player/Thread: remove obsolete `buffered_before_play` attribute

doc/user.rst

@@ -575,8 +575,6 @@ Do not change these unless you know what you are doing.
      - Description
    * - **audio_buffer_size KBYTES**
      - Adjust the size of the internal audio buffer. Default is 4096 (4 MiB).
-   * - **buffer_before_play PERCENT**
-     - Control the percentage of the buffer which is filled before beginning to play. Increasing this reduces the chance of audio file skipping, at the cost of increased time prior to audio playback. Default is 10%.
 
 Zeroconf
 ~~~~~~~~

src/Main.cxx

@@ -124,8 +124,6 @@ static constexpr
 size_t MIN_BUFFER_SIZE = std::max(CHUNK_SIZE * 32,
 				  64 * KILOBYTE);
 
-static constexpr unsigned DEFAULT_BUFFER_BEFORE_PLAY = 10;
-
 #ifdef ANDROID
 Context *context;
 LogListener *logListener;
@@ -305,37 +303,6 @@ initialize_decoder_and_player(const ConfigData &config,
 		throw FormatRuntimeError("buffer size \"%lu\" is too big",
 					 (unsigned long)buffer_size);
 
-	float perc;
-	param = config.GetParam(ConfigOption::BUFFER_BEFORE_PLAY);
-	if (param != nullptr) {
-		char *test;
-		perc = strtod(param->value.c_str(), &test);
-		if (*test != '%' || perc < 0 || perc > 100) {
-			throw FormatRuntimeError("buffered before play \"%s\" is not "
-						 "a positive percentage and less "
-						 "than 100 percent, line %i",
-						 param->value.c_str(), param->line);
-		}
-
-		if (perc > 80) {
-			/* this upper limit should avoid deadlocks
-			   which can occur because the DecoderThread
-			   cannot ever fill the music buffer to
-			   exactly 100%; a few chunks always need to
-			   be available to generate silence in
-			   Player::SendSilence() */
-			FormatError(config_domain,
-				    "buffer_before_play is too large (%f%%), capping at 80%%; please fix your configuration",
-				    perc);
-			perc = 80;
-		}
-	} else
-		perc = DEFAULT_BUFFER_BEFORE_PLAY;
-
-	unsigned buffered_before_play = (perc / 100) * buffered_chunks;
-	if (buffered_before_play > buffered_chunks)
-		buffered_before_play = buffered_chunks;
-
 	const unsigned max_length =
 		config.GetPositive(ConfigOption::MAX_PLAYLIST_LENGTH,
 				   DEFAULT_PLAYLIST_MAX_LENGTH);
@@ -356,7 +323,6 @@ initialize_decoder_and_player(const ConfigData &config,
 					  "default",
 					  max_length,
 					  buffered_chunks,
-					  buffered_before_play,
 					  configured_audio_format,
 					  replay_gain_config);
 	auto &partition = instance->partitions.back();

src/Partition.cxx

@@ -29,7 +29,6 @@ Partition::Partition(Instance &_instance,
 		     const char *_name,
 		     unsigned max_length,
 		     unsigned buffer_chunks,
-		     unsigned buffered_before_play,
 		     AudioFormat configured_audio_format,
 		     const ReplayGainConfig &replay_gain_config)
 	:instance(_instance),
@@ -38,7 +37,7 @@ Partition::Partition(Instance &_instance,
 	 global_events(instance.event_loop, BIND_THIS_METHOD(OnGlobalEvent)),
 	 playlist(max_length, *this),
 	 outputs(*this),
-	 pc(*this, outputs, buffer_chunks, buffered_before_play,
+	 pc(*this, outputs, buffer_chunks,
 	    configured_audio_format, replay_gain_config)
 {
 	UpdateEffectiveReplayGainMode();

src/Partition.hxx

@@ -69,7 +69,6 @@ struct Partition final : QueueListener, PlayerListener, MixerListener {
 		  const char *_name,
 		  unsigned max_length,
 		  unsigned buffer_chunks,
-		  unsigned buffered_before_play,
 		  AudioFormat configured_audio_format,
 		  const ReplayGainConfig &replay_gain_config);
 

src/command/PartitionCommands.cxx

@@ -102,7 +102,6 @@ handle_newpartition(Client &client, Request request, Response &response)
 					 // TODO: use real configuration
 					 16384,
 					 1024,
-					 128,
 					 AudioFormat::Undefined(),
 					 ReplayGainConfig());
 	auto &partition = instance.partitions.back();

src/player/Control.cxx

@@ -30,12 +30,10 @@
 PlayerControl::PlayerControl(PlayerListener &_listener,
 			     PlayerOutputs &_outputs,
 			     unsigned _buffer_chunks,
-			     unsigned _buffered_before_play,
 			     AudioFormat _configured_audio_format,
 			     const ReplayGainConfig &_replay_gain_config) noexcept
 	:listener(_listener), outputs(_outputs),
 	 buffer_chunks(_buffer_chunks),
-	 buffered_before_play(_buffered_before_play),
 	 configured_audio_format(_configured_audio_format),
 	 thread(BIND_THIS_METHOD(RunThread)),
 	 replay_gain_config(_replay_gain_config)

src/player/Control.hxx

@@ -118,8 +118,6 @@ class PlayerControl final : public AudioOutputClient {
 
 	const unsigned buffer_chunks;
 
-	const unsigned buffered_before_play;
-
 	/**
 	 * The "audio_output_format" setting.
 	 */
@@ -237,7 +235,6 @@ public:
 	PlayerControl(PlayerListener &_listener,
 		      PlayerOutputs &_outputs,
 		      unsigned buffer_chunks,
-		      unsigned buffered_before_play,
 		      AudioFormat _configured_audio_format,
 		      const ReplayGainConfig &_replay_gain_config) noexcept;
 	~PlayerControl() noexcept;