sdl_main.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    [e-mail]
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id: SDL_main.c,v 1.4 2002/04/22 21:38:02 wmay Exp $";
#endif

/* This file takes care of command line argument parsing, and stdio redirection
   in the MacOS environment.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>	
#if TARGET_API_MAC_CARBON
#include <Carbon.h>
#else
#include <Dialogs.h>
#include <Fonts.h>
#include <Events.h>
#include <Resources.h>
#include <Folders.h>
#endif

/* Include the SDL main definition header */
#include "SDL.h"
#include "SDL_main.h"
#ifdef main
#undef main
#endif

/* The standard output files */
#define STDOUT_FILE	"stdout.txt"
#define STDERR_FILE	"stderr.txt"

#if !defined(__MWERKS__) && !TARGET_API_MAC_CARBON
	/* In MPW, the qd global has been removed from the libraries */
	QDGlobals qd;
#endif

/* Structure for keeping prefs in 1 variable */
typedef struct {
    Str255  command_line;
    Str255  video_driver_name;
    Boolean output_to_file;
}  PrefsRecord;

/* See if the command key is held down at startup */
static Boolean CommandKeyIsDown(void)
{
	KeyMap  theKeyMap;

	GetKeys(theKeyMap);

	if (((unsigned char *) theKeyMap)[6] & 0x80) {
		return(true);
	}
	return(false);
}

/* Parse a command line buffer into arguments */
static int ParseCommandLine(char *cmdline, char **argv)
{
	char *bufp;
	int argc;

	argc = 0;
	for ( bufp = cmdline; *bufp; ) {
		/* Skip leading whitespace */
		while ( isspace(*bufp) ) {
			++bufp;
		}
		/* Skip over argument */
		if ( *bufp == '"' ) {
			++bufp;
			if ( *bufp ) {
				if ( argv ) {
					argv[argc] = bufp;
				}
				++argc;
			}
			/* Skip over word */
			while ( *bufp && (*bufp != '"') ) {
				++bufp;
			}
		} else {
			if ( *bufp ) {
				if ( argv ) {
					argv[argc] = bufp;
				}
				++argc;
			}
			/* Skip over word */
			while ( *bufp && ! isspace(*bufp) ) {
				++bufp;
			}
		}
		if ( *bufp ) {
			if ( argv ) {
				*bufp = '\0';
			}
			++bufp;
		}
	}
	if ( argv ) {
		argv[argc] = NULL;
	}
	return(argc);
}

/* Remove the output files if there was no output written */
static void cleanup_output(void)
{
	FILE *file;
	int empty;

	/* Flush the output in case anything is queued */
	fclose(stdout);
	fclose(stderr);

	/* See if the files have any output in them */
	file = fopen(STDOUT_FILE, "rb");
	if ( file ) {
		empty = (fgetc(file) == EOF) ? 1 : 0;
		fclose(file);
		if ( empty ) {
			remove(STDOUT_FILE);
		}
	}
	file = fopen(STDERR_FILE, "rb");
	if ( file ) {
		empty = (fgetc(file) == EOF) ? 1 : 0;
		fclose(file);
		if ( empty ) {
			remove(STDERR_FILE);
		}
	}
}

static int getCurrentAppName (StrFileName name) {
	
    ProcessSerialNumber process;
    ProcessInfoRec      process_info;
    FSSpec              process_fsp;
    
    process.highLongOfPSN = 0;
    process.lowLongOfPSN  = kCurrentProcess;
    process_info.processInfoLength = sizeof (process_info);
    process_info.processName    = NULL;
    process_info.processAppSpec = &process_fsp;
    
    if ( noErr != GetProcessInformation (&process, &process_info) )
       return 0;
    
    memcpy (name, process_fsp.name, process_fsp.name[0] + 1);
    return 1;
}

static int getPrefsFile (FSSpec *prefs_fsp, int create) {

    /* The prefs file name is the application name, possibly truncated, */
    /* plus " Preferences */
    
    #define  SUFFIX   " Preferences"
    #define  MAX_NAME 19             /* 31 - strlen (SUFFIX) */
    
    short  volume_ref_number;
    long   directory_id;
    StrFileName  prefs_name;
    StrFileName  app_name;
    
    /* Get Preferences folder - works with Multiple Users */
    if ( noErr != FindFolder ( kOnSystemDisk, kPreferencesFolderType, kDontCreateFolder,
                               &volume_ref_number, &directory_id) )
        exit (-1);
    
    if ( ! getCurrentAppName (app_name) )
        exit (-1);
    
    /* Truncate if name is too long */
    if (app_name[0] > MAX_NAME )
        app_name[0] = MAX_NAME;
        
    memcpy (prefs_name + 1, app_name + 1, app_name[0]);    
    memcpy (prefs_name + app_name[0] + 1, SUFFIX, strlen (SUFFIX));
    prefs_name[0] = app_name[0] + strlen (SUFFIX);
   
    /* Make the file spec for prefs file */
    if ( noErr != FSMakeFSSpec (volume_ref_number, directory_id, prefs_name, prefs_fsp) )
        if ( !create )
            return 0;
        else {
            /* Create the prefs file */
            memcpy (prefs_fsp->name, prefs_name, prefs_name[0] + 1);
            prefs_fsp->parID   = directory_id;
            prefs_fsp->vRefNum = volume_ref_number;
                
            FSpCreateResFile (prefs_fsp, '????', 'pref', 0);
            
            if ( noErr != ResError () )
                return 0;
        }
      
    return 1;
}

static int readPrefsResource (PrefsRecord *prefs) {
    
    Handle prefs_handle;
    
    prefs_handle = Get1Resource( 'CLne', 128 );

	if (prefs_handle != NULL) {
		int offset = 0;
		int j      = 0;
		
		HLock(prefs_handle);
		
		/* Get command line string */	
		memcpy (prefs->command_line, *prefs_handle, (*prefs_handle)[0]+1);

		/* Get video driver name */
		offset += (*prefs_handle)[0] + 1;	
		memcpy (prefs->video_driver_name, *prefs_handle + offset, (*prefs_handle)[offset] + 1);		
		
		/* Get save-to-file option (1 or 0) */
		offset += (*prefs_handle)[offset] + 1;
		prefs->output_to_file = (*prefs_handle)[offset];
		
		ReleaseResource( prefs_handle );
    
        return ResError() == noErr;
    }

    return 0;
}

static int writePrefsResource (PrefsRecord *prefs, short resource_file) {

    Handle prefs_handle;
    
    UseResFile (resource_file);
    
    prefs_handle = Get1Resource ( 'CLne', 128 );
    if (prefs_handle != NULL)
        RemoveResource (prefs_handle);
    
    prefs_handle = NewHandle ( prefs->command_line[0] + prefs->video_driver_name[0] + 4 );
    if (prefs_handle != NULL) {
    
        int offset;
        
        HLock (prefs_handle);
        
        /* Command line text */
        offset = 0;
        memcpy (*prefs_handle, prefs->command_line, prefs->command_line[0] + 1);
        
        /* Video driver name */
        offset += prefs->command_line[0] + 1;
        memcpy (*prefs_handle + offset, prefs->video_driver_name, prefs->video_driver_name[0] + 1);