advance past switch marker character }
if (keymatch(arg, '-arithmetic', 1)) then
begin
{ Use arithmetic coding. }
{$ifdef C_ARITH_CODING_SUPPORTED}
cinfo^.arith_code := TRUE;
{$else}
WriteLn(output, progname, ': sorry, arithmetic coding not supported');
Stop(EXIT_FAILURE);
{$endif}
end
else
if keymatch(arg, '-copy', 2) then
begin { Select which extra markers to copy. }
Inc(argn);
if (argn >= argc) then { advance to next argument }
usage;
if (keymatch(ParamStr(argn), 'none', 1)) then
copyoption := JCOPYOPT_NONE
else
if (keymatch(ParamStr(argn), 'comments', 1)) then
copyoption := JCOPYOPT_COMMENTS
else
if (keymatch(ParamStr(argn), 'all', 1)) then
copyoption := JCOPYOPT_ALL
else
usage;
end
else
if keymatch(arg, '-debug', 2) or keymatch(arg, '-verbose', 2) then
begin
{ Enable debug printouts. }
{ On first -d, print version identification }
if (not printed_version) then
begin
WriteLn('PASJPEG Group''s JPEGTRAN translation version ',
JVERSION, JCOPYRIGHT, JNOTICE);
printed_version := TRUE;
end;
Inc(cinfo^.err^.trace_level);
end
else
{$ifdef CROP_SUPPORTED}
if keymatch(arg, '-cut', 2) then
begin
{ Cut out a region of the image specified by an X geometry-like string }
p : PChar;
Inc(argn);
if (argn >= argc) then
usage;
select_transform(JXFORM_CUT);
arg := ParamStr(argn);
px := Pos('x', arg);
if ( px = 'x') then
usage;
arg_w := Copy(arg, 1, px-1);
Val(arg_w, lval, code);
if (code <> 0) then
usage;
transformoption.newwidth := lval;
arg_w := Copy(arg, px+1, Length(arg));
Val(arg_w, lval, code);
if (code <> 0) then
usage;
transformoption.newheight := lval;
if (p^ <> '+') and (p^ <> '-') then
usage;
arg_w := Copy(arg, px+1, Length(arg));
Val(arg_w, lval, code);
if (code <> 0) then
usage;
transformoption.xoffs := lval;
arg_w := Copy(arg, px+1, Length(arg));
Val(arg_w, lval, code);
if (code <> 0) then
usage;
if (p^ <> '+') and (p^ <> '-') then
usage;
transformoption.yoffs := lval;
if (transformoption.newwidth=0) or (transformoption.newheight=0) then
begin
WriteLn(progname,': degenerate -cut size in ', argv[argn]);
exit(EXIT_FAILURE);
end
end
else
{$endif}
if keymatch(arg, '-flip', 2) then
begin { Mirror left-right or top-bottom. }
Inc(argn);
if (argn >= argc) then { advance to next argument }
usage;
if keymatch(ParamStr(argn), 'horizontal', 2) then
select_transform(JXFORM_FLIP_H)
else
if keymatch(ParamStr(argn), 'vertical', 2) then
select_transform(JXFORM_FLIP_V)
else
usage;
end
else
if keymatch(arg, '-grayscale', 2) or
keymatch(arg, '-greyscale',2) then
begin { Force to grayscale. }
{$ifdef TRANSFORMS_SUPPORTED}
transformoption.force_grayscale := TRUE;
{$else}
select_transform(JXFORM_NONE); { force an error }
{$endif}
end
else
if keymatch(arg, '-maxmemory', 4) then
begin
{ Maximum memory in Kb (or Mb with 'm'). }
ch := 'x';
Inc(argn);
if (argn >= argc) then { advance to next argument }
usage;
arg := ParamStr(argn);
if (length(arg) > 1) and (arg[length(arg)] in ['m','M']) then
begin
ch := arg[length(arg)];
arg := Copy(arg, 1, Length(arg)-1);
end;
Val(arg, lval, code);
if (code <> 0) then
usage;
if (ch = 'm') or (ch = 'M') then
lval := lval * long(1000);
cinfo^.mem^.max_memory_to_use := lval * long(1000);
end
else
if keymatch(arg, '-optimize', 2) or
keymatch(arg, '-optimise', 2) then
begin
{ Enable entropy parm optimization. }
{$ifdef ENTROPY_OPT_SUPPORTED}
cinfo^.optimize_coding := TRUE;
{$else}
WriteLn(output, progname,
': sorry, entropy optimization was not compiled');
Stop(EXIT_FAILURE);
{$endif}
end
else
if keymatch(arg, '-outfile', 5) then
begin
{ Set output file name. }
Inc(argn);
if (argn >= argc) then { advance to next argument }
usage;
outfilename := ParamStr(argn); { save it away for later use }
end
else
if keymatch(arg, '-progressive', 2) then
