2019-10-13 10:21:09 +00:00
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// Copyright (C) 2019 Ruben Gonzalez <rgonzalez@fluendo.com>
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use glib::subclass;
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use glib::subclass::prelude::*;
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use gst::subclass::prelude::*;
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use gst_audio::prelude::*;
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use gst_audio::subclass::prelude::*;
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use std::io::Cursor;
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use atomic_refcell::AtomicRefCell;
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use byte_slice_cast::*;
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struct State {
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streaminfo: Option<claxon::metadata::StreamInfo>,
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audio_info: Option<gst_audio::AudioInfo>,
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}
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2020-11-14 16:52:56 +00:00
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pub struct ClaxonDec {
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2019-10-13 10:21:09 +00:00
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cat: gst::DebugCategory,
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state: AtomicRefCell<Option<State>>,
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}
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impl ObjectSubclass for ClaxonDec {
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const NAME: &'static str = "ClaxonDec";
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type Type = super::ClaxonDec;
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2019-10-13 10:21:09 +00:00
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type ParentType = gst_audio::AudioDecoder;
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type Instance = gst::subclass::ElementInstanceStruct<Self>;
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type Class = subclass::simple::ClassStruct<Self>;
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glib_object_subclass!();
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fn new() -> Self {
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Self {
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cat: gst::DebugCategory::new(
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"claxondec",
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gst::DebugColorFlags::empty(),
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Some("Claxon FLAC decoder"),
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),
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state: AtomicRefCell::new(None),
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}
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}
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2020-11-14 16:52:56 +00:00
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fn class_init(klass: &mut Self::Class) {
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2019-10-13 10:21:09 +00:00
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klass.set_metadata(
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"Claxon FLAC decoder",
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"Decoder/Audio",
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"Claxon FLAC decoder",
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"Ruben Gonzalez <rgonzalez@fluendo.com>",
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);
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let sink_caps = gst::Caps::new_simple("audio/x-flac", &[("framed", &true)]);
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let sink_pad_template = gst::PadTemplate::new(
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"sink",
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gst::PadDirection::Sink,
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gst::PadPresence::Always,
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&sink_caps,
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)
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.unwrap();
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klass.add_pad_template(sink_pad_template);
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let src_caps = gst::Caps::new_simple(
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"audio/x-raw",
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&[
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(
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"format",
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&gst::List::new(&[
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&gst_audio::AudioFormat::S8.to_str(),
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&gst_audio::AUDIO_FORMAT_S16.to_str(),
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&gst_audio::AUDIO_FORMAT_S2432.to_str(),
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&gst_audio::AUDIO_FORMAT_S32.to_str(),
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]),
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),
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("rate", &gst::IntRange::<i32>::new(1, 655_350)),
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("channels", &gst::IntRange::<i32>::new(1, 8)),
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("layout", &"interleaved"),
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],
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);
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let src_pad_template = gst::PadTemplate::new(
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"src",
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gst::PadDirection::Src,
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gst::PadPresence::Always,
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&src_caps,
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)
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.unwrap();
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klass.add_pad_template(src_pad_template);
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}
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}
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2020-07-26 15:33:14 +00:00
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impl ObjectImpl for ClaxonDec {}
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impl ElementImpl for ClaxonDec {}
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impl AudioDecoderImpl for ClaxonDec {
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fn stop(&self, _element: &Self::Type) -> Result<(), gst::ErrorMessage> {
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*self.state.borrow_mut() = None;
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Ok(())
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}
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2020-11-14 16:52:56 +00:00
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fn start(&self, _element: &Self::Type) -> Result<(), gst::ErrorMessage> {
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*self.state.borrow_mut() = Some(State {
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streaminfo: None,
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audio_info: None,
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});
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Ok(())
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}
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2020-11-14 16:52:56 +00:00
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fn set_format(&self, element: &Self::Type, caps: &gst::Caps) -> Result<(), gst::LoggableError> {
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gst_debug!(self.cat, obj: element, "Setting format {:?}", caps);
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let mut streaminfo: Option<claxon::metadata::StreamInfo> = None;
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let mut audio_info: Option<gst_audio::AudioInfo> = None;
