void GBAudioInit(struct GBAudio* audio, size_t samples, uint8_t* nr52, enum GBAudioStyle style) {
audio->samples = samples;
audio->left = blip_new(BLIP_BUFFER_SIZE);
audio->right = blip_new(BLIP_BUFFER_SIZE);
audio->clockRate = DMG_LR35902_FREQUENCY;
// Guess too large; we hang producing extra samples if we guess too low
blip_set_rates(audio->left, DMG_LR35902_FREQUENCY, 96000);
blip_set_rates(audio->right, DMG_LR35902_FREQUENCY, 96000);
audio->forceDisableCh[0] = false;
audio->forceDisableCh[1] = false;
audio->forceDisableCh[2] = false;
audio->forceDisableCh[3] = false;
audio->masterVolume = GB_AUDIO_VOLUME_MAX;
audio->nr52 = nr52;
audio->style = style;
}
int audio_init(int samplerate, double framerate)
{
/* Shutdown first */
audio_shutdown();
/* Clear the sound data context */
memset(&snd, 0, sizeof (snd));
/* Initialize Blip Buffers */
snd.blips[0] = blip_new(samplerate / 10);
if (!snd.blips[0])
{
return -1;
}
/* Mega CD sound hardware */
if (system_hw == SYSTEM_MCD)
{
/* allocate blip buffers */
snd.blips[1] = blip_new(samplerate / 10);
snd.blips[2] = blip_new(samplerate / 10);
if (!snd.blips[1] || !snd.blips[2])
{
audio_shutdown();
return -1;
}
}
/* Initialize resampler internal rates */
audio_set_rate(samplerate, framerate);
/* Set audio enable flag */
snd.enabled = 1;
/* Reset audio */
audio_reset();
return (0);
}
ECL_EXPORT bool Init(bool cgb, const uint8_t *spc, int spclen)
{
if (spc)
{
GB_init_sgb(&GB);
if (!sgb_init(spc, spclen))
return false;
sgb = true;
}
else if (cgb)
{
GB_init_cgb(&GB);
}
else
{
GB_init(&GB);
}
if (GB_load_boot_rom(&GB, "boot.rom") != 0)
return false;
if (GB_load_rom(&GB, "game.rom") != 0)
return false;
GB_set_pixels_output(&GB, GBPixels);
GB_set_vblank_callback(&GB, VBlankCallback);
GB_set_log_callback(&GB, LogCallback);
GB_set_rgb_encode_callback(&GB, RgbEncodeCallback);
GB_set_infrared_callback(&GB, InfraredCallback);
GB_set_rumble_callback(&GB, RumbleCallback);
GB_set_sample_callback(&GB, SampleCallback);
leftblip = blip_new(1024);
rightblip = blip_new(1024);
blip_set_rates(leftblip, sgb ? SOUND_RATE_SGB : SOUND_RATE_GB, 44100);
blip_set_rates(rightblip, sgb ? SOUND_RATE_SGB : SOUND_RATE_GB, 44100);
return true;
}
void GBAAudioInit(struct GBAAudio* audio, size_t samples) {
audio->samples = samples;
#if RESAMPLE_LIBRARY != RESAMPLE_BLIP_BUF
CircleBufferInit(&audio->left, samples * sizeof(int16_t));
CircleBufferInit(&audio->right, samples * sizeof(int16_t));
#else
audio->left = blip_new(BLIP_BUFFER_SIZE);
audio->right = blip_new(BLIP_BUFFER_SIZE);
// Guess too large; we hang producing extra samples if we guess too low
blip_set_rates(audio->left, GBA_ARM7TDMI_FREQUENCY, 96000);
blip_set_rates(audio->right, GBA_ARM7TDMI_FREQUENCY, 96000);
#endif
CircleBufferInit(&audio->chA.fifo, GBA_AUDIO_FIFO_SIZE);
CircleBufferInit(&audio->chB.fifo, GBA_AUDIO_FIFO_SIZE);
audio->forceDisableCh[0] = false;
audio->forceDisableCh[1] = false;
audio->forceDisableCh[2] = false;
audio->forceDisableCh[3] = false;
audio->forceDisableChA = false;
audio->forceDisableChB = false;
audio->masterVolume = GBA_AUDIO_VOLUME_MAX;
}
int audio_init(int samplerate, double framerate)
{
