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| 60b7f9e152 |
12 changed files with 827 additions and 3292 deletions
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.gitignore
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.gitignore
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@ -0,0 +1 @@
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*/plots/*
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@ -1,11 +1,8 @@
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all:
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make slide slideshow
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make slide
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slide:
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pandoc -t beamer --include-in-header=./style.tex monads.md -f markdown-implicit_figures -V colorlinks=true -V linkcolor=blue -V urlcolor=red -o monads.pdf
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slideshow:
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pandoc -t beamer --include-in-header=./style.tex monads.md -f markdown-implicit_figures -V colorlinks=true -V linkcolor=blue -V urlcolor=red -i -o monads-slideshow.pdf
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pandoc monads.md --filter pandoc-plot -f markdown-implicit_figures --pdf-engine=typst --template=template.typ -o monads.pdf
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view:
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zathura --mode=presentation monads.pdf &
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127
monads/monads.md
127
monads/monads.md
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@ -1,21 +1,23 @@
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---
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title:
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- Monads
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- Monads in Haskell
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author:
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- Sanchayan Maity
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theme:
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- default
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classoption:
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- aspectratio=169
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aspectratio:
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- 169
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fontsize:
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- 14pt
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papersize:
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- "presentation-16-9"
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---
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# Agenda
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## Agenda
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- Recap of Functors
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- Recap of Applicative
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- Monads
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# Functor[^1][^2]
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## Functor
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```haskell
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class Functor f where
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|
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@ -23,8 +25,6 @@ class Functor f where
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(<$) :: a -> f b -> f a
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```
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Functors Laws
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- Must preserve identity
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|
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```haskell
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|
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@ -37,16 +37,13 @@ fmap id = id
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fmap (f . g) == fmap f . fmap g
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```
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|
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[^1]: [Category Design Pattern](https://www.haskellforall.com/2012/08/the-category-design-pattern.html)
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[^2]: [Functor Design Pattern](https://www.haskellforall.com/2012/09/the-functor-design-pattern.html)
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## Higher order kinds
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|
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# Higher order kinds[^3]
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- For something to be a functor, it has to be a first order kind[^1].
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- For something to be a functor, it has to be a first order kind.
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[^1]: [Haskell's Kind System](https://diogocastro.com/blog/2018/10/17/haskells-kind-system-a-primer/)
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[^3]: [Haskell's Kind System](https://diogocastro.com/blog/2018/10/17/haskells-kind-system-a-primer/)
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|
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# Applicative
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## Applicative
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```haskell
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class Functor f => Applicative (f :: TYPE -> TYPE) where
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@ -63,7 +60,7 @@ class Functor f => Applicative (f :: TYPE -> TYPE) where
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fmap f x = pure f <*> x
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```
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|
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# Examples
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## Examples
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|
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```haskell
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pure (+1) <*> [1..3]
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@ -85,7 +82,7 @@ pure (+1) <*> [1..3]
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[(1,3),(1,4),(2,3),(2,4)]
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```
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|
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# Use cases[^4]
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## Use cases
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```haskell
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Person
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@ -94,7 +91,7 @@ Person
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<*> parseTelephone "telephone" o
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```
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|
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Can also be written as
|
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Can also be written as[^2]
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|
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```haskell
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liftA3 Person
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@ -102,9 +99,9 @@ liftA3 Person
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(parseInt "age" o)
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(parseTelephone "telephone" o)
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```
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[^4]: [FP Complete - Crash course to Applicative syntax](https://www.fpcomplete.com/haskell/tutorial/applicative-syntax/)
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[^2]: [FP Complete - Crash course to Applicative syntax](https://www.fpcomplete.com/haskell/tutorial/applicative-syntax/)
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|
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# Use cases[^5]
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## Use cases
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|
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```haskell
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parsePerson :: Parser Person
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|
|
@ -118,9 +115,7 @@ parsePerson = do
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pure $ Person name age
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```
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||||
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[^5]: [FP Complete - Crash course to Applicative syntax](https://www.fpcomplete.com/haskell/tutorial/applicative-syntax/)
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|
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# Use cases[^6]
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## Use cases
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|
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```haskell
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helper :: () -> Text -> () -> () -> Int -> () -> Person
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|
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@ -136,10 +131,7 @@ parsePerson = helper
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<*> endOfLine
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```
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||||
|
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[^6]: [FP Complete - Crash course to Applicative syntax](https://www.fpcomplete.com/haskell/tutorial/applicative-syntax/)
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|
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|
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# Lifting
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## Lifting
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|
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- Seeing Functor as unary lifting and Applicative as n-ary lifting
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|
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|
|
@ -153,7 +145,7 @@ liftA4 :: Applicative f => ..
