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#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_
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