7

When practicing piano, TEMPO (an app on iOS, CHplay) is a metronome that often be used to beat on time.

I can make animated GIF/PDF/SVG/frame (in beamer) for TEMPO, but don't know how to play a sound (for example beep 8, mp3 or wav in here) at each beat.

Can anyone help (with full code and clear explanation)? Thank you!

enter image description here

The following code are my MWEs. (these are good examples on animated things)

% TEMPO for piano tempo.tex
% for animated GIF, run on command line (require ImageMagick installed)
% magick -density 200 -delay 100 tempo.pdf tempo.gif
% -delay 100 >>> each frame is 100/100 = 1 second 
\documentclass[tikz]{standalone}
\begin{document}
\foreach \n in {1,...,4}{
\pagecolor{white}
\begin{tikzpicture}
\path (0,-1) rectangle (5,1);
\shade[inner color=green,outer color=green!10] 
(\n,0) circle(.5);
\foreach \i in {1,...,4}
\fill[cyan] (\i,0) circle(.3);
\end{tikzpicture}
}
\end{document}

With minor changes, we can get animated PDF (open in Acrobat Reader).

% animated PDF standalone tempopdf.tex
% \multiframe{4}{n=1+1} >>> starting frame is with n=1, 
% then plus 1 each frame, so we have 4 frames
% [loop,controls]{1} >>> number 1 means 1 second each frame
\documentclass{standalone}
\usepackage{tikz}
\usepackage{animate}
\begin{document}
\begin{animateinline}[loop,controls]{1}
\multiframe{4}{n=1+1}
{
\begin{tikzpicture}
\path (0,-1) rectangle (5,1);
\shade[inner color=green,outer color=green!10] 
(\n,0) circle(.6);
\foreach \i in {1,...,4}
\fill[cyan] (\i,0) circle(.3);
\end{tikzpicture}
}
\end{animateinline}
\end{document}

Animated PDF frame in beamer (open with Acrobat Reader)

% animated PDF frame in beamer (open with Acrobat Reader)
\documentclass{beamer}
\usepackage{tikz}
\usepackage{animate}
\usepackage{multimedia}
\begin{document}
\begin{frame}{TEMPO for piano}
\begin{center}
\begin{animateinline}[loop,controls]{1}
\multiframe{4}{n=1+1}
{
\begin{tikzpicture}
\path (0,-1) rectangle (5,1);
\shade[inner color=green,outer color=green!10] (\n,0) circle(.6);
\foreach \i in {1,...,4} \fill[cyan] (\i,0) circle(.3);
\end{tikzpicture}
}
\end{animateinline}
\end{center}
\end{frame} 
\end{document}
11

Click on the image below to see the ticking metronome (SVG version) in action:

https://agrahn.gitlab.io/svg/tempoForWeb-2.1.svg

This animate-based example comes in two versions.

The PDF version requires Acrobat Reader and is thus restricted to Windows and OSX platforms for desktop PCs. (Mobile devices are not supported.) The PDF version uses media9 for playing the embedded sound file click.mp3, taken from the animate package which already provides a ticking metronome example in its manual.

The standalone SVG version runs in most contemporary Web browsers (Firefox, Chrome, Opera ...), even on mobile devices. Here, the sound is embedded as a Base64-encoded Blob using the HTML5 <audio> tag. (click.mp3 was encoded with "base64 click.mp3" on the command line.) The physically embedded sound file makes the SVG self-contained.

In either case, playback of the sound is started by JavaScript on every frame change of the running animation. The "timeline" feature of animate is used to associate the JS code with each frame (timeline input frames.txt).

The tempo marker is implemented with a second animateinline environment. It provides 39 typical metronome speeds that can be stepped trough with the +/- buttons. The buttons make use of the animate JavaScript interface to increment and decrement the tempo marker frame number. Another timeline file, tempo.txt, associates each marker frame with a JS snippet that scales the metronome speed accordingly, again using the JS interface of animate.

PDF version, to be compiled with pdflatex, lualatex, latex+dvips+ps2pdf, or xelatex:

\documentclass[varwidth,border=12pt]{standalone}

\usepackage{tikz}
\usepackage{animate}
\usepackage{media9}
\usepackage{fontawesome5}