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let s = caps.get_structure(0).unwrap();
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if let Ok(Some(streamheaders)) = s.get_optional::<gst::Array>("streamheader") {
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let streamheaders = streamheaders.as_slice();
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if streamheaders.len() < 2 {
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gst_debug!(
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self.cat,
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obj: element,
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"Not enough streamheaders, trying in-band"
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);
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} else {
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let ident_buf = streamheaders[0].get::<gst::Buffer>();
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if let Ok(Some(ident_buf)) = ident_buf {
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gst_debug!(self.cat, obj: element, "Got streamheader buffers");
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let inmap = ident_buf.map_readable().unwrap();
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if inmap[0..7] != [0x7f, b'F', b'L', b'A', b'C', 0x01, 0x00] {
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gst_debug!(self.cat, obj: element, "Unknown streamheader format");
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2020-01-20 06:13:43 +00:00
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} else if let Ok(tstreaminfo) = get_claxon_streaminfo(&inmap[13..]) {
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if let Ok(taudio_info) = get_gstaudioinfo(tstreaminfo) {
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// To speed up negotiation
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if element.set_output_format(&taudio_info).is_err()
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|| element.negotiate().is_err()
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{
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gst_debug!(
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self.cat,
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obj: element,
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"Error to negotiate output from based on in-caps streaminfo"
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);
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}
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audio_info = Some(taudio_info);
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streaminfo = Some(tstreaminfo);
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}
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}
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}
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}
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}
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let mut state_guard = self.state.borrow_mut();
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*state_guard = Some(State {
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streaminfo,
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audio_info,
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});
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Ok(())
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}
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2020-01-20 06:13:43 +00:00
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#[allow(clippy::verbose_bit_mask)]
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fn handle_frame(
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&self,
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element: &Self::Type,
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inbuf: Option<&gst::Buffer>,
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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gst_debug!(self.cat, obj: element, "Handling buffer {:?}", inbuf);
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let inbuf = match inbuf {
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None => return Ok(gst::FlowSuccess::Ok),
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Some(inbuf) => inbuf,
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};
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let inmap = inbuf.map_readable().map_err(|_| {
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gst_error!(self.cat, obj: element, "Failed to buffer readable");
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gst::FlowError::Error
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})?;
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let mut state_guard = self.state.borrow_mut();
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let state = state_guard.as_mut().ok_or(gst::FlowError::NotNegotiated)?;
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if inmap.as_slice() == b"fLaC" {
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gst_debug!(self.cat, obj: element, "fLaC buffer received");
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} else if inmap[0] & 0x7F == 0x00 {
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gst_debug!(self.cat, obj: element, "Streaminfo header buffer received");
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return self.handle_streaminfo_header(element, state, inmap.as_ref());
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} else if inmap[0] == 0b1111_1111 && inmap[1] & 0b1111_1100 == 0b1111_1000 {
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gst_debug!(self.cat, obj: element, "Data buffer received");
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return self.handle_data(element, state, inmap.as_ref());
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} else {
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// info about other headers in flacparse and https://xiph.org/flac/format.html
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gst_debug!(
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self.cat,
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obj: element,
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"Other header buffer received {:?}",
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inmap[0] & 0x7F
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);
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}
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element.finish_frame(None, 1)
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}
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}
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impl ClaxonDec {
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fn handle_streaminfo_header(
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&self,
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element: &super::ClaxonDec,
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state: &mut State,
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indata: &[u8],
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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2020-04-11 09:30:35 +00:00
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let streaminfo = get_claxon_streaminfo(indata).map_err(|e| {
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gst_element_error!(element, gst::StreamError::Decode, [e]);
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gst::FlowError::Error
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})?;
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2020-04-11 09:30:35 +00:00
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let audio_info = get_gstaudioinfo(streaminfo).map_err(|e| {
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gst_element_error!(element, gst::StreamError::Decode, [&e]);
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gst::FlowError::Error
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})?;
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2019-10-13 10:21:09 +00:00
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gst_debug!(
