/rust/registry/src/index.crates.io-1949cf8c6b5b557f/av-scenechange-0.14.1/src/decoder.rs

Source
use std::io::Read;

use num_rational::Rational32;
use v_frame::{
    frame::Frame,
    pixel::{ChromaSampling, Pixel},
};

#[cfg(feature = "ffmpeg")]
use crate::ffmpeg::FfmpegDecoder;
#[cfg(feature = "vapoursynth")]
use crate::vapoursynth::VapoursynthDecoder;

pub enum Decoder<R: Read> {
    Y4m(y4m::Decoder<R>),
    #[cfg(feature = "vapoursynth")]
    Vapoursynth(VapoursynthDecoder),
    #[cfg(feature = "ffmpeg")]
    Ffmpeg(FfmpegDecoder),
}

impl<R: Read> Decoder<R> {
    /// # Errors
    ///
    /// - If using a Vapoursynth script that contains an unsupported video
    ///   format.
    #[inline]
    pub fn get_video_details(&self) -> anyhow::Result<VideoDetails> {
        match self {
            Decoder::Y4m(dec) => Ok(crate::y4m::get_video_details(dec)),
            #[cfg(feature = "vapoursynth")]
            Decoder::Vapoursynth(dec) => dec.get_video_details(),
            #[cfg(feature = "ffmpeg")]
            Decoder::Ffmpeg(dec) => Ok(dec.video_details),
        }
    }

    /// # Errors
    ///
    /// - If a frame cannot be read.
    #[inline]
    pub fn read_video_frame<T: Pixel>(
        &mut self,
        video_details: &VideoDetails,
    ) -> anyhow::Result<Frame<T>> {
        match self {
            Decoder::Y4m(dec) => crate::y4m::read_video_frame::<R, T>(dec, video_details),
            #[cfg(feature = "vapoursynth")]
            Decoder::Vapoursynth(dec) => dec.read_video_frame::<T>(video_details),
            #[cfg(feature = "ffmpeg")]
            Decoder::Ffmpeg(dec) => dec.read_video_frame::<T>(),
        }
    }
}

#[derive(Debug, Clone, Copy)]
pub struct VideoDetails {
    pub width: usize,
    pub height: usize,
    pub bit_depth: usize,
    pub chroma_sampling: ChromaSampling,
    pub time_base: Rational32,
}

impl Default for VideoDetails {
    #[inline]
    fn default() -> Self {
        VideoDetails {
            width: 640,
            height: 480,
            bit_depth: 8,
            chroma_sampling: ChromaSampling::Cs420,
            time_base: Rational32::new(1, 30),
        }
    }
}

Coverage Report

Created: 2026-04-12 07:31

Line	Count	Source
1		use std::io::Read;
2
3		use num_rational::Rational32;
4		use v_frame::{
5		frame::Frame,
6		pixel::{ChromaSampling, Pixel},
7		};
8
9		#[cfg(feature = "ffmpeg")]
10		use crate::ffmpeg::FfmpegDecoder;
11		#[cfg(feature = "vapoursynth")]
12		use crate::vapoursynth::VapoursynthDecoder;
13
14		pub enum Decoder<R: Read> {
15		Y4m(y4m::Decoder<R>),
16		#[cfg(feature = "vapoursynth")]
17		Vapoursynth(VapoursynthDecoder),
18		#[cfg(feature = "ffmpeg")]
19		Ffmpeg(FfmpegDecoder),
20		}
21
22		impl<R: Read> Decoder<R> {
23		/// # Errors
24		///
25		/// - If using a Vapoursynth script that contains an unsupported video
26		/// format.
27		#[inline]
28	0	pub fn get_video_details(&self) -> anyhow::Result<VideoDetails> {
29	0	match self {
30	0	Decoder::Y4m(dec) => Ok(crate::y4m::get_video_details(dec)),
31		#[cfg(feature = "vapoursynth")]
32		Decoder::Vapoursynth(dec) => dec.get_video_details(),
33		#[cfg(feature = "ffmpeg")]
34		Decoder::Ffmpeg(dec) => Ok(dec.video_details),
35		}
36	0	}
37
38		/// # Errors
39		///
40		/// - If a frame cannot be read.
41		#[inline]
42	0	pub fn read_video_frame<T: Pixel>(
43	0	&mut self,
44	0	video_details: &VideoDetails,
45	0	) -> anyhow::Result<Frame<T>> {
46	0	match self {
47	0	Decoder::Y4m(dec) => crate::y4m::read_video_frame::<R, T>(dec, video_details),
48		#[cfg(feature = "vapoursynth")]
49		Decoder::Vapoursynth(dec) => dec.read_video_frame::<T>(video_details),
50		#[cfg(feature = "ffmpeg")]
51		Decoder::Ffmpeg(dec) => dec.read_video_frame::<T>(),
52		}
53	0	}
54		}
55
56		#[derive(Debug, Clone, Copy)]
57		pub struct VideoDetails {
58		pub width: usize,
59		pub height: usize,
60		pub bit_depth: usize,
61		pub chroma_sampling: ChromaSampling,
62		pub time_base: Rational32,
63		}
64
65		impl Default for VideoDetails {
66		#[inline]
67	0	fn default() -> Self {
68	0	VideoDetails {
69	0	width: 640,
70	0	height: 480,
71	0	bit_depth: 8,
72	0	chroma_sampling: ChromaSampling::Cs420,
73	0	time_base: Rational32::new(1, 30),
74	0	}
75	0	}
76		}