Raspberry Pi2での音声配信「USB Audio Device + FFserver」

$ lsusb
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
Bus 001 Device 004: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller
Bus 001 Device 005: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T

# 音声デバイスの優先度は以下のコマンドで確認ができます。
$ cat /proc/asound/modules
 0 snd_usb_audio
 1 snd_bcm2835

# git "-b バージョン"にて、特定のバージョンをclone
git clone git://source.ffmpeg.org/ffmpeg.git -b release/2.8
Cloning into 'ffmpeg'...
remote: Enumerating objects: 614118, done.
remote: Counting objects: 100% (614118/614118), done.
remote: Compressing objects: 100% (124386/124386), done.
remote: Total 614118 (delta 493889), reused 607415 (delta 488483)
Receiving objects: 100% (614118/614118), 120.29 MiB | 336.00 KiB/s, done.
Resolving deltas: 100% (493889/493889), done.
Checking out files: 100% (6584/6584), done.


# makeには時間がかかるため、screenを起動 @2021/01/20 11:40

screen -R FFSERVER
cd ./ffmpeg
./configure

make && sudo make install

# 数時間後に、ffserverが作成されるので、confファイルを/etcにcopy
sudo cp ./ffserver.conf /etc/

cat ./ffserver.conf

# Port on which the server is listening. You must select a different
# port from your standard HTTP web server if it is running on the same
# computer.
Port 8090

# Address on which the server is bound. Only useful if you have
# several network interfaces.
BindAddress 0.0.0.0

# Number of simultaneous HTTP connections that can be handled. It has
# to be defined *before* the MaxClients parameter, since it defines the
# MaxClients maximum limit.
MaxHTTPConnections 2000

# Number of simultaneous requests that can be handled. Since FFServer
# is very fast, it is more likely that you will want to leave this high
# and use MaxBandwidth, below.
MaxClients 1000

# This the maximum amount of kbit/sec that you are prepared to
# consume when streaming to clients.
MaxBandwidth 300
#MaxBandwidth 1000
#MaxBandwidth 50

# Access log file (uses standard Apache log file format)
# '-' is the standard output.
#CustomLog -
CustomLog /var/log/ffserver.log

# Suppress that if you want to launch ffserver as a daemon.
NoDaemon


##################################################################
# Definition of the live feeds. Each live feed contains one video
# and/or audio sequence coming from an ffmpeg encoder or another
# ffserver. This sequence may be encoded simultaneously with several
# codecs at several resolutions.

<Feed feed1.ffm>

# You must use 'ffmpeg' to send a live feed to ffserver. In this
# example, you can type:
#
# ffmpeg http://localhost:8090/feed1.ffm

# ffserver can also do time shifting. It means that it can stream any
# previously recorded live stream. The request should contain:
# "http://xxxx?date=[YYYY-MM-DDT][[HH:]MM:]SS[.m...]".You must specify
# a path where the feed is stored on disk. You also specify the
# maximum size of the feed, where zero means unlimited. Default:
# File=/tmp/feed_name.ffm FileMaxSize=5M
File /tmp/feed1.ffm
#FileMaxSize 200K
FileMaxSize 10000K

# You could specify
# ReadOnlyFile /saved/specialvideo.ffm
# This marks the file as readonly and it will not be deleted or updated.

# Specify launch in order to start ffmpeg automatically.
# First ffmpeg must be defined with an appropriate path if needed,
# after that options can follow, but avoid adding the http:// field
#Launch ffmpeg

# Only allow connections from localhost to the feed.
ACL allow 127.0.0.1

</Feed>


##################################################################
# Now you can define each stream which will be generated from the
# original audio and video stream. Each format has a filename (here
# 'test1.mpg'). FFServer will send this stream when answering a
# request containing this filename.

<Stream rpi2.mpg>

# coming from live feed 'feed1'
Feed feed1.ffm

# Format of the stream : you can choose among:
# mpeg       : MPEG-1 multiplexed video and audio
# mpegvideo  : only MPEG-1 video
# mp2        : MPEG-2 audio (use AudioCodec to select layer 2 and 3 codec)
# ogg        : Ogg format (Vorbis audio codec)
# rm         : RealNetworks-compatible stream. Multiplexed audio and video.
# ra         : RealNetworks-compatible stream. Audio only.
# mpjpeg     : Multipart JPEG (works with Netscape without any plugin)
# jpeg       : Generate a single JPEG image.
# asf        : ASF compatible streaming (Windows Media Player format).
# swf        : Macromedia Flash compatible stream
# avi        : AVI format (MPEG-4 video, MPEG audio sound)
#Format mpeg
Format mp2
#Format ogg -> NG
#Format swf -> NG

