mirror of https://bitbucket.org/ausocean/av.git
756 lines
18 KiB
Go
756 lines
18 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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"reflect"
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"strconv"
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"testing"
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"time"
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"github.com/Comcast/gots/packet"
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gotspsi "github.com/Comcast/gots/psi"
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"github.com/pkg/errors"
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"bitbucket.org/ausocean/av/container/mts/meta"
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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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)
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// TestGetPTSRange checks that GetPTSRange can correctly get the first and last
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// PTS in an MPEGTS clip for a general case.
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func TestGetPTSRange1(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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// TestGetPTSRange2 checks that GetPTSRange behaves correctly with cases where
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// the first instance of a PID is not a payload start, and also where there
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// are no payload starts.
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func TestGetPTSRange2(t *testing.T) {
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const (
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nPackets = 8 // The number of MTS packets we will generate.
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wantPID = 1 // The PID we want.
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)
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tests := []struct {
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pusi []bool // The value of PUSI for each packet.
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pid []uint16 // The PIDs for each packet.
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pts []uint64 // The PTS for each packet.
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want [2]uint64 // The wanted PTS from GetPTSRange.
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err error // The error we expect from GetPTSRange.
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}{
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{
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[]bool{false, false, false, true, false, false, true, false},
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[]uint16{0, 0, 1, 1, 1, 1, 1, 1},
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[]uint64{0, 0, 0, 1, 0, 0, 2, 0},
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[2]uint64{1, 2},
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nil,
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},
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{
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[]bool{false, false, false, true, false, false, false, false},
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[]uint16{0, 0, 1, 1, 1, 1, 1, 1},
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[]uint64{0, 0, 0, 1, 0, 0, 0, 0},
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[2]uint64{1, 1},
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nil,
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},
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{
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[]bool{false, false, false, false, false, false, false, false},
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[]uint16{0, 0, 1, 1, 1, 1, 1, 1},
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[]uint64{0, 0, 0, 0, 0, 0, 0, 0},
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[2]uint64{0, 0},
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errNoPTS,
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},
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}
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var clip bytes.Buffer
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for i, test := range tests {
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// Generate MTS packets for this test.
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clip.Reset()
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for j := 0; j < nPackets; j++ {
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pesPkt := pes.Packet{
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StreamID: H264ID,
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PDI: hasPTS,
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PTS: test.pts[j],
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Data: []byte{},
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HeaderLength: 5,
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}
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buf := pesPkt.Bytes(nil)
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pkt := Packet{
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PUSI: test.pusi[j],
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PID: test.pid[j],
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RAI: true,
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CC: 0,
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AFC: hasAdaptationField | hasPayload,
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PCRF: true,
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}
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pkt.FillPayload(buf)
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_, err := clip.Write(pkt.Bytes(nil))
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if err != nil {
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t.Fatalf("did not expect clip write error: %v", err)
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}
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}
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pts, err := GetPTSRange(clip.Bytes(), wantPID)
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if err != test.err {
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t.Errorf("did not get expected error for test: %v\nGot: %v\nWant: %v\n", i, err, test.err)
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}
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if pts != test.want {
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t.Errorf("did not get expected result for test: %v\nGot: %v\nWant: %v\n", i, pts, test.want)
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}
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}
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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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// TestTrimToMetaRange checks that TrimToMetaRange can correctly return a segment
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// of MPEG-TS corresponding to a meta interval in a slice of MPEG-TS.
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func TestTrimToMetaRange(t *testing.T) {
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Meta = meta.New()
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const (
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nPSI = 10
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key = "n"
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)
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var clip bytes.Buffer
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for i := 0; i < nPSI; i++ {
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Meta.Add(key, strconv.Itoa((i*2)+1))
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err := writePSIWithMeta(&clip)
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if err != nil {
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t.Fatalf("did not expect to get error writing PSI, error: %v", err)
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}
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}
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tests := []struct {
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from string
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to string
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expect []byte
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err error
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}{
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{
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from: "3",
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to: "9",
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expect: clip.Bytes()[3*PacketSize : 10*PacketSize],
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err: nil,
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},
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{
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from: "30",
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to: "8",
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expect: nil,
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err: errMetaLowerBound,
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},
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{
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from: "3",
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to: "30",
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expect: nil,
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err: errMetaUpperBound,
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},
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}
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// Run tests.
