Added a PulseAudio output plugin for Linux.

CMakeLists.txt

@@ -87,6 +87,7 @@ add_dependencies(taglibreader taglib)
 
 if (CMAKE_SYSTEM_NAME MATCHES "Linux")
   add_subdirectory(src/contrib/alsaout)
+  add_subdirectory(src/contrib/pulseout)
 else (CMAKE_SYSTEM_NAME MATCHES "Linux")
   # macos
   add_subdirectory(src/contrib/coreaudioout)
@@ -107,6 +108,7 @@ if (CMAKE_SYSTEM_NAME MATCHES "Linux")
   install(
     FILES
       bin/plugins/libalsaout.so
+      bin/plugins/libpulseout.so
       bin/plugins/libflacdecoder.so
       bin/plugins/libm4adecoder.so
       bin/plugins/libmpg123decoder.so

src/contrib/pulseout/CMakeLists.txt

@@ -0,0 +1,12 @@
+set (pulseout_SOURCES
+  pulseout_plugin.cpp
+  pulse_blocking_stream.c
+  PulseOut.cpp
+)
+
+add_definitions( 
+  -D_DEBUG
+)
+
+add_library( pulseout SHARED ${pulseout_SOURCES} )
+target_link_libraries( pulseout ${musikbox_LINK_LIBS} pulse)

src/contrib/pulseout/PulseOut.cpp

@@ -0,0 +1,183 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2007-2016 musikcube team
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//    * Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+//
+//    * Redistributions in binary form must reproduce the above copyright
+//      notice, this list of conditions and the following disclaimer in the
+//      documentation and/or other materials provided with the distribution.
+//
+//    * Neither the name of the author nor the names of other contributors may
+//      be used to endorse or promote products derived from this software
+//      without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#include "PulseOut.h"
+#include <pulse/volume.h>
+#include <math.h>
+
+using namespace musik::core::sdk;
+
+typedef std::unique_lock<std::recursive_mutex> Lock;
+
+PulseOut::PulseOut() {
+    std::cerr << "PulseOut::PulseOut() called" << std::endl;
+    this->audioConnection = nullptr;
+    this->state = StateStopped;
+    this->volume = 1.0f;
+    this->channels = 0;
+    this->rate = 0;
+}
+
+PulseOut::~PulseOut() {
+    std::cerr << "PulseOut: destructor\n";
+    this->CloseDevice();
+}
+
+void PulseOut::CloseDevice() {
+    std::cerr << "PulseOut: closing device\n";
+
+    Lock lock(this->stateMutex);
+    if (this->audioConnection) {
+        int error = 0;
+        pa_blocking_flush(this->audioConnection, &error);
+        pa_blocking_free(this->audioConnection);
+        this->audioConnection = nullptr;
+        this->rate = 0;
+        this->channels = 0;
+    }
+}
+
+void PulseOut::OpenDevice(musik::core::sdk::IBuffer* buffer) {
+    
+    if (!this->audioConnection ||
+        this->rate != buffer->SampleRate() ||
+        this->channels != buffer->Channels())
+    {
+        this->CloseDevice();
+
+        pa_sample_spec spec;
+        spec.format = PA_SAMPLE_FLOAT32LE;
+        spec.channels = buffer->Channels();
+        spec.rate = buffer->SampleRate();
+
+        std::cerr << "PulseOut: opening device\n";
+        this->audioConnection = pa_blocking_new(
+            nullptr,
+            "musikbox",
+            PA_STREAM_PLAYBACK,
+            nullptr,
+            "music",
+            &spec,
+            nullptr,
+            nullptr,
+            0);
+
+        if (this->audioConnection) {
+            this->SetVolume(this->volume);
+            this->rate = buffer->SampleRate();
+            this->channels = buffer->Channels();
+            this->state = StatePlaying;
+        }
+    }
+}
+
+void PulseOut::Destroy() {
+    std::cerr << "PulseOut: destroy\n";
+    delete this;
+}
+
+void PulseOut::Stop() {
+    std::cerr << "PulseOut: stop\n";
+
+    Lock lock(this->stateMutex);
+    if (this->audioConnection) {
+        pa_blocking_flush(this->audioConnection, 0);
+        this->state = StateStopped;
+    }
+}
+
+void PulseOut::Pause() {
+    std::cerr << "PulseOut: pause\n";
+
+    Lock lock(this->stateMutex);
+    if (this->audioConnection) {
+        pa_blocking_flush(this->audioConnection, 0);
+        this->state = StatePaused;
+    }
+}
+
+void PulseOut::Resume() {
+    std::cerr << "PulseOut: resume\n";
+    
+    Lock lock(this->stateMutex);
+    if (this->audioConnection) {
+        this->state = StatePlaying;
+    }
+}
+
+void PulseOut::SetVolume(double volume) {
+    std::cerr << "PulseOut: volume\n";
+
+    Lock lock(this->stateMutex);
+    if (this->audioConnection) {
+        this->volume = volume;
+        int normalized =  (int) round((double) PA_VOLUME_NORM * volume);
+        pa_blocking_set_volume(this->audioConnection, normalized, 0);
+    }
+}
+
+bool PulseOut::Play(IBuffer *buffer, IBufferProvider* provider) {
+    int error = 0;
+
+    {
+        Lock lock(this->stateMutex);
+
+        this->OpenDevice(buffer);
+
+        if (!this->audioConnection || this->state != StatePlaying) {
+            return false;
+        }
+
+        pa_blocking_write(
+            this->audioConnection,
+            buffer->BufferPointer(),
+            buffer->Samples() * sizeof(float),
+            &error);
+    }
+
+    provider->OnBufferProcessed(buffer);
+    return true;
+}
+
+double PulseOut::Latency() {
+    Lock lock(this->stateMutex);
+    
+    if (!this->audioConnection) {
+        return 0.0;
+    }
+
+    int error = 0;
+    unsigned long long latency = pa_blocking_get_latency(this->audioConnection, &error);
+    return (double) latency / 1000000.0; /* microseconds to seconds */
+}

