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annotate render_audio.h @ 1971:80920c21bb52

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Add an event log soft flush and call it twice per frame in between hard flushes to netplay latency when there are insufficient hardware updates to flush packets in the middle of a frame
author Michael Pavone <pavone@retrodev.com>
date Fri, 08 May 2020 11:40:30 -0700
parents 4c322abd9fa5
children cfd53c94fffb
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4c322abd9fa5 Split generic part of audio code into a separate file so it can be used in other targets besides SDL
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1 #ifndef RENDER_AUDIO_H_
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2 #define RENDER_AUDIO_H_
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3
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4 #include <stdint.h>
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5 typedef enum {
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6 RENDER_AUDIO_S16,
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7 RENDER_AUDIO_FLOAT,
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8 RENDER_AUDIO_UNKNOWN
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9 } render_audio_format;
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10
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11 typedef struct {
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12 void *opaque;
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13 int16_t *front;
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14 int16_t *back;
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15 double dt;
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16 uint64_t buffer_fraction;
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17 uint64_t buffer_inc;
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18 float gain_mult;
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19 uint32_t buffer_pos;
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20 uint32_t read_start;
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21 uint32_t read_end;
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22 uint32_t lowpass_alpha;
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23 uint32_t mask;
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24 int16_t last_left;
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25 int16_t last_right;
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26 uint8_t num_channels;
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27 uint8_t front_populated;
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28 } audio_source;
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29
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30 //public interface
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31 audio_source *render_audio_source(uint64_t master_clock, uint64_t sample_divider, uint8_t channels);
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32 void render_audio_source_gaindb(audio_source *src, float gain);
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33 void render_audio_adjust_clock(audio_source *src, uint64_t master_clock, uint64_t sample_divider);
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34 void render_put_mono_sample(audio_source *src, int16_t value);
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35 void render_put_stereo_sample(audio_source *src, int16_t left, int16_t right);
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36 void render_pause_source(audio_source *src);
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37 void render_resume_source(audio_source *src);
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38 void render_free_source(audio_source *src);
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39 //interface for render backends
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40 void render_audio_initialized(render_audio_format format, uint32_t rate, uint8_t channels, uint32_t buffer_size, int sample_size);
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41 int mix_and_convert(unsigned char *byte_stream, int len, int *min_remaining_out);
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42 uint8_t all_sources_ready(void);
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43 void render_audio_adjust_speed(float adjust_ratio);
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44 //to be implemented by render backend
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45 uint8_t render_is_audio_sync(void);
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46 void render_buffer_consumed(audio_source *src);
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47 void *render_new_audio_opaque(void);
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48 void render_free_audio_opaque(void *opaque);
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49 void render_lock_audio(void);
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50 void render_unlock_audio(void);
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51 uint32_t render_min_buffered(void);
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52 uint32_t render_audio_syncs_per_sec(void);
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53 void render_audio_created(audio_source *src);
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54 void render_do_audio_ready(audio_source *src);
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55 void render_source_paused(audio_source *src, uint8_t remaining_sources);
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56 void render_source_resumed(audio_source *src);
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57 #endif //RENDER_AUDIO_H_