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ffmpeg_next::filter::graph

Struct 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)
9fn filter(
10    spec: &str,
11    decoder: &codec::decoder::Audio,
12    encoder: &codec::encoder::Audio,
13) -> Result<filter::Graph, ffmpeg::Error> {
14    let mut filter = filter::Graph::new();
15
16    let args = format!(
17        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
18        decoder.time_base(),
19        decoder.rate(),
20        decoder.format().name(),
21        decoder.channel_layout().bits()
22    );
23
24    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
25    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
26
27    {
28        let mut out = filter.get("out").unwrap();
29
30        out.set_sample_format(encoder.format());
31        out.set_channel_layout(encoder.channel_layout());
32        out.set_sample_rate(encoder.rate());
33    }
34
35    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
36    filter.validate()?;
37
38    println!("{}", filter.dump());
39
40    if let Some(codec) = encoder.codec()
41        && !codec
42            .capabilities()
43            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
44    {
45        filter
46            .get("out")
47            .unwrap()
48            .sink()
49            .set_frame_size(encoder.frame_size());
50    }
51
52    Ok(filter)
53}
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pub fn validate(&mut self) -> Result<(), Error>

Examples found in repository?
examples/transcode-audio.rs (line 36)
9fn filter(
10    spec: &str,
11    decoder: &codec::decoder::Audio,
12    encoder: &codec::encoder::Audio,
13) -> Result<filter::Graph, ffmpeg::Error> {
14    let mut filter = filter::Graph::new();
15
16    let args = format!(
17        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
18        decoder.time_base(),
19        decoder.rate(),
20        decoder.format().name(),
21        decoder.channel_layout().bits()
22    );
23
24    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
25    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
26
27    {
28        let mut out = filter.get("out").unwrap();
29
30        out.set_sample_format(encoder.format());
31        out.set_channel_layout(encoder.channel_layout());
32        out.set_sample_rate(encoder.rate());
33    }
34
35    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
36    filter.validate()?;
37
38    println!("{}", filter.dump());
39
40    if let Some(codec) = encoder.codec()
41        && !codec
42            .capabilities()
43            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
44    {
45        filter
46            .get("out")
47            .unwrap()
48            .sink()
49            .set_frame_size(encoder.frame_size());
50    }
51
52    Ok(filter)
53}
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pub fn add( &mut self, filter: &Filter, name: &str, args: &str, ) -> Result<Context, Error>

Examples found in repository?
examples/transcode-audio.rs (line 24)
9fn filter(
10    spec: &str,
11    decoder: &codec::decoder::Audio,
12    encoder: &codec::encoder::Audio,
13) -> Result<filter::Graph, ffmpeg::Error> {
14    let mut filter = filter::Graph::new();
15
16    let args = format!(
17        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
18        decoder.time_base(),
19        decoder.rate(),
20        decoder.format().name(),
21        decoder.channel_layout().bits()
22    );
23
24    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
25    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
26
27    {
28        let mut out = filter.get("out").unwrap();
29
30        out.set_sample_format(encoder.format());
31        out.set_channel_layout(encoder.channel_layout());
32        out.set_sample_rate(encoder.rate());
33    }
34
35    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
36    filter.validate()?;
37
38    println!("{}", filter.dump());
39
40    if let Some(codec) = encoder.codec()
41        && !codec
42            .capabilities()
43            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
44    {
45        filter
46            .get("out")
47            .unwrap()
48            .sink()
49            .set_frame_size(encoder.frame_size());
50    }
51
52    Ok(filter)
53}
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pub fn get(&mut self, name: &str) -> Option<Context>

