38 static uint32 _play_rate = 11025;
39 static uint32 _max_size = UINT_MAX;
60 return ((b[0] * ((1 << 16) - frac_pos)) + (b[1] * frac_pos)) >> 16;
63 static void mix_int16(
MixerChannel *sc, int16 *buffer, uint samples)
65 if (samples > sc->samples_left) samples = sc->samples_left;
66 sc->samples_left -= samples;
69 const int16 *b = (
const int16 *)sc->memory + sc->pos;
70 uint32 frac_pos = sc->frac_pos;
71 uint32 frac_speed = sc->frac_speed;
72 int volume_left = sc->volume_left;
73 int volume_right = sc->volume_right;
75 if (frac_speed == 0x10000) {
82 }
while (--samples > 0);
89 frac_pos += frac_speed;
92 }
while (--samples > 0);
95 sc->frac_pos = frac_pos;
96 sc->pos = b - (
const int16 *)sc->memory;
99 static void mix_int8_to_int16(
MixerChannel *sc, int16 *buffer, uint samples)
101 if (samples > sc->samples_left) samples = sc->samples_left;
102 sc->samples_left -= samples;
105 const int8 *b = sc->memory + sc->pos;
106 uint32 frac_pos = sc->frac_pos;
107 uint32 frac_speed = sc->frac_speed;
108 int volume_left = sc->volume_left;
109 int volume_right = sc->volume_right;
111 if (frac_speed == 0x10000) {
118 }
while (--samples > 0);
125 frac_pos += frac_speed;
128 }
while (--samples > 0);
131 sc->frac_pos = frac_pos;
132 sc->pos = b - sc->memory;
140 void MxMixSamples(
void *buffer, uint samples)
143 static uint last_samples = 0;
144 if (samples != last_samples) {
145 framerate.SetExpectedRate((
double)_play_rate / samples);
146 last_samples = samples;
152 memset(buffer, 0,
sizeof(int16) * 2 * samples);
155 if (_music_stream) _music_stream((int16*)buffer, samples);
158 for (mc = _channels; mc !=
endof(_channels); mc++) {
161 mix_int16(mc, (int16*)buffer, samples);
163 mix_int8_to_int16(mc, (int16*)buffer, samples);
165 if (mc->samples_left == 0) MxCloseChannel(mc);
173 for (mc = _channels; mc !=
endof(_channels); mc++) {
176 mc->memory =
nullptr;
183 void MxSetChannelRawSrc(
MixerChannel *mc, int8 *mem,
size_t size, uint rate,
bool is16bit)
189 mc->frac_speed = (rate << 16) / _play_rate;
191 if (is16bit) size /= 2;
194 while (size >= _max_size) {
196 rate = (rate >> 1) + 1;
199 mc->samples_left = (uint)size * _play_rate / rate;
200 mc->is16bit = is16bit;
213 mc->volume_left = (uint)(sin((1.0 - pan) * M_PI / 2.0) * volume);
214 mc->volume_right = (uint)(sin(pan * M_PI / 2.0) * volume);
230 _music_stream = music_callback;
235 bool MxInitialize(uint rate)
238 _max_size = UINT_MAX / _play_rate;
239 _music_stream =
nullptr;