mirror of https://bitbucket.org/ausocean/av.git
352 lines
10 KiB
Go
352 lines
10 KiB
Go
/*
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NAME
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mtsSender_test.go
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DESCRIPTION
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mtsSender_test.go contains tests that validate the functionalilty of the
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mtsSender under senders.go. Tests include checks that the mtsSender is
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segmenting sends correctly, and also that it can correct discontinuities.
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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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mtsSender_test.go is Copyright (C) 2017-2019 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 revid
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import (
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"errors"
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"testing"
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"time"
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"github.com/Comcast/gots/packet"
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"github.com/Comcast/gots/pes"
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"bitbucket.org/ausocean/av/container/mts"
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"bitbucket.org/ausocean/av/container/mts/meta"
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"bitbucket.org/ausocean/utils/logger"
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)
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var (
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errSendFailed = errors.New("send failed")
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)
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// destination simulates a destination for the mtsSender. It allows for the
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// emulation of failed and delayed sends.
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type destination struct {
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// Holds the clips written to this destination using Write.
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buf [][]byte
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// testFails is set to true if we would like a write to fail at a particular
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// clip as determined by failAt.
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testFails bool
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failAt int
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// Holds the current clip number.
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currentClip int
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// Pointer to the testing.T of a test where this struct is being used. This
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// is used so that logging can be done through the testing log utilities.
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t *testing.T
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// sendDelay is the amount of time we would like a Write to be delayed when
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// we hit the clip number indicated by delayAt.
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sendDelay time.Duration
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delayAt int
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// done will be used to send a signal to the main routine to indicate that
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// the destination has received all clips. doneAt indicates the final clip
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// number.
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done chan struct{}
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doneAt int
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}
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func (ts *destination) Write(d []byte) (int, error) {
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ts.t.Log("writing clip to destination")
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if ts.delayAt != 0 && ts.currentClip == ts.delayAt {
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time.Sleep(ts.sendDelay)
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}
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if ts.testFails && ts.currentClip == ts.failAt {
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ts.t.Log("failed send")
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ts.currentClip++
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return 0, errSendFailed
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}
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cpy := make([]byte, len(d))
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copy(cpy, d)
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ts.buf = append(ts.buf, cpy)
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if ts.currentClip == ts.doneAt {
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close(ts.done)
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}
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ts.currentClip++
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return len(d), nil
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}
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func (ts *destination) Close() error { return nil }
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// dummyLogger will allow logging to be done by the testing pkg.
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type dummyLogger testing.T
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func (dl *dummyLogger) log(lvl int8, msg string, args ...interface{}) {
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var l string
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switch lvl {
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case logger.Warning:
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l = "warning"
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case logger.Debug:
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l = "debug"
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case logger.Info:
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l = "info"
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case logger.Error:
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l = "error"
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case logger.Fatal:
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l = "fatal"
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}
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msg = l + ": " + msg
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for i := 0; i < len(args); i++ {
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msg += " %v"
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}
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if len(args) == 0 {
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dl.Log(msg + "\n")
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return
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}
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dl.Logf(msg+"\n", args)
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}
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// TestSegment ensures that the mtsSender correctly segments data into clips
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// based on positioning of PSI in the mtsEncoder's output stream.
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func TestMtsSenderSegment(t *testing.T) {
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mts.Meta = meta.New()
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// Create ringBuffer, sender, sender and the MPEGTS encoder.
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const numberOfClips = 11
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dst := &destination{t: t, done: make(chan struct{}), doneAt: numberOfClips}
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sender := newMtsSender(dst, (*dummyLogger)(t).log, rbSize, rbElementSize, wTimeout)
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encoder := mts.NewEncoder(sender, 25, mts.Video)
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// Turn time based PSI writing off for encoder.
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const psiSendCount = 10
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encoder.TimeBasedPsi(false, psiSendCount)
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// Write the packets to the encoder, which will in turn write to the mtsSender.
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// Payload will just be packet number.