Examples found in repository?
examples/transcode-audio.rs (line 28)
9fn filter(
10    spec: &str,
11    decoder: &codec::decoder::Audio,
12    encoder: &codec::encoder::Audio,
13) -> Result<filter::Graph, ffmpeg::Error> {
14    let mut filter = filter::Graph::new();
15
16    let args = format!(
17        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
18        decoder.time_base(),
19        decoder.rate(),
20        decoder.format().name(),
21        decoder.channel_layout().bits()
22    );
23
24    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
25    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
26
27    {
28        let mut out = filter.get("out").unwrap();
29
30        out.set_sample_format(encoder.format());
31        out.set_channel_layout(encoder.channel_layout());
32        out.set_sample_rate(encoder.rate());
33    }
34
35    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
36    filter.validate()?;
37
38    println!("{}", filter.dump());
39
40    if let Some(codec) = encoder.codec()
41        && !codec
42            .capabilities()
43            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
44    {
45        filter
46            .get("out")
47            .unwrap()
48            .sink()
49            .set_frame_size(encoder.frame_size());
50    }
51
52    Ok(filter)
53}
54
55struct Transcoder {
56    stream: usize,
57    filter: filter::Graph,
58    decoder: codec::decoder::Audio,
59    encoder: codec::encoder::Audio,
60    in_time_base: ffmpeg::Rational,
61    out_time_base: ffmpeg::Rational,
62}
63
64fn transcoder<P: AsRef<Path> + ?Sized>(
65    ictx: &mut format::context::Input,
66    octx: &mut format::context::Output,
67    path: &P,
68    filter_spec: &str,
69) -> Result<Transcoder, ffmpeg::Error> {
70    let input = ictx
71        .streams()
72        .best(media::Type::Audio)
73        .expect("could not find best audio stream");
74    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
75    let mut decoder = context.decoder().audio()?;
76    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
77        .expect("failed to find encoder")
78        .audio()?;
79    let global = octx
80        .format()
81        .flags()
82        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);
83
84    decoder.set_parameters(input.parameters())?;
85
86    let mut output = octx.add_stream(codec)?;
87    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
88    let mut encoder = context.encoder().audio()?;
89
90    let channel_layout = codec
91        .channel_layouts()
92        .map(|cls| cls.best(decoder.channel_layout().channels()))
93        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);
94
95    if global {
96        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
97    }
98
99    encoder.set_rate(decoder.rate() as i32);
100    encoder.set_channel_layout(channel_layout);
101    #[cfg(not(feature = "ffmpeg_7_0"))]
102    {
103        encoder.set_channels(channel_layout.channels());
104    }
105    encoder.set_format(
106        codec
107            .formats()
108            .expect("unknown supported formats")
109            .next()
110            .unwrap(),
111    );
112    encoder.set_bit_rate(decoder.bit_rate());
113    encoder.set_max_bit_rate(decoder.max_bit_rate());
114
115    encoder.set_time_base((1, decoder.rate() as i32));
116    output.set_time_base((1, decoder.rate() as i32));
117
118    let encoder = encoder.open_as(codec)?;
119    output.set_parameters(&encoder);
120
121    let filter = filter(filter_spec, &decoder, &encoder)?;
122
123    let in_time_base = decoder.time_base();
124    let out_time_base = output.time_base();
125
126    Ok(Transcoder {
127        stream: input.index(),
128        filter,
129        decoder,
130        encoder,
131        in_time_base,
132        out_time_base,
133    })
134}
135
136impl Transcoder {
137    fn send_frame_to_encoder(&mut self, frame: &ffmpeg::Frame) {
138        self.encoder.send_frame(frame).unwrap();
139    }
140
141    fn send_eof_to_encoder(&mut self) {
142        self.encoder.send_eof().unwrap();
143    }
144
145    fn receive_and_process_encoded_packets(&mut self, octx: &mut format::context::Output) {
146        let mut encoded = ffmpeg::Packet::empty();
147        while self.encoder.receive_packet(&mut encoded).is_ok() {
148            encoded.set_stream(0);
149            encoded.rescale_ts(self.in_time_base, self.out_time_base);
150            encoded.write_interleaved(octx).unwrap();
151        }
152    }
153
154    fn add_frame_to_filter(&mut self, frame: &ffmpeg::Frame) {
155        self.filter.get("in").unwrap().source().add(frame).unwrap();
156    }
157
158    fn flush_filter(&mut self) {
159        self.filter.get("in").unwrap().source().flush().unwrap();
160    }
161
162    fn get_and_process_filtered_frames(&mut self, octx: &mut format::context::Output) {
163        let mut filtered = frame::Audio::empty();
164        while self
165            .filter
166            .get("out")
167            .unwrap()
168            .sink()
169            .frame(&mut filtered)
170            .is_ok()
171        {
172            self.send_frame_to_encoder(&filtered);
173            self.receive_and_process_encoded_packets(octx);
174        }
175    }
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pub fn dump(&self) -> String

Examples found in repository?
examples/transcode-audio.rs (line 38)
9fn filter(
10    spec: &str,
11    decoder: &codec::decoder::Audio,
12    encoder: &codec::encoder::Audio,
13) -> Result<filter::Graph, ffmpeg::Error> {
14    let mut filter = filter::Graph::new();
15
16    let args = format!(
17        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
18        decoder.time_base(),
19        decoder.rate(),
20        decoder.format().name(),
21        decoder.channel_layout().bits()
22    );
23
24    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
25    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
26
27    {
28        let mut out = filter.get("out").unwrap();
29
30        out.set_sample_format(encoder.format());
31        out.set_channel_layout(encoder.channel_layout());
32        out.set_sample_rate(encoder.rate());
33    }
34
35    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
36    filter.validate()?;
37
38    println!("{}", filter.dump());
39
40    if let Some(codec) = encoder.codec()
41        && !codec
42            .capabilities()
43            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
44    {
45        filter
46            .get("out")
47            .unwrap()
48            .sink()
49            .set_frame_size(encoder.frame_size());
50    }
51
52    Ok(filter)
53}
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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)
9fn filter(
10    spec: &str,
11    decoder: &codec::decoder::Audio,
12    encoder: &codec::encoder::Audio,
13) -> Result<filter::Graph, ffmpeg::Error> {
14    let mut filter = filter::Graph::new();
15
16    let args = format!(
17        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
18        decoder.time_base(),
19        decoder.rate(),
20        decoder.format().name(),
21        decoder.channel_layout().bits()
22    );
23
24    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
25    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
26
27    {
28        let mut out = filter.get("out").unwrap();
29
30        out.set_sample_format(encoder.format());
31        out.set_channel_layout(encoder.channel_layout());
32        out.set_sample_rate(encoder.rate());
33    }
34
35    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
36    filter.validate()?;
37
38    println!("{}", filter.dump());
39
40    if let Some(codec) = encoder.codec()
41        && !codec
42            .capabilities()
43            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
44    {
45        filter
46            .get("out")
47            .unwrap()
48            .sink()
49            .set_frame_size(encoder.frame_size());
50    }
51
52    Ok(filter)
53}
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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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fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)
Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned. 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 T
where 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 T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where 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 T
where 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 T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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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 T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.