# Bitrate for the audio stream. Codecs usually support only a few
# different bitrates.
AudioBitRate 32
#AudioBitRate 16

# Number of audio channels: 1 = mono, 2 = stereo
AudioChannels 1

# Sampling frequency for audio. When using low bitrates, you should
# lower this frequency to 22050 or 11025. The supported frequencies
# depend on the selected audio codec.
#AudioSampleRate 44100
AudioSampleRate 22050

# Bitrate for the video stream
#VideoBitRate 64

# Ratecontrol buffer size
#VideoBufferSize 40

# Number of frames per second
#VideoFrameRate 3

# Size of the video frame: WxH (default: 160x128)
# The following abbreviations are defined: sqcif, qcif, cif, 4cif, qqvga,
# qvga, vga, svga, xga, uxga, qxga, sxga, qsxga, hsxga, wvga, wxga, wsxga,
# wuxga, woxga, wqsxga, wquxga, whsxga, whuxga, cga, ega, hd480, hd720,
# hd1080
#VideoSize 160x128

# Transmit only intra frames (useful for low bitrates, but kills frame rate).
#VideoIntraOnly

# If non-intra only, an intra frame is transmitted every VideoGopSize
# frames. Video synchronization can only begin at an intra frame.
#VideoGopSize 12

# More MPEG-4 parameters
# VideoHighQuality
# Video4MotionVector

# Choose your codecs:
AudioCodec mp2
#VideoCodec mpeg1video

# Suppress audio
#NoAudio

# Suppress video
NoVideo

#VideoQMin 3
#VideoQMax 31

# Set this to the number of seconds backwards in time to start. Note that
# most players will buffer 5-10 seconds of video, and also you need to allow
# for a keyframe to appear in the data stream.
Preroll 30

# ACL:

# You can allow ranges of addresses (or single addresses)
#ACL ALLOW <first address>

# You can deny ranges of addresses (or single addresses)
#ACL DENY <first address>

# You can repeat the ACL allow/deny as often as you like. It is on a per
# stream basis. The first match defines the action. If there are no matches,
# then the default is the inverse of the last ACL statement.
#
# Thus 'ACL allow localhost' only allows access from localhost.
# 'ACL deny 1.0.0.0 1.255.255.255' would deny the whole of network 1 and
# allow everybody else.

</Stream>


##################################################################
# Example streams


# Multipart JPEG

#<Stream test.mjpg>
#Feed feed1.ffm
#Format mpjpeg
#VideoFrameRate 2
#VideoIntraOnly
#NoAudio
#Strict -1
#</Stream>


# Single JPEG

#<Stream test.jpg>
#Feed feed1.ffm
#Format jpeg
#VideoFrameRate 2
#VideoIntraOnly
##VideoSize 352x240
#NoAudio
#Strict -1
#</Stream>


# Flash -> NG

#<Stream live.swf>
#Feed feed1.ffm
#Format swf
#VideoFrameRate 2
#VideoIntraOnly
#NoAudio
#NoVideo
#</Stream>


# ASF compatible

<Stream rpi2.asf>
Feed feed1.ffm
Format asf
VideoFrameRate 15
VideoSize 352x240
VideoBitRate 256
VideoBufferSize 40
VideoGopSize 30
AudioBitRate 64
StartSendOnKey
</Stream>


# MP3 audio

<Stream rpi2.mp3>
Feed feed1.ffm
Format mp2
AudioCodec mp2
#AudioBitRate 64
AudioBitRate 32
#AudioBitRate 16
AudioChannels 1
AudioSampleRate 44100
#AudioSampleRate 22050
PreRoll 500

NoVideo
</Stream>


# Ogg Vorbis audio

<Stream rpi2.ogg>
Feed feed1.ffm
Title "Stream title"
AudioBitRate 64
AudioChannels 2
AudioSampleRate 44100
NoVideo
</Stream>


# Real with audio only at 32 kbits

<Stream rpi2.ra>
Feed feed1.ffm
#Format rm
Format mp2
AudioBitRate 32
NoVideo
#PreRoll 50
PreRoll 5000
#NoAudio
</Stream>


# Real with audio and video at 64 kbits

#<Stream test.rm>
#Feed feed1.ffm
#Format rm
#AudioBitRate 32
#VideoBitRate 128
#VideoFrameRate 25
#VideoGopSize 25
#NoAudio
#</Stream>


