Implement xas_audio_format_mono()

Implement xas_audio_format_mono() to return a new audio format
descriptor for a given input, but in mono, as a convenience

2 files changed, 10 insertions, 0 deletions

diff --git a/include/xas/audio.h b/include/xas/audio.h
index 343986d..76d38ce 100644
--- a/include/xas/audio.h
+++ b/include/xas/audio.h
@@ -53,6 +53,8 @@ struct _xas_audio_stream {
 
 int xas_audio_format_eq(xas_audio_format a, xas_audio_format b);
 
+xas_audio_format xas_audio_format_mono(xas_audio_format format);
+
 void xas_audio_zero(xas_audio_format format,
                       void *dest,
                       size_t index,
diff --git a/src/audio.c b/src/audio.c
index aedc4c0..95c727e 100644
--- a/src/audio.c
+++ b/src/audio.c
@@ -11,6 +11,14 @@ int xas_audio_format_eq(xas_audio_format a, xas_audio_format b) {
         && a.sample_rate == b.sample_rate;
 }
 
+xas_audio_format xas_audio_format_mono(xas_audio_format format) {
+    return (xas_audio_format){
+        .channels    = XAS_AUDIO_MONO,
+        .sample_size = format.sample_size,
+        .sample_rate = format.sample_rate
+    };
+}
+
 void xas_audio_zero(xas_audio_format format,
                       void *dest,
                       size_t index,