Add a soundcard output via ALSA.

[nageru] / alsa_output.h

diff --git a/alsa_output.h b/alsa_output.h
new file mode 100644 (file)
index 0000000..12af16e
--- /dev/null
+++ b/alsa_output.h
@@ -0,0 +1,27 @@
+#ifndef _ALSA_OUTPUT_H
+#define _ALSA_OUTPUT_H 1
+
+// Extremely minimalistic ALSA output. Will not resample to fit
+// sound card clock, will not care much about over- or underflows
+// (so it will not block), will not care about A/V sync.
+//
+// This means that if you run it for long enough, clocks will
+// probably drift out of sync enough to make a little pop.
+
+#include <alsa/asoundlib.h>
+
+#include <vector>
+
+class ALSAOutput {
+public:
+       ALSAOutput(int sample_rate, int num_channels);
+       void write(const std::vector<float> &samples);
+
+private:
+       snd_pcm_t *pcm_handle;
+       std::vector<float> buffer;
+       snd_pcm_uframes_t period_size;
+       int num_channels;
+};
+
+#endif  // !defined(_ALSA_OUTPUT_H)