Working on cleaning up code and comments

bitrate/BitrateCalculator.go

@@ -1,72 +0,0 @@
-/*
-NAME
-  BitrateCalculator.go - is a simple struct with methods to allow for easy
-	calculation of bitrate.
-
-DESCRIPTION
-  See Readme.md
-
-AUTHOR
-  Saxon Nelson-Milton <saxon.milton@gmail.com>
-
-LICENSE
-  BitrateCalculator.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
-
-  It is free software: you can redistribute it and/or modify them
-  under the terms of the GNU General Public License as published by the
-  Free Software Foundation, either version 3 of the License, or (at your
-  option) any later version.
-
-  It is distributed in the hope that it will be useful, but WITHOUT
-  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with revid in gpl.txt.  If not, see [GNU licenses](http://www.gnu.org/licenses).
-*/
-
-package bitrate
-
-import (
-	"fmt"
-	"time"
-)
-
-// BitrateCalculator provides fields and methods to allow calculation of bitrate
-type BitrateCalculator struct {
-	outputDelay     int // sec
-	now             time.Time
-	prev            time.Time
-	startedBefore   bool
-	elapsedTime     time.Duration
-	lastDisplayTime time.Time
-}
-
-// Place this at the start of the code segment that you would like to time
-func (bc *BitrateCalculator) Start(outputDelay int) {
-	if outputDelay >= 0 {
-		bc.outputDelay = outputDelay
-	} else {
-		bc.outputDelay = 0
-	}
-	bc.prev = time.Now()
-	if !bc.startedBefore {
-		bc.startedBefore = true
-		bc.elapsedTime = time.Duration(0)
-		bc.lastDisplayTime = time.Now()
-	}
-}
-
-// Place this at the end of the code segment that you would like to time
-func (bc *BitrateCalculator) Stop(noOfKB float64) (bitrate int64) {
-	bc.now = time.Now()
-	deltaTime := bc.now.Sub(bc.prev)
-	if bc.now.Sub(bc.lastDisplayTime) > time.Duration(bc.outputDelay)*time.Second {
-		bitrate = int64(noOfKB / float64(deltaTime/1e9))
-		fmt.Printf("Bitrate: %d kbps\n", bitrate)
-		bc.elapsedTime = time.Duration(0)
-		bc.lastDisplayTime = bc.now
-	}
-	return
-}

bitrate/BitrateCalculator_test.go

@@ -1,77 +0,0 @@
-/*
-NAME
-  BitrateCalculator_test.go - is a file that may be used to test the
-	BitrateCalculator.go file using the golang testing utilities
-
-DESCRIPTION
-  See Readme.md
-
-AUTHOR
-  Saxon Nelson-Milton <saxon.milton@gmail.com>
-
-LICENSE
-  BitrateCalculator_test.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
-
-  It is free software: you can redistribute it and/or modify them
-  under the terms of the GNU General Public License as published by the
-  Free Software Foundation, either version 3 of the License, or (at your
-  option) any later version.
-
-  It is distributed in the hope that it will be useful, but WITHOUT
-  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with revid in gpl.txt.  If not, see [GNU licenses](http://www.gnu.org/licenses).
-*/
-
-package bitrate
-
-import (
-	"testing"
-	"time"
-)
-
-// Some consts used over duration of testing
-const (
-	bitrateDelay1 = 0 // s
-	bitrateDelay2 = 5 // s
-	amountOfData  = 100000.0
-	testTime      = 2500.0 // ms
-)
-
-// This will be the BitrateCalculator object we use over testing
-var bitrateCalc BitrateCalculator
-
-// Simple test to check that the calculator can calc bitrate over a given
-// duration of time
-func Test1(t *testing.T) {
-	bitrateCalc = BitrateCalculator{}
-	bitrateCalc.Start(bitrateDelay1)
-	time.Sleep(testTime * time.Millisecond)
-	currentBitrate := int64(bitrateCalc.Stop(amountOfData))
-	actualBitrate := int64(amountOfData / ((testTime * time.Millisecond) / 1e9))
-	if currentBitrate != actualBitrate {
-		t.Errorf("Bitrate is wrong! Calculated: %v Actual %v", currentBitrate, actualBitrate)
-	}
-}
-
-// Now let's check that the output delay feature works
-func Test2(t *testing.T) {
-	bitrateCalc = BitrateCalculator{}
-	var currentBitrate int64
-	for i := 0; i < 2; i++ {
-		bitrateCalc.Start(bitrateDelay2)
-		time.Sleep(testTime * time.Millisecond)
-		currentBitrate = int64(bitrateCalc.Stop(amountOfData))
-		if i == 0 && currentBitrate != 0 {
-			t.Errorf("The bitrate calc did not delay outputting!")
-		}
-		time.Sleep(6000 * time.Millisecond)
-	}
-	actualBitrate := int64(amountOfData / ((testTime * time.Millisecond) / 1e9))
-	if currentBitrate != actualBitrate {
-		t.Errorf("Bitrate is wrong! Calculated: %v Actual %v", currentBitrate, actualBitrate)
-	}
-}

