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opus_test.go
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opus_test.go
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// Copyright © 2015-2017 Go Opus Authors (see AUTHORS file)
//
// License for use of this code is detailed in the LICENSE file
package opus
import (
"strings"
"testing"
)
func TestVersion(t *testing.T) {
if ver := Version(); !strings.HasPrefix(ver, "libopus") {
t.Errorf("Unexpected linked libopus version: " + ver)
}
}
func TestOpusErrstr(t *testing.T) {
// I scooped this -1 up from opus_defines.h, it's OPUS_BAD_ARG. Not pretty,
// but it's better than not testing at all. Again, accessing #defines from
// CGO is not possible.
if ErrBadArg.Error() != "opus: invalid argument" {
t.Errorf("Expected \"invalid argument\" error message for error code %d: %v",
ErrBadArg, ErrBadArg)
}
}
func TestCodec(t *testing.T) {
// Create bogus input sound
const G4 = 391.995
const SAMPLE_RATE = 48000
const FRAME_SIZE_MS = 60
const FRAME_SIZE = SAMPLE_RATE * FRAME_SIZE_MS / 1000
pcm := make([]int16, FRAME_SIZE)
enc, err := NewEncoder(SAMPLE_RATE, 1, AppVoIP)
if err != nil || enc == nil {
t.Fatalf("Error creating new encoder: %v", err)
}
addSine(pcm, SAMPLE_RATE, G4)
data := make([]byte, 1000)
n, err := enc.Encode(pcm, data)
if err != nil {
t.Fatalf("Couldn't encode data: %v", err)
}
data = data[:n]
dec, err := NewDecoder(SAMPLE_RATE, 1)
if err != nil || dec == nil {
t.Fatalf("Error creating new decoder: %v", err)
}
n, err = dec.Decode(data, pcm)
if err != nil {
t.Fatalf("Couldn't decode data: %v", err)
}
if len(pcm) != n {
t.Fatalf("Length mismatch: %d samples in, %d out", len(pcm), n)
}
// Checking the output programmatically is seriously not easy. I checked it
// by hand and by ear, it looks fine. I'll just assume the API faithfully
// passes error codes through, and that's that.
}
func TestCodecFloat32(t *testing.T) {
// Create bogus input sound
const G4 = 391.995
const SAMPLE_RATE = 48000
const FRAME_SIZE_MS = 60
const FRAME_SIZE = SAMPLE_RATE * FRAME_SIZE_MS / 1000
pcm := make([]float32, FRAME_SIZE)
enc, err := NewEncoder(SAMPLE_RATE, 1, AppVoIP)
if err != nil || enc == nil {
t.Fatalf("Error creating new encoder: %v", err)
}
addSineFloat32(pcm, SAMPLE_RATE, G4)
data := make([]byte, 1000)
n, err := enc.EncodeFloat32(pcm, data)
if err != nil {
t.Fatalf("Couldn't encode data: %v", err)
}
dec, err := NewDecoder(SAMPLE_RATE, 1)
if err != nil || dec == nil {
t.Fatalf("Error creating new decoder: %v", err)
}
// TODO: Uh-oh.. it looks like I forgot to put a data = data[:n] here, yet
// the test is not failing. Why?
n, err = dec.DecodeFloat32(data, pcm)
if err != nil {
t.Fatalf("Couldn't decode data: %v", err)
}
if len(pcm) != n {
t.Fatalf("Length mismatch: %d samples in, %d out", len(pcm), n)
}
}
func TestCodecFEC(t *testing.T) {
// Create bogus input sound
const G4 = 391.995
const SAMPLE_RATE = 48000
const FRAME_SIZE_MS = 10
const FRAME_SIZE = SAMPLE_RATE * FRAME_SIZE_MS / 1000
const NUMBER_OF_FRAMES = 6
pcm := make([]int16, 0)
enc, err := NewEncoder(SAMPLE_RATE, 1, AppVoIP)
if err != nil || enc == nil {
t.Fatalf("Error creating new encoder: %v", err)
}
enc.SetPacketLossPerc(30)
enc.SetInBandFEC(true)
dec, err := NewDecoder(SAMPLE_RATE, 1)
if err != nil || dec == nil {
t.Fatalf("Error creating new decoder: %v", err)
}
mono := make([]int16, FRAME_SIZE*NUMBER_OF_FRAMES)
addSine(mono, SAMPLE_RATE, G4)
encodedData := make([][]byte, NUMBER_OF_FRAMES)
for i, idx := 0, 0; i < len(mono); i += FRAME_SIZE {
data := make([]byte, 1000)
n, err := enc.Encode(mono[i:i+FRAME_SIZE], data)
if err != nil {
t.Fatalf("Couldn't encode data: %v", err)
}
data = data[:n]
encodedData[idx] = data
idx++
}
lost := false
for i := 0; i < len(encodedData); i++ {
// "Dropping" packets 2 and 4
if i == 2 || i == 4 {
lost = true
continue
}
if lost {
samples, err := dec.LastPacketDuration()
if err != nil {
t.Fatalf("Couldn't get last packet duration: %v", err)
}
pcmBuffer := make([]int16, samples)
if err = dec.DecodeFEC(encodedData[i], pcmBuffer); err != nil {
t.Fatalf("Couldn't decode data: %v", err)
}
pcm = append(pcm, pcmBuffer...)
lost = false
}
pcmBuffer := make([]int16, NUMBER_OF_FRAMES*FRAME_SIZE)
n, err := dec.Decode(encodedData[i], pcmBuffer)
if err != nil {
t.Fatalf("Couldn't decode data: %v", err)
}
pcmBuffer = pcmBuffer[:n]
if n != FRAME_SIZE {
t.Fatalf("Length mismatch: %d samples expected, %d out", FRAME_SIZE, n)
}
pcm = append(pcm, pcmBuffer...)
