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melonDS
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* new FPS limiter 

* new audio output/sync method

about fucking time
This commit is contained in:
Arisotura 2019-08-29 15:55:18 +02:00
parent 626a9c1385
commit fbad8b0f43
3 changed files with 87 additions and 53 deletions
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47
src/SPU.cpp
View File

@ -26,7 +26,6 @@
// * capture addition modes, overflow bugs
// * channel hold
// * 'length less than 4' glitch
int brap = 0;
namespace SPU
{
@ -63,10 +62,10 @@ const s16 PSGTable[8][8] =
const u32 kSamplesPerRun = 1;
const u32 OutputBufferSize = 2*2*1024;
const u32 OutputBufferSize = 2*1024;
s16 OutputBuffer[2 * OutputBufferSize];
u32 OutputReadOffset;
u32 OutputWriteOffset;
volatile u32 OutputReadOffset;
volatile u32 OutputWriteOffset;
u16 Cnt;
@ -579,7 +578,7 @@ void CaptureUnit::Run(s32 sample)
}
}
int zog = 0, zig = 0;
void Mix(u32 samples)
{
s32 channelbuf[32];
@ -629,7 +628,7 @@ void Mix(u32 samples)
else if (val > 0x7FFF) val = 0x7FFF;
Capture[0]->Run(val);
if (!((Capture[0]->Cnt & (1<<7)))) break;
if (!(Capture[0]->Cnt & (1<<7))) break;
}
}
@ -644,7 +643,7 @@ void Mix(u32 samples)
else if (val > 0x7FFF) val = 0x7FFF;
Capture[1]->Run(val);
if (!((Capture[1]->Cnt & (1<<7)))) break;
if (!(Capture[1]->Cnt & (1<<7))) break;
}
}
@ -735,7 +734,6 @@ void Mix(u32 samples)
OutputWriteOffset += 2;
OutputWriteOffset &= ((2*OutputBufferSize)-1);
if (OutputWriteOffset == OutputReadOffset) printf("!! SOUND FIFO OVERFLOW %d\n", OutputWriteOffset>>1);
zog++; zig++; brap++;
}
NDS::ScheduleEvent(NDS::Event_SPU, true, 1024*kSamplesPerRun, Mix, kSamplesPerRun);
@ -744,13 +742,40 @@ void Mix(u32 samples)
int GetOutputSize()
{
return zog; // derp
int ret;
if (OutputWriteOffset >= OutputReadOffset)
ret = OutputWriteOffset - OutputReadOffset;
else
ret = (OutputBufferSize*2) - OutputReadOffset + OutputWriteOffset;
ret >>= 1;
return ret;
}
void Sync(bool wait)
{
// sync to audio output in case the core is running too fast
// * wait=true: wait until enough audio data has been played
// * wait=false: merely skip some audio data to avoid a FIFO overflow
const int halflimit = (OutputBufferSize / 2);
if (wait)
{
// TODO: less CPU-intensive wait?
while (GetOutputSize() > halflimit);
}
else if (GetOutputSize() > halflimit)
{
int readpos = OutputWriteOffset - (halflimit*2);
if (readpos < 0) readpos += (OutputBufferSize*2);
OutputReadOffset = readpos;
}
}
int ReadOutput(s16* data, int samples)
{
printf("ReadOutput(%d): wrote=%d level=%d ReadOffset=%d WriteOffset=%d\n", samples, zog, zig, OutputReadOffset>>1, OutputWriteOffset>>1);
zog = 0; zig -= (zig<samples ? zig : samples);
if (OutputReadOffset == OutputWriteOffset)
return 0;

1
src/SPU.h
View File

@ -36,6 +36,7 @@ void SetBias(u16 bias);
void Mix(u32 samples);
int GetOutputSize();
void Sync(bool wait);
int ReadOutput(s16* data, int samples);
u8 Read8(u32 addr);