effslice/EffSlice.go

@@ -1,28 +0,0 @@
-package efficientbuffer
-
-type dataBlock struct {
-  address     []byte  // Address of the data block (slice)
-  lowerBound  int     // Lower bound of the data we're interested in
-  upperBound  int     // Upper bound of the data we're interested in
-  startIndex  int     // Index in our EffSlice
-}
-
-type EffSlice struct {
-  data map[int](*dataChunk)
-}
-
-func (s *EffSlice)GetElement(index int) byte {
-}
-
-func (s *EffSlice)AsByteSlice() []byte {
-
-}
-
-func (s *EffSlice)Append(data *EffSlice){
-}
-
-func (s *EffSlice)Append(data []byte){
-}
-
-func (s *EffSlice)Len(){
-}

flv/FLV.go

@@ -1,3 +1,30 @@
+/*
+NAME
+  FLV.go
+
+DESCRIPTION
+  See Readme.md
+
+AUTHORS
+	Saxon A. Nelson-Milton <saxon@ausocean.org>
+
+LICENSE
+  FLV.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
+
+  It is free software: you can redistribute it and/or modify them
+  under the terms of the GNU General Public License as published by the
+  Free Software Foundation, either version 3 of the License, or (at your
+  option) any later version.
+
+  It is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with revid in gpl.txt.  If not, see [GNU licenses](http://www.gnu.org/licenses).
+*/
+
 package flv
 
 import (
@@ -26,16 +53,23 @@ const (
 	PCMAudioFormat       = 0
 )
 
+var flvHeaderCode = []byte{0x46, 0x4C, 0x56}
+
 type Header struct {
 	AudioFlag bool
 	VideoFlag bool
 }
 
+func btb(b bool) byte {
+	return tools.BoolToByte(b)
+}
+
 func (h *Header) ToByteSlice() (output []byte) {
 	output = make([]byte, 0, headerLength)
-	output = append(output, []byte{0x46, 0x4C, 0x56,
+	output = append(output, flvheaderCode...)
+	output = append(output, []byte {
 		version,
-		0x00 | tools.BoolToByte(h.AudioFlag)<<2 | tools.BoolToByte(h.VideoFlag),
+		0x00 | btb(h.AudioFlag)<<2 | btb(h.VideoFlag),
 		0x00, 0x00, 0x00, byte(9),
 	}...)
 	fmt.Println(output)
@@ -66,10 +100,14 @@ func (t *VideoTag) ToByteSlice() (output []byte) {
 		byte(t.Timestamp >> 8),
 		byte(t.Timestamp),
 		byte(t.TimestampExtended),
-		0x00, 0x00, 0x00,
+		0x00,
-		0x00 | byte(t.FrameType << 4) | byte(t.Codec),
+		0x00,
+		0x00,
+		0x00 | byte(t.FrameType<<4) | byte(t.Codec),
 		t.PacketType,
-		byte(t.CompositionTime >> 16),byte(t.CompositionTime >> 8),byte(t.CompositionTime),
+		byte(t.CompositionTime >> 16),
+		byte(t.CompositionTime >> 8),
+		byte(t.CompositionTime),
 	}...)
 	output = append(output, t.Data...)
 	output = append(output, []byte{
@@ -105,8 +143,10 @@ func (t *AudioTag) ToByteSlice() (output []byte) {
 		byte(t.Timestamp >> 8),
 		byte(t.Timestamp),
 		byte(t.TimestampExtended),
-		0x00, 0x00, 0x00,
+		0x00,
-		byte(t.SoundFormat << 4) | byte(t.SoundRate<<2) | byte(tools.BoolToByte(t.SoundSize)<<1) | byte(tools.BoolToByte(t.SoundType)),
+		0x00,
+		0x00,
+		byte(t.SoundFormat<<4) | byte(t.SoundRate<<2) | btb(t.SoundSize)<<1 | btb(t.SoundType),
 	}...)
 	output = append(output, t.Data...)
 	output = append(output, []byte{

