Initial commit

AUTHORS

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+Yann Weber <sndpipe@yannweb.net>

COPYING

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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

Makefile

@@ -0,0 +1,32 @@
+TARGET=sndpipe
+OBJ=$(TARGET).o
+SRC=$(TARGET).c
+
+ifeq ($(DEBUG), 0)
+	CFLAGS=-Wall -Werror
+        LDFLAGS=-s
+else
+	CFLAGS=-Wall -Werror -g
+        LDFLAGS=-g
+endif
+ifeq ($(SDL), 1)
+        CFLAGS += -DSDL1=1
+        LDFLAGS += -lSDL
+else
+        CFLAGS += -DSDL2=1
+        LDFLAGS += -lSDL2
+endif
+
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	gcc $(LDFLAGS) $< -o $@
+
+$(OBJ): $(SRC)
+	gcc $(CFLAGS) -c $< -o $@
+
+.PHONY: clean
+
+clean:
+	-rm -fv $(TARGET) $(OBJ)

README.txt

@@ -0,0 +1,52 @@
+                               +---------+
+                               | SndPipe |
+                               +---------+
+
+Send STDIN to sound card using SDL.
+
+Dependencies :
+==============
+
+ - SDL2, but SDL1 support should be implemented in the future.
+ - make
+ - gcc
+ - python3 (for 8bit synth test)
+
+Build instructions :
+====================
+
+make
+
+* Debug build :
+---------------
+
+DEBUG=1 make
+
+* Specify SDL version :
+-----------------------
+
+SDL=1 make
+#or
+SDL=2 make
+
+Getting some help :
+===================
+
+./sndpipe -h
+
+Generating sounds :
+===================
+
+* White noise :
+---------------
+
+./sndpipe < /dev/urandom
+
+* Sinwaves :
+------------
+
+python3 examples/sin.py | ./sndpipe
+
+python3 examples/sin.py -B16 -S | ./sndpipe -B16 -S
+
+python3 examples/sin.py -B32 -S | ./sndpipe -B32

examples/binaural.py

@@ -0,0 +1,32 @@
+import sys
+from synth import *
+
+base_mod = 1.0
+
+bimod = .075
+
+if len(sys.argv) > 1:
+    base_mod = float(sys.argv[1])
+if len(sys.argv) > 2:
+    bimod = float(sys.argv[2])
+
+bm = base_mod
+
+while True:
+
+    wv0 = sinwave(0.02 * bm)
+    #wv1 = sinwave(0.025 * bm)
+    #r0 = mixer(wv0, wv1)
+    r0 = wv0
+
+    bm += bimod
+
+    wv0 = sinwave(0.02 * bm)
+    #wv1 = sinwave(0.025 * bm)
+    #r1 = mixer(wv0, wv1)
+    r1=wv0
+
+    samples = output_sampler(r0, r1)
+    while True:
+        sys.stdout.buffer.write(next(samples))
+

examples/lfo.py

@@ -0,0 +1,19 @@
+from synth import *
+
+while True:
+
+    wv0 = sinwave()
+    wv1 = sinwave(0.1)
+    wv2 = sinwave(0.011)
+    lfo0 = sinwave(0.01)
+    lfo1 = sinwave(0.02)
+    wv2 = vol_lfo(wv2, lfo0)
+    mix = mixer(wv0, wv1, wv2)
+    r = vol_lfo(mix, lfo1)
+    #r = highpass(mix, 150)
+    #r = wv1
+    #r = mix
+    samples = output_sampler(r)
+    while True:
+        sys.stdout.buffer.write(next(samples))
+

examples/orgue.py

@@ -0,0 +1,24 @@
+import sys
+from synth import *
+
+base_mod = 1.0
+
+if len(sys.argv) > 1:
+    base_mod = float(sys.argv[1])
+
+bm = base_mod
+
+while True:
+
+    wv0 = sinwave(0.001 * bm)
+    wv1 = sinwave(0.1*bm)
+    wv2 = sinwave(0.011*bm)
+    lfo0 = sinwave(0.01*bm)
+    lfo1 = sinwave(0.02*bm)
+    wv2 = vol_lfo(wv2, lfo0)
+    mix = mixer(wv0, wv1, wv2)
+    r = vol_lfo(mix, lfo1)
+    samples = output_sampler(r)
+    while True:
+        sys.stdout.buffer.write(next(samples))
+

