00623d4eea
- Fixed a bug where low sampling rate or disabled sound resulted in wrong APU behavior. - Added API to get the current number of pending samples. - This change broke save state compatibility with v0.8 and older Closes #8.
79 lines
2.0 KiB
C
79 lines
2.0 KiB
C
#ifndef apu_h
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#define apu_h
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#include <stdbool.h>
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#include <stdint.h>
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#include "gb_struct_def.h"
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/* Divides nicely and never overflows with 4 channels */
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#define MAX_CH_AMP 0x1E00
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#define CH_STEP (0x1E00/0xF)
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typedef struct
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{
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int16_t left;
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int16_t right;
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} GB_sample_t;
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typedef struct
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{
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double left;
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double right;
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} GB_double_sample_t;
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/* Not all used on all channels */
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/* All lengths are in APU ticks */
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typedef struct
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{
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uint32_t phase;
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uint32_t wave_length;
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int32_t sound_length;
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bool stop_on_length;
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uint8_t duty;
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int16_t amplitude;
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int16_t start_amplitude;
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uint8_t envelope_steps;
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uint8_t cur_envelope_steps;
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int8_t envelope_direction;
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uint8_t sweep_steps;
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uint8_t cur_sweep_steps;
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int8_t sweep_direction;
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uint8_t sweep_shift;
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bool is_playing;
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uint16_t NRX3_X4_temp;
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bool left_on;
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bool right_on;
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} GB_apu_channel_t;
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typedef struct
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{
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uint16_t apu_cycles;
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bool global_enable;
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uint32_t envelope_step_timer;
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uint32_t sweep_step_timer;
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int8_t wave_form[32];
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uint8_t wave_shift;
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bool wave_enable;
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uint16_t lfsr;
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bool lfsr_7_bit;
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uint8_t left_volume;
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uint8_t right_volume;
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GB_apu_channel_t wave_channels[4];
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} GB_apu_t;
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void GB_set_sample_rate(GB_gameboy_t *gb, unsigned int sample_rate);
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/* Quality is the number of subsamples per sampling, for the sake of resampling.
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1 means on resampling at all, 0 is maximum quality. Default is 4. */
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void GB_set_audio_quality(GB_gameboy_t *gb, unsigned quality);
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void GB_apu_copy_buffer(GB_gameboy_t *gb, GB_sample_t *dest, unsigned int count);
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unsigned GB_apu_get_current_buffer_length(GB_gameboy_t *gb);
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#ifdef GB_INTERNAL
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void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value);
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uint8_t GB_apu_read(GB_gameboy_t *gb, uint8_t reg);
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void GB_apu_get_samples_and_update_pcm_regs(GB_gameboy_t *gb, GB_sample_t *samples);
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void GB_apu_init(GB_gameboy_t *gb);
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void GB_apu_run(GB_gameboy_t *gb);
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#endif
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#endif /* apu_h */
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