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self.cat,
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obj: element,
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"Successfully parsed headers: {:?}",
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audio_info
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);
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element.set_output_format(&audio_info)?;
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element.negotiate()?;
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state.streaminfo = Some(streaminfo);
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state.audio_info = Some(audio_info);
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element.finish_frame(None, 1)
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}
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fn handle_data(
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&self,
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2020-11-14 16:52:56 +00:00
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element: &super::ClaxonDec,
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state: &mut State,
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indata: &[u8],
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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// TODO It's valid for FLAC to not have any streaminfo header at all, for a small subset
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// of possible FLAC configurations. (claxon does not actually support that)
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let audio_info = state
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.audio_info
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.as_ref()
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.ok_or(gst::FlowError::NotNegotiated)?;
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2020-04-11 10:25:11 +00:00
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let depth = AudioDepth::validate(audio_info.depth())?;
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2020-04-11 10:25:11 +00:00
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let channels = audio_info.channels() as usize;
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if channels > 8 {
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unreachable!(
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"FLAC only supports from 1 to 8 channels (audio contains {} channels)",
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channels
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);
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}
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let buffer = Vec::new();
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let mut cursor = Cursor::new(indata);
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let mut reader = claxon::frame::FrameReader::new(&mut cursor);
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let result = match reader.read_next_or_eof(buffer) {
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Ok(Some(result)) => result,
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Ok(None) => return element.finish_frame(None, 1),
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Err(err) => {
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return gst_audio_decoder_error!(
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element,
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1,
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gst::StreamError::Decode,
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["Failed to decode packet: {:?}", err]
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);
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}
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};
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assert_eq!(cursor.position(), indata.len() as u64);
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let v = if channels != 1 {
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let mut v: Vec<i32> = vec![0; result.len() as usize];
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for (o, i) in v.chunks_exact_mut(channels).enumerate() {
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2020-01-20 06:13:43 +00:00
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for (c, s) in i.iter_mut().enumerate() {
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*s = result.sample(c as u32, o as u32);
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}
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}
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v
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} else {
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result.into_buffer()
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};
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2020-04-11 10:25:11 +00:00
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let depth_adjusted = depth.adjust_samples(v);
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2020-10-13 09:38:02 +00:00
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let outbuf = gst::Buffer::from_mut_slice(depth_adjusted);
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2020-04-11 10:25:11 +00:00
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element.finish_frame(Some(outbuf), 1)
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}
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}
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/// Depth of audio samples
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enum AudioDepth {
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/// 8bits.
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I8,
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/// 16bits.
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I16,
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/// 24bits.
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I24,
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/// 32bits.
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I32,
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}
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2020-10-13 09:38:02 +00:00
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enum ByteVec {
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I8(Vec<i8>),
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I16(Vec<i16>),
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I32(Vec<i32>),
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}
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impl AsRef<[u8]> for ByteVec {
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fn as_ref(&self) -> &[u8] {
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match self {
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ByteVec::I8(ref vec) => vec.as_byte_slice(),
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ByteVec::I16(ref vec) => vec.as_byte_slice(),
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ByteVec::I32(ref vec) => vec.as_byte_slice(),
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}
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}
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}
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impl AsMut<[u8]> for ByteVec {
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fn as_mut(&mut self) -> &mut [u8] {
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match self {
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ByteVec::I8(ref mut vec) => vec.as_mut_byte_slice(),
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ByteVec::I16(ref mut vec) => vec.as_mut_byte_slice(),
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ByteVec::I32(ref mut vec) => vec.as_mut_byte_slice(),
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}
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}
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}
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2020-04-11 10:25:11 +00:00
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impl AudioDepth {
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/// Validate input audio depth.
