1 files changed, 48 insertions, 0 deletions
diff --git a/src/oss.c b/src/oss.c
new file mode 100644
index 00000000..7b1315c0
--- /dev/null
+++ b/src/oss.c
@@ -0,0 +1,48 @@
+#include <assert.h>
+#include <sys/soundcard.h>
+#include <sys/ioctl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#include "oss.h"
+
+int oss_auto_format(int fd, struct sample_spec *ss) {
+    int format, channels, speed;
+
+    assert(fd >= 0 && ss);
+    
+    format = AFMT_S16_NE;
+    if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_S16_NE) {
+        int f = AFMT_S16_NE == AFMT_S16_LE ? AFMT_S16_BE : AFMT_S16_LE;
+        format = f;
+        if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != f) {
+            format = AFMT_U8;
+            if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_U8) {
+                fprintf(stderr, "SNDCTL_DSP_SETFMT: %s\n", format != AFMT_U8 ? "No supported sample format" : strerror(errno));
+                return -1;
+            } else
+                ss->format = SAMPLE_U8;
+        } else
+            ss->format = f == AFMT_S16_LE ? SAMPLE_S16LE : SAMPLE_S16BE;
+    } else
+        ss->format = SAMPLE_S16NE;
+        
+    channels = 2;
+    if (ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) < 0) {
+        fprintf(stderr, "SNDCTL_DSP_CHANNELS: %s\n", strerror(errno));
+        return -1;
+    }
+    assert(channels);
+    ss->channels = channels;
+
+    speed = 44100;
+    if (ioctl(fd, SNDCTL_DSP_SPEED, &speed) < 0) {
+        fprintf(stderr, "SNDCTL_DSP_SPEED: %s\n", strerror(errno));
+        return -1;
+    }
+    assert(speed);
+    ss->rate = speed;
+
+    return 0;
+}