linux – 监听音频线

概述我需要在 linux上监听我的音频线路,并且在音频播放的情况下,声音必须被记录并保存到一个文件中.类似于 motion如何监视视频Feed. 有可能用bash吗？一些沿着以下方向的东西： #!/bin/bash# audio devicedevice=/dev/audio-line-in# below this threshold audio will not be recorded. 我需要在 linux上监听我的音频线路,并且在音频播放的情况下,声音必须被记录并保存到一个文件中.类似于 motion如何监视视频Feed.

有可能用bash吗？一些沿着以下方向的东西：

#!/bin/bash# audio devicedevice=/dev/audio-line-in# below this threshold audio will not be recorded.noise_threshold=10# folder where recordings are storedstorage_folder=~/recordings# run indefenitly,until Ctrl-C is pressedwhile true; do   # noise_level() represents a function to determine   # the noise level from device   if noise_level( $device ) > $noise_threshold; then     # stream from device to file,can be encoded to mp3 later.     cat $device > $storage_folder/$(date +%FT%T).raw            fi;done;

编辑：我想从这个程序获得的流程是

a. when noise > threshold,start recording   b. stop recording when noise < threshold for 10 seconds c. save recorded pIEce to separate file

解决方法 SoX是瑞士军刀的声音处理.您可以利用它来分析录音.以下解决方案的唯一缺点是：

>您需要将录音分割成固定大小的块
>您可能会丢失录音时间(由于杀死/分析/重新启动录音)

因此,进一步的改进可能是分析异步,尽管这将使工作复杂化.

#!/bin/bash record_interval=5noise_threshold=3storage_folder=~/recordingsexec 2>/dev/null        # no default  error outputwhile true; do     rec out.wav &    sleep $record_interval    kill -KILL %1    max_level="$(sox  out.wav -n stats -s 16 2>&1|awk '/^Max\ level/ {print int()}')"    if [ $max_level -gt $noise_threshold ];then     mv out.wav ${storage_folder}/recording-$(date +%FT%T).wav;    else     rm out.wav    fidone

更新：

以下解决方案使用fifo作为rec的输出.通过在这个管道上使用拆分来获取块,应该没有丢失录音时间：

#!/bin/bash noise_threshold=3storage_folder=~/recordingsraw_folder=~/recordings/tmpsplit_folder=~/recordings/splitsox_raw_options="-t raw -r 48k -e signed -b 16"split_size=1048576 # 1Mmkdir -p ${raw_folder} ${split_folder}test -a ${raw_folder}/in.raw ||  mkfifo ${raw_folder}/in.raw# start recording and spliting in backgroundrec ${sox_raw_options} - >${raw_folder}/in.raw 2>/dev/null &split -b ${split_size} - <${raw_folder}/in.raw ${split_folder}/pIEce &while true; do     # check each finished raw file    for raw in $(find ${split_folder} -size ${split_size}c);do     max_level="$(sox $sox_raw_options  ${raw} -n stats -s 16 2>&1|awk '/^Max\ level/ {print int()}')"    if [ $max_level -gt $noise_threshold ];then         sox ${sox_raw_options} ${raw} ${storage_folder}/recording-$(date +%FT%T).wav;    fi    rm ${raw}    done    sleep 1done1

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