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fn validate(input: u32) -> Result<Self, gst::FlowError> {
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|
|
let depth = match input {
|
|
|
|
8 => AudioDepth::I8,
|
|
|
|
16 => AudioDepth::I16,
|
|
|
|
24 => AudioDepth::I24,
|
|
|
|
32 => AudioDepth::I32,
|
|
|
|
_ => return Err(gst::FlowError::NotSupported),
|
2019-10-13 10:21:09 +00:00
|
|
|
};
|
2020-04-11 10:25:11 +00:00
|
|
|
Ok(depth)
|
|
|
|
}
|
2019-10-13 10:21:09 +00:00
|
|
|
|
2020-04-11 10:25:11 +00:00
|
|
|
/// Adjust samples depth.
|
|
|
|
///
|
|
|
|
/// This takes a vector of 32bits samples, adjusts the depth of each,
|
|
|
|
/// and returns the adjusted bytes stream.
|
2020-10-13 09:38:02 +00:00
|
|
|
fn adjust_samples(&self, input: Vec<i32>) -> ByteVec {
|
2020-04-11 10:25:11 +00:00
|
|
|
match *self {
|
2020-10-13 09:38:02 +00:00
|
|
|
AudioDepth::I8 => ByteVec::I8(input.into_iter().map(|x| x as i8).collect::<Vec<_>>()),
|
|
|
|
AudioDepth::I16 => {
|
|
|
|
ByteVec::I16(input.into_iter().map(|x| x as i16).collect::<Vec<_>>())
|
|
|
|
}
|
|
|
|
AudioDepth::I24 | AudioDepth::I32 => ByteVec::I32(input),
|
2020-04-11 10:25:11 +00:00
|
|
|
}
|
2019-10-13 10:21:09 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn get_claxon_streaminfo(indata: &[u8]) -> Result<claxon::metadata::StreamInfo, &'static str> {
|
|
|
|
let mut cursor = Cursor::new(indata);
|
|
|
|
let mut metadata_iter = claxon::metadata::MetadataBlockReader::new(&mut cursor);
|
|
|
|
let streaminfo = match metadata_iter.next() {
|
|
|
|
Some(Ok(claxon::metadata::MetadataBlock::StreamInfo(info))) => info,
|
|
|
|
_ => return Err("Failed to decode STREAMINFO"),
|
|
|
|
};
|
|
|
|
|
|
|
|
assert_eq!(cursor.position(), indata.len() as u64);
|
|
|
|
|
|
|
|
Ok(streaminfo)
|
|
|
|
}
|
|
|
|
|
|
|
|
fn get_gstaudioinfo(
|
|
|
|
streaminfo: claxon::metadata::StreamInfo,
|
2020-04-11 09:30:35 +00:00
|
|
|
) -> Result<gst_audio::AudioInfo, String> {
|
2019-10-13 10:21:09 +00:00
|
|
|
let format = match streaminfo.bits_per_sample {
|
|
|
|
8 => gst_audio::AudioFormat::S8,
|
|
|
|
16 => gst_audio::AUDIO_FORMAT_S16,
|
|
|
|
24 => gst_audio::AUDIO_FORMAT_S2432,
|
|
|
|
32 => gst_audio::AUDIO_FORMAT_S32,
|
2020-04-11 09:30:35 +00:00
|
|
|
_ => return Err("format not supported".to_string()),
|
2019-10-13 10:21:09 +00:00
|
|
|
};
|
|
|
|
|
2020-04-11 09:30:35 +00:00
|
|
|
let index = match streaminfo.channels as usize {
|
|
|
|
0 => return Err("no channels".to_string()),
|
|
|
|
n if n > 8 => return Err("more than 8 channels, not supported yet".to_string()),
|
|
|
|
n => n,
|
|
|
|
};
|
2019-10-13 10:21:09 +00:00
|
|
|
let to = &FLAC_CHANNEL_POSITIONS[index - 1][..index];
|
2020-04-11 09:30:35 +00:00
|
|
|
let info_builder =
|
2020-06-25 16:49:07 +00:00
|
|
|
gst_audio::AudioInfo::builder(format, streaminfo.sample_rate, streaminfo.channels)
|
2020-04-11 09:30:35 +00:00
|
