# HG changeset patch
# User Michael Pavone <pavone@retrodev.com>
# Date 1707365003 28800
# Node ID 18816c5c11d42970d7f545e1e2b32fd1a50a2080
# Parent  61c0bfe1088712c1b74bb0820d28efb542aa93ac
Fix Pico ADPCM decoding and get relative volume approximately correct

diff -r 61c0bfe10887 -r 18816c5c11d4 pico_pcm.c
--- a/pico_pcm.c	Tue Feb 06 21:47:11 2024 -0800
+++ b/pico_pcm.c	Wed Feb 07 20:03:23 2024 -0800
@@ -78,7 +78,7 @@
 	};
 	static const int state_delta[16] = {-1, -1, 0, 0, 1, 2, 2, 3, -1, -1, 0, 0, 1, 2, 2, 3};
 	int16_t ret = sample_delta[(*state << 4) + sample];
-	int diff = state_delta[*state];
+	int diff = state_delta[sample];
 	if (diff >= 0 || *state > 0) {
 		*state += diff;
 		if (*state > 15) {
@@ -97,10 +97,10 @@
 		int16_t shift = pcm->ctrl & PCM_VOLUME;
 #ifndef IS_LIB
 		if (pcm->scope) {
-			scope_add_sample(pcm->scope, pcm->scope_channel, (pcm->output >> shift) * 128, 0);
+			scope_add_sample(pcm->scope, pcm->scope_channel, (pcm->output >> shift) * 32, 0);
 		}
 #endif
-		render_put_mono_sample(pcm->audio, (pcm->output >> shift) * 128);
+		render_put_mono_sample(pcm->audio, (pcm->output >> shift) * 32);
 		if (!(pcm->ctrl & PCM_ENABLED)) {
 			continue;
 		}