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for i, test := range tests {
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got, err := TrimToMetaRange(clip.Bytes(), key, test.from, test.to)
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// First check the error.
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if err != nil && err != test.err {
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t.Errorf("unexpected error: %v for test: %v", err, i)
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continue
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} else if err != test.err {
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t.Errorf("expected to get error: %v for test: %v", test.err, i)
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continue
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}
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// Now check data.
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if test.err == nil && !bytes.Equal(test.expect, got) {
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t.Errorf("did not get expected data for test: %v\n Got: %v\n, Want: %v\n", i, got, test.expect)
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}
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}
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}
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// TestSegmentForMeta checks that SegmentForMeta can correctly segment some MTS
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// data based on a given meta key and value.
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func TestSegmentForMeta(t *testing.T) {
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Meta = meta.New()
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const (
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nPSI = 10 // The number of PSI pairs to write.
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key = "n" // The meta key we will work with.
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val = "*" // This is the meta value we will look for.
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)
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tests := []struct {
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metaVals [nPSI]string // This represents the meta value for meta pairs (PAT and PMT)
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expectIdxs []rng // This gives the expect index ranges for the segments.
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}{
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{
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metaVals: [nPSI]string{"1", "2", val, val, val, "3", val, val, "4", "4"},
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expectIdxs: []rng{
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scale(2, 5),
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scale(6, 8),
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},
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},
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{
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metaVals: [nPSI]string{"1", "2", val, val, val, "", "3", val, val, "4"},
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expectIdxs: []rng{
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scale(2, 5),
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scale(7, 9),
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},
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},
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{
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metaVals: [nPSI]string{"1", "2", val, val, val, "", "3", val, val, val},
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expectIdxs: []rng{
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scale(2, 5),
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{((7 * 2) + 1) * PacketSize, (nPSI * 2) * PacketSize},
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},
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},
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{
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metaVals: [nPSI]string{"1", "2", "3", "4", "5", "6", "7", "8", "9", "10"},
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expectIdxs: nil,
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},
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}
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var clip bytes.Buffer
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for testn, test := range tests {
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// We want a clean buffer for each new test, so reset.
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clip.Reset()
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// Add meta and write PSI to clip.
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for i := 0; i < nPSI; i++ {
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if test.metaVals[i] != "" {
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Meta.Add(key, test.metaVals[i])
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} else {
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Meta.Delete(key)
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}
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err := writePSIWithMeta(&clip)
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if err != nil {
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t.Fatalf("did not expect to get error writing PSI, error: %v", err)
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}
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}
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// Now we get the expected segments using the index ranges from the test.
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var want [][]byte
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for _, idxs := range test.expectIdxs {
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want = append(want, clip.Bytes()[idxs.start:idxs.end])
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}
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// Now use the function we're testing to get the segments.
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got, err := SegmentForMeta(clip.Bytes(), key, val)
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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// Check that segments are OK.
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if !reflect.DeepEqual(want, got) {
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t.Errorf("did not get expected result for test %v\nGot: %v\nWant: %v\n", testn, got, want)
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}
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// Now test IndexPid.
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i, _, m, err := FindPSI(clip.Bytes())
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if err != nil {
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t.Fatalf("IndexPid failed with error: %v", err)
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}
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if i != 0 {
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t.Fatalf("IndexPid unexpected index; got %d, expected 0", i)
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}
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if m["n"] != "1" {
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t.Fatalf("IndexPid unexpected metadata; got %s, expected 1", m["n"])
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}
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}
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// Finally, test IndexPid error handling.
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for _, d := range [][]byte{[]byte{}, make([]byte, PacketSize/2), make([]byte, PacketSize)} {
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_, _, _, err := FindPSI(d)
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if err == nil {
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t.Fatalf("IndexPid expected error")
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}
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}
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}
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// rng describes an index range and is used by TestSegmentForMeta.
