ffmpeg_rs::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 13)
8fn filter(
9    spec: &str,
10    decoder: &codec::decoder::Audio,
11    encoder: &codec::encoder::Audio,
12) -> Result<filter::Graph, ffmpeg_rs::Error> {
13    let mut filter = filter::Graph::new();
14
15    let args = format!(
16        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
17        decoder.time_base(),
18        decoder.rate(),
19        decoder.format().name(),
20        decoder.channel_layout().bits()
21    );
22
23    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
24    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
25
26    {
27        let mut out = filter.get("out").unwrap();
28
29        out.set_sample_format(encoder.format());
30        out.set_channel_layout(encoder.channel_layout());
31        out.set_sample_rate(encoder.rate());
32    }
33
34    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
35    filter.validate()?;
36
37    println!("{}", filter.dump());
38
39    if let Some(codec) = encoder.codec() {
40        if !codec
41            .capabilities()
42            .contains(ffmpeg_rs::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
43        {
44            filter
45                .get("out")
46                .unwrap()
47                .sink()
48                .set_frame_size(encoder.frame_size());
49        }
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 35)
8fn filter(
9    spec: &str,
10    decoder: &codec::decoder::Audio,
11    encoder: &codec::encoder::Audio,
12) -> Result<filter::Graph, ffmpeg_rs::Error> {
13    let mut filter = filter::Graph::new();
14
15    let args = format!(
16        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
17        decoder.time_base(),
18        decoder.rate(),
19        decoder.format().name(),
20        decoder.channel_layout().bits()
21    );
22
23    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
24    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
25
26    {
27        let mut out = filter.get("out").unwrap();
28
29        out.set_sample_format(encoder.format());
30        out.set_channel_layout(encoder.channel_layout());
31        out.set_sample_rate(encoder.rate());
32    }
33
34    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
35    filter.validate()?;
36
37    println!("{}", filter.dump());
38
39    if let Some(codec) = encoder.codec() {
40        if !codec
41            .capabilities()
42            .contains(ffmpeg_rs::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
43        {
44            filter
45                .get("out")
46                .unwrap()
47                .sink()
48                .set_frame_size(encoder.frame_size());
49        }
50    }
51
52    Ok(filter)
53}
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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 23)
8fn filter(
9    spec: &str,
10    decoder: &codec::decoder::Audio,
11    encoder: &codec::encoder::Audio,
12) -> Result<filter::Graph, ffmpeg_rs::Error> {
13    let mut filter = filter::Graph::new();
14
15    let args = format!(
16        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
17        decoder.time_base(),
18        decoder.rate(),
19        decoder.format().name(),
20        decoder.channel_layout().bits()
21    );
22
23    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
24    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
25
26    {
27        let mut out = filter.get("out").unwrap();
28
29        out.set_sample_format(encoder.format());
30        out.set_channel_layout(encoder.channel_layout());
31        out.set_sample_rate(encoder.rate());
32    }
33
34    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
35    filter.validate()?;
36
37    println!("{}", filter.dump());
38
39    if let Some(codec) = encoder.codec() {
40        if !codec
41            .capabilities()
42            .contains(ffmpeg_rs::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
43        {
44            filter
45                .get("out")
46                .unwrap()
47                .sink()
48                .set_frame_size(encoder.frame_size());
49        }
50    }
51
52    Ok(filter)
53}
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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 27)
8fn filter(
9    spec: &str,
10    decoder: &codec::decoder::Audio,
11    encoder: &codec::encoder::Audio,
12) -> Result<filter::Graph, ffmpeg_rs::Error> {
13    let mut filter = filter::Graph::new();
14
15    let args = format!(
16        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
17        decoder.time_base(),
18        decoder.rate(),
19        decoder.format().name(),
20        decoder.channel_layout().bits()
21    );
22
23    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
24    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
25
26    {
27        let mut out = filter.get("out").unwrap();
28
29        out.set_sample_format(encoder.format());
30        out.set_channel_layout(encoder.channel_layout());
31        out.set_sample_rate(encoder.rate());
32    }
33
34    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
35    filter.validate()?;
36
37    println!("{}", filter.dump());
38
39    if let Some(codec) = encoder.codec() {
40        if !codec
41            .capabilities()
42            .contains(ffmpeg_rs::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
43        {
44            filter
45                .get("out")
46                .unwrap()
47                .sink()
48                .set_frame_size(encoder.frame_size());
49        }
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_rs::Rational,
61    out_time_base: ffmpeg_rs::Rational,
62}
63
64fn transcoder<P: AsRef<Path>>(
65    ictx: &mut format::context::Input,
66    octx: &mut format::context::Output,
67    path: &P,
68    filter_spec: &str,
69) -> Result<Transcoder, ffmpeg_rs::Error> {
70    let input = ictx
71        .streams()
