Just simple tool to show the library usage.

2 files changed, 140 insertions, 0 deletions

diff --git a/app/unisono/CMakeLists.txt b/app/unisono/CMakeLists.txt
new file mode 100644
index 0000000..8a44354
--- /dev/null
+++ b/app/unisono/CMakeLists.txt
@@ -0,0 +1,28 @@
+cmake_minimum_required(VERSION 3.12)
+
+project(unisono)
+set (CMAKE_C_STANDARD 99)
+set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -fsanitize=address -fno-omit-frame-pointer")
+
+find_package(PkgConfig QUIET)
+if(PKG_CONFIG_FOUND)
+	pkg_check_modules(LIBSNDFILE_PKGCONF sndfile)
+endif(PKG_CONFIG_FOUND)
+
+find_path(LIBSNDFILE_INCLUDE_DIR
+	NAMES sndfile.h
+	PATHS ${LIBSNDFILE_PKGCONF_INCLUDE_DIRS}
+)
+
+find_library(LIBSNDFILE_LIBRARY
+	NAMES sndfile libsndfile-1
+	PATHS ${LIBSNDFILE_PKGCONF_LIBRARY_DIRS}
+)
+
+message(STATUS "sndfile include dirs path: ${LIBSNDFILE_INCLUDE_DIR}")
+message(STATUS "sndfile libs path: ${LIBSNDFILE_LIBRARY}")
+
+add_executable(unisono "main.c")
+include_directories(${LIBSNDFILE_INCLUDE_DIRS})
+target_link_libraries(unisono PRIVATE ${LIBSNDFILE_LIBRARY})
+
diff --git a/app/unisono/main.c b/app/unisono/main.c
new file mode 100644
index 0000000..4940962
--- /dev/null
+++ b/app/unisono/main.c
@@ -0,0 +1,112 @@
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sndfile.h>
+
+static void print_usage(const char* name)
+{
+	fprintf(stdout, "usage: %s\n", name);
+}
+
+#define BUFFER_LEN 16384
+
+static float in_data[BUFFER_LEN];
+static float out_data[BUFFER_LEN];
+
+///////////////////////////////////////////////////////////////////////////////
+
+void downmix(float* in, int len)
+{
+	int i, j;
+	// Downmix stereo to mono
+	for (i = 0, j = 0; i < len; i+=2, j++) {
+		in[j] = (in[i] + in[i + 1]) / 2.0;
+	}
+}
+
+void process(float *in, float *out, const SF_INFO *info, int len)
+{
+	int i;
+	// Call processing here
+	for (int i = 0; i < len / 2; i++) {
+		out[i * 2] = in[i];
+		out[i * 2 + 1] = -in[i];
+	}
+}
+
+int main(int argc, char** argv)
+{
+	const char* my_name = argv[0];
+	const char* in_file_nm = NULL;
+	const char* out_file_nm = NULL;
+	float shift = 0.0;
+	int ch;
+
+	SF_INFO sf_info;
+	SNDFILE *in_file, *out_file;
+	int read_channels;
+	int read_block_sz = BUFFER_LEN;
+	int read_count;
+
+	while ((ch = getopt(argc, argv, "f:i:")) != -1) {
+		switch (ch) {
+			case 'i':
+				in_file_nm = optarg;
+				break;
+			case 'f':
+				shift = atof(optarg);
+				break;
+			default:
+				print_usage(my_name);
+				return 1;
+		}
+	}
+
+	if (optind == argc) {
+		print_usage(my_name);
+		return 1;
+	}
+	out_file_nm = argv[optind];
+	fprintf(stderr, "input: %s -> %s, shift: %f hz\n", in_file_nm, out_file_nm, shift);
+
+	memset(&sf_info, 0, sizeof(sf_info));
+
+	if (!(in_file = sf_open(in_file_nm, SFM_READ, &sf_info))) {
+		printf ("Unable to open input file %s.\n", in_file_nm);
+		puts (sf_strerror (NULL));
+		return 1;
+	}
+
+	if (sf_info.channels > 2)
+	{
+		printf ("Expected stereo or mono input file") ;
+		sf_close (in_file);
+		return 1;
+	}
+
+	read_channels = sf_info.channels;
+	sf_info.format = SF_FORMAT_WAV | SF_FORMAT_PCM_16;
+	sf_info.channels = 2;
+
+	if (!(out_file = sf_open(out_file_nm, SFM_WRITE, &sf_info))) {
+		printf ("Unable to open output file %s.\n", out_file_nm);
+		puts (sf_strerror (NULL)) ;
+
+		sf_close(in_file);
+		return 1 ;
+	}
+
+
+	while ((read_count = (int)sf_readf_float(in_file, in_data, BUFFER_LEN / 2))) {
+		if (read_channels == 2)
+			downmix(in_data, BUFFER_LEN);
+		process(in_data, out_data, &sf_info, BUFFER_LEN);
+		sf_writef_float(out_file, out_data, read_count);
+	}
+
+	sf_close(in_file) ;
+	sf_close(out_file) ;
+
+	return 0;
+}