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|||
|
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Where `liftA0 = pure` and `liftA1 = fmap`.
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|
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# Monoidal functors
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## Monoidal functors
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||||
|
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- Remember Monoid?
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|
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|
|
@ -177,7 +169,7 @@ instance Monoid a => Applicative ((,) a) where
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(u, f) <*> (v, x) = (u `mappend` v, f x)
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```
|
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|
||||
# Where are monoids again
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## Where are monoids again
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|
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```haskell
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fmap (+1) ("blah", 0)
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|
@ -193,17 +185,15 @@ liftA2 (,) [1, 2] [3, 4]
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|||
[(1,3),(1,4),(2,3),(2,4)]
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||||
```
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||||
# Function apply
|
||||
## Function apply
|
||||
|
||||
- Applying a function to an `effectful` argument
|
||||
|
||||
```haskell
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(<$>) :: Functor m => (a -> b) -> m a -> m b
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(<*>) :: Applicative m => m (a -> b) -> m a -> m b
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||||
(=<<) :: Monad m => (a -> m b) -> m a -> m b
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||||
```
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||||
|
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# Applicative laws
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||||
## Applicative laws
|
||||
|
||||
```haskell
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||||
-- Identity
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|
|
@ -219,23 +209,26 @@ pure f <*> pure x = pure (f x)
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u <*> pure y = pure ($ y) <*> u
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||||
```
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||||
|
||||
# Operators[^7]
|
||||
## Operators
|
||||
|
||||
- `pure` wraps up a pure value into some kind of Applicative
|
||||
- `liftA2` applies a pure function to the values inside two `Applicative` wrapped values
|
||||
- `<$>` operator version of `fmap`
|
||||
- `<*>` apply a wrapped function to a wrapped value
|
||||
- `*>`, `<*`
|
||||
- See more at[^3]
|
||||
|
||||
[^7]: [FP Complete - Crash course to Applicative syntax](https://www.fpcomplete.com/haskell/tutorial/applicative-syntax/)
|
||||
[^3]: [FP Complete - Crash course to Applicative syntax](https://www.fpcomplete.com/haskell/tutorial/applicative-syntax/)
|
||||
|
||||
# Monad, is that you?[^8]
|
||||
## Monad, is that you?
|
||||
|
||||
{width=60%}
|
||||
|
||||
[^8]: [The Unreasonable Effectiveness of Metaphor](https://argumatronic.com/posts/2018-09-02-effective-metaphor.html)
|
||||
- Unreasonable Effectiveness of Metaphor[^4]
|
||||
|
||||
# Motivation - I
|
||||
[^4]: [The Unreasonable Effectiveness of Metaphor](https://argumatronic.com/posts/2018-09-02-effective-metaphor.html)
|
||||
|
||||
## Motivation - I
|
||||
|
||||
```haskell
|
||||
safeInverse :: Float -> Maybe Float
|
||||
|
|
@ -251,7 +244,7 @@ sqrtInverse1 :: Float -> Maybe (Maybe Float)
|
|||
sqrtInverse1 x = safeInverse <$> (safeSqrt x)
|
||||
```
|
||||
|
||||
# Motivation - I
|
||||
## Motivation - I
|
||||
|
||||
```haskell
|
||||
joinMaybe :: Maybe (Maybe a) -> Maybe a
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|
|
@ -265,7 +258,7 @@ sqrtInverse2 x = joinMaybe $ safeInverse <$> (safeSqrt x)
|
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-- join :: Monad m => m (m a) -> m a
|
||||
```
|
||||
|
||||
# Motivation - II
|
||||
## Motivation - II
|
||||
|
||||
```haskell
|
||||
(>>=) :: Maybe a -> (a -> Maybe b) -> Maybe b
|
||||
|
|
@ -282,7 +275,7 @@ sqrtInverse x = (>>=) (safeSqrt x) safeInverse
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-- (>>=) :: Monad m => m a -> (a -> m b) -> m b
|
||||
```
|
||||
|
||||
# Motivation - III
|
||||
## Motivation - III
|
||||
|
||||
```haskell
|
||||
(>=>) :: (a -> Maybe b) -> (b -> Maybe c) -> (a -> Maybe c)
|
||||
|
|
@ -297,13 +290,13 @@ sqrtInverse3 = safeSqrt >=> safeInverse
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|||
-- (>=>) :: Monad m => (a -> m b) -> (b -> m c) -> (a -> m c)
|
||||
```
|
||||
|
||||
# Motivations
|
||||
## Motivations
|
||||
|
||||
- Flattening
|
||||
- Sequencing
|
||||
- Composition
|
||||
|
||||
# Monad
|
||||
## Monad
|
||||
|
||||
```haskell
|
||||
class Applicative m => Monad (m :: Type -> Type) where
|
||||
|
|
@ -315,7 +308,7 @@ import Control.Monad (join)
|
|||
join :: Monad m => m (m a) -> m a
|
||||
```
|
||||
|
||||
# `do` notation
|
||||
## Just **do**
|
||||
|
||||
```haskell
|
||||
main :: IO ()
|
||||
|
|
@ -326,7 +319,7 @@ main = do
|
|||
putStrLn greeting
|
||||
```
|
||||
|
||||
# Monad laws
|
||||
## Monad laws
|
||||
|
||||
```haskell
|
||||
-- Left identity
|
||||
|
|
@ -339,11 +332,11 @@ x >>= return == x
|
|||
m >>= (\x -> k x >>= h) == (m >>= k) >>= h
|
||||
```
|
||||
|
||||
# ???
|
||||
## ???
|
||||
|
||||
{width=60%}
|
||||
|
||||
# Monoids recap
|
||||
## Monoids recap
|
||||
|
||||
```haskell
|
||||
class Semigroup m where
|
||||
|
|
@ -357,7 +350,7 @@ class Semigroup m => Monoid m where
|
|||
mappend = (<>)
|
||||
```
|
||||
|
||||
# Some Math
|
||||
## Some Math
|
||||
|
||||
{width=30%}
|
||||
|
||||
|
|
@ -365,7 +358,7 @@ class Semigroup m => Monoid m where
|
|||
- Arrows between objects (morphisms): functions mapping one object to another
|
||||
- Two categories: **Set** and **Hask**
|
||||
|
||||
# Categories
|
||||
## Categories
|
||||
|
||||
- **Set**
|
||||
- Category of sets
|
||||
|
|
@ -376,9 +369,9 @@ class Semigroup m => Monoid m where
|
|||
- Arrows between objects `a` & `b` are functions of type `a -> b`
|
||||
- `a -> b` also a `Type` in **Hask**
|
||||
- If `A -> B` and `B -> C`, then `A -> C` ~= `.` in **Hask**
|
||||
- Fun fact: Function composition forms a monoid! (See [Endo](https://hackage.haskell.org/package/base-4.20.0.1/docs/Data-Monoid.html#t:Endo)).
|
||||
- Fun fact: Function composition forms a monoid! (See [Endo](https://hackage.haskell.org/package/base-4.20.0.1/docs/Data-Monoid.html##t:Endo)).
|
||||
|
||||
# Monads are monoids...
|
||||
## Monads are monoids...
|
||||
|
||||
In Haskell
|
||||
|
||||
|
|
@ -400,24 +393,24 @@ Type
|
|||
a -> m b
|
||||
```
|
||||
|
||||
# Now?
|
||||
## Now?
|
||||
|
||||
{width=80%}
|
||||
|
||||
# Contrasts with Monad
|
||||
## Contrasts with Monad
|
||||
|
||||
- No data dependency between `f a` and `f b`
|
||||
- Result of `f a` can't possibly influence the behaviour of `f b`
|
||||
- That needs something like `a -> f b`
|
||||
|
||||
# Applicative vs Monads
|
||||
## Applicative vs Monads
|
||||
|
||||
- Applicative
|
||||
* Effects
|
||||
* Batching and aggregation
|
||||
* Concurrency/Independent
|
||||
- Parsing context free grammar
|
||||
- Exploring all branches of computation (see [`Alternative`](https://hackage.haskell.org/package/base-4.20.0.1/docs/Control-Applicative.html#t:Alternative))
|
||||
- Exploring all branches of computation (see [`Alternative`](https://hackage.haskell.org/package/base-4.20.0.1/docs/Control-Applicative.html##t:Alternative))
|
||||
|
||||
- Monads
|
||||
* Effects
|
||||
|
|
@ -426,14 +419,14 @@ a -> m b
|
|||
- Parsing context sensitive grammar
|
||||
- Branching on previous results
|
||||
|
||||
# Weaker but better
|
||||
## Weaker but better
|
||||
|
||||
- Weaker than monads but thus also more common
|
||||
- Lends itself to optimisation (See Facebook's [Haxl](https://hackage.haskell.org/package/haxl) project)
|
||||
- Always opt for the least powerful mechanism to get things done
|
||||
- No dependency issues or branching? just use applicative
|
||||
|
||||
# State monad
|
||||
## State monad
|
||||
|
||||
```haskell
|
||||
newtype State s a = State { runState :: s -> (a, s) }
|
||||
|
|
@ -452,7 +445,7 @@ instance Applicative (State s) where
|
|||
(aTob a, s'')
|
||||
```
|
||||
|
||||
# State monad
|
||||
## State monad
|
||||
|
||||
```haskell
|
||||
instance Monad (State s) where
|
||||
|
|
@ -473,7 +466,7 @@ get :: State s s
|
|||
get = State $ \s -> (s, s)
|
||||
```
|
||||
|
||||
# State monad
|
||||
## State monad
|
||||
|
||||
```haskell
|
||||
put :: s -> State s ()
|
||||
|
|
@ -487,7 +480,7 @@ eval (State sa) x = let (a, _) = sa x
|
|||
in a
|
||||
```
|
||||
|
||||
# Context
|
||||
## Context
|
||||
|
||||
```haskell
|
||||
type Stack = [Int]
|
||||
|
|
@ -505,7 +498,7 @@ tos :: State Stack Int
|
|||
tos = State $ \(x:xs) -> (x, x:xs)
|
||||
```
|
||||
|
||||
# Context
|
||||
## Context
|
||||
|
||||
```haskell
|
||||
stackManip :: State Stack Int
|
||||
|
|
@ -520,7 +513,7 @@ stackManip = do
|
|||
testState = eval stackManip empty
|
||||
```
|
||||
|
||||
# Reader monad
|
||||
## Reader monad
|
||||
|
||||
```haskell
|
||||
class Monad m => MonadReader r m | m -> r where
|
||||
|
|
@ -528,7 +521,7 @@ class Monad m => MonadReader r m | m -> r where
|
|||
local :: (r -> r) -> m a -> m a
|
||||
```
|
||||
|
||||
# Context
|
||||
## Context
|
||||
|
||||
```haskell
|
||||
import Control.Monad.Reader
|
||||
|
|
@ -544,7 +537,7 @@ jerry = do
|
|||
return (env ++ " This is Jerry.")
|
||||
```
|
||||
|
||||
# Context
|
||||
## Context
|
||||
|
||||
```haskell
|
||||
tomAndJerry :: Reader String String
|
||||
|
|
@ -557,10 +550,8 @@ runJerryRun :: String
|
|||
runJerryRun = runReader tomAndJerry "Who is this?"
|
||||
```
|
||||
|
||||
# Questions
|
||||
## Questions
|
||||
|
||||
- Reach out on
|
||||
* Email: me@sanchayanmaity.net
|
||||
* Mastodon: [sanchayanmaity.com](https://sanchayanmaity.com/@sanchayan)
|
||||
* Telegram: [t.me/SanchayanMaity](https://t.me/SanchayanMaity)
|
||||
* Blog: [sanchayanmaity.net](https://sanchayanmaity.net/)
|
||||
|
|
|
|||
Binary file not shown.
|
|
@ -1 +0,0 @@
|
|||
\logo{\includegraphics[height=0.5cm]{../images/Haskell.jpg}\vspace{220pt}\hspace{8pt}}
|
||||
131
monads/template.typ
Normal file
131
monads/template.typ
Normal file
|
|
@ -0,0 +1,131 @@
|
|||
#import "@preview/diatypst:0.2.0": *
|
||||
#show: slides.with(
|
||||
title: "Monads in Haskell",
|
||||
authors: ("Sanchayan Maity"),
|
||||
ratio: 16/9,
|
||||
layout: "large",
|
||||
toc: false,
|
||||
footer: false,
|
||||
count: true,
|
||||
)
|
||||
|
||||
$definitions.typst()$
|
||||
|
||||
#show terms: it => {
|
||||
it.children
|
||||
.map(child => [
|
||||
#strong[#child.term]
|
||||
#block(inset: (left: 1.5em, top: -0.4em))[#child.description]
|
||||
])
|
||||
.join()
|
||||
}
|
||||
|
||||
#set table(
|
||||
inset: 6pt,
|
||||
stroke: none
|
||||
)
|
||||
|
||||
#show figure.where(
|
||||
kind: table
|
||||
): set figure.caption(position: $if(table-caption-position)$$table-caption-position$$else$top$endif$)
|
||||
|
||||
#show figure.where(
|
||||
kind: image
|
||||
): set figure.caption(position: $if(figure-caption-position)$$figure-caption-position$$else$bottom$endif$)
|
||||
|
||||
$if(template)$
|
||||
#import "$template$": conf
|
||||
$else$
|
||||
$template.typst()$
|
||||
$endif$
|
||||
|
||||
$for(header-includes)$
|
||||
$header-includes$
|
||||
|
||||
$endfor$
|
||||
#show: doc => conf(
|
||||
$if(title)$
|
||||
title: [$title$],
|
||||
$endif$
|
||||
$if(subtitle)$
|
||||
subtitle: [$subtitle$],
|
||||
$endif$
|
||||
$if(author)$
|
||||
authors: (
|
||||
$for(author)$
|
||||
$if(author.name)$
|
||||
( name: [$author.name$],
|
||||
affiliation: [$author.affiliation$],
|
||||
email: [$author.email$] ),
|
||||
$else$
|
||||
( name: [$author$],
|
||||
affiliation: "",
|
||||
email: "" ),
|
||||
$endif$
|
||||
$endfor$
|
||||
),
|
||||
$endif$
|
||||
$if(keywords)$
|
||||
keywords: ($for(keywords)$$keyword$$sep$,$endfor$),
|
||||
$endif$
|
||||
$if(date)$
|
||||
date: [$date$],
|
||||
$endif$
|
||||
$if(lang)$
|
||||
lang: "$lang$",
|
||||
$endif$
|
||||
$if(region)$
|
||||
region: "$region$",
|
||||
$endif$
|
||||
$if(abstract)$
|
||||
abstract: [$abstract$],
|
||||
$endif$
|
||||
$if(margin)$
|
||||
margin: ($for(margin/pairs)$$margin.key$: $margin.value$,$endfor$),
|
||||
$endif$
|
||||
$if(papersize)$
|
||||
paper: "$papersize$",
|
||||
$endif$
|
||||
$if(mainfont)$
|
||||
font: ("$mainfont$",),
|
||||
$endif$
|
||||
$if(fontsize)$
|
||||
fontsize: $fontsize$,
|
||||
$endif$
|
||||
$if(section-numbering)$
|
||||
sectionnumbering: "$section-numbering$",
|
||||
$endif$
|
||||
cols: $if(columns)$$columns$$else$1$endif$,
|
||||
doc,
|
||||
)
|
||||
|
||||
$for(include-before)$
|
||||
$include-before$
|
||||
|
||||
$endfor$
|
||||
$if(toc)$
|
||||
#outline(
|
||||
title: auto,
|
||||
depth: $toc-depth$
|
||||
);
|
||||
$endif$
|
||||
|
||||
$body$
|
||||
|
||||
$if(citations)$
|
||||
$if(csl)$
|
||||
|
||||
#set bibliography(style: "$csl$")
|
||||
$elseif(bibliographystyle)$
|
||||
|
||||
#set bibliography(style: "$bibliographystyle$")
|
||||
$endif$
|
||||
$if(bibliography)$
|
||||
|
||||
#bibliography($for(bibliography)$"$bibliography$"$sep$,$endfor$)
|
||||
$endif$
|
||||
$endif$
|
||||
$for(include-after)$
|
||||
|
||||
$include-after$
|
||||
$endfor$
|
||||
508
rusttechx-2024/ogg-demux-pipeline.svg
Normal file
508
rusttechx-2024/ogg-demux-pipeline.svg
Normal file
|
|
@ -0,0 +1,508 @@
|
|||
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
|
||||
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
|
||||
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
|
||||
<!-- Generated by graphviz version 12.1.2 (0)
|
||||
-->
|
||||
<!-- Title: pipeline Pages: 1 -->
|
||||
<svg width="2935pt" height="526pt"
|
||||
viewBox="0.00 0.00 2935.20 525.75" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
|
||||
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 521.75)">
|
||||
<title>pipeline</title>
|
||||
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|
||||
<text text-anchor="middle" x="1463.6" y="-504.25" font-family="sans" font-size="10.00"><GstPipeline></text>
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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<text text-anchor="middle" x="2632.82" y="-193.4" font-family="Bitstream Vera Sans" font-size="8.00">GstAutoAudioSink</text>