##################################################################
# A stream coming from a file: you only need to set the input
# filename and optionally a new format. Supported conversions:
#    AVI -> ASF

#<Stream file.rm>
#File "/usr/local/httpd/htdocs/tlive.rm"
#NoAudio
#</Stream>

#<Stream file.asf>
#File "/usr/local/httpd/htdocs/test.asf"
#NoAudio
#Author "Me"
#Copyright "Super MegaCorp"
#Title "Test stream from disk"
#Comment "Test comment"
#</Stream>


##################################################################
# RTSP examples
#
# You can access this stream with the RTSP URL:
#   rtsp://localhost:5454/test1-rtsp.mpg
#
# A non-standard RTSP redirector is also created. Its URL is:
#   http://localhost:8090/test1-rtsp.rtsp

#<Stream test1-rtsp.mpg>
#Format rtp
#File "/usr/local/httpd/htdocs/test1.mpg"
#</Stream>


# Transcode an incoming live feed to another live feed,
# using libx264 and video presets

#<Stream live.h264>
#Format rtp
#Feed feed1.ffm
#VideoCodec libx264
#VideoFrameRate 24
#VideoBitRate 100
#VideoSize 480x272
#AVPresetVideo default
#AVPresetVideo baseline
#AVOptionVideo flags +global_header
#
#AudioCodec libfaac
#AudioBitRate 32
#AudioChannels 2
#AudioSampleRate 22050
#AVOptionAudio flags +global_header
#</Stream>

##################################################################
# SDP/multicast examples
#
# If you want to send your stream in multicast, you must set the
# multicast address with MulticastAddress. The port and the TTL can
# also be set.
#
# An SDP file is automatically generated by ffserver by adding the
# 'sdp' extension to the stream name (here
# http://localhost:8090/test1-sdp.sdp). You should usually give this
# file to your player to play the stream.
#
# The 'NoLoop' option can be used to avoid looping when the stream is
# terminated.

#<Stream test1-sdp.mpg>
#Format rtp
#File "/usr/local/httpd/htdocs/test1.mpg"
#MulticastAddress 224.124.0.1
#MulticastPort 5000
#MulticastTTL 16
#NoLoop
#</Stream>


##################################################################
# Special streams

# Server status

<Stream stat.html>
Format status

# Only allow local people to get the status
ACL allow localhost
ACL allow 192.168.0.0 192.168.255.255

#FaviconURL http://pond1.gladstonefamily.net:8080/favicon.ico
</Stream>


# Redirect index.html to the appropriate site

<Redirect index.html>
 URL http://www.ffmpeg.org/
</Redirect>

/usr/local/bin/ffserver -f /etc/ffserver/ffserver.conf >> /tmp/FFserver_streaming.log

Starting ffmpeg
ffmpeg version n3.4.8-5-g8f5e16b5f1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration:
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
Unknown input format: 'alsa'

sudo apt-get install libasound2-dev
cd ~/ffmpeg

./configure
 ... alsa! ..

make
./ffmpeg -formats |grep alsa
 ...  DE alsa! .. (the D/E columns indicate both directions are working

sudo make install

Starting ffmpeg
ffmpeg version n2.8.17 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration:
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
[alsa @ 0x2a32390] cannot open audio device hw:0,0 (No such file or directory)
hw:0,0: Input/output error

sudo aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 1: Set [C-Media USB Headphone Set], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

# FFmpeg実行 
sudo /usr/local/bin/ffmpeg -ac 1 -f alsa -ar 4000 -i "hw:1,0" -acodec mp2 -ab 32k -ac 1 http://localhost:8090/feed1.ffm

ffmpeg version n2.8.17 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration:
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
Guessed Channel Layout for  Input Stream #0.0 : mono
Input #0, alsa, from 'hw:1,0':
  Duration: N/A, start: 1611211271.855956, bitrate: 705 kb/s
    Stream #0:0: Audio: pcm_s16le, 44100 Hz, 1 channels, s16, 705 kb/s
Output #0, ffm, to 'http://127.0.0.1:8090/feed1.ffm':
  Metadata:
    creation_time   : 2021-01-21 15:41:11
    encoder         : Lavf56.40.101
    Stream #0:0: Audio: mp2, 22050 Hz, mono, s16, 32 kb/s
    Metadata:
      encoder         : Lavc56.60.100 mp2
    Stream #0:1: Audio: wmav2, 22050 Hz, mono, fltp, 64 kb/s
    Metadata:
      encoder         : Lavc56.60.100 wmav2
    Stream #0:2: Audio: mp2, 44100 Hz, mono, s16, 32 kb/s
    Metadata:
      encoder         : Lavc56.60.100 mp2
    Stream #0:3: Audio: flac, 44100 Hz, stereo, s16, 64 kb/s
    Metadata:
      encoder         : Lavc56.60.100 flac
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> mp2 (native))
  Stream #0:0 -> #0:1 (pcm_s16le (native) -> wmav2 (native))
  Stream #0:0 -> #0:2 (pcm_s16le (native) -> mp2 (native))
  Stream #0:0 -> #0:3 (pcm_s16le (native) -> flac (native))
Press [q] to stop, [?] for help
size=     984kB time=00:00:16.96 bitrate= 475.1kbits/s

