220 26133 article Path: news.gmane.org!not-for-mail From: =?UTF-8?Q?Klaim_=2D_Jo=C3=ABl_Lamotte?= Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Any interest to adding audio support to the std library? Date: Fri, 3 Jun 2016 12:46:28 +0200 Lines: 821 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11442370639c4a05345d6fb9 X-Trace: ger.gmane.org 1464950805 20322 80.91.229.3 (3 Jun 2016 10:46:45 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 3 Jun 2016 10:46:45 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBD3NR2WQQ4IBBBWAYW5AKGQE5QCG4QA@isocpp.org Fri Jun 03 12:46:35 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lf0-f69.google.com ([209.85.215.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1b8mca-00051e-Uv for gclcip-std-proposals@m.gmane.org; Fri, 03 Jun 2016 12:46:33 +0200 Original-Received: by mail-lf0-f69.google.com with SMTP id 132sf35907959lfz.3 for ; Fri, 03 Jun 2016 03:46:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-spam-checked-in-group:list-post :list-help:list-archive:list-subscribe:list-unsubscribe; bh=nFd/CzgKknI2bzSW5it1IFSqMWGnFsK4zuHHzN/DM3A=; b=NS63dJ/7HoEGn8Satmo1StyRa0Ew2jA/Es/6BUxNPooUHNYohLC2CH16LOvuQCMOf8 KICU06sbIIOKk/MXOCZkWPuTnulCd9xcfvP80yeYlcN1wO/MbDL0ev50zb+oxTM0Q/9A vbe/K+NKO/5kMFPtOiED46UqLjZXK1u1lIixY2NOwPLN4EZP+lS52xsM4k/mtBXbDNB4 QXhhhpVOT8mPw6qvDNQoAKaRgZPFBvzkG+S3f756X3vGqNWnN++KV0Hmz9cDhOJEvzY8 bpL/FiyfGmEJC7PKc8Jw+SXWRs/viXNGfEPQNYOU/pc+9J0Mg/B6QaUgx29/brXKcwGt OeBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=nFd/CzgKknI2bzSW5it1IFSqMWGnFsK4zuHHzN/DM3A=; b=WEBRWhDw87YBn9mQcjUl76paedLffgiISPkCHe8KfAht8dFHFAxS65kzR5wXhSl+2j cdmpSzC+Qj2Wu5qG5Tm6onzNWzyHwwYB5XUhOAJPTdtvMPvKTYJ5uoUCZn33jgfDtVDJ pMNIXNV9PC4rF+MqDuk/QyHuCwHSx8QbT8ocZqJ5DEyrCrTfhmq9nIiYbTWatRrzTzMZ PP+X22elB3K/OHl2s+LtEtWn/Ssxct0oZntqoxEzIl82509ynrNDXG4q/2WlgU2TLtkk BfCKdWwCGmQnXOr6TK8O3RUHjv77M8GO3pLM1xxWJCKHjz5cep4xtH01WyTqnlZlYb/H wEQA== X-Gm-Message-State: ALyK8tLGjtvhUq5LCu59awVdCl+p9UR5obf3v2Q+o0uS3TVHHf00xGC3q+09kOZlXmVU2Q== X-Received: by 10.46.1.156 with SMTP id f28mr439664lji.6.1464950792332; Fri, 03 Jun 2016 03:46:32 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.29.209 with SMTP id d200ls284204wmd.20.gmail; Fri, 03 Jun 2016 03:46:30 -0700 (PDT) X-Received: by 10.194.104.102 with SMTP id gd6mr2779711wjb.170.1464950790275; Fri, 03 Jun 2016 03:46:30 -0700 (PDT) Original-Received: from mail-wm0-x22d.google.com (mail-wm0-x22d.google.com. [2a00:1450:400c:c09::22d]) by mx.google.com with ESMTPS id cb2si6795942wjc.188.2016.06.03.03.46.30 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 03 Jun 2016 03:46:30 -0700 (PDT) Received-SPF: pass (google.com: domain of mjklaim@gmail.com designates 2a00:1450:400c:c09::22d as permitted sender) client-ip=2a00:1450:400c:c09::22d; Original-Received: by mail-wm0-x22d.google.com with SMTP id z87so103162252wmh.0 for ; Fri, 03 Jun 2016 03:46:30 -0700 (PDT) X-Received: by 10.28.170.197 with SMTP id t188mr32429332wme.84.1464950788953; Fri, 03 Jun 2016 03:46:28 -0700 (PDT) Original-Received: by 10.195.19.35 with HTTP; Fri, 3 Jun 2016 03:46:28 -0700 (PDT) In-Reply-To: X-Original-Sender: mjklaim@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of mjklaim@gmail.com designates 2a00:1450:400c:c09::22d as permitted sender) smtp.mailfrom=mjklaim@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:26133 Archived-At: --001a11442370639c4a05345d6fb9 Content-Type: text/plain; charset=UTF-8 You might want to forward this at least to SG13 (HMI group). On 3 June 2016 at 11:37, wrote: > I have drafted some ideas on how I think the c++ std library