PlayerThread: move code into the player class

src/PlayerThread.cxx

@@ -142,6 +142,132 @@ struct player {
 		 cross_fade_chunks(0),
 		 cross_fade_tag(NULL),
 		 elapsed_time(0.0) {}
+
+	void ClearAndDeletePipe() {
+		pipe->Clear(buffer);
+		delete pipe;
+	}
+
+	void ClearAndReplacePipe(MusicPipe *_pipe) {
+		ClearAndDeletePipe();
+		pipe = _pipe;
+	}
+
+	void ReplacePipe(MusicPipe *_pipe) {
+		delete pipe;
+		pipe = _pipe;
+	}
+
+	/**
+	 * Start the decoder.
+	 *
+	 * Player lock is not held.
+	 */
+	void StartDecoder(MusicPipe &pipe);
+
+	/**
+	 * The decoder has acknowledged the "START" command (see
+	 * player::WaitForDecoder()).  This function checks if the decoder
+	 * initialization has completed yet.
+	 *
+	 * The player lock is not held.
+	 */
+	bool CheckDecoderStartup();
+
+	/**
+	 * Stop the decoder and clears (and frees) its music pipe.
+	 *
+	 * Player lock is not held.
+	 */
+	void StopDecoder();
+
+	/**
+	 * Is the decoder still busy on the same song as the player?
+	 *
+	 * Note: this function does not check if the decoder is already
+	 * finished.
+	 */
+	gcc_pure
+	bool IsDecoderAtCurrentSong() const {
+		assert(pipe != nullptr);
+
+		return dc.pipe == pipe;
+	}
+
+	/**
+	 * Returns true if the decoder is decoding the next song (or has begun
+	 * decoding it, or has finished doing it), and the player hasn't
+	 * switched to that song yet.
+	 */
+	gcc_pure
+	bool IsDecoderAtNextSong() const {
+		return dc.pipe != nullptr && !IsDecoderAtCurrentSong();
+	}
+
+	/**
+	 * This is the handler for the #PLAYER_COMMAND_SEEK command.
+	 *
+	 * The player lock is not held.
+	 */
+	bool SeekDecoder();
+
+	/**
+	 * After the decoder has been started asynchronously, wait for
+	 * the "START" command to finish.  The decoder may not be
+	 * initialized yet, i.e. there is no audio_format information
+	 * yet.
+	 *
+	 * The player lock is not held.
+	 */
+	bool WaitForDecoder();
+
+	/**
+	 * Wrapper for audio_output_all_open().  Upon failure, it pauses the
+	 * player.
+	 *
+	 * @return true on success
+	 */
+	bool OpenOutput();
+
+	/**
+	 * Obtains the next chunk from the music pipe, optionally applies
+	 * cross-fading, and sends it to all audio outputs.
+	 *
+	 * @return true on success, false on error (playback will be stopped)
+	 */
+	bool PlayNextChunk();
+
+	/**
+	 * Sends a chunk of silence to the audio outputs.  This is
+	 * called when there is not enough decoded data in the pipe
+	 * yet, to prevent underruns in the hardware buffers.
+	 *
+	 * The player lock is not held.
+	 */
+	bool SendSilence();
+
+	/**
+	 * Player lock must be held before calling.
+	 */
+	void ProcessCommand();
+
+	/**
+	 * This is called at the border between two songs: the audio output
+	 * has consumed all chunks of the current song, and we should start
+	 * sending chunks from the next one.
+	 *
+	 * The player lock is not held.
+	 *
+	 * @return true on success, false on error (playback will be stopped)
+	 */
+	bool SongBorder();
+
+	/*
+	 * The main loop of the player thread, during playback.  This
+	 * is basically a state machine, which multiplexes data
+	 * between the decoder thread and the output threads.
+	 */
+	void Run();
 };
 
 static void
@@ -161,18 +287,10 @@ player_command_finished(player_control &pc)
 	pc.Unlock();
 }
 