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|
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|
||||
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|
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|
||||
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|
||||
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|
||||
<g id="clust5" class="cluster">
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||||
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||||
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||||
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||||
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|
||||
<g id="clust8" class="cluster">
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|
||||
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||||
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|
||||
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|
||||
<g id="clust10" class="cluster">
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||||
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|
||||
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|
||||
<g id="clust11" class="cluster">
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||||
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||||
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|
||||
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|
||||
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|
||||
<g id="clust14" class="cluster">
|
||||
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||||
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|
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|
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||||
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|
||||
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|
||||
<g id="clust16" class="cluster">
|
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After Width: | Height: | Size: 46 KiB |
File diff suppressed because it is too large
Load diff
|
Before Width: | Height: | Size: 298 KiB |
Binary file not shown.
|
Before Width: | Height: | Size: 120 KiB |
Binary file not shown.
|
|
@ -48,34 +48,53 @@ gst-launch-1.0 videotestsrc ! autovideosink
|
|||
gst-launch-1.0 audiotestsrc ! autoaudiosink
|
||||
```
|
||||
|
||||
## Media pipeline[^1]
|
||||
## **gst-inspect**
|
||||
|
||||
```bash
|
||||
Factory Details:
|
||||
Rank none (0)
|
||||
Long-name Video test source
|
||||
Klass Source/Video
|
||||
Description Creates a test video stream
|
||||
Author David A. Schleef <ds@schleef.org>
|
||||
Documentation https://gstreamer.freedesktop.org/documentation/videotestsrc/#videotestsrc-page
|
||||
|
||||
Plugin Details:
|
||||
Name videotestsrc
|
||||
Description Creates a test video stream
|
||||
Filename /usr/lib/gstreamer-1.0/libgstvideotestsrc.so
|
||||
Version 1.24.9
|
||||
License LGPL
|
||||
Source module gst-plugins-base
|
||||
Documentation https://gstreamer.freedesktop.org/documentation/videotestsrc/
|
||||
Source release date 2024-10-30
|
||||
Binary package Arch Linux GStreamer 1.24.9-3
|
||||
Origin URL https://www.archlinux.org/
|
||||
|
||||
GObject
|
||||
+----GInitiallyUnowned
|
||||
+----GstObject
|
||||
+----GstElement
|
||||
+----GstBaseSrc
|
||||
+----GstPushSrc
|
||||
+----GstVideoTestSrc
|
||||
|
||||
Pad Templates:
|
||||
SRC template: 'src'
|
||||
Availability: Always
|
||||
Capabilities:
|
||||
video/x-raw
|
||||
```
|
||||
|
||||
## Media pipeline
|
||||
|
||||
{width=80%}
|
||||
|
||||
[^1]: [Dynamic Pipelines](https://gstreamer.freedesktop.org/documentation/tutorials/basic/dynamic-pipelines.html?gi-language=c)
|
||||
|
||||
## Playback pipeline
|
||||
|
||||
```bash
|
||||
gst-play-1.0 https://devstreaming-cdn.apple.com/videos/streaming/examples/img_bipbop_adv_example_ts/master.m3u8
|
||||
```
|
||||
|
||||
## Playback pipeline graph
|
||||
|
||||
|
||||
|
||||
## Custom elements
|
||||
|
||||
{width=58%}
|
||||
|
||||
```bash
|
||||
gst-launch-1.0 filesrc location=bunny.mp4 ! decodebin ! videoconvert ! roundedcorners border-radius-px=100 ! videoconvert ! gtksink
