av/revid/audio_linux.go

79 lines
2.1 KiB
Go

/*
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"
)
// Used to reliably read, write, and test audio metadata entry keys.
const (
SampleRateStr = "sampleRate"
ChannelsStr = "channels"
PeriodStr = "period"
BitDepthStr = "bitDepth"
CodecStr = "codec"
)
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(SampleRateStr, strconv.Itoa(int(r.cfg.SampleRate)))
mts.Meta.Add(ChannelsStr, strconv.Itoa(int(r.cfg.Channels)))
mts.Meta.Add(PeriodStr, fmt.Sprintf("%.6f", r.cfg.RecPeriod))
mts.Meta.Add(BitDepthStr, strconv.Itoa(int(r.cfg.BitDepth)))
mts.Meta.Add(CodecStr, r.cfg.InputCodec.String())
return nil
}