could support > audio functionality. > > I know that audio functionality is a very operating specific problem, but > with the recent trend towards implementing a file-system library and > possibly a graphics library I believe that audio would not be too much of a > reach anymore. > > Here are some of the ideas I have so far. I have both some code examples > of the intended usage as well as a list of the types needed to implement > the given examples. > > Please keep in mind my drafts are still very rough. > > > CODE EXAMPLES > > //std::audio example 1 "single process" > void example_1(){ > double sample_rate = 44100; > std::size_t frame_size =2; > std::size_t buffer_size=128; > > std::audio_context ctx{sample_rate,buffer_size,frame_size};//contruct > from values > > std::astream_process proc(ctx,[](std::iastream const& input, > std::oastream& output){ > std::frame_buffer& buff = ctx.borrow_buffer();//borrow a > buffer from the context for usage > //prevents the need for dynamic allocation of a temporary buffer > input>>buff;//stream data into buffer for manipulation > for(auto&& frame: buff){ > frame=0.0;//do something with audio > } > output< });//dsp object > //uses implied routing equivilent to > //std::aout< // > > proc.start(); > //do other stuff > proc.stop(); > } > > //std::audio example 2 "process group" > void example_2(){ > > std::audio_context ctx;//default context created with > std::default_* values > > //version 1: capture context via lambda > std::astream_process proc1(ctx,[&ctx](std::iastream const& > input, std::oastream& output){ > std::frame_buffer& buff = ctx.borrow_buffer(); > input>>buff; > for(auto&& frame: buff){ > frame*=0.5; > } > output< });//dsp object > > //version 2: have context passed as argument > std::astream_process proc2(ctx,[](std::iastream const& input, > std::oastream& output,std::audio_context const& context){ > std::frame_buffer& buff = ctx.borrow_buffer(); > input>>buff; > for(auto&& frame: buff){ > frame*=2.0; > } > output< }); > > std::process_group pgroup;//a group of processes that will > happen consecutivley > pgroup.push(proc1);//add to group > pgroup.push(proc2);//add to group > > //configure stream relationships in terms of std::ain / std:aout > manually > //std::ain/std::aout are std::astream globals that refer to the > default audio inputs and outputs supplied by the context in use > //std::ain/std::aout will route the audio to the enpoint specified by > the context reference held by the process that is streaming the data > std::aout< //std::ain>>proc2>>proc1>>std::aout;//method 2 > > pgroup.start(); > //do other stuff > pgroup.stop(); > > } > > > //std::audio example 3 "audio files" > void example_3(){ > > std::audio_context ctx; > > std::astream_process proc(ctx,[](std::iafstream const& input, > std::oafstream& output){ > std::frame_buffer& buff = ctx.borrow_buffer(); > input>>buff; > for(auto&& frame: buff){ > frame=0.0; > } > output< });//dsp object > > std::iafstream audio_file1(ctx,"filename1.extension");//an audio file > handle > std::oafstream audio_file2(ctx,"filename2.extension");//an audio file > handle > > //routing > audio_file2< file > //audio_file1>>proc>>audio_file2;//equivilent syntax > proc.start(); > //do other stuff > proc.stop(); > } > > > //std::audio example 4 "combination routing" > void example_3(){ > > std::audio_context ctx; > //manually select hardware endpoints > std::size_t device_id = ctx.default_device_id(); > std::iastream input_device = ctx.get_device( > device_id); > std::oastream output_device = ctx.get_device( > device_id); > > std::astream_process