/* NAME audio_linux.go AUTHORS Alan Noble <alan@ausocean.org> Trek Hopton <trek@ausocean.org> LICENSE revid is Copyright (C) 2019 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 http://www.gnu.org/licenses. */ package revid import ( "fmt" "strconv" "bitbucket.org/ausocean/av/codec/codecutil" "bitbucket.org/ausocean/av/container/mts" "bitbucket.org/ausocean/av/device" "bitbucket.org/ausocean/av/device/alsa" "bitbucket.org/ausocean/utils/logger" ) func (r *Revid) setupAudio() error { // Create new ALSA device. d := alsa.New(r.cfg.Logger) r.input = d // Configure ALSA device. r.cfg.Logger.Log(logger.Debug, "configuring input device") err := d.Setup(r.cfg) if _, ok := err.(device.MultiError); err != nil && ok { r.cfg.Logger.Log(logger.Warning, "errors from configuring input device", "errors", err) } else if err != nil { return err } r.cfg.Logger.Log(logger.Info, "input device configured") // Set revid's lexer. l, err := codecutil.NewByteLexer(d.DataSize()) if err != nil { return err } r.lexTo = l.Lex // Add metadata. mts.Meta.Add("sampleRate", strconv.Itoa(int(r.cfg.SampleRate))) mts.Meta.Add("channels", strconv.Itoa(int(r.cfg.Channels))) mts.Meta.Add("period", fmt.Sprintf("%.6f", r.cfg.RecPeriod)) mts.Meta.Add("bitDepth", strconv.Itoa(int(r.cfg.BitDepth))) switch r.cfg.InputCodec { case codecutil.PCM: mts.Meta.Add("codec", "pcm") case codecutil.ADPCM: mts.Meta.Add("codec", "adpcm") default: r.cfg.Logger.Log(logger.Fatal, "no audio codec set in config") } return nil }