From b8fed490c275487f14bff4f5b49a6072d27e5b5f Mon Sep 17 00:00:00 2001
From: xegineering <me@xegineering.eu>
Date: Thu, 3 Oct 2024 19:16:56 +0200
Subject: Add soundbox.StreamURLContext()
This should be the primary public API of the library to stream web radio
to soundbox devices.
---
README.md | 4 +++-
example_test.go | 38 ++++++++++++++++++++++++++++++++++++++
stream.go | 40 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 81 insertions(+), 1 deletion(-)
create mode 100644 example_test.go
diff --git a/README.md b/README.md
index c9cbb06..1fc718d 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,11 @@
# soundbox-go
-[soundbox-go][1] is a Go library to interface with [soundbox][2] devices.
+[soundbox-go][1] is a Go library to interface with [soundbox][2] devices. It
+currently requires that the [ffmpeg][3] command line utility is installed.
While the repository and project name is `soundbox-go` the Go module name is
only `soundbox` to make the resulting code more readable.
[1]: https://xengineering.eu/git/soundbox-go
[2]: https://xengineering.eu/git/soundbox
+[3]: https://ffmpeg.org
diff --git a/example_test.go b/example_test.go
new file mode 100644
index 0000000..78b2f27
--- /dev/null
+++ b/example_test.go
@@ -0,0 +1,38 @@
+package soundbox_test
+
+import (
+ "context"
+ "log"
+ "net"
+ "time"
+
+ "xengineering.eu/soundbox"
+)
+
+func ExampleStreamURLContext() {
+ ctx, cancel := context.WithCancel(context.Background())
+
+ // all soundboxes are referenced by their MAC address
+ soundboxes := []net.HardwareAddr{
+ {0x00, 0x00, 0x5E, 0x00, 0x53, 0x01},
+ {0x00, 0x00, 0x5E, 0x00, 0x53, 0x02},
+ {0x00, 0x00, 0x5E, 0x00, 0x53, 0x03},
+ }
+
+ // currently only web radio is supported
+ url := "https://example.org/radio.mp3"
+
+ // start streaming
+ go func() {
+ err := soundbox.StreamURLContext(ctx, url, soundboxes)
+ if err != nil {
+ log.Fatal(err)
+ }
+ }()
+
+ // let it play for some time
+ time.Sleep(time.Minute)
+
+ // stop it
+ cancel()
+}
diff --git a/stream.go b/stream.go
index 38b3727..ac0a189 100644
--- a/stream.go
+++ b/stream.go
@@ -1,5 +1,45 @@
package soundbox
+import (
+ "context"
+ "fmt"
+ "os/exec"
+ "net"
+)
+
// streamingPort is the default network port a soundbox is listening to for
// incoming audio stream data.
const streamingPort = 5316
+
+func StreamURLContext(ctx context.Context, url string, targets []net.HardwareAddr) error {
+ iface, err := getInterface()
+ if err != nil {
+ return err
+ }
+
+ cmd := []string{
+ "-re",
+ "-i",
+ url,
+ }
+
+ for _, target := range targets {
+ ip, err := toLinkLocal(target)
+ if err != nil {
+ return err
+ }
+
+ cmd = append(cmd, "-acodec")
+ cmd = append(cmd, "flac")
+ cmd = append(cmd, "-f")
+ cmd = append(cmd, "ogg")
+ cmd = append(cmd, fmt.Sprintf(
+ "tcp://[%s%%%s]:%d",
+ ip,
+ iface.Name,
+ streamingPort,
+ ))
+ }
+
+ return exec.CommandContext(ctx, "ffmpeg", cmd...).Run()
+}
--
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