begin
{ Select simple progressive mode. }
{$ifdef C_PROGRESSIVE_SUPPORTED}
simple_progressive := TRUE;
{ We must postpone execution until num_components is known. }
{$else}
WriteLn(output, progname,
': sorry, progressive output was not compiled');
Stop(EXIT_FAILURE);
{$endif}
end
else
if keymatch(arg, '-restart', 2) then
begin
ch := 'x';
{ Restart interval in MCU rows (or in MCUs with 'b'). }
Inc(argn);
if (argn >= argc) then { advance to next argument }
usage;
arg := ParamStr(argn);
if (length(arg) > 1) and (arg[length(arg)] in ['b','B']) then
begin
ch := arg[length(arg)];
arg := Copy(arg, 1, Length(arg)-1);
end;
Val(arg, lval, code);
if (code <> 1) or (lval < 0) or (lval > Long(65535)) then
usage;
if (ch = 'b') or (ch = 'B') then
begin
cinfo^.restart_interval := uint(lval);
cinfo^.restart_in_rows := 0; { else prior '-restart n' overrides me }
end
else
begin
cinfo^.restart_in_rows := int(lval);
{ restart_interval will be computed during startup }
end;
end
else
if keymatch(arg, '-rotate', 3) then
begin { Rotate 90, 180, or 270 degrees (measured clockwise). }
Inc(argn);
if (argn >= argc) then { advance to next argument }
usage;
if (keymatch(ParamStr(argn), '90', 2)) then
select_transform(JXFORM_ROT_90)
else
if keymatch(ParamStr(argn), '180', 3) then
select_transform(JXFORM_ROT_180)
else
if keymatch(ParamStr(argn), '270', 3) then
select_transform(JXFORM_ROT_270)
else
usage;
end
else
if keymatch(arg, '-scans', 2) then
begin
{ Set scan script. }
{$ifdef C_MULTISCAN_FILES_SUPPORTED}
Inc(argn);
if (argn >= argc) then { advance to next argument }
usage;
scansarg := ParamStr(argn);
{ We must postpone reading the file in case -progressive appears. }
{$else}
WriteLn(output, progname,
': sorry, multi-scan output was not compiled');
Stop(EXIT_FAILURE);
{$endif}
end
else
if keymatch(arg, '-transpose', 2) then
{ Transpose (across UL-to-LR axis). }
select_transform(JXFORM_TRANSPOSE)
else
if keymatch(arg, '-transverse', 7) then
{ Transverse transpose (across UR-to-LL axis). }
select_transform(JXFORM_TRANSVERSE)
else
if keymatch(arg, '-trim', 4) then
{ Trim off any partial edge MCUs that
the transform can't handle. }
transformoption.trim := TRUE
else
usage; { bogus switch }
end;
{ Post-switch-scanning cleanup }
if (for_real) then
begin
{$ifdef C_PROGRESSIVE_SUPPORTED}
if (simple_progressive) then { process -progressive; -scans can override }
jpeg_simple_progression(cinfo);
{$endif}
{$ifdef C_MULTISCAN_FILES_SUPPORTED}
if (scansarg <> '') then { process -scans if it was present }
begin
WriteLn('Scripts are not supported in PasJPEG.');
{if not read_scan_script(cinfo, scansarg) then
usage;
}
end;
{$endif}
end;
parse_switches := argn; { return index of next arg (file name) }
end;
{ The main program. }
{main (int argc, char **argv)}
var
srcinfo : jpeg_decompress_struct;
dstinfo : jpeg_compress_struct;
jsrcerr, jdsterr : jpeg_error_mgr;
{$ifdef PROGRESS_REPORT}
progress : cdjpeg_progress_mgr;
{$endif}
src_coef_arrays,
dst_coef_arrays : jvirt_barray_tbl_ptr;
file_index : int;
input_file : FILE;
output_file : FILE;
begin
{ On Mac, fetch a command line. }
{$ifdef USE_CCOMMAND}
argc := ccommand(@argv);
{$endif}
progname := ParamStr(0);
{ Initialize the JPEG decompression object with default error handling. }
srcinfo.err := jpeg_std_error(jsrcerr);
jpeg_create_decompress(@srcinfo);
{ Initialize the JPEG compression object with default error handling. }
dstinfo.err := jpeg_std_error(jdsterr);
jpeg_create_compress(@dstinfo);
{ Now safe to enable signal catcher.
Note: we assume only the decompression object will have virtual arrays. }
{$ifdef NEED_SIGNAL_CATCHER}
enable_signal_catcher(j_common_ptr(@srcinfo));
{$endif}
{ Scan command line to find file names.