% tempo markers
\def\tempos{{40,42,44,46,48,50,52,54,56,58,60,63,66,69,72,76,80,84,88,92,96,100,104,108,112,116,120,126,132,138,144,152,160,168,176,184,192,200,208}}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% timeline files
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% metronome
\usepackage{filecontents}
\begin{filecontents*}{frames.txt}
::0: annotRM['click'].callAS('play');
::1: annotRM['click'].callAS('play');
::2: annotRM['click'].callAS('play');
::3: annotRM['click'].callAS('play');
\end{filecontents*}
% tempo
\newwrite\TimeLineFile
\immediate\openout\TimeLineFile=tempo.txt
\foreach \i in {0,1,...,38} {
    %JavaScript for scaling the metronome's default speed (60 frames per min)
    \pgfmathparse{\tempos[\i]/60}
    \immediate\write\TimeLineFile{::\i:anim.metronome.speed=\pgfmathresult;}
}
\immediate\closeout\TimeLineFile
%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\setlength{\textwidth}{4.4cm}

\begin{document}
\begin{center}
%the sound player  
\makebox[0pt][r]{\includemedia[
  width=1ex,height=1ex,
  label=click,
  addresource=click.mp3,
  activate=pageopen,transparent,noplaybutton,
  flashvars={source=click.mp3&hideBar=true}
]{}{APlayer.swf}}%
\makebox[4cm][l]{The \LaTeX{} Metronome}\\[1ex]

%%%%%%%%%%%
% metronome
%%%%%%%%%%%
\begin{animateinline}[label=metronome,nomouse,loop,timeline=frames.txt]{1}
  \multiframe{4}{n=1+1}{
    \begin{tikzpicture}
      \path (0.3,-0.5) rectangle (4.7,0.5);
      \shade[inner color=green,outer color=green!10] (\n,0) circle(.6);
      \foreach \i in {1,...,4} \fill[cyan] (\i,0) circle(.3);
    \end{tikzpicture}
  }
\end{animateinline}

%%%%%%%%%%%
% controls
%%%%%%%%%%%
\makebox[4cm]{%
\mediabutton[
  jsaction={
    if(anim.metronome.isPlaying) anim.metronome.stopFirst(); 
    else anim.metronome.playFwd();
  }
]{\faPowerOff}\hfill
% tempo
\mediabutton[
  jsaction={ try {--anim.tempo.frameNum;} catch (e) {} }
]{\faMinusCircle}\,%
\begin{animateinline}[label=tempo,step,nomouse,poster=10,timeline=tempo.txt]{1}
  \multiframe{39}{i=0+1}{
    \pgfmathparse{\tempos[\i]}
    \makebox[\widthof{000}][c]{\strut\pgfmathresult}
  }
\end{animateinline}\,%
\mediabutton[
  jsaction={ try {++anim.tempo.frameNum;} catch (e) {} }
]{\faPlusCircle}}
\end{center}
\end{document}

SVG version, to be compiled with

latex tempoForWeb.tex
latex tempoForWeb.tex
dvisvgm --font-format=woff --exact --zoom=-1 tempoForWeb.dvi

The SVG can be viewed standalone in a Web browser, or embedded into a Web page by means of the <object> HTML tag:

\documentclass[dvisvgm,varwidth,preview]{standalone}

\usepackage{tikz}
\usepackage{animate}
\usepackage{fontawesome5}

% tempo markers
\def\tempos{{40,42,44,46,48,50,52,54,56,58,60,63,66,69,72,76,80,84,88,92,96,100,104,108,112,116,120,126,132,138,144,152,160,168,176,184,192,200,208}}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% timeline files
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% metronome
\usepackage{filecontents}
\begin{filecontents*}{frames.txt}
::0:$('click').play();
::1:$('click').play();
::2:$('click').play();
::3:$('click').play();
\end{filecontents*}
% tempo
\newwrite\TimeLineFile
\immediate\openout\TimeLineFile=tempo.txt
\foreach \i in {0,1,...,38} {
    %JavaScript for scaling the metronome's default speed (60 frames per min)
    \pgfmathparse{\tempos[\i]/60}
    \immediate\write\TimeLineFile{::\i:anim.metronome.speed=\pgfmathresult;}
}
\immediate\closeout\TimeLineFile
%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% for producing push buttons
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ExplSyntaxOn
\def\controlButton#1#2{% #1:button face, #2 JavaScript
  \sbox{0}{#1}
  \makebox[0pt][l]{\usebox{0}}
  \pbs_pdfannot:nnnn{\wd0}{\ht0}{\dp0}{cursor='pointer'~onmousedown='#2'}
  \phantom{\usebox{0}}
}
\ExplSyntaxOff
%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\setlength{\textwidth}{4.4cm}

