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)); {$I-} reset(input_file, 1); {$IFDEF IoCheck} {$I+} {$ENDIF} 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); {$I-} rewrite(output_file, 1); {$IFDEF IoCheck} {$I+} {$ENDIF} 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.