playa-ffmpeg 8.0.3

Safe FFmpeg wrapper with vcpkg integration for simplified cross-platform builds (FFmpeg 8.0, Rust 2024)
Documentation 
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use std::ops::Deref;

use super::codec::Codec;
use crate::{ChannelLayout, ffi::*, format};

#[derive(PartialEq, Eq, Copy, Clone)]
pub struct Audio {
    codec: Codec,
}

impl Audio {
    pub unsafe fn new(codec: Codec) -> Audio {
        Audio { codec }
    }
}

impl Audio {
    pub fn rates(&self) -> Option<RateIter> {
        unsafe { if (*self.as_ptr()).supported_samplerates.is_null() { None } else { Some(RateIter::new((*self.codec.as_ptr()).supported_samplerates)) } }
    }

    pub fn formats(&self) -> Option<FormatIter> {
        unsafe { if (*self.codec.as_ptr()).sample_fmts.is_null() { None } else { Some(FormatIter::new((*self.codec.as_ptr()).sample_fmts)) } }
    }

    pub fn channel_layouts(&self) -> Option<ChannelLayoutIter> {
        unsafe {
            #[cfg(not(feature = "ffmpeg_7_0"))]
            let ptr = (*self.codec.as_ptr()).channel_layouts;

            #[cfg(feature = "ffmpeg_7_0")]
            let ptr = (*self.codec.as_ptr()).ch_layouts;

            if ptr.is_null() { None } else { Some(ChannelLayoutIter::new(ptr)) }
        }
    }
}

impl Deref for Audio {
    type Target = Codec;

    fn deref(&self) -> &Self::Target {
        &self.codec
    }
}

pub struct RateIter {
    ptr: *const i32,
}

impl RateIter {
    pub fn new(ptr: *const i32) -> Self {
        RateIter { ptr }
    }
}

impl Iterator for RateIter {
    type Item = i32;

    fn next(&mut self) -> Option<<Self as Iterator>::Item> {
        unsafe {
            if *self.ptr == 0 {
                return None;
            }

            let rate = *self.ptr;
            self.ptr = self.ptr.offset(1);

            Some(rate)
        }
    }
}

pub struct FormatIter {
    ptr: *const AVSampleFormat,
}

impl FormatIter {
    pub fn new(ptr: *const AVSampleFormat) -> Self {
        FormatIter { ptr }
    }
}

impl Iterator for FormatIter {
    type Item = format::Sample;

    fn next(&mut self) -> Option<<Self as Iterator>::Item> {
        unsafe {
            if *self.ptr == AVSampleFormat::AV_SAMPLE_FMT_NONE {
                return None;
            }

            let format = (*self.ptr).into();
            self.ptr = self.ptr.offset(1);

            Some(format)
        }
    }
}

#[cfg(not(feature = "ffmpeg_7_0"))]
type ChannelLayoutType = u64;
#[cfg(feature = "ffmpeg_7_0")]
type ChannelLayoutType = AVChannelLayout;

pub struct ChannelLayoutIter {
    ptr: *const ChannelLayoutType,
}

impl ChannelLayoutIter {
    pub fn new(ptr: *const ChannelLayoutType) -> Self {
        ChannelLayoutIter { ptr }
    }

    pub fn best(self, max: i32) -> ChannelLayout {
        self.fold(ChannelLayout::MONO, |acc, cur| if cur.channels() > acc.channels() && cur.channels() <= max as _ { cur } else { acc })
    }
}

impl Iterator for ChannelLayoutIter {
    type Item = ChannelLayout;

    fn next(&mut self) -> Option<<Self as Iterator>::Item> {
        unsafe {
            #[cfg(not(feature = "ffmpeg_7_0"))]
            if *self.ptr == 0 {
                return None;
            }

            #[cfg(feature = "ffmpeg_7_0")]
            if self.ptr.is_null() || (*self.ptr).u.mask == 0 {
                return None;
            }

            #[cfg(not(feature = "ffmpeg_7_0"))]
            let layout = ChannelLayout::from_bits_truncate(*self.ptr);

            #[cfg(feature = "ffmpeg_7_0")]
            let layout = ChannelLayout::from(*self.ptr);

            self.ptr = self.ptr.offset(1);

            Some(layout)
        }
    }
}