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t.Log("writing packets")
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const noOfPacketsToWrite = 100
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for i := 0; i < noOfPacketsToWrite; i++ {
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encoder.Write([]byte{byte(i)})
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}
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// Wait until the destination has all the data, then close the sender.
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<-dst.done
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sender.Close()
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// Check the data.
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result := dst.buf
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expectData := 0
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for clipNo, clip := range result {
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t.Logf("Checking clip: %v\n", clipNo)
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// Check that the clip is of expected length.
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clipLen := len(clip)
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if clipLen != psiSendCount*mts.PacketSize {
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t.Fatalf("Clip %v is not correct length. Got: %v Want: %v\n Clip: %v\n", clipNo, clipLen, psiSendCount*mts.PacketSize, clip)
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}
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// Also check that the first packet is a PAT.
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firstPkt := clip[:mts.PacketSize]
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var pkt packet.Packet
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copy(pkt[:], firstPkt)
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pid := pkt.PID()
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if pid != mts.PatPid {
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t.Fatalf("First packet of clip %v is not pat, but rather: %v\n", clipNo, pid)
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}
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// Check that the clip data is okay.
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t.Log("checking clip data")
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for i := 0; i < len(clip); i += mts.PacketSize {
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copy(pkt[:], clip[i:i+mts.PacketSize])
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if pkt.PID() == mts.VideoPid {
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t.Log("got video PID")
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payload, err := pkt.Payload()
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if err != nil {
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t.Fatalf("Unexpected err: %v\n", err)
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}
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// Parse PES from the MTS payload.
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pes, err := pes.NewPESHeader(payload)
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if err != nil {
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t.Fatalf("Unexpected err: %v\n", err)
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}
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// Get the data from the PES packet and convert to an int.
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data := int8(pes.Data()[0])
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// Calc expected data in the PES and then check.
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if data != int8(expectData) {
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t.Errorf("Did not get expected pkt data. ClipNo: %v, pktNoInClip: %v, Got: %v, want: %v\n", clipNo, i/mts.PacketSize, data, expectData)
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}
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expectData++
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}
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}
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}
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}
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// TestMtsSenderFailedSend checks that a failed send is correctly handled by
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// the mtsSender. The mtsSender should try to send the same clip again.
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func TestMtsSenderFailedSend(t *testing.T) {
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mts.Meta = meta.New()
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// Create destination, the mtsSender and the mtsEncoder
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const clipToFailAt = 3
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tstDst := &destination{t: t, testFails: true, failAt: clipToFailAt, done: make(chan struct{})}
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sender := newMtsSender(tstDst, (*dummyLogger)(t).log, rbSize, rbElementSize, wTimeout)
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encoder := mts.NewEncoder(sender, 25, mts.Video)
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// Turn time based PSI writing off for encoder and send PSI every 10 packets.
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const psiSendCount = 10
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encoder.TimeBasedPsi(false, psiSendCount)
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// Write the packets to the encoder, which will in turn write to the mtsSender.
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// Payload will just be packet number.
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t.Log("writing packets")
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const noOfPacketsToWrite = 100
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for i := 0; i < noOfPacketsToWrite; i++ {
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encoder.Write([]byte{byte(i)})
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}
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// Wait until the destination has all the data, then close the sender.
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<-tstDst.done
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sender.Close()
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// Check that we have data as expected.
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result := tstDst.buf
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expectData := 0
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for clipNo, clip := range result {
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t.Logf("Checking clip: %v\n", clipNo)
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// Check that the clip is of expected length.
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clipLen := len(clip)
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if clipLen != psiSendCount*mts.PacketSize {
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t.Fatalf("Clip %v is not correct length. Got: %v Want: %v\n Clip: %v\n", clipNo, clipLen, psiSendCount*mts.PacketSize, clip)
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}
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// Also check that the first packet is a PAT.
