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ULTIMA8: Set volume and balance on sfx

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This commit is contained in:
Matthew Duggan 2020-03-29 14:21:37 +09:00
parent f5712907d1
commit 5796de1db6
1 changed files with 3 additions and 11 deletions
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14
engines/ultima/ultima8/audio/audio_channel.cpp
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@ -30,16 +30,6 @@
namespace Ultima {
namespace Ultima8 {
// We divide the data by 2, to prevent overshots. Imagine this _sample pattern:
// 0, 65535, 65535, 0. Now you want to compute a value between the two 65535.
// Obviously, it will be *bigger* than 65535 (it can get to about 80,000).
// It is possibly to clamp it, but that leads to a distored wave form. Compare
// this to turning up the volume of your stereo to much, it will start to sound
// bad at a certain level (depending on the power of your stereo, your speakers
// etc, this can be quite loud, though ;-). Hence we reduce the original range.
// A factor of roughly 1/1.2 = 0.8333 is sufficient. Since we want to avoid
// floating point, we approximate that by 27/32
#define RANGE_REDUX(x) (((x) * 27) >> 5)
AudioChannel::AudioChannel(Audio::Mixer *mixer, uint32 sampleRate, bool stereo) :
_mixer(mixer), _decompressorSize(0), _frameSize(0), _loop(0), _sample(nullptr),
@ -95,7 +85,9 @@ void AudioChannel::playSample(AudioSample *sample, int loop, int priority, bool
new Audio::LoopingAudioStream(audioStream, _loop);
// Play it
_mixer->playStream(Audio::Mixer::kPlainSoundType, &_soundHandle, stream);
int vol = (_lVol + _rVol) / 2;
int balance = (_rVol - _lVol);
_mixer->playStream(Audio::Mixer::kPlainSoundType, &_soundHandle, stream, -1, vol, balance);
if (paused)
_mixer->pauseHandle(_soundHandle, true);
}