From a4982bb4d3fd9908aa01c824ac6202ac8618ac24 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 17 Oct 2015 02:48:59 +0300
Subject: [PATCH] Support changing audio and SPU channels

---
 source/client.cpp     | 42 +++++++++++++++++++++++++++++
 source/client.h       |  3 +++
 source/xinestream.cpp | 63 ++++++++++++++++++++++++++++++++++++++++++-
 source/xinestream.h   | 13 +++++++++
 4 files changed, 120 insertions(+), 1 deletion(-)

diff --git a/source/client.cpp b/source/client.cpp
index 8c84e26..6047796 100644
--- a/source/client.cpp
+++ b/source/client.cpp
@@ -94,6 +94,10 @@ void Client::process_command(const string &cmd)
 		get_stream().pause();
 	else if(keyword=="stop")
 		get_stream().stop();
+	else if(keyword=="select_audio")
+		set_audio_channel(args);
+	else if(keyword=="select_spu")
+		set_spu_channel(args);
 	else
 		throw runtime_error("Invalid command");
 }
@@ -126,12 +130,31 @@ void Client::list_directory(const FS::Path &dn)
 	}
 }
 
+void Client::set_audio_channel(const string &arg)
+{
+	XineStream &stream = get_stream();
+	if(arg=="off")
+		stream.set_audio_off();
+	else
+		stream.set_audio_channel(lexical_cast<unsigned>(arg));
+}
+
+void Client::set_spu_channel(const string &arg)
+{
+	XineStream &stream = get_stream();
+	if(arg=="off")
+		stream.set_spu_off();
+	else
+		stream.set_spu_channel(lexical_cast<unsigned>(arg));
+}
+
 void Client::stream_created(XineStream &stream)
 {
 	stream.signal_state_changed.connect(sigc::mem_fun(this, &Client::stream_state_changed));
 	stream.signal_title_changed.connect(sigc::mem_fun(this, &Client::stream_title_changed));
 	stream.signal_duration_changed.connect(sigc::mem_fun(this, &Client::stream_duration_changed));
 	stream.signal_position_changed.connect(sigc::mem_fun(this, &Client::stream_position_changed));
+	stream.signal_channels_changed.connect(sigc::mem_fun(this, &Client::stream_channels_changed));
 
 	MutexLock lock(stream.get_mutex());
 	stream_state_changed(stream.get_state());
@@ -142,6 +165,8 @@ void Client::stream_created(XineStream &stream)
 
 	if(const Time::TimeDelta &dur = stream.get_duration())
 		stream_duration_changed(dur);
+
+	stream_channels_changed();
 }
 
 void Client::stream_destroyed()
@@ -172,3 +197,20 @@ void Client::stream_position_changed(const Time::TimeDelta &pos)
 		last_position = pos;
 	}
 }
+
+void Client::stream_channels_changed()
+{
+	XineStream &stream = get_stream();
+
+	const vector<string> &audio_channels = stream.get_audio_channels();
+	send_reply(format("audio_count %d", audio_channels.size()));
+	for(unsigned i=0; i<audio_channels.size(); ++i)
+		send_reply(format("audio %d %s", i, audio_channels[i]));
+
+	const vector<string> &spu_channels = stream.get_spu_channels();
+	send_reply(format("spu_count %d", spu_channels.size()));
+	for(unsigned i=0; i<spu_channels.size(); ++i)
+		send_reply(format("spu %d %s", i, spu_channels[i]));
+
+	send_reply("channels_end");
+}
diff --git a/source/client.h b/source/client.h
index f1f4dc1..671290e 100644
--- a/source/client.h
+++ b/source/client.h
@@ -32,6 +32,8 @@ private:
 	void process_command(const std::string &);
 	void send_reply(const std::string &);
 	void list_directory(const Msp::FS::Path &);
+	void set_audio_channel(const std::string &);
+	void set_spu_channel(const std::string &);
 
 	void stream_created(XineStream &);
 	void stream_destroyed();
@@ -39,6 +41,7 @@ private:
 	void stream_title_changed(const std::string &);
 	void stream_duration_changed(const Msp::Time::TimeDelta &);
 	void stream_position_changed(const Msp::Time::TimeDelta &);
+	void stream_channels_changed();
 };
 
 #endif
diff --git a/source/xinestream.cpp b/source/xinestream.cpp
index 6cc3d75..a702b28 100644
--- a/source/xinestream.cpp
+++ b/source/xinestream.cpp
@@ -7,7 +7,8 @@ using namespace Msp;
 
 XineStream::XineStream(XineEngine &e, const string &mrl):
 	engine(e),
-	state(STOPPED)
+	state(STOPPED),
+	channels_changed(false)
 {
 	stream = xine_stream_new(engine.get_engine(), engine.get_audio_driver(), engine.get_video_driver());
 	xine_open(stream, mrl.c_str());
@@ -15,6 +16,7 @@ XineStream::XineStream(XineEngine &e, const string &mrl):
 	queue = xine_event_new_queue(stream);
 
 	update_info();
+	update_channels();
 
 	engine.add_stream(*this);
 }
@@ -28,6 +30,32 @@ XineStream::~XineStream()
 	xine_dispose(stream);
 }
 
+void XineStream::set_audio_channel(unsigned i)
+{
+	if(i>=audio_channels.size())
+		throw out_of_range("XineStream::set_audio_channel");
+
+	xine_set_param(stream, XINE_PARAM_AUDIO_CHANNEL_LOGICAL, i);
+}
+
+void XineStream::set_audio_off()
+{
+	xine_set_param(stream, XINE_PARAM_AUDIO_CHANNEL_LOGICAL, -2);
+}
+
+void XineStream::set_spu_channel(unsigned i)
+{
+	if(i>=spu_channels.size())
+		throw out_of_range("XineStream::set_spu_channel");
+
+	xine_set_param(stream, XINE_PARAM_SPU_CHANNEL, i);
+}
+
+void XineStream::set_spu_off()
+{
+	xine_set_param(stream, XINE_PARAM_SPU_CHANNEL, -2);
+}
+
 void XineStream::play()
 {
 	if(state==STOPPED)
@@ -82,6 +110,12 @@ void XineStream::tick()
 	}
 
 	update_info();
+
+	if(channels_changed)
+	{
+		channels_changed = false;
+		update_channels();
+	}
 }
 
 void XineStream::update_info()
@@ -112,6 +146,30 @@ void XineStream::update_info()
 	}
 }
 
+void XineStream::update_channels()
+{
+	MutexLock lock(mutex);
+	char langbuf[XINE_LANG_MAX];
+
+	unsigned n_audio = xine_get_stream_info(stream, XINE_STREAM_INFO_MAX_AUDIO_CHANNEL);
+	audio_channels.resize(n_audio);
+	for(unsigned i=0; i<n_audio; ++i)
+	{
+		xine_get_audio_lang(stream, i, langbuf);
+		audio_channels[i].assign(langbuf);
+	}
+
+	unsigned n_spu = xine_get_stream_info(stream, XINE_STREAM_INFO_MAX_SPU_CHANNEL);
+	spu_channels.resize(n_spu);
+	for(unsigned i=0; i<n_spu; ++i)
+	{
+		xine_get_spu_lang(stream, i, langbuf);
+		spu_channels[i].assign(langbuf);
+	}
+
+	signal_channels_changed.emit();
+}
+
 void XineStream::handle_event(const xine_event_t &event)
 {
 	switch(event.type)
@@ -120,6 +178,9 @@ void XineStream::handle_event(const xine_event_t &event)
 		set_state(STOPPED);
 		signal_finished.emit();
 		break;
+	case XINE_EVENT_UI_CHANNELS_CHANGED:
+		channels_changed = true;
+		break;
 	}
 }
 
diff --git a/source/xinestream.h b/source/xinestream.h
index 65f25ab..c5778c7 100644
--- a/source/xinestream.h
+++ b/source/xinestream.h
@@ -2,6 +2,7 @@
 #define XINESTREAM_H_
 
 #include <string>
+#include <vector>
 #include <xine.h>
 #include <msp/core/mutex.h>
 #include <msp/strings/lexicalcast.h>
@@ -23,6 +24,8 @@ public:
 	sigc::signal<void, const std::string &> signal_title_changed;
 	sigc::signal<void, const Msp::Time::TimeDelta &> signal_duration_changed;
 	sigc::signal<void, const Msp::Time::TimeDelta &> signal_position_changed;
+	sigc::signal<void> signal_channels_changed;
+	sigc::signal<void> signal_finished;
 
 private:
 	XineEngine &engine;
@@ -33,6 +36,9 @@ private:
 	std::string title;
 	Msp::Time::TimeDelta duration;
 	Msp::Time::TimeDelta position;
+	std::vector<std::string> audio_channels;
+	std::vector<std::string> spu_channels;
+	bool channels_changed;
 
 public:
 	XineStream(XineEngine &, const std::string &);
@@ -43,6 +49,12 @@ public:
 	const Msp::Time::TimeDelta &get_duration() const { return duration; }
 	const Msp::Time::TimeDelta &get_position() const { return position; }
 	const std::string &get_title() const { return title; }
+	const std::vector<std::string> &get_audio_channels() const { return audio_channels; }
+	const std::vector<std::string> &get_spu_channels() const { return spu_channels; }
+	void set_audio_channel(unsigned);
+	void set_audio_off();
+	void set_spu_channel(unsigned);
+	void set_spu_off();
 
 	void play();
 	void seek(const Msp::Time::TimeDelta &);
@@ -55,6 +67,7 @@ public:
 	void tick();
 private:
 	void update_info();
+	void update_channels();
 	void handle_event(const xine_event_t &);
 };
 
-- 
2.43.0