diff options
Diffstat (limited to 'engines/agi/sound.cpp')
| -rw-r--r-- | engines/agi/sound.cpp | 41 |
1 files changed, 22 insertions, 19 deletions
diff --git a/engines/agi/sound.cpp b/engines/agi/sound.cpp index 3ce6d57d0e..7769616fff 100644 --- a/engines/agi/sound.cpp +++ b/engines/agi/sound.cpp @@ -66,22 +66,19 @@ struct IIgsEnvelope { struct IIgsWaveInfo { uint8 top; - uint8 addr; - uint8 size; -// Oscillator channel (Bits 4-7 of mode-byte). Simplified to use only stereo here. -#define MASK_OSC_CHANNEL (1 << 4) -#define OSC_CHANNEL_LEFT (1 << 4) -#define OSC_CHANNEL_RIGHT (0 << 4) -// Oscillator halt bit (Bit 0 of mode-byte) -#define MASK_OSC_HALT (1 << 0) -#define OSC_HALT (1 << 0) -// Oscillator mode (Bits 1 and 2 of mode-byte) -#define MASK_OSC_MODE (3 << 1) -#define OSC_MODE_LOOP (0 << 1) -#define OSC_MODE_ONESHOT (1 << 1) -#define OSC_MODE_SYNC_AM (2 << 1) -#define OSC_MODE_SWAP (3 << 1) - uint8 mode; + uint addr; + uint size; +// Oscillator channel +#define OSC_CHANNEL_RIGHT 0 +#define OSC_CHANNEL_LEFT 1 + uint channel; +// Oscillator mode +#define OSC_MODE_LOOP 0 +#define OSC_MODE_ONESHOT 1 +#define OSC_MODE_SYNC_AM 2 +#define OSC_MODE_SWAP 3 + uint mode; + bool halt; uint16 relPitch; ///< 8b.8b fixed point, big endian? }; @@ -128,9 +125,15 @@ bool readIIgsEnvelope(IIgsEnvelope &envelope, Common::SeekableReadStream &stream bool readIIgsWaveInfo(IIgsWaveInfo &waveInfo, Common::SeekableReadStream &stream) { waveInfo.top = stream.readByte(); - waveInfo.addr = stream.readByte(); - waveInfo.size = stream.readByte(); - waveInfo.mode = stream.readByte(); + waveInfo.addr = stream.readByte() * 256; + waveInfo.size = (1 << (stream.readByte() & 7)) * 256; + + // Read mode byte and parse it into parts + byte mode = stream.readByte(); + waveInfo.channel = (mode >> 4) & 1; // Bit 4 + waveInfo.mode = (mode >> 1) & 3; // Bits 1-2 + waveInfo.halt = (mode & 1) != 0; // Bit 0 (Converted to boolean) + waveInfo.relPitch = stream.readUint16BE(); return !stream.ioFailed(); } |