src/contrib/pulseout/PulseOut.h

@@ -0,0 +1,73 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2007-2016 musikcube team
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//    * Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+//
+//    * Redistributions in binary form must reproduce the above copyright
+//      notice, this list of conditions and the following disclaimer in the
+//      documentation and/or other materials provided with the distribution.
+//
+//    * Neither the name of the author nor the names of other contributors may
+//      be used to endorse or promote products derived from this software
+//      without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//////////////////////////////////////////////////////////////////////////////
+#pragma once
+
+#include "pch.h"
+
+#include <core/sdk/IOutput.h>
+#include <mutex>
+#include "pulse_blocking_stream.h"
+
+class PulseOut : public musik::core::sdk::IOutput {
+    public:
+        PulseOut();
+        virtual ~PulseOut();
+
+        virtual void Destroy();
+        virtual void Pause();
+        virtual void Resume();
+        virtual void SetVolume(double volume);
+        virtual void Stop();
+        virtual double Latency();
+
+        virtual bool Play(
+            musik::core::sdk::IBuffer *buffer,
+            musik::core::sdk::IBufferProvider *provider);
+
+    private:
+        enum State {
+            StateStopped,
+            StatePaused,
+            StatePlaying
+        };
+
+        void OpenDevice(musik::core::sdk::IBuffer *buffer);
+        void CloseDevice();
+
+        std::recursive_mutex stateMutex;
+        pa_blocking* audioConnection;
+        State state;
+        int channels, rate;
+        double volume;
+};

