mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-04-27 22:18:45 +00:00
transcriberbin: add support for generating cea708 captions
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1406>
This commit is contained in:
Matthew Waters
parent
b0cf7e5c81
commit
df30d2fbd3
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@ -5563,6 +5563,18 @@
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"type": "GstTtToCea608Mode",
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"writable": true
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},
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"mux-method": {
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"blurb": "The method for muxing multiple transcription streams",
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"conditionally-available": false,
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"construct": false,
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"construct-only": false,
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"controllable": false,
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"default": "cea608 (0)",
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"mutable": "null",
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"readable": true,
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"type": "GstTranscriberBinMuxMethod",
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"writable": true
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},
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"passthrough": {
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"blurb": "Whether transcription should occur",
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"conditionally-available": false,
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@ -5601,7 +5613,7 @@
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"writable": true
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},
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"translation-languages": {
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"blurb": "A map of CEA 608 channels to language codes, eg translation-languages=\"languages, CC1=fr, CC3=transcript\" will map the French translation to CC1 and the original transcript to CC3",
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"blurb": "A map of language codes to caption channels, e.g. translation-languages=\"languages, transcript={CC1, 708_1}, fr={708_2, CC3}\" will map the French translation to CC1/service 1 and the original transcript to CC3/service 2",
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"conditionally-available": false,
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"construct": false,
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"construct-only": false,
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@ -7,6 +7,7 @@
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// SPDX-License-Identifier: MPL-2.0
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use crate::cea608utils::Cea608Mode;
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use crate::cea708utils::Cea708Mode;
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use anyhow::{anyhow, Error};
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use gst::glib;
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use gst::prelude::*;
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@ -33,15 +34,26 @@ const DEFAULT_ACCUMULATE: gst::ClockTime = gst::ClockTime::ZERO;
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const DEFAULT_MODE: Cea608Mode = Cea608Mode::RollUp2;
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const DEFAULT_CAPTION_SOURCE: CaptionSource = CaptionSource::Both;
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const DEFAULT_INPUT_LANG_CODE: &str = "en-US";
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const DEFAULT_MUX_METHOD: MuxMethod = MuxMethod::Cea608;
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const CEA608MUX_LATENCY: gst::ClockTime = gst::ClockTime::from_mseconds(100);
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const CEAX08MUX_LATENCY: gst::ClockTime = gst::ClockTime::from_mseconds(100);
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#[derive(Debug, Copy, Clone, Default, PartialEq, Eq, glib::Enum)]
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#[repr(u32)]
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#[enum_type(name = "GstTranscriberBinMuxMethod")]
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enum MuxMethod {
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#[default]
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Cea608,
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Cea708,
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}
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/* One per language, including original */
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struct TranscriptionChannel {
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bin: gst::Bin,
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textwrap: gst::Element,
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tttocea608: gst::Element,
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tttoceax08: gst::Element,
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language: String,
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ccmux_pad_name: String,
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}
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impl TranscriptionChannel {
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@ -66,6 +78,7 @@ impl TranscriptionChannel {
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}
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struct State {
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mux_method: MuxMethod,
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framerate: Option<gst::Fraction>,
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tearing_down: bool,
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internal_bin: gst::Bin,
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@ -94,6 +107,7 @@ struct Settings {
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caption_source: CaptionSource,
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translation_languages: Option<gst::Structure>,
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language_code: String,
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mux_method: MuxMethod,
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}
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impl Default for Settings {
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@ -110,6 +124,7 @@ impl Default for Settings {
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caption_source: DEFAULT_CAPTION_SOURCE,
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translation_languages: None,
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language_code: String::from(DEFAULT_INPUT_LANG_CODE),
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mux_method: DEFAULT_MUX_METHOD,
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}