proc(ctx,[](std::iastream const& input, > std::oastream& output, > std::iafstream const& > input_file, > std::oafstream& output_file){ > std::frame_buffer& buff = ctx.borrow_buffer(); > (input + input_file)>>buff;//add streams to perform sum before > writing to buffer > //or you could use seperate buffers > //like this > /* > std::frame_buffer buff1; > std::frame_buffer buff2; > > input>>buff1; > input_file>>buff2; > buff1+=buff2;//buffer arithmatic > */ > output< the file out > output_file< }); > > std::iafstream audio_file1(ctx,"filename1.extension");//the actual > files to be used above > std::oafstream audio_file2(ctx,"filename2.extension"); > > //connect the files to the process > //connect the hardware device to the process > audio_file2< output_device< proc.start(); > //do other stuff > proc.stop(); > } > > > > REQUIRED LIBRARY MEMBERS > > > namespace std{ > inline namespace audio{ > //working context for audio flow > template > class audio_context; > /* > *The context in which all audio data is centered. > *Contains: sampling rate, buffer size, frame size, etc... > *The values of ain,aout,afin,afout refer to the endpoints defined > by the context, when applied to routing on a porocess tied to the context > *think of a context as the program level driver object > */ > > //audio streams (think like std::fstream and its friends) > class astream;//audio stream > class oastream;//output audio stream > class iastream;//input audio stream > class oafstream;//output audio file stream > class iafstream;//input audio file stream > > > //stream endpoints > class ain;//audio input endpoint > class aout;//audio output endpoint > class afin;//audio file input endpoint > class afout//audio file output endpoint > > //stream processing > template > class astream_process;//a dsp process applied to a stream > > template > class process_group;//a group of processes that will act as one > > //containers > template > class frame_buffer;//a sequence container that is resizeable at > runtime, but only with explicit resize calls. contains frames(see below) > /*Implementation note on frame_buffer > *frame_buffer is intended to hold N number of frames which > themselves can hold M number of samples > *meaning that the total size in samples if frame_buffer = N * M > *ideally frame_buffers representation of its sample data will be > continuous in memory > */ > > template > class frame;//a container that holds samples, thin array wrapper > > > //hardware representation > class device;//an audio device as recognized by the OS > class input_device;//an input device > class output_device;//an output device > > // audio file formats > enum class afformat{ > raw,//raw headerless audio bytes, interpreted only by the > settings of the context. > //best used for temporary storage within the life of a context > wav, > flac//etc... > } > } > } > > > > -- > You received this message because you are subscribed to the Google Groups > "ISO C++ Standard - Future Proposals" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to std-proposals+unsubscribe@isocpp.org. > To post to this group, send email to std-proposals@isocpp.org. > To view this discussion on the web visit > https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/f490fd21-cf07-4d7b-8936-c71c97a1ab9d%40isocpp.org > > . > -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CAOU91OOHbnRDM0u2mcp-U04y85WvW7wbLr7xvR4zGBNG%3D7wfUg%40mail.gmail.com. --001a11442370639c4a05345d6fb9 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
You might want to forward this at least to SG13 (HMI group= ).