src/contrib/pulseout/pch.h

@@ -0,0 +1,41 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2007-2016 musikcube team
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//    * Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+//
+//    * Redistributions in binary form must reproduce the above copyright
+//      notice, this list of conditions and the following disclaimer in the
+//      documentation and/or other materials provided with the distribution.
+//
+//    * Neither the name of the author nor the names of other contributors may
+//      be used to endorse or promote products derived from this software
+//      without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+// Precompiled headers
+#pragma once
+
+#include <core/config.h>
+#include <iostream>
+
+#include <alsa/asoundlib.h>

src/contrib/pulseout/pulse_blocking_stream.c

@@ -0,0 +1,553 @@
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio 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 for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include <pulse/pulseaudio.h>
+#include <pulse/thread-mainloop.h>
+#include <pulse/xmalloc.h>
+
+#include "pulse_blocking_stream.h"
+
+struct pa_blocking {
+    pa_threaded_mainloop *mainloop;
+    pa_context *context;
+    pa_stream *stream;
+    pa_stream_direction_t direction;
+
+    const void *read_data;
+    size_t read_index, read_length;
+    size_t channels;
+
+    int operation_success;
+};
+
+#define CHECK_VALIDITY_RETURN_ANY(rerror, expression, error, ret)       \
+    do {                                                                \
+        if (!(expression)) {                                            \
+            if (rerror)                                                 \
+                *(rerror) = error;                                      \
+            return (ret);                                               \
+        }                                                               \
+    } while(false);
+
+#define CHECK_SUCCESS_GOTO(p, rerror, expression, label)        \
+    do {                                                        \
+        if (!(expression)) {                                    \
+            if (rerror)                                         \
+                *(rerror) = pa_context_errno((p)->context);     \
+            goto label;                                         \
+        }                                                       \
+    } while(false);
+
+#define CHECK_DEAD_GOTO(p, rerror, label)                               \
+    do {                                                                \
+        if (!(p)->context || !PA_CONTEXT_IS_GOOD(pa_context_get_state((p)->context)) || \
+            !(p)->stream || !PA_STREAM_IS_GOOD(pa_stream_get_state((p)->stream))) { \
+            if (((p)->context && pa_context_get_state((p)->context) == PA_CONTEXT_FAILED) || \
+                ((p)->stream && pa_stream_get_state((p)->stream) == PA_STREAM_FAILED)) { \
+                if (rerror)                                             \
+                    *(rerror) = pa_context_errno((p)->context);         \
+            } else                                                      \
+                if (rerror)                                             \
+                    *(rerror) = PA_ERR_BADSTATE;                        \
