examples are smarter about device parameters

example/microphone.c

@@ -13,6 +13,28 @@
 #include <string.h>
 #include <math.h>
 
+static enum SoundIoFormat prioritized_formats[] = {
+    SoundIoFormatFloat32NE,
+    SoundIoFormatFloat32FE,
+    SoundIoFormatS32NE,
+    SoundIoFormatS32FE,
+    SoundIoFormatS24NE,
+    SoundIoFormatS24FE,
+    SoundIoFormatS16NE,
+    SoundIoFormatS16FE,
+    SoundIoFormatFloat64NE,
+    SoundIoFormatFloat64FE,
+    SoundIoFormatU32NE,
+    SoundIoFormatU32FE,
+    SoundIoFormatU24NE,
+    SoundIoFormatU24FE,
+    SoundIoFormatU16NE,
+    SoundIoFormatU16FE,
+    SoundIoFormatS8,
+    SoundIoFormatU8,
+    SoundIoFormatInvalid,
+};
+
 __attribute__ ((cold))
 __attribute__ ((noreturn))
 __attribute__ ((format (printf, 1, 2)))
@@ -75,11 +97,29 @@ int main(int argc, char **argv) {
     if (!layout)
         panic("channel layouts not compatible");
 
+
+    int sample_rate = 48000;
+    if (in_device->sample_rate_max < sample_rate) sample_rate = in_device->sample_rate_max;
+    if (out_device->sample_rate_max < sample_rate) sample_rate = out_device->sample_rate_max;
+    if (in_device->sample_rate_min > sample_rate || out_device->sample_rate_min > sample_rate)
+        panic("incompatible sample rates");
+
+    enum SoundIoFormat *fmt;
+    for (fmt = prioritized_formats; *fmt != SoundIoFormatInvalid; fmt += 1) {
+        if (soundio_device_supports_format(in_device, *fmt) &&
+            soundio_device_supports_format(out_device, *fmt))
+        {
+            break;
+        }
+    }
+    if (*fmt == SoundIoFormatInvalid)
+        panic("incompatible sample formats");
+
     struct SoundIoInStream *instream = soundio_instream_create(in_device);
     if (!instream)
         panic("out of memory");
-    instream->format = SoundIoFormatFloat32NE; // TODO pick compatible ones
-    instream->sample_rate = 48000; // TODO pick compatible ones
+    instream->format = *fmt;
+    instream->sample_rate = sample_rate;
     instream->layout = *layout;
     instream->latency = 0.1;
     instream->read_callback = read_callback;
@@ -90,8 +130,8 @@ int main(int argc, char **argv) {
     struct SoundIoOutStream *outstream = soundio_outstream_create(out_device);
     if (!outstream)
         panic("out of memory");
-    outstream->format = SoundIoFormatFloat32NE;
-    outstream->sample_rate = 48000;
+    outstream->format = *fmt;
+    outstream->sample_rate = sample_rate;
     outstream->layout = *layout;
     outstream->latency = 0.1;
     outstream->write_callback = write_callback;

example/sine.c

@@ -27,9 +27,9 @@ static void panic(const char *format, ...) {
 
 static const float PI = 3.1415926535f;
 static float seconds_offset = 0.0f;
+static int target_sample_rate = 48000;
 
 static void write_callback(struct SoundIoOutStream *outstream, int requested_frame_count) {
-    //device->bytes_per_frame;
     float float_sample_rate = outstream->sample_rate;
     float seconds_per_frame = 1.0f / float_sample_rate;
 
