95 lines
2.2 KiB
C
Executable File
95 lines
2.2 KiB
C
Executable File
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#include "mixer.h"
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#include "sys.h"
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#include "util.h"
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#include <libmodplug/modplug.h>
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struct mixerchannel_t {
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const uint8_t *data;
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uint32_t pos;
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uint32_t step;
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uint32_t size;
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mix_repeat_sound_cb repeat_cb;
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};
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static const int _rate = SYS_AUDIO_FREQ;
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static struct mixerchannel_t _channel;
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static ModPlugFile *_mpf;
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static void mix(void *param, uint8_t *buf, int len) {
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memset(buf, 0, len);
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if (_mpf) {
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const int count = ModPlug_Read(_mpf, buf, len);
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if (count == 0) {
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ModPlug_SeekOrder(_mpf, 0);
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}
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}
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if (_channel.data) {
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for (int i = 0; i < len; i += sizeof(int16_t)) {
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int pos = _channel.pos >> 16;
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if (pos >= _channel.size) {
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_channel.data = 0;
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if (_channel.repeat_cb) {
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_channel.repeat_cb(&_channel.data, &_channel.size);
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}
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if (!_channel.data) {
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break;
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}
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_channel.pos = pos = 0;
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}
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const int sample = *(int16_t *)(buf + i) + ((int8_t)_channel.data[pos]) * 256;
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*(int16_t *)(buf + i) = (sample < -32768 ? -32768 : (sample > 32767 ? 32767 : sample));
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_channel.pos += _channel.step;
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}
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}
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}
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static void mixer_init() {
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ModPlug_Settings mp_settings;
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memset(&mp_settings, 0, sizeof(mp_settings));
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ModPlug_GetSettings(&mp_settings);
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mp_settings.mFlags = MODPLUG_ENABLE_OVERSAMPLING | MODPLUG_ENABLE_NOISE_REDUCTION;
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mp_settings.mChannels = 1;
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mp_settings.mBits = 16;
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mp_settings.mFrequency = _rate;
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mp_settings.mResamplingMode = MODPLUG_RESAMPLE_FIR;
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mp_settings.mLoopCount = -1;
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ModPlug_SetSettings(&mp_settings);
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g_sys.start_audio(mix, 0);
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}
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static void mixer_fini() {
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g_sys.stop_audio();
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}
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static void play_sound(const uint8_t *data, uint32_t size, int freq, mix_repeat_sound_cb repeat_cb) {
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g_sys.lock_audio();
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_channel.data = data;
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_channel.pos = 0;
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_channel.step = (freq << 16) / _rate;
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_channel.size = size;
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_channel.repeat_cb = repeat_cb;
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g_sys.unlock_audio();
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}
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static void play_music(const uint8_t *data, uint32_t size) {
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g_sys.lock_audio();
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if (_mpf) {
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ModPlug_Unload(_mpf);
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_mpf = 0;
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}
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_mpf = ModPlug_Load(data, size);
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if (_mpf) {
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print_debug(DBG_MIXER, "Loaded module '%s'", ModPlug_GetName(_mpf));
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}
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g_sys.unlock_audio();
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}
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struct mixer_t g_mix = {
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.init = mixer_init,
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.fini = mixer_fini,
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.play_sound = play_sound,
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.play_music = play_music,
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};
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