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ffprobe.rs
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ffprobe.rs
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//! ffprobe logic
use crate::command::args::PixelFormat;
use anyhow::{anyhow, Context};
use std::{fmt, fs::File, io::Read, path::Path, time::Duration};
pub struct Ffprobe {
/// Duration of video.
pub duration: Result<Duration, ProbeError>,
/// The video has audio stream(s).
pub has_audio: bool,
/// Audio number of channels (if multiple channel the highest).
pub max_audio_channels: Option<i64>,
/// Video frame rate.
pub fps: Result<f64, ProbeError>,
pub resolution: Option<(u32, u32)>,
pub is_image: bool,
pub pix_fmt: Option<String>,
}
impl Ffprobe {
pub fn pixel_format(&self) -> Option<PixelFormat> {
let pf = self.pix_fmt.as_deref()?;
PixelFormat::try_from(pf).ok()
}
pub fn nframes(&self) -> Result<u64, ProbeError> {
match (&self.fps, &self.duration) {
(Ok(fps), Ok(duration)) => {
let frames = (fps * duration.as_secs_f64()).round();
if frames.is_normal() && frames.is_sign_positive() {
Ok(frames as _)
} else {
Err(ProbeError(format!("Invalid nframes {frames}")))
}
}
(Err(e), _) | (_, Err(e)) => Err(e.clone()),
}
}
}
/// Try to ffprobe the given input.
pub fn probe(input: &Path) -> Ffprobe {
let is_image = is_image(input).unwrap_or(false);
let probe = match ffprobe::ffprobe(input) {
Ok(p) => p,
Err(err) => {
return Ffprobe {
duration: Err(ProbeError(format!("ffprobe: {err}"))),
fps: Err(ProbeError(format!("ffprobe: {err}"))),
has_audio: true,
max_audio_channels: None,
resolution: None,
is_image: false,
pix_fmt: None,
}
}
};
let fps = read_fps(&probe);
let duration = read_duration(&probe);
let has_audio = probe
.streams
.iter()
.any(|s| s.codec_type.as_deref() == Some("audio"));
let max_audio_channels = probe
.streams
.iter()
.filter(|s| s.codec_type.as_deref() == Some("audio"))
.filter_map(|a| a.channels)
.max();
let resolution = probe
.streams
.iter()
.filter(|s| s.codec_type.as_deref() == Some("video"))
.find_map(|s| {
let w = s.width.and_then(|w| u32::try_from(w).ok())?;
let h = s.height.and_then(|w| u32::try_from(w).ok())?;
Some((w, h))
});
let pix_fmt = probe
.streams
.into_iter()
.filter(|s| s.codec_type.as_deref() == Some("video"))
.find_map(|s| s.pix_fmt);
Ffprobe {
duration: duration.map_err(ProbeError::from),
fps: fps.map_err(ProbeError::from),
has_audio,
max_audio_channels,
resolution,
is_image,
pix_fmt,
}
}
fn is_image(path: &Path) -> anyhow::Result<bool> {
let file = File::open(path)?;
let mut file_header = Vec::with_capacity(8192);
file.take(8192).read_to_end(&mut file_header)?;
Ok(infer::is_image(&file_header))
}
fn read_duration(probe: &ffprobe::FfProbe) -> anyhow::Result<Duration> {
match probe.format.duration.as_deref() {
Some(duration_s) => {
let duration_f = duration_s
.parse::<f64>()
.with_context(|| format!("invalid ffprobe video duration: {duration_s:?}"))?;
Duration::try_from_secs_f64(duration_f)
.map_err(|e| anyhow!("{e}: ffprobe video duration: {duration_s:?}"))
}
None => Ok(Duration::ZERO),
}
}
fn read_fps(probe: &ffprobe::FfProbe) -> anyhow::Result<f64> {
let vstream = probe
.streams
.iter()
.find(|s| s.codec_type.as_deref() == Some("video"))
.context("no video stream found")?;
parse_frame_rate(&vstream.avg_frame_rate)
.or_else(|| parse_frame_rate(&vstream.r_frame_rate))
.context("invalid ffprobe video frame rate")
}
/// parse "x/y" or float strings.
pub fn parse_frame_rate(rate: &str) -> Option<f64> {
if let Some((x, y)) = rate.split_once('/') {
let x: f64 = x.parse().ok()?;
let y: f64 = y.parse().ok()?;
if x <= 0.0 || y <= 0.0 {
return None;
}
Some(x / y)
} else {
rate.parse()
.ok()
.filter(|f: &f64| f.is_finite() && *f > 0.0)
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ProbeError(String);
impl fmt::Display for ProbeError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl From<anyhow::Error> for ProbeError {
fn from(err: anyhow::Error) -> Self {
Self(format!("{err}"))
}
}
impl std::error::Error for ProbeError {}