mirror of https://bitbucket.org/ausocean/av.git
267 lines
6.6 KiB
Go
267 lines
6.6 KiB
Go
/*
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NAME
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mpegts_test.go
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DESCRIPTION
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mpegts_test.go contains testing for functionality found in mpegts.go.
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AUTHORS
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Saxon A. Nelson-Milton <saxon@ausocean.org>
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LICENSE
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Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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in gpl.txt. If not, see http://www.gnu.org/licenses.
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*/
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package mts
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import (
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"bytes"
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"math/rand"
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"testing"
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"time"
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"bitbucket.org/ausocean/av/container/mts/pes"
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"bitbucket.org/ausocean/av/container/mts/psi"
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"github.com/Comcast/gots/packet"
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)
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// TestGetPTSRange checks that GetPTSRange can correctly get the first and last
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// PTS in an MPEGTS clip.
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func TestGetPTSRange(t *testing.T) {
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const (
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numOfFrames = 20
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maxFrameSize = 1000
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minFrameSize = 100
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rate = 25 // fps
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interval = float64(1) / rate // s
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ptsFreq = 90000 // Hz
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)
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// Generate randomly sized data for each frame.
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rand.Seed(time.Now().UnixNano())
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frames := make([][]byte, numOfFrames)
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for i := range frames {
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size := rand.Intn(maxFrameSize-minFrameSize) + minFrameSize
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frames[i] = make([]byte, size)
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}
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var clip bytes.Buffer
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// Write the PSI first.
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err := writePSI(&clip)
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if err != nil {
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t.Fatalf("did not expect error writing psi: %v", err)
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}
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// Now write frames.
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var curTime float64
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for _, frame := range frames {
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nextPTS := curTime * ptsFreq
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err = writeFrame(&clip, frame, uint64(nextPTS))
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if err != nil {
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t.Fatalf("did not expect error writing frame: %v", err)
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}
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curTime += interval
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}
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got, err := GetPTSRange(clip.Bytes(), videoPid)
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if err != nil {
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t.Fatalf("did not expect error getting PTS range: %v", err)
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}
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want := [2]uint64{0, uint64((numOfFrames - 1) * interval * ptsFreq)}
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if got != want {
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t.Errorf("did not get expected result.\n Got: %v\n Want: %v\n", got, want)
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}
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}
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// writePSI is a helper function write the PSI found at the start of a clip.
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func writePSI(b *bytes.Buffer) error {
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// Write PAT.
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pat := Packet{
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PUSI: true,
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PID: PatPid,
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CC: 0,
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AFC: HasPayload,
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Payload: psi.AddPadding(patTable),
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}
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_, err := b.Write(pat.Bytes(nil))
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if err != nil {
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return err
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}
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// Write PMT.
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pmt := Packet{
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PUSI: true,
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PID: PmtPid,
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CC: 0,
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AFC: HasPayload,
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Payload: psi.AddPadding(pmtTable),
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}
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_, err = b.Write(pmt.Bytes(nil))
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if err != nil {
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return err
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}
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return nil
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}
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// writeFrame is a helper function used to form a PES packet from a frame, and
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// then fragment this across MPEGTS packets where they are then written to the
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// given buffer.
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func writeFrame(b *bytes.Buffer, frame []byte, pts uint64) error {
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// Prepare PES data.
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pesPkt := pes.Packet{
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StreamID: H264ID,
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PDI: hasPTS,
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PTS: pts,
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Data: frame,
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HeaderLength: 5,
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}
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buf := pesPkt.Bytes(nil)
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// Write PES data acroos MPEGTS packets.
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pusi := true
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for len(buf) != 0 {
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pkt := Packet{
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PUSI: pusi,
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PID: videoPid,
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RAI: pusi,
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CC: 0,
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AFC: hasAdaptationField | hasPayload,
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PCRF: pusi,
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}
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n := pkt.FillPayload(buf)
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buf = buf[n:]
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pusi = false
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_, err := b.Write(pkt.Bytes(nil))
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if err != nil {
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return err
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}
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}
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return nil
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}
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// TestBytes checks that Packet.Bytes() correctly produces a []byte
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// representation of a Packet.
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func TestBytes(t *testing.T) {
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const payloadLen, payloadChar, stuffingChar = 120, 0x11, 0xff
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const stuffingLen = PacketSize - payloadLen - 12
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tests := []struct {
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packet Packet
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expectedHeader []byte
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}{
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{
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packet: Packet{
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PUSI: true,
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PID: 1,
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RAI: true,
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CC: 4,
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AFC: HasPayload | HasAdaptationField,
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PCRF: true,
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PCR: 1,
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},
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expectedHeader: []byte{
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0x47, // Sync byte.
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0x40, // TEI=0, PUSI=1, TP=0, PID=00000.
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0x01, // PID(Cont)=00000001.
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0x34, // TSC=00, AFC=11(adaptation followed by payload), CC=0100(4).
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byte(7 + stuffingLen), // AFL=.
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0x50, // DI=0,RAI=1,ESPI=0,PCRF=1,OPCRF=0,SPF=0,TPDF=0, AFEF=0.
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0x00, 0x00, 0x00, 0x00, 0x80, 0x00, // PCR.
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},
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},
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}
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for testNum, test := range tests {
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// Construct payload.
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payload := make([]byte, 0, payloadLen)
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for i := 0; i < payloadLen; i++ {
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payload = append(payload, payloadChar)
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}
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// Fill the packet payload.
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test.packet.FillPayload(payload)
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// Create expected packet data and copy in expected header.
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expected := make([]byte, len(test.expectedHeader), PacketSize)
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copy(expected, test.expectedHeader)
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// Append stuffing.
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for i := 0; i < stuffingLen; i++ {
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expected = append(expected, stuffingChar)
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}
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// Append payload to expected bytes.
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expected = append(expected, payload...)
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// Compare got with expected.
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got := test.packet.Bytes(nil)
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if !bytes.Equal(got, expected) {
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t.Errorf("did not get expected result for test: %v.\n Got: %v\n Want: %v\n", testNum, got, expected)
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}
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}
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}
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// TestFindPid checks that FindPid can correctly extract the first instance
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// of a PID from an MPEG-TS stream.
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func TestFindPid(t *testing.T) {
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const targetPacketNum, numOfPackets, targetPid, stdPid = 6, 15, 1, 0
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// Prepare the stream of packets.
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var stream []byte
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for i := 0; i < numOfPackets; i++ {
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pid := uint16(stdPid)
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if i == targetPacketNum {
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pid = targetPid
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}
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p := Packet{
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PID: pid,
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AFC: hasPayload | hasAdaptationField,
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}
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p.FillPayload([]byte{byte(i)})
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stream = append(stream, p.Bytes(nil)...)
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}
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// Try to find the targetPid in the stream.
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p, i, err := FindPid(stream, targetPid)
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if err != nil {
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t.Fatalf("unexpected error finding PID: %v\n", err)
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}
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// Check the payload.
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var _p packet.Packet
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copy(_p[:], p)
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payload, err := packet.Payload(&_p)
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if err != nil {
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t.Fatalf("unexpected error getting packet payload: %v\n", err)
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}
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got := payload[0]
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if got != targetPacketNum {
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t.Errorf("payload of found packet is not correct.\nGot: %v, Want: %v\n", got, targetPacketNum)
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}
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// Check the index.
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_got := i / PacketSize
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if _got != targetPacketNum {
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t.Errorf("index of found packet is not correct.\nGot: %v, want: %v\n", _got, targetPacketNum)
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}
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}
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