From 94a138521f2ac37d238ca75ee0a052587fcfad87 Mon Sep 17 00:00:00 2001 From: Michael Pavone Date: Tue, 11 Feb 2014 12:45:43 -0800 Subject: Fix overflow handling on FM channel output --- ym2612.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) (limited to 'ym2612.c') diff --git a/ym2612.c b/ym2612.c index 978dc95..feb3a18 100644 --- a/ym2612.c +++ b/ym2612.c @@ -470,9 +470,16 @@ void ym_run(ym2612_context * context, uint32_t to_cycle) context->audio_buffer[context->buffer_pos] = 0; context->audio_buffer[context->buffer_pos + 1] = 0; for (int i = 0; i < NUM_CHANNELS; i++) { - int16_t value = context->channels[i].output & 0x3FE0; - if (value & 0x2000) { - value |= 0xC000; + int16_t value = context->channels[i].output; + if (value > 0x1FE0) { + value = 0x1FE0; + } else if (value < -0x1FF0) { + value = -0x1FF0; + } else { + value &= 0x3FE0; + if (value & 0x2000) { + value |= 0xC000; + } } if (context->channels[i].logfile) { fwrite(&value, sizeof(value), 1, context->channels[i].logfile); -- cgit v1.2.3