+            goto label;                                                 \
+        }                                                               \
+    } while(false);
+
+static void context_state_cb(pa_context *c, void *userdata) {
+    pa_blocking *p = userdata;
+    assert(c);
+    assert(p);
+
+    switch (pa_context_get_state(c)) {
+        case PA_CONTEXT_READY:
+        case PA_CONTEXT_TERMINATED:
+        case PA_CONTEXT_FAILED:
+            pa_threaded_mainloop_signal(p->mainloop, 0);
+            break;
+
+        case PA_CONTEXT_UNCONNECTED:
+        case PA_CONTEXT_CONNECTING:
+        case PA_CONTEXT_AUTHORIZING:
+        case PA_CONTEXT_SETTING_NAME:
+            break;
+    }
+}
+
+static void success_context_cb(pa_context *c, int success, void *userdata) {
+    pa_blocking *p = userdata;
+    assert(c);
+    assert(p);
+
+    p->operation_success = success;
+    pa_threaded_mainloop_signal(p->mainloop, 0);
+}
+
+static void stream_state_cb(pa_stream *s, void * userdata) {
+    pa_blocking *p = userdata;
+    assert(s);
+    assert(p);
+
+    switch (pa_stream_get_state(s)) {
+
+        case PA_STREAM_READY:
+        case PA_STREAM_FAILED:
+        case PA_STREAM_TERMINATED:
+            pa_threaded_mainloop_signal(p->mainloop, 0);
+            break;
+
+        case PA_STREAM_UNCONNECTED:
+        case PA_STREAM_CREATING:
+            break;
+    }
+}
+
+static void stream_request_cb(pa_stream *s, size_t length, void *userdata) {
+    pa_blocking *p = userdata;
+    assert(p);
+
+    pa_threaded_mainloop_signal(p->mainloop, 0);
+}
+
+static void stream_latency_update_cb(pa_stream *s, void *userdata) {
+    pa_blocking *p = userdata;
+
+    assert(p);
+
+    pa_threaded_mainloop_signal(p->mainloop, 0);
+}
+
+pa_blocking* pa_blocking_new(
+        const char *server,
+        const char *name,
+        pa_stream_direction_t dir,
+        const char *dev,
+        const char *stream_name,
+        const pa_sample_spec *ss,
+        const pa_channel_map *map,
+        const pa_buffer_attr *attr,
+        int *rerror) {
+
+    pa_blocking *p;
+    int error = PA_ERR_INTERNAL, r;
+
+    CHECK_VALIDITY_RETURN_ANY(rerror, !server || *server, PA_ERR_INVALID, NULL);
+    CHECK_VALIDITY_RETURN_ANY(rerror, dir == PA_STREAM_PLAYBACK || dir == PA_STREAM_RECORD, PA_ERR_INVALID, NULL);
+    CHECK_VALIDITY_RETURN_ANY(rerror, !dev || *dev, PA_ERR_INVALID, NULL);
+    CHECK_VALIDITY_RETURN_ANY(rerror, ss && pa_sample_spec_valid(ss), PA_ERR_INVALID, NULL);
+    CHECK_VALIDITY_RETURN_ANY(rerror, !map || (pa_channel_map_valid(map) && map->channels == ss->channels), PA_ERR_INVALID, NULL)
+
+    p = pa_xnew0(pa_blocking, 1);
+    p->direction = dir;
+    p->channels = ss->channels;
+
+    if (!(p->mainloop = pa_threaded_mainloop_new()))
+        goto fail;
+
+    if (!(p->context = pa_context_new(pa_threaded_mainloop_get_api(p->mainloop), name)))
+        goto fail;
+
+    pa_context_set_state_callback(p->context, context_state_cb, p);
+
+    if (pa_context_connect(p->context, server, 0, NULL) < 0) {
+        error = pa_context_errno(p->context);
+        goto fail;
+    }
+
+    pa_threaded_mainloop_lock(p->mainloop);
+
+    if (pa_threaded_mainloop_start(p->mainloop) < 0)
+        goto unlock_and_fail;
+
+    for (;;) {
+        pa_context_state_t state;
+
+        state = pa_context_get_state(p->context);
+
+        if (state == PA_CONTEXT_READY)
+            break;