\begin{document}
% embed sound
\special{dvisvgm:rawdef
  <audio xmlns="http://www.w3.org/1999/xhtml" id='click'>
    <source
    src="data:audio/mpeg;base64,
    SUQzBAAAAAAAOlRJVDIAAAAHAAADY2xpY2sAVERSTAAAAAYAAAMyMDA4AFRTU0UAAAAPAAADTGF2
    ZjUzLjMyLjEwMAD/+5DAAAAAAAAAAAAAAAAAAAAAAABYaW5nAAAABwAAAAUAAAnKAFVVVVVVVVVV
    VVVVVVVVVVVVVVV/f39/f39/f39/f39/f39/f39/f6qqqqqqqqqqqqqqqqqqqqqqqqqq1dXV1dXV
    1dXV1dXV1dXV1dXV1dX//////////////////////////wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAD/+5DEAAAUjaVe1JYACx40rvMw8ABACACTCHXF
    YJgmG27XRo51BcA4AABBEMFixYsPDMzXv3mb3WLFhgYGCzl5gYOde973WOdq9evfxevXv3mZ2jCx
    Y5TtbWLHJve970669e/eb0pO3vf6L16+973v8zlKdNKXvd+9/ml74wsWLHKfOUpSk3pSjCw4MFjl
    7zM0pSl7zOUpSl73vNKUp83ve/4wvXv/lKUWL198ABkAd/AMPD/8f+uAYfHWXJSmU242sLUss7ay
    Un2Hl9HqQQKKuhNUEMwoZKsdD97mXj7TiWXCLRlUog4Z7JeI5bH4qoJcV9rXKLO5cNbKcqreQWh2
    qTo02rrDIw2anjA/Z77xC1/iM9iscSZ+yba2B/ApWjVEvjV4Wrb1M+v/2eA24Y2FypG0+mtJjT3F
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    3bdZcDksc/80LPs/5y7SLUBAACmAngSgKk6TELeQlCSZIYcJ2zKaGmKuBYEwRFP/+5LEEADWea9i
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    ynkikWExUujIAQTEJcUNgiwKQGEL5tuRPX0gZwLNIZjjZA08is0HSplCsWegIV9MHCFgLCd0+znV
    EaknrbrCtNWdbaUmp67AhwwrTo4cVQqD2NbS64eo0cfYpPVq8408MnaLDDR7WtLDqtPZZLDCW5SB
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    gECQ6T///w8oNyQ/wCxUBAEUQBwcAgSF9AbZCEQdMAgOLNFk/////iEorotoWJBgYMFAOBha6LMB
    ADC10ZAL0hsotgzSUhxMQU1FMy45OS4zqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq
    qqqqqqqqqqqq" type="audio/mpeg"/>
%    <source src="click.mp3" type="audio/mpeg"/> % alternatively: separate mp3
  </audio>
  <script type="text/javascript">
  <![CDATA[
    function $(id) {return document.getElementById(id);};
  ]]>
  </script>
}
\begin{center}
\makebox[4cm][l]{The \LaTeX{} Metronome}\\[1ex]

%%%%%%%%%%%
% metronome
%%%%%%%%%%%
\begin{animateinline}[label=metronome,nomouse,loop,timeline=frames.txt]{1}
  \multiframe{4}{n=1+1}{
    \begin{tikzpicture}
      \path (0.3,-0.5) rectangle (4.7,0.5);
      \shade[inner color=green,outer color=green!10] (\n,0) circle(.6);
      \foreach \i in {1,...,4} \fill[cyan] (\i,0) circle(.3);
    \end{tikzpicture}
  }
\end{animateinline}

%%%%%%%%%%%
% controls
%%%%%%%%%%%
\makebox[4cm]{%
\controlButton{\faPowerOff}{%
  if(anim.metronome.isPlaying) anim.metronome.stopFirst(); 
  else anim.metronome.playFwd();
}\hfill
% tempo
\controlButton{\faMinusCircle}{%
  try {--anim.tempo.frameNum;} catch (e) {}
}\,%
\begin{animateinline}[label=tempo,step,nomouse,poster=10,timeline=tempo.txt]{1}
  \multiframe{39}{i=0+1}{
    \pgfmathparse{\tempos[\i]}
    \makebox[\widthof{000}][c]{\strut\pgfmathresult}
  }
\end{animateinline}\,%
\controlButton{\faPlusCircle}{%
  try {++anim.tempo.frameNum;} catch (e) {}
}}
\end{center}
\end{document}

Standalone, animated GIF is dumb and deaf, afaik, and there does not seem to exist an easily accessible method to synchronize an embedded Gif (in a Web page) with a sound. But SVG is much superior, since it is vectorial and thus freely scalable.

  • 1
    Wow, it is very beautiful. :-) +1 – Sebastiano Aug 12 at 14:25
  • 2
    @Sebastiano Oh, thank you! As for beauty, all credits go to Black Mild :-). Upvote his question too, please. – AlexG Aug 12 at 15:27
  • Done now for all the users :-) – Sebastiano Aug 12 at 15:36
  • 1
    @BlackMild Now it comes close to something usable. – AlexG Aug 15 at 21:41
  • 1
    @AlexG: Really love the new version! Now I can use you LaTeX metronome on my hand phone when practicing piano – Black Mild Aug 16 at 2:32
1

You can alternatively do the animation elsewhere with sound and add that to the Beamer Files. Beamer seems to have an multimedia package. Also movie15 seems to be promising.

Look at this thread about Multimedia/sound How to include audio file in PDF, maybe thats a valid startingpoint.

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