Add volume control for the pulse audio backend. Unfortunately that can not be done with the pulse-simple api, so I had to switch to the asynchronous pulse api.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6104 8ced0084-cf51-0410-be5f-012b33b47a6e
2025-07-21 05:09:34 -06:00 · 2010-08-17 02:14:04 +00:00
parent fb1c14e2cc
commit 7866fade02
6 changed files with 289 additions and 68 deletions
--- a/Source/Core/AudioCommon/Src/PulseAudioStream.cpp
+++ b/Source/Core/AudioCommon/Src/PulseAudioStream.cpp
@ -21,9 +21,11 @@
 #include "PulseAudioStream.h"

 #define BUFFER_SIZE 4096
-#define BUFFER_SIZE_BYTES (BUFFER_SIZE*2*2)
+#define BUFFER_SIZE_BYTES (BUFFER_SIZE * 4)

-PulseAudio::PulseAudio(CMixer *mixer) : SoundStream(mixer), thread_data(0), handle(NULL)
+PulseAudio::PulseAudio(CMixer *mixer)
+	: SoundStream(mixer), thread_running(false), mainloop(NULL)
+	, context(NULL), stream(NULL), iVolume(100)
 {
 	mix_buffer = new u8[BUFFER_SIZE_BYTES];
 }
@ -33,22 +35,22 @@ PulseAudio::~PulseAudio()
 	delete [] mix_buffer;
 }

-static void *ThreadTrampoline(void *args)
+void *PulseAudio::ThreadTrampoline(void *args)
 {
-	reinterpret_cast<PulseAudio *>(args)->SoundLoop();
+	((PulseAudio *)args)->SoundLoop();
 	return NULL;
 }

 bool PulseAudio::Start()
 {
+	thread_running = true;
 	thread = new Common::Thread(&ThreadTrampoline, this);
-	thread_data = 0;
 	return true;
 }

 void PulseAudio::Stop()
 {
-	thread_data = 1;
+	thread_running = false;
 	delete thread;
 	thread = NULL;
 }
@ -61,22 +63,16 @@ void PulseAudio::Update()
 // Called on audio thread.
 void PulseAudio::SoundLoop()
 {
-	if (!PulseInit()) {
-		thread_data = 2;
-		return;
-	}
-	while (!thread_data)
+	thread_running = PulseInit();
+
+	while (thread_running)
 	{
-		int err;
 		int frames_to_deliver = 512;
-		m_mixer->Mix(reinterpret_cast<short *>(mix_buffer), frames_to_deliver);
-		if (pa_simple_write(handle, mix_buffer, frames_to_deliver * 2 * 2, &err) < 0)
-		{
-			ERROR_LOG(AUDIO, "pa_simple_write fail: %s", pa_strerror(err));
-		}
+		m_mixer->Mix((short *)mix_buffer, frames_to_deliver);
+		if (!Write(mix_buffer, frames_to_deliver * 4))
+			ERROR_LOG(AUDIO, "PulseAudio failure writing data");
 	}
 	PulseShutdown();
-	thread_data = 2;
 }

 bool PulseAudio::PulseInit()
@ -88,25 +84,238 @@ bool PulseAudio::PulseInit()
 		2
 	};

-	int err;
+	mainloop = pa_threaded_mainloop_new();

-	if (!(handle = pa_simple_new(NULL, "dolphin-emu", PA_STREAM_PLAYBACK, NULL,
-					"emulator", &ss, NULL, NULL, &err)))
+	context = pa_context_new(pa_threaded_mainloop_get_api(mainloop), "dolphin-emu");
+	pa_context_set_state_callback(context, ContextStateCB, this);
+
+	if (pa_context_connect(context, NULL, PA_CONTEXT_NOFLAGS, NULL) < 0)
 	{
-		ERROR_LOG(AUDIO, "PulseAudio open error: %s\n", pa_strerror(err));
+		ERROR_LOG(AUDIO, "PulseAudio failed to connect context: %s",
+				pa_strerror(pa_context_errno(context)));
 		return false;
 	}

-	NOTICE_LOG(AUDIO, "Pulse successfully initialized.\n");
+	pa_threaded_mainloop_lock(mainloop);
+	pa_threaded_mainloop_start(mainloop);
+
+	for (;;)
+	{
+		pa_context_state_t state;
+
+		state = pa_context_get_state(context);
+
+		if (state == PA_CONTEXT_READY)
+			break;
+
+		if (!PA_CONTEXT_IS_GOOD(state))
+		{
+			ERROR_LOG(AUDIO, "PulseAudio context state failure: %s",
+					pa_strerror(pa_context_errno(context)));
+			pa_threaded_mainloop_unlock(mainloop);
+			return false;
+		}
+
+		// Wait until the context is ready
+		pa_threaded_mainloop_wait(mainloop);
+	}
+
+	if (!(stream = pa_stream_new(context, "emulator", &ss, NULL)))
+	{
+		ERROR_LOG(AUDIO, "PulseAudio failed to create playback stream: %s",
+				pa_strerror(pa_context_errno(context)));
+		pa_threaded_mainloop_unlock(mainloop);
+		return false;
+	}
+
+	// Set callbacks for the playback stream
+	pa_stream_set_state_callback(stream, StreamStateCB, this);
+	pa_stream_set_write_callback(stream, StreamWriteCB, this);
+
+	if (pa_stream_connect_playback(stream, NULL, NULL, PA_STREAM_NOFLAGS, NULL, NULL) < 0)
+	{
+		ERROR_LOG(AUDIO, "PulseAudio failed to connect playback stream: %s",
+				pa_strerror(pa_context_errno(context)));
+		pa_threaded_mainloop_unlock(mainloop);
+		return false;
+	}
+
+	for (;;)
+	{
+		pa_stream_state_t state;
+
+		state = pa_stream_get_state(stream);
+
+		if (state == PA_STREAM_READY)
+			break;
+
+		if (!PA_STREAM_IS_GOOD(state))
+		{
+			ERROR_LOG(AUDIO, "PulseAudio stream state failure: %s",
+					pa_strerror(pa_context_errno(context)));
+			pa_threaded_mainloop_unlock(mainloop);
+			return false;
+		}
+
+		// Wait until the stream is ready
+		pa_threaded_mainloop_wait(mainloop);
+	}
+
+	pa_threaded_mainloop_unlock(mainloop);
+
+	SetVolume(iVolume);
+
+	NOTICE_LOG(AUDIO, "Pulse successfully initialized.");
 	return true;
 }

 void PulseAudio::PulseShutdown()
 {
-	if (handle != NULL)
+	if (mainloop)
+		pa_threaded_mainloop_stop(mainloop);
+
+	if (stream)
+		pa_stream_unref(stream);
+
+	if (context)
 	{
-		pa_simple_free(handle);
-		handle = NULL;
+		pa_context_disconnect(context);
+		pa_context_unref(context);
+	}
+
+	if (mainloop)
+		pa_threaded_mainloop_free(mainloop);
+}
+
+void PulseAudio::SignalMainLoop()
+{
+	pa_threaded_mainloop_signal(mainloop, 0);
+}
+
+void PulseAudio::ContextStateCB(pa_context *c, void *userdata)
+{
+	switch (pa_context_get_state(c))
+	{
+		case PA_CONTEXT_READY:
+		case PA_CONTEXT_TERMINATED:
+		case PA_CONTEXT_FAILED:
+			((PulseAudio *)userdata)->SignalMainLoop();
+			break;
+
+		default:
+			break;
 	}
 }

+void PulseAudio::StreamStateCB(pa_stream *s, void * userdata)
+{
+	switch (pa_stream_get_state(s))
+	{
+		case PA_STREAM_READY:
+		case PA_STREAM_TERMINATED:
+		case PA_STREAM_FAILED:
+			((PulseAudio *)userdata)->SignalMainLoop();
+			break;
+
+		default:
+			break;
+	}
+}
+
+void PulseAudio::StreamWriteCB(pa_stream *s, size_t length, void *userdata)
+{
+	((PulseAudio *)userdata)->SignalMainLoop();
+}
+
+static bool StateIsGood(pa_context *context, pa_stream *stream)
+{
+	if (!context || !PA_CONTEXT_IS_GOOD(pa_context_get_state(context)) ||
+			!stream || !PA_STREAM_IS_GOOD(pa_stream_get_state(stream)))
+	{
+		if ((context && pa_context_get_state(context) == PA_CONTEXT_FAILED) ||
+				(stream && pa_stream_get_state(stream) == PA_STREAM_FAILED))
+		{
+			ERROR_LOG(AUDIO, "PulseAudio state failure: %s",
+					pa_strerror(pa_context_errno(context)));
+		}
+		else
+		{
+			ERROR_LOG(AUDIO, "PulseAudio state failure: %s",
+					pa_strerror(PA_ERR_BADSTATE));
+		}
+		return false;
+	}
+	return true;
+}
+
+bool PulseAudio::Write(const void *data, size_t length)
+{
+	if (!data || length == 0 || !stream)
+		return false;
+
+	pa_threaded_mainloop_lock(mainloop);
+
+	if (!StateIsGood(context, stream))
+	{
+		pa_threaded_mainloop_unlock(mainloop);
+		return false;
+	}
+
+	while (length > 0)
+	{
+		size_t l;
+		int r;
+
+		while (!(l = pa_stream_writable_size(stream)))
+		{
+			pa_threaded_mainloop_wait(mainloop);
+			if (!StateIsGood(context, stream))
+			{
+				pa_threaded_mainloop_unlock(mainloop);
+				return false;
+			}
+		}
+
+		if (l == (size_t)-1)
+		{
+			ERROR_LOG(AUDIO, "PulseAudio invalid stream:  %s",
+					pa_strerror(pa_context_errno(context)));
+			pa_threaded_mainloop_unlock(mainloop);
+			return false;
+		}
+
+		if (l > length)
+			l = length;
+
+		r = pa_stream_write(stream, data, l, NULL, 0LL, PA_SEEK_RELATIVE);
+		if (r < 0)
+		{
+			ERROR_LOG(AUDIO, "PulseAudio error writing to stream:  %s",
+					pa_strerror(pa_context_errno(context)));
+			pa_threaded_mainloop_unlock(mainloop);
+			return false;
+		}
+
+		data = (const uint8_t*) data + l;
+		length -= l;
+	}
+
+	pa_threaded_mainloop_unlock(mainloop);
+	return true;
+}
+
+void PulseAudio::SetVolume(int volume)
+{
+	iVolume = volume;
+
+	if (!stream)
+		return;
+
+	pa_cvolume cvolume;
+	const pa_channel_map *channels = pa_stream_get_channel_map(stream);
+	pa_cvolume_set(&cvolume, channels->channels,
+			iVolume * (PA_VOLUME_NORM - PA_VOLUME_MUTED) / 100);
+
+	pa_context_set_sink_input_volume(context, pa_stream_get_index(stream),
+			&cvolume, NULL, this);
+}