92
src/libui_sdl/main.cpp
View File

@ -158,6 +158,7 @@ bool LidStatus;
int JoystickID;
SDL_Joystick* Joystick;
int AudioFreq;
SDL_AudioDeviceID AudioDevice, MicDevice;
u32 MicBufferLength = 2048;
@ -560,26 +561,28 @@ void MicLoadWav(char* name)
void AudioCallback(void* data, Uint8* stream, int len)
{
// resampling:
// buffer length is 1024 samples
// which is 710 samples at the original sample rate
len /= (sizeof(s16) * 2);
s16 buf_in[710*2];
// resample incoming audio to match the output sample rate
int len_in = (int)ceil((len * 32823.6328125) / (float)AudioFreq);
s16 buf_in[1024*2];
s16* buf_out = (s16*)stream;
int num_in = SPU::ReadOutput(buf_in, 710);
int num_out = 1024;
printf("took %d/%d samples\n", num_in, 710);
int num_in = SPU::ReadOutput(buf_in, len_in);
int num_out = len;
int margin = 6;
if (num_in < 710-margin)
if (num_in < len_in-margin)
{
int last = num_in-1;
if (last < 0) last = 0;
for (int i = num_in; i < 710-margin; i++)
for (int i = num_in; i < len_in-margin; i++)
((u32*)buf_in)[i] = ((u32*)buf_in)[last];
num_in = 710-margin;
num_in = len_in-margin;
}
float res_incr = num_in / (float)num_out;
@ -590,10 +593,20 @@ printf("took %d/%d samples\n", num_in, 710);
for (int i = 0; i < 1024; i++)
{
// TODO: interp!!
buf_out[i*2 ] = (buf_in[res_pos*2 ] * volume) >> 8;
buf_out[i*2+1] = (buf_in[res_pos*2+1] * volume) >> 8;
/*s16 s_l = buf_in[res_pos*2 ];
s16 s_r = buf_in[res_pos*2+1];
float a = res_timer;
float b = 1.0 - a;
s_l = (s_l * a) + (buf_in[(res_pos-1)*2 ] * b);
s_r = (s_r * a) + (buf_in[(res_pos-1)*2+1] * b);
buf_out[i*2 ] = (s_l * volume) >> 8;
buf_out[i*2+1] = (s_r * volume) >> 8;*/
res_timer += res_incr;
while (res_timer >= 1.0)
{
@ -838,6 +851,7 @@ bool JoyButtonHeld(int btnid, int njoybuttons, Uint8* joybuttons, Uint32 hat)
void UpdateWindowTitle(void* data)
{
if (EmuStatus == 0) return;
uiWindowSetTitle(MainWindow, (const char*)data);
}
@ -880,6 +894,10 @@ int EmuThreadFunc(void* burp)
u32 lasttick = starttick;
u32 lastmeasuretick = lasttick;
u32 fpslimitcount = 0;
u64 perfcount = SDL_GetPerformanceCounter();
u64 perffreq = SDL_GetPerformanceFrequency();
float samplesleft = 0;
u32 nsamples = 0;
char melontitle[100];
while (EmuRunning != 0)
@ -959,43 +977,30 @@ int EmuThreadFunc(void* burp)
}
uiAreaQueueRedrawAll(MainDrawArea);
// framerate limiter based off SDL2_gfx
bool limitfps = Config::LimitFPS && !HotkeyDown(HK_FastForward);
SPU::Sync(limitfps);
float framerate = (1000.0f * nlines) / (60.0f * 263.0f);
/*fpslimitcount++;
u32 curtick = SDL_GetTicks();
u32 delay = curtick - lasttick;
lasttick = curtick;
bool limitfps = Config::LimitFPS && !HotkeyDown(HK_FastForward);
u32 wantedtick = starttick + (u32)((float)fpslimitcount * framerate);
if (curtick < wantedtick && limitfps)
{
SDL_Delay(wantedtick - curtick);
}
else
{
fpslimitcount = 0;
starttick = curtick;
}*/
fpslimitcount++;
if (fpslimitcount >= 3)
{
u32 curtick = SDL_GetTicks();
u32 delay = curtick - lasttick;
bool limitfps = Config::LimitFPS && !HotkeyDown(HK_FastForward);
u32 wantedtick = lasttick + (u32)((float)fpslimitcount * framerate);
if (curtick < wantedtick && limitfps)
if (limitfps)
{
SDL_Delay(wantedtick - curtick);
}
float wantedtickF = starttick + (framerate * (fpslimitcount+1));
u32 wantedtick = (u32)ceil(wantedtickF);
if (curtick < wantedtick) SDL_Delay(wantedtick - curtick);
lasttick = SDL_GetTicks();
fpslimitcount = 0;
lasttick = SDL_GetTicks();
fpslimitcount++;
if ((abs(wantedtickF - (float)wantedtick) < 0.001312) || (fpslimitcount > 60))
{
fpslimitcount = 0;
nsamples = 0;
starttick = lasttick;
}
}
}
nframes++;
@ -2649,20 +2654,23 @@ int main(int argc, char** argv)
uiMenuItemSetChecked(MenuItem_LimitFPS, Config::LimitFPS==1);
uiMenuItemSetChecked(MenuItem_ShowOSD, Config::ShowOSD==1);
AudioFreq = 48000; // TODO: make configurable?
SDL_AudioSpec whatIwant, whatIget;
memset(&whatIwant, 0, sizeof(SDL_AudioSpec));
whatIwant.freq = 47340;
whatIwant.freq = AudioFreq;
whatIwant.format = AUDIO_S16LSB;
whatIwant.channels = 2;
whatIwant.samples = 1024;
whatIwant.callback = AudioCallback;
AudioDevice = SDL_OpenAudioDevice(NULL, 0, &whatIwant, &whatIget, 0);
AudioDevice = SDL_OpenAudioDevice(NULL, 0, &whatIwant, &whatIget, SDL_AUDIO_ALLOW_FREQUENCY_CHANGE);
if (!AudioDevice)
{
printf("Audio init failed: %s\n", SDL_GetError());
}
else
{
AudioFreq = whatIget.freq;
printf("Audio output frequency: %d Hz\n", AudioFreq);
SDL_PauseAudioDevice(AudioDevice, 1);
}