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changeset 2432:18816c5c11d4

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Fix Pico ADPCM decoding and get relative volume approximately correct
author Michael Pavone <pavone@retrodev.com>
date Wed, 07 Feb 2024 20:03:23 -0800
parents 61c0bfe10887
children 2907c3312423
files pico_pcm.c
diffstat 1 files changed, 3 insertions(+), 3 deletions(-) [+]
line wrap: on
line diff
--- 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;
 		}