internal/pipewire: store sample iovec continuously

This removes the need for manual splitting. The understanding of the format is robust enough to allow this to happen anyway.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pipewire/pipewire_test.go

@@ -2,60 +2,58 @@ package pipewire_test
 
 import (
 	_ "embed"
+	"encoding/binary"
+
+	"hakurei.app/internal/pipewire"
 )
 
 var (
-	//go:embed testdata/c0s0p0
-	c0s0header string
-	//go:embed testdata/c0s0p1
-	c0s0pod string
+	//go:embed testdata/pw-container-00-sendmsg
+	samplePWContainer00 string
+	//go:embed testdata/pw-container-01-recvmsg
+	samplePWContainer01 string
+	//go:embed testdata/pw-container-03-sendmsg
+	samplePWContainer03 string
+	//go:embed testdata/pw-container-04-recvmsg
+	samplePWContainer04 string
+	//go:embed testdata/pw-container-06-sendmsg
+	samplePWContainer06 string
+	//go:embed testdata/pw-container-07-recvmsg
+	samplePWContainer07 string
 
-	//go:embed testdata/c0s1p0
-	c0s1header string
-	//go:embed testdata/c0s1p1
-	c0s1pod string
-
-	//go:embed testdata/c0s2p0
-	c0s2header string
-	//go:embed testdata/c0s2p1
-	c0s2pod string
-
-	//go:embed testdata/c0s3p0
-	c0s3header string
-	//go:embed testdata/c0s3p1
-	c0s3pod string
-
-	//go:embed testdata/c1r0p0
-	c1r0header string
-	//go:embed testdata/c1r0p1
-	c1r0pod string
-	//go:embed testdata/c1r0p2
-	c1r0footer string
-
-	//go:embed testdata/c1r1p0
-	c1r1header string
-	//go:embed testdata/c1r1p1
-	c1r1pod string
-
-	//go:embed testdata/c1r2p0
-	c1r2header string
-	//go:embed testdata/c1r2p1
-	c1r2pod string
-
-	//go:embed testdata/c1r3p0
-	c1r3header string
-	//go:embed testdata/c1r3p1
-	c1r3pod string
-
-	//go:embed testdata/c1r4p0
-	c1r4header string
-	//go:embed testdata/c1r4p1
-	c1r4pod string
-
-	//go:embed testdata/c1r5p0
-	c1r5header string
-	//go:embed testdata/c1r5p1
-	c1r5pod string
-	//go:embed testdata/c1r5p2
-	c1r5footer string
+	// samplePWContainer is a collection of messages from the pw-container sample.
+	samplePWContainer = [...][][3][]byte{
+		splitMessages(samplePWContainer00),
+		splitMessages(samplePWContainer01),
+		nil,
+		splitMessages(samplePWContainer03),
+		splitMessages(samplePWContainer04),
+		nil,
+		splitMessages(samplePWContainer06),
+		splitMessages(samplePWContainer07),
+		nil,
+	}
 )
+
+// splitMessages splits concatenated messages into groups of
+// header, payload, footer of each individual message.
+// splitMessages panics on any decoding error.
+func splitMessages(iovec string) (messages [][3][]byte) {
+	data := []byte(iovec)
+	messages = make([][3][]byte, 0, 1<<7)
+
+	var header pipewire.Header
+	for len(data) != 0 {
+		if err := header.UnmarshalBinary(data[:pipewire.SizeHeader]); err != nil {
+			panic(err)
+		}
+		size := pipewire.SizePrefix + binary.NativeEndian.Uint32(data[pipewire.SizeHeader:])
+		messages = append(messages, [3][]byte{
+			data[:pipewire.SizeHeader],
+			data[pipewire.SizeHeader : pipewire.SizeHeader+size],
+			data[pipewire.SizeHeader+size : pipewire.SizeHeader+header.Size],
+		})
+		data = data[pipewire.SizeHeader+header.Size:]
+	}
+	return
+}