@@ -89,7 +89,8 @@ int main(int argc, char **argv) {
 
     struct SoundIoOutStream *outstream = soundio_outstream_create(device);
     outstream->format = SoundIoFormatFloat32NE;
-    outstream->sample_rate = 48000; // TODO let this be anything
+    outstream->sample_rate = (device->sample_rate_min <= target_sample_rate &&
+            target_sample_rate <= device->sample_rate_max) ? target_sample_rate : device->sample_rate_max;
     outstream->layout = device->layouts[0];
     outstream->latency = 0.1;
     outstream->write_callback = write_callback;

src/soundio.cpp

@@ -535,3 +535,11 @@ void soundio_sort_channel_layouts(struct SoundIoChannelLayout *layouts, int layo
 void soundio_device_sort_channel_layouts(struct SoundIoDevice *device) {
     soundio_sort_channel_layouts(device->layouts, device->layout_count);
 }
+
+bool soundio_device_supports_format(struct SoundIoDevice *device, enum SoundIoFormat format) {
+    for (int i = 0; i < device->format_count; i += 1) {
+        if (device->formats[i] == format)
+            return true;
+    }
+    return false;
+}

src/soundio.h

@@ -131,6 +131,9 @@ enum SoundIoFormat {
     SoundIoFormatFloat64BE,   // Float 64 bit Big Endian, Range -1.0 to 1.0
 };
 
+// For your convenience, Native Endian and Foreign Endian constants are defined
+// which point to the respective SoundIoFormat values.
+
 #if defined(SOUNDIO_OS_BIG_ENDIAN)
 #define SoundIoFormatS16NE SoundIoFormatS16BE
 #define SoundIoFormatU16NE SoundIoFormatU16BE
@@ -140,7 +143,18 @@ enum SoundIoFormat {
 #define SoundIoFormatU32NE SoundIoFormatU32BE
 #define SoundIoFormatFloat32NE SoundIoFormatFloat32BE
 #define SoundIoFormatFloat64NE SoundIoFormatFloat64BE
+
+#define SoundIoFormatS16FE SoundIoFormatS16LE
+#define SoundIoFormatU16FE SoundIoFormatU16LE
+#define SoundIoFormatS24FE SoundIoFormatS24LE
+#define SoundIoFormatU24FE SoundIoFormatU24LE
+#define SoundIoFormatS32FE SoundIoFormatS32LE
+#define SoundIoFormatU32FE SoundIoFormatU32LE
+#define SoundIoFormatFloat32FE SoundIoFormatFloat32LE
+#define SoundIoFormatFloat64FE SoundIoFormatFloat64LE
+
 #elif defined(SOUNDIO_OS_LITTLE_ENDIAN)
+
 #define SoundIoFormatS16NE SoundIoFormatS16LE
 #define SoundIoFormatU16NE SoundIoFormatU16LE
 #define SoundIoFormatS24NE SoundIoFormatS24LE
@@ -149,6 +163,16 @@ enum SoundIoFormat {
 #define SoundIoFormatU32NE SoundIoFormatU32LE
 #define SoundIoFormatFloat32NE SoundIoFormatFloat32LE
 #define SoundIoFormatFloat64NE SoundIoFormatFloat64LE
+
+#define SoundIoFormatS16FE SoundIoFormatS16BE
+#define SoundIoFormatU16FE SoundIoFormatU16BE
+#define SoundIoFormatS24FE SoundIoFormatS24BE
+#define SoundIoFormatU24FE SoundIoFormatU24BE
+#define SoundIoFormatS32FE SoundIoFormatS32BE
+#define SoundIoFormatU32FE SoundIoFormatU32BE
+#define SoundIoFormatFloat32FE SoundIoFormatFloat32BE
+#define SoundIoFormatFloat64FE SoundIoFormatFloat64BE
+
 #else
 #error unknown byte order
 #endif
@@ -388,6 +412,9 @@ enum SoundIoDevicePurpose soundio_device_purpose(const struct SoundIoDevice *dev
 // Sorts channel layouts by channel count, descending.
 void soundio_device_sort_channel_layouts(struct SoundIoDevice *device);
 
+// Returns whether `format` is included in the devices supported formats.
+bool soundio_device_supports_format(struct SoundIoDevice *device, enum SoundIoFormat format);
+
 
 
 // Output Streams