/* NAME pcm_test.go DESCRIPTION pcm_test.go contains functions for testing the pcm package. AUTHOR Trek Hopton LICENSE pcm_test.go is Copyright (C) 2018 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 in gpl.txt. If not, see [GNU licenses](http://www.gnu.org/licenses). */ package pcm import ( "bytes" "io/ioutil" "log" "testing" "github.com/yobert/alsa" ) // TestResample tests the Resample function using a pcm file that contains audio of a freq. sweep. // The output of the Resample function is compared with a file containing the expected result. func TestResample(t *testing.T) { inPath := "../../../test/test-data/av/input/sweep_400Hz_20000Hz_-3dBFS_5s_48khz.pcm" expPath := "../../../test/test-data/av/output/sweep_400Hz_20000Hz_resampled_48to8kHz.pcm" // Read input pcm. inPcm, err := ioutil.ReadFile(inPath) if err != nil { log.Fatal(err) } format := alsa.BufferFormat{ Channels: 1, Rate: 48000, SampleFormat: alsa.S16_LE, } buf := alsa.Buffer{ Format: format, Data: inPcm, } // Resample pcm. resampled, err := Resample(buf, 8000) if err != nil { log.Fatal(err) } // Read expected resampled pcm. exp, err := ioutil.ReadFile(expPath) if err != nil { log.Fatal(err) } // Compare result with expected. if !bytes.Equal(resampled, exp) { t.Error("Resampled data does not match expected result.") } } // TestStereoToMono tests the StereoToMono function using a pcm file that contains stereo audio. // The output of the StereoToMono function is compared with a file containing the expected mono audio. func TestStereoToMono(t *testing.T) { inPath := "../../../test/test-data/av/input/stereo_DTMF_tones.pcm" expPath := "../../../test/test-data/av/output/mono_DTMF_tones.pcm" // Read input pcm. inPcm, err := ioutil.ReadFile(inPath) if err != nil { log.Fatal(err) } format := alsa.BufferFormat{ Channels: 2, Rate: 44100, SampleFormat: alsa.S16_LE, } buf := alsa.Buffer{ Format: format, Data: inPcm, } // Convert audio. mono, err := StereoToMono(buf) if err != nil { log.Fatal(err) } // Read expected mono pcm. exp, err := ioutil.ReadFile(expPath) if err != nil { log.Fatal(err) } // Compare result with expected. if !bytes.Equal(mono, exp) { t.Error("Converted data does not match expected result.") } }