diff options
Diffstat (limited to 'engines/sci')
| -rw-r--r-- | engines/sci/sound/decoders/sol.cpp | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/engines/sci/sound/decoders/sol.cpp b/engines/sci/sound/decoders/sol.cpp index 121ffe400a..4b366ce9f4 100644 --- a/engines/sci/sound/decoders/sol.cpp +++ b/engines/sci/sound/decoders/sol.cpp @@ -54,13 +54,21 @@ static const byte tableDPCM8[8] = { 0, 1, 2, 3, 6, 10, 15, 21 }; * Decompresses one channel of 16-bit DPCM compressed audio. */ static void deDPCM16Channel(int16 *out, int16 &sample, uint8 delta) { + int32 nextSample = sample; if (delta & 0x80) { - sample -= tableDPCM16[delta & 0x7f]; + nextSample -= tableDPCM16[delta & 0x7f]; } else { - sample += tableDPCM16[delta]; + nextSample += tableDPCM16[delta]; } - sample = CLIP<int16>(sample, -32768, 32767); - *out = sample; + + // Emulating x86 16-bit signed register overflow + if (nextSample > 32767) { + nextSample -= 65536; + } else if (nextSample < -32768) { + nextSample += 65536; + } + + *out = sample = nextSample; } /** @@ -101,7 +109,6 @@ static void deDPCM8Nibble(int16 *out, uint8 &sample, uint8 delta) { } else { sample += tableDPCM8[delta & 7]; } - sample = CLIP<byte>(sample, 0, 255); *out = ((lastSample + sample) << 7) ^ 0x8000; } |