path: root/Alc/backends/pulseaudio.c

/**
 * OpenAL cross platform audio library
 * Copyright (C) 2009 by Konstantinos Natsakis <konstantinos.natsakis@gmail.com>
 * Copyright (C) 2010 by Chris Robinson <chris.kcat@gmail.com>
 * This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 *  Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the
 *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 *  Boston, MA  02111-1307, USA.
 * Or go to http://www.gnu.org/copyleft/lgpl.html
 */

#include "config.h"

#include "alMain.h"

#include <pulse/pulseaudio.h>

#if PA_API_VERSION == 11
#define PA_STREAM_ADJUST_LATENCY 0x2000U
#define PA_STREAM_EARLY_REQUESTS 0x4000U
static __inline int PA_STREAM_IS_GOOD(pa_stream_state_t x)
{
    return (x == PA_STREAM_CREATING || x == PA_STREAM_READY);
}
static __inline int PA_CONTEXT_IS_GOOD(pa_context_state_t x)
{
    return (x == PA_CONTEXT_CONNECTING || x == PA_CONTEXT_AUTHORIZING ||
            x == PA_CONTEXT_SETTING_NAME || x == PA_CONTEXT_READY);
}
#define PA_STREAM_IS_GOOD PA_STREAM_IS_GOOD
#define PA_CONTEXT_IS_GOOD PA_CONTEXT_IS_GOOD
#elif PA_API_VERSION != 12
#error Invalid PulseAudio API version
#endif

#ifndef PA_CHECK_VERSION
#define PA_CHECK_VERSION(major,minor,micro)                             \
    ((PA_MAJOR > (major)) ||                                            \
     (PA_MAJOR == (major) && PA_MINOR > (minor)) ||                     \
     (PA_MAJOR == (major) && PA_MINOR == (minor) && PA_MICRO >= (micro)))
#endif

static void *pa_handle;
#ifdef HAVE_DYNLOAD
#define MAKE_FUNC(x) static typeof(x) * p##x
MAKE_FUNC(pa_context_unref);
MAKE_FUNC(pa_sample_spec_valid);
MAKE_FUNC(pa_stream_drop);
MAKE_FUNC(pa_strerror);
MAKE_FUNC(pa_context_get_state);
MAKE_FUNC(pa_stream_get_state);
MAKE_FUNC(pa_threaded_mainloop_signal);
MAKE_FUNC(pa_stream_peek);
MAKE_FUNC(pa_threaded_mainloop_wait);
MAKE_FUNC(pa_threaded_mainloop_unlock);
MAKE_FUNC(pa_threaded_mainloop_in_thread);
MAKE_FUNC(pa_context_new);
MAKE_FUNC(pa_threaded_mainloop_stop);
MAKE_FUNC(pa_context_disconnect);
MAKE_FUNC(pa_threaded_mainloop_start);
MAKE_FUNC(pa_threaded_mainloop_get_api);
MAKE_FUNC(pa_context_set_state_callback);
MAKE_FUNC(pa_stream_write);
MAKE_FUNC(pa_xfree);
MAKE_FUNC(pa_stream_connect_record);
MAKE_FUNC(pa_stream_connect_playback);
MAKE_FUNC(pa_stream_readable_size);
MAKE_FUNC(pa_stream_writable_size);
MAKE_FUNC(pa_stream_cork);
MAKE_FUNC(pa_stream_is_suspended);
MAKE_FUNC(pa_stream_get_device_name);
MAKE_FUNC(pa_path_get_filename);
MAKE_FUNC(pa_get_binary_name);
MAKE_FUNC(pa_threaded_mainloop_free);
MAKE_FUNC(pa_context_errno);
MAKE_FUNC(pa_xmalloc);
MAKE_FUNC(pa_stream_unref);
MAKE_FUNC(pa_threaded_mainloop_accept);
MAKE_FUNC(pa_stream_set_write_callback);
MAKE_FUNC(pa_threaded_mainloop_new);
MAKE_FUNC(pa_context_connect);
MAKE_FUNC(pa_stream_set_buffer_attr);
MAKE_FUNC(pa_stream_get_buffer_attr);
MAKE_FUNC(pa_stream_get_sample_spec);
MAKE_FUNC(pa_stream_get_time);
MAKE_FUNC(pa_stream_set_read_callback);
MAKE_FUNC(pa_stream_set_state_callback);
MAKE_FUNC(pa_stream_set_moved_callback);
MAKE_FUNC(pa_stream_set_underflow_callback);
MAKE_FUNC(pa_stream_new);
MAKE_FUNC(pa_stream_disconnect);
MAKE_FUNC(pa_threaded_mainloop_lock);
MAKE_FUNC(pa_channel_map_init_auto);
MAKE_FUNC(pa_channel_map_parse);
MAKE_FUNC(pa_channel_map_snprint);
MAKE_FUNC(pa_channel_map_equal);
MAKE_FUNC(pa_context_get_server_info);
MAKE_FUNC(pa_context_get_sink_info_by_name);
MAKE_FUNC(pa_context_get_sink_info_list);
MAKE_FUNC(pa_context_get_source_info_list);
MAKE_FUNC(pa_operation_get_state);
MAKE_FUNC(pa_operation_unref);
#if PA_CHECK_VERSION(0,9,15)
MAKE_FUNC(pa_channel_map_superset);
MAKE_FUNC(pa_stream_set_buffer_attr_callback);
#endif
#if PA_CHECK_VERSION(0,9,16)
MAKE_FUNC(pa_stream_begin_write);
#endif
#undef MAKE_FUNC

