Working mpg123 + ao template to play sounds

csoundbox.c

@@ -0,0 +1,57 @@
+#include <ao/ao.h>
+#include <mpg123.h>
+
+#define BITS 8
+
+int main(int argc, char *argv[])
+{
+    mpg123_handle *mh;
+    unsigned char *buffer;
+    size_t buffer_size;
+    size_t done;
+    int err;
+
+    int driver;
+    ao_device *dev;
+
+    ao_sample_format format;
+    int channels, encoding;
+    long rate;
+
+    if(argc < 2)
+        exit(0);
+
+    /* initializations */
+    ao_initialize();
+    driver = ao_default_driver_id();
+    mpg123_init();
+    mh = mpg123_new(NULL, &err);
+    buffer_size = mpg123_outblock(mh);
+    buffer = (unsigned char*) malloc(buffer_size * sizeof(unsigned char));
+
+    /* open the file and get the decoding format */
+    mpg123_open(mh, argv[1]);
+    mpg123_getformat(mh, &rate, &channels, &encoding);
+
+    /* set the output format and open the output device */
+    format.bits = mpg123_encsize(encoding) * BITS;
+    format.rate = rate;
+    format.channels = channels;
+    format.byte_format = AO_FMT_NATIVE;
+    format.matrix = 0;
+    dev = ao_open_live(driver, &format, NULL);
+
+    /* decode and play */
+    while (mpg123_read(mh, buffer, buffer_size, &done) == MPG123_OK)
+        ao_play(dev, buffer, done);
+
+    /* clean up */
+    free(buffer);
+    ao_close(dev);
+    mpg123_close(mh);
+    mpg123_delete(mh);
+    mpg123_exit();
+    ao_shutdown();
+
+    return 0;
+}