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path: root/src/iemlib1/soundfile_info.c
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/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.

iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2003 */

#ifdef NT
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif

#include "m_pd.h"
#include "iemlib.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <math.h>

#define SFI_HEADER_SAMPLERATE 0
#define SFI_HEADER_FILENAME 1
#define SFI_HEADER_MULTICHANNEL_FILE_LENGTH 2
#define SFI_HEADER_HEADERBYTES 3
#define SFI_HEADER_CHANNELS 4
#define SFI_HEADER_BYTES_PER_SAMPLE 5
#define SFI_HEADER_ENDINESS 6

#define SFI_HEADER_SIZE 7



/* -------------------- soundfile_info ------------------------------- */

static t_class *soundfile_info_class;

typedef struct _soundfile_info
{
	t_object	x_obj;
	long			*x_begmem;
	int				x_size;
	t_atom		x_atheader[SFI_HEADER_SIZE];
	t_canvas	*x_canvas;
	void			*x_list_out;
} t_soundfile_info;

static short soundfile_info_str2short(char *cvec)
{
	short s=0;
	unsigned char *uc=(unsigned char *)cvec;

	s += (short)(*uc);
	s += (short)(*(uc+1)*256);
	return(s);
}

static long soundfile_info_str2long(char *cvec)
{
	long l=0;
	unsigned char *uc=(unsigned char *)cvec;

	l += (long)(*uc);
	l += (long)(*(uc+1)*256);
	l += (long)(*(uc+2)*65536);
	l += (long)(*(uc+3)*16777216);
	return(l);
}

static void soundfile_info_read(t_soundfile_info *x, t_symbol *filename)
{
	char completefilename[400];
	int i, n, n2, n4, filesize, read_chars, header_size=0, ch, bps, sr;
	FILE *fh;
	t_atom *at;
	char *cvec;
	long ll;
	short ss;

	if(filename->s_name[0] == '/')/*make complete path + filename*/
	{
		strcpy(completefilename, filename->s_name);
	}
	else if(((filename->s_name[0] >= 'A')&&(filename->s_name[0] <= 'Z')||
			(filename->s_name[0] >= 'a')&&(filename->s_name[0] <= 'z'))&&
			(filename->s_name[1] == ':')&&(filename->s_name[2] == '/'))
	{
		strcpy(completefilename, filename->s_name);
	}
	else
	{
		strcpy(completefilename, canvas_getdir(x->x_canvas)->s_name);
		strcat(completefilename, "/");
		strcat(completefilename, filename->s_name);
	}

	fh = fopen(completefilename,"rb");
	if(!fh)
	{
		post("soundfile_info_read: cannot open %s !!\n", completefilename);
	}
	else
	{
		n = x->x_size;
		n2 = sizeof(short) * x->x_size;
		n4 = sizeof(long) * x->x_size;
		fseek(fh, 0, SEEK_END);
		filesize = ftell(fh);
		fseek(fh,0,SEEK_SET);
		read_chars = (int)fread(x->x_begmem, sizeof(char), n4, fh) /2;
		fclose(fh);
//		post("read chars = %d", read_chars);
		cvec = (char *)x->x_begmem;
		if(read_chars > 4)
		{
			if(strncmp(cvec, "RIFF", 4))
			{
				post("soundfile_info_read-error:  %s is no RIFF-WAVE-file", completefilename);
				goto soundfile_info_end;
			}
			header_size += 8;
			cvec += 8;
			if(strncmp(cvec, "WAVE", 4))
			{
				post("soundfile_info_read-error:  %s is no RIFF-WAVE-file", completefilename);
				goto soundfile_info_end;
			}
			header_size += 4;
			cvec += 4;

			for(i=header_size/2; i<read_chars; i++)
			{
				if(!strncmp(cvec, "fmt ", 4))
					goto soundfile_info_fmt;
				header_size += 2;
				cvec += 2;
			}
			post("soundfile_info_read-error:  %s has at begin no format-chunk", completefilename);
			goto soundfile_info_end;