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}
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}
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@ -126,29 +141,88 @@ pub struct TranscriberBin {
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}
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impl TranscriberBin {
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fn construct_channel_bin(&self, lang: &str) -> Result<TranscriptionChannel, Error> {
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fn construct_channel_bin(
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&self,
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lang: &str,
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mux_method: MuxMethod,
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caption_streams: Vec<String>,
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) -> Result<TranscriptionChannel, Error> {
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let bin = gst::Bin::new();
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let queue = gst::ElementFactory::make("queue").build()?;
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let textwrap = gst::ElementFactory::make("textwrap").build()?;
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let tttocea608 = gst::ElementFactory::make("tttocea608").build()?;
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let (tttoceax08, ccmux_pad_name) = match mux_method {
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MuxMethod::Cea608 => {
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if caption_streams.len() != 1 {
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anyhow::bail!("Muxing zero/multiple cea608 streams for the same language is not supported");
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}
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(
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gst::ElementFactory::make("tttocea608").build()?,
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caption_streams[0].clone(),
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)
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}
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MuxMethod::Cea708 => {
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if !(1..=2).contains(&caption_streams.len()) {
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anyhow::bail!(
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"Incorrect number of caption stream names {} for muxing 608/708",
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caption_streams.len()
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);
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}
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let mut service_no = None;
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let mut cea608_channel = None;
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for cc in caption_streams.iter() {
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if let Some(cea608) = cc.to_lowercase().strip_prefix("cc") {
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if cea608_channel.is_some() {
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anyhow::bail!(
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"Multiple CEA-608 streams for a language are not supported"
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);
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}
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cea608_channel = Some(cea608.parse::<u32>()?);
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} else if let Some(cea708_service) = cc.strip_prefix("708_") {
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if service_no.is_some() {
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anyhow::bail!(
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"Multiple CEA-708 streams for a language are not supported"
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);
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}
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service_no = Some(cea708_service.parse::<u32>()?);
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} else {
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anyhow::bail!(
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"caption service name does not match \'708_%u\', or cc1, or cc3"
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);
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}
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}
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let service_no = service_no.ok_or(anyhow!("No 708 caption service provided"))?;
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// TODO: handle cea608
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(
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gst::ElementFactory::make("tttocea708")
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.property("service-number", service_no)
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.build()?,
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format!("sink_{}", service_no),
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)
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}
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};
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let capsfilter = gst::ElementFactory::make("capsfilter").build()?;
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let converter = gst::ElementFactory::make("ccconverter").build()?;
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bin.add_many([&queue, &textwrap, &tttocea608, &capsfilter, &converter])?;
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gst::Element::link_many([&queue, &textwrap, &tttocea608, &capsfilter, &converter])?;
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bin.add_many([&queue, &textwrap, &tttoceax08, &capsfilter, &converter])?;
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gst::Element::link_many([&queue, &textwrap, &tttoceax08, &capsfilter, &converter])?;
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queue.set_property("max-size-buffers", 0u32);
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queue.set_property("max-size-time", 0u64);
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textwrap.set_property("lines", 2u32);
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capsfilter.set_property(
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"caps",
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gst::Caps::builder("closedcaption/x-cea-608")
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let caps = match mux_method {
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MuxMethod::Cea608 => gst::Caps::builder("closedcaption/x-cea-608")
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.field("format", "raw")
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.field("framerate", gst::Fraction::new(30000, 1001))
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.build(),
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);
