shithub: pt2-clone

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Fixed a small stuttering issue in the audio/video syncing

--- a/src/pt2_audio.c

+++ b/src/pt2_audio.c

@@ -1275,12 +1275,22 @@

 	calcAudioLatencyVars(audio.audioBufferSize, audio.outputRate);

-	audio.tickTimeLengthTab[0] = UINT64_MAX;

-	const double dMul = (editor.dPerfFreq / audio.outputRate) * (UINT32_MAX + 1.0);

-	for (int32_t i = 1; i < 256-32; i++)

+	for (int32_t i = 32; i <= 255; i++)

 	{

+		const double dBpmHz = i / 2.5;

+

 		// number of samples per tick -> tick length for performance counter (syncing visuals to audio)

-		audio.tickTimeLengthTab[i] = (uint64_t)(audio.bpmTab[i] * dMul);

+		double dTimeInt;

+		double dTimeFrac = modf(editor.dPerfFreq / dBpmHz, &dTimeInt);

+		const int32_t timeInt = (int32_t)dTimeInt;

+

+		// fractional part (scaled to 0..2^32-1)

+		dTimeFrac *= UINT32_MAX;

+		dTimeFrac += 0.5;

+		if (dTimeFrac > UINT32_MAX)

+			dTimeFrac = UINT32_MAX;

+

+		audio.tickTimeLengthTab[i-32] = ((uint64_t)timeInt << 32) | (uint32_t)dTimeFrac;

 	}

 	audio.resetSyncTickTimeFlag = true;

--- a/src/pt2_header.h

+++ b/src/pt2_header.h

@@ -14,7 +14,7 @@

 #include "pt2_unicode.h"

 #include "pt2_palette.h"

-#define PROG_VER_STR "1.21"

+#define PROG_VER_STR "1.22"

 #ifdef _WIN32

 #define DIR_DELIMITER '\\'