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@ -5,8 +5,6 @@
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#include "mixer.h"
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struct MixerChannel {
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// Mixer
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Mixer *mx;
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bool active;
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// pointer to allocated buffer memory
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@ -25,10 +23,8 @@ struct MixerChannel {
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uint flags;
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};
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struct Mixer {
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uint32 play_rate;
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MixerChannel channels[8];
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};
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static MixerChannel _channels[8];
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static uint32 _play_rate;
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static void mix_int8_to_int16(MixerChannel *sc, int16 *buffer, uint samples)
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@ -79,7 +75,7 @@ static void MxCloseChannel(MixerChannel *mc)
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mc->memory = NULL;
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}
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void MxMixSamples(Mixer *mx, void *buffer, uint samples)
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void MxMixSamples(void *buffer, uint samples)
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{
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MixerChannel *mc;
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@ -87,7 +83,7 @@ void MxMixSamples(Mixer *mx, void *buffer, uint samples)
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memset(buffer, 0, sizeof(int16) * 2 * samples);
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// Mix each channel
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for (mc = mx->channels; mc != endof(mx->channels); mc++) {
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for (mc = _channels; mc != endof(_channels); mc++) {
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if (mc->active) {
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mix_int8_to_int16(mc, buffer, samples);
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if (mc->samples_left == 0) MxCloseChannel(mc);
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@ -104,13 +100,12 @@ void MxMixSamples(Mixer *mx, void *buffer, uint samples)
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#endif
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}
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MixerChannel *MxAllocateChannel(Mixer *mx)
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MixerChannel *MxAllocateChannel(void)
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{
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MixerChannel *mc;
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for (mc = mx->channels; mc != endof(mx->channels); mc++)
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for (mc = _channels; mc != endof(_channels); mc++)
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if (mc->memory == NULL) {
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mc->active = false;
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mc->mx = mx;
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return mc;
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}
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return NULL;
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@ -123,7 +118,7 @@ void MxSetChannelRawSrc(MixerChannel *mc, int8 *mem, uint size, uint rate, uint
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mc->frac_pos = 0;
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mc->pos = 0;
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mc->frac_speed = (rate << 16) / mc->mx->play_rate;
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mc->frac_speed = (rate << 16) / _play_rate;
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// adjust the magnitude to prevent overflow
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while (size & 0xFFFF0000) {
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@ -131,7 +126,7 @@ void MxSetChannelRawSrc(MixerChannel *mc, int8 *mem, uint size, uint rate, uint
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rate = (rate >> 1) + 1;
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}
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mc->samples_left = size * mc->mx->play_rate / rate;
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mc->samples_left = size * _play_rate / rate;
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}
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void MxSetChannelVolume(MixerChannel *mc, uint left, uint right)
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@ -149,8 +144,6 @@ void MxActivateChannel(MixerChannel* mc)
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bool MxInitialize(uint rate)
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{
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static Mixer mx;
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_mixer = &mx;
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mx.play_rate = rate;
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_play_rate = rate;
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return true;
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}
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