39 static uint32 _play_rate = 11025;
40 static uint32 _max_size = UINT_MAX;
61 return ((b[0] * ((1 << 16) - frac_pos)) + (b[1] * frac_pos)) >> 16;
64 static void mix_int16(
MixerChannel *sc, int16 *buffer, uint samples, uint8 effect_vol)
66 if (samples > sc->samples_left) samples = sc->samples_left;
67 sc->samples_left -= samples;
70 const int16 *b = (
const int16 *)sc->memory + sc->pos;
71 uint32 frac_pos = sc->frac_pos;
72 uint32 frac_speed = sc->frac_speed;
73 int volume_left = sc->volume_left * effect_vol / 255;
74 int volume_right = sc->volume_right * effect_vol / 255;
76 if (frac_speed == 0x10000) {
83 }
while (--samples > 0);
90 frac_pos += frac_speed;
93 }
while (--samples > 0);
96 sc->frac_pos = frac_pos;
97 sc->pos = b - (
const int16 *)sc->memory;
100 static void mix_int8_to_int16(
MixerChannel *sc, int16 *buffer, uint samples, uint8 effect_vol)
102 if (samples > sc->samples_left) samples = sc->samples_left;
103 sc->samples_left -= samples;
106 const int8 *b = sc->memory + sc->pos;
107 uint32 frac_pos = sc->frac_pos;
108 uint32 frac_speed = sc->frac_speed;
109 int volume_left = sc->volume_left * effect_vol / 255;
110 int volume_right = sc->volume_right * effect_vol / 255;
112 if (frac_speed == 0x10000) {
119 }
while (--samples > 0);
126 frac_pos += frac_speed;
129 }
while (--samples > 0);
132 sc->frac_pos = frac_pos;
133 sc->pos = b - sc->memory;
141 void MxMixSamples(
void *buffer, uint samples)
144 static uint last_samples = 0;
145 if (samples != last_samples) {
146 framerate.SetExpectedRate((
double)_play_rate / samples);
147 last_samples = samples;
153 memset(buffer, 0,
sizeof(int16) * 2 * samples);
156 if (_music_stream) _music_stream((int16*)buffer, samples);
167 for (mc = _channels; mc !=
endof(_channels); mc++) {
170 mix_int16(mc, (int16*)buffer, samples, effect_vol);
172 mix_int8_to_int16(mc, (int16*)buffer, samples, effect_vol);
174 if (mc->samples_left == 0) MxCloseChannel(mc);
182 for (mc = _channels; mc !=
endof(_channels); mc++) {
185 mc->memory =
nullptr;
192 void MxSetChannelRawSrc(
MixerChannel *mc, int8 *mem,
size_t size, uint rate,
bool is16bit)
198 mc->frac_speed = (rate << 16) / _play_rate;
200 if (is16bit) size /= 2;
203 while (size >= _max_size) {
205 rate = (rate >> 1) + 1;
208 mc->samples_left = (uint)size * _play_rate / rate;
209 mc->is16bit = is16bit;
222 mc->volume_left = (uint)(sin((1.0 - pan) * M_PI / 2.0) * volume);
223 mc->volume_right = (uint)(sin(pan * M_PI / 2.0) * volume);
239 _music_stream = music_callback;
244 bool MxInitialize(uint rate)
247 _max_size = UINT_MAX / _play_rate;
248 _music_stream =
nullptr;