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MuxMethod::Cea708 => gst::Caps::builder("closedcaption/x-cea-708")
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.field("format", "cc_data")
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.field("framerate", gst::Fraction::new(30000, 1001))
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.build(),
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};
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capsfilter.set_property("caps", caps);
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let sinkpad = gst::GhostPad::with_target(&queue.static_pad("sink").unwrap()).unwrap();
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let srcpad = gst::GhostPad::with_target(&converter.static_pad("src").unwrap()).unwrap();
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@ -158,8 +232,9 @@ impl TranscriberBin {
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Ok(TranscriptionChannel {
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bin,
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textwrap,
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tttocea608,
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tttoceax08,
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language: String::from(lang),
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ccmux_pad_name,
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})
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}
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@ -202,19 +277,19 @@ impl TranscriberBin {
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&state.transcription_valve,
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])?;
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for (padname, channel) in &state.transcription_channels {
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for channel in state.transcription_channels.values() {
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state.transcription_bin.add(&channel.bin)?;
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channel.link_transcriber(&state.transcriber)?;
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let ccmux_pad = state
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.ccmux
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.request_pad_simple(padname)
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.request_pad_simple(&channel.ccmux_pad_name)
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.ok_or(anyhow!("Failed to request ccmux sink pad"))?;
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channel.bin.static_pad("src").unwrap().link(&ccmux_pad)?;
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}
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state.ccmux.set_property("latency", CEA608MUX_LATENCY);
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state.ccmux.set_property("latency", CEAX08MUX_LATENCY);
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let transcription_audio_sinkpad =
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gst::GhostPad::with_target(&aqueue_transcription.static_pad("sink").unwrap()).unwrap();
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@ -338,16 +413,22 @@ impl TranscriberBin {
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state.cccapsfilter.set_property("caps", &cc_caps);
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let ccmux_caps = gst::Caps::builder("closedcaption/x-cea-608")
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.field("framerate", state.framerate.unwrap())
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.build();
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let ccmux_caps = match state.mux_method {
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MuxMethod::Cea608 => gst::Caps::builder("closedcaption/x-cea-608")
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.field("framerate", state.framerate.unwrap())
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.build(),
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MuxMethod::Cea708 => gst::Caps::builder("closedcaption/x-cea-708")
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.field("format", "cc_data")
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.field("framerate", state.framerate.unwrap())
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.build(),
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};
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state.ccmux_filter.set_property("caps", ccmux_caps);
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let max_size_time = settings.latency
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+ settings.translate_latency
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+ settings.accumulate_time
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+ CEA608MUX_LATENCY;
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+ CEAX08MUX_LATENCY;
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for queue in [&state.audio_queue_passthrough, &state.video_queue] {
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queue.set_property("max-size-bytes", 0u32);
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@ -463,7 +544,18 @@ impl TranscriberBin {
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gst::debug!(CAT, imp: self, "setting CC mode {:?}", mode);
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for channel in state.transcription_channels.values() {
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channel.tttocea608.set_property("mode", mode);
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match state.mux_method {
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MuxMethod::Cea608 => channel.tttoceax08.set_property("mode", mode),
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MuxMethod::Cea708 => match mode {
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Cea608Mode::PopOn => channel.tttoceax08.set_property("mode", Cea708Mode::PopOn),
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Cea608Mode::PaintOn => {
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channel.tttoceax08.set_property("mode", Cea708Mode::PaintOn)
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}
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Cea608Mode::RollUp2 | Cea608Mode::RollUp3 | Cea608Mode::RollUp4 => {
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channel.tttoceax08.set_property("mode", Cea708Mode::RollUp)
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}
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},
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}
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if mode.is_rollup() {
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channel.textwrap.set_property("accumulate-time", 0u64);
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@ -511,6 +603,73 @@ impl TranscriberBin {
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Ok(())
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}
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fn construct_transcription_channels(
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&self,
