![](/media/cache/profiles/916954106a13204fa4909ae2d48e0602.jpg.50x50_q85.jpg)
aaaaaaaaa
player.cpp@0:6679ec22f0e5, 2019-11-10 (annotated)
- Committer:
- dicarloj
- Date:
- Sun Nov 10 23:19:38 2019 +0000
- Revision:
- 0:6679ec22f0e5
aaaaaaaaaaaaaaa
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
dicarloj | 0:6679ec22f0e5 | 1 | #include "player.h" |
dicarloj | 0:6679ec22f0e5 | 2 | |
dicarloj | 0:6679ec22f0e5 | 3 | #include <string.h> |
dicarloj | 0:6679ec22f0e5 | 4 | #include <math.h> |
dicarloj | 0:6679ec22f0e5 | 5 | #include <stdlib.h> |
dicarloj | 0:6679ec22f0e5 | 6 | |
dicarloj | 0:6679ec22f0e5 | 7 | Note* song = NULL; |
dicarloj | 0:6679ec22f0e5 | 8 | uint32_t songLength = 0; |
dicarloj | 0:6679ec22f0e5 | 9 | |
dicarloj | 0:6679ec22f0e5 | 10 | |
dicarloj | 0:6679ec22f0e5 | 11 | struct osc { |
dicarloj | 0:6679ec22f0e5 | 12 | uint32_t duration_remaining; |
dicarloj | 0:6679ec22f0e5 | 13 | uint16_t period; |
dicarloj | 0:6679ec22f0e5 | 14 | uint16_t on_time; |
dicarloj | 0:6679ec22f0e5 | 15 | }; |
dicarloj | 0:6679ec22f0e5 | 16 | |
dicarloj | 0:6679ec22f0e5 | 17 | static osc oscs[MAX_NOTES]; |
dicarloj | 0:6679ec22f0e5 | 18 | static osc* oscPool[MAX_NOTES]; |
dicarloj | 0:6679ec22f0e5 | 19 | static osc** oscPoolEnd; |
dicarloj | 0:6679ec22f0e5 | 20 | static osc** oscPoolPtr; |
dicarloj | 0:6679ec22f0e5 | 21 | static uint32_t now = 0; |
dicarloj | 0:6679ec22f0e5 | 22 | static uint32_t songPosition = 0; |
dicarloj | 0:6679ec22f0e5 | 23 | bool songDone = false; |
dicarloj | 0:6679ec22f0e5 | 24 | static uint32_t nextNoteTick = 0; |
dicarloj | 0:6679ec22f0e5 | 25 | static uint16_t frequencyTable[256]; |
dicarloj | 0:6679ec22f0e5 | 26 | static uint16_t periodTable[256]; |
dicarloj | 0:6679ec22f0e5 | 27 | static uint8_t nPlaying = 0; |
dicarloj | 0:6679ec22f0e5 | 28 | |
dicarloj | 0:6679ec22f0e5 | 29 | void initialize_play() { |
dicarloj | 0:6679ec22f0e5 | 30 | memset((void*)oscs,0,MAX_NOTES*sizeof(osc)); |
dicarloj | 0:6679ec22f0e5 | 31 | now = 0; |
dicarloj | 0:6679ec22f0e5 | 32 | songPosition = 0; |
dicarloj | 0:6679ec22f0e5 | 33 | songDone = false; |
dicarloj | 0:6679ec22f0e5 | 34 | nextNoteTick = song[0]._start_tick; |
dicarloj | 0:6679ec22f0e5 | 35 | nPlaying = 0; |
dicarloj | 0:6679ec22f0e5 | 36 | for(int i = 0; i < 256; i++) |
dicarloj | 0:6679ec22f0e5 | 37 | { |
dicarloj | 0:6679ec22f0e5 | 38 | float offset = 69; |
dicarloj | 0:6679ec22f0e5 | 39 | float f = 440.f * pow(2.f, (i - offset)/12.0f); |
dicarloj | 0:6679ec22f0e5 | 40 | float f2 = ((float)SAMPLE_FREQEUENCY) / f; |
dicarloj | 0:6679ec22f0e5 | 41 | frequencyTable[i] = 440*pow(2,(i - offset)/12.0f); |
dicarloj | 0:6679ec22f0e5 | 42 | periodTable[i] = ((uint32_t)f2) > 1 ? f2 : 1; |
dicarloj | 0:6679ec22f0e5 | 43 | //printf("period %d %d (%d Hz)\n", i, periodTable[i],frequencyTable[i]); |
dicarloj | 0:6679ec22f0e5 | 44 | } |
dicarloj | 0:6679ec22f0e5 | 45 | printf("Done initialize\n"); |
dicarloj | 0:6679ec22f0e5 | 46 | |
dicarloj | 0:6679ec22f0e5 | 47 | for(int i = 0; i < MAX_NOTES; i++) { |
dicarloj | 0:6679ec22f0e5 | 48 | oscPool[i] = oscs + i; |
dicarloj | 0:6679ec22f0e5 | 49 | } |
dicarloj | 0:6679ec22f0e5 | 50 | oscPoolEnd = oscPool + MAX_NOTES; |
dicarloj | 0:6679ec22f0e5 | 51 | oscPoolPtr = oscPool; |
dicarloj | 0:6679ec22f0e5 | 52 | } |
dicarloj | 0:6679ec22f0e5 | 53 | |
dicarloj | 0:6679ec22f0e5 | 54 | |
dicarloj | 0:6679ec22f0e5 | 55 | uint16_t play() { |
dicarloj | 0:6679ec22f0e5 | 56 | if(songDone) return 0; |
dicarloj | 0:6679ec22f0e5 | 57 | uint16_t isOn = 0; |
dicarloj | 0:6679ec22f0e5 | 58 | |
dicarloj | 0:6679ec22f0e5 | 59 | // play/end notes |
dicarloj | 0:6679ec22f0e5 | 60 | for(uint8_t i = 0; i < MAX_NOTES; i++) { |
dicarloj | 0:6679ec22f0e5 | 61 | osc* o = oscs + i; |
dicarloj | 0:6679ec22f0e5 | 62 | if(!o->duration_remaining) continue; |
dicarloj | 0:6679ec22f0e5 | 63 | |
dicarloj | 0:6679ec22f0e5 | 64 | // note is playing |
dicarloj | 0:6679ec22f0e5 | 65 | uint16_t progress = now % o->period; |
dicarloj | 0:6679ec22f0e5 | 66 | uint16_t effectiveOnTime = o->on_time / nPlaying; |
dicarloj | 0:6679ec22f0e5 | 67 | |
dicarloj | 0:6679ec22f0e5 | 68 | if(progress < effectiveOnTime) { |
dicarloj | 0:6679ec22f0e5 | 69 | isOn += 1; |
dicarloj | 0:6679ec22f0e5 | 70 | } |
dicarloj | 0:6679ec22f0e5 | 71 | |
dicarloj | 0:6679ec22f0e5 | 72 | if(o->duration_remaining == 1) { |
dicarloj | 0:6679ec22f0e5 | 73 | nPlaying--; |
dicarloj | 0:6679ec22f0e5 | 74 | *(--oscPoolPtr) = o; |
dicarloj | 0:6679ec22f0e5 | 75 | } |
dicarloj | 0:6679ec22f0e5 | 76 | o->duration_remaining--; |
dicarloj | 0:6679ec22f0e5 | 77 | } |
dicarloj | 0:6679ec22f0e5 | 78 | |
dicarloj | 0:6679ec22f0e5 | 79 | // avoids mod. |
dicarloj | 0:6679ec22f0e5 | 80 | if(!(now & (1 << CHEATER_FREQUENCY_MULT_POWER))) { |
dicarloj | 0:6679ec22f0e5 | 81 | // is there a new note? |
dicarloj | 0:6679ec22f0e5 | 82 | if(nextNoteTick <= (now >> CHEATER_FREQUENCY_MULT_POWER) && oscPoolPtr < oscPoolEnd) { |
dicarloj | 0:6679ec22f0e5 | 83 | // there is note to load right now, find an oscillator |
dicarloj | 0:6679ec22f0e5 | 84 | osc* o = *(oscPoolPtr++); |
dicarloj | 0:6679ec22f0e5 | 85 | |
dicarloj | 0:6679ec22f0e5 | 86 | if(!o) { |
dicarloj | 0:6679ec22f0e5 | 87 | printf("Too many notes! skipping...\n"); |
dicarloj | 0:6679ec22f0e5 | 88 | } else { |
dicarloj | 0:6679ec22f0e5 | 89 | Note* note = song + songPosition; |
dicarloj | 0:6679ec22f0e5 | 90 | o->duration_remaining = ((uint32_t)note->_duration) << CHEATER_FREQUENCY_MULT_POWER; |
dicarloj | 0:6679ec22f0e5 | 91 | o->period = periodTable[note->_note]; |
dicarloj | 0:6679ec22f0e5 | 92 | o->on_time = 5 + o->period / 20; |
dicarloj | 0:6679ec22f0e5 | 93 | nPlaying++; |
dicarloj | 0:6679ec22f0e5 | 94 | } |
dicarloj | 0:6679ec22f0e5 | 95 | |
dicarloj | 0:6679ec22f0e5 | 96 | // prepare for next note |
dicarloj | 0:6679ec22f0e5 | 97 | songPosition++; |
dicarloj | 0:6679ec22f0e5 | 98 | if(songPosition >= songLength) songDone = true; |
dicarloj | 0:6679ec22f0e5 | 99 | nextNoteTick = song[songPosition]._start_tick; |
dicarloj | 0:6679ec22f0e5 | 100 | } |
dicarloj | 0:6679ec22f0e5 | 101 | } |
dicarloj | 0:6679ec22f0e5 | 102 | |
dicarloj | 0:6679ec22f0e5 | 103 | |
dicarloj | 0:6679ec22f0e5 | 104 | now++; |
dicarloj | 0:6679ec22f0e5 | 105 | return isOn; |
dicarloj | 0:6679ec22f0e5 | 106 | } |