|
||||
```
|
||||
|
||||
## Why Rust?
|
||||
|
||||
- Codec implementations in pure Rust (Rust Audio, Xiph AV1, Symphonia)
|
||||
- Things we care about
|
||||
- Things to care about
|
||||
* **Low cognitive overhead**
|
||||
* Immutability
|
||||
* Expressive type system
|
||||
|
|
@ -84,7 +103,7 @@ gst-launch-1.0 filesrc location=bunny.mp4 ! decodebin ! videoconvert ! roundedco
|
|||
|
||||
## Why Rust?
|
||||
|
||||
- Bindings/abstractions over GLib/GObject and for GStreamer[^2]
|
||||
- Bindings/abstractions over GLib/GObject and for GStreamer[^1]
|
||||
- Provides a root for the object hierarchy tree filed in by the GStreamer library
|
||||
- Gives basic reference counting, parenting functionality and locking.
|
||||
- GObject
|
||||
|
|
@ -99,7 +118,7 @@ gst-launch-1.0 filesrc location=bunny.mp4 ! decodebin ! videoconvert ! roundedco
|
|||
- GstElement
|
||||
- GstPad
|
||||
|
||||
[^2]: [GstObject](https://gstreamer.freedesktop.org/documentation/gstreamer/gstobject.html?gi-language=c)
|
||||
[^1]: [GstObject](https://gstreamer.freedesktop.org/documentation/gstreamer/gstobject.html?gi-language=c)
|
||||
|
||||
## Why immutability and types matter?
|
||||
|
||||
|
|
@ -210,9 +229,86 @@ For more information about this error, try `rustc --explain E0596`.
|
|||
}
|
||||
```
|
||||
|
||||
## GStreamer & Rust
|
||||
## Code
|
||||
|
||||
- Some stats[^3]
|
||||
```rust
|
||||
let src = gst::ElementFactory::make("filesrc")
|
||||
.property("location", "sample.ogv")
|
||||
.build()
|
||||
.unwrap();
|
||||
let demux = gst::ElementFactory::make("oggdemux").build().unwrap();
|
||||
|
||||
let pipeline_weak = pipeline.downgrade();
|
||||
demux.connect("pad-added", false, move |args| {
|
||||
let pipeline = match pipeline_weak.upgrade() {
|
||||
Some(self_) => self_,
|
||||
None => return None,
|
||||
};
|
||||
|
||||
let pad = args[1]
|
||||
.get::<gst::Pad>()
|
||||
.expect("Second argument to demux pad-added must be pad");
|
||||
```
|
||||
|
||||
## Code
|
||||
|
||||
```rust
|
||||
if let Some(caps) = pad.current_caps() {
|
||||
let s = caps.structure(0).unwrap();
|
||||
|
||||
let (decoder, sink) = if s.name().starts_with("video") {
|
||||
let decoder = gst::ElementFactory::make("theoradec").build().unwrap();
|
||||
let sink = gst::ElementFactory::make("autovideosink").build().unwrap();
|
||||
(decoder, sink)
|
||||
} else {
|
||||
let decoder = gst::ElementFactory::make("vorbisdec").build().unwrap();
|
||||
let sink = gst::ElementFactory::make("autoaudiosink").build().unwrap();
|
||||
(decoder, sink)
|
||||
};
|
||||
|
||||
let queue1 = gst::ElementFactory::make("queue").build().unwrap();
|
||||
let queue2 = gst::ElementFactory::make("queue").build().unwrap();
|
||||
```
|
||||
|
||||
## Code
|
||||
|
||||
```rust
|
||||
pipeline
|
||||
.add_many([&queue1, &decoder, &queue2, &sink])
|
||||
.unwrap();
|
||||
|
||||
let sinkpad = queue1.static_pad("sink").unwrap();
|