It is convenient to use just one switch-parsing routine, but the switch
values read here are mostly ignored; we will rescan the switches after
opening the input file. Also note that most of the switches affect the
destination JPEG object, so we parse into that and then copy over what
needs to affects the source too. }
file_index := parse_switches(@dstinfo, 0, FALSE);
jsrcerr.trace_level := jdsterr.trace_level;
srcinfo.mem^.max_memory_to_use := dstinfo.mem^.max_memory_to_use;
{$ifdef TWO_FILE_COMMANDLINE}
{ Must have either -outfile switch or explicit output file name }
if (outfilename = '') then
begin
if (file_index <> ParamCount-1) then
begin
WriteLn(output, progname, ': must name one input and one output file');
usage;
end;
outfilename := ParamStr(file_index+1);
end
else
begin
if (file_index <> ParamCount-1) then
begin
WriteLn(output, progname, ': must name one input and one output file');
usage;
end;
end;
{$else}
{ Unix style: expect zero or one file name }
if (file_index < argc-1) then
begin
WriteLn(output, progname, ': only one input file');
usage;
end;
{$endif} { TWO_FILE_COMMANDLINE }
{ Open the input file. }
if (file_index < ParamCount) then
begin
assign(input_file, ParamStr(file_index));
{$push}{$I-}
reset(input_file, 1);
{$pop}
if (IOresult <> 0) then
begin
WriteLn(output, progname, ': can''t open ', ParamStr(file_index));
Stop(EXIT_FAILURE);
end;
end
else
begin
{ default input file is stdin }
assign(input_file, '');
reset(input_file, 1);
end;
{ Open the output file. }
if (outfilename <> '') then
begin
assign(output_file, outfilename);
{$push}{$I-}
rewrite(output_file, 1);
{$pop}
if (IOresult <> 0) then
begin
WriteLn(output, progname, ': can''t open ', outfilename);
Stop(EXIT_FAILURE);
end;
end
else
begin
{ default output file is stdout }
assign(output_file, '');
rewrite(output_file, 1);
end;
{$ifdef PROGRESS_REPORT}
start_progress_monitor(j_common_ptr(@dstinfo), @progress);
{$endif}
{ Specify data source for decompression }
jpeg_stdio_src(@srcinfo, @input_file);
{ Enable saving of extra markers that we want to copy }
jcopy_markers_setup(@srcinfo, copyoption);
{ Read file header }
{void} jpeg_read_header(@srcinfo, TRUE);
{ Any space needed by a transform option must be requested before
jpeg_read_coefficients so that memory allocation will be done right. }
{$ifdef TRANSFORMS_SUPPORTED}
jtransform_request_workspace(@srcinfo, transformoption);
{$endif}
{ Read source file as DCT coefficients }
src_coef_arrays := jpeg_read_coefficients(@srcinfo);
{ Initialize destination compression parameters from source values }
jpeg_copy_critical_parameters(@srcinfo, @dstinfo);
{ Adjust destination parameters if required by transform options;
also find out which set of coefficient arrays will hold the output. }
{$ifdef TRANSFORMS_SUPPORTED}
dst_coef_arrays := jtransform_adjust_parameters(@srcinfo, @dstinfo,
src_coef_arrays,
transformoption);
{$else}
dst_coef_arrays := src_coef_arrays;
{$endif}
{ Adjust default compression parameters by re-parsing the options }
file_index := parse_switches(@dstinfo, 0, TRUE);
{ Specify data destination for compression }
jpeg_stdio_dest(@dstinfo, @output_file);
{ Start compressor (note no image data is actually written here) }
jpeg_write_coefficients(@dstinfo, dst_coef_arrays);
{ Copy to the output file any extra markers that we want to preserve }
jcopy_markers_execute(@srcinfo, @dstinfo, copyoption);
{ Execute image transformation, if any }
{$ifdef TRANSFORMS_SUPPORTED}
jtransform_execute_transformation(@srcinfo, @dstinfo,
src_coef_arrays,
transformoption);
{$endif}
{ Finish compression and release memory }
jpeg_finish_compress(@dstinfo);
jpeg_destroy_compress(@dstinfo);
{void} jpeg_finish_decompress(@srcinfo);
jpeg_destroy_decompress(@srcinfo);
{ Close files, if we opened them }
close(input_file);
close(output_file);
{$ifdef PROGRESS_REPORT}
end_progress_monitor(j_common_ptr(@dstinfo));
{$endif}
{ All done. }
if jsrcerr.num_warnings + jdsterr.num_warnings <> 0 then
Stop(EXIT_WARNING)
else
Stop(EXIT_SUCCESS);
end.