-/**
+void
- * Start the decoder.
+player::StartDecoder(MusicPipe &_pipe)
- *
- * Player lock is not held.
- */
-static void
-player_dc_start(player &player, MusicPipe &pipe)
 {
-	player_control &pc = player.pc;
+	assert(queued || pc.command == PLAYER_COMMAND_SEEK);
-	decoder_control &dc = player.dc;
-
-	assert(player.queued || pc.command == PLAYER_COMMAND_SEEK);
 	assert(pc.next_song != NULL);
 
 	unsigned start_ms = pc.next_song->start_ms;
@@ -181,75 +299,33 @@ player_dc_start(player &player, MusicPipe &pipe)
 
 	dc.Start(pc.next_song->DupDetached(),
 		 start_ms, pc.next_song->end_ms,
-		 player.buffer, pipe);
+		 buffer, _pipe);
 }
 
-/**
+void
- * Is the decoder still busy on the same song as the player?
+player::StopDecoder()
- *
- * Note: this function does not check if the decoder is already
- * finished.
- */
-static bool
-player_dc_at_current_song(const player &player)
 {
-	assert(player.pipe != NULL);
-
-	return player.dc.pipe == player.pipe;
-}
-
-/**
- * Returns true if the decoder is decoding the next song (or has begun
- * decoding it, or has finished doing it), and the player hasn't
- * switched to that song yet.
- */
-static bool
-player_dc_at_next_song(const player &player)
-{
-	return player.dc.pipe != NULL && !player_dc_at_current_song(player);
-}
-
-/**
- * Stop the decoder and clears (and frees) its music pipe.
- *
- * Player lock is not held.
- */
-static void
-player_dc_stop(player &player)
-{
-	decoder_control &dc = player.dc;
-
 	dc.Stop();
 
 	if (dc.pipe != NULL) {
 		/* clear and free the decoder pipe */
 
-		dc.pipe->Clear(player.buffer);
+		dc.pipe->Clear(buffer);
 
-		if (dc.pipe != player.pipe)
+		if (dc.pipe != pipe)
 			delete dc.pipe;
 
 		dc.pipe = NULL;
 	}
 }
 
-/**
+bool
- * After the decoder has been started asynchronously, wait for the
+player::WaitForDecoder()
- * "START" command to finish.  The decoder may not be initialized yet,
- * i.e. there is no audio_format information yet.
- *
- * The player lock is not held.
- */
-static bool
-player_wait_for_decoder(player &player)
 {
-	player_control &pc = player.pc;
+	assert(queued || pc.command == PLAYER_COMMAND_SEEK);
-	decoder_control &dc = player.dc;
-
-	assert(player.queued || pc.command == PLAYER_COMMAND_SEEK);
 	assert(pc.next_song != NULL);
 
-	player.queued = false;
+	queued = false;
 
 	Error error = dc.LockGetError();
 	if (error.IsDefined()) {
@@ -264,15 +340,15 @@ player_wait_for_decoder(player &player)
 		return false;
 	}
 
-	if (player.song != NULL)
+	if (song != nullptr)
-		player.song->Free();
+		song->Free();
 
-	player.song = pc.next_song;
+	song = pc.next_song;
-	player.elapsed_time = 0.0;
+	elapsed_time = 0.0;
 
 	/* set the "starting" flag, which will be cleared by
 	   player_check_decoder_startup() */
-	player.decoder_starting = true;
+	decoder_starting = true;
 
 	pc.Lock();
 
@@ -312,26 +388,17 @@ real_song_duration(const Song *song, double decoder_duration)
 	return decoder_duration - song->start_ms / 1000.0;
 }
 
-/**
+bool
- * Wrapper for audio_output_all_open().  Upon failure, it pauses the
+player::OpenOutput()
- * player.
- *
- * @return true on success
- */
-static bool
-player_open_output(player &player)
 {
-	player_control &pc = player.pc;
+	assert(play_audio_format.IsDefined());
-
-	assert(player.play_audio_format.IsDefined());
 	assert(pc.state == PLAYER_STATE_PLAY ||
 	       pc.state == PLAYER_STATE_PAUSE);
 
