dolphin/Source/Core/AudioCommon/Src/PulseAudioStream.cpp

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// Copyright (C) 2003 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#include <functional>
#include "Common.h"
#include "Thread.h"
#include "PulseAudioStream.h"
#define BUFFER_SIZE 4096
#define BUFFER_SIZE_BYTES (BUFFER_SIZE * 4)
PulseAudio::PulseAudio(CMixer *mixer)
: SoundStream(mixer), thread_running(false), mainloop(NULL)
, context(NULL), stream(NULL), iVolume(100)
{
mix_buffer = new u8[BUFFER_SIZE_BYTES];
}
PulseAudio::~PulseAudio()
{
delete [] mix_buffer;
}
bool PulseAudio::Start()
{
thread_running = true;
thread = std::thread(std::mem_fun(&PulseAudio::SoundLoop), this);
return true;
}
void PulseAudio::Stop()
{
thread_running = false;
thread.join();
}
void PulseAudio::Update()
{
// don't need to do anything here.
}
// Called on audio thread.
void PulseAudio::SoundLoop()
{
thread_running = PulseInit();
while (thread_running)
{
int frames_to_deliver = 512;
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();
}
bool PulseAudio::PulseInit()
{
// The Sample format to use
static const pa_sample_spec ss = {
PA_SAMPLE_S16LE,
m_mixer->GetSampleRate(),
2
};
mainloop = pa_threaded_mainloop_new();
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 failed to connect context: %s",
pa_strerror(pa_context_errno(context)));
return false;
}
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 (mainloop)
pa_threaded_mainloop_stop(mainloop);
if (stream)
pa_stream_unref(stream);
if (context)
{
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);
}