||||
pad.link(&sinkpad).unwrap();
|
||||
|
||||
queue1.link(&decoder).unwrap();
|
||||
decoder.link(&queue2).unwrap();
|
||||
queue2.link(&sink).unwrap();
|
||||
|
||||
queue1.sync_state_with_parent().unwrap();
|
||||
decoder.sync_state_with_parent().unwrap();
|
||||
queue2.sync_state_with_parent().unwrap();
|
||||
sink.sync_state_with_parent().unwrap();
|
||||
}
|
||||
```
|
||||
|
||||
## Code
|
||||
|
||||
```rust
|
||||
None
|
||||
});
|
||||
|
||||
pipeline.add_many([&src, &demux]).unwrap();
|
||||
|
||||
src.link(&demux).unwrap();
|
||||
```
|
||||
|
||||
## Media pipeline
|
||||
|
||||
|
||||
|
||||
## Some stats
|
||||
|
||||
- **gstreamer-rs** & **gst-plugins-rs**[^2]
|
||||
- gstreamer-rs: ~2700 commits, gst-plugins-rs: ~2600 commits
|
||||
- gstreamer-rs: ~85 contributors, gst-plugins-rs: ~110 contributors
|
||||
- gst-plugins-rs: ~ +180k SLOC / -37k SLOC
|
||||
|
|
@ -221,22 +317,24 @@ For more information about this error, try `rustc --explain E0596`.
|
|||
- 1.22 cycle: ~33% commits / MRs in Rust modules
|
||||
- 1.24 cycle: ~25% commits / MRs in Rust modules
|
||||
|
||||
[^3]: [GStreamer & Rust: What has happened over the last 5 years](https://gstconf.ubicast.tv/videos/gstreamer-rust-what-has-happened-over-the-last-5-years_f8qxhpuzi9/)
|
||||
[^2]: [GStreamer & Rust: What has happened over the last 5 years](https://gstconf.ubicast.tv/videos/gstreamer-rust-what-has-happened-over-the-last-5-years_f8qxhpuzi9/)
|
||||
|
||||
## Resources
|
||||
|
||||
- [Dynamic Pipelines](https://gstreamer.freedesktop.org/documentation/tutorials/basic/dynamic-pipelines.html?gi-language=c)
|
||||
- [GObject subclassing in Rust ](https://www.youtube.com/watch?v=TSf3rVyv7c8)
|
||||
- [GStreamer bindings for Rust](https://gitlab.freedesktop.org/gstreamer/gstreamer-rs)
|
||||
- [Rust GStreamer Plugins](https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs)
|
||||
- [Using GStreamer](https://www.youtube.com/watch?v=ZphadMGufY8)
|
||||
- [How to get started with GStreamer](https://www.youtube.com/watch?v=OkOsm9FyzdM&t=2s)
|
||||
- [GStreamer for your backend services](https://asymptotic.io/blog/gstreamer-for-your-backend-services/)
|
||||
- [OGG demultiplexing Rust sample code](https://gitlab.freedesktop.org/SanchayanMaity/ogg-demux)
|
||||
|
||||
## Questions?
|
||||
|
||||
- Rust Bangalore
|
||||
* Meetup: https://hasgeek.com/rustbangalore
|
||||
* Telegram: t.me/RustIndia
|
||||
* Meetup: [https://hasgeek.com/rustbangalore](https://hasgeek.com/rustbangalore)
|
||||
* Telegram: [https://t.me/RustIndia](https://t.me/RustIndia)
|
||||
- Reach out on
|
||||
* email:
|
||||
|
||||
|
|
|
|||
|
|
@ -1,7 +1,6 @@
|
|||
#import "@preview/diatypst:0.2.0": *
|
||||
#show: slides.with(
|
||||
title: "Multimedia using Rust & GStreamer",
|
||||
authors: ("Sanchayan Maity"),
|
||||
ratio: 16/9,
|
||||
layout: "large",
|
||||
toc: false,
|
||||
|
|
|
|||
Loading…
Reference in a new issue