120 lines
2.6 KiB
Rust
120 lines
2.6 KiB
Rust
#[derive(Debug, thiserror::Error)]
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pub(crate) enum VideoError {
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#[error("Failed to interface with transcode process")]
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IO(#[from] std::io::Error),
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#[error("Failed to convert file")]
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Status,
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#[error("Transcode semaphore is closed")]
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Closed,
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}
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pub(crate) enum ThumbnailFormat {
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Jpeg,
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Webp,
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}
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impl ThumbnailFormat {
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fn as_codec(&self) -> &'static str {
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match self {
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ThumbnailFormat::Jpeg => "mjpeg",
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ThumbnailFormat::Webp => "webp",
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}
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}
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fn as_format(&self) -> &'static str {
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match self {
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ThumbnailFormat::Jpeg => "singlejpeg",
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ThumbnailFormat::Webp => "webp",
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}
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}
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}
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static MAX_TRANSCODES: once_cell::sync::OnceCell<tokio::sync::Semaphore> =
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once_cell::sync::OnceCell::new();
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fn semaphore() -> &'static tokio::sync::Semaphore {
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MAX_TRANSCODES
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.get_or_init(|| tokio::sync::Semaphore::new(num_cpus::get().saturating_sub(1).max(1)))
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}
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pub(crate) async fn to_mp4<P1, P2>(from: P1, to: P2) -> Result<(), VideoError>
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where
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P1: AsRef<std::path::Path>,
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P2: AsRef<std::path::Path>,
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{
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let permit = semaphore().acquire().await?;
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let mut child = tokio::process::Command::new("ffmpeg")
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.arg(&"-i")
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.arg(&from.as_ref())
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.args([
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&"-movflags",
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&"faststart",
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&"-pix_fmt",
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&"yuv420p",
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&"-vf",
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&"scale=trunc(iw/2)*2:trunc(ih/2)*2",
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&"-an",
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&"-codec",
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&"h264",
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&"-f",
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&"mp4",
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])
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.arg(&to.as_ref())
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.spawn()?;
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let status = child.wait().await?;
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drop(permit);
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if !status.success() {
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return Err(VideoError::Status);
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}
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Ok(())
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}
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pub(crate) async fn thumbnail<P1, P2>(
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from: P1,
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to: P2,
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format: ThumbnailFormat,
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) -> Result<(), VideoError>
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where
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P1: AsRef<std::path::Path>,
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P2: AsRef<std::path::Path>,
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{
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let permit = semaphore().acquire().await?;
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let mut child = tokio::process::Command::new("ffmpeg")
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.arg(&"-i")
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.arg(&from.as_ref())
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.args([
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&"-ss",
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&"00:00:01.000",
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&"-vframes",
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&"1",
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&"-codec",
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&format.as_codec(),
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&"-f",
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&format.as_format(),
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])
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.arg(&to.as_ref())
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.spawn()?;
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let status = child.wait().await?;
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drop(permit);
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if !status.success() {
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return Err(VideoError::Status);
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}
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Ok(())
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}
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impl From<tokio::sync::AcquireError> for VideoError {
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fn from(_: tokio::sync::AcquireError) -> VideoError {
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VideoError::Closed
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}
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}
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