Big Mouth Billy Bass automation library
player.hpp@4:f009306756b3, 2013-06-18 (annotated)
- Committer:
- bikeNomad
- Date:
- Tue Jun 18 14:10:34 2013 +0000
- Revision:
- 4:f009306756b3
- Parent:
- 3:6c91a6232c4a
- Child:
- 6:ea8136eb6976
working. re-used one Song for memory reduction.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bikeNomad | 0:84aaade0de8f | 1 | #ifndef __included_player_hpp |
bikeNomad | 0:84aaade0de8f | 2 | #define __included_player_hpp |
bikeNomad | 0:84aaade0de8f | 3 | |
bikeNomad | 0:84aaade0de8f | 4 | #include "billybass.hpp" |
bikeNomad | 0:84aaade0de8f | 5 | |
bikeNomad | 3:6c91a6232c4a | 6 | extern AnalogOut speaker; |
bikeNomad | 3:6c91a6232c4a | 7 | |
bikeNomad | 0:84aaade0de8f | 8 | class SongPlayer; |
bikeNomad | 0:84aaade0de8f | 9 | |
bikeNomad | 2:eaba75af0f0d | 10 | struct SampleBuffer { |
bikeNomad | 0:84aaade0de8f | 11 | Sample_t volatile buf[ SAMPLES_PER_BUFFER ]; |
bikeNomad | 0:84aaade0de8f | 12 | size_t volatile samplesRemaining; |
bikeNomad | 0:84aaade0de8f | 13 | Sample_t volatile * volatile nextSample; |
bikeNomad | 0:84aaade0de8f | 14 | |
bikeNomad | 2:eaba75af0f0d | 15 | bool isDone() { |
bikeNomad | 0:84aaade0de8f | 16 | return !samplesRemaining; |
bikeNomad | 0:84aaade0de8f | 17 | } |
bikeNomad | 0:84aaade0de8f | 18 | |
bikeNomad | 2:eaba75af0f0d | 19 | float remainingDuration() { |
bikeNomad | 0:84aaade0de8f | 20 | return samplesRemaining / SAMPLE_RATE_HZ; |
bikeNomad | 0:84aaade0de8f | 21 | } |
bikeNomad | 0:84aaade0de8f | 22 | |
bikeNomad | 0:84aaade0de8f | 23 | // return true if we read any samples |
bikeNomad | 2:eaba75af0f0d | 24 | bool loadFrom(FILE *fp) { |
bikeNomad | 0:84aaade0de8f | 25 | samplesRemaining = fread((void*)buf, sizeof(Sample_t), SAMPLES_PER_BUFFER, fp); |
bikeNomad | 0:84aaade0de8f | 26 | nextSample = buf; |
bikeNomad | 0:84aaade0de8f | 27 | return samplesRemaining > 0; |
bikeNomad | 0:84aaade0de8f | 28 | } |
bikeNomad | 0:84aaade0de8f | 29 | |
bikeNomad | 2:eaba75af0f0d | 30 | Sample_t getNextSample() { |
bikeNomad | 0:84aaade0de8f | 31 | --samplesRemaining; |
bikeNomad | 0:84aaade0de8f | 32 | return *++nextSample; |
bikeNomad | 0:84aaade0de8f | 33 | } |
bikeNomad | 0:84aaade0de8f | 34 | |
bikeNomad | 0:84aaade0de8f | 35 | SampleBuffer() : samplesRemaining(0) |
bikeNomad | 0:84aaade0de8f | 36 | , nextSample(buf) { |
bikeNomad | 0:84aaade0de8f | 37 | } |
bikeNomad | 0:84aaade0de8f | 38 | }; |
bikeNomad | 0:84aaade0de8f | 39 | |
bikeNomad | 2:eaba75af0f0d | 40 | struct SongPlayer { |
bikeNomad | 0:84aaade0de8f | 41 | SampleBuffer * volatile playing; |
bikeNomad | 0:84aaade0de8f | 42 | SampleBuffer * volatile loading; |
bikeNomad | 0:84aaade0de8f | 43 | SampleBuffer buffer[2]; |
bikeNomad | 0:84aaade0de8f | 44 | FILE *fp; |
bikeNomad | 0:84aaade0de8f | 45 | size_t nChunks; |
bikeNomad | 0:84aaade0de8f | 46 | size_t volatile chunksRemaining; |
bikeNomad | 0:84aaade0de8f | 47 | float timeInSong; |
bikeNomad | 0:84aaade0de8f | 48 | Ticker sampleTicker; |
bikeNomad | 2:eaba75af0f0d | 49 | Song *song; |
bikeNomad | 4:f009306756b3 | 50 | Action *nextAction; |
bikeNomad | 2:eaba75af0f0d | 51 | unsigned actionsDone; |
bikeNomad | 0:84aaade0de8f | 52 | |
bikeNomad | 0:84aaade0de8f | 53 | SongPlayer() : playing(0) |
bikeNomad | 0:84aaade0de8f | 54 | , loading(0) |
bikeNomad | 0:84aaade0de8f | 55 | , fp(0) |
bikeNomad | 0:84aaade0de8f | 56 | , nChunks(0) |
bikeNomad | 0:84aaade0de8f | 57 | , chunksRemaining(0) |
bikeNomad | 2:eaba75af0f0d | 58 | , song(0) |
bikeNomad | 3:6c91a6232c4a | 59 | , actionsDone(0) { |
bikeNomad | 0:84aaade0de8f | 60 | } |
bikeNomad | 0:84aaade0de8f | 61 | |
bikeNomad | 0:84aaade0de8f | 62 | // interrupt handler |
bikeNomad | 2:eaba75af0f0d | 63 | void playNextSample(void) { |
bikeNomad | 0:84aaade0de8f | 64 | if (playing->samplesRemaining == 0) |
bikeNomad | 0:84aaade0de8f | 65 | swapBuffers(); |
bikeNomad | 0:84aaade0de8f | 66 | // NOTE bias of 0xC000 requires normalizing to 75% of full scale |
bikeNomad | 3:6c91a6232c4a | 67 | speaker.write_u16(static_cast<uint16_t>(playing->getNextSample() + ANALOG_OUTPUT_BIAS)); |
bikeNomad | 0:84aaade0de8f | 68 | } |
bikeNomad | 0:84aaade0de8f | 69 | |
bikeNomad | 2:eaba75af0f0d | 70 | bool startSong(Song *_song) { |
bikeNomad | 2:eaba75af0f0d | 71 | song = _song; |
bikeNomad | 4:f009306756b3 | 72 | nextAction = song->getActions(); |
bikeNomad | 2:eaba75af0f0d | 73 | timeInSong = 0.0; |
bikeNomad | 2:eaba75af0f0d | 74 | actionsDone = 0; |
bikeNomad | 2:eaba75af0f0d | 75 | |
bikeNomad | 3:6c91a6232c4a | 76 | fprintf(stderr, "starting %s: ", song->getSampleFileName()); |
bikeNomad | 0:84aaade0de8f | 77 | if (fp) fclose(fp); |
bikeNomad | 2:eaba75af0f0d | 78 | fp = fopen(song->getSampleFileName(), "rb"); |
bikeNomad | 4:f009306756b3 | 79 | if (!fp) goto on_error; |
bikeNomad | 3:6c91a6232c4a | 80 | fprintf(stderr, "opened, "); |
bikeNomad | 0:84aaade0de8f | 81 | |
bikeNomad | 4:f009306756b3 | 82 | if (fseek(fp, 0, SEEK_END)) goto on_error; |
bikeNomad | 3:6c91a6232c4a | 83 | fprintf(stderr, "seekend, "); |
bikeNomad | 0:84aaade0de8f | 84 | |
bikeNomad | 0:84aaade0de8f | 85 | long fileSize = ftell(fp); |
bikeNomad | 3:6c91a6232c4a | 86 | fprintf(stderr, "size=%d, ", fileSize); |
bikeNomad | 4:f009306756b3 | 87 | if (fileSize < 0) goto on_error; |
bikeNomad | 0:84aaade0de8f | 88 | |
bikeNomad | 4:f009306756b3 | 89 | if (fseek(fp, 0, SEEK_SET)) goto on_error; |
bikeNomad | 0:84aaade0de8f | 90 | |
bikeNomad | 3:6c91a6232c4a | 91 | fprintf(stderr, "rewound, "); |
bikeNomad | 0:84aaade0de8f | 92 | chunksRemaining = nChunks = fileSize / BUFFER_SIZE; |
bikeNomad | 0:84aaade0de8f | 93 | loading = &buffer[0]; |
bikeNomad | 0:84aaade0de8f | 94 | playing = &buffer[1]; |
bikeNomad | 3:6c91a6232c4a | 95 | fprintf(stderr, "chunks=%d expected=%f seconds\r\n", nChunks, nChunks * SECONDS_PER_CHUNK); |
bikeNomad | 3:6c91a6232c4a | 96 | if (!loadNextChunk()) { |
bikeNomad | 3:6c91a6232c4a | 97 | fprintf(stderr, "first chunk empty!\r\n"); |
bikeNomad | 4:f009306756b3 | 98 | goto on_error; |
bikeNomad | 3:6c91a6232c4a | 99 | } |
bikeNomad | 2:eaba75af0f0d | 100 | |
bikeNomad | 0:84aaade0de8f | 101 | sampleTicker.attach_us(this, &SongPlayer::playNextSample, SAMPLE_PERIOD_USEC); |
bikeNomad | 0:84aaade0de8f | 102 | return true; |
bikeNomad | 4:f009306756b3 | 103 | |
bikeNomad | 4:f009306756b3 | 104 | on_error: |
bikeNomad | 4:f009306756b3 | 105 | if (fp) fclose(fp); |
bikeNomad | 4:f009306756b3 | 106 | fp = 0; |
bikeNomad | 4:f009306756b3 | 107 | return false; |
bikeNomad | 0:84aaade0de8f | 108 | } |
bikeNomad | 0:84aaade0de8f | 109 | |
bikeNomad | 0:84aaade0de8f | 110 | // swap loading/playing buffers; |
bikeNomad | 0:84aaade0de8f | 111 | // decrement chunksRemaining |
bikeNomad | 2:eaba75af0f0d | 112 | void swapBuffers() { |
bikeNomad | 0:84aaade0de8f | 113 | SampleBuffer * volatile tmp = playing; |
bikeNomad | 0:84aaade0de8f | 114 | if (tmp == buffer + 0) |
bikeNomad | 0:84aaade0de8f | 115 | playing = buffer + 1; |
bikeNomad | 0:84aaade0de8f | 116 | else |
bikeNomad | 0:84aaade0de8f | 117 | playing = buffer + 0; |
bikeNomad | 0:84aaade0de8f | 118 | loading = tmp; |
bikeNomad | 0:84aaade0de8f | 119 | if (chunksRemaining) |
bikeNomad | 0:84aaade0de8f | 120 | chunksRemaining--; |
bikeNomad | 0:84aaade0de8f | 121 | } |
bikeNomad | 0:84aaade0de8f | 122 | |
bikeNomad | 0:84aaade0de8f | 123 | // get next chunk of file into *loading |
bikeNomad | 0:84aaade0de8f | 124 | // to prepare for eventual swap. |
bikeNomad | 0:84aaade0de8f | 125 | // returns true if more samples remain |
bikeNomad | 2:eaba75af0f0d | 126 | bool loadNextChunk() { |
bikeNomad | 3:6c91a6232c4a | 127 | if (isDone()) |
bikeNomad | 3:6c91a6232c4a | 128 | return false; |
bikeNomad | 0:84aaade0de8f | 129 | bool notDone = loading->loadFrom(fp); |
bikeNomad | 0:84aaade0de8f | 130 | return notDone; |
bikeNomad | 0:84aaade0de8f | 131 | } |
bikeNomad | 0:84aaade0de8f | 132 | |
bikeNomad | 2:eaba75af0f0d | 133 | bool isDone() { |
bikeNomad | 0:84aaade0de8f | 134 | return !chunksRemaining; |
bikeNomad | 0:84aaade0de8f | 135 | } |
bikeNomad | 0:84aaade0de8f | 136 | |
bikeNomad | 0:84aaade0de8f | 137 | // look at loading buffer; load only if necessary. |
bikeNomad | 2:eaba75af0f0d | 138 | bool loadIfNecessary() { |
bikeNomad | 2:eaba75af0f0d | 139 | if (loading->isDone()) { |
bikeNomad | 4:f009306756b3 | 140 | fprintf(stderr, "*"); |
bikeNomad | 0:84aaade0de8f | 141 | timeInSong += SECONDS_PER_CHUNK; |
bikeNomad | 0:84aaade0de8f | 142 | return loadNextChunk(); |
bikeNomad | 2:eaba75af0f0d | 143 | } else { |
bikeNomad | 2:eaba75af0f0d | 144 | return true; |
bikeNomad | 0:84aaade0de8f | 145 | } |
bikeNomad | 0:84aaade0de8f | 146 | } |
bikeNomad | 0:84aaade0de8f | 147 | |
bikeNomad | 2:eaba75af0f0d | 148 | void playEntireSong(Song *_song) { |
bikeNomad | 2:eaba75af0f0d | 149 | if (!startSong(_song)) return; |
bikeNomad | 4:f009306756b3 | 150 | Action* lastAction = song->getActions() + song->getNumActions(); |
bikeNomad | 2:eaba75af0f0d | 151 | while (!isDone()) { |
bikeNomad | 4:f009306756b3 | 152 | while (nextAction < lastAction && nextAction->actIfPast(timeInSong)) { |
bikeNomad | 4:f009306756b3 | 153 | fprintf(stderr, "."); |
bikeNomad | 2:eaba75af0f0d | 154 | actionsDone++; |
bikeNomad | 2:eaba75af0f0d | 155 | nextAction++; |
bikeNomad | 2:eaba75af0f0d | 156 | } |
bikeNomad | 0:84aaade0de8f | 157 | loadIfNecessary(); |
bikeNomad | 0:84aaade0de8f | 158 | } |
bikeNomad | 0:84aaade0de8f | 159 | sampleTicker.detach(); |
bikeNomad | 3:6c91a6232c4a | 160 | song->myFish()->relax(); |
bikeNomad | 0:84aaade0de8f | 161 | } |
bikeNomad | 0:84aaade0de8f | 162 | }; |
bikeNomad | 0:84aaade0de8f | 163 | |
bikeNomad | 0:84aaade0de8f | 164 | #endif |