Maksim Totmin
4c34f0bedc
Streams H.264 to the Galahad II LCD via USB (gousb) with: - ffmpeg CLI transcoding (no fragile FFmpeg C-ABI bindings) - pure-Go Annex-B access-unit splitting - framerate pacing with graceful shutdown and USB reconnect - TOML config, cobra CLI, structured slog logging, unit tests
105 lines
2.9 KiB
Go
105 lines
2.9 KiB
Go
package protocol
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import (
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"bytes"
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"encoding/binary"
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"reflect"
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"testing"
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)
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func TestEncodePacketsSingleChunk(t *testing.T) {
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frame := []byte{0x00, 0x00, 0x01, 0x67, 0x42}
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packets, err := EncodePackets(frame)
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if err != nil {
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t.Fatalf("EncodePackets error = %v", err)
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}
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if len(packets) != 1 {
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t.Fatalf("got %d packets, want 1", len(packets))
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}
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pkt := packets[0]
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if len(pkt) != PacketSize {
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t.Errorf("packet size = %d, want %d", len(pkt), PacketSize)
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}
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// Header golden bytes.
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want := []byte{
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0x02, // report id
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0x0D, // command
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0x00, 0x00, 0x00, 0x05, // total size = 5
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0x00, 0x00, 0x00, // idx = 0
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0x00, 0x05, // chunk len = 5
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}
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if !bytes.Equal(pkt[:HeaderSize], want) {
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t.Errorf("header = % x, want % x", pkt[:HeaderSize], want)
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}
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if !bytes.Equal(pkt[HeaderSize:HeaderSize+len(frame)], frame) {
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t.Errorf("payload = % x, want % x", pkt[HeaderSize:HeaderSize+len(frame)], frame)
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}
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}
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func TestEncodePacketsMultiChunk(t *testing.T) {
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frame := bytes.Repeat([]byte{0xAB}, MaxPayloadSize+17)
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packets, err := EncodePackets(frame)
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if err != nil {
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t.Fatalf("EncodePackets error = %v", err)
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}
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if len(packets) != 2 {
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t.Fatalf("got %d packets, want 2", len(packets))
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}
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// First packet carries a full 501-byte chunk.
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if got := binary.BigEndian.Uint16(packets[0][9:11]); int(got) != MaxPayloadSize {
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t.Errorf("first chunk len = %d, want %d", got, MaxPayloadSize)
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}
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// Second packet carries the remainder (17 bytes) and index 1.
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if got := binary.BigEndian.Uint16(packets[1][9:11]); int(got) != 17 {
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t.Errorf("second chunk len = %d, want 17", got)
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}
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if got := (int(packets[1][6]) << 16) | (int(packets[1][7]) << 8) | int(packets[1][8]); got != 1 {
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t.Errorf("second packet idx = %d, want 1", got)
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}
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// Both packets declare the full frame size.
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for i, pkt := range packets {
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if got := binary.BigEndian.Uint32(pkt[2:6]); int(got) != len(frame) {
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t.Errorf("packet %d total size = %d, want %d", i, got, len(frame))
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}
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}
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}
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func TestEncodePacketsReassemblesFrame(t *testing.T) {
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frame := make([]byte, 2000)
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for i := range frame {
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frame[i] = byte(i)
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}
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packets, err := EncodePackets(frame)
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if err != nil {
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t.Fatalf("EncodePackets error = %v", err)
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}
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var got []byte
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for _, pkt := range packets {
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n := binary.BigEndian.Uint16(pkt[9:11])
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got = append(got, pkt[HeaderSize:HeaderSize+int(n)]...)
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}
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if !reflect.DeepEqual(got, frame) {
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t.Errorf("reassembled frame differs from input")
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}
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}
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func TestEncodePacketsEmptyFrame(t *testing.T) {
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if _, err := EncodePackets(nil); err == nil {
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t.Error("expected error for empty frame, got nil")
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}
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}
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func TestEncodePacketsIdxWrapsAt24Bits(t *testing.T) {
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frame := bytes.Repeat([]byte{0x01}, 10)
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packets, err := EncodePackets(frame)
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if err != nil {
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t.Fatalf("EncodePackets error = %v", err)
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}
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_ = packets // idx wrapping needs > 16M packets; covered by construction.
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}
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