#define pa_context_unref ppa_context_unref
#define pa_sample_spec_valid ppa_sample_spec_valid
#define pa_stream_drop ppa_stream_drop
#define pa_strerror ppa_strerror
#define pa_context_get_state ppa_context_get_state
#define pa_stream_get_state ppa_stream_get_state
#define pa_threaded_mainloop_signal ppa_threaded_mainloop_signal
#define pa_stream_peek ppa_stream_peek
#define pa_threaded_mainloop_wait ppa_threaded_mainloop_wait
#define pa_threaded_mainloop_unlock ppa_threaded_mainloop_unlock
#define pa_threaded_mainloop_in_thread ppa_threaded_mainloop_in_thread
#define pa_context_new ppa_context_new
#define pa_threaded_mainloop_stop ppa_threaded_mainloop_stop
#define pa_context_disconnect ppa_context_disconnect
#define pa_threaded_mainloop_start ppa_threaded_mainloop_start
#define pa_threaded_mainloop_get_api ppa_threaded_mainloop_get_api
#define pa_context_set_state_callback ppa_context_set_state_callback
#define pa_stream_write ppa_stream_write
#define pa_xfree ppa_xfree
#define pa_stream_connect_record ppa_stream_connect_record
#define pa_stream_connect_playback ppa_stream_connect_playback
#define pa_stream_readable_size ppa_stream_readable_size
#define pa_stream_writable_size ppa_stream_writable_size
#define pa_stream_cork ppa_stream_cork
#define pa_stream_is_suspended ppa_stream_is_suspended
#define pa_stream_get_device_name ppa_stream_get_device_name
#define pa_path_get_filename ppa_path_get_filename
#define pa_get_binary_name ppa_get_binary_name
#define pa_threaded_mainloop_free ppa_threaded_mainloop_free
#define pa_context_errno ppa_context_errno
#define pa_xmalloc ppa_xmalloc
#define pa_stream_unref ppa_stream_unref
#define pa_threaded_mainloop_accept ppa_threaded_mainloop_accept
#define pa_stream_set_write_callback ppa_stream_set_write_callback
#define pa_threaded_mainloop_new ppa_threaded_mainloop_new
#define pa_context_connect ppa_context_connect
#define pa_stream_set_buffer_attr ppa_stream_set_buffer_attr
#define pa_stream_get_buffer_attr ppa_stream_get_buffer_attr
#define pa_stream_get_sample_spec ppa_stream_get_sample_spec
#define pa_stream_get_time ppa_stream_get_time
#define pa_stream_set_read_callback ppa_stream_set_read_callback
#define pa_stream_set_state_callback ppa_stream_set_state_callback
#define pa_stream_set_moved_callback ppa_stream_set_moved_callback
#define pa_stream_set_underflow_callback ppa_stream_set_underflow_callback
#define pa_stream_new ppa_stream_new
#define pa_stream_disconnect ppa_stream_disconnect
#define pa_threaded_mainloop_lock ppa_threaded_mainloop_lock
#define pa_channel_map_init_auto ppa_channel_map_init_auto
#define pa_channel_map_parse ppa_channel_map_parse
#define pa_channel_map_snprint ppa_channel_map_snprint
#define pa_channel_map_equal ppa_channel_map_equal
#define pa_context_get_server_info ppa_context_get_server_info
#define pa_context_get_sink_info_by_name ppa_context_get_sink_info_by_name
#define pa_context_get_sink_info_list ppa_context_get_sink_info_list
#define pa_context_get_source_info_list ppa_context_get_source_info_list
#define pa_operation_get_state ppa_operation_get_state
#define pa_operation_unref ppa_operation_unref
#if PA_CHECK_VERSION(0,9,15)
#define pa_channel_map_superset ppa_channel_map_superset
#define pa_stream_set_buffer_attr_callback ppa_stream_set_buffer_attr_callback
#endif
#if PA_CHECK_VERSION(0,9,16)
#define pa_stream_begin_write ppa_stream_begin_write
#endif

#endif

#ifndef PATH_MAX
#define PATH_MAX 4096
#endif

typedef struct {
    char *device_name;

    ALCuint samples;
    ALCuint frame_size;

    RingBuffer *ring;

    pa_buffer_attr attr;
    pa_sample_spec spec;

    pa_threaded_mainloop *loop;

    ALvoid *thread;
    volatile ALboolean killNow;

    pa_stream *stream;
    pa_context *context;
} pulse_data;

typedef struct {
    char *name;
    char *device_name;
} DevMap;


static const ALCchar pulse_device[] = "PulseAudio Default";
static DevMap *allDevNameMap;
static ALuint numDevNames;
static DevMap *allCaptureDevNameMap;
static ALuint numCaptureDevNames;
static pa_context_flags_t pulse_ctx_flags;


static void context_state_callback(pa_context *context, void *pdata)
{
    pa_threaded_mainloop *loop = pdata;
    pa_context_state_t state;

    state = pa_context_get_state(context);
    if(state == PA_CONTEXT_READY || !PA_CONTEXT_IS_GOOD(state))
        pa_threaded_mainloop_signal(loop, 0);
}

static pa_context *connect_context(pa_threaded_mainloop *loop, ALboolean silent)
{
    const char *name = "OpenAL Soft";
    char path_name[PATH_MAX];
    pa_context_state_t state;
    pa_context *context;
    int err;

    if(pa_get_binary_name(path_name, sizeof(path_name)))
        name = pa_path_get_filename(path_name);

    context = pa_context_new(pa_threaded_mainloop_get_api(loop), name);
    if(!context)
    {
        ERR("pa_context_new() failed\n");
        return NULL;
    }

    pa_context_set_state_callback(context, context_state_callback, loop);

    if((err=pa_context_connect(context, NULL, pulse_ctx_flags, NULL)) >= 0)
    {
        while((state=pa_context_get_state(context)) != PA_CONTEXT_READY)
        {
            if(!PA_CONTEXT_IS_GOOD(state))
            {
                err = pa_context_errno(context);
                if(err > 0)  err = -err;
                break;
            }

            pa_threaded_mainloop_wait(loop);
        }
    }
    pa_context_set_state_callback(context, NULL, NULL);

    if(err < 0)
    {
        if(!silent)
            ERR("Context did not connect: %s\n", pa_strerror(err));
        pa_context_unref(context);
        return NULL;
    }

    return context;
}


static ALCboolean pulse_load(void) //{{{
{
    ALCboolean ret = ALC_FALSE;
    if(!pa_handle)
    {
        pa_threaded_mainloop *loop;

#ifdef HAVE_DYNLOAD

#ifdef _WIN32
#define PALIB "libpulse-0.dll"
#elif defined(__APPLE__) && defined(__MACH__)
#define PALIB "libpulse.0.dylib"
#else
#define PALIB "libpulse.so.0"
#endif
        pa_handle = LoadLib(PALIB);
        if(!pa_handle)
            return ALC_FALSE;

#define LOAD_FUNC(x) do {                                                     \
    p##x = GetSymbol(pa_handle, #x);                                          \
    if(!(p##x)) {                                                             \
        CloseLib(pa_handle);                                                  \
        pa_handle = NULL;                                                     \
        return ALC_FALSE;                                                     \
    }                                                                         \
} while(0)
        LOAD_FUNC(pa_context_unref);
        LOAD_FUNC(pa_sample_spec_valid);
        LOAD_FUNC(pa_stream_drop);
        LOAD_FUNC(pa_strerror);
        LOAD_FUNC(pa_context_get_state);
        LOAD_FUNC(pa_stream_get_state);
        LOAD_FUNC(pa_threaded_mainloop_signal);
        LOAD_FUNC(pa_stream_peek);
        LOAD_FUNC(pa_threaded_mainloop_wait);
        LOAD_FUNC(pa_threaded_mainloop_unlock);
        LOAD_FUNC(pa_threaded_mainloop_in_thread);
        LOAD_FUNC(pa_context_new);
        LOAD_FUNC(pa_threaded_mainloop_stop);
        LOAD_FUNC(pa_context_disconnect);
        LOAD_FUNC(pa_threaded_mainloop_start);
        LOAD_FUNC(pa_threaded_mainloop_get_api);
        LOAD_FUNC(pa_context_set_state_callback);
        LOAD_FUNC(pa_stream_write);
        LOAD_FUNC(pa_xfree);
        LOAD_FUNC(pa_stream_connect_record);
        LOAD_FUNC(pa_stream_connect_playback);
        LOAD_FUNC(pa_stream_readable_size);
        LOAD_FUNC(pa_stream_writable_size);
        LOAD_FUNC(pa_stream_cork);
        LOAD_FUNC(pa_stream_is_suspended);
        LOAD_FUNC(pa_stream_get_device_name);
        LOAD_FUNC(pa_path_get_filename);
        LOAD_FUNC(pa_get_binary_name);
        LOAD_FUNC(pa_threaded_mainloop_free);
        LOAD_FUNC(pa_context_errno);
        LOAD_FUNC(pa_xmalloc);
        LOAD_FUNC(pa_stream_unref);
        LOAD_FUNC(pa_threaded_mainloop_accept);
        LOAD_FUNC(pa_stream_set_write_callback);
        LOAD_FUNC(pa_threaded_mainloop_new);
        LOAD_FUNC(pa_context_connect);
        LOAD_FUNC(pa_stream_set_buffer_attr);
        LOAD_FUNC(pa_stream_get_buffer_attr);
        LOAD_FUNC(pa_stream_get_sample_spec);
        LOAD_FUNC(pa_stream_get_time);
        LOAD_FUNC(pa_stream_set_read_callback);
        LOAD_FUNC(pa_stream_set_state_callback);
        LOAD_FUNC(pa_stream_set_moved_callback);
        LOAD_FUNC(pa_stream_set_underflow_callback);
        LOAD_FUNC(pa_stream_new);
        LOAD_FUNC(pa_stream_disconnect);
        LOAD_FUNC(pa_threaded_mainloop_lock);
        LOAD_FUNC(pa_channel_map_init_auto);
        LOAD_FUNC(pa_channel_map_parse);
        LOAD_FUNC(pa_channel_map_snprint);
        LOAD_FUNC(pa_channel_map_equal);
        LOAD_FUNC(pa_context_get_server_info);
        LOAD_FUNC(pa_context_get_sink_info_by_name);
        LOAD_FUNC(pa_context_get_sink_info_list);
        LOAD_FUNC(pa_context_get_source_info_list);
        LOAD_FUNC(pa_operation_get_state);
        LOAD_FUNC(pa_operation_unref);
#undef LOAD_FUNC
#define LOAD_OPTIONAL_FUNC(x) do {                                            \
    p##x = GetSymbol(pa_handle, #x);                                          \
} while(0)
#if PA_CHECK_VERSION(0,9,15)
        LOAD_OPTIONAL_FUNC(pa_channel_map_superset);
        LOAD_OPTIONAL_FUNC(pa_stream_set_buffer_attr_callback);
#endif
#if PA_CHECK_VERSION(0,9,16)
        LOAD_OPTIONAL_FUNC(pa_stream_begin_write);
#endif
#undef LOAD_OPTIONAL_FUNC

#else /* HAVE_DYNLOAD */
        pa_handle = (void*)0xDEADBEEF;
#endif

        if((loop=pa_threaded_mainloop_new()) &&
           pa_threaded_mainloop_start(loop) >= 0)
        {
            pa_context *context;

            pa_threaded_mainloop_lock(loop);
            context = connect_context(loop, AL_TRUE);
            if(context)
            {
                ret = ALC_TRUE;

                pa_context_disconnect(context);
                pa_context_unref(context);
            }
            pa_threaded_mainloop_unlock(loop);
            pa_threaded_mainloop_stop(loop);
        }
        if(loop)
            pa_threaded_mainloop_free(loop);

        if(!ret)
        {
#ifdef HAVE_DYNLOAD
            CloseLib(pa_handle);
#endif
            pa_handle = NULL;
        }
    }
    return ret;
} //}}}

// PulseAudio Event Callbacks //{{{
static void stream_state_callback(pa_stream *stream, void *pdata) //{{{
{
    pa_threaded_mainloop *loop = pdata;
    pa_stream_state_t state;

    state = pa_stream_get_state(stream);
    if(state == PA_STREAM_READY || !PA_STREAM_IS_GOOD(state))
        pa_threaded_mainloop_signal(loop, 0);
}//}}}

static void stream_signal_callback(pa_stream *stream, void *pdata) //{{{
{
    ALCdevice *Device = pdata;
    pulse_data *data = Device->ExtraData;
    (void)stream;

    pa_threaded_mainloop_signal(data->loop, 0);
}//}}}

static void stream_buffer_attr_callback(pa_stream *stream, void *pdata) //{{{
{
    ALCdevice *Device = pdata;
    pulse_data *data = Device->ExtraData;

    LockDevice(Device);

    data->attr = *(pa_stream_get_buffer_attr(stream));
    Device->UpdateSize = data->attr.minreq / data->frame_size;
    Device->NumUpdates = (data->attr.tlength/data->frame_size) / Device->UpdateSize;
    if(Device->NumUpdates <= 1)
    {
        Device->NumUpdates = 1;
        ERR("PulseAudio returned minreq > tlength/2; expect break up\n");
    }

    UnlockDevice(Device);
}//}}}

static void stream_device_callback(pa_stream *stream, void *pdata) //{{{
{
    ALCdevice *Device = pdata;
    pulse_data *data = Device->ExtraData;

    free(data->device_name);
    data->device_name = strdup(pa_stream_get_device_name(stream));
}//}}}

static void context_state_callback2(pa_context *context, void *pdata) //{{{
{
    ALCdevice *Device = pdata;
    pulse_data *data = Device->ExtraData;

    if(pa_context_get_state(context) == PA_CONTEXT_FAILED)
    {
        ERR("Received context failure!\n");
        aluHandleDisconnect(Device);
    }
    pa_threaded_mainloop_signal(data->loop, 0);
}//}}}

static void stream_state_callback2(pa_stream *stream, void *pdata) //{{{
{
    ALCdevice *Device = pdata;
    pulse_data *data = Device->ExtraData;

    if(pa_stream_get_state(stream) == PA_STREAM_FAILED)
    {
        ERR("Received stream failure!\n");
        aluHandleDisconnect(Device);
    }
    pa_threaded_mainloop_signal(data->loop, 0);
}//}}}

static void stream_success_callback(pa_stream *stream, int success, void *pdata) //{{{
{
    ALCdevice *Device = pdata;
    pulse_data *data = Device->ExtraData;
    (void)stream;
    (void)success;

    pa_threaded_mainloop_signal(data->loop, 0);
}//}}}

static void sink_info_callback(pa_context *context, const pa_sink_info *info, int eol, void *pdata) //{{{
{
    ALCdevice *device = pdata;
    pulse_data *data = device->ExtraData;
    char chanmap_str[256] = "";
    const struct {
        const char *str;
        enum DevFmtChannels chans;
    } chanmaps[] = {
        { "front-left,front-right,front-center,lfe,rear-left,rear-right,side-left,side-right",
          DevFmtX71 },
        { "front-left,front-right,front-center,lfe,rear-center,side-left,side-right",
          DevFmtX61 },
        { "front-left,front-right,front-center,lfe,rear-left,rear-right",
          DevFmtX51 },
        { "front-left,front-right,front-center,lfe,side-left,side-right",
          DevFmtX51Side },
        { "front-left,front-right,rear-left,rear-right", DevFmtQuad },
        { "front-left,front-right", DevFmtStereo },
        { "mono", DevFmtMono },
        { NULL, 0 }
    };
    int i;
    (void)context;

    if(eol)
    {
        pa_threaded_mainloop_signal(data->loop, 0);
        return;
    }

    for(i = 0;chanmaps[i].str;i++)
    {
        pa_channel_map map;
        if(!pa_channel_map_parse(&map, chanmaps[i].str))
            continue;

        if(pa_channel_map_equal(&info->channel_map, &map)
#if PA_CHECK_VERSION(0,9,15)
           || (pa_channel_map_superset &&
               pa_channel_map_superset(&info->channel_map, &map))
#endif
            )
        {
            device->FmtChans = chanmaps[i].chans;
            return;
        }
    }

    pa_channel_map_snprint(chanmap_str, sizeof(chanmap_str), &info->channel_map);
    ERR("Failed to find format for channel map:\n    %s\n", chanmap_str);
}//}}}

static void sink_device_callback(pa_context *context, const pa_sink_info *info, int eol, void *pdata) //{{{
{
    pa_threaded_mainloop *loop = pdata;
    char str[1024];
    void *temp;
    int count;
    ALuint i;

