ffmpeg-the-third 5.0.0+ffmpeg-8.1

Safe FFmpeg wrapper (FFmpeg 5+ compatible fork of the ffmpeg crate)
Documentation 
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use std::ops::{Deref, DerefMut};
use std::ptr;

use crate::ffi::*;
use libc::c_int;

use super::Encoder as Super;
use crate::codec::{traits, Context};
use crate::{AsMutPtr, Error};

pub struct Subtitle(pub Super);

impl Subtitle {
    pub fn open(mut self) -> Result<Encoder, Error> {
        unsafe {
            match avcodec_open2(self.as_mut_ptr(), ptr::null(), ptr::null_mut()) {
                0 => Ok(Encoder(self)),
                e => Err(Error::from(e)),
            }
        }
    }

    pub fn open_as<T, Enc>(mut self, codec: Enc) -> Result<Encoder, Error>
    where
        Enc: traits::Encoder<T>,
    {
        unsafe {
            if let Some(codec) = codec.encoder() {
                match avcodec_open2(self.as_mut_ptr(), codec.as_ptr(), ptr::null_mut()) {
                    0 => Ok(Encoder(self)),
                    e => Err(Error::from(e)),
                }
            } else {
                Err(Error::EncoderNotFound)
            }
        }
    }

    pub fn open_as_with<T, Enc, Dict>(
        mut self,
        codec: Enc,
        mut options: Dict,
    ) -> Result<Encoder, Error>
    where
        Enc: traits::Encoder<T>,
        Dict: AsMutPtr<*mut AVDictionary>,
    {
        unsafe {
            if let Some(codec) = codec.encoder() {
                let res = avcodec_open2(self.as_mut_ptr(), codec.as_ptr(), options.as_mut_ptr());

                match res {
                    0 => Ok(Encoder(self)),
                    e => Err(Error::from(e)),
                }
            } else {
                Err(Error::EncoderNotFound)
            }
        }
    }
}

impl Deref for Subtitle {
    type Target = Super;

    fn deref(&self) -> &<Self as Deref>::Target {
        &self.0
    }
}

impl DerefMut for Subtitle {
    fn deref_mut(&mut self) -> &mut <Self as Deref>::Target {
        &mut self.0
    }
}

impl AsRef<Context> for Subtitle {
    fn as_ref(&self) -> &Context {
        self
    }
}

impl AsMut<Context> for Subtitle {
    fn as_mut(&mut self) -> &mut Context {
        &mut self.0
    }
}

pub struct Encoder(pub Subtitle);

impl Encoder {
    pub fn encode(&mut self, subtitle: &crate::Subtitle, out: &mut [u8]) -> Result<bool, Error> {
        unsafe {
            match avcodec_encode_subtitle(
                self.0.as_mut_ptr(),
                out.as_mut_ptr(),
                out.len() as c_int,
                subtitle.as_ptr(),
            ) {
                e if e < 0 => Err(Error::from(e)),
                _ => Ok(true),
            }
        }
    }
}

impl Deref for Encoder {
    type Target = Subtitle;

    fn deref(&self) -> &<Self as Deref>::Target {
        &self.0
    }
}

impl DerefMut for Encoder {
    fn deref_mut(&mut self) -> &mut <Self as Deref>::Target {
        &mut self.0
    }
}

impl AsRef<Context> for Encoder {
    fn as_ref(&self) -> &Context {
        self
    }
}

impl AsMut<Context> for Encoder {
    fn as_mut(&mut self) -> &mut Context {
        &mut self.0
    }
}