/* Number of M-cycles executed per second. */
/* All emulated chips are kept in sync by using a common oscillator (MCLOCK) */
/* */
/* The original console would run exactly 53693175 M-cycles per sec (53203424 for PAL), */
/* 3420 M-cycles per line and 262 (313 for PAL) lines per frame, which gives an exact */
/* framerate of 59.92 (49.70 for PAL) frames per second. */
/* */
/* Since audio samples are generated at the end of the frame, to prevent audio skipping */
/* or lag between emulated frames, number of samples rendered per frame must be set to */
/* output samplerate (number of samples played per second) divided by input framerate */
/* (number of frames emulated per seconds). */
/* */
/* On some systems, we may want to achieve 100% smooth video rendering by synchronizing */
/* frame emulation with VSYNC, which frequency is generally not exactly those values. */
/* In that case, input framerate (number of frames emulated per seconds) is the same as */
/* output framerate (number of frames rendered per seconds) by the host video hardware. */
/* */
/* When no framerate is specified, base clock is set to original master clock value. */
/* Otherwise, it is set to number of M-cycles emulated per line (fixed) multiplied by */
/* number of lines per frame (VDP mode specific) multiplied by input framerate. */
/* */
double mclk = framerate ? (MCYCLES_PER_LINE * (vdp_pal ? 313 : 262) * framerate) : system_clock;
/* Shutdown first */
audio_shutdown();
/* Clear the sound data context */
memset(&snd, 0, sizeof (snd));
/* Initialize audio rates */
snd.sample_rate = samplerate;
snd.frame_rate = framerate;
/* Initialize Blip Buffers */
snd.blips[0][0] = blip_new(samplerate / 10);
snd.blips[0][1] = blip_new(samplerate / 10);
if (!snd.blips[0][0] || !snd.blips[0][1])
{
audio_shutdown();
return -1;
}
/* For maximal accuracy, sound chips are running at their original rate using common */
/* master clock timebase so they remain perfectly synchronized together, while still */
/* being synchronized with 68K and Z80 CPUs as well. Mixed sound chip output is then */
/* resampled to desired rate at the end of each frame, using Blip Buffer. */
blip_set_rates(snd.blips[0][0], mclk, samplerate);
blip_set_rates(snd.blips[0][1], mclk, samplerate);
/* Initialize PSG core */
SN76489_Init(snd.blips[0][0], snd.blips[0][1], (system_hw < SYSTEM_MARKIII) ? SN_DISCRETE : SN_INTEGRATED);
/* Mega CD sound hardware */
if (system_hw == SYSTEM_MCD)
{
/* allocate blip buffers */
snd.blips[1][0] = blip_new(samplerate / 10);
snd.blips[1][1] = blip_new(samplerate / 10);
snd.blips[2][0] = blip_new(samplerate / 10);
snd.blips[2][1] = blip_new(samplerate / 10);
if (!snd.blips[1][0] || !snd.blips[1][1] || !snd.blips[2][0] || !snd.blips[2][1])
{
audio_shutdown();
return -1;
}
/* Initialize PCM core */
pcm_init(snd.blips[1][0], snd.blips[1][1]);
/* Initialize CDD core */
cdd_init(snd.blips[2][0], snd.blips[2][1]);
}
/* Set audio enable flag */
snd.enabled = 1;
/* Reset audio */
audio_reset();
return (0);
}
void init_audio_for_rom() {
// Maximum number of unread samples the buffer can hold
blip = blip_new(sample_rate/10);
blip_set_rates(blip, cpu_clock_rate, sample_rate);
}
