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https://github.com/libretro/bsnes-libretro.git
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- Added audio supersampling support to greatly improve audio quality.
- 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.
This commit is contained in:
Lior Halphon
parent
b858f17425
commit
00623d4eea
60
Core/apu.c
60
Core/apu.c
@ -186,23 +186,52 @@ void GB_apu_get_samples_and_update_pcm_regs(GB_gameboy_t *gb, GB_sample_t *sampl
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void GB_apu_run(GB_gameboy_t *gb)
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{
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if (gb->sample_rate == 0) return;
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static bool should_log_overflow = true;
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while (gb->audio_copy_in_progress);
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double ticks_per_sample = (double) CPU_FREQUENCY / gb->sample_rate;
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if (gb->audio_quality == 0) {
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GB_sample_t sample;
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GB_apu_get_samples_and_update_pcm_regs(gb, &sample);
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gb->current_supersample.left += sample.left;
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gb->current_supersample.right += sample.right;
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gb->n_subsamples++;
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}
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else if (gb->audio_quality != 1) {
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double ticks_per_subsample = ticks_per_sample / gb->audio_quality;
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if (ticks_per_subsample < 1) {
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ticks_per_subsample = 1;
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}
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if (gb->apu_subsample_cycles > ticks_per_subsample) {
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gb->apu_subsample_cycles -= ticks_per_subsample;
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}
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GB_sample_t sample;
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GB_apu_get_samples_and_update_pcm_regs(gb, &sample);
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gb->current_supersample.left += sample.left;
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gb->current_supersample.right += sample.right;
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gb->n_subsamples++;
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}
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if (gb->apu_sample_cycles > ticks_per_sample) {
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gb->apu_sample_cycles -= ticks_per_sample;
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if (gb->audio_position == gb->buffer_size) {
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/*
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if (should_log_overflow && !gb->turbo) {
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GB_log(gb, "Audio overflow\n");
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should_log_overflow = false;
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if (!gb->turbo) {
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GB_log(gb, "Audio overflow\n");
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}
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*/
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}
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else {
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GB_apu_get_samples_and_update_pcm_regs(gb, &gb->audio_buffer[gb->audio_position++]);
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should_log_overflow = true;
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if (gb->audio_quality == 1) {
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GB_apu_get_samples_and_update_pcm_regs(gb, &gb->audio_buffer[gb->audio_position++]);
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}
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else {
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gb->audio_buffer[gb->audio_position].left = round(gb->current_supersample.left / gb->n_subsamples);
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gb->audio_buffer[gb->audio_position].right = round(gb->current_supersample.right / gb->n_subsamples);
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gb->n_subsamples = 0;
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gb->current_supersample = (GB_double_sample_t){0, };
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gb->audio_position++;
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}
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}
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}
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}
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@ -219,7 +248,14 @@ void GB_apu_copy_buffer(GB_gameboy_t *gb, GB_sample_t *dest, unsigned int count)
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if (count > gb->audio_position) {
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// GB_log(gb, "Audio underflow: %d\n", count - gb->audio_position);
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memset(dest + gb->audio_position, 0, (count - gb->audio_position) * sizeof(*gb->audio_buffer));
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if (gb->audio_position != 0) {
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for (unsigned i = 0; i < count - gb->audio_position; i++) {
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dest[gb->audio_position + i] = gb->audio_buffer[gb->audio_position - 1];
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}
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}
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else {
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memset(dest + gb->audio_position, 0, (count - gb->audio_position) * sizeof(*gb->audio_buffer));
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}
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count = gb->audio_position;
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}
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memcpy(dest, gb->audio_buffer, count * sizeof(*gb->audio_buffer));
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@ -443,3 +479,13 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
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break;
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}
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}
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void GB_set_audio_quality(GB_gameboy_t *gb, unsigned quality)
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{
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gb->audio_quality = quality;
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}
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unsigned GB_apu_get_current_buffer_length(GB_gameboy_t *gb)
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{
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return gb->audio_position;
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}
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12
Core/apu.h
12
Core/apu.h
@ -14,6 +14,12 @@ typedef struct
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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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@ -40,7 +46,7 @@ typedef struct
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typedef struct
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{
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uint8_t apu_cycles;
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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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@ -55,7 +61,11 @@ typedef struct
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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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@ -91,6 +91,7 @@ void GB_init(GB_gameboy_t *gb)
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gb->input_callback = default_input_callback;
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gb->async_input_callback = default_async_input_callback;
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gb->cartridge_type = &GB_cart_defs[0]; // Default cartridge type
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gb->audio_quality = 4;
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GB_reset(gb);
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}
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@ -105,6 +106,7 @@ void GB_init_cgb(GB_gameboy_t *gb)
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gb->input_callback = default_input_callback;
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gb->async_input_callback = default_async_input_callback;
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gb->cartridge_type = &GB_cart_defs[0]; // Default cartridge type
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gb->audio_quality = 4;
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GB_reset(gb);
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}
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19
Core/gb.h
19
Core/gb.h
@ -20,7 +20,7 @@
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#include "z80_cpu.h"
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#include "symbol_hash.h"
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#define GB_STRUCT_VERSION 10
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#define GB_STRUCT_VERSION 11
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enum {
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GB_REGISTER_AF,
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@ -325,12 +325,8 @@ struct GB_gameboy_internal_s {
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/* Timing */
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GB_SECTION(timing,
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GB_PADDING(int64_t, last_vblank);
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uint32_t display_cycles;
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uint32_t div_cycles;
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GB_PADDING(uint32_t, tima_cycles);
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GB_PADDING(uint32_t, dma_cycles);
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GB_aligned_double apu_sample_cycles;
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uint8_t tima_reload_state; /* After TIMA overflows, it becomes 0 for 4 cycles before actually reloading. */
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uint16_t serial_cycles;
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);
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@ -366,7 +362,6 @@ struct GB_gameboy_internal_s {
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uint32_t background_palettes_rgb[0x20];
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uint32_t sprite_palettes_rgb[0x20];
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int16_t previous_lcdc_x;
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GB_PADDING(uint8_t, padding);
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bool effective_window_enabled;
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uint8_t effective_window_y;
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bool stat_interrupt_line;
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@ -400,12 +395,18 @@ struct GB_gameboy_internal_s {
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uint64_t cycles_since_last_sync;
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/* Audio */
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unsigned int buffer_size;
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unsigned int sample_rate;
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unsigned int audio_position;
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unsigned buffer_size;
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unsigned sample_rate;
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unsigned audio_position;
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bool audio_stream_started; /* detects first copy request to minimize lag */
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volatile bool audio_copy_in_progress;
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volatile bool apu_lock;
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double apu_sample_cycles;
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double apu_subsample_cycles;
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GB_double_sample_t current_supersample;
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unsigned n_subsamples;
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unsigned audio_quality;
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/* Callbacks */
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void *user_data;
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@ -132,6 +132,7 @@ void GB_advance_cycles(GB_gameboy_t *gb, uint8_t cycles)
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// Not affected by speed boost
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gb->hdma_cycles += cycles;
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gb->apu_sample_cycles += cycles;
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gb->apu_subsample_cycles += cycles;
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gb->apu.apu_cycles += cycles;
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gb->cycles_since_ir_change += cycles;
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gb->cycles_since_input_ir_change += cycles;
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