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firstPkt := clip[:mts.PacketSize]
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var pkt packet.Packet
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copy(pkt[:], firstPkt)
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pid := pkt.PID()
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if pid != mts.PatPid {
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t.Fatalf("First packet of clip %v is not pat, but rather: %v\n", clipNo, pid)
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}
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// Check that the clip data is okay.
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t.Log("checking clip data")
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for i := 0; i < len(clip); i += mts.PacketSize {
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copy(pkt[:], clip[i:i+mts.PacketSize])
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if pkt.PID() == mts.VideoPid {
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t.Log("got video PID")
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payload, err := pkt.Payload()
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if err != nil {
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t.Fatalf("Unexpected err: %v\n", err)
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}
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// Parse PES from the MTS payload.
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pes, err := pes.NewPESHeader(payload)
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if err != nil {
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t.Fatalf("Unexpected err: %v\n", err)
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}
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// Get the data from the PES packet and convert to an int.
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data := int8(pes.Data()[0])
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// Calc expected data in the PES and then check.
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if data != int8(expectData) {
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t.Errorf("Did not get expected pkt data. ClipNo: %v, pktNoInClip: %v, Got: %v, want: %v\n", clipNo, i/mts.PacketSize, data, expectData)
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}
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expectData++
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}
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}
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}
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}
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// TestMtsSenderDiscontinuity checks that a discontinuity in a stream is
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// correctly handled by the mtsSender. A discontinuity is caused by overflowing
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// the mtsSender's ringBuffer. It is expected that the next clip seen has the
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// disconinuity indicator applied.
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func TestMtsSenderDiscontinuity(t *testing.T) {
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mts.Meta = meta.New()
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// Create destination, the mtsSender and the mtsEncoder.
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const clipToDelay = 3
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tstDst := &destination{t: t, sendDelay: 10 * time.Millisecond, delayAt: clipToDelay, done: make(chan struct{})}
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sender := newMtsSender(tstDst, (*dummyLogger)(t).log, 1, rbElementSize, wTimeout)
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encoder := mts.NewEncoder(sender, 25, mts.Video)
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// Turn time based PSI writing off for encoder.
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const psiSendCount = 10
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encoder.TimeBasedPsi(false, psiSendCount)
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// Write the packets to the encoder, which will in turn write to the mtsSender.
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// Payload will just be packet number.
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const noOfPacketsToWrite = 100
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for i := 0; i < noOfPacketsToWrite; i++ {
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encoder.Write([]byte{byte(i)})
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}
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// Wait until the destination has all the data, then close the sender.
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<-tstDst.done
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sender.Close()
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// Check the data.
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result := tstDst.buf
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expectedCC := 0
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for clipNo, clip := range result {
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t.Logf("Checking clip: %v\n", clipNo)
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// Check that the clip is of expected length.
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clipLen := len(clip)
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if clipLen != psiSendCount*mts.PacketSize {
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t.Fatalf("Clip %v is not correct length. Got: %v Want: %v\n Clip: %v\n", clipNo, clipLen, psiSendCount*mts.PacketSize, clip)
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}
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// Also check that the first packet is a PAT.
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firstPkt := clip[:mts.PacketSize]
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var pkt packet.Packet
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copy(pkt[:], firstPkt)
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pid := pkt.PID()
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if pid != mts.PatPid {
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t.Fatalf("First packet of clip %v is not pat, but rather: %v\n", clipNo, pid)
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}
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// Get the discontinuity indicator
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discon, _ := (*packet.AdaptationField)(&pkt).Discontinuity()
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// Check the continuity counter.
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cc := pkt.ContinuityCounter()
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if cc != expectedCC {
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t.Log("discontinuity found")
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expectedCC = cc
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if !discon {
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t.Errorf("discontinuity indicator not set where expected for clip: %v", clipNo)
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}
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} else {
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if discon && clipNo != 0 {
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t.Errorf("did not expect discontinuity indicator to be set for clip: %v", clipNo)
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}
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}
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expectedCC = (expectedCC + 1) & 0xf
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}
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}
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