--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/render_audio.h	Fri May 17 08:43:30 2019 -0700
@@ -0,0 +1,57 @@
+#ifndef RENDER_AUDIO_H_
+#define RENDER_AUDIO_H_
+
+#include <stdint.h>
+typedef enum {
+	RENDER_AUDIO_S16,
+	RENDER_AUDIO_FLOAT,
+	RENDER_AUDIO_UNKNOWN
+} render_audio_format;
+
+typedef struct {
+	void     *opaque;
+	int16_t  *front;
+	int16_t  *back;
+	double   dt;
+	uint64_t buffer_fraction;
+	uint64_t buffer_inc;
+	float    gain_mult;
+	uint32_t buffer_pos;
+	uint32_t read_start;
+	uint32_t read_end;
+	uint32_t lowpass_alpha;
+	uint32_t mask;
+	int16_t  last_left;
+	int16_t  last_right;
+	uint8_t  num_channels;
+	uint8_t  front_populated;
+} audio_source;
+
+//public interface
+audio_source *render_audio_source(uint64_t master_clock, uint64_t sample_divider, uint8_t channels);
+void render_audio_source_gaindb(audio_source *src, float gain);
+void render_audio_adjust_clock(audio_source *src, uint64_t master_clock, uint64_t sample_divider);
+void render_put_mono_sample(audio_source *src, int16_t value);
+void render_put_stereo_sample(audio_source *src, int16_t left, int16_t right);
+void render_pause_source(audio_source *src);
+void render_resume_source(audio_source *src);
+void render_free_source(audio_source *src);
+//interface for render backends
+void render_audio_initialized(render_audio_format format, uint32_t rate, uint8_t channels, uint32_t buffer_size, int sample_size);
+int mix_and_convert(unsigned char *byte_stream, int len, int *min_remaining_out);
+uint8_t all_sources_ready(void);
+void render_audio_adjust_speed(float adjust_ratio);
+//to be implemented by render backend
+uint8_t render_is_audio_sync(void);
+void render_buffer_consumed(audio_source *src);
+void *render_new_audio_opaque(void);
+void render_free_audio_opaque(void *opaque);
+void render_lock_audio(void);
+void render_unlock_audio(void);
+uint32_t render_min_buffered(void);
+uint32_t render_audio_syncs_per_sec(void);
+void render_audio_created(audio_source *src);
+void render_do_audio_ready(audio_source *src);
+void render_source_paused(audio_source *src, uint8_t remaining_sources);
+void render_source_resumed(audio_source *src);
+#endif //RENDER_AUDIO_H_