Support Pulseaudio sink-inputs

inputs/pulseaudio/input.go

@@ -0,0 +1,112 @@
+package pa
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"os/exec"
+	"strconv"
+
+	"git.nemunai.re/nemunaire/hathoris/inputs"
+)
+
+type PulseaudioInput struct {
+}
+
+type PASink struct {
+	Index               int    `json:"index"`
+	Name                string `json:"name"`
+	Driver              string `json:"driver"`
+	SampleSpecification string `json:"sample_specifications"`
+	State               string `json:"state"`
+}
+
+type PAVolume struct {
+	Value        uint   `json:"value"`
+	ValuePercent string `json:"value_percent"`
+	DB           string `json:"db"`
+}
+
+type PASinkInput struct {
+	Index               int64               `json:"index"`
+	Driver              string              `json:"driver"`
+	OwnerModule         string              `json:"owner_module"`
+	Client              string              `json:"client"`
+	Sink                int                 `json:"sink"`
+	SampleSpecification string              `json:"sample_specifications"`
+	ChannelMap          string              `json:"channel_map"`
+	Format              string              `json:"format"`
+	Corked              bool                `json:"corked"`
+	Mute                bool                `json:"mute"`
+	Volume              map[string]PAVolume `json:"volume"`
+	Balance             float64             `json:"balance"`
+	BufferLatencyUsec   float64             `json:"buffer_latency_usec"`
+	SinkLatencyUsec     float64             `json:"sink_latency_usec"`
+	ResampleMethod      string              `json:"resample_method"`
+	Properties          map[string]string   `json:"properties"`
+}
+
+func init() {
+	cmd := exec.Command("pactl", "-f", "json", "list", "sinks", "short")
+	err := cmd.Run()
+	if err == nil {
+		inputs.SoundInputs["pulseaudio"] = &PulseaudioInput{}
+	} else {
+		log.Println("Unable to access pulseaudio:", err.Error())
+	}
+}
+
+func (s *PulseaudioInput) GetName() string {
+	return "pulseaudio"
+}
+
+func (s *PulseaudioInput) IsActive() bool {
+	cmd := exec.Command("pactl", "-f", "json", "list", "sinks", "short")
+	stdoutStderr, err := cmd.CombinedOutput()
+	if err != nil {
+		return false
+	}
+
+	var sinks []PASink
+	err = json.Unmarshal(stdoutStderr, &sinks)
+	if err != nil {
+		return false
+	}
+
+	for _, sink := range sinks {
+		if sink.State != "SUSPENDED" {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (s *PulseaudioInput) CurrentlyPlaying() map[string]string {
+	cmd := exec.Command("pactl", "-f", "json", "list", "sink-inputs")
+	stdoutStderr, err := cmd.CombinedOutput()
+	if err != nil {
+		log.Println("Unable to list sink-inputs:", err.Error())
+		return nil
+	}
+
+	var sinkinputs []PASinkInput
+	err = json.Unmarshal(stdoutStderr, &sinkinputs)
+	if err != nil {
+		log.Println("Unable to list sink-inputs:", err.Error())
+		return nil
+	}
+
+	ret := map[string]string{}
+	for _, input := range sinkinputs {
+		if v, ok := input.Properties["media.name"]; ok {
+			ret[strconv.FormatInt(input.Index, 10)] = v
+		} else if v, ok := input.Properties["device.description"]; ok {
+			ret[strconv.FormatInt(input.Index, 10)] = v
+		} else {
+			ret[strconv.FormatInt(input.Index, 10)] = fmt.Sprintf("#%d", input.Index)
+		}
+	}
+
+	return ret
+}