 	Error error;
-	if (audio_output_all_open(player.play_audio_format, player.buffer,
+	if (audio_output_all_open(play_audio_format, buffer, error)) {
-				  error)) {
+		output_open = true;
-		player.output_open = true;
+		paused = false;
-		player.paused = false;
 
 		pc.Lock();
 		pc.state = PLAYER_STATE_PLAY;
@@ -343,11 +410,11 @@ player_open_output(player &player)
 	} else {
 		g_warning("%s", error.GetMessage());
 
-		player.output_open = false;
+		output_open = false;
 
 		/* pause: the user may resume playback as soon as an
 		   audio output becomes available */
-		player.paused = true;
+		paused = true;
 
 		pc.Lock();
 		pc.SetError(PLAYER_ERROR_OUTPUT, std::move(error));
@@ -360,20 +427,10 @@ player_open_output(player &player)
 	}
 }
 
-/**
+bool
- * The decoder has acknowledged the "START" command (see
+player::CheckDecoderStartup()
- * player_wait_for_decoder()).  This function checks if the decoder
- * initialization has completed yet.
- *
- * The player lock is not held.
- */
-static bool
-player_check_decoder_startup(player &player)
 {
-	player_control &pc = player.pc;
+	assert(decoder_starting);
-	decoder_control &dc = player.dc;
-
-	assert(player.decoder_starting);
 
 	dc.Lock();
 
@@ -392,7 +449,7 @@ player_check_decoder_startup(player &player)
 
 		dc.Unlock();
 
-		if (player.output_open &&
+		if (output_open &&
 		    !audio_output_all_wait(&pc, 1))
 			/* the output devices havn't finished playing
 			   all chunks yet - wait for that */
@@ -405,10 +462,10 @@ player_check_decoder_startup(player &player)
 
 		idle_add(IDLE_PLAYER);
 
-		player.play_audio_format = dc.out_audio_format;
+		play_audio_format = dc.out_audio_format;
-		player.decoder_starting = false;
+		decoder_starting = false;
 
-		if (!player.paused && !player_open_output(player)) {
+		if (!paused && !OpenOutput()) {
 			char *uri = dc.song->GetURI();
 			g_warning("problems opening audio device "
 				  "while playing \"%s\"", uri);
@@ -428,30 +485,23 @@ player_check_decoder_startup(player &player)
 	}
 }
 
-/**
+bool
- * Sends a chunk of silence to the audio outputs.  This is called when
+player::SendSilence()
- * there is not enough decoded data in the pipe yet, to prevent
- * underruns in the hardware buffers.
- *
- * The player lock is not held.
- */
-static bool
-player_send_silence(player &player)
 {
-	assert(player.output_open);
+	assert(output_open);
-	assert(player.play_audio_format.IsDefined());
+	assert(play_audio_format.IsDefined());
 
-	struct music_chunk *chunk = player.buffer.Allocate();
+	struct music_chunk *chunk = buffer.Allocate();
 	if (chunk == NULL) {
 		g_warning("Failed to allocate silence buffer");
 		return false;
 	}
 
 #ifndef NDEBUG
-	chunk->audio_format = player.play_audio_format;
+	chunk->audio_format = play_audio_format;
 #endif
 
-	const size_t frame_size = player.play_audio_format.GetFrameSize();
+	const size_t frame_size = play_audio_format.GetFrameSize();
 	/* this formula ensures that we don't send
 	   partial frames */
 	unsigned num_frames = sizeof(chunk->data) / frame_size;
@@ -463,63 +513,53 @@ player_send_silence(player &player)
 	Error error;
 	if (!audio_output_all_play(chunk, error)) {
 		g_warning("%s", error.GetMessage());
-		player.buffer.Return(chunk);
+		buffer.Return(chunk);
 		return false;
 	}
 
 	return true;
 }
 
-/**
+inline bool
- * This is the handler for the #PLAYER_COMMAND_SEEK command.
+player::SeekDecoder()
- *
- * The player lock is not held.
- */
-static bool player_seek_decoder(player &player)
 {
-	player_control &pc = player.pc;
-	Song *song = pc.next_song;
-	decoder_control &dc = player.dc;
-
 	assert(pc.next_song != NULL);
 