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settings: &Settings,
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mux_method: MuxMethod,
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transcription_channels: &mut HashMap<String, TranscriptionChannel>,
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) -> Result<(), Error> {
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if let Some(ref map) = settings.translation_languages {
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for (key, value) in map.iter() {
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let key = key.to_lowercase();
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let (language_code, caption_streams) = match mux_method {
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MuxMethod::Cea608 => {
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if ["cc1", "cc3"].contains(&key.as_str()) {
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(value.get::<String>()?, vec![key.to_string()])
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} else if let Ok(caption_stream) = value.get::<String>() {
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if !["cc1", "cc3"].contains(&caption_stream.as_str()) {
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anyhow::bail!(
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"Unknown 608 channel {}, valid values are cc1, cc3",
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caption_stream
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);
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}
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(key, vec![caption_stream])
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} else {
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anyhow::bail!("Unknown 608 channel/language {}", key);
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}
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}
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MuxMethod::Cea708 => {
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if let Ok(caption_stream) = value.get::<String>() {
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(key, vec![caption_stream])
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} else if let Ok(caption_streams) = value.get::<gst::List>() {
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let mut streams = vec![];
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for s in caption_streams.iter() {
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let service = s.get::<String>()?;
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if ["cc1", "cc3"].contains(&service.as_str())
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|| service.starts_with("708_")
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{
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streams.push(service);
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} else {
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anyhow::bail!("Unknown 708 service {}, valid values are cc1, cc3 or 708_*", key);
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}
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}
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(key, streams)
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} else {
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anyhow::bail!("Unknown 708 translation language field {}", key);
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}
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}
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};
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transcription_channels.insert(
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language_code.to_owned(),
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self.construct_channel_bin(&language_code, mux_method, caption_streams)
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.unwrap(),
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);
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}
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} else {
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let caption_streams = match mux_method {
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MuxMethod::Cea608 => vec!["cc1".to_string()],
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MuxMethod::Cea708 => vec!["cc1".to_string(), "708_1".to_string()],
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};
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transcription_channels.insert(
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"transcript".to_string(),
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self.construct_channel_bin("transcript", mux_method, caption_streams)
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.unwrap(),
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);
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}
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Ok(())
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}
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fn reconfigure_transcription_bin(&self, lang_code_only: bool) -> Result<(), Error> {
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let mut state = self.state.lock().unwrap();
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@ -575,34 +734,20 @@ impl TranscriberBin {
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state.transcription_channels.clear();
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if let Some(ref map) = settings.translation_languages {
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for (key, value) in map.iter() {
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let channel = key.to_lowercase();
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if !["cc1", "cc3"].contains(&channel.as_str()) {
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anyhow::bail!("Unknown 608 channel {}, valid values are cc1, cc3", channel);
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}
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let language_code = value.get::<String>()?;
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self.construct_transcription_channels(
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&settings,
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state.mux_method,
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&mut state.transcription_channels,
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)?;
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state.transcription_channels.insert(
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channel.to_owned(),
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self.construct_channel_bin(&language_code).unwrap(),
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);
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}
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} else {
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state.transcription_channels.insert(
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"cc1".to_string(),