+
+        if (!PA_CONTEXT_IS_GOOD(state)) {
+            error = pa_context_errno(p->context);
+            goto unlock_and_fail;
+        }
+
+        /* Wait until the context is ready */
+        pa_threaded_mainloop_wait(p->mainloop);
+    }
+
+    if (!(p->stream = pa_stream_new(p->context, stream_name, ss, map))) {
+        error = pa_context_errno(p->context);
+        goto unlock_and_fail;
+    }
+
+    pa_stream_set_state_callback(p->stream, stream_state_cb, p);
+    pa_stream_set_read_callback(p->stream, stream_request_cb, p);
+    pa_stream_set_write_callback(p->stream, stream_request_cb, p);
+    pa_stream_set_latency_update_callback(p->stream, stream_latency_update_cb, p);
+
+    if (dir == PA_STREAM_PLAYBACK)
+        r = pa_stream_connect_playback(p->stream, dev, attr,
+                                       PA_STREAM_INTERPOLATE_TIMING
+                                       |PA_STREAM_ADJUST_LATENCY
+                                       |PA_STREAM_AUTO_TIMING_UPDATE, NULL, NULL);
+    else
+        r = pa_stream_connect_record(p->stream, dev, attr,
+                                     PA_STREAM_INTERPOLATE_TIMING
+                                     |PA_STREAM_ADJUST_LATENCY
+                                     |PA_STREAM_AUTO_TIMING_UPDATE);
+
+    if (r < 0) {
+        error = pa_context_errno(p->context);
+        goto unlock_and_fail;
+    }
+
+    for (;;) {
+        pa_stream_state_t state;
+
+        state = pa_stream_get_state(p->stream);
+
+        if (state == PA_STREAM_READY)
+            break;
+
+        if (!PA_STREAM_IS_GOOD(state)) {
+            error = pa_context_errno(p->context);
+            goto unlock_and_fail;
+        }
+
+        /* Wait until the stream is ready */
+        pa_threaded_mainloop_wait(p->mainloop);
+    }
+
+    pa_threaded_mainloop_unlock(p->mainloop);
+
+    return p;
+
+unlock_and_fail:
+    pa_threaded_mainloop_unlock(p->mainloop);
+
+fail:
+    if (rerror)
+        *rerror = error;
+    pa_blocking_free(p);
+    return NULL;
+}
+
+void pa_blocking_free(pa_blocking *s) {
+    assert(s);
+
+    if (s->mainloop)
+        pa_threaded_mainloop_stop(s->mainloop);
+
+    if (s->stream)
+        pa_stream_unref(s->stream);
+
+    if (s->context) {
+        pa_context_disconnect(s->context);
+        pa_context_unref(s->context);
+    }
+
+    if (s->mainloop)
+        pa_threaded_mainloop_free(s->mainloop);
+
+    pa_xfree(s);
+}
+
+int pa_blocking_write(pa_blocking *p, const void*data, size_t length, int *rerror) {
+    assert(p);
+
+    CHECK_VALIDITY_RETURN_ANY(rerror, p->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE, -1);
+    CHECK_VALIDITY_RETURN_ANY(rerror, data, PA_ERR_INVALID, -1);
+    CHECK_VALIDITY_RETURN_ANY(rerror, length > 0, PA_ERR_INVALID, -1);
+
+    pa_threaded_mainloop_lock(p->mainloop);
+
+    CHECK_DEAD_GOTO(p, rerror, unlock_and_fail);
+
+    while (length > 0) {
+        size_t l;
+        int r;
+
+        while (!(l = pa_stream_writable_size(p->stream))) {
+            pa_threaded_mainloop_wait(p->mainloop);
+            CHECK_DEAD_GOTO(p, rerror, unlock_and_fail);
+        }
+
+        CHECK_SUCCESS_GOTO(p, rerror, l != (size_t) -1, unlock_and_fail);
+
+        if (l > length)
+            l = length;
+
+        r = pa_stream_write(p->stream, data, l, NULL, 0LL, PA_SEEK_RELATIVE);
+        CHECK_SUCCESS_GOTO(p, rerror, r >= 0, unlock_and_fail);
+
+        data = (const uint8_t*) data + l;
+        length -= l;
+    }
+
+    pa_threaded_mainloop_unlock(p->mainloop);
+    return 0;
+
+unlock_and_fail:
+    pa_threaded_mainloop_unlock(p->mainloop);
+    return -1;
+}
+
+int pa_blocking_read(pa_blocking *p, void*data, size_t length, int *rerror) {
+    assert(p);
+
+    CHECK_VALIDITY_RETURN_ANY(rerror, p->direction == PA_STREAM_RECORD, PA_ERR_BADSTATE, -1);
+    CHECK_VALIDITY_RETURN_ANY(rerror, data, PA_ERR_INVALID, -1);
+    CHECK_VALIDITY_RETURN_ANY(rerror, length > 0, PA_ERR_INVALID, -1);
+
+    pa_threaded_mainloop_lock(p->mainloop);
+
+    CHECK_DEAD_GOTO(p, rerror, unlock_and_fail);
+
+    while (length > 0) {
+        size_t l;
+
+        while (!p->read_data) {
+            int r;
+
+            r = pa_stream_peek(p->stream, &p->read_data, &p->read_length);
+            CHECK_SUCCESS_GOTO(p, rerror, r == 0, unlock_and_fail);
+
+            if (p->read_length <= 0) {
+                pa_threaded_mainloop_wait(p->mainloop);
+                CHECK_DEAD_GOTO(p, rerror, unlock_and_fail);
+            } else if (!p->read_data) {
+                /* There's a hole in the stream, skip it. We could generate
+                 * silence, but that wouldn't work for compressed streams. */
+                r = pa_stream_drop(p->stream);
+                CHECK_SUCCESS_GOTO(p, rerror, r == 0, unlock_and_fail);
+            } else
+                p->read_index = 0;
+        }
+
+        l = p->read_length < length ? p->read_length : length;
+        memcpy(data, (const uint8_t*) p->read_data+p->read_index, l);
+
+        data = (uint8_t*) data + l;
+        length -= l;
+
+        p->read_index += l;
+        p->read_length -= l;
+
+        if (!p->read_length) {
+            int r;
+
+            r = pa_stream_drop(p->stream);
+            p->read_data = NULL;
+            p->read_length = 0;
+            p->read_index = 0;
+
+            CHECK_SUCCESS_GOTO(p, rerror, r == 0, unlock_and_fail);
+        }
+    }
+
+    pa_threaded_mainloop_unlock(p->mainloop);
+    return 0;
+
+unlock_and_fail:
+    pa_threaded_mainloop_unlock(p->mainloop);
+    return -1;
+}
+
+static void success_cb(pa_stream *s, int success, void *userdata) {
+    pa_blocking *p = userdata;
+
+    assert(s);
+    assert(p);
+
+    p->operation_success = success;
+    pa_threaded_mainloop_signal(p->mainloop, 0);
+}
+
+int pa_blocking_drain(pa_blocking *p, int *rerror) {
+    pa_operation *o = NULL;
+
+    assert(p);
+
+    CHECK_VALIDITY_RETURN_ANY(rerror, p->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE, -1);
+
+    pa_threaded_mainloop_lock(p->mainloop);
+    CHECK_DEAD_GOTO(p, rerror, unlock_and_fail);
+
+    o = pa_stream_drain(p->stream, success_cb, p);
+    CHECK_SUCCESS_GOTO(p, rerror, o, unlock_and_fail);
+
+    p->operation_success = 0;
+    while (pa_operation_get_state(o) == PA_OPERATION_RUNNING) {
+        pa_threaded_mainloop_wait(p->mainloop);
+        CHECK_DEAD_GOTO(p, rerror, unlock_and_fail);
+    }
+    CHECK_SUCCESS_GOTO(p, rerror, p->operation_success, unlock_and_fail);
+
+    pa_operation_unref(o);
+    pa_threaded_mainloop_unlock(p->mainloop);
+
+    return 0;
+
+unlock_and_fail:
+
+    if (o) {
+        pa_operation_cancel(o);
+        pa_operation_unref(o);
+    }
+
+    pa_threaded_mainloop_unlock(p->mainloop);
+    return -1;
+}
+
+int pa_blocking_flush(pa_blocking *p, int *rerror) {
+    pa_operation *o = NULL;
+
+    assert(p);
+
+    pa_threaded_mainloop_lock(p->mainloop);
+    CHECK_DEAD_GOTO(p, rerror, unlock_and_fail);
+
+    o = pa_stream_flush(p->stream, success_cb, p);
+    CHECK_SUCCESS_GOTO(p, rerror, o, unlock_and_fail);
+
+    p->operation_success = 0;
+    while (pa_operation_get_state(o) == PA_OPERATION_RUNNING) {
+        pa_threaded_mainloop_wait(p->mainloop);
+        CHECK_DEAD_GOTO(p, rerror, unlock_and_fail);
+    }
+    CHECK_SUCCESS_GOTO(p, rerror, p->operation_success, unlock_and_fail);
+
+    pa_operation_unref(o);
+    pa_threaded_mainloop_unlock(p->mainloop);
+
+    return 0;
+
+unlock_and_fail:
+
+    if (o) {
+        pa_operation_cancel(o);
+        pa_operation_unref(o);
+    }
+
+    pa_threaded_mainloop_unlock(p->mainloop);
+    return -1;
+}
+
+pa_usec_t pa_blocking_get_latency(pa_blocking *p, int *rerror) {
+    pa_usec_t t;
+
+    assert(p);
+
+    pa_threaded_mainloop_lock(p->mainloop);
+
+    for (;;) {
+        int negative;
+
+        CHECK_DEAD_GOTO(p, rerror, unlock_and_fail);
+
+        if (pa_stream_get_latency(p->stream, &t, &negative) >= 0) {
+            pa_usec_t extra = 0;
+
+            if (p->direction == PA_STREAM_RECORD)
+                extra = pa_bytes_to_usec(p->read_length, pa_stream_get_sample_spec(p->stream));
+
+            if (negative) {
+                if (extra > t)
+                    t = extra - t;
+                else
+                    t = 0;
+            } else
+                t += extra;
+
+            break;
+        }
+
+        CHECK_SUCCESS_GOTO(p, rerror, pa_context_errno(p->context) == PA_ERR_NODATA, unlock_and_fail);
+
+        /* Wait until latency data is available again */
+        pa_threaded_mainloop_wait(p->mainloop);
+    }
+
+    pa_threaded_mainloop_unlock(p->mainloop);
+
+    return t;
+
+unlock_and_fail:
+
+    pa_threaded_mainloop_unlock(p->mainloop);
+    return (pa_usec_t) -1;
+}
+
+int pa_blocking_set_volume(pa_blocking *p, int volume, int *rerror) {
+    pa_operation *o = NULL;
+    pa_stream *s = NULL;
+    uint32_t idx;
+    pa_cvolume cv;
+    pa_volume_t v;
+
+    assert(p);
+
+    CHECK_VALIDITY_RETURN_ANY(rerror, p->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE, -1);
+    CHECK_VALIDITY_RETURN_ANY(rerror, volume >= 0, PA_ERR_INVALID, -1);
+    CHECK_VALIDITY_RETURN_ANY(rerror, volume <= 65535, PA_ERR_INVALID, -1);
+
+    pa_threaded_mainloop_lock(p->mainloop);
+    CHECK_DEAD_GOTO(p, rerror, unlock_and_fail);
+
+    CHECK_SUCCESS_GOTO(p, rerror, ((idx = pa_stream_get_index (p->stream)) != PA_INVALID_INDEX), unlock_and_fail);
+
+    s = p->stream;
+    assert(s);
+    pa_cvolume_set(&cv, p->channels, volume);
+
+    o = pa_context_set_sink_input_volume (p->context, idx, &cv, success_context_cb, p);
+    CHECK_SUCCESS_GOTO(p, rerror, o, unlock_and_fail);
+
+    p->operation_success = 0;
+    while (pa_operation_get_state(o) == PA_OPERATION_RUNNING) {
+        pa_threaded_mainloop_wait(p->mainloop);
+        CHECK_DEAD_GOTO(p, rerror, unlock_and_fail);
+    }
+    CHECK_SUCCESS_GOTO(p, rerror, p->operation_success, unlock_and_fail);
+
+    pa_operation_unref(o);
+    pa_threaded_mainloop_unlock(p->mainloop);
+
+    return 0;
+
+unlock_and_fail:
+
+    if (o) {
+        pa_operation_cancel(o);
+        pa_operation_unref(o);
+    }
+
+    pa_threaded_mainloop_unlock(p->mainloop);
+    return -1;
+}

src/contrib/pulseout/pulse_blocking_stream.h

@@ -0,0 +1,82 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio 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 for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#pragma once
+
+#include <sys/types.h>
+#include <stdbool.h>
+
+#include <pulse/sample.h>
+#include <pulse/channelmap.h>
+#include <pulse/def.h>
+#include <pulse/cdecl.h>
+#include <pulse/version.h>
+
+PA_C_DECL_BEGIN
+
+/** \struct pa_blocking
+ * An opaque simple connection object */
+typedef struct pa_blocking pa_blocking;
+
+/** Create a new connection to the server. */
+pa_blocking* pa_blocking_new(
+    const char *server,                 /**< Server name, or NULL for default */
+    const char *name,                   /**< A descriptive name for this client (application name, ...) */
+    pa_stream_direction_t dir,          /**< Open this stream for recording or playback? */
+    const char *dev,                    /**< Sink (resp. source) name, or NULL for default */
+    const char *stream_name,            /**< A descriptive name for this stream (application name, song title, ...) */
+    const pa_sample_spec *ss,           /**< The sample type to use */
+    const pa_channel_map *map,          /**< The channel map to use, or NULL for default */
+    const pa_buffer_attr *attr,         /**< Buffering attributes, or NULL for default */
+    int *error                          /**< A pointer where the error code is stored when the routine returns NULL. It is OK to pass NULL here. */
+    );
+
+/** Close and free the connection to the server. The connection object becomes invalid when this is called. */
+void pa_blocking_free(pa_blocking *s);
+
+/** Write some data to the server. */
+int pa_blocking_write(pa_blocking *s, const void *data, size_t bytes, int *error);
+
+/** Wait until all data already written is played by the daemon. */
+int pa_blocking_drain(pa_blocking *s, int *error);
+
+/** Read some data from the server. This function blocks until \a bytes amount
+ * of data has been received from the server, or until an error occurs.
+ * Returns a negative value on failure. */
+int pa_blocking_read(
+    pa_blocking *s, /**< The connection object. */
+    void *data,     /**< A pointer to a buffer. */
+    size_t bytes,   /**< The number of bytes to read. */
+    int *error
+    /**< A pointer where the error code is stored when the function returns
+     * a negative value. It is OK to pass NULL here. */
+    );
+
+/** Return the playback or record latency. */
+pa_usec_t pa_blocking_get_latency(pa_blocking *s, int *error);
+
+/** Flush the playback or record buffer. This discards any audio in the buffer. */
+int pa_blocking_flush(pa_blocking *s, int *error);
+
+/** Set the output volume of the stream. */
+int pa_blocking_set_volume(pa_blocking *p, int volume, int *rerror);
+
+PA_C_DECL_END
+

src/contrib/pulseout/pulseout_plugin.cpp

@@ -0,0 +1,53 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2007-2016 musikcube team
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//    * Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+//
+//    * Redistributions in binary form must reproduce the above copyright
+//      notice, this list of conditions and the following disclaimer in the
+//      documentation and/or other materials provided with the distribution.
+//
+//    * Neither the name of the author nor the names of other contributors may
+//      be used to endorse or promote products derived from this software
+//      without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#include "pch.h"
+#include <core/sdk/IPlugin.h>
+#include <core/sdk/IOutput.h>
+#include "PulseOut.h"
+
+class PulseOutPlugin : public musik::core::sdk::IPlugin {
+    virtual void Destroy() { delete this; };
+    virtual const char* Name() { return "PulseAudio IOutput plugin"; }
+    virtual const char* Version() { return "0.1"; }
+    virtual const char* Author() { return "clangen"; }
+};
+
+extern "C" musik::core::sdk::IPlugin* GetPlugin() {
+    return new PulseOutPlugin();
+}
+
+extern "C" musik::core::sdk::IOutput* GetAudioOutput() {
+    return new PulseOut();
+}