wildmidi_lib.c

来自「WildMidi Midi Library and Player」· C语言 代码 · 共 1,168 行 · 第 1/5 页

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};

#define SAMPLE_16BIT 0x01
#define SAMPLE_UNSIGNED 0x02
#define SAMPLE_LOOP 0x04
#define SAMPLE_PINGPONG 0x08
#define SAMPLE_REVERSE 0x10
#define SAMPLE_SUSTAIN 0x20
#define SAMPLE_ENVELOPE 0x40

#ifdef DEBUG_SAMPLES
#define SAMPLE_CONVERT_DEBUG(dx) printf("\r%s\n",dx)
#else
#define SAMPLE_CONVERT_DEBUG(dx)
#endif

#ifdef DEBUG_MIDI
#define MIDI_EVENT_DEBUG(dx,dy) printf("\r%s, %x\n",dx,dy) 
#else
#define MIDI_EVENT_DEBUG(dx,dy)
#endif

#define WM_ERR_MEM		0
#define WM_ERR_STAT		1
#define WM_ERR_LOAD		2
#define WM_ERR_OPEN		3
#define WM_ERR_READ		4
#define WM_ERR_INVALID		5
#define WM_ERR_CORUPT		6
#define WM_ERR_NOT_INIT		7
#define WM_ERR_INVALID_ARG	8

#define MAX_AUTO_AMP 2.0

#define FPBITS 10
#define FPMASK ((1L<<FPBITS)-1L)


void do_note_off (unsigned char ch, struct _mdi *mdi, unsigned long int ptr);
void do_note_on (unsigned char ch, struct _mdi *mdi, unsigned long int ptr);
void do_aftertouch (unsigned char ch, struct _mdi *mdi, unsigned long int ptr);
void do_control (unsigned char ch, struct _mdi *mdi, unsigned long int ptr);
void do_patch (unsigned char ch, struct _mdi *mdi, unsigned long int ptr);
void do_channel_pressure (unsigned char ch, struct _mdi *mdi, unsigned long int ptr);
void do_pitch (unsigned char ch, struct _mdi *mdi, unsigned long int ptr);
void do_message (unsigned char ch, struct _mdi *mdi, unsigned long int ptr);

void (*do_event[])(unsigned char ch, struct _mdi *midifile, unsigned long int ptr) = {
	*do_note_off,
	*do_note_on,
	*do_aftertouch,
	*do_control,
	*do_patch,
	*do_channel_pressure,
	*do_pitch,
	*do_message
};

/*
 * =========================
 * Internal Functions
 * =========================
 */


void
WM_ERROR( const char * func, unsigned long int lne, int wmerno, const char * wmfor, int error) {
	const char * errors[] = {
		"Unable to obtain memory\0",
		"Unable to stat\0",
		"Unable to load\0",
		"Unable to open\0",
		"Unable to read\0",
		"Invalid or Unsuported file format\0",
		"File corrupt\0",
		"Library not Initialized\0",
		"Invalid argument\0"
	};
	if (wmfor != NULL) {
		if (error != 0) {
			fprintf(stderr,"\rlibWildMidi(%s:%lu): ERROR %s %s (%s)\n",func, lne, errors[wmerno], wmfor, strerror(error));
		} else {
			fprintf(stderr,"\rlibWildMidi(%s:%lu): ERROR %s %s\n",func, lne, errors[wmerno], wmfor);
		}
	} else {
		if (error != 0) {
			fprintf(stderr,"\rlibWildMidi(%s:%lu): ERROR %s (%s)\n",func, lne, errors[wmerno], strerror(error));
		} else {
			fprintf(stderr,"\rlibWildMidi(%s:%lu): ERROR %s\n",func, lne, errors[wmerno]);
		}
	}

