Struct ffmpeg_next::filter::graph::Graph

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pub struct Graph { /* private fields */ }

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impl Graph

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pub unsafe fn wrap(ptr: *mut AVFilterGraph) -> Self

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pub unsafe fn as_ptr(&self) -> *const AVFilterGraph

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pub unsafe fn as_mut_ptr(&mut self) -> *mut AVFilterGraph

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impl Graph

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pub fn new() -> Self

Examples found in repository?
examples/transcode-audio.rs (line 14)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}
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pub fn validate(&mut self) -> Result<(), Error>

Examples found in repository?
examples/transcode-audio.rs (line 36)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}
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pub fn add<'a, 'b>( &'a mut self, filter: &Filter, name: &str, args: &str ) -> Result<Context<'b>, Error>where 'a: 'b,

Examples found in repository?
examples/transcode-audio.rs (line 24)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}
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pub fn get<'a, 'b>(&'b mut self, name: &str) -> Option<Context<'b>>where 'a: 'b,

Examples found in repository?
examples/transcode-audio.rs (line 28)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}

struct Transcoder {
    stream: usize,
    filter: filter::Graph,
    decoder: codec::decoder::Audio,
    encoder: codec::encoder::Audio,
    in_time_base: ffmpeg::Rational,
    out_time_base: ffmpeg::Rational,
}

fn transcoder<P: AsRef<Path>>(
    ictx: &mut format::context::Input,
    octx: &mut format::context::Output,
    path: &P,
    filter_spec: &str,
) -> Result<Transcoder, ffmpeg::Error> {
    let input = ictx
        .streams()
        .best(media::Type::Audio)
        .expect("could not find best audio stream");
    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
    let mut decoder = context.decoder().audio()?;
    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
        .expect("failed to find encoder")
        .audio()?;
    let global = octx
        .format()
        .flags()
        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);

    decoder.set_parameters(input.parameters())?;

    let mut output = octx.add_stream(codec)?;
    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
    let mut encoder = context.encoder().audio()?;

    let channel_layout = codec
        .channel_layouts()
        .map(|cls| cls.best(decoder.channel_layout().channels()))
        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);

    if global {
        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
    }

    encoder.set_rate(decoder.rate() as i32);
    encoder.set_channel_layout(channel_layout);
    encoder.set_channels(channel_layout.channels());
    encoder.set_format(
        codec
            .formats()
            .expect("unknown supported formats")
            .next()
            .unwrap(),
    );
    encoder.set_bit_rate(decoder.bit_rate());
    encoder.set_max_bit_rate(decoder.max_bit_rate());

    encoder.set_time_base((1, decoder.rate() as i32));
    output.set_time_base((1, decoder.rate() as i32));

    let encoder = encoder.open_as(codec)?;
    output.set_parameters(&encoder);

    let filter = filter(filter_spec, &decoder, &encoder)?;

    let in_time_base = decoder.time_base();
    let out_time_base = output.time_base();

    Ok(Transcoder {
        stream: input.index(),
        filter,
        decoder,
        encoder,
        in_time_base,
        out_time_base,
    })
}

impl Transcoder {
    fn send_frame_to_encoder(&mut self, frame: &ffmpeg::Frame) {
        self.encoder.send_frame(frame).unwrap();
    }

    fn send_eof_to_encoder(&mut self) {
        self.encoder.send_eof().unwrap();
    }

    fn receive_and_process_encoded_packets(&mut self, octx: &mut format::context::Output) {
        let mut encoded = ffmpeg::Packet::empty();
        while self.encoder.receive_packet(&mut encoded).is_ok() {
            encoded.set_stream(0);
            encoded.rescale_ts(self.in_time_base, self.out_time_base);
            encoded.write_interleaved(octx).unwrap();
        }
    }

    fn add_frame_to_filter(&mut self, frame: &ffmpeg::Frame) {
        self.filter.get("in").unwrap().source().add(frame).unwrap();
    }

    fn flush_filter(&mut self) {
        self.filter.get("in").unwrap().source().flush().unwrap();
    }

    fn get_and_process_filtered_frames(&mut self, octx: &mut format::context::Output) {
        let mut filtered = frame::Audio::empty();
        while self
            .filter
            .get("out")
            .unwrap()
            .sink()
            .frame(&mut filtered)
            .is_ok()
        {
            self.send_frame_to_encoder(&filtered);
            self.receive_and_process_encoded_packets(octx);
        }
    }
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pub fn dump(&self) -> String

Examples found in repository?
examples/transcode-audio.rs (line 38)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}
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pub fn input(&mut self, name: &str, pad: usize) -> Result<Parser<'_>, Error>

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pub fn output(&mut self, name: &str, pad: usize) -> Result<Parser<'_>, Error>

Examples found in repository?
examples/transcode-audio.rs (line 35)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}
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pub fn parse(&mut self, spec: &str) -> Result<(), Error>

Trait Implementations§

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impl Default for Graph

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl Drop for Graph

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl Send for Graph

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impl Sync for Graph

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.