On 3 June 2016 at 11:37, <alexander.zywick= i@gmail.com> wrote:
I have drafted some ideas on how I think the c++ std library coul= d support audio functionality.

I know that audio functionality is a= very operating specific problem, but with the recent trend towards impleme= nting a file-system library and possibly a graphics library I believe that = audio would not be too much of a reach anymore.

Here are some of the= ideas I have so far. I have both some code examples of the intended usage = as well as a list of the types needed to implement the given examples.
<= br>Please keep in mind my drafts are still very rough.


CODE EXAM= PLES

//std::audio example 1 "single pro= cess"
void example_1(){
=C2=A0 =C2=A0 double sample_rate =3D 44= 100;=C2=A0 =C2=A0 std::size_t frame_size =3D= 2;
=C2=A0 =C2=A0 std::size_t buffer_size=3D128;

=C2=A0 =C2=A0 st= d::audi= o_context<float> ctx{sample_rate,buffer_size,<= span style=3D"color:#000">frame_size};//contruct from values

=C2=A0 =C2=A0 std::astream_process<float> proc(ctx,[](std::iastream const& input, std::oastream& output){
=C2=A0 =C2=A0 =C2=A0 =C2=A0 std::frame_buffer<float>& buff =3D ctx.borrow_buffer();//borrow a buffer from= the context for usage
=C2=A0 =C2=A0 = =C2=A0 =C2=A0 //prevents the need for dyn= amic allocation of a temporary buffer
= =C2=A0 =C2=A0 =C2=A0 =C2=A0 input>>= buff;//stream data into buffer for manipulation<= /span>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 for(auto&& frame: buff){
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 f= rame=3D= 0.0;//d= o something with audio
=C2=A0 =C2=A0 = =C2=A0 =C2=A0 }
=C2=A0 =C2=A0 =C2=A0 =C2=A0 output<<buff;//stream to output
=C2=A0 =C2=A0 }= );//dsp object
=C2=A0 =C2=A0 //uses implied r= outing equivilent to
=C2=A0 =C2=A0 //std::aout<<proc<<std::ain;
=C2=A0 =C2=A0 //

=C2=A0 =C2=A0 proc.start= ();
=C2=A0 = =C2=A0 //do other stuff
=C2=A0 =C2=A0 proc.stop();
}

//s= td::audio example 2 "process group"
void example_2(){

=C2=A0 =C2=A0 std::audio_context<float> ctx;//default context cre= ated with std::default_* values

= =C2=A0 =C2=A0 //version 1: capture contex= t via lambda
=C2=A0 =C2=A0 std<= span style=3D"color:#660">::astream_proce= ss<float> proc1(ctx,[&ctx](std::iastream const& input, std::oastream& output<= span style=3D"color:#660">){
=C2=A0 = =C2=A0 =C2=A0 =C2=A0 std::frame_buffer<float&= gt;& buff =3D ctx.borrow_buffer();
=C2=A0 =C2=A0 =C2=A0 =C2=A0 input>>buff;
=C2=A0 =C2=A0 =C2=A0 =C2= =A0 for= (auto&a= mp;& frame: buff){
=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 frame*=3D0.5;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
=C2=A0 =C2=A0 =C2=A0 =C2=A0 outp= ut<<buff;
=C2=A0 =C2=A0 });//dsp object

=C2= =A0 =C2=A0 //version 2: have context pass= ed as argument
=C2=A0 =C2=A0 std::astream_pro= cess<float> proc2(ctx,[](std::iastream const& input, std::oastream& output<= span style=3D"color:#660">,std::audio_context<float> const& context){
=C2=A0 =C2=A0 =C2=A0 =C2=A0= std::f= rame_buffer<float>& buff =3D ctx.borrow_buffer();
=C2=A0= =C2=A0 =C2=A0 =C2=A0 input>>buff;<= span style=3D"color:#000">
=C2=A0 =C2=A0 =C2=A0 =C2=A0 for(auto&& frame: buff){
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 frame<= /span>*=3D2.0<= /span>;
=C2= =A0 =C2=A0 =C2=A0 =C2=A0 }
=C2=A0 =C2=A0 =C2=A0 =C2=A0 output<<buff;
=C2=A0 =C2=A0 <= /span>});
<= br>=C2=A0 =C2=A0 std::process_group<float>= ; pgroup;//a group of processes that will happen= consecutivley
=C2=A0 =C2=A0 pgroup.push(proc1);//add to gr= oup
=C2=A0 =C2=A0 pgroup.push(proc2);//add to group<= span style=3D"color:#000">

=C2=A0 =C2=A0 //configure stream relationships in terms of std::ain / std:aout man= ually
=C2=A0 =C2=A0 //std::ain/std::aout are std::astream globals that refer to= the default audio inputs and outputs supplied by the context in use=
=C2=A0 =C2=A0 //std::ain/std::aout will route the audio to the enpoint specified by t= he context reference held by the process that is streaming the data<= span style=3D"color:#000">
=C2=A0 =C2=A0 std::aout<<proc1<<proc2<<std::ain;//method 1
=C2=A0 =C2=A0 = //std::ain>>proc2>>proc1>>std::aout;//method 2

=C2=A0 =C2=A0 pgroup.start();
=C2=A0 =C2=A0 //do other stuff=C2=A0 =C2=A0 pgroup.stop();

}


//std::audi= o example 3 "audio files"
void exam= ple_3(){

=C2=A0 =C2=A0 std::= audio_context&= lt;float> ctx;

=C2=A0 =C2=A0 std::astream_pro= cess<float> proc(ctx,[](std::iafstream const& input, std::oafstream& output= ){
=C2=A0 = =C2=A0 =C2=A0 =C2=A0 std::frame_buffer<float&= gt;& buff =3D ctx.borrow_buffer();
=C2=A0 =C2=A0 =C2=A0 =C2=A0 input>>buff;
=C2=A0 =C2=A0 =C2=A0 =C2= =A0 for= (auto&a= mp;& frame: buff){
=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 frame=3D0.0;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
=C2=A0 =C2=A0 =C2=A0 =C2=A0 outp= ut<<buff;
=C2=A0 =C2=A0 });//dsp object

=C2= =A0 =C2=A0 std::iafstream audio_file1(ctx,"filename1.extension");//an audio file handle
=C2=A0 =C2=A0 std::oafstream audio_file2(ctx,"filename2.ext= ension");//an audio file handle

=C2= =A0 =C2=A0 //routing
=C2=A0 =C2=A0 audio_file2<<proc<<audio_file1;//take input from file= nad write to file
=C2=A0 =C2=A0 //audio_file1>>proc>>audio_file2;/= /equivilent syntax
=C2=A0 =C2=A0 proc<= /span>.start();
= =C2=A0 =C2=A0 //do other stuff
=C2=A0 =C2=A0 proc.stop();
}


//std::audio example 4 "combination routing"
void example_3(){=

=C2=A0 =C2=A0 std::audio_context<= span style=3D"color:#080"><float> c= tx;
= =C2=A0 =C2=A0 //manually select hardware = endpoints
=C2=A0 =C2=A0 std::size_t device_id= =3D ct= x.defau= lt_device_id();
=C2=A0 =C2=A0 std::iastream input_device =3D ctx.get_device<std::input_device>(device_id);
=C2=A0 =C2= =A0 std::oastream output_device =3D ctx.get_device<<= span style=3D"color:#000">std::output_device>= (device_id);

=C2=A0 =C2=A0 std::astream_process<= /span><float> proc(ctx,[](std::iastream const& input,
=C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 std::oastream& output,
=C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 s= td::iaf= stream const& input_file,
=C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0std::oafstream& out= put_file){
=C2=A0 =C2=A0 =C2=A0 =C2=A0 std::<= /span>frame_buffer<float>& buff =3D ctx.borrow_buffer();
=C2=A0 =C2=A0 =C2=A0 =C2=A0 (input + input_file)>>buff= ;//add streams= to perform sum before writing to buffer<= br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 //or you c= ould use seperate buffers
=C2=A0 =C2= =A0 =C2=A0 =C2=A0 //like this
=C2=A0 =C2=A0 =C2=A0 =C2=A0 /*
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 std::frame_buf= fer<float> buff1;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 std::f= rame_buffer<float> buff2;

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 input>>buff1;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 inp= ut_file>>buff2;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 buff1+= =3Dbuff2;//buffer arithmatic
=C2=A0 =C2=A0 =C2=A0 =C2=A0 */
=C2=A0 =C2=A0 =C2=A0 =C2=A0 output<<buff;//send the conten= ts of buff to the hardware out and the file out
=C2=A0 =C2=A0 =C2=A0 =C2=A0 output_file<<buff;
=C2=A0 =C2=A0 });

=C2= =A0 =C2=A0 std::iafstream audio_file1(ctx,"filename1.extension");//the actual files to be use= d above
=C2=A0 =C2=A0 std::oafstream audio_fi= le2(ctx= ,"= filename2.extension");

=C2=A0 =C2=A0 //connect the files to the process
= =C2=A0 =C2=A0 //connect the hardware devi= ce to the process
=C2=A0 =C2=A0 audio_= file2<<proc<<audio_file1;//take input from file=C2=A0 =C2=A0 output_device<<proc<<= input_device;//also take from hardware
=C2=A0 =C2=A0 proc.start();
=C2=A0 =C2=A0 //do other stuff
=C2= =A0 =C2=A0 proc.stop();
}
<= br>

REQUIRED LIBRARY MEMBERS


name= space std{
=C2=A0 =C2=A0 inline namespace audio{
=C2=A0 =C2= =A0 =C2=A0 =C2=A0 //working context for a= udio flow
=C2=A0 =C2=A0 =C2=A0 =C2=A0 = template<typename>
=C2=A0 =C2=A0 =C2=A0= =C2=A0 class audio_context;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 /*
=C2=A0 =C2=A0 =C2=A0 =C2=A0 *The context in which all audio da= ta is centered.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 *Contains: sampling rate, bu= ffer size, frame size, etc...
=C2=A0 =C2=A0 =C2=A0 =C2=A0 *The values of= ain,aout,afin,afout refer to the endpoints defined by the context, when ap= plied to routing on a porocess tied to the context
=C2=A0 =C2=A0 =C2=A0 = =C2=A0 *think of a context as the program level driver object
=C2=A0 =C2= =A0 =C2=A0 =C2=A0 */

=C2=A0 =C2=A0= =C2=A0 =C2=A0 //audio streams (think lik= e std::fstream and its friends)
=C2=A0= =C2=A0 =C2=A0 =C2=A0 class astream;//audio stream
= =C2=A0 =C2=A0 =C2=A0 =C2=A0 class<= span style=3D"color:#000"> oastream;//output audio stream
=C2=A0 =C2=A0 =C2=A0 =C2=A0 = class iastream;//input audio stream
=C2=A0 =C2=A0 =C2=A0 =C2=A0 class oafstream;//output audio file = stream
=C2=A0 =C2=A0 =C2=A0 =C2=A0 class iafs= tream;/= /input audio file stream


=C2= =A0 =C2=A0 =C2=A0 =C2=A0 //stream endpoin= ts
=C2=A0 =C2=A0 =C2=A0 =C2=A0 = class ain;//audio inp= ut endpoint
=C2=A0 =C2=A0 =C2=A0 =C2= =A0 class aout;//audio output endpoint
=C2=A0 =C2=A0= =C2=A0 =C2=A0 class afin;//audio file input endpoint=C2=A0 =C2=A0 =C2=A0 =C2=A0 class afout//audio= file output endpoint

=C2=A0 =C2= =A0 =C2=A0 =C2=A0 //stream processing
=C2=A0 =C2=A0 =C2=A0 =C2=A0 template<typename= >
=C2=A0 =C2=A0 =C2=A0 =C2=A0 class astrea= m_process;//a dsp process applied to a stream
=C2=A0 =C2=A0 =C2=A0 =C2=A0 template= <typename>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 = class process_group;//a group of processes that = will act as one

=C2=A0 =C2=A0 =C2= =A0 =C2=A0 //containers
=C2=A0 =C2=A0 =C2=A0 =C2=A0 template<typename>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 class frame_buffer= ;//a sequence = container that is resizeable at runtime, but only with explicit resize call= s. contains frames(see below)
=C2=A0 = =C2=A0 =C2=A0 =C2=A0 /*Implementation not= e on frame_buffer
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*frame_buffer is int= ended to hold N number of frames which themselves can hold M number of samp= les
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*meaning that the total size in sa= mples if frame_buffer =3D N * M
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*ideal= ly frame_buffers representation of its sample data will be continuous in me= mory
=C2=A0 =C2=A0 =C2=A0 =C2=A0 */
=C2=A0 =C2=A0 =C2=A0 =C2=A0 template= <typename>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 = class frame;//a container that holds samples, th= in array wrapper


=C2=A0 =C2=A0= =C2=A0 =C2=A0 //hardware representation<= /span>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 class device;//an audio = device as recognized by the OS
=C2=A0 = =C2=A0 =C2=A0 =C2=A0 class input_device;<= span style=3D"color:#800">//an input device
=C2=A0 =C2=A0 =C2=A0 =C2=A0 class output_device;//an output device

=C2=A0 =C2=A0 =C2=A0 =C2=A0 // audio file formats
=C2= =A0 =C2=A0 =C2=A0 =C2=A0 enum class afformat{
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 raw,//raw he= aderless audio bytes, interpreted only by the settings of the context.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = //best used for temporary storage within = the life of a context
=C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 wav,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 flac= //etc...
=C2=A0 =C2=A0 =C2=A0 =C2=A0 }=
=C2=A0 =C2=A0 }
}



--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposals+unsubscribe@isocpp.org.
To post to this group, send email to std-proposals@isocpp.org.
To view this discussion on the web visit = https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/f490fd21-cf07-= 4d7b-8936-c71c97a1ab9d%40isocpp.org.

--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+unsubscribe@isocpp.org.
To post to this group, send email to std-proposals@isocpp.org.
To view this discussion on the web visit h= ttps://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CAOU91OOHbnRDM0= u2mcp-U04y85WvW7wbLr7xvR4zGBNG%3D7wfUg%40mail.gmail.com.
--001a11442370639c4a05345d6fb9-- .