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type rng struct {
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start int
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end int
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}
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// scale takes a PSI index (i.e. first PSI is 0, next is 1) and modifies to be
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// the index of the first byte of the PSI pair (PAT and PMT) in the byte stream.
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// This assumes there are only PSI written consequitively, and is used by
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// TestSegmentForMeta.
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func scale(x, y int) rng {
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return rng{
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((x * 2) + 1) * PacketSize,
|
|
((y * 2) + 1) * PacketSize,
|
|
}
|
|
}
|
|
|
|
func TestFindPSI(t *testing.T) {
|
|
const (
|
|
pat = iota
|
|
pmt
|
|
media
|
|
)
|
|
|
|
const (
|
|
metaKey = "key"
|
|
mediaType = gotspsi.PmtStreamTypeMpeg4Video
|
|
pmtPID = 3
|
|
streamPID = 4
|
|
)
|
|
|
|
type want struct {
|
|
idx int
|
|
streamType uint8
|
|
streamPID uint16
|
|
meta map[string]string
|
|
err error
|
|
}
|
|
|
|
tests := []struct {
|
|
pkts []int
|
|
meta string
|
|
want want
|
|
}{
|
|
{
|
|
pkts: []int{pat, pmt, media, media},
|
|
meta: "1",
|
|
want: want{
|
|
idx: 0,
|
|
streamType: gotspsi.PmtStreamTypeMpeg4Video,
|
|
streamPID: 4,
|
|
meta: map[string]string{
|
|
"key": "1",
|
|
},
|
|
err: nil,
|
|
},
|
|
},
|
|
{
|
|
pkts: []int{media, pat, pmt, media, media},
|
|
meta: "1",
|
|
want: want{
|
|
idx: 188,
|
|
streamType: gotspsi.PmtStreamTypeMpeg4Video,
|
|
streamPID: 4,
|
|
meta: map[string]string{
|
|
"key": "1",
|
|
},
|
|
err: nil,
|
|
},
|
|
},
|
|
{
|
|
pkts: []int{pat, media, pmt, media, media},
|
|
meta: "1",
|
|
want: want{
|
|
idx: 0,
|
|
streamType: gotspsi.PmtStreamTypeMpeg4Video,
|
|
streamPID: 4,
|
|
meta: map[string]string{
|
|
"key": "1",
|
|
},
|
|
err: ErrNotConsecutive,
|
|
},
|
|
},
|
|
}
|
|
|
|
var clip bytes.Buffer
|
|
var err error
|
|
Meta = meta.New()
|
|
|
|
for i, test := range tests {
|
|
// Generate MTS packets for this test.
|
|
clip.Reset()
|
|
|
|
for _, pkt := range test.pkts {
|
|
switch pkt {
|
|
case pat:
|
|
patTable := (&psi.PSI{
|
|
Pf: 0x00,
|
|
Tid: 0x00,
|
|
Ssi: true,
|
|
Pb: false,
|
|
Sl: 0x0d,
|
|
Tss: &psi.TSS{
|
|
Tide: 0x01,
|
|
V: 0,
|
|
Cni: true,
|
|
Sn: 0,
|
|
Lsn: 0,
|
|
Sd: &psi.PAT{
|
|
Pn: 0x01,
|
|
Pmpid: pmtPID,
|
|
},
|
|
},
|
|
}).Bytes()
|
|
|
|
pat := Packet{
|
|
PUSI: true,
|
|
PID: PatPid,
|
|
CC: 0,
|
|
AFC: HasPayload,
|
|
Payload: psi.AddPadding(patTable),
|
|
}
|
|
_, err := clip.Write(pat.Bytes(nil))
|
|
if err != nil {
|
|
t.Fatalf("could not write PAT to clip for test %d", i)
|
|
}
|
|
case pmt:
|
|
pmtTable := (&psi.PSI{
|
|
Pf: 0x00,
|
|
Tid: 0x02,
|
|
Ssi: true,
|
|
Sl: 0x12,
|
|
Tss: &psi.TSS{
|
|
Tide: 0x01,
|
|
V: 0,
|
|
Cni: true,
|
|
Sn: 0,
|
|
Lsn: 0,
|
|
Sd: &psi.PMT{
|
|
Pcrpid: 0x0100,
|
|
Pil: 0,
|
|
Essd: &psi.ESSD{
|
|
St: mediaType,
|
|
Epid: streamPID,
|
|
Esil: 0x00,
|
|
},
|
|
},
|
|
},
|
|
}).Bytes()
|
|
|
|
Meta.Add(metaKey, test.meta)
|
|
pmtTable, err = updateMeta(pmtTable)
|
|
if err != nil {
|
|
t.Fatalf("could not update meta for test %d", i)
|
|
}
|
|
|
|
pmt := Packet{
|
|
PUSI: true,
|
|
PID: pmtPID,
|
|
CC: 0,
|
|
AFC: HasPayload,
|
|
Payload: psi.AddPadding(pmtTable),
|
|
}
|
|
_, err = clip.Write(pmt.Bytes(nil))
|
|
if err != nil {
|
|
t.Fatalf("could not write PMT to clip for test %d", i)
|
|
}
|
|
case media:
|
|
pesPkt := pes.Packet{
|
|
StreamID: mediaType,
|
|
PDI: hasPTS,
|
|
Data: []byte{},
|
|
HeaderLength: 5,
|
|
}
|
|
buf := pesPkt.Bytes(nil)
|
|
|
|
pkt := Packet{
|
|
PUSI: true,
|
|
PID: uint16(streamPID),
|
|
RAI: true,
|
|
CC: 0,
|
|
AFC: hasAdaptationField | hasPayload,
|
|
PCRF: true,
|
|
}
|
|
pkt.FillPayload(buf)
|
|
|
|
_, err := clip.Write(pkt.Bytes(nil))
|
|
if err != nil {
|
|
t.Fatalf("did not expect clip write error: %v", err)
|
|
}
|
|
default:
|
|
t.Fatalf("undefined pkt type %d in test %d", pkt, i)
|
|
}
|
|
}
|
|
|
|
gotIdx, gotStreams, gotMeta, gotErr := FindPSI(clip.Bytes())
|
|
|
|
// Check error
|
|
if errors.Cause(gotErr) != test.want.err {
|
|
t.Errorf("did not get expected error for test %d\nGot: %v\nWant: %v\n", i, gotErr, test.want.err)
|
|
}
|
|
|
|
if gotErr == nil {
|
|
// Check idx
|
|
if gotIdx != test.want.idx {
|
|
t.Errorf("did not get expected idx for test %d\nGot: %v\nWant: %v\n", i, gotIdx, test.want.idx)
|
|
}
|
|
|
|
// Check stream type and PID
|
|
if gotStreams == nil {
|
|
t.Fatalf("gotStreams should not be nil")
|
|
}
|
|
|
|
if len(gotStreams) == 0 {
|
|
t.Fatalf("gotStreams should not be 0 length")
|
|
}
|
|
|
|
s := gotStreams[0]
|
|
gotStreamType := s.StreamType()
|
|
gotStreamPID := s.ElementaryPid()
|
|
|
|
if gotStreamType != test.want.streamType {
|
|
t.Errorf("did not get expected stream type for test %d\nGot: %v\nWant: %v\n", i, gotStreamType, test.want.streamType)
|
|
}
|
|
|
|
if gotStreamPID != test.want.streamPID {
|
|
t.Errorf("did not get expected stream PID for test %d\nGot: %v\nWant: %v\n", i, gotStreamPID, test.want.streamPID)
|
|
}
|
|
|
|
// Check meta
|
|
if !reflect.DeepEqual(gotMeta, test.want.meta) {
|
|
t.Errorf("did not get expected meta for test %d\nGot: %v\nWant: %v\n", i, gotMeta, test.want.meta)
|
|
}
|
|
}
|
|
}
|
|
}
|