gstreamer-rs/gstreamer-audio/src/functions.rs

// Copyright (C) 2017-2020 Sebastian Dröge <sebastian@centricular.com>
// Copyright (C) 2020 Guillaume Desmottes <guillaume.desmottes@collabora.com>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use glib;
use glib::translate::{from_glib_full, ToGlibPtr};
use glib::ToSendValue;
use gst;

use std::i32;

pub fn audio_buffer_clip(
    buffer: gst::Buffer,
    segment: &gst::Segment,
    rate: u32,
    bpf: u32,
) -> Option<gst::Buffer> {
    skip_assert_initialized!();

    unsafe {
        from_glib_full(gst_audio_sys::gst_audio_buffer_clip(
            buffer.into_ptr(),
            segment.to_glib_none().0,
            rate as i32,
            bpf as i32,
        ))
    }
}

#[cfg(any(feature = "v1_16", feature = "dox"))]
pub fn audio_buffer_truncate(
    buffer: gst::Buffer,
    bpf: u32,
    trim: usize,
    samples: Option<usize>,
) -> gst::Buffer {
    skip_assert_initialized!();

    unsafe {
        from_glib_full(gst_audio_sys::gst_audio_buffer_truncate(
            buffer.into_ptr(),
            bpf as i32,
            trim,
            samples.unwrap_or(std::usize::MAX),
        ))
    }
}

pub fn audio_make_raw_caps(
    formats: &[::AudioFormat],
    layout: ::AudioLayout,
) -> gst::caps::Builder<gst::caps::NoFeature> {
    assert_initialized_main_thread!();

    let formats: Vec<glib::SendValue> = formats
        .iter()
        .map(|f| match f {
            ::AudioFormat::Encoded => panic!("Invalid encoded format"),
            ::AudioFormat::Unknown => panic!("Invalid unknown format"),
            _ => f.to_string().to_send_value(),
        })
        .collect();

    let builder = gst::caps::Caps::builder("audio/x-raw")
        .field("format", &gst::List::from_owned(formats))
        .field("rate", &gst::IntRange::<i32>::new(1, i32::MAX))
        .field("channels", &gst::IntRange::<i32>::new(1, i32::MAX));

    match layout {
        ::AudioLayout::Interleaved => builder.field("layout", &"interleaved"),
        ::AudioLayout::NonInterleaved => builder.field("layout", &"non-interleaved"),
        ::AudioLayout::__Unknown(_) => builder,
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use gst;

    #[test]
    fn audio_caps() {
        gst::init().unwrap();

        let caps = audio_make_raw_caps(
            &[::AudioFormat::S16be, ::AudioFormat::S16le],
            ::AudioLayout::Interleaved,
        )
        .build();
        assert_eq!(caps.to_string(), "audio/x-raw, format=(string){ S16BE, S16LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string)interleaved");

        #[cfg(feature = "v1_18")]
        {
            use glib::translate::{from_glib_full, ToGlib};

            /* audio_make_raw_caps() is a re-implementation so ensure it returns the same caps as the C API */
            let c_caps = unsafe {
                let formats: Vec<gst_audio_sys::GstAudioFormat> =
                    [::AudioFormat::S16be, ::AudioFormat::S16le]
                        .iter()
                        .map(|f| f.to_glib())
                        .collect();
                let caps = gst_audio_sys::gst_audio_make_raw_caps(
                    formats.as_ptr(),
                    formats.len() as u32,
                    gst_audio_sys::GST_AUDIO_LAYOUT_INTERLEAVED,
                );
                from_glib_full(caps)
            };
            assert_eq!(caps, c_caps);
        }

        let caps = audio_make_raw_caps(
            &[::AudioFormat::S16be, ::AudioFormat::S16le],
            ::AudioLayout::NonInterleaved,
        )
        .field("rate", &16000)
        .field("channels", &2)
        .build();
        assert_eq!(
            caps.to_string(),
            "audio/x-raw, format=(string){ S16BE, S16LE }, rate=(int)16000, channels=(int)2, layout=(string)non-interleaved"
        );
    }

    #[test]
    #[should_panic(expected = "Invalid encoded format")]
    fn audio_caps_encoded() {
        gst::init().unwrap();
        audio_make_raw_caps(&[::AudioFormat::Encoded], ::AudioLayout::Interleaved);
    }

    #[test]
    #[should_panic(expected = "Invalid unknown format")]
    fn audio_caps_unknown() {
        gst::init().unwrap();
        audio_make_raw_caps(&[::AudioFormat::Unknown], ::AudioLayout::Interleaved);
    }
}