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sequencer.go
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sequencer.go
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package definitions
import (
"fmt"
"io/ioutil"
"path/filepath"
"github.com/bspaans/bleep/channels"
. "github.com/bspaans/bleep/sequencer/sequences"
"github.com/bspaans/bleep/util"
"gopkg.in/yaml.v2"
)
type SequencerDef struct {
BPM float64 `json:"bpm" yaml:"bpm"`
Granularity int `json:"granularity" yaml:"granularity"`
Sequences []SequenceDef `json:"sequences" yaml:"sequences"`
Tracks []TrackDef `json:"tracks" yaml:"tracks"`
channels.ChannelsDef `json:",inline" yaml:",inline"`
FromFile string `json:"-" yaml:"-"`
}
type context struct {
BaseDir string
Granularity int
}
func (s *SequencerDef) getBaseDir() (string, error) {
if s.FromFile != "" {
fp, err := filepath.Abs(s.FromFile)
if err != nil {
return "", err
}
return filepath.Dir(fp), nil
}
return ".", nil
}
func (s *SequencerDef) GetSequences() ([]Sequence, error) {
baseDir, err := s.getBaseDir()
if err != nil {
return nil, err
}
sequences := []Sequence{}
ctx := &context{
BaseDir: baseDir,
Granularity: s.Granularity,
}
for i, se := range s.Sequences {
sequence, err := se.GetSequence(ctx)
if err != nil {
return nil, util.WrapError(fmt.Sprintf("sequence [%d]", i), err)
}
sequences = append(sequences, sequence)
}
for i, tr := range s.Tracks {
for j, seq := range tr.Sequences {
sequence, err := seq.GetSequence(ctx)
if err != nil {
return nil, util.WrapError(fmt.Sprintf("tracks [%d] -> sequences [%d]", i, j), err)
}
sequences = append(sequences, sequence)
}
}
return sequences, nil
}
func (s *SequencerDef) YAML() (string, error) {
b, err := yaml.Marshal(s)
if err != nil {
return "", err
}
return string(b), nil
}
func NewSequencerDefFromFile(file string) (*SequencerDef, error) {
contents, err := ioutil.ReadFile(file)
if err != nil {
return nil, err
}
result := SequencerDef{}
if err := yaml.Unmarshal(contents, &result); err != nil {
return nil, err
}
if len(result.Sequences) == 0 {
return nil, fmt.Errorf("No sequences in sequencer def %s", file)
}
result.FromFile = file
return &result, nil
}