Add libsamplerate for resampling decoder output

1 files changed, 149 insertions, 0 deletions

diff --git a/lib/libsamplerate/libsamplerate-0.2.2/tests/streaming_test.c b/lib/libsamplerate/libsamplerate-0.2.2/tests/streaming_test.c
new file mode 100755
index 00000000..45ad2516
--- /dev/null
+++ b/lib/libsamplerate/libsamplerate-0.2.2/tests/streaming_test.c
@@ -0,0 +1,149 @@
+/*
+** 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/libsndfile/libsamplerate/blob/master/COPYING
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+
+#include <samplerate.h>
+
+#include "util.h"
+
+#define	BUFFER_LEN		(1<<15)
+
+#define BLOCK_LEN		100
+
+static void stream_test (int converter, double ratio) ;
+
+int
+main (void)
+{	static double src_ratios [] =
+	{	0.3, 0.9, 1.1, 3.0
+	} ;
+
+	int k ;
+
+	puts ("\n    Zero Order Hold interpolator:") ;
+	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++)
+		stream_test (SRC_LINEAR, src_ratios [k]) ;
+
+	puts ("\n    Sinc interpolator:") ;
+	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
+		stream_test (SRC_SINC_FASTEST, src_ratios [k]) ;
+
+	puts ("") ;
+
+	return 0 ;
+} /* main */
+
+static void
+stream_test (int converter, double src_ratio)
+{	static float input [BUFFER_LEN], output [BUFFER_LEN] ;
+
+	SRC_STATE	*src_state ;
+	SRC_DATA	src_data ;
+
+	int input_len, output_len, current_in, current_out ;
+	int error, terminate ;
+
+	printf ("\tstreaming_test   (SRC ratio = %6.4f) ........... ", src_ratio) ;
+	fflush (stdout) ;
+
+	/* Calculate maximun input and output lengths. */
+	if (src_ratio >= 1.0)
+	{	output_len = BUFFER_LEN ;
+		input_len = (int) floor (BUFFER_LEN / src_ratio) ;
+		}
+	else
+	{	input_len = BUFFER_LEN ;
+		output_len = (int) floor (BUFFER_LEN * src_ratio) ;
+		} ;
+
+	/* Reduce input_len by 10 so output is longer than necessary. */
+	input_len -= 10 ;
+
+	if (output_len > BUFFER_LEN)
+	{	printf ("\n\nLine %d : output_len > 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.input_frames = BLOCK_LEN ;
+
+	src_data.src_ratio = src_ratio ;
+
+	src_data.data_out = output ;
+	src_data.output_frames = BLOCK_LEN ;
+
+	while (1)
+	{	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", src_data.output_frames) ;
+
+			exit (1) ;
+			} ;
+
+		if (src_data.end_of_input && src_data.output_frames_gen == 0)
+			break ;
+
+		current_in	+= src_data.input_frames_used ;
+		current_out += src_data.output_frames_gen ;
+
+		src_data.data_in	+= src_data.input_frames_used ;
+		src_data.data_out	+= src_data.output_frames_gen ;
+
+		src_data.input_frames	= MIN (BLOCK_LEN, input_len - current_in) ;
+		src_data.output_frames	= MIN (BLOCK_LEN, output_len - current_out) ;
+
+		src_data.end_of_input = (current_in >= input_len) ? 1 : 0 ;
+		} ;
+
+	src_state = src_delete (src_state) ;
+
+	terminate = (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ;
+
+	if (fabs (current_out - src_ratio * input_len) > 2 * terminate)
+	{	printf ("\n\nLine %d : bad output data length %d should be %d.\n", __LINE__,
+					current_out, (int) floor (src_ratio * input_len)) ;
+		printf ("\tsrc_ratio  : %.4f\n", src_ratio) ;
+		printf ("\tinput_len  : %d\n\toutput_len : %d\n\n", input_len, output_len) ;
+		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 */
+