72        .best(media::Type::Audio)
73        .expect("could not find best audio stream");
74    let context = ffmpeg_rs::codec::context::Context::from_parameters(input.parameters())?;
75    let mut decoder = context.decoder().audio()?;
76    let codec = ffmpeg_rs::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_rs::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_rs::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_rs::channel_layout::ChannelLayout::STEREO);
94
95    if global {
96        encoder.set_flags(ffmpeg_rs::codec::flag::Flags::GLOBAL_HEADER);
97    }
98
99    encoder.set_rate(decoder.rate() as i32);
100    encoder.set_channel_layout(channel_layout);
101    encoder.set_channels(channel_layout.channels());
102    encoder.set_format(
103        codec
104            .formats()
105            .expect("unknown supported formats")
106            .next()
107            .unwrap(),
108    );
109    encoder.set_bit_rate(decoder.bit_rate());
110    encoder.set_max_bit_rate(decoder.max_bit_rate());
111
112    encoder.set_time_base((1, decoder.rate() as i32));
113    output.set_time_base((1, decoder.rate() as i32));
114
115    let encoder = encoder.open_as(codec)?;
116    output.set_parameters(&encoder);
117
118    let filter = filter(filter_spec, &decoder, &encoder)?;
119
120    let in_time_base = decoder.time_base();
121    let out_time_base = output.time_base();
122
123    Ok(Transcoder {
124        stream: input.index(),
125        filter,
126        decoder,
127        encoder,
128        in_time_base,
129        out_time_base,
130    })
131}
132
133impl Transcoder {
134    fn send_frame_to_encoder(&mut self, frame: &ffmpeg_rs::Frame) {
135        self.encoder.send_frame(frame).unwrap();
136    }
137
138    fn send_eof_to_encoder(&mut self) {
139        self.encoder.send_eof().unwrap();
140    }
141
142    fn receive_and_process_encoded_packets(&mut self, octx: &mut format::context::Output) {
143        let mut encoded = ffmpeg_rs::Packet::empty();
144        while self.encoder.receive_packet(&mut encoded).is_ok() {
145            encoded.set_stream(0);
146            encoded.rescale_ts(self.in_time_base, self.out_time_base);
147            encoded.write_interleaved(octx).unwrap();
148        }
149    }
150
151    fn add_frame_to_filter(&mut self, frame: &ffmpeg_rs::Frame) {
152        self.filter.get("in").unwrap().source().add(frame).unwrap();
153    }
154
155    fn flush_filter(&mut self) {
156        self.filter.get("in").unwrap().source().flush().unwrap();
157    }
158
159    fn get_and_process_filtered_frames(&mut self, octx: &mut format::context::Output) {
160        let mut filtered = frame::Audio::empty();
161        while self
162            .filter
163            .get("out")
164            .unwrap()
165            .sink()
166            .frame(&mut filtered)
167            .is_ok()
168        {
169            self.send_frame_to_encoder(&filtered);
170            self.receive_and_process_encoded_packets(octx);
171        }
172    }
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pub fn dump(&self) -> String

Examples found in repository?
examples/transcode-audio.rs (line 37)
8fn filter(
9    spec: &str,
10    decoder: &codec::decoder::Audio,
11    encoder: &codec::encoder::Audio,
12) -> Result<filter::Graph, ffmpeg_rs::Error> {
13    let mut filter = filter::Graph::new();
14
15    let args = format!(
16        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
17        decoder.time_base(),
18        decoder.rate(),
19        decoder.format().name(),
20        decoder.channel_layout().bits()
21    );
22
23    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
24    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
25
26    {
27        let mut out = filter.get("out").unwrap();
28
29        out.set_sample_format(encoder.format());
30        out.set_channel_layout(encoder.channel_layout());
31        out.set_sample_rate(encoder.rate());
32    }
33
34    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
35    filter.validate()?;
36
37    println!("{}", filter.dump());
38
39    if let Some(codec) = encoder.codec() {
40        if !codec
41            .capabilities()
42            .contains(ffmpeg_rs::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
43        {
44            filter
45                .get("out")
46                .unwrap()
47                .sink()
48                .set_frame_size(encoder.frame_size());
49        }
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 34)
8fn filter(
9    spec: &str,
10    decoder: &codec::decoder::Audio,
11    encoder: &codec::encoder::Audio,
12) -> Result<filter::Graph, ffmpeg_rs::Error> {
13    let mut filter = filter::Graph::new();
14
15    let args = format!(
16        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
17        decoder.time_base(),
18        decoder.rate(),
19        decoder.format().name(),
20        decoder.channel_layout().bits()
21    );
22
23    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
24    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
25
26    {
27        let mut out = filter.get("out").unwrap();
28
29        out.set_sample_format(encoder.format());
30        out.set_channel_layout(encoder.channel_layout());
31        out.set_sample_rate(encoder.rate());
32    }
33
34    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
35    filter.validate()?;
36
37    println!("{}", filter.dump());
38
39    if let Some(codec) = encoder.codec() {
40        if !codec
41            .capabilities()
42            .contains(ffmpeg_rs::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
43        {
44            filter
45                .get("out")
46                .unwrap()
47                .sink()
48                .set_frame_size(encoder.frame_size());
49        }
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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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.