examples/orgue_stereo.py

@@ -0,0 +1,40 @@
+import sys
+from synth import *
+
+base_mod = 1.0
+
+bimod = .12
+
+if len(sys.argv) > 1:
+    base_mod = float(sys.argv[1])
+if len(sys.argv) > 2:
+    bimod = float(sys.argv[2])
+
+bm = base_mod
+
+while True:
+
+    wv0 = sinwave(0.001 * bm)
+    wv1 = sinwave(0.1*bm)
+    wv2 = sinwave(0.011*bm)
+    lfo0 = sinwave(0.01*bm)
+    lfo1 = sinwave(0.02*bm)
+    wv2 = vol_lfo(wv2, lfo0)
+    mix = mixer(wv0, wv1, wv2)
+    r = vol_lfo(mix, lfo1)
+
+    bm += bimod
+
+    wv0 = sinwave(0.001 * bm)
+    wv1 = sinwave(0.1*bm)
+    wv2 = sinwave(0.011*bm)
+    lfo0 = sinwave(0.01*bm)
+    lfo1 = sinwave(0.02*bm)
+    wv2 = vol_lfo(wv2, lfo0)
+    mix = mixer(wv0, wv1, wv2)
+    r2 = vol_lfo(mix, lfo1)
+
+    samples = output_sampler(r, r2)
+    while True:
+        sys.stdout.buffer.write(next(samples))
+

examples/sin.py

@@ -0,0 +1,41 @@
+#!/usr/bin/python3
+
+import argparse
+import sys
+
+from synth import *
+
+parser = argparse.ArgumentParser(description="Generate sinwaves")
+parser.add_argument("--output-freq", "-f", type=int, default=48000)
+parser.add_argument("--bit-size", "-B", choices=['8','16','32'], default='8',
+                    help="Output numbers bit size")
+parser.add_argument("--endianess", "-e", choices=['big', 'little'],
+                    default='little')
+parser.add_argument("--signed", "-S", action="store_true", default=False)
+parser.add_argument("--float32", "-F", action="store_true", default=False)
+parser.add_argument("--samples", "-s", type=int, default=4096)
+parser.add_argument("--channels", "-c", type=int, default=2)
+parser.add_argument("--angle-step", "-a", type=float, default=.075)
+
+args = parser.parse_args()
+
+args.bit_size = int(args.bit_size)
+print(args, file=sys.stderr)
+
+if args.float32:
+    samples = sinwave_float32(step=args.angle_step, endianess=args.endianess)
+    buff = bytearray([0 for _ in range(args.samples*args.channels*4)])
+    while True:
+        for i in range(0,args.samples*args.channels,4):
+            buff[i:i+4] = next(samples)
+        sys.stdout.buffer.write(buff)
+    exit(0)
+
+wv0 = sinwave(args.angle_step, bitsz=args.bit_size, signed=args.signed)
+samples = output_sampler(wv0, channels=args.channels, samples=args.samples,
+                         freq=args.output_freq, bitsz=args.bit_size,
+                         endianess=args.endianess, signed=args.signed)
+while True:
+    smpl = next(samples)
+    sys.stdout.buffer.write(smpl)
+exit(0)

examples/synth.py

@@ -0,0 +1,135 @@
+#Copyright 2017 Yann Weber
+#
+#This file is part of SndPipe.
+#
+#SndPipe is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#any later version.
+#
+#SndPipe 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 General Public License for more details.
+#
+#You should have received a copy of the GNU General Public License
+#along with SndPipe.  If not, see <http://www.gnu.org/licenses/>.
+
+
+import math
+import sys
+import struct
+
+BITMAX = lambda bsz: (1<<bsz)-1
+
+def sinwave_float32(step=0.01, endianess='little'):
+    i = 0.0
+    if endianess is None:
+        e = ''
+    elif endianess == 'little':
+        e = '<'
+    else:
+        e = '>'
+    while True:
+        i += step
+        i %= (math.pi*2)
+        yield struct.pack('%cf'%e, math.sin(i))
+
+def sinwave(step=0.01, bitsz=8, signed=False):
+    i = 0.0
+    while True:
+        i += step
+        i %= (math.pi*2)
+        if signed:
+            yield int(math.sin(i) * (BITMAX(bitsz)/2))
+        else:
+            yield int((math.sin(i)+1)/2 * BITMAX(bitsz))
+
+def mixer(*waves):
+    channels = []
+    for wave in waves:
+        if isinstance(wave, tuple):
+            wave, vol = wave
+        else:
+            wave, vol = wave, 1.0
+        channels.append((wave, vol/len(waves)))
+    while True:
+        yield int(sum([next(wave)*vol for wave, vol in channels]))
+
+def filter(wave, freq=10, high=True, glitch=False, bitsz=8):
+    hist = [next(wave)]
+
+    while True:
+        c = next(wave)
+        r = int(sum(hist)/len(hist))
+        if high:
+            if glitch:
+                r = (c - r) % BITMAX(bitsz)
+            elif c < r:
+                r = 0
+            else:
+                r = c - r
+        hist = [c] + (hist if len(hist) < freq else hist[:-1])
+        yield r
+
+def lowpass(wave, freq=500):
+    return filter(wave, freq, False)
+
+def highpass(wave, freq=500):
+    return filter(wave, freq, True)
+
+
+def vol_lfo(wave, wave_arg, bitsz=8):
+    while True:
+        yield int(next(wave) * next(wave_arg) / BITMAX(bitsz))
+
+
+def output_sampler(*args, channels=2, samples=4096, freq=48000, bitsz=8,
+        endianess='little', signed=False):
+    if channels < 1:
+        raise ValueError("channels must be > 1 but %d given" % channels)
+    if len(args) == 0:
+        raise ValueError("You must give at least one generator")
+    if len(args) > 1 and channels != len(args):
+        msg = "If more than one generator given, the count must match the \
+channel argument. But %d generator given and channels is %d"
+        raise ValueError(msg % (len(args), channels))
+
+    if len(args) == 1:
+        if channels == 1:
+            nxt_sample = lambda waves: [next(waves[0])]
+        else:
+            nxt_sample = lambda waves: [next(waves[0])]*2
+    else:
+        nxt_sample = lambda waves: map(next, waves)
+
+    if bitsz != 8 or signed:
+        nxt_arg = lambda: nxt_sample(args)
+        gen = _output_sampler_multibits(nxt_arg, channels, samples, freq, bitsz,
+                                        endianess, signed)
+        while True:
+            yield next(gen)
+        raise StopIteration()
+        return
+
+    buff = bytearray([0 for _ in range(samples*channels)])
+    while True:
+        for i in range(0,samples*channels, channels):
+            buff[i:i+channels] = nxt_sample(args)
+        yield buff
+
+def _output_sampler_multibits(nxt_sample, channels, samples, freq, bitsz,
+        endianess, signed):
+    if bitsz not in (8,16,32):
+        raise ValueError("Bitsize must be in (8,16,32) but %d given" % bitsz)
+    Bsz = bitsz//8
+    buff = bytearray([0 for _ in range(samples * channels * Bsz)])
+    while True:
+        for i in range(0, samples*channels*Bsz, channels*Bsz):
+            nxt = nxt_sample()
+            for j in range(channels):
+                st = i + (j*Bsz)
+                buff[st:st+Bsz] = nxt[j].to_bytes(Bsz, endianess,
+                                                    signed=signed)
+        yield buff
+

sndpipe.c

@@ -0,0 +1,349 @@
+/*
+ * Copyright 2017 Yann Weber
+ * 
+ * This file is part of SndPipe.
+ * 
+ * SndPipe is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ * 
+ * SndPipe 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with SndPipe.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <errno.h>
+
+#ifdef SDL2
+	#include <SDL2/SDL.h>
+#else
+	#include <SDL/SDL.h>
+	#pragma GCC error "Not supported yet :'(" 
+#endif
+
+#define SNDPIPE_LONG_OPT {\
+	{"freq", required_argument, 0, 'f'},\
+	{"signed", no_argument, 0, 'S'},\
+	{"bit-size", required_argument, 0, 'B'},\
+	{"endianness", required_argument, 0, 'E'},\
+	{"float", no_argument, 0, 'F'},\
+	{"channels", required_argument, 0, 'c'},\
+	{"samples", required_argument, 0, 's'},\
+	{"output", required_argument, 0, 'o'},\
+	{"no-sound", no_argument, 0, 'N'},\
+	{"verbose", no_argument, 0, 'v'},\
+	{"help", no_argument, 0, 'h'},\
+	{0,	0, 	0,	0}\
+}
+#define SNDPIPE_SHORT_OPT "f:SB:E:Fc:s:o:Nvh"
+#define SNDPIPE_OPT_HELP {\
+	{"Input frequencie (default is 48000)", "FREQ"},\
+	{"If given signed numbers are expected (default for 32 bits)", NULL},\
+	{"Number of bits per number. One of : 32, 16 and 8 (integers only)",\
+		"BIT_COUNT"},\
+	{"Number endianess. Accepted values are : LSB, MSB and SYS (system's \
+native byte order)", "BYTEORDER"},\
+	{"If given, floating point numbers are excepted instead of intergers\
+ (32 bits only)",\
+		NULL},\
+	{"Channels count. 1 for mono, 2 for stereo, ...", "COUNT"},\
+	{"Samples per audioframe. Default value is 4096", "INT"},\
+	{"Output filename. STDOUT if '-' given", "FILENAME"},\
+	{"Don't play sound on soundcard using SDL", NULL},\
+	{"Display informations on stderr when given", NULL},\
+	{"Print this help and exit", NULL},\
+	{"", NULL}\
+}
+
+#define SNDPIPE_UNSIGNED 0
+#define SNDPIPE_SIGNED	1
+
+#define SNDPIPE_ESYS 0
+#define SNDPIPE_ELSB 2
+#define SNDPIPE_EMSB 4
+
+#define SNDPIPE_BSZ_8 0
+#define SNDPIPE_BSZ_16 8
+#define SNDPIPE_BSZ_32 16
+
+#define SNDPIPE_INT32 0
+#define SNDPIPE_FLOAT32 32
+
+#define SNDPIPE_SDL_FMT {\
+	AUDIO_U8,\
+	AUDIO_S8,\
+	0,\
+	0,\
+	0,\
+	0,\
+	0,\
+	0,\
+	AUDIO_U16SYS,\
+	AUDIO_S16SYS,\
+	AUDIO_U16LSB,\
+	AUDIO_S16LSB,\
+	AUDIO_U16MSB,\
+	AUDIO_S16MSB,\
+	0,\
+	0,\
+	AUDIO_S32SYS,\
+	AUDIO_F32SYS,\
+	AUDIO_S32LSB,\
+	AUDIO_F32LSB,\
+	AUDIO_S32MSB,\
+	AUDIO_F32MSB\
+}
+
+static int VERBOSITY = 0;
+static int SILENT = 0;
+
+void usage()
+{
+	static struct option opts[] = SNDPIPE_LONG_OPT;
+	static char *help[][2] = SNDPIPE_OPT_HELP;
+	size_t i;
+	printf("Usage : generator | sndpipe [OPTIONS]\n");
+	printf("or : sndpipe [OPTIONS] < file\n");
+	printf("\t\n");
+	printf("Options list\n");
+	i=0;
+	while(opts[i].name)
+	{
+		printf("\t-%c, --%s", opts[i].val, opts[i].name);
+		if(opts[i].has_arg == required_argument)
+		{
+			printf("=%s\n",
+				help[i][1]?help[i][1]:"ARG");
+		}
+		else if(opts[i].has_arg == optional_argument)
+		{
+			printf("[=%s]\n",
+				help[i][1]?help[i][1]:"ARG");
+		}
+		else
+		{
+			printf("\n");
+		}
+		printf("\t\t%s\n\n", help[i][0]);
+		i++;
+	}
+}
+
+
+
+void audio_cllbck(void *udata, Uint8 *stream, int len)
+{
+	int ret;
+	while(len)
+	{
+		if((ret = read(0, stream, len)) == -1)
+		{
+			perror("Error reading stdin");
+			exit(1);
+		}
+
+		if (ret == 0)
+		{
+			fprintf(stderr, "Stdin EOF... Exiting...\n");
+			*(int*)udata = 0;
+			break;
+		}
+		
+		len -= ret;
+	}
+	return;
+}
+
+int main(int argc, char **argv)
+{
+	static struct option long_opts[] = SNDPIPE_LONG_OPT;
+	static SDL_AudioFormat opt_fmt[] = SNDPIPE_SDL_FMT;
+	SDL_AudioSpec want, have;
+	SDL_AudioDeviceID dev;
+	int running, c, opt_i, ret, fmt_idx;
+	short err;
+
+	SDL_memset(&want, 0, sizeof(want));
+
+	want.freq = 48000;
+	want.format = AUDIO_U8;
+	want.channels = 2;
+	want.samples = 4096;
+	want.callback = audio_cllbck;
+	want.userdata = &running;
+
+	fmt_idx = 0;
+
+	while(1)
+	{
+
+		c = getopt_long(argc, argv, SNDPIPE_SHORT_OPT, long_opts, &opt_i);
+		if(c == -1)
+		{
+			break;
+		}
+		switch(c)
+		{
+			case 'v':
+				VERBOSITY++;
+				break;
+			case 'f':
+				want.freq = atoi(optarg);
+				break;
+			case 'S':
+				fmt_idx |= SNDPIPE_SIGNED;
+				break;
+			case 'B':
+				switch(ret = atoi(optarg))
+				{
+					case 8:
+						fmt_idx |= SNDPIPE_BSZ_8;
+						break;
+					case 16:
+						fmt_idx |= SNDPIPE_BSZ_16;
+						break;
+					case 32:
+						fmt_idx |= SNDPIPE_BSZ_32;
+						break;
+					default:
+						fprintf(stderr, "\
+Invalid bits count %d\n", ret);
+						err = 1;
+						break;
+				}
+				break;
+			case 'E':
+				if( !strncmp("LSB", optarg, 4)\
+					|| !strncmp("lsb", optarg, 4))
+				{
+						fmt_idx |= SNDPIPE_ELSB;
+				}
+				else if(!strncmp("MSB", optarg, 4)\
+					|| !strncmp("msb", optarg, 4))
+				{
+						fmt_idx |= SNDPIPE_EMSB;
+				}
+				else if(!strncmp("SYS", optarg, 4)\
+					|| !strncmp("sys", optarg, 4))
+				{
+						fmt_idx |= SNDPIPE_ESYS;
+				}
+				else
+				{
+						fprintf(stderr, "\
+Invalid endianness '%s'\n", optarg);
+						err = 1;
+				}
+				break;
+			case 'F':
+				fmt_idx |= SNDPIPE_FLOAT32;
+				break;
+			case 'c':
+				want.channels = atoi(optarg);
+				if(want.channels < 1)
+				{
+					fprintf(stderr, "Invalid channel count \
+%d\n", want.channels);
+					err = 1;
+				}
+				break;
+			case 's':
+				want.samples = atoi(optarg);
+				break;
+			case 'o':
+				fprintf(stderr, "\
+Ouptut file not implemented yet :'(\n");
+				break;
+			case 'N':
+				SILENT = 1;
+				break;
+			case 'h':
+				usage();
+				exit(0);
+			default:
+				/* ?? */
+				err = 1;
+
+		}
+	}
+
+	if(err)
+	{
+		usage();
+		exit(1);
+	}
+
+	if((fmt_idx & (SNDPIPE_BSZ_32 | SNDPIPE_SIGNED))\
+		== (SNDPIPE_BSZ_32| SNDPIPE_SIGNED))
+	{
+		fmt_idx &= 0xFF - SNDPIPE_SIGNED;
+	}
+	if(fmt_idx & SNDPIPE_FLOAT32)
+	{
+		if(!(fmt_idx & SNDPIPE_BSZ_32))
+		{
+			fprintf(stderr, "Floats only supported for 32 bits.\n\n");
+			usage();
+			exit(1);
+		}
+		fmt_idx &= 0xFF - SNDPIPE_FLOAT32;
+		fmt_idx |= 1; //correcting index for float32
+	}
+	if(fmt_idx & (SNDPIPE_ELSB | SNDPIPE_EMSB) \
+		&& !(fmt_idx & (SNDPIPE_BSZ_16 | SNDPIPE_BSZ_32)))
+	{
+		fprintf(stderr,
+			"Specifying endianness is not supported for 8-bit\n\n");
+		usage();
+		exit(1);
+	}
+	if(fmt_idx > 21)
+	{
+		fprintf(stderr, "Fatal error : invalid format\n\n");
+		exit(2);
+	}
+	if(err)
+	{
+		fprintf(stderr, "\n");
+		exit(1);
+	}
+	want.format = opt_fmt[fmt_idx];
+
+	if(!SILENT)
+	{
+		if(SDL_Init(SDL_INIT_AUDIO ) <0 )
+		{
+			fprintf(stderr,
+				"Unable to initialize SDL : '%s'\n", SDL_GetError());
+			return 1;
+		}
+
+		dev = SDL_OpenAudioDevice(NULL, 0, &want, &have, 0);
+		if(dev == 0)
+		{
+			fprintf(stderr,
+				"Failed to open an audio device : '%s'\n",
+				SDL_GetError());
+			return 1;
+		}
+	}
+	
+	if(!SILENT)
+	{
+		running = 1;
+		SDL_PauseAudioDevice(dev, 0); /* playing */
+		while(running)
+		{
+			SDL_Delay(1);
+		}
+		SDL_Quit();
+	}
+}