decoder/Bridge: move code to DecoderControl::SetReady()

src/decoder/Bridge.cxx

@@ -248,27 +248,20 @@ DecoderBridge::Ready(const AudioFormat audio_format,
 {
 	struct audio_format_string af_string;
 
-	assert(dc.state == DecoderState::START);
-	assert(dc.pipe != nullptr);
-	assert(dc.pipe->IsEmpty());
 	assert(convert == nullptr);
 	assert(stream_tag == nullptr);
 	assert(decoder_tag == nullptr);
 	assert(!seeking);
-	assert(audio_format.IsDefined());
-	assert(audio_format.IsValid());
-
-	dc.in_audio_format = audio_format;
-	dc.out_audio_format = audio_format;
-	dc.out_audio_format.ApplyMask(dc.configured_audio_format);
-
-	dc.seekable = seekable;
-	dc.total_time = duration;
 
 	FormatDebug(decoder_domain, "audio_format=%s, seekable=%s",
-		    audio_format_to_string(dc.in_audio_format, &af_string),
+		    audio_format_to_string(audio_format, &af_string),
 		    seekable ? "true" : "false");
 
+	{
+		const ScopeLock protect(dc.mutex);
+		dc.SetReady(audio_format, seekable, duration);
+	}
+
 	if (dc.in_audio_format != dc.out_audio_format) {
 		FormatDebug(decoder_domain, "converting to %s",
 			    audio_format_to_string(dc.out_audio_format,
@@ -283,10 +276,6 @@ DecoderBridge::Ready(const AudioFormat audio_format,
 			error = std::current_exception();
 		}
 	}
-
-	const ScopeLock protect(dc.mutex);
-	dc.state = DecoderState::DECODE;
-	dc.client_cond.signal();
 }
 
 DecoderCommand

src/decoder/DecoderControl.cxx

@@ -53,6 +53,27 @@ DecoderControl::WaitForDecoder()
 	client_is_waiting = false;
 }
 
+void
+DecoderControl::SetReady(const AudioFormat audio_format,
+			 bool _seekable, SignedSongTime _duration)
+{
+	assert(state == DecoderState::START);
+	assert(pipe != nullptr);
+	assert(pipe->IsEmpty());
+	assert(audio_format.IsDefined());
+	assert(audio_format.IsValid());
+
+	in_audio_format = audio_format;
+	out_audio_format = audio_format;
+	out_audio_format.ApplyMask(configured_audio_format);
+
+	seekable = _seekable;
+	total_time = _duration;
+
+	state = DecoderState::DECODE;
+	client_cond.signal();
+}
+
 bool
 DecoderControl::IsCurrentSong(const DetachedSong &_song) const
 {

src/decoder/DecoderControl.hxx

@@ -255,6 +255,15 @@ struct DecoderControl {
 	}
 
 	/**
+	 * Transition this obejct from DecoderState::START to
+	 * DecoderState::DECODE.
+	 *
+	 * Caller must lock the object.
+	 */
+	void SetReady(const AudioFormat audio_format,
+		      bool _seekable, SignedSongTime _duration);
+
+	/**
 	 * Checks whether an error has occurred, and if so, rethrows
 	 * it.
 	 *