revid/Config.go

@@ -1,3 +1,30 @@
+/*
+NAME
+  Config.go
+
+DESCRIPTION
+  See Readme.md
+
+AUTHORS
+	Saxon A. Nelson-Milton <saxon@ausocean.org>
+
+LICENSE
+  Config.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
+
+  It is free software: you can redistribute it and/or modify them
+  under the terms of the GNU General Public License as published by the
+  Free Software Foundation, either version 3 of the License, or (at your
+  option) any later version.
+
+  It is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with revid in gpl.txt.  If not, see [GNU licenses](http://www.gnu.org/licenses).
+*/
+
 package revid
 
 import (
@@ -19,9 +46,10 @@ type Config struct {
 	InputCodec         uint8
 	Output             uint8
 	RtmpEncodingMethod uint8
+	RtmpMethod 					uint8
+	Packetization      uint8
 	FramesPerClip      int
 	RtmpUrl            string
-	RtmpMethod uint8
 	Bitrate            string
 	OutputFileName     string
 	InputFileName      string
@@ -31,7 +59,6 @@ type Config struct {
 	HttpAddress        string
 	Quantization       string
 	Timeout            string
-	Packetization      uint8
 	IntraRefreshPeriod string
 	Logger             smartLogger.LogInstance
 }

revid/RevidInstance.go

@@ -1,16 +1,16 @@
 /*
 NAME
-  revid - a testbed for re-muxing and re-directing video streams as MPEG-TS over various protocols.
+  RevidInstance.go
 
 DESCRIPTION
   See Readme.md
 
 AUTHORS
-  Alan Noble <anoble@gmail.com>
+	Saxon A. Nelson-Milton <saxon@ausocean.org>
-	Saxon A. Nelson-Milton <saxon.milton@gmail.com>
+	Alan Noble <alan@ausocean.org>
 
 LICENSE
-  revid is Copyright (C) 2017 Alan Noble.
+  revid is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
 
   It is free software: you can redistribute it and/or modify them
   under the terms of the GNU General Public License as published by the
@@ -68,6 +68,7 @@ const (
 	mjpegParserInChanLen  = 100000
 	ffmpegPath            = "/home/saxon/bin/ffmpeg"
 	rtmpConnectionTimout 	= 10
+	outputChanSize 				= 10000
 )
 
 // Log Types
@@ -123,7 +124,7 @@ func NewRevidInstance(config Config) (r *revidInst, err error) {
 	if err != nil {
 		return nil, err
 	}
-	r.outputChan = make(chan []byte, 10000)
+	r.outputChan = make(chan []byte, outputchanSize)
 	r.parser.Start()
 	go r.packClips()
 	r.Log(Info, "New revid instance created! config is:")
@@ -145,6 +146,7 @@ func (r *revidInst) ChangeState(config Config) error {
 		return errors.New("Config struct is bad!: " + err.Error())
 	}
 	r.config = config
+
 	switch r.config.Output {
 	case File:
 		r.sendClip = r.sendClipToFile
@@ -161,6 +163,7 @@ func (r *revidInst) ChangeState(config Config) error {
 	case Http:
 		r.sendClip = r.sendClipToHTTP
 	}
+
 	switch r.config.Input {
 	case Raspivid:
 		r.setupInput = r.setupInputForRaspivid
@@ -176,11 +179,13 @@ func (r *revidInst) ChangeState(config Config) error {
 		r.Log(Info, "Using MJPEG parser!")
 		r.parser = parser.NewMJPEGParser(mjpegParserInChanLen)
 	}
-	if r.config.Packetization == None {
+
+	switch r.config.Packetization {
+	case None:
+		// no packetisation - Revid output chan grabs raw data straight from parser
 		r.parser.SetOutputChan(r.outputChan)
 		r.getFrame = r.getFrameNoPacketization
-	} else {
+		goto noPacketizationSetup
-		switch r.config.Packetization {
 	case Mpegts:
 		r.Log(Info, "Using MPEGTS packetisation!")
 		frameRateAsInt, _ := strconv.Atoi(r.config.FrameRate)
@@ -190,10 +195,13 @@ func (r *revidInst) ChangeState(config Config) error {
 		frameRateAsInt, _ := strconv.Atoi(r.config.FrameRate)
 		r.generator = generator.NewFlvGenerator(true, true, uint(frameRateAsInt))
 	}
+	// We have packetization of some sort, so we want to send data to Generator
+	// to perform packetization
 	r.getFrame = r.getFramePacketization
 	r.parser.SetOutputChan(r.generator.GetInputChan())
 	r.generator.Start()
-	}
+	noPacketizationSetup:
+
 	return nil
 }
 
@@ -214,7 +222,7 @@ func (r *revidInst) IsRunning() bool {
 }
 
 // Start invokes a revidInst to start processing video from a defined input
-// and packetising to a defined output.
+// and packetising (if theres packetization) to a defined output.
 func (r *revidInst) Start() {
 	if r.isRunning {
 		r.Log(Warning, "revidInst.Start() called but revid already running!")
@@ -236,6 +244,7 @@ func (r *revidInst) Stop() {
 	if r.isRunning {
 		r.Log(Info, "Stopping revid!")
 		r.isRunning = false
+		// If a cmd process is running, we kill!
 		if r.cmd != nil {
 			r.cmd.Process.Kill()
 		}
@@ -244,39 +253,32 @@ func (r *revidInst) Stop() {
 	}
 }
 
-// Start invokes a revidInst to start processing video from a defined input
+// getFrameNoPacketization gets a frame directly from the revid output chan
-// and packetising to a defined output.
+// as we don't need to go through the generator with no packetization settings
 func (r *revidInst) getFrameNoPacketization() []byte {
 	return <-r.outputChan
 }
 
-// Start invokes a revidInst to start processing video from a defined input
+// getFramePacketization gets a frame from the generators output chan - the
-// and packetising to a defined output.
+// the generator being an mpegts or flv generator depending on the config
 func (r *revidInst) getFramePacketization() []byte {
 	return <-(r.generator.GetOutputChan())
 }
 
-// Start invokes a revidInst to start processing video from a defined input
+// flushDataPacketization removes data from the revid inst's coutput chan
-// and packetising to a defined output.
+func (r *revidInst) flushData() {
-func (r *revidInst) flushDataNoPacketisation() {
 	for len(r.outputChan) > 0 {
 		<-(r.outputChan)
 	}
 }
 
-// Start invokes a revidInst to start processing video from a defined input
+// packClips takes data segments; whether that be tsPackets or mjpeg frames and
-func (r *revidInst) flushDataMpegtsPacketisation() {
+// packs them into clips consisting of the amount frames specified in the config
-	for len(r.generator.GetOutputChan()) > 0 {
-		<-(r.generator.GetOutputChan())
-	}
-}
-
-// packClips takes data segments; whether that be tsPackets or jpeg frames and
-// packs them into clips 1s long.
 func (r *revidInst) packClips() {
 	clipSize := 0
 	packetCount := 0
 	for {
+		// Get some memory from the ring buffer for out clip
 		if clip, err := r.ringBuffer.Get(); err != nil {
 			r.Log(Error, err.Error())
 			r.Log(Warning, "Clearing output chan!")
@@ -334,7 +336,8 @@ func (r *revidInst) outputClips() {
 					break
 				}
 			}
-
+			// let the ringbuffer know that we're done with the memory we grabbed when
+			// we call ringBuffer.Get()
 			if err := r.ringBuffer.DoneReading(); err != nil {
 				r.Log(Error, err.Error())
 			}
@@ -353,8 +356,7 @@ func (r *revidInst) outputClips() {
 	}
 }
 
-// Start invokes a revidInst to start processing video from a defined input
+// senClipToFile writes the passed clip to a file
-// and packetising to a defined output.
 func (r *revidInst) sendClipToFile(clip []byte) error {
 	_,err := r.outputFile.Write(clip)
 	if err != nil {
@@ -366,9 +368,7 @@ func (r *revidInst) sendClipToFile(clip []byte) error {
 // sendClipToHTTP takes a clip and an output url and posts through http.
 func (r *revidInst) sendClipToHTTP(clip []byte) error {
 	timeout := time.Duration(httpTimeOut * time.Second)
-	client := http.Client{
+	client := http.Client{Timeout: timeout}
-		Timeout: timeout,
-	}
 	url := r.config.HttpAddress+strconv.Itoa(len(clip))
 	r.Log(Debug, fmt.Sprintf("Posting %s (%d bytes)\n", url, len(clip)))
 	resp, err := client.Post(url, "video/mp2t", bytes.NewReader(clip)) // lighter than NewBuffer
@@ -385,23 +385,21 @@ func (r *revidInst) sendClipToHTTP(clip []byte) error {
 	return nil
 }
 
-// Start invokes a revidInst to start processing video from a defined input
+// sendClipToFfmpegRtmp sends the clip over the current rtmp connection using
-// and packetising to a defined output.
+// an ffmpeg process.
-func (r *revidInst) sendClipToFfmpegRtmp(clip []byte) error {
+func (r *revidInst) sendClipToFfmpegRtmp(clip []byte) (err error) {
-	_, err := r.ffmpegStdin.Write(clip)
+	_, err = r.ffmpegStdin.Write(clip)
-	if err != nil {
+	return
-		return err
-	}
-	return nil
 }
 
+// sendClipToLibRtmp send the clip over the current rtmp connection using the
+// c based librtmp library
 func (r *revidInst) sendClipToLibRtmp(clip []byte) (err error) {
 	err = r.rtmpInst.WriteFrame(clip,uint(len(clip)))
 	return
 }
 
-// Start invokes a revidInst to start processing video from a defined input
+// setupOutputForFfmpegRtmp sets up output to rtmp using an ffmpeg process
-// and packetising to a defined output.
 func (r *revidInst) setupOutputForFfmpegRtmp() error {
 	r.ffmpegCmd = exec.Command(ffmpegPath,
 		"-f", "h264",
@@ -434,20 +432,23 @@ func (r *revidInst) setupOutputForFfmpegRtmp() error {
 	return nil
 }
 
+// setupOutputForLibRtmp sets up rtmp output using the wrapper for the c based
+// librtmp library - makes connection and starts comms etc.
 func (r *revidInst) setupOutputForLibRtmp() (err error) {
 	r.rtmpInst = rtmp.NewRTMPSession(r.config.RtmpUrl, rtmpConnectionTimout)
 	err = r.rtmpInst.StartSession()
-	//go r.testRtmp(5000)
+	// go r.testRtmp(5000)
 	return
 }
 
+// setupOutputForFile sets up an output file to output data to
 func (r *revidInst) setupOutputForFile() (err error) {
 	r.outputFile, err = os.Create(r.config.OutputFileName)
 	return
 }
 
-// Start invokes a revidInst to start processing video from a defined input
+// setupInputForRaspivid sets up things for input from raspivid i.e. starts
-// and packetising to a defined output.
+// a raspivid process and pipes it's data output.
 func (r *revidInst) setupInputForRaspivid() error {
 	r.Log(Info, "Starting raspivid!")
 	switch r.config.InputCodec {
@@ -485,7 +486,7 @@ func (r *revidInst) setupInputForRaspivid() error {
 	return nil
 }
 
-// Start invokes a revidInst to start processing video from a defined input
+// setupInputForFile sets things up for getting input from a file
 func (r *revidInst) setupInputForFile() error {
 	fps,_ := strconv.Atoi(r.config.FrameRate)
 	r.parser.SetDelay( uint( float64(1000) / float64(fps) ) )
@@ -493,6 +494,9 @@ func (r *revidInst) setupInputForFile() error {
 	return nil
 }
 
+// testRtmp is useful to check robustness of connections. Intended to be run as
+// goroutine. After every 'delayTime' the rtmp connection is ended and then
+// restarted
 func (r *revidInst)testRtmp(delayTime uint){
 	for {
 		time.Sleep(time.Duration(delayTime)*time.Millisecond)
@@ -501,23 +505,29 @@ func (r *revidInst)testRtmp(delayTime uint){
 	}
 }
 
+
 // readCamera reads data from the defined camera while the revidInst is running.
+// TODO: use ringbuffer here instead of allocating mem every time!
 func (r *revidInst) readCamera() {
 	r.Log(Info, "Reading camera data!")
 	for r.isRunning {
 		data := make([]byte, 1)
 		_, err := io.ReadFull(r.inputReader, data)
 		switch {
+		// We know this means we're getting nothing from the cam
 		case err != nil && err.Error() == "EOF" && r.isRunning:
 			r.Log(Error, "No data from camera!")
 			time.Sleep(5 * time.Second)
+		// We don't know what this one is, so let's just output the error to the log
 		case err != nil && r.isRunning:
 			r.Log(Error, err.Error())
+		// Everything is fine! send the data to the parser to split it up into
+		// frames/access units
 		default:
 			r.parser.GetInputChan() <- data[0]
 		}
 	}
-	r.Log(Info, "Out of reading routine!")
+	r.Log(Info, "Not trying to read from camera anymore!")
 }
 
 // readFile reads data from the defined file while the revidInst is running.

revid/revid_test.go

@@ -1,16 +1,15 @@
 /*
 NAME
-  MpegTs.go - provides a data structure intended to encapsulate the properties
+  revid_test.go
-  of an MpegTs packet.
 
 DESCRIPTION
   See Readme.md
 
 AUTHOR
-  Saxon Nelson-Milton <saxon.milton@gmail.com>
+  Saxon Nelson-Milton <saxon@ausocean.org>
 
 LICENSE
-  MpegTs.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
+  revid_test.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
 
   It is free software: you can redistribute it and/or modify them
   under the terms of the GNU General Public License as published by the
@@ -33,7 +32,7 @@ import (
 	"time"
 )
 
-/*
+
 // Test revidInst with a file input
 func TestFileInput(t *testing.T){
 	config := Config{
@@ -94,9 +93,9 @@ func TestRaspividMJPEGInput(t *testing.T){
   time.Sleep(20*time.Second)
   revidInst.Stop()
 }
-*/
 
-/*
+
+
 // Test revidInst with rtmp output
 func TestRtmpOutput(t *testing.T){
   config := Config{
@@ -120,9 +119,9 @@ func TestRtmpOutput(t *testing.T){
   time.Sleep(120*time.Second)
   revidInst.Stop()
 }
-*/
 
-/*
+
+
 // Test h264 inputfile to flv output files
 func TestFlvOutputFile(t *testing.T) {
 	config := Config{
@@ -143,7 +142,7 @@ func TestFlvOutputFile(t *testing.T) {
 	time.Sleep(30 * time.Second)
 	revidInst.Stop()
 }
-*/
+
 
 // Test h264 inputfile to flv format into rtmp using librtmp c wrapper
 func TestRtmpOutputUsingLibRtmp(t *testing.T){