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Refactor audio subsystem
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,262 @@ | ||
| #include <math.h> | ||
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| #include "sts_mixer_mono.h" | ||
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| /////////////////////////////////////////////////////////////////////////////// | ||
| /////////////////////////////////////////////////////////////////////////////// | ||
| //// | ||
| //// IMPLEMENTATION | ||
| //// | ||
| //// | ||
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| static float sts_mixer__clamp(const float value, const float min, | ||
| const float max) { | ||
| if (value < min) | ||
| return min; | ||
| else if (value > max) | ||
| return max; | ||
| else | ||
| return value; | ||
| } | ||
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| static float sts_mixer__clamp_sample(const float sample) { | ||
| if (sample < -1.0f) | ||
| return -1.0f; | ||
| else if (sample > 1.0f) | ||
| return 1.0f; | ||
| else | ||
| return sample; | ||
| } | ||
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| static float sts_mixer__get_sample(sts_mixer_sample_t *sample, | ||
| unsigned int position) { | ||
| switch (sample->audio_format) { | ||
| case STS_MIXER_SAMPLE_FORMAT_8: | ||
| return (float)((char *)sample->data)[position] / 127.0f; | ||
| case STS_MIXER_SAMPLE_FORMAT_16: | ||
| return (float)((short *)sample->data)[position] / 32767.0f; | ||
| case STS_MIXER_SAMPLE_FORMAT_32: | ||
| return (float)((int *)sample->data)[position] / 2147483647.0f; | ||
| case STS_MIXER_SAMPLE_FORMAT_FLOAT: | ||
| return ((float *)sample->data)[position]; | ||
| default: | ||
| return 0.0f; | ||
| } | ||
| } | ||
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| static void sts_mixer__reset_voice(sts_mixer_t *mixer, const int i) { | ||
| sts_mixer_voice_t *voice = &mixer->voices[i]; | ||
| voice->state = STS_MIXER_VOICE_STOPPED; | ||
| voice->sample = 0; | ||
| voice->stream = 0; | ||
| voice->position = voice->gain = voice->pitch = voice->pan = 0.0f; | ||
| } | ||
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| static int sts_mixer__find_free_voice(sts_mixer_t *mixer) { | ||
| int i; | ||
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| for (i = 0; i < STS_MIXER_VOICES; ++i) { | ||
| if (mixer->voices[i].state == STS_MIXER_VOICE_STOPPED) | ||
| return i; | ||
| } | ||
| return -1; | ||
| } | ||
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| void sts_mixer_init(sts_mixer_t *mixer, unsigned int frequency, | ||
| int audio_format) { | ||
| int i; | ||
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| for (i = 0; i < STS_MIXER_VOICES; ++i) | ||
| sts_mixer__reset_voice(mixer, i); | ||
| mixer->frequency = frequency; | ||
| mixer->gain = 1.0f; | ||
| mixer->audio_format = audio_format; | ||
| mixer->enable_mono = 0; | ||
| } | ||
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| void sts_mixer_shutdown(sts_mixer_t *mixer) { sts_mixer_init(mixer, 0, 0); } | ||
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| int sts_mixer_get_active_voices(sts_mixer_t *mixer) { | ||
| int i, active; | ||
| for (i = 0, active = 0; i < STS_MIXER_VOICES; ++i) { | ||
| if (mixer->voices[i].state != STS_MIXER_VOICE_STOPPED) | ||
| ++active; | ||
| } | ||
| return active; | ||
| } | ||
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| int sts_mixer_play_sample(sts_mixer_t *mixer, sts_mixer_sample_t *sample, | ||
| float gain, float pitch, float pan) { | ||
| int i; | ||
| sts_mixer_voice_t *voice; | ||
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| i = sts_mixer__find_free_voice(mixer); | ||
| if (i >= 0) { | ||
| voice = &mixer->voices[i]; | ||
| voice->gain = gain; | ||
| voice->pitch = sts_mixer__clamp(pitch, 0.1f, 10.0f); | ||
| voice->pan = sts_mixer__clamp(pan * 0.5f, -0.5f, 0.5f); | ||
| voice->position = 0.0f; | ||
| voice->sample = sample; | ||
| voice->stream = 0; | ||
| voice->state = STS_MIXER_VOICE_PLAYING; | ||
| } | ||
| return i; | ||
| } | ||
|
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| int sts_mixer_play_stream(sts_mixer_t *mixer, sts_mixer_stream_t *stream, | ||
| float gain) { | ||
| int i; | ||
| sts_mixer_voice_t *voice; | ||
|
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| i = sts_mixer__find_free_voice(mixer); | ||
| if (i >= 0) { | ||
| voice = &mixer->voices[i]; | ||
| voice->gain = gain; | ||
| voice->position = 0.0f; | ||
| voice->sample = 0; | ||
| voice->stream = stream; | ||
| voice->state = STS_MIXER_VOICE_STREAMING; | ||
| } | ||
| return i; | ||
| } | ||
|
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| void sts_mixer_stop_voice(sts_mixer_t *mixer, int voice) { | ||
| if (voice >= 0 && voice < STS_MIXER_VOICES) | ||
| sts_mixer__reset_voice(mixer, voice); | ||
| } | ||
|
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| void sts_mixer_stop_sample(sts_mixer_t *mixer, sts_mixer_sample_t *sample) { | ||
| int i; | ||
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| for (i = 0; i < STS_MIXER_VOICES; ++i) { | ||
| if (mixer->voices[i].sample == sample) | ||
| sts_mixer__reset_voice(mixer, i); | ||
| } | ||
| } | ||
|
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| void sts_mixer_stop_stream(sts_mixer_t *mixer, sts_mixer_stream_t *stream) { | ||
| int i; | ||
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| for (i = 0; i < STS_MIXER_VOICES; ++i) { | ||
| if (mixer->voices[i].stream == stream) | ||
| sts_mixer__reset_voice(mixer, i); | ||
| } | ||
| } | ||
|
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| void sts_mixer_mix_audio(sts_mixer_t *mixer, void *output, | ||
| unsigned int samples) { | ||
| sts_mixer_voice_t *voice; | ||
| unsigned int i, position; | ||
| float left, right, advance, sample; | ||
| char *out_8 = (char *)output; | ||
| short *out_16 = (short *)output; | ||
| int *out_32 = (int *)output; | ||
| float *out_float = (float *)output; | ||
|
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| // mix all voices | ||
| advance = 1.0f / (float)mixer->frequency; | ||
| for (; samples > 0; --samples) { | ||
| left = 0.0f; | ||
| right = 0.0f; | ||
| for (i = 0; i < STS_MIXER_VOICES; ++i) { | ||
| voice = &mixer->voices[i]; | ||
| if (voice->state == STS_MIXER_VOICE_PLAYING) { | ||
| position = (int)voice->position; | ||
| if (position < voice->sample->length) { | ||
| sample = sts_mixer__clamp_sample( | ||
| sts_mixer__get_sample(voice->sample, position) * | ||
| voice->gain); | ||
| if (!mixer->enable_mono) { | ||
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| left += | ||
| sts_mixer__clamp_sample(sample * (0.5f - voice->pan)); | ||
| } | ||
| right += | ||
| sts_mixer__clamp_sample(sample * (0.5f + voice->pan)); | ||
| voice->position += (float)voice->sample->frequency * | ||
| advance * voice->pitch; | ||
| } else | ||
| sts_mixer__reset_voice(mixer, i); | ||
| } else if (voice->state == STS_MIXER_VOICE_STREAMING) { | ||
| position = ((int)voice->position) * 2; | ||
| if (position >= voice->stream->sample.length) { | ||
| // buffer empty...refill | ||
| voice->stream->callback(&voice->stream->sample, | ||
| voice->stream->userdata); | ||
| voice->position = 0.0f; | ||
| position = 0; | ||
| } | ||
| if (!mixer->enable_mono) { | ||
| left += sts_mixer__clamp_sample( | ||
| sts_mixer__get_sample(&voice->stream->sample, position) * | ||
| voice->gain); | ||
| } | ||
| right += sts_mixer__clamp_sample( | ||
| sts_mixer__get_sample(&voice->stream->sample, | ||
| position + 1) * | ||
| voice->gain); | ||
| voice->position += | ||
| (float)voice->stream->sample.frequency * advance; | ||
| } | ||
| } | ||
|
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| // write to buffer | ||
| if (!mixer->enable_mono) { | ||
| left = sts_mixer__clamp_sample(left); | ||
| } | ||
| right = sts_mixer__clamp_sample(right); | ||
| switch (mixer->audio_format) { | ||
| case STS_MIXER_SAMPLE_FORMAT_8: | ||
| if (!mixer->enable_mono) { | ||
| *out_8++ = (char)(left * 127.0f); | ||
| } | ||
| *out_8++ = (char)(right * 127.0f); | ||
| break; | ||
| case STS_MIXER_SAMPLE_FORMAT_16: | ||
| if (!mixer->enable_mono) { | ||
| *out_16++ = (short)(left * 32767.0f); | ||
| } | ||
| *out_16++ = (short)(right * 32767.0f); | ||
| break; | ||
| case STS_MIXER_SAMPLE_FORMAT_32: | ||
| if (!mixer->enable_mono) { | ||
| *out_32++ = (int)(left * 2147483647.0f); | ||
| } | ||
| *out_32++ = (int)(right * 2147483647.0f); | ||
| break; | ||
| case STS_MIXER_SAMPLE_FORMAT_FLOAT: | ||
| if (!mixer->enable_mono) { | ||
| *out_float++ = left; | ||
| } | ||
| *out_float++ = right; | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| /* | ||
| This is free and unencumbered software released into the public domain. | ||
| Anyone is free to copy, modify, publish, use, compile, sell, or | ||
| distribute this software, either in source code form or as a compiled | ||
| binary, for any purpose, commercial or non-commercial, and by any | ||
| means. | ||
| In jurisdictions that recognize copyright laws, the author or authors | ||
| of this software dedicate any and all copyright interest in the | ||
| software to the public domain. We make this dedication for the benefit | ||
| of the public at large and to the detriment of our heirs and | ||
| successors. We intend this dedication to be an overt act of | ||
| relinquishment in perpetuity of all present and future rights to this | ||
| software under copyright law. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | ||
| IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR | ||
| OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | ||
| ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | ||
| OTHER DEALINGS IN THE SOFTWARE. | ||
| For more information, please refer to <http://unlicense.org/> | ||
| */ |
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