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self.construct_channel_bin("transcript").unwrap(),
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);
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}
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for (padname, channel) in &state.transcription_channels {
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for channel in state.transcription_channels.values() {
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state.transcription_bin.add(&channel.bin)?;
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channel.link_transcriber(&state.transcriber)?;
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let ccmux_pad = state
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.ccmux
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.request_pad_simple(padname)
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.request_pad_simple(&channel.ccmux_pad_name)
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.ok_or(anyhow!("Failed to request ccmux sink pad"))?;
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channel.bin.static_pad("src").unwrap().link(&ccmux_pad)?;
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}
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@ -694,13 +839,13 @@ impl TranscriberBin {
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let settings = self.settings.lock().unwrap();
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if settings.passthrough || received_framerate.is_none() {
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min += settings.latency + settings.accumulate_time + CEA608MUX_LATENCY;
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min += settings.latency + settings.accumulate_time + CEAX08MUX_LATENCY;
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if translating {
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min += settings.translate_latency;
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}
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/* The sub latency introduced by cea608mux */
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/* The sub latency introduced by ceax08mux */
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if let Some(framerate) = received_framerate {
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min += gst::ClockTime::SECOND
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.mul_div_floor(framerate.denom() as u64, framerate.numer() as u64)
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@ -745,34 +890,31 @@ impl TranscriberBin {
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let transcription_valve = gst::ElementFactory::make("valve")
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.property_from_str("drop-mode", "transform-to-gap")
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.build()?;
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let ccmux = gst::ElementFactory::make("cea608mux")
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.property_from_str("start-time-selection", "first")
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.build()?;
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let settings = self.settings.lock().unwrap();
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let mux_method = settings.mux_method;
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let ccmux = match mux_method {
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MuxMethod::Cea608 => gst::ElementFactory::make("cea608mux")
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.property_from_str("start-time-selection", "first")
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.build()?,
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MuxMethod::Cea708 => gst::ElementFactory::make("cea708mux")
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.property_from_str("start-time-selection", "first")
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.build()?,
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};
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let ccmux_filter = gst::ElementFactory::make("capsfilter").build()?;
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let mut transcription_channels = HashMap::new();
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if let Some(ref map) = self.settings.lock().unwrap().translation_languages {
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for (key, value) in map.iter() {
|
||||
let channel = key.to_lowercase();
|
||||
if !["cc1", "cc3"].contains(&channel.as_str()) {
|
||||
anyhow::bail!("Unknown 608 channel {}, valid values are cc1, cc3", channel);
|
||||
}
|
||||
let language_code = value.get::<String>()?;
|
||||
|
||||
transcription_channels.insert(
|
||||
channel.to_owned(),
|
||||
self.construct_channel_bin(&language_code).unwrap(),
|
||||
);
|
||||
}
|
||||
} else {
|
||||
transcription_channels.insert(
|
||||
"cc1".to_string(),
|
||||
self.construct_channel_bin("transcript").unwrap(),
|
||||
);
|
||||
}
|
||||
self.construct_transcription_channels(
|
||||
&settings,
|
||||
settings.mux_method,
|
||||
&mut transcription_channels,
|
||||
)?;
|
||||
drop(settings);
|
||||
|
||||
Ok(State {
|
||||
mux_method,
|
||||
framerate: None,
|
||||
internal_bin,
|
||||
audio_queue_passthrough,
|
||||
|
|
@ -929,7 +1071,7 @@ impl ObjectImpl for TranscriberBin {
|
|||
.build(),
|
||||
glib::ParamSpecBoxed::builder::<gst::Structure>("translation-languages")
|
||||
.nick("Translation languages")
|
||||
.blurb("A map of CEA 608 channels to language codes, eg translation-languages=\"languages, CC1=fr, CC3=transcript\" will map the French translation to CC1 and the original transcript to CC3")
|
||||
.blurb("A map of language codes to caption channels, e.g. translation-languages=\"languages, transcript={CC1, 708_1}, fr={708_2, CC3}\" will map the French translation to CC1/service 1 and the original transcript to CC3/service 2")
|
||||
.mutable_playing()
|
||||
.build(),
|
||||
glib::ParamSpecUInt::builder("translate-latency")
|
||||
|
|
@ -944,6 +1086,12 @@ impl ObjectImpl for TranscriberBin {
|
|||
.default_value(Some(DEFAULT_INPUT_LANG_CODE))
|
||||
.mutable_playing()
|
||||
.build(),
|
||||
glib::ParamSpecEnum::builder("mux-method")
|
||||
.nick("Mux Method")
|
||||
.blurb("The method for muxing multiple transcription streams")
|
||||
.default_value(DEFAULT_MUX_METHOD)
|
||||
.construct()
|
||||
.build(),
|
||||
]
|
||||
});
|
||||
|
||||
|
|
@ -1066,6 +1214,10 @@ impl ObjectImpl for TranscriberBin {
|
|||
self.update_languages(true)
|
||||
}
|
||||
}
|
||||
"mux-method" => {
|
||||
let mut settings = self.settings.lock().unwrap();
|
||||
settings.mux_method = value.get().expect("type checked upstream")
|
||||
}
|
||||
_ => unimplemented!(),
|
||||
}
|
||||
}
|
||||
|
|
@ -1117,6 +1269,10 @@ impl ObjectImpl for TranscriberBin {
|
|||
let settings = self.settings.lock().unwrap();
|
||||
settings.language_code.to_value()
|
||||
}
|
||||
"mux-method" => {
|
||||
let settings = self.settings.lock().unwrap();
|
||||
settings.mux_method.to_value()
|
||||
}
|
||||
_ => unimplemented!(),
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue