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Today's Topics:
1. Re: Libraries for Playing Audio (Atrudyjane)
2. How to "cast" FromJSON instance value (Baa)
3. Re: Libraries for Playing Audio (Oliver Charles)
4. Re: How to "cast" FromJSON instance value (Jan von Löwenstein)
5. Re: How to "cast" FromJSON instance value (Baa)
----------------------------------------------------------------------
Message: 1
Date: Mon, 31 Jul 2017 22:42:17 -0400
From: Atrudyjane <[email protected]>
To: "[email protected]" <[email protected]>
Cc: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Libraries for Playing Audio
Message-ID:
<9-OGhbO026pu9EbidNe8YkghqLbGz8CgLpKBj4PhoQS-MmwbETPtK1xtCBwjNsvD7tpFWIVTgMBQfyEjd2M8NcHHoIhVFwx8QcTgfx_reTo=@protonmail.com>
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Thanks Alexei,
Think I've narrowed it down to either sox or conduit-audio. Looks like
SDL-mixer hasn't been updated in a while and it has an 'All reported builds
failed' status as of 2015.
Regards,
Andrea
Sent with [ProtonMail](https://protonmail.com) Secure Email.
> -------- Original Message --------
> Subject: Re: [Haskell-beginners] Libraries for Playing Audio
> Local Time: July 31, 2017 12:50 AM
> UTC Time: July 31, 2017 5:50 AM
> From: [email protected]
> To: Atrudyjane <[email protected]>, The Haskell-Beginners Mailing
> List - Discussion of primarily beginner-level topics related to Haskell
> <[email protected]>
> There is haskell wrapper for powerful sox availiable also.
> http://hackage.haskell.org/package/sox
> Alexei
>> On 31 July 2017 at 07:09 Atrudyjane <[email protected]> wrote:
>>
>>
>> Hello Cafe,
>> Is there a recommended Haskell library for playing/manipulating audio files?
>> There"s a long list of sound libraries on Hackage, and was thinking looking
>> into either conduit-audio or SDL-mixer.
>> Thank You,
>> Andrea
>>
>> Sent with [ProtonMail](https://protonmail.com) Secure
>> Email._______________________________________________
>> Beginners mailing list
>> [email protected]
>> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
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Message: 2
Date: Tue, 1 Aug 2017 11:31:40 +0300
From: Baa <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: [Haskell-beginners] How to "cast" FromJSON instance value
Message-ID: <20170801113140.250323e5@Pavel>
Content-Type: text/plain; charset=US-ASCII
Hello, List!
I have, for example, function with signature like
fn :: FromJSON a => Map Text a -> BlahBlah
and I want to treat this `a` as String (or `Text`), to read it with
`readMaybe`. Am I right that it's impossible? I get error about "...a
is rigid type and could not be matched with Text...". But `Text` is
`FromJSON` instance. Is it possible to do it (cast, convert, unwrap, etc)?
The problem's source is that early I worked with `Text` values only
(getting from HTML form) but now they become any type: int's, bool's,
etc).
===
Best regards,
Paul
------------------------------
Message: 3
Date: Tue, 01 Aug 2017 09:01:22 +0000
From: Oliver Charles <[email protected]>
To: Atrudyjane <[email protected]>, The Haskell-Beginners
Mailing List - Discussion of primarily beginner-level topics related
to Haskell <[email protected]>, "[email protected]"
<[email protected]>
Subject: Re: [Haskell-beginners] Libraries for Playing Audio
Message-ID:
<CAGRp5R=swlr-th+8mvk8kpmcuyhdqvqfhm6ysrvjgafvtdh...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
What are your requirements? SDL2's audio module is functional, but I don't
know if it's sufficient for what you're looking for.
On Tue, Aug 1, 2017 at 3:44 AM Atrudyjane <[email protected]> wrote:
> Thanks Alexei,
>
> Think I've narrowed it down to either sox or conduit-audio. Looks like
> SDL-mixer hasn't been updated in a while and it has an 'All reported builds
> failed' status as of 2015.
>
> Regards,
> Andrea
>
>
> Sent with ProtonMail <https://protonmail.com> Secure Email.
>
> -------- Original Message --------
> Subject: Re: [Haskell-beginners] Libraries for Playing Audio
> Local Time: July 31, 2017 12:50 AM
> UTC Time: July 31, 2017 5:50 AM
> From: [email protected]
> To: Atrudyjane <[email protected]>, The Haskell-Beginners Mailing
> List - Discussion of primarily beginner-level topics related to Haskell <
> [email protected]>
>
> There is haskell wrapper for powerful sox availiable also.
> http://hackage.haskell.org/package/sox
>
> Alexei
>
> > On 31 July 2017 at 07:09 Atrudyjane <[email protected]> wrote:
> >
> >
> > Hello Cafe,
> > Is there a recommended Haskell library for playing/manipulating audio
> files? There"s a long list of sound libraries on Hackage, and was thinking
> looking into either conduit-audio or SDL-mixer.
> > Thank You,
> > Andrea
> >
> > Sent with [ProtonMail](https://protonmail.com) Secure
> Email._______________________________________________
> > Beginners mailing list
> > [email protected]
> > http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
>
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
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------------------------------
Message: 4
Date: Tue, 01 Aug 2017 10:45:19 +0000
From: Jan von Löwenstein <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] How to "cast" FromJSON instance value
Message-ID:
<CAJtP4w5qsgydxAhB4K6RQX65+kmJAOyg_V+E=GNii=esfoe...@mail.gmail.com>
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Hi,
You don't know anything about your a's but that they have FromJSON
instances. That in turn means you can get values from aeson parsing
functions. Think parseJSON :: Value -> Parser a
Could you be more specific about the problem you try to solve?
Best
Jan
Baa <[email protected]> schrieb am Di., 1. Aug. 2017, 10:32:
> Hello, List!
>
> I have, for example, function with signature like
>
> fn :: FromJSON a => Map Text a -> BlahBlah
>
> and I want to treat this `a` as String (or `Text`), to read it with
> `readMaybe`. Am I right that it's impossible? I get error about "...a
> is rigid type and could not be matched with Text...". But `Text` is
> `FromJSON` instance. Is it possible to do it (cast, convert, unwrap, etc)?
>
> The problem's source is that early I worked with `Text` values only
> (getting from HTML form) but now they become any type: int's, bool's,
> etc).
>
> ===
> Best regards,
> Paul
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
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------------------------------
Message: 5
Date: Tue, 1 Aug 2017 14:01:17 +0300
From: Baa <[email protected]>
To: [email protected]
Subject: Re: [Haskell-beginners] How to "cast" FromJSON instance value
Message-ID: <20170801140117.33db8801@Pavel>
Content-Type: text/plain; charset=US-ASCII
Hello, Jan! I "remove" the question :)
Problem was: reading of HTML form values, which can be any type and
saving them in a map. I done it w/ `Map Text Value` (instead of previous
`Map Text Text`). To get values from the map, I implemented class and
several instances which returns values of different types, something
like:
class GetValue a where
getValue :: Text -> Map Text Value -> a
(promoting of `a` anywhere in the existing code needs big refactoring,
so map's value is `::Value` but not `::a`). Cons is a need to implement
N instances of `GetValue`: one per getting type.
Anywhere, Jan, thanks for quick answer, I'm sorry for this stupid
question.
> Hi,
>
> You don't know anything about your a's but that they have FromJSON
> instances. That in turn means you can get values from aeson parsing
> functions. Think parseJSON :: Value -> Parser a
> Could you be more specific about the problem you try to solve?
>
> Best
> Jan
>
> Baa <[email protected]> schrieb am Di., 1. Aug. 2017, 10:32:
>
> > Hello, List!
> >
> > I have, for example, function with signature like
> >
> > fn :: FromJSON a => Map Text a -> BlahBlah
> >
> > and I want to treat this `a` as String (or `Text`), to read it with
> > `readMaybe`. Am I right that it's impossible? I get error about
> > "...a is rigid type and could not be matched with Text...". But
> > `Text` is `FromJSON` instance. Is it possible to do it (cast,
> > convert, unwrap, etc)?
> >
> > The problem's source is that early I worked with `Text` values only
> > (getting from HTML form) but now they become any type: int's,
> > bool's, etc).
> >
> > ===
> > Best regards,
> > Paul
> > _______________________________________________
> > Beginners mailing list
> > [email protected]
> > http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
> >
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