[audio-libsamplerate.git] / libsamplerate / tests / termination_test.c

/*
** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
*/

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#include <samplerate.h>

#include "util.h"

#define	SHORT_BUFFER_LEN	2048
#define	LONG_BUFFER_LEN		((1 << 16) - 20)

static void simple_test (int converter) ;
static void stream_test (int converter, double ratio) ;
static void init_term_test (int converter, double ratio) ;

static int	next_block_length (int reset) ;

int
main (void)
{	static double src_ratios [] =
	{	0.999900, 1.000100, 0.789012, 1.200000, 0.333333, 3.100000,
		0.125000, 8.000000, 0.099900, 9.990000, 0.100000, 10.00000
	} ;

	int k ;

	puts ("\n    Zero Order Hold interpolator:") ;

	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
		init_term_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;
	puts ("") ;
	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
		stream_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;


	puts ("\n    Linear interpolator:") ;
	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
		init_term_test (SRC_LINEAR, src_ratios [k]) ;
	puts ("") ;
	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
		stream_test (SRC_LINEAR, src_ratios [k]) ;


	puts ("\n    Sinc interpolator:") ;
	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
		init_term_test (SRC_SINC_FASTEST, src_ratios [k]) ;
	puts ("") ;
	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
		stream_test (SRC_SINC_FASTEST, src_ratios [k]) ;

	puts ("") ;

	simple_test (SRC_SINC_FASTEST) ;

	return 0 ;
} /* main */

static void
simple_test (int converter)
{
	int ilen = 199030, olen = 1000, error ;

	{
		float in [ilen] ;
		float out [olen] ;
		double ratio = (1.0 * olen) / ilen ;
		SRC_DATA src_data =
		{	in, out,
			ilen, olen,
			0, 0, 0,
			ratio
		} ;

		error = src_simple (&src_data, converter, 1) ;
		if (error)
		{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
			exit (1) ;
			} ;
	} ;

    return ;
} /* simple_test */

static void
init_term_test (int converter, double src_ratio)
{	static float input [SHORT_BUFFER_LEN], output [SHORT_BUFFER_LEN] ;

	SRC_DATA	src_data ;

	int k, input_len, output_len, error, terminate ;

	printf ("\tinit_term_test   (SRC ratio = %7.4f) .......... ", src_ratio) ;
	fflush (stdout) ;

	/* Calculate maximun input and output lengths. */
	if (src_ratio >= 1.0)
	{	output_len = SHORT_BUFFER_LEN ;
		input_len = (int) floor (SHORT_BUFFER_LEN / src_ratio) ;
		}
	else
	{	input_len = SHORT_BUFFER_LEN ;
		output_len = (int) floor (SHORT_BUFFER_LEN * src_ratio) ;
		} ;

	/* Reduce input_len by 10 so output is longer than necessary. */
	input_len -= 10 ;

	for (k = 0 ; k < ARRAY_LEN (input) ; k++)
		input [k] = 1.0 ;

	if (output_len > SHORT_BUFFER_LEN)
	{	printf ("\n\nLine %d : output_len > SHORT_BUFFER_LEN\n\n", __LINE__) ;
		exit (1) ;
		} ;

	src_data.data_in = input ;
	src_data.input_frames = input_len ;

	src_data.src_ratio = src_ratio ;

	src_data.data_out = output ;
	src_data.output_frames = SHORT_BUFFER_LEN ;

	if ((error = src_simple (&src_data, converter, 1)))
	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
		exit (1) ;
		} ;

	terminate = (int) ceil ((src_ratio >= 1.0) ? 1 : 1.0 / src_ratio) ;

	if (fabs (src_ratio * input_len - src_data.output_frames_gen) > terminate)
	{	printf ("\n\nLine %d : Bad output frame count.\n\n", __LINE__) ;
		printf ("\tterminate             : %d\n", terminate) ;
		printf ("\tsrc_ratio             : %.4f\n", src_ratio) ;
		printf ("\tinput_len             : %d\n"
				"\tinput_len * src_ratio : %f\n", input_len, input_len * src_ratio) ;
		printf ("\toutput_frames_gen     : %ld\n\n", src_data.output_frames_gen) ;
		exit (1) ;
		} ;

	if (labs (src_data.input_frames_used - input_len) > 1)
	{	printf ("\n\nLine %d : input_frames_used should be %d, is %ld.\n\n",
					 __LINE__, input_len, src_data.input_frames_used) ;
		printf ("\tsrc_ratio  : %.4f\n", src_ratio) ;
		printf ("\tinput_len  : %d\n\tinput_used : %ld\n\n", input_len, src_data.input_frames_used) ;
		exit (1) ;
		} ;

	if (fabs (output [0]) < 0.1)
	{	printf ("\n\nLine %d : First output sample is bad.\n\n", __LINE__) ;
		printf ("\toutput [0] == %f\n\n", output [0]) ;
		exit (1) ;
		}

	puts ("ok") ;

	return ;
} /* init_term_test */

static void
stream_test (int converter, double src_ratio)
{	static float input [LONG_BUFFER_LEN], output [LONG_BUFFER_LEN] ;

	SRC_STATE	*src_state ;
	SRC_DATA	src_data ;

	int input_len, output_len, current_in, current_out ;
	int k, error, terminate ;

	printf ("\tstream_test      (SRC ratio = %7.4f) .......... ", src_ratio) ;
	fflush (stdout) ;

/* Erik */
for (k = 0 ; k < LONG_BUFFER_LEN ; k++) input [k] = k * 1.0 ;

	/* Calculate maximun input and output lengths. */
	if (src_ratio >= 1.0)
	{	output_len = LONG_BUFFER_LEN ;
		input_len = (int) floor (LONG_BUFFER_LEN / src_ratio) ;
		}
	else
	{	input_len = LONG_BUFFER_LEN ;
		output_len = (int) floor (LONG_BUFFER_LEN * src_ratio) ;
		} ;

	/* Reduce input_len by 10 so output is longer than necessary. */
	input_len -= 20 ;

	if (output_len > LONG_BUFFER_LEN)
	{	printf ("\n\nLine %d : output_len > LONG_BUFFER_LEN\n\n", __LINE__) ;
		exit (1) ;
		} ;

	current_in = current_out = 0 ;

	/* Perform sample rate conversion. */
	if ((src_state = src_new (converter, 1, &error)) == NULL)
	{	printf ("\n\nLine %d : src_new() failed : %s\n\n", __LINE__, src_strerror (error)) ;
		exit (1) ;
		} ;

	src_data.end_of_input = 0 ; /* Set this later. */

	src_data.data_in = input ;

	src_data.src_ratio = src_ratio ;

	src_data.data_out = output ;
	src_data.output_frames = ARRAY_LEN (output) / 10 ;

	terminate = 1 + (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ;

	while (1)
	{
		src_data.input_frames = next_block_length (0) ;
		src_data.input_frames = MIN (src_data.input_frames, input_len - current_in) ;

		src_data.output_frames = ARRAY_LEN (output) - current_out ;
		/*-Erik MIN (src_data.output_frames, output_len - current_out) ;-*/

		src_data.end_of_input = (current_in >= input_len) ? 1 : 0 ;

		if ((error = src_process (src_state, &src_data)))
		{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
			printf ("  src_data.input_frames  : %ld\n", src_data.input_frames) ;
			printf ("  src_data.output_frames : %ld\n\n", src_data.output_frames) ;
			exit (1) ;
			} ;

		if (src_data.end_of_input && src_data.output_frames_gen == 0)
			break ;

		if (src_data.input_frames_used > src_data.input_frames)
		{	printf ("\n\nLine %d : input_frames_used > input_frames\n\n", __LINE__) ;
			printf ("  src_data.input_frames      : %ld\n", src_data.input_frames) ;
			printf ("  src_data.input_frames_used : %ld\n", src_data.input_frames_used) ;
			printf ("  src_data.output_frames     : %ld\n", src_data.output_frames) ;
			printf ("  src_data.output_frames_gen : %ld\n\n", src_data.output_frames_gen) ;
			exit (1) ;
			} ;

		if (src_data.input_frames_used < 0)
		{	printf ("\n\nLine %d : input_frames_used (%ld) < 0\n\n", __LINE__, src_data.input_frames_used) ;
			exit (1) ;
			} ;

		if (src_data.output_frames_gen < 0)
		{	printf ("\n\nLine %d : output_frames_gen (%ld) < 0\n\n", __LINE__, src_data.output_frames_gen) ;
			exit (1) ;
			} ;

		current_in	+= src_data.input_frames_used ;
		current_out += src_data.output_frames_gen ;

		if (current_in > input_len + terminate)
		{	printf ("\n\nLine %d : current_in (%d) > input_len (%d + %d)\n\n", __LINE__, current_in, input_len, terminate) ;
			exit (1) ;
			} ;

		if (current_out > output_len)
		{	printf ("\n\nLine %d : current_out (%d) > output_len (%d)\n\n", __LINE__, current_out, output_len) ;
			exit (1) ;
			} ;

		if (src_data.input_frames_used > input_len)
		{	printf ("\n\nLine %d : input_frames_used (%ld) > %d\n\n", __LINE__, src_data.input_frames_used, input_len) ;
			exit (1) ;
			} ;

		if (src_data.output_frames_gen > output_len)
		{	printf ("\n\nLine %d : output_frames_gen (%ld) > %d\n\n", __LINE__, src_data.output_frames_gen, output_len) ;
			exit (1) ;
			} ;

		if (src_data.data_in == NULL && src_data.output_frames_gen == 0)
			break ;


		src_data.data_in	+= src_data.input_frames_used ;
		src_data.data_out	+= src_data.output_frames_gen ;
		} ;

	src_state = src_delete (src_state) ;

	if (fabs (current_out - src_ratio * input_len) > terminate)
	{	printf ("\n\nLine %d : bad output data length %d should be %2.1f +/- %d.\n", __LINE__,
					current_out, src_ratio * input_len, terminate) ;
		printf ("\tsrc_ratio  : %.4f\n", src_ratio) ;
		printf ("\tinput_len  : %d\n\tinput_used : %d\n", input_len, current_in) ;
		printf ("\toutput_len : %d\n\toutput_gen : %d\n\n", output_len, current_out) ;
		exit (1) ;
		} ;

	if (current_in != input_len)
	{	printf ("\n\nLine %d : unused input.\n", __LINE__) ;
		printf ("\tinput_len         : %d\n", input_len) ;
		printf ("\tinput_frames_used : %d\n\n", current_in) ;
		exit (1) ;
		} ;

	puts ("ok") ;

	return ;
} /* stream_test */

static int
next_block_length (int reset)
{	static int block_lengths [] = /* Should be an odd length. */
	{	/*-2, 500, 5, 400, 10, 300, 20, 200, 50, 100, 70 -*/
		5, 400, 10, 300, 20, 200, 50, 100, 70
		} ;
	static int block_len_index = 0 ;

	if (reset)
		block_len_index = 0 ;
	else
		block_len_index = (block_len_index + 1) % ARRAY_LEN (block_lengths) ;

	return block_lengths [block_len_index] ;
} /* next_block_length */
Commit	Line	Data
8529da43 MG	1	/*
	2	** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
	3	** All rights reserved.
	4	**
	5	** This code is released under 2-clause BSD license. Please see the
	6	** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
	7	*/
	8
	9	#include <stdio.h>
	10	#include <stdlib.h>
	11	#include <math.h>
	12
	13	#include <samplerate.h>
	14
	15	#include "util.h"
	16
	17	#define SHORT_BUFFER_LEN 2048
	18	#define LONG_BUFFER_LEN ((1 << 16) - 20)
	19
	20	static void simple_test (int converter) ;
	21	static void stream_test (int converter, double ratio) ;
	22	static void init_term_test (int converter, double ratio) ;
	23
	24	static int next_block_length (int reset) ;
	25
	26	int
	27	main (void)
	28	{ static double src_ratios [] =
	29	{ 0.999900, 1.000100, 0.789012, 1.200000, 0.333333, 3.100000,
	30	0.125000, 8.000000, 0.099900, 9.990000, 0.100000, 10.00000
	31	} ;
	32
	33	int k ;
	34
	35	puts ("\n Zero Order Hold interpolator:") ;
	36
	37	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
	38	init_term_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;
	39	puts ("") ;
	40	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
	41	stream_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;
	42
	43
	44	puts ("\n Linear interpolator:") ;
	45	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
	46	init_term_test (SRC_LINEAR, src_ratios [k]) ;
	47	puts ("") ;
	48	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
	49	stream_test (SRC_LINEAR, src_ratios [k]) ;
	50
	51
	52	puts ("\n Sinc interpolator:") ;
	53	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
	54	init_term_test (SRC_SINC_FASTEST, src_ratios [k]) ;
	55	puts ("") ;
	56	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
	57	stream_test (SRC_SINC_FASTEST, src_ratios [k]) ;
	58
	59	puts ("") ;
	60
	61	simple_test (SRC_SINC_FASTEST) ;
	62
	63	return 0 ;
	64	} /* main */
65
66	static void
67	simple_test (int converter)
68	{
69	int ilen = 199030, olen = 1000, error ;
70
71	{
72	float in [ilen] ;
73	float out [olen] ;
74	double ratio = (1.0 * olen) / ilen ;
75	SRC_DATA src_data =
76	{ in, out,
77	ilen, olen,
78	0, 0, 0,
79	ratio
80	} ;
81
82	error = src_simple (&src_data, converter, 1) ;
83	if (error)
84	{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
85	exit (1) ;
86	} ;
87	} ;
88
89	return ;
90	} /* simple_test */
91
92	static void
93	init_term_test (int converter, double src_ratio)
94	{ static float input [SHORT_BUFFER_LEN], output [SHORT_BUFFER_LEN] ;
95
96	SRC_DATA src_data ;
97
98	int k, input_len, output_len, error, terminate ;
99
100	printf ("\tinit_term_test (SRC ratio = %7.4f) .......... ", src_ratio) ;
101	fflush (stdout) ;
102
103	/* Calculate maximun input and output lengths. */
104	if (src_ratio >= 1.0)
105	{ output_len = SHORT_BUFFER_LEN ;
106	input_len = (int) floor (SHORT_BUFFER_LEN / src_ratio) ;
107	}
108	else
109	{ input_len = SHORT_BUFFER_LEN ;
110	output_len = (int) floor (SHORT_BUFFER_LEN * src_ratio) ;
111	} ;
112
113	/* Reduce input_len by 10 so output is longer than necessary. */
114	input_len -= 10 ;
115
116	for (k = 0 ; k < ARRAY_LEN (input) ; k++)
117	input [k] = 1.0 ;
118
119	if (output_len > SHORT_BUFFER_LEN)
120	{ printf ("\n\nLine %d : output_len > SHORT_BUFFER_LEN\n\n", __LINE__) ;
121	exit (1) ;
122	} ;
123
124	src_data.data_in = input ;
125	src_data.input_frames = input_len ;
126
127	src_data.src_ratio = src_ratio ;
128
129	src_data.data_out = output ;
130	src_data.output_frames = SHORT_BUFFER_LEN ;
131
132	if ((error = src_simple (&src_data, converter, 1)))
133	{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
134	exit (1) ;
135	} ;
136
137	terminate = (int) ceil ((src_ratio >= 1.0) ? 1 : 1.0 / src_ratio) ;
138
139	if (fabs (src_ratio * input_len - src_data.output_frames_gen) > terminate)
140	{ printf ("\n\nLine %d : Bad output frame count.\n\n", __LINE__) ;
141	printf ("\tterminate : %d\n", terminate) ;
142	printf ("\tsrc_ratio : %.4f\n", src_ratio) ;
143	printf ("\tinput_len : %d\n"
144	"\tinput_len * src_ratio : %f\n", input_len, input_len * src_ratio) ;
145	printf ("\toutput_frames_gen : %ld\n\n", src_data.output_frames_gen) ;
146	exit (1) ;
147	} ;
148
149	if (labs (src_data.input_frames_used - input_len) > 1)
150	{ printf ("\n\nLine %d : input_frames_used should be %d, is %ld.\n\n",
151	__LINE__, input_len, src_data.input_frames_used) ;
152	printf ("\tsrc_ratio : %.4f\n", src_ratio) ;
153	printf ("\tinput_len : %d\n\tinput_used : %ld\n\n", input_len, src_data.input_frames_used) ;
154	exit (1) ;
155	} ;
156
157	if (fabs (output [0]) < 0.1)
158	{ printf ("\n\nLine %d : First output sample is bad.\n\n", __LINE__) ;
159	printf ("\toutput [0] == %f\n\n", output [0]) ;
160	exit (1) ;
161	}
162
163	puts ("ok") ;
164
165	return ;
166	} /* init_term_test */
167
168	static void
169	stream_test (int converter, double src_ratio)
170	{ static float input [LONG_BUFFER_LEN], output [LONG_BUFFER_LEN] ;
171
172	SRC_STATE *src_state ;
173	SRC_DATA src_data ;
174
175	int input_len, output_len, current_in, current_out ;
176	int k, error, terminate ;
177
178	printf ("\tstream_test (SRC ratio = %7.4f) .......... ", src_ratio) ;
179	fflush (stdout) ;
180
181	/* Erik */
182	for (k = 0 ; k < LONG_BUFFER_LEN ; k++) input [k] = k * 1.0 ;
183
184	/* Calculate maximun input and output lengths. */
185	if (src_ratio >= 1.0)
186	{ output_len = LONG_BUFFER_LEN ;
187	input_len = (int) floor (LONG_BUFFER_LEN / src_ratio) ;
188	}
189	else
190	{ input_len = LONG_BUFFER_LEN ;
191	output_len = (int) floor (LONG_BUFFER_LEN * src_ratio) ;
192	} ;
193
194	/* Reduce input_len by 10 so output is longer than necessary. */
195	input_len -= 20 ;
196
197	if (output_len > LONG_BUFFER_LEN)
198	{ printf ("\n\nLine %d : output_len > LONG_BUFFER_LEN\n\n", __LINE__) ;
199	exit (1) ;
200	} ;
201
202	current_in = current_out = 0 ;
203
204	/* Perform sample rate conversion. */
205	if ((src_state = src_new (converter, 1, &error)) == NULL)
206	{ printf ("\n\nLine %d : src_new() failed : %s\n\n", __LINE__, src_strerror (error)) ;
207	exit (1) ;
208	} ;
209
210	src_data.end_of_input = 0 ; /* Set this later. */
211
212	src_data.data_in = input ;
213
214	src_data.src_ratio = src_ratio ;
215
216	src_data.data_out = output ;
217	src_data.output_frames = ARRAY_LEN (output) / 10 ;
218
219	terminate = 1 + (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ;
220
221	while (1)
222	{
223	src_data.input_frames = next_block_length (0) ;
224	src_data.input_frames = MIN (src_data.input_frames, input_len - current_in) ;
225
226	src_data.output_frames = ARRAY_LEN (output) - current_out ;
227	/-Erik MIN (src_data.output_frames, output_len - current_out) ;-/
228
229	src_data.end_of_input = (current_in >= input_len) ? 1 : 0 ;
230
231	if ((error = src_process (src_state, &src_data)))
232	{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
233	printf (" src_data.input_frames : %ld\n", src_data.input_frames) ;
234	printf (" src_data.output_frames : %ld\n\n", src_data.output_frames) ;
235	exit (1) ;
236	} ;
237
238	if (src_data.end_of_input && src_data.output_frames_gen == 0)
239	break ;
240
241	if (src_data.input_frames_used > src_data.input_frames)
242	{ printf ("\n\nLine %d : input_frames_used > input_frames\n\n", __LINE__) ;
243	printf (" src_data.input_frames : %ld\n", src_data.input_frames) ;
244	printf (" src_data.input_frames_used : %ld\n", src_data.input_frames_used) ;
245	printf (" src_data.output_frames : %ld\n", src_data.output_frames) ;
246	printf (" src_data.output_frames_gen : %ld\n\n", src_data.output_frames_gen) ;
247	exit (1) ;
248	} ;
249
250	if (src_data.input_frames_used < 0)
251	{ printf ("\n\nLine %d : input_frames_used (%ld) < 0\n\n", __LINE__, src_data.input_frames_used) ;
252	exit (1) ;
253	} ;
254
255	if (src_data.output_frames_gen < 0)
256	{ printf ("\n\nLine %d : output_frames_gen (%ld) < 0\n\n", __LINE__, src_data.output_frames_gen) ;
257	exit (1) ;
258	} ;
259
260	current_in += src_data.input_frames_used ;
261	current_out += src_data.output_frames_gen ;
262
263	if (current_in > input_len + terminate)
264	{ printf ("\n\nLine %d : current_in (%d) > input_len (%d + %d)\n\n", __LINE__, current_in, input_len, terminate) ;
265	exit (1) ;
266	} ;
267
268	if (current_out > output_len)
269	{ printf ("\n\nLine %d : current_out (%d) > output_len (%d)\n\n", __LINE__, current_out, output_len) ;
270	exit (1) ;
271	} ;
272
273	if (src_data.input_frames_used > input_len)
274	{ printf ("\n\nLine %d : input_frames_used (%ld) > %d\n\n", __LINE__, src_data.input_frames_used, input_len) ;
275	exit (1) ;
276	} ;
277
278	if (src_data.output_frames_gen > output_len)
279	{ printf ("\n\nLine %d : output_frames_gen (%ld) > %d\n\n", __LINE__, src_data.output_frames_gen, output_len) ;
280	exit (1) ;
281	} ;
282
283	if (src_data.data_in == NULL && src_data.output_frames_gen == 0)
284	break ;
285
286
287	src_data.data_in += src_data.input_frames_used ;
288	src_data.data_out += src_data.output_frames_gen ;
289	} ;
290
291	src_state = src_delete (src_state) ;
292
293	if (fabs (current_out - src_ratio * input_len) > terminate)
294	{ printf ("\n\nLine %d : bad output data length %d should be %2.1f +/- %d.\n", __LINE__,
295	current_out, src_ratio * input_len, terminate) ;
296	printf ("\tsrc_ratio : %.4f\n", src_ratio) ;
297	printf ("\tinput_len : %d\n\tinput_used : %d\n", input_len, current_in) ;
298	printf ("\toutput_len : %d\n\toutput_gen : %d\n\n", output_len, current_out) ;
299	exit (1) ;
300	} ;
301
302	if (current_in != input_len)
303	{ printf ("\n\nLine %d : unused input.\n", __LINE__) ;
304	printf ("\tinput_len : %d\n", input_len) ;
305	printf ("\tinput_frames_used : %d\n\n", current_in) ;
306	exit (1) ;
307	} ;
308
309	puts ("ok") ;
310
311	return ;
312	} /* stream_test */
313
314	static int
315	next_block_length (int reset)
316	{ static int block_lengths [] = /* Should be an odd length. */
317	{ /-2, 500, 5, 400, 10, 300, 20, 200, 50, 100, 70 -/
318	5, 400, 10, 300, 20, 200, 50, 100, 70
319	} ;
320	static int block_len_index = 0 ;
321
322	if (reset)
323	block_len_index = 0 ;
324	else
325	block_len_index = (block_len_index + 1) % ARRAY_LEN (block_lengths) ;
326
327	return block_lengths [block_len_index] ;
328	} /* next_block_length */
329