220 26131 article Path: news.gmane.org!not-for-mail From: alexander.zywicki@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Any interest to adding audio support to the std library? Date: Fri, 3 Jun 2016 02:37:30 -0700 (PDT) Lines: 1317 Approved: news@gmane.org Message-ID: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_106_1145794443.1464946650460" X-Trace: ger.gmane.org 1464946770 21405 80.91.229.3 (3 Jun 2016 09:39:30 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 3 Jun 2016 09:39:30 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCS7TY6DTQOBBXE7YW5AKGQEVWY2OIQ@isocpp.org Fri Jun 03 11:39:15 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vk0-f70.google.com ([209.85.213.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1b8lXv-00088P-89 for gclcip-std-proposals@m.gmane.org; Fri, 03 Jun 2016 11:37:39 +0200 Original-Received: by mail-vk0-f70.google.com with SMTP id m81sf200167133vka.1 for ; Fri, 03 Jun 2016 02:37:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:subject:mime-version:x-original-sender :reply-to:precedence:mailing-list:list-id:x-spam-checked-in-group :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=BuuXlRnLHVScwOwFiPF8/KqhSG+Fyo4ba021YxQJ3Zs=; b=mWUDq7BHMiQdSEBCXGvSXqHsICR1mk2jInhqXGYtvHjUZ4aDF25B8TUaMv+eKWf4N+ WONxlEdZbv6B7u8GwR7f01aJ55zMRIZnPqXF5kmImp8VOsJY8wzfzcR+e1Pkm74YKfDt cDnAB81CMxxIrGhIEvhuIBjQSp+g06XSBbIbmlmGuDkGsp8J/ZdDPJsLPFKEpciDnvsk 3H5XTZizhmw5LaJxDbkHVFrHn0J37eiK8fTXJank3e4bE3EtihRwbJ1eM3fM3KRXIVmS c++fvyPs6LLaqgCAncIa7t9LMe1/3tGuj2k3JGvpMH0eVpphshPmq/RGxDbHLh6laKdd o1iw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id:subject:mime-version:x-original-sender :reply-to:precedence:mailing-list:list-id:x-spam-checked-in-group :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=BuuXlRnLHVScwOwFiPF8/KqhSG+Fyo4ba021YxQJ3Zs=; b=rSV9FHKgYxRGjX/pb/s3zo4EUYbHy1auq9kxHxcCplr0ZcVPXXAG1aM1eZoseXSX4n 1lYzIE8dEyOp9qWhwwst8atT5CkZxNBpuNGe2zlrGOyXCPT67XhPy19Q7OHe590weDlm ixoFNcVMwkiK0HKSpdclrL7SW8NTk7cCRbye43oXhz/qPLVghobsLYTeriLimSZdyVko S1n108F+BTJbCwJXyVn4KPRYebnKuiU0sGdNKubFb4crzygyxJDmDJPoC/lDAAFg07QE 2/8zPFeFk7PE3Ur74V8MhpgIzxc9DZsTyFndt7Iqs7h4yO1QyOCtXZsmcnutryvIy5sA 1Mxw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:message-id:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=BuuXlRnLHVScwOwFiPF8/KqhSG+Fyo4ba021YxQJ3Zs=; b=Kxa+NE+dAF3Q7yc9/e+o1w/hAYyohyjDGYOZr5BHagPZHpfXUd07PlsXZ68+Y0n5f7 ioFO5i1BVIEMgIh8XVJhBibM5oMYlhVlbU0KBkBCOXnvnJvfIzmVJhbKH1Z6gsnkoQ4f xjeRXa7lFcGAyIvv+QYa7kvcImNb+8SznJ+0rz4qosW5r7WbP2YHzw1FydN48auHso+R xaBARmkzKkyImgcYpZFmD4SEmOnIIMZZWTDZfhoUvdWQaw5xjCqCOUj7yNhfscdkbdjr QIsVoO3iVV7TD8A4JMOhl6SfR1MpmBYtVYARIwpvPcl3zTl9TOZERmOqhIkzfuMQF5r7 nzNA== X-Gm-Message-State: ALyK8tJp+qTbAGzuOPbhENZ9RWOHtxgulcvFTDMBkgpD3SxzbyJySbcLwZbzpMAIm9ztIQ== X-Received: by 10.31.146.19 with SMTP id u19mr1876109vkd.5.1464946653018; Fri, 03 Jun 2016 02:37:33 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.134.159 with SMTP id q31ls313077ioi.0.gmail; Fri, 03 Jun 2016 02:37:31 -0700 (PDT) X-Received: by 10.36.20.206 with SMTP id 197mr524064itg.3.1464946651866; Fri, 03 Jun 2016 02:37:31 -0700 (PDT) X-Original-Sender: alexander.zywicki@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:26131 Archived-At: ------=_Part_106_1145794443.1464946650460 Content-Type: multipart/alternative; boundary="----=_Part_107_48294388.1464946650462" ------=_Part_107_48294388.1464946650462 Content-Type: text/plain; charset=UTF-8 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< 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< 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< 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<>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<>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< 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. 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I have drafted some ideas on how I think the c++ std libra= ry could support audio functionality.

