# HG changeset patch
# User Michael Pavone <pavone@retrodev.com>
# Date 1569122772 25200
# Node ID 377f110e4cea9b5d2c5a8d20b74723aa5a9ef277
# Parent  bd60e74fd173283fe8424bd191f26a59f34c1d8a
Report more accurate frame and sample rates to frontend in libretro target

diff -r bd60e74fd173 -r 377f110e4cea genesis.c
--- a/genesis.c	Sat Sep 21 20:23:53 2019 -0700
+++ b/genesis.c	Sat Sep 21 20:26:12 2019 -0700
@@ -34,7 +34,7 @@
 #define LINES_PAL 313
 
 #ifdef IS_LIB
-#define MAX_SOUND_CYCLES 1000
+#define MAX_SOUND_CYCLES (MCLKS_PER_YM*NUM_OPERATORS*6)
 #else
 #define MAX_SOUND_CYCLES 100000	
 #endif
diff -r bd60e74fd173 -r 377f110e4cea libblastem.c
--- a/libblastem.c	Sat Sep 21 20:23:53 2019 -0700
+++ b/libblastem.c	Sat Sep 21 20:26:12 2019 -0700
@@ -126,6 +126,7 @@
 	}
 }
 
+static int32_t sample_rate;
 RETRO_API void retro_get_system_av_info(struct retro_system_av_info *info)
 {
 	update_overscan();
@@ -135,8 +136,11 @@
 	last_height = info->geometry.base_height;
 	info->geometry.max_height = info->geometry.base_height * 2;
 	info->geometry.aspect_ratio = 0;
-	info->timing.fps = video_standard == VID_NTSC ? 60 : 50;
-	info->timing.sample_rate = 53267; //approximate sample rate of YM2612
+	double master_clock = video_standard == VID_NTSC ? 53693175 : 53203395;
+	double lines = video_standard == VID_NTSC ? 262 : 313;
+	info->timing.fps = master_clock / (3420.0 * lines);
+	info->timing.sample_rate = master_clock / (7 * 6 * 24); //sample rate of YM2612
+	sample_rate = info->timing.sample_rate;
 }
 
 RETRO_API void retro_set_controller_port_device(unsigned port, unsigned device)
@@ -416,7 +420,7 @@
 {
 	for (int i = 0; i < num_audio_sources; i++)
 	{
-		int32_t min_samples = audio_sources[i]->freq / 53267;
+		int32_t min_samples = audio_sources[i]->freq / sample_rate;
 		if (audio_sources[i]->num_samples < min_samples) {
 			return;
 		}