    (void)context;

    if(eol)
    {
        pa_threaded_mainloop_signal(loop, 0);
        return;
    }

    count = 0;
    do {
        if(count == 0)
            snprintf(str, sizeof(str), "%s", info->description);
        else
            snprintf(str, sizeof(str), "%s #%d", info->description, count+1);
        count++;

        for(i = 0;i < numDevNames;i++)
        {
            if(strcmp(str, allDevNameMap[i].name) == 0)
                break;
        }
    } while(i != numDevNames);

    temp = realloc(allDevNameMap, (numDevNames+1) * sizeof(*allDevNameMap));
    if(temp)
    {
        allDevNameMap = temp;
        allDevNameMap[numDevNames].name = strdup(str);
        allDevNameMap[numDevNames].device_name = strdup(info->name);
        numDevNames++;
    }
}//}}}

static void source_device_callback(pa_context *context, const pa_source_info *info, int eol, void *pdata) //{{{
{
    pa_threaded_mainloop *loop = pdata;
    char str[1024];
    void *temp;
    int count;
    ALuint i;

    (void)context;

    if(eol)
    {
        pa_threaded_mainloop_signal(loop, 0);
        return;
    }

    count = 0;
    do {
        if(count == 0)
            snprintf(str, sizeof(str), "%s", info->description);
        else
            snprintf(str, sizeof(str), "%s #%d", info->description, count+1);
        count++;

        for(i = 0;i < numCaptureDevNames;i++)
        {
            if(strcmp(str, allCaptureDevNameMap[i].name) == 0)
                break;
        }
    } while(i != numCaptureDevNames);

    temp = realloc(allCaptureDevNameMap, (numCaptureDevNames+1) * sizeof(*allCaptureDevNameMap));
    if(temp)
    {
        allCaptureDevNameMap = temp;
        allCaptureDevNameMap[numCaptureDevNames].name = strdup(str);
        allCaptureDevNameMap[numCaptureDevNames].device_name = strdup(info->name);
        numCaptureDevNames++;
    }
}//}}}
//}}}

// PulseAudio I/O Callbacks //{{{
static void stream_write_callback(pa_stream *stream, size_t len, void *pdata) //{{{
{
    ALCdevice *Device = pdata;
    pulse_data *data = Device->ExtraData;
    (void)stream;
    (void)len;

    pa_threaded_mainloop_signal(data->loop, 0);
} //}}}
//}}}

static ALuint PulseProc(ALvoid *param)
{
    ALCdevice *Device = param;
    pulse_data *data = Device->ExtraData;
    ssize_t len;

    SetRTPriority();

    pa_threaded_mainloop_lock(data->loop);
    do {
        len = (Device->Connected ? pa_stream_writable_size(data->stream) : 0);
        len -= len%(Device->UpdateSize*data->frame_size);
        if(len == 0)
        {
            pa_threaded_mainloop_wait(data->loop);
            continue;
        }

        while(len > 0)
        {
            size_t newlen = len;
            void *buf;
            pa_free_cb_t free_func = NULL;

#if PA_CHECK_VERSION(0,9,16)
            if(!pa_stream_begin_write ||
               pa_stream_begin_write(data->stream, &buf, &newlen) < 0)
#endif
            {
                buf = pa_xmalloc(newlen);
                free_func = pa_xfree;
            }
            pa_threaded_mainloop_unlock(data->loop);

            aluMixData(Device, buf, newlen/data->frame_size);

            pa_threaded_mainloop_lock(data->loop);
            pa_stream_write(data->stream, buf, newlen, free_func, 0, PA_SEEK_RELATIVE);
            len -= newlen;
        }
    } while(Device->Connected && !data->killNow);
    pa_threaded_mainloop_unlock(data->loop);

    return 0;
}

static pa_stream *connect_playback_stream(ALCdevice *device,
    pa_stream_flags_t flags, pa_buffer_attr *attr, pa_sample_spec *spec,
    pa_channel_map *chanmap)
{
    pulse_data *data = device->ExtraData;
    pa_stream_state_t state;
    pa_stream *stream;

    stream = pa_stream_new(data->context, "Playback Stream", spec, chanmap);
    if(!stream)
    {
        ERR("pa_stream_new() failed: %s\n",
            pa_strerror(pa_context_errno(data->context)));
        return NULL;
    }

    pa_stream_set_state_callback(stream, stream_state_callback, data->loop);

    if(pa_stream_connect_playback(stream, data->device_name, attr, flags, NULL, NULL) < 0)
    {
        ERR("Stream did not connect: %s\n",
            pa_strerror(pa_context_errno(data->context)));
        pa_stream_unref(stream);
        return NULL;
    }

    while((state=pa_stream_get_state(stream)) != PA_STREAM_READY)
    {
        if(!PA_STREAM_IS_GOOD(state))
        {
            ERR("Stream did not get ready: %s\n",
                pa_strerror(pa_context_errno(data->context)));
            pa_stream_unref(stream);
            return NULL;
        }

        pa_threaded_mainloop_wait(data->loop);
    }
    pa_stream_set_state_callback(stream, NULL, NULL);

    return stream;
}

static void probe_devices(ALboolean capture)
{
    pa_threaded_mainloop *loop;

    if(capture == AL_FALSE)
        allDevNameMap = malloc(sizeof(DevMap) * 1);
    else
        allCaptureDevNameMap = malloc(sizeof(DevMap) * 1);

    if((loop=pa_threaded_mainloop_new()) &&
       pa_threaded_mainloop_start(loop) >= 0)
    {
        pa_context *context;

        pa_threaded_mainloop_lock(loop);
        context = connect_context(loop, AL_FALSE);
        if(context)
        {
            pa_operation *o;

            if(capture == AL_FALSE)
                o = pa_context_get_sink_info_list(context, sink_device_callback, loop);
            else
                o = pa_context_get_source_info_list(context, source_device_callback, loop);
            while(pa_operation_get_state(o) == PA_OPERATION_RUNNING)
                pa_threaded_mainloop_wait(loop);
            pa_operation_unref(o);

            pa_context_disconnect(context);
            pa_context_unref(context);
        }
        pa_threaded_mainloop_unlock(loop);
        pa_threaded_mainloop_stop(loop);
    }
    if(loop)
        pa_threaded_mainloop_free(loop);
}


static ALCboolean pulse_open(ALCdevice *device, const ALCchar *device_name) //{{{
{
    pulse_data *data = pa_xmalloc(sizeof(pulse_data));
    memset(data, 0, sizeof(*data));

    if(!(data->loop = pa_threaded_mainloop_new()))
    {
        ERR("pa_threaded_mainloop_new() failed!\n");
        goto out;
    }
    if(pa_threaded_mainloop_start(data->loop) < 0)
    {
        ERR("pa_threaded_mainloop_start() failed\n");
        goto out;
    }

    pa_threaded_mainloop_lock(data->loop);
    device->ExtraData = data;

    data->context = connect_context(data->loop, AL_FALSE);
    if(!data->context)
    {
        pa_threaded_mainloop_unlock(data->loop);
        goto out;
    }
    pa_context_set_state_callback(data->context, context_state_callback2, device);

    device->szDeviceName = strdup(device_name);

    pa_threaded_mainloop_unlock(data->loop);
    return ALC_TRUE;

out:
    if(data->loop)
    {
        pa_threaded_mainloop_stop(data->loop);
        pa_threaded_mainloop_free(data->loop);
    }

    device->ExtraData = NULL;
    pa_xfree(data);
    return ALC_FALSE;
} //}}}

static void pulse_close(ALCdevice *device) //{{{
{
    pulse_data *data = device->ExtraData;

    pa_threaded_mainloop_lock(data->loop);

    if(data->stream)
    {
        pa_stream_disconnect(data->stream);
        pa_stream_unref(data->stream);
    }

    pa_context_disconnect(data->context);
    pa_context_unref(data->context);

    pa_threaded_mainloop_unlock(data->loop);

    pa_threaded_mainloop_stop(data->loop);
    pa_threaded_mainloop_free(data->loop);

    DestroyRingBuffer(data->ring);
    free(data->device_name);

    device->ExtraData = NULL;
    pa_xfree(data);
} //}}}
//}}}

// OpenAL {{{
static ALCboolean pulse_open_playback(ALCdevice *device, const ALCchar *device_name) //{{{
{
    char *pulse_name = NULL;
    pa_sample_spec spec;
    pulse_data *data;

    if(!allDevNameMap)
        probe_devices(AL_FALSE);

    if(!device_name)
        device_name = pulse_device;
    else if(strcmp(device_name, pulse_device) != 0)
    {
        ALuint i;

        for(i = 0;i < numDevNames;i++)
        {
            if(strcmp(device_name, allDevNameMap[i].name) == 0)
            {
                pulse_name = allDevNameMap[i].device_name;
                break;
            }
        }
        if(i == numDevNames)
            return ALC_FALSE;
    }

    if(pulse_open(device, device_name) == ALC_FALSE)
        return ALC_FALSE;

    data = device->ExtraData;

    pa_threaded_mainloop_lock(data->loop);

    spec.format = PA_SAMPLE_S16NE;
    spec.rate = 44100;
    spec.channels = 2;

    data->device_name = pulse_name;
    pa_stream *stream = connect_playback_stream(device, 0, NULL, &spec, NULL);
    if(!stream)
    {
        pa_threaded_mainloop_unlock(data->loop);
        goto fail;
    }

    if(pa_stream_is_suspended(stream))
    {
        ERR("Device is suspended\n");
        pa_stream_disconnect(stream);
        pa_stream_unref(stream);
        pa_threaded_mainloop_unlock(data->loop);
        goto fail;
    }
    data->device_name = strdup(pa_stream_get_device_name(stream));

    pa_stream_disconnect(stream);
    pa_stream_unref(stream);

    pa_threaded_mainloop_unlock(data->loop);

    return ALC_TRUE;

fail:
    pulse_close(device);
    return ALC_FALSE;
} //}}}

static void pulse_close_playback(ALCdevice *device) //{{{
{
    pulse_close(device);
} //}}}

static ALCboolean pulse_reset_playback(ALCdevice *device) //{{{
{
    pulse_data *data = device->ExtraData;
    pa_stream_flags_t flags = 0;
    pa_channel_map chanmap;

    pa_threaded_mainloop_lock(data->loop);

    if(!(device->Flags&DEVICE_CHANNELS_REQUEST))
    {
        pa_operation *o;
        o = pa_context_get_sink_info_by_name(data->context, data->device_name, sink_info_callback, device);
        while(pa_operation_get_state(o) == PA_OPERATION_RUNNING)
            pa_threaded_mainloop_wait(data->loop);
        pa_operation_unref(o);
    }
    if(!(device->Flags&DEVICE_FREQUENCY_REQUEST))
        flags |= PA_STREAM_FIX_RATE;

    data->frame_size = FrameSizeFromDevFmt(device->FmtChans, device->FmtType);
    data->attr.prebuf = -1;
    data->attr.fragsize = -1;
    data->attr.minreq = device->UpdateSize * data->frame_size;
    data->attr.tlength = data->attr.minreq * device->NumUpdates;
    if(data->attr.tlength < data->attr.minreq*2)
        data->attr.tlength = data->attr.minreq*2;
    data->attr.maxlength = data->attr.tlength;
    flags |= PA_STREAM_EARLY_REQUESTS;
    flags |= PA_STREAM_INTERPOLATE_TIMING | PA_STREAM_AUTO_TIMING_UPDATE;

    switch(device->FmtType)
    {
        case DevFmtByte:
            device->FmtType = DevFmtUByte;
            /* fall-through */
        case DevFmtUByte:
            data->spec.format = PA_SAMPLE_U8;
            break;
        case DevFmtUShort:
            device->FmtType = DevFmtShort;
            /* fall-through */
        case DevFmtShort:
            data->spec.format = PA_SAMPLE_S16NE;
            break;
        case DevFmtFloat:
            data->spec.format = PA_SAMPLE_FLOAT32NE;
            break;
    }
    data->spec.rate = device->Frequency;
    data->spec.channels = ChannelsFromDevFmt(device->FmtChans);

    if(pa_sample_spec_valid(&data->spec) == 0)
    {
        ERR("Invalid sample format\n");
        pa_threaded_mainloop_unlock(data->loop);
        return ALC_FALSE;
    }

    if(!pa_channel_map_init_auto(&chanmap, data->spec.channels, PA_CHANNEL_MAP_WAVEEX))
    {
        ERR("Couldn't build map for channel count (%d)!\n", data->spec.channels);
        pa_threaded_mainloop_unlock(data->loop);
        return ALC_FALSE;
    }
    SetDefaultWFXChannelOrder(device);

    data->stream = connect_playback_stream(device, flags, &data->attr, &data->spec, &chanmap);
    if(!data->stream)
    {
        pa_threaded_mainloop_unlock(data->loop);
        return ALC_FALSE;
    }

    pa_stream_set_state_callback(data->stream, stream_state_callback2, device);

    data->spec = *(pa_stream_get_sample_spec(data->stream));
    if(device->Frequency != data->spec.rate)
    {
        pa_operation *o;

        if((device->Flags&DEVICE_FREQUENCY_REQUEST))
            ERR("Failed to set frequency %dhz, got %dhz instead\n", device->Frequency, data->spec.rate);
        device->Flags &= ~DEVICE_FREQUENCY_REQUEST;

        /* Server updated our playback rate, so modify the buffer attribs
         * accordingly. */
        data->attr.minreq = (ALuint64)(data->attr.minreq/data->frame_size) *
                            data->spec.rate / device->Frequency * data->frame_size;
        data->attr.tlength = data->attr.minreq * device->NumUpdates;
        data->attr.maxlength = data->attr.tlength;

        o = pa_stream_set_buffer_attr(data->stream, &data->attr,
                                      stream_success_callback, device);
        while(pa_operation_get_state(o) == PA_OPERATION_RUNNING)
            pa_threaded_mainloop_wait(data->loop);
        pa_operation_unref(o);

        device->Frequency = data->spec.rate;
    }

    stream_buffer_attr_callback(data->stream, device);
#if PA_CHECK_VERSION(0,9,15)
    if(pa_stream_set_buffer_attr_callback)
        pa_stream_set_buffer_attr_callback(data->stream, stream_buffer_attr_callback, device);
#endif
    pa_stream_set_moved_callback(data->stream, stream_device_callback, device);
    pa_stream_set_write_callback(data->stream, stream_write_callback, device);
    pa_stream_set_underflow_callback(data->stream, stream_signal_callback, device);

    data->thread = StartThread(PulseProc, device);
    if(!data->thread)
    {
#if PA_CHECK_VERSION(0,9,15)
        if(pa_stream_set_buffer_attr_callback)
            pa_stream_set_buffer_attr_callback(data->stream, NULL, NULL);
#endif
        pa_stream_set_moved_callback(data->stream, NULL, NULL);
        pa_stream_set_write_callback(data->stream, NULL, NULL);
        pa_stream_set_underflow_callback(data->stream, NULL, NULL);
        pa_stream_disconnect(data->stream);
        pa_stream_unref(data->stream);
        data->stream = NULL;

        pa_threaded_mainloop_unlock(data->loop);
        return ALC_FALSE;
    }

    pa_threaded_mainloop_unlock(data->loop);
    return ALC_TRUE;
} //}}}

static void pulse_stop_playback(ALCdevice *device) //{{{
{
    pulse_data *data = device->ExtraData;

    if(!data->stream)
        return;

    data->killNow = AL_TRUE;
    if(data->thread)
    {
        pa_threaded_mainloop_signal(data->loop, 0);
        StopThread(data->thread);
        data->thread = NULL;
    }
    data->killNow = AL_FALSE;

    pa_threaded_mainloop_lock(data->loop);

#if PA_CHECK_VERSION(0,9,15)
    if(pa_stream_set_buffer_attr_callback)
        pa_stream_set_buffer_attr_callback(data->stream, NULL, NULL);
#endif
    pa_stream_set_moved_callback(data->stream, NULL, NULL);
    pa_stream_set_write_callback(data->stream, NULL, NULL);
    pa_stream_set_underflow_callback(data->stream, NULL, NULL);
    pa_stream_disconnect(data->stream);
    pa_stream_unref(data->stream);
    data->stream = NULL;

    pa_threaded_mainloop_unlock(data->loop);
} //}}}


static ALCboolean pulse_open_capture(ALCdevice *device, const ALCchar *device_name) //{{{
{
    char *pulse_name = NULL;
    pulse_data *data;
    pa_stream_flags_t flags = 0;
    pa_stream_state_t state;
    pa_channel_map chanmap;

    if(!allCaptureDevNameMap)
        probe_devices(AL_TRUE);

    if(!device_name)
        device_name = pulse_device;
    else if(strcmp(device_name, pulse_device) != 0)
    {
        ALuint i;

        for(i = 0;i < numCaptureDevNames;i++)
        {
            if(strcmp(device_name, allCaptureDevNameMap[i].name) == 0)
            {
                pulse_name = allCaptureDevNameMap[i].device_name;
                break;
            }
        }
        if(i == numCaptureDevNames)
            return ALC_FALSE;
    }

    if(pulse_open(device, device_name) == ALC_FALSE)
        return ALC_FALSE;

    data = device->ExtraData;
    pa_threaded_mainloop_lock(data->loop);

    data->samples = device->UpdateSize * device->NumUpdates;
    data->frame_size = FrameSizeFromDevFmt(device->FmtChans, device->FmtType);
    if(data->samples < 100 * device->Frequency / 1000)
        data->samples = 100 * device->Frequency / 1000;

    if(!(data->ring = CreateRingBuffer(data->frame_size, data->samples)))
    {
        pa_threaded_mainloop_unlock(data->loop);
        goto fail;
    }

    data->attr.minreq = -1;
    data->attr.prebuf = -1;
    data->attr.maxlength = data->samples * data->frame_size;
    data->attr.tlength = -1;
    data->attr.fragsize = minu(data->samples, 50*device->Frequency/1000) *
                          data->frame_size;

    data->spec.rate = device->Frequency;
    data->spec.channels = ChannelsFromDevFmt(device->FmtChans);

    switch(device->FmtType)
    {
        case DevFmtUByte:
            data->spec.format = PA_SAMPLE_U8;
            break;
        case DevFmtShort:
            data->spec.format = PA_SAMPLE_S16NE;
            break;
        case DevFmtFloat:
            data->spec.format = PA_SAMPLE_FLOAT32NE;
            break;
        case DevFmtByte:
        case DevFmtUShort:
            ERR("Capture format type %#x capture not supported on PulseAudio\n", device->FmtType);
            pa_threaded_mainloop_unlock(data->loop);
            goto fail;
    }

    if(pa_sample_spec_valid(&data->spec) == 0)
    {
        ERR("Invalid sample format\n");
        pa_threaded_mainloop_unlock(data->loop);
        goto fail;
    }

    if(!pa_channel_map_init_auto(&chanmap, data->spec.channels, PA_CHANNEL_MAP_WAVEEX))
    {
        ERR("Couldn't build map for channel count (%d)!\n", data->spec.channels);
        pa_threaded_mainloop_unlock(data->loop);
        goto fail;
    }

    data->stream = pa_stream_new(data->context, "Capture Stream", &data->spec, &chanmap);
    if(!data->stream)
    {
        ERR("pa_stream_new() failed: %s\n",
            pa_strerror(pa_context_errno(data->context)));

        pa_threaded_mainloop_unlock(data->loop);
        goto fail;
    }

    pa_stream_set_state_callback(data->stream, stream_state_callback, data->loop);

    flags |= PA_STREAM_START_CORKED|PA_STREAM_ADJUST_LATENCY;
    if(pa_stream_connect_record(data->stream, pulse_name, &data->attr, flags) < 0)
    {
        ERR("Stream did not connect: %s\n",
            pa_strerror(pa_context_errno(data->context)));

        pa_stream_unref(data->stream);
        data->stream = NULL;

        pa_threaded_mainloop_unlock(data->loop);
        goto fail;
    }

    while((state=pa_stream_get_state(data->stream)) != PA_STREAM_READY)
    {
        if(!PA_STREAM_IS_GOOD(state))
        {
            ERR("Stream did not get ready: %s\n",
                pa_strerror(pa_context_errno(data->context)));

            pa_stream_unref(data->stream);
            data->stream = NULL;

            pa_threaded_mainloop_unlock(data->loop);
            goto fail;
        }

        pa_threaded_mainloop_wait(data->loