|
| 1 | +package p8 |
| 2 | + |
| 3 | +import ( |
| 4 | + "bufio" |
| 5 | + "fmt" |
| 6 | + "io" |
| 7 | + "os" |
| 8 | + "strconv" |
| 9 | + "strings" |
| 10 | + |
| 11 | + "github.com/elgopher/pi/audio" |
| 12 | +) |
| 13 | + |
| 14 | +func ConvertToAudioSfx(inputFile, outputFile string) error { |
| 15 | + p8file, err := Load(inputFile) |
| 16 | + if err != nil { |
| 17 | + return fmt.Errorf("loading p8 file failed: %w", err) |
| 18 | + } |
| 19 | + |
| 20 | + effects, err := p8file.SoundEffects() |
| 21 | + if err != nil { |
| 22 | + return fmt.Errorf("loading sound effects failed: %w", err) |
| 23 | + } |
| 24 | + audio.Sfx = effects |
| 25 | + |
| 26 | + patterns, err := p8file.MusicPatterns() |
| 27 | + if err != nil { |
| 28 | + return fmt.Errorf("loading music patterns failed: %w", err) |
| 29 | + } |
| 30 | + audio.Pat = patterns |
| 31 | + |
| 32 | + bytes, err := audio.Save() |
| 33 | + if err != nil { |
| 34 | + return fmt.Errorf("saving audio failed: %w", err) |
| 35 | + } |
| 36 | + |
| 37 | + err = os.WriteFile(outputFile, bytes, 0644) |
| 38 | + if err != nil { |
| 39 | + return fmt.Errorf("writing %s failed: %w", outputFile, err) |
| 40 | + } |
| 41 | + |
| 42 | + return nil |
| 43 | +} |
| 44 | + |
| 45 | +func Load(filename string) (*File, error) { |
| 46 | + file := &File{} |
| 47 | + |
| 48 | + f, err := os.Open(filename) |
| 49 | + if err != nil { |
| 50 | + return nil, fmt.Errorf("opening %s file failed: %w", filename, err) |
| 51 | + } |
| 52 | + |
| 53 | + reader := bufio.NewReader(f) |
| 54 | + _, err = readHeader(reader) |
| 55 | + if err != nil { |
| 56 | + return nil, err |
| 57 | + } |
| 58 | + |
| 59 | + for { |
| 60 | + err = file.readSection(reader) |
| 61 | + if err == io.EOF { |
| 62 | + return file, nil |
| 63 | + } |
| 64 | + } |
| 65 | +} |
| 66 | + |
| 67 | +func readHeader(r *bufio.Reader) (version int, err error) { |
| 68 | + firstLine, err := r.ReadString('\n') |
| 69 | + if err != nil { |
| 70 | + return 0, fmt.Errorf("error reading first line from p8 file header: %w", err) |
| 71 | + } |
| 72 | + |
| 73 | + if firstLine != "pico-8 cartridge // http://www.pico-8.com" { |
| 74 | + return 0, fmt.Errorf("input file is not p8 cartridge file. Header expected") |
| 75 | + } |
| 76 | + |
| 77 | + versionLine, err := r.ReadString('\n') |
| 78 | + if !strings.HasPrefix(versionLine, "version ") { |
| 79 | + return 0, fmt.Errorf("input file is not p8 cartridge file. Version in header expected, but not found") |
| 80 | + } |
| 81 | + |
| 82 | + versionString := strings.SplitN(versionLine, " ", 2)[1] |
| 83 | + |
| 84 | + version, err = strconv.Atoi(versionString) |
| 85 | + if err != nil { |
| 86 | + return 0, fmt.Errorf("input file is not p8 cartridge file. Version number in header expected, but found %s", versionString) |
| 87 | + } |
| 88 | + |
| 89 | + return version, nil |
| 90 | +} |
| 91 | + |
| 92 | +type File struct { |
| 93 | +} |
| 94 | + |
| 95 | +func (p *File) readSection(reader *bufio.Reader) error { |
| 96 | + sectionName, err := reader.ReadString('\n') |
| 97 | + if err != nil { |
| 98 | + return err |
| 99 | + } |
| 100 | + |
| 101 | + fmt.Println(sectionName) |
| 102 | + |
| 103 | + return nil |
| 104 | +} |
| 105 | + |
| 106 | +func (p *File) SoundEffects() ([64]audio.SoundEffect, error) { |
| 107 | + return [64]audio.SoundEffect{}, nil |
| 108 | +} |
| 109 | + |
| 110 | +func (p *File) MusicPatterns() ([64]audio.Pattern, error) { |
| 111 | + return [64]audio.Pattern{}, nil |
| 112 | +} |
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