}
if len(mono) != len(pcm) {
t.Fatalf("Input/Output length mismatch: %d samples in, %d out", len(mono), len(pcm))
}
// Commented out for the same reason as in TestStereo
/*
fmt.Printf("in,out\n")
for i := range mono {
fmt.Printf("%d,%d\n", mono[i], pcm[i])
}
*/
}
func TestCodecFECFloat32(t *testing.T) {
// Create bogus input sound
const G4 = 391.995
const SAMPLE_RATE = 48000
const FRAME_SIZE_MS = 10
const FRAME_SIZE = SAMPLE_RATE * FRAME_SIZE_MS / 1000
const NUMBER_OF_FRAMES = 6
pcm := make([]float32, 0)
enc, err := NewEncoder(SAMPLE_RATE, 1, AppVoIP)
if err != nil || enc == nil {
t.Fatalf("Error creating new encoder: %v", err)
}
enc.SetPacketLossPerc(30)
enc.SetInBandFEC(true)
dec, err := NewDecoder(SAMPLE_RATE, 1)
if err != nil || dec == nil {
t.Fatalf("Error creating new decoder: %v", err)
}
mono := make([]float32, FRAME_SIZE*NUMBER_OF_FRAMES)
addSineFloat32(mono, SAMPLE_RATE, G4)
encodedData := make([][]byte, NUMBER_OF_FRAMES)
for i, idx := 0, 0; i < len(mono); i += FRAME_SIZE {
data := make([]byte, 1000)
n, err := enc.EncodeFloat32(mono[i:i+FRAME_SIZE], data)
if err != nil {
t.Fatalf("Couldn't encode data: %v", err)
}
data = data[:n]
encodedData[idx] = data
idx++
}
lost := false
for i := 0; i < len(encodedData); i++ {
// "Dropping" packets 2 and 4
if i == 2 || i == 4 {
lost = true
continue
}
if lost {
samples, err := dec.LastPacketDuration()
if err != nil {
t.Fatalf("Couldn't get last packet duration: %v", err)
}
pcmBuffer := make([]float32, samples)
if err = dec.DecodeFECFloat32(encodedData[i], pcmBuffer); err != nil {
t.Fatalf("Couldn't decode data: %v", err)
}
pcm = append(pcm, pcmBuffer...)
lost = false
}
pcmBuffer := make([]float32, NUMBER_OF_FRAMES*FRAME_SIZE)
n, err := dec.DecodeFloat32(encodedData[i], pcmBuffer)
if err != nil {
t.Fatalf("Couldn't decode data: %v", err)
}
pcmBuffer = pcmBuffer[:n]
if n != FRAME_SIZE {
t.Fatalf("Length mismatch: %d samples expected, %d out", FRAME_SIZE, n)
}
pcm = append(pcm, pcmBuffer...)
}
if len(mono) != len(pcm) {
t.Fatalf("Input/Output length mismatch: %d samples in, %d out", len(mono), len(pcm))
}
// Commented out for the same reason as in TestStereo
/*
fmt.Printf("in,out\n")
for i := 0; i < len(mono); i++ {
fmt.Printf("%f,%f\n", mono[i], pcm[i])
}
*/
}
func TestStereo(t *testing.T) {
// Create bogus input sound
const G4 = 391.995
const E3 = 164.814
const SAMPLE_RATE = 48000
const FRAME_SIZE_MS = 60
const CHANNELS = 2
const FRAME_SIZE_MONO = SAMPLE_RATE * FRAME_SIZE_MS / 1000
enc, err := NewEncoder(SAMPLE_RATE, CHANNELS, AppVoIP)
if err != nil || enc == nil {
t.Fatalf("Error creating new encoder: %v", err)
}
dec, err := NewDecoder(SAMPLE_RATE, CHANNELS)
if err != nil || dec == nil {
t.Fatalf("Error creating new decoder: %v", err)
}
// Source signal (left G4, right E3)
left := make([]int16, FRAME_SIZE_MONO)
right := make([]int16, FRAME_SIZE_MONO)
addSine(left, SAMPLE_RATE, G4)
addSine(right, SAMPLE_RATE, E3)
pcm := interleave(left, right)
data := make([]byte, 1000)
n, err := enc.Encode(pcm, data)
if err != nil {
t.Fatalf("Couldn't encode data: %v", err)
}
data = data[:n]
n, err = dec.Decode(data, pcm)
if err != nil {
t.Fatalf("Couldn't decode data: %v", err)
}
if n*CHANNELS != len(pcm) {
t.Fatalf("Length mismatch: %d samples in, %d out", len(pcm), n*CHANNELS)
}
// This is hard to check programatically, but I plotted the graphs in a
// spreadsheet and it looked great. The encoded waves both start out with a
// string of zero samples before they pick up, and the G4 is phase shifted
// by half a period, but that's all fine for lossy audio encoding.
/*
leftdec, rightdec := split(pcm)
fmt.Printf("left_in,left_out,right_in,right_out\n")
for i := range left {
fmt.Printf("%d,%d,%d,%d\n", left[i], leftdec[i], right[i], rightdec[i])
}
*/
}