soundfile_info_fmt:
			header_size += 4;
			cvec += 4;
			ll = soundfile_info_str2long(cvec);
			if(ll != 16)
			{
				post("soundfile_info_read-error:  %s has a format-chunk not equal to 16", completefilename);
				goto soundfile_info_end;
			}
			header_size += 4;
			cvec += 4;
			ss = soundfile_info_str2short(cvec);
			/* format */
			if(ss != 1)					   /* PCM = 1 */
			{
				post("soundfile_info_read-error:  %s is not PCM-format coded", completefilename);
				goto soundfile_info_end;
			}
			header_size += 2;
			cvec += 2;
			ss = soundfile_info_str2short(cvec);
			/* channels */
			if((ss < 1) || (ss > 100))
			{
				post("soundfile_info_read-error:  %s has no common channel-number", completefilename);
				goto soundfile_info_end;
			}
			SETFLOAT(x->x_atheader+SFI_HEADER_CHANNELS, (float)ss);
			ch = ss;
			header_size += 2;
			cvec += 2;
			ll = soundfile_info_str2long(cvec);
			/* samplerate */
			if((ll > 400000) || (ll < 200))
			{
				post("soundfile_info_read-error:  %s has no common samplerate", completefilename);
				goto soundfile_info_end;
			}
			SETFLOAT(x->x_atheader+SFI_HEADER_SAMPLERATE, (float)ll);
			sr = ll;
			header_size += 4;
			cvec += 4;

			header_size += 4;	/* bytes_per_sec */
			cvec += 4;
			ss = soundfile_info_str2short(cvec);

			/* bytes_per_sample */
			if((ss < 1) || (ss > 100))
			{
				post("soundfile_info_read-error:  %s has no common number of bytes per sample", completefilename);
				goto soundfile_info_end;
			}
			SETFLOAT(x->x_atheader+SFI_HEADER_BYTES_PER_SAMPLE, (float)(ss/ch));
			bps = ss;
			header_size += 2;
			cvec += 2;

			header_size += 2;	/* bits_per_sample */
			cvec += 2;

			for(i=header_size/2; i<read_chars; i++)
			{
				if(!strncmp(cvec, "data", 4))
					goto soundfile_info_data;
				header_size += 2;
				cvec += 2;
			}
			post("soundfile_info_read-error:  %s has at begin no data-chunk", completefilename);
			goto soundfile_info_end;

soundfile_info_data:
			header_size += 8;
			cvec += 8;

			SETFLOAT(x->x_atheader+SFI_HEADER_HEADERBYTES, (float)header_size);
			
			filesize -= header_size;
			filesize /= bps;
			SETFLOAT(x->x_atheader+SFI_HEADER_MULTICHANNEL_FILE_LENGTH, (float)filesize);
			SETSYMBOL(x->x_atheader+SFI_HEADER_ENDINESS, gensym("l"));
			SETSYMBOL(x->x_atheader+SFI_HEADER_FILENAME, gensym(completefilename));

/*			post("ch = %d", ss);
			post("sr = %d", ll);
			post("bps = %d", ss/ch);
			post("head = %d", header_size);
			post("len = %d", filesize);*/

			outlet_list(x->x_list_out, &s_list, SFI_HEADER_SIZE, x->x_atheader);


soundfile_info_end:

			;
		}
	}
}

static void soundfile_info_free(t_soundfile_info *x)
{
	freebytes(x->x_begmem, x->x_size * sizeof(long));
}

static void *soundfile_info_new(void)
{
	t_soundfile_info *x = (t_soundfile_info *)pd_new(soundfile_info_class);

	x->x_size = 10000;
	x->x_begmem = (long *)getbytes(x->x_size * sizeof(long));
	x->x_list_out = outlet_new(&x->x_obj, &s_list);
	x->x_canvas = canvas_getcurrent();
	return (x);
}

/* ---------------- global setup function -------------------- */

void soundfile_info_setup(void)
{
	soundfile_info_class = class_new(gensym("soundfile_info"), (t_newmethod)soundfile_info_new,
					(t_method)soundfile_info_free, sizeof(t_soundfile_info), 0, 0);
	class_addmethod(soundfile_info_class, (t_method)soundfile_info_read, gensym("read"), A_SYMBOL, 0);
	class_sethelpsymbol(soundfile_info_class, gensym("iemhelp/help-soundfile_info"));
}