}

unsigned char *
WM_BufferFile (const char *filename, unsigned long int *size) {
	int buffer_fd;
	char *data;
	struct stat buffer_stat;
#ifndef _WIN32
	char *home = NULL;
	struct passwd *pwd_ent;
	char buffer_dir[1024];
#endif
	
	char *buffer_file = malloc(strlen(filename) + 1);

	if (buffer_file == NULL) {
		WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_MEM, NULL, errno);
		WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_LOAD, filename, errno);
		return NULL;
	}
	
	strcpy (buffer_file, filename);
#ifndef _WIN32
	if (strncmp(buffer_file,"~/",2) == 0) {
		if ((pwd_ent = getpwuid (getuid ()))) {
			home = pwd_ent->pw_dir;
		} else {
			home = getenv ("HOME");
		}
		if (home) {
			buffer_file = realloc(buffer_file,(strlen(buffer_file) + strlen(home) + 1));
			if (buffer_file == NULL) {
				WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_MEM, NULL, errno);
				WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_LOAD, filename, errno);
				free(buffer_file);
				return NULL;
			}
			memmove((buffer_file + strlen(home)), (buffer_file + 1), (strlen(buffer_file)));
			strncpy (buffer_file, home,strlen(home));
		}
	} else if (buffer_file[0] != '/') {
		getcwd(buffer_dir,1024);
		if (buffer_dir[strlen(buffer_dir)-1] != '/') {
			buffer_dir[strlen(buffer_dir)+1] = '\0';
			buffer_dir[strlen(buffer_dir)] = '/';
		}
		buffer_file = realloc(buffer_file,(strlen(buffer_file) + strlen(buffer_dir) + 1));
		if (buffer_file == NULL) {
			WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_MEM, NULL, errno);
			WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_LOAD, filename, errno);
			free(buffer_file);
			return NULL;
		}
		memmove((buffer_file + strlen(buffer_dir)), buffer_file, strlen(buffer_file)+1);
		strncpy (buffer_file,buffer_dir,strlen(buffer_dir));
	}
#endif
	if (stat(buffer_file,&buffer_stat)) {
		WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_STAT, filename, errno);
		free(buffer_file);
		return NULL;
	}
	*size = buffer_stat.st_size;
	data = malloc(*size);
	if (data == NULL) {
		WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_MEM, NULL, errno);
		WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_LOAD, filename, errno);
		free(buffer_file);
		return NULL;
	}
#ifdef _WIN32
	if ((buffer_fd = open(buffer_file,(O_RDONLY | O_BINARY))) == -1) {
#else
	if ((buffer_fd = open(buffer_file,O_RDONLY)) == -1) {
#endif
		WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_OPEN, filename, errno);
		free(buffer_file);
		free(data);
		return NULL;
	}
	if (read(buffer_fd,data,*size) != buffer_stat.st_size) {
		WM_ERROR(__FUNCTION__, __LINE__, WM_ERR_READ, filename, errno);
		free(buffer_file);
		free(data);
		close(buffer_fd);
		return NULL;
	}
	close(buffer_fd);
	free(buffer_file);
	return data;						
}

inline void
WM_Lock (int * wmlock) {
	LOCK_START:
	if (__builtin_expect(((*wmlock) == 0),1)) {
		(*wmlock)++;
		if (__builtin_expect(((*wmlock) == 1), 1)) {
			return;
		}
		(*wmlock)--;
	}
#ifdef _WIN32
	Sleep(10);
#else
	usleep(500);
#endif
	goto LOCK_START;
}

inline void
WM_Unlock (int *wmlock) {
	(*wmlock)--;
}

void
WM_InitPatches ( void ) {
	int i;
	for (i = 0; i < 128; i++) {
		patch[i] = NULL;
	}	
}

void
WM_FreePatches ( void ) {
	int i;
	struct _patch * tmp_patch;
	struct _sample * tmp_sample;

	WM_Lock(&patch_lock);
	for (i = 0; i < 128; i++) {
		if (patch[i] != NULL) {