I know that audio functionali= ty is a very operating specific problem, but with the recent trend towards = implementing a file-system library and possibly a graphics library I believ= e 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 example= s.

Please keep in mind my drafts are still very rough.


CO= DE EXAMPLES

//std::audio example 1 "single process"
void example_1(){
=C2=A0 =C2=A0 double sample_rate =3D 44100;=C2=A0 =C2=A0 std::= size_t frame_size =3D2;=
=C2=A0 =C2=A0= std::size_t buffer_= size=3D128;

=C2=A0 =C2=A0 std::audio_context<= span style=3D"color: #080;" class=3D"styled-by-prettify"><float> ctx{sample_rate,buffer_size,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 dynamic allocation of a temporary buffer
=C2=A0 =C2=A0 = =C2=A0 =C2=A0 input>>buff;//stream= data into buffer for manipulation
=C2=A0 =C2=A0 =C2=A0 =C2=A0 for(auto&& frame: buff){<= br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 frame=3D0.0;//do something with audio
=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
=C2=A0 =C2=A0 =C2=A0 =C2= =A0 output= <<bu= ff;= //stream to outpu= t
=C2= =A0 =C2=A0 });//dsp = object
= =C2=A0 =C2=A0 //uses implied routing equivilent to
=C2=A0 =C2=A0 //std::aout<<proc<<std::a= in;
=C2= =A0 =C2=A0 //
=C2=A0 =C2=A0 proc.= start();
=C2=A0 = =C2=A0 //d= o other stuff
=C2=A0 =C2=A0 proc.stop= ();
}

//std::audio example 2 &= quot;process group"
void example_2(){

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

=C2=A0 =C2=A0= //version= 1: capture context via lambda
=C2=A0 =C2=A0 std::astream_process<float> proc1(ctx,[&ctx](std::iastream const& input, std::oastream& output){=C2=A0 =C2=A0 =C2=A0 =C2=A0 std::frame_buffer<float>& buff =3D ctx.= borrow_buf= fer();
=C2=A0 =C2= =A0 =C2=A0 =C2=A0 input>>buff;
= =C2=A0 =C2=A0 =C2=A0 =C2=A0 for(auto&= ;& fra= me:= 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 output<<buff;
=C2=A0 =C2=A0 });//dsp object

=C2=A0 =C2=A0 //version 2: have context passed as argumen= t
=C2= =A0 =C2=A0 std::astr= eam_process<float> proc2= (ctx,[](std::iastream const& input, std::oastream&= amp; outpu= t,<= span style=3D"color: #000;" class=3D"styled-by-prettify">std::audio_context<float> const& context){
=C2=A0 =C2=A0 =C2=A0 =C2=A0 std::frame_buffer<float>& 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&& frame: buff){
= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 frame*=3D2.0;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
=C2=A0 =C2=A0 =C2=A0 =C2=A0 output<<buff;
=C2=A0 =C2=A0 });

=C2=A0 =C2=A0 std::process_group<float> pgroup;//a group of processes that will h= appen consecutivley
=C2=A0 =C2=A0 pgroup.push(= proc1);//add to grou= p
=C2= =A0 =C2=A0 pgroup.pu= sh(= proc2);//add to group

=C2=A0 =C2=A0 //configure = stream relationships in terms of std::ain / std:aout manually
=C2=A0 =C2=A0 //std::ain/std::= aout are std::astream globals that refer to the default audio inputs and ou= tputs supplied by the context in use
=C2=A0 =C2=A0 //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
=C2=A0 =C2=A0 std::aout<<proc1<<proc2<= <std::ain;//method 1
=C2=A0 =C2=A0 //std::ain>>proc2>&= gt;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::audio example 3 "audio files"<= span style=3D"color: #000;" class=3D"styled-by-prettify">
void example_3= ()<= /code>{

=C2=A0 =C2= =A0 std::<= /span>audio_conte= xt<floa= t> ctx<= /span>;

=C2=A0 =C2= =A0 std::<= /span>astream_pro= cess<fl= oat> pr= oc(= ctx,[](std::iafstream const& input, std::oaf= stream&= ; output){
=C2=A0 =C2=A0 = =C2=A0 =C2=A0 std::f= rame_buffer<float>& = buff =3D ctx<= span style=3D"color: #660;" class=3D"styled-by-prettify">.borrow_buffer();
=C2=A0 =C2=A0 =C2=A0 =C2=A0= input>= >buff;
=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=3D0.0;
=C2=A0 =C2=A0 =C2=A0 =C2= =A0 }
=C2=A0 =C2= =A0 =C2=A0 =C2=A0 output<<buff;=C2=A0 =C2=A0 });//= dsp object=

=C2=A0 =C2=A0 std::iafstream audio_file1(ctx,"f= ilename1.extension");//an audio file handle
=C2=A0 =C2=A0 std::oafstream audio_file2(ctx,"filename2.extension");//an audio file handle

