40 static uint32 _play_rate = 11025;
41 static uint32 _max_size = UINT_MAX;
43 static std::mutex _music_stream_mutex;
63 return ((b[0] * ((1 << 16) - frac_pos)) + (b[1] * frac_pos)) >> 16;
66 static void mix_int16(
MixerChannel *sc, int16 *buffer, uint samples, uint8 effect_vol)
68 if (samples > sc->samples_left) samples = sc->samples_left;
69 sc->samples_left -= samples;
72 const int16 *b = (
const int16 *)sc->memory + sc->pos;
73 uint32 frac_pos = sc->frac_pos;
74 uint32 frac_speed = sc->frac_speed;
75 int volume_left = sc->volume_left * effect_vol / 255;
76 int volume_right = sc->volume_right * effect_vol / 255;
78 if (frac_speed == 0x10000) {
85 }
while (--samples > 0);
92 frac_pos += frac_speed;
95 }
while (--samples > 0);
98 sc->frac_pos = frac_pos;
99 sc->pos = b - (
const int16 *)sc->memory;
102 static void mix_int8_to_int16(
MixerChannel *sc, int16 *buffer, uint samples, uint8 effect_vol)
104 if (samples > sc->samples_left) samples = sc->samples_left;
105 sc->samples_left -= samples;
108 const int8 *b = sc->memory + sc->pos;
109 uint32 frac_pos = sc->frac_pos;
110 uint32 frac_speed = sc->frac_speed;
111 int volume_left = sc->volume_left * effect_vol / 255;
112 int volume_right = sc->volume_right * effect_vol / 255;
114 if (frac_speed == 0x10000) {
121 }
while (--samples > 0);
128 frac_pos += frac_speed;
131 }
while (--samples > 0);
134 sc->frac_pos = frac_pos;
135 sc->pos = b - sc->memory;
143 void MxMixSamples(
void *buffer, uint samples)
146 static uint last_samples = 0;
147 if (samples != last_samples) {
148 framerate.SetExpectedRate((
double)_play_rate / samples);
149 last_samples = samples;
155 memset(buffer, 0,
sizeof(int16) * 2 * samples);
158 std::lock_guard<std::mutex>
lock{ _music_stream_mutex };
160 if (_music_stream) _music_stream((int16*)buffer, samples);
172 for (mc = _channels; mc !=
endof(_channels); mc++) {
175 mix_int16(mc, (int16*)buffer, samples, effect_vol);
177 mix_int8_to_int16(mc, (int16*)buffer, samples, effect_vol);
179 if (mc->samples_left == 0) MxCloseChannel(mc);
187 for (mc = _channels; mc !=
endof(_channels); mc++) {
190 mc->memory =
nullptr;
197 void MxSetChannelRawSrc(
MixerChannel *mc, int8 *mem,
size_t size, uint rate,
bool is16bit)
203 mc->frac_speed = (rate << 16) / _play_rate;
205 if (is16bit) size /= 2;
208 while (size >= _max_size) {
210 rate = (rate >> 1) + 1;
213 mc->samples_left = (uint)size * _play_rate / rate;
214 mc->is16bit = is16bit;
227 mc->volume_left = (uint)(sin((1.0 - pan) * M_PI / 2.0) * volume);
228 mc->volume_right = (uint)(sin(pan * M_PI / 2.0) * volume);
244 std::lock_guard<std::mutex>
lock{ _music_stream_mutex };
245 _music_stream = music_callback;
250 bool MxInitialize(uint rate)
252 std::lock_guard<std::mutex>
lock{ _music_stream_mutex };
254 _max_size = UINT_MAX / _play_rate;
255 _music_stream =
nullptr;