|
|
.positions(to);
|
|
|
|
|
|
|
|
let audio_info = info_builder
|
|
|
|
.build()
|
|
|
|
.map_err(|e| format!("failed to build audio info: {}", e))?;
|
2019-10-13 10:21:09 +00:00
|
|
|
|
2020-04-11 09:30:35 +00:00
|
|
|
Ok(audio_info)
|
2019-10-13 10:21:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9
|
|
|
|
// http://flac.sourceforge.net/format.html#frame_header
|
|
|
|
const FLAC_CHANNEL_POSITIONS: [[gst_audio::AudioChannelPosition; 8]; 8] = [
|
|
|
|
[
|
|
|
|
gst_audio::AudioChannelPosition::Mono,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
],
|
|
|
|
[
|
|
|
|
gst_audio::AudioChannelPosition::FrontLeft,
|
|
|
|
gst_audio::AudioChannelPosition::FrontRight,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
],
|
|
|
|
[
|
|
|
|
gst_audio::AudioChannelPosition::FrontLeft,
|
|
|
|
gst_audio::AudioChannelPosition::FrontCenter,
|
|
|
|
gst_audio::AudioChannelPosition::FrontRight,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
],
|
|
|
|
[
|
|
|
|
gst_audio::AudioChannelPosition::FrontLeft,
|
|
|
|
gst_audio::AudioChannelPosition::FrontRight,
|
|
|
|
gst_audio::AudioChannelPosition::RearLeft,
|
|
|
|
gst_audio::AudioChannelPosition::RearRight,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
],
|
|
|
|
[
|
|
|
|
gst_audio::AudioChannelPosition::FrontLeft,
|
|
|
|
gst_audio::AudioChannelPosition::FrontCenter,
|
|
|
|
gst_audio::AudioChannelPosition::FrontRight,
|
|
|
|
gst_audio::AudioChannelPosition::RearLeft,
|
|
|
|
gst_audio::AudioChannelPosition::RearRight,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
],
|
|
|
|
[
|
|
|
|
gst_audio::AudioChannelPosition::FrontLeft,
|
|
|
|
gst_audio::AudioChannelPosition::FrontCenter,
|
|
|
|
gst_audio::AudioChannelPosition::FrontRight,
|
|
|
|
gst_audio::AudioChannelPosition::RearLeft,
|
|
|
|
gst_audio::AudioChannelPosition::RearRight,
|
|
|
|
gst_audio::AudioChannelPosition::Lfe1,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
],
|
|
|
|
// FIXME: 7/8 channel layouts are not defined in the FLAC specs
|
|
|
|
[
|
|
|
|
gst_audio::AudioChannelPosition::FrontLeft,
|
|
|
|
gst_audio::AudioChannelPosition::FrontCenter,
|
|
|
|
gst_audio::AudioChannelPosition::FrontRight,
|
|
|
|
gst_audio::AudioChannelPosition::SideLeft,
|
|
|
|
gst_audio::AudioChannelPosition::SideRight,
|
|
|
|
gst_audio::AudioChannelPosition::RearCenter,
|
|
|
|
gst_audio::AudioChannelPosition::Lfe1,
|
|
|
|
gst_audio::AudioChannelPosition::Invalid,
|
|
|
|
],
|
|
|
|
[
|
|
|
|
gst_audio::AudioChannelPosition::FrontLeft,
|
|
|
|
gst_audio::AudioChannelPosition::FrontCenter,
|
|
|
|
gst_audio::AudioChannelPosition::FrontRight,
|
|
|
|
gst_audio::AudioChannelPosition::SideLeft,
|
|
|
|
gst_audio::AudioChannelPosition::SideRight,
|
|
|
|
gst_audio::AudioChannelPosition::RearLeft,
|
|
|
|
gst_audio::AudioChannelPosition::RearRight,
|
|
|
|
gst_audio::AudioChannelPosition::Lfe1,
|
|
|
|
],
|
|
|
|
];
|