=C2=A0 =C2=A0 //routing
=C2=A0 =C2=A0 audio_file= 2<<<= /span>proc= <<audio_file1<= span style=3D"color: #660;" class=3D"styled-by-prettify">;//take input from file nad = write to file
=C2=A0 =C2=A0 //audio_file1>>proc>>audio_file2;//equivilent syntax=
=C2=A0= =C2=A0 proc.start();
=C2=A0 =C2=A0 <= /span>//do other = stuff
= =C2=A0 =C2=A0 proc.s= top();
}


//std::audio example 4 &qu= ot;combination routing"
void example_3(){

=C2=A0 =C2=A0 std::audio_context<float> ctx;
=C2=A0 =C2=A0 //manually select hardware endpoints
=C2=A0 =C2=A0 std= ::size_t device_id <= span style=3D"color: #660;" class=3D"styled-by-prettify">=3D ctx.default_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_devic= e<std::output_device>(device_id);

=C2=A0 =C2=A0 std::astream_process<float> proc(ctx,[](std::iastream const& input,<= /span>
=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::oastream<= span style=3D"color: #660;" class=3D"styled-by-prettify">& 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 std::iafstream 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& output_file){
=C2=A0 =C2=A0 =C2=A0 =C2=A0 std::frame_buffer<float>& buff =3D ctx.bo= rrow_buffer();
= =C2=A0 =C2=A0 =C2=A0 =C2=A0 (input + inp= ut_file)&g= t;>buff= ;//add streams to pe= rform sum before writing to buffer
=C2=A0 =C2=A0 =C2=A0 =C2=A0 //or you could 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_buffer<float> buff1;
=C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 std::frame_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 input_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 contents of buff to the hardware out and th= e 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 used above
=C2=A0 =C2=A0 std::oafstream audio_file2(ctx,"filename2.extension");

=C2=A0 =C2=A0 //connect th= e files to the process
=C2=A0 =C2=A0 //connect the hardware device to the process
=C2=A0 =C2=A0 aud= io_file2&l= t;<proc= <<audio_file1<= /span>;//take input from fi= le
=C2= =A0 =C2=A0 output_device<<proc<<input_device;//a= lso take from hardware
=C2=A0 =C2=A0 proc.start();
=C2=A0 =C2=A0 //do other stuff
=C2=A0 =C2=A0 proc.stop();
}



REQUIRED LIBRARY MEMBERS

namespace std<= span style=3D"color: #660;" class=3D"styled-by-prettify">{
=C2=A0 =C2=A0 inline namespace audio{
=C2=A0 =C2=A0 =C2=A0 =C2=A0 //working context for au= dio 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 data is centered.
= =C2=A0 =C2=A0 =C2=A0 =C2=A0 *Contains: sampling rate, buffer size, frame si= ze, etc...
=C2=A0 =C2=A0 =C2=A0 =C2=A0 *The values of ain,aout,afin,afou= t refer to the endpoints defined by the context, when applied 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 like std::fstream and its friends)=
=C2=A0= =C2=A0 =C2=A0 =C2=A0 class astream;//au= dio stream=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 class 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 iafstream;//i= nput audio file stream


=C2=A0 =C2=A0 =C2=A0 =C2=A0 //stream endpoints
=C2=A0 =C2=A0 =C2=A0 = =C2=A0 cla= ss ain;//audio input endpoint<= /span>
=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<= /span> astream_pr= ocess;//a dsp proces= s 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 explic= it resize calls. 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, thin array wrapper


=C2=A0 =C2=A0 =C2=A0 =C2=A0 //hardware repre= sentation<= br>=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 <= span style=3D"color: #008;" class=3D"styled-by-prettify">class input_device;//an input device
=C2=A0 =C2=A0 =C2= =A0 =C2=A0 class out= put_device= ;//an outp= ut device<= br>
=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 r= aw,= //raw headerless = 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<= /span>
=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...<= span style=3D"color: #000;" class=3D"styled-by-prettify">
=C2=A0 =C2=A0 = =C2=A0 =C2=A0 }
= =C2=A0 =C2=A0 }
<= /span>}



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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.
------=_Part_107_48294388.1464946650462-- ------=_Part_106_1145794443.1464946650460 Content-Type: text/plain; charset=US-ASCII; name=required_code.txt Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=required_code.txt X-Attachment-Id: 016a0680-963e-4a3b-88d0-072500b189b3 Content-ID: <016a0680-963e-4a3b-88d0-072500b189b3> 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... } } } ------=_Part_106_1145794443.1464946650460 Content-Type: text/plain; charset=US-ASCII; name=usage_ideas.txt Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=usage_ideas.txt X-Attachment-Id: 6a7d2a02-1a72-4e10-b0b7-e2fea8e12483 Content-ID: <6a7d2a02-1a72-4e10-b0b7-e2fea8e12483> //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< 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< 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< 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<>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<>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<