-	const unsigned start_ms = song->start_ms;
+	const unsigned start_ms = pc.next_song->start_ms;
 
-	if (!dc.LockIsCurrentSong(song)) {
+	if (!dc.LockIsCurrentSong(pc.next_song)) {
 		/* the decoder is already decoding the "next" song -
 		   stop it and start the previous song again */
 
-		player_dc_stop(player);
+		StopDecoder();
 
 		/* clear music chunks which might still reside in the
 		   pipe */
-		player.pipe->Clear(player.buffer);
+		pipe->Clear(buffer);
 
 		/* re-start the decoder */
-		player_dc_start(player, *player.pipe);
+		StartDecoder(*pipe);
-		if (!player_wait_for_decoder(player)) {
+		if (!WaitForDecoder()) {
 			/* decoder failure */
 			player_command_finished(pc);
 			return false;
 		}
 	} else {
-		if (!player_dc_at_current_song(player)) {
+		if (!IsDecoderAtCurrentSong()) {
 			/* the decoder is already decoding the "next" song,
 			   but it is the same song file; exchange the pipe */
-			player.pipe->Clear(player.buffer);
+			ClearAndReplacePipe(dc.pipe);
-			delete player.pipe;
-			player.pipe = dc.pipe;
 		}
 
 		pc.next_song->Free();
 		pc.next_song = NULL;
-		player.queued = false;
+		queued = false;
 	}
 
 	/* wait for the decoder to complete initialization */
 
-	while (player.decoder_starting) {
+	while (decoder_starting) {
-		if (!player_check_decoder_startup(player)) {
+		if (!CheckDecoderStartup()) {
 			/* decoder failure */
 			player_command_finished(pc);
 			return false;
@@ -540,28 +580,23 @@ static bool player_seek_decoder(player &player)
 		return false;
 	}
 
-	player.elapsed_time = where;
+	elapsed_time = where;
 
 	player_command_finished(pc);
 
-	player.xfade = XFADE_UNKNOWN;
+	xfade = XFADE_UNKNOWN;
 
 	/* re-fill the buffer after seeking */
-	player.buffering = true;
+	buffering = true;
 
 	audio_output_all_cancel();
 
 	return true;
 }
 
-/**
+inline void
- * Player lock must be held before calling.
+player::ProcessCommand()
- */
-static void player_process_command(player &player)
 {
-	player_control &pc = player.pc;
-	gcc_unused decoder_control &dc = player.dc;
-
 	switch (pc.command) {
 	case PLAYER_COMMAND_NONE:
 	case PLAYER_COMMAND_STOP:
@@ -578,30 +613,30 @@ static void player_process_command(player &player)
 
 	case PLAYER_COMMAND_QUEUE:
 		assert(pc.next_song != NULL);
-		assert(!player.queued);
+		assert(!queued);
-		assert(!player_dc_at_next_song(player));
+		assert(!IsDecoderAtNextSong());
 
-		player.queued = true;
+		queued = true;
 		player_command_finished_locked(pc);
 		break;
 
 	case PLAYER_COMMAND_PAUSE:
 		pc.Unlock();
 
-		player.paused = !player.paused;
+		paused = !paused;
-		if (player.paused) {
+		if (paused) {
 			audio_output_all_pause();
 			pc.Lock();
 
 			pc.state = PLAYER_STATE_PAUSE;
-		} else if (!player.play_audio_format.IsDefined()) {
+		} else if (!play_audio_format.IsDefined()) {
 			/* the decoder hasn't provided an audio format
 			   yet - don't open the audio device yet */
 			pc.Lock();
 
 			pc.state = PLAYER_STATE_PLAY;
 		} else {
-			player_open_output(player);
+			OpenOutput();
 
 			pc.Lock();
 		}
@@ -611,7 +646,7 @@ static void player_process_command(player &player)
 
 	case PLAYER_COMMAND_SEEK:
 		pc.Unlock();
-		player_seek_decoder(player);
+		SeekDecoder();
 		pc.Lock();
 		break;
 
@@ -624,22 +659,22 @@ static void player_process_command(player &player)
 			return;
 		}
 
-		if (player_dc_at_next_song(player)) {
+		if (IsDecoderAtNextSong()) {
 			/* the decoder is already decoding the song -
 			   stop it and reset the position */
 			pc.Unlock();
-			player_dc_stop(player);
+			StopDecoder();
 			pc.Lock();
 		}
 
 		pc.next_song->Free();
 		pc.next_song = NULL;
-		player.queued = false;
+		queued = false;
 		player_command_finished_locked(pc);
 		break;
 
 	case PLAYER_COMMAND_REFRESH:
-		if (player.output_open && !player.paused) {
+		if (output_open && !paused) {
 			pc.Unlock();
 			audio_output_all_check();
 			pc.Lock();
@@ -647,7 +682,7 @@ static void player_process_command(player &player)
 
 		pc.elapsed_time = audio_output_all_get_elapsed_time();
 		if (pc.elapsed_time < 0.0)
-			pc.elapsed_time = player.elapsed_time;
+			pc.elapsed_time = elapsed_time;
 
 		player_command_finished_locked(pc);
 		break;
@@ -714,18 +749,9 @@ play_chunk(player_control &pc,
 	return true;
 }
 
-/**
+inline bool
- * Obtains the next chunk from the music pipe, optionally applies
+player::PlayNextChunk()
- * cross-fading, and sends it to all audio outputs.
- *
- * @return true on success, false on error (playback will be stopped)
- */
-static bool
-play_next_chunk(player &player)
 {
-	player_control &pc = player.pc;
-	decoder_control &dc = player.dc;
-
 	if (!audio_output_all_wait(&pc, 64))
 		/* the output pipe is still large enough, don't send
 		   another chunk */
@@ -733,38 +759,36 @@ play_next_chunk(player &player)
 
 	unsigned cross_fade_position;
 	struct music_chunk *chunk = NULL;
-	if (player.xfade == XFADE_ENABLED &&
+	if (xfade == XFADE_ENABLED && IsDecoderAtNextSong() &&
-	    player_dc_at_next_song(player) &&
+	    (cross_fade_position = pipe->GetSize()) <= cross_fade_chunks) {
-	    (cross_fade_position = player.pipe->GetSize())
-	    <= player.cross_fade_chunks) {
 		/* perform cross fade */
 		music_chunk *other_chunk = dc.pipe->Shift();
 
-		if (!player.cross_fading) {
+		if (!cross_fading) {
 			/* beginning of the cross fade - adjust
 			   crossFadeChunks which might be bigger than
 			   the remaining number of chunks in the old
 			   song */
-			player.cross_fade_chunks = cross_fade_position;
+			cross_fade_chunks = cross_fade_position;
-			player.cross_fading = true;
+			cross_fading = true;
 		}
 
 		if (other_chunk != NULL) {
-			chunk = player.pipe->Shift();
+			chunk = pipe->Shift();
 			assert(chunk != NULL);
 			assert(chunk->other == NULL);
 
 			/* don't send the tags of the new song (which
 			   is being faded in) yet; postpone it until
 			   the current song is faded out */
-			player.cross_fade_tag =
+			cross_fade_tag =
-				Tag::MergeReplace(player.cross_fade_tag,
+				Tag::MergeReplace(cross_fade_tag,
 						  other_chunk->tag);
 			other_chunk->tag = NULL;
 
 			if (std::isnan(pc.mixramp_delay_seconds)) {
 				chunk->mix_ratio = ((float)cross_fade_position)
-					     / player.cross_fade_chunks;
+					     / cross_fade_chunks;
 			} else {
 				chunk->mix_ratio = nan("");
 			}
@@ -777,7 +801,7 @@ play_next_chunk(player &player)
 				   beginning of the new song, we can
 				   easily recover by throwing it away
 				   now */
-				player.buffer.Return(other_chunk);
+				buffer.Return(other_chunk);
 				other_chunk = NULL;
 			}
 
@@ -792,7 +816,7 @@ play_next_chunk(player &player)
 				   cross fading */
 				dc.Unlock();
 
-				player.xfade = XFADE_DISABLED;
+				xfade = XFADE_DISABLED;
 			} else {
 				/* wait for the decoder */
 				dc.Signal();
@@ -805,26 +829,24 @@ play_next_chunk(player &player)
 	}
 
 	if (chunk == NULL)
-		chunk = player.pipe->Shift();
+		chunk = pipe->Shift();
 
 	assert(chunk != NULL);
 
 	/* insert the postponed tag if cross-fading is finished */
 
-	if (player.xfade != XFADE_ENABLED && player.cross_fade_tag != NULL) {
+	if (xfade != XFADE_ENABLED && cross_fade_tag != nullptr) {
-		chunk->tag = Tag::MergeReplace(chunk->tag,
+		chunk->tag = Tag::MergeReplace(chunk->tag, cross_fade_tag);
-					       player.cross_fade_tag);
+		cross_fade_tag = nullptr;
-		player.cross_fade_tag = NULL;
 	}
 
 	/* play the current chunk */
 
 	Error error;
-	if (!play_chunk(player.pc, player.song, chunk, player.buffer,
+	if (!play_chunk(pc, song, chunk, buffer, play_audio_format, error)) {
-			player.play_audio_format, error)) {
 		g_warning("%s", error.GetMessage());
 
-		player.buffer.Return(chunk);
+		buffer.Return(chunk);
 
 		pc.Lock();
 
@@ -833,7 +855,7 @@ play_next_chunk(player &player)
 		/* pause: the user may resume playback as soon as an
 		   audio output becomes available */
 		pc.state = PLAYER_STATE_PAUSE;
-		player.paused = true;
+		paused = true;
 
 		pc.Unlock();
 
@@ -848,45 +870,34 @@ play_next_chunk(player &player)
 	dc.Lock();
 	if (!dc.IsIdle() &&
 	    dc.pipe->GetSize() <= (pc.buffered_before_play +
-				   player.buffer.GetSize() * 3) / 4)
+				   buffer.GetSize() * 3) / 4)
 		dc.Signal();
 	dc.Unlock();
 
 	return true;
 }
 
-/**
+inline bool
- * This is called at the border between two songs: the audio output
+player::SongBorder()
- * has consumed all chunks of the current song, and we should start
- * sending chunks from the next one.
- *
- * The player lock is not held.
- *
- * @return true on success, false on error (playback will be stopped)
- */
-static bool
-player_song_border(player &player)
 {
-	player.xfade = XFADE_UNKNOWN;
+	xfade = XFADE_UNKNOWN;
 
-	char *uri = player.song->GetURI();
+	char *uri = song->GetURI();
 	g_message("played \"%s\"", uri);
 	g_free(uri);
 
-	delete player.pipe;
+	ReplacePipe(dc.pipe);
-	player.pipe = player.dc.pipe;
 
 	audio_output_all_song_border();
 
-	if (!player_wait_for_decoder(player))
+	if (!WaitForDecoder())
 		return false;
 
-	player_control &pc = player.pc;
 	pc.Lock();
 
 	const bool border_pause = pc.border_pause;
 	if (border_pause) {
-		player.paused = true;
+		paused = true;
 		pc.state = PLAYER_STATE_PAUSE;
 	}
 
@@ -898,28 +909,20 @@ player_song_border(player &player)
 	return true;
 }
 
-/*
+inline void
- * The main loop of the player thread, during playback.  This is
+player::Run()
- * basically a state machine, which multiplexes data between the
- * decoder thread and the output threads.
- */
-static void
-do_play(player_control &pc, decoder_control &dc,
-	MusicBuffer &buffer)
 {
-	player player(pc, dc, buffer);
-
 	pc.Unlock();
 
-	player.pipe = new MusicPipe();
+	pipe = new MusicPipe();
 
-	player_dc_start(player, *player.pipe);
+	StartDecoder(*pipe);
-	if (!player_wait_for_decoder(player)) {
+	if (!WaitForDecoder()) {
-		assert(player.song == NULL);
+		assert(song == NULL);
 
-		player_dc_stop(player);
+		StopDecoder();
 		player_command_finished(pc);
-		delete player.pipe;
+		delete pipe;
 		GlobalEvents::Emit(GlobalEvents::PLAYLIST);
 		pc.Lock();
 		return;
@@ -929,12 +932,12 @@ do_play(player_control &pc, decoder_control &dc,
 	pc.state = PLAYER_STATE_PLAY;
 
 	if (pc.command == PLAYER_COMMAND_SEEK)
-		player.elapsed_time = pc.seek_where;
+		elapsed_time = pc.seek_where;
 
 	player_command_finished_locked(pc);
 
 	while (true) {
-		player_process_command(player);
+		ProcessCommand();
 		if (pc.command == PLAYER_COMMAND_STOP ||
 		    pc.command == PLAYER_COMMAND_EXIT ||
 		    pc.command == PLAYER_COMMAND_CLOSE_AUDIO) {
@@ -945,19 +948,18 @@ do_play(player_control &pc, decoder_control &dc,
 
 		pc.Unlock();
 
-		if (player.buffering) {
+		if (buffering) {
 			/* buffering at the start of the song - wait
 			   until the buffer is large enough, to
 			   prevent stuttering on slow machines */
 
-			if (player.pipe->GetSize() < pc.buffered_before_play &&
+			if (pipe->GetSize() < pc.buffered_before_play &&
 			    !dc.LockIsIdle()) {
 				/* not enough decoded buffer space yet */
 
-				if (!player.paused &&
+				if (!paused && output_open &&
-				    player.output_open &&
 				    audio_output_all_check() < 4 &&
-				    !player_send_silence(player))
+				    !SendSilence())
 					break;
 
 				dc.Lock();
@@ -968,14 +970,14 @@ do_play(player_control &pc, decoder_control &dc,
 				continue;
 			} else {
 				/* buffering is complete */
-				player.buffering = false;
+				buffering = false;
 			}
 		}
 
-		if (player.decoder_starting) {
+		if (decoder_starting) {
 			/* wait until the decoder is initialized completely */
 
-			if (!player_check_decoder_startup(player))
+			if (!CheckDecoderStartup())
 				break;
 
 			pc.Lock();
@@ -985,31 +987,30 @@ do_play(player_control &pc, decoder_control &dc,
 #ifndef NDEBUG
 		/*
 		music_pipe_check_format(&play_audio_format,
-					player.next_song_chunk,
+					next_song_chunk,
 					&dc.out_audio_format);
 		*/
 #endif
 
-		if (dc.LockIsIdle() && player.queued &&
+		if (dc.LockIsIdle() && queued && dc.pipe == pipe) {
-		    dc.pipe == player.pipe) {
 			/* the decoder has finished the current song;
 			   make it decode the next song */
 
-			assert(dc.pipe == NULL || dc.pipe == player.pipe);
+			assert(dc.pipe == NULL || dc.pipe == pipe);
 
-			player_dc_start(player, *new MusicPipe());
+			StartDecoder(*new MusicPipe());
 		}
 
 		if (/* no cross-fading if MPD is going to pause at the
 		       end of the current song */
 		    !pc.border_pause &&
-		    player_dc_at_next_song(player) &&
+		    IsDecoderAtNextSong() &&
-		    player.xfade == XFADE_UNKNOWN &&
+		    xfade == XFADE_UNKNOWN &&
 		    !dc.LockIsStarting()) {
 			/* enable cross fading in this song?  if yes,
 			   calculate how many chunks will be required
 			   for it */
-			player.cross_fade_chunks =
+			cross_fade_chunks =
 				cross_fade_calc(pc.cross_fade_seconds, dc.total_time,
 						pc.mixramp_db,
 						pc.mixramp_delay_seconds,
@@ -1018,29 +1019,29 @@ do_play(player_control &pc, decoder_control &dc,
 						dc.mixramp_start,
 						dc.mixramp_prev_end,
 						dc.out_audio_format,
-						player.play_audio_format,
+						play_audio_format,
-						player.buffer.GetSize() -
+						buffer.GetSize() -
 						pc.buffered_before_play);
-			if (player.cross_fade_chunks > 0) {
+			if (cross_fade_chunks > 0) {
-				player.xfade = XFADE_ENABLED;
+				xfade = XFADE_ENABLED;
-				player.cross_fading = false;
+				cross_fading = false;
 			} else
 				/* cross fading is disabled or the
 				   next song is too short */
-				player.xfade = XFADE_DISABLED;
+				xfade = XFADE_DISABLED;
 		}
 
-		if (player.paused) {
+		if (paused) {
 			pc.Lock();
 
 			if (pc.command == PLAYER_COMMAND_NONE)
 				pc.Wait();
 			continue;
-		} else if (!player.pipe->IsEmpty()) {
+		} else if (!pipe->IsEmpty()) {
 			/* at least one music chunk is ready - send it
 			   to the audio output */
 
-			play_next_chunk(player);
+			PlayNextChunk();
 		} else if (audio_output_all_check() > 0) {
 			/* not enough data from decoder, but the
 			   output thread is still busy, so it's
@@ -1048,45 +1049,44 @@ do_play(player_control &pc, decoder_control &dc,
 
 			/* XXX synchronize in a better way */
 			g_usleep(10000);
-		} else if (player_dc_at_next_song(player)) {
+		} else if (IsDecoderAtNextSong()) {
 			/* at the beginning of a new song */
 
-			if (!player_song_border(player))
+			if (!SongBorder())
 				break;
 		} else if (dc.LockIsIdle()) {
 			/* check the size of the pipe again, because
 			   the decoder thread may have added something
 			   since we last checked */
-			if (player.pipe->IsEmpty()) {
+			if (pipe->IsEmpty()) {
 				/* wait for the hardware to finish
 				   playback */
 				audio_output_all_drain();
 				break;
 			}
-		} else if (player.output_open) {
+		} else if (output_open) {
 			/* the decoder is too busy and hasn't provided
 			   new PCM data in time: send silence (if the
 			   output pipe is empty) */
-			if (!player_send_silence(player))
+			if (!SendSilence())
 				break;
 		}
 
 		pc.Lock();
 	}
 
-	player_dc_stop(player);
+	StopDecoder();
 
-	player.pipe->Clear(player.buffer);
+	ClearAndDeletePipe();
-	delete player.pipe;
 
-	delete player.cross_fade_tag;
+	delete cross_fade_tag;
 
-	if (player.song != NULL)
+	if (song != nullptr)
-		player.song->Free();
+		song->Free();
 
 	pc.Lock();
 
-	if (player.queued) {
+	if (queued) {
 		assert(pc.next_song != NULL);
 		pc.next_song->Free();
 		pc.next_song = NULL;
@@ -1101,6 +1101,14 @@ do_play(player_control &pc, decoder_control &dc,
 	pc.Lock();
 }
 
+static void
+do_play(player_control &pc, decoder_control &dc,
+	MusicBuffer &buffer)
+{
+	player player(pc, dc, buffer);
+	player.Run();
+}
+
 static gpointer
 player_task(gpointer arg)
 {