#!/bin/bash

#prgfile=<Program Script filepath>

# FFserver
prgfile="/usr/local/bin/ffserver -f /etc/ffserver.conf > /dev/null 2>&1"
prgfile="/usr/local/bin/ffserver -loglevel quiet -f /etc/ffserver.conf > /dev/null 2>&1"
curdir="/home/USER/ffserver/"
prgtitle=ffserver
#pidfile=<PID filepath>
pidfile=/tmp/$prgtitle.pid

# FFmpeg
# x201
prgfile2="/usr/local/bin/ffmpeg -ac 2 -f alsa -ar 16000 -i default -loglevel quiet -acodec mp2 -ab 64k -ac 1 http://127.0.0.1:8090/feed1.ffm "
# Raspberry Pi
prgfile2="sudo /usr/local/bin/ffmpeg -ac 1 -f alsa -ar 4000 -i "hw:1,0" -loglevel quiet -acodec mp2 -ab 32k -ac 1 http://localhost:8090/feed1.ffm "
prgtitle2=ffmpeg
pidfile2=/tmp/$prgtitle2.pid

start() {
    if [ -f $pidfile ]; then
        pid=`cat $pidfile`
        kill -0 $pid >& /dev/null
        if [ $? -eq 0 ]; then
            echo "Daemon has started."
            return 1
        fi
    fi

    cd $curdir
    # Starting FFserver
    echo "Starting $prgfile"
    $prgfile &
    #pgrep -fl ffserver | awk '{print $1}' > $pidfile
    pgrep -fl $prgtitle | awk '{print $1}' > $pidfile

    # Starting FFmpeg
    sleep 1
    echo "Starting $prgfile2"
    $prgfile2 > /tmp/ffmpeg.log &
    #pgrep -fl ffserver | awk '{print $1}' > $pidfile2
    #pgrep -fl ffmpeg | awk '{print $1}' > $pidfile2
    pgrep -fl $prgtitle2 | awk '{print $1}' > $pidfile2

    if [ $? -eq 0 ]; then
        echo "Daemon started."
	pid=`cat $pidfile`
	pid2=`cat $pidfile2`
	echo "Daemon $prgtitle is started. (PID: ${pid})"
	echo "Daemon $prgtitle2 is started. (PID: ${pid2})"
        return 0
    else
        echo "Failed to start daemon."
        return 1
    fi
}

stop() {
    if [ ! -f $pidfile ]; then
        echo "Daemon not started."
        return 1
    fi

    pid=`cat $pidfile`
    pid2=`cat $pidfile2`
    kill $pid >& /dev/null
    if [ $? -ne 0 ]; then
        echo "Operation not permitted."
        return 1
    fi

    echo -n "Stopping daemon..."
    while true
    do
        kill -0 $pid >& /dev/null
        kill -0 $pid2 >& /dev/null
        if [ $? -ne 0 ]; then
            break
        fi

        sleep 2
        echo -n "."
    done

    rm -rf $pidfile
    rm -rf $pidfile2

    echo -e "\nDaemon stopped."
    return 0
}

status() {

    # FFserver
    if [ -f $pidfile ]; then
        pid=`cat $pidfile`
        pid2=`cat $pidfile2`
        kill -0 $pid >& /dev/null
        if [ $? -eq 0 ]; then
            echo "Daemon $prgtitle is running. (PID: ${pid})"
            echo "Daemon $prgtitle2 is running. (PID: ${pid2})"
            return 0
        else
            echo "Daemon might crash. (PID: ${pid} file remains)"
            return 1
        fi
    else
        echo "Daemon not started."
        return 0
    fi
}

restart() {
    stop
    if [ $? -ne 0 ]; then
        return 1
    fi

    sleep 2

    start
    return $?
}

case "$1" in
    start | stop | status | restart)
        $1
        ;;
    *)
        echo "Usage: $0 {start|stop|status|restart}"
        exit 2
esac

#exit $
exit 0