From 0f2e18987be3eb2b43e054bd7ade07f7f8361983 Mon Sep 17 00:00:00 2001
From: Seungha Yang <seungha@centricular.com>
Date: Mon, 24 Jul 2023 22:51:07 +0900
Subject: [PATCH] transcriberbin: Configure audioresample in front of
 transcriber

Allows any samplerate and make it negotiable. Fixing a scenario
where transcriberbin is configured with passthrough enabled,
(and negotiated samplerate is not supported by transcriber)
and then setting passthrough=false later during playback.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1330>
---
 video/closedcaption/src/transcriberbin/imp.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/video/closedcaption/src/transcriberbin/imp.rs b/video/closedcaption/src/transcriberbin/imp.rs
index 6ecd9d08..3e8c283d 100644
--- a/video/closedcaption/src/transcriberbin/imp.rs
+++ b/video/closedcaption/src/transcriberbin/imp.rs
@@ -38,6 +38,7 @@ struct State {
     audio_queue_passthrough: gst::Element,
     video_queue: gst::Element,
     audio_tee: gst::Element,
+    transcriber_resample: gst::Element,
     transcriber_aconv: gst::Element,
     transcriber: gst::Element,
     transcriber_queue: gst::Element,
@@ -99,6 +100,7 @@ impl TranscriberBin {
 
         state.transcription_bin.add_many(&[
             &aqueue_transcription,
+            &state.transcriber_resample,
             &state.transcriber_aconv,
             &state.transcriber,
             &state.transcriber_queue,
@@ -111,6 +113,7 @@ impl TranscriberBin {
 
         gst::Element::link_many(&[
             &aqueue_transcription,
+            &state.transcriber_resample,
             &state.transcriber_aconv,
             &state.transcriber,
             &state.transcriber_queue,
@@ -457,6 +460,7 @@ impl TranscriberBin {
         let tttocea608 = gst::ElementFactory::make("tttocea608")
             .name("tttocea608")
             .build()?;
+        let transcriber_resample = gst::ElementFactory::make("audioresample").build()?;
         let transcriber_aconv = gst::ElementFactory::make("audioconvert").build()?;
         let transcriber = gst::ElementFactory::make("awstranscriber")
             .name("transcriber")
@@ -474,6 +478,7 @@ impl TranscriberBin {
             internal_bin,
             audio_queue_passthrough,
             video_queue,
+            transcriber_resample,
             transcriber_aconv,
             transcriber,
             transcriber_queue,