mirror of https://github.com/buserror/mii_emu.git
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/*
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* mii_speaker.h
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*
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* Copyright (C) 2023 Michel Pollet <buserror@gmail.com>
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*
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* SPDX-License-Identifier: MIT
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*/
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#pragma once
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#include <stdint.h>
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#define MII_SPEAKER_FREQ (44100)
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#define MII_SPEAKER_FRAME_COUNT 4
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struct mii_t;
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struct _snd_pcm;
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typedef int16_t mii_audio_sample_t;
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typedef struct mii_audio_frame_t {
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uint16_t fill;
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mii_audio_sample_t *audio;
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} mii_audio_frame_t;
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typedef struct mii_speaker_t {
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struct mii_t *mii;
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uint8_t timer_id; // timer id for the audio thread
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int debug_fd; // if > 0, dump audio to this fd
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struct _snd_pcm *alsa_pcm; // alsa pcm handle
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uint muted : 1; // if true, don't play anything
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uint speaker_off : 1; // if true, don't even initialize (alsa)
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float volume; // volume, 0.0 to 10.0
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float vol_multiplier; // sample multiplier, 0.0 to 1.0
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float cpu_speed; // CPU speed in MHz, to calculate clk_per_sample
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uint8_t under; // number of frames we've skipped
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uint8_t fplay; // frame we want to play
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uint16_t fsize; // size in samples of a frame
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uint8_t findex; // frame we are currently filling
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// number of cycles per sample (at current CPU speed)
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float clk_per_sample;
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mii_audio_sample_t sample; // current value for the speaker output
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mii_audio_frame_t frame[MII_SPEAKER_FRAME_COUNT];
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} mii_speaker_t;
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// Initialize the speaker with the frame size in samples
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void
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mii_speaker_init(
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struct mii_t * mii,
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mii_speaker_t *speaker);
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void
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mii_speaker_dispose(
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mii_speaker_t *speaker);
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// Called when $c030 is touched, place a sample at the 'appropriate' time
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void
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mii_speaker_click(
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mii_speaker_t *speaker);
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// Check to see if there's a new frame to send, send it
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//void
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//mii_speaker_run(
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// mii_speaker_t *speaker);
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// volume from 0 to 10, sets the audio sample multiplier.
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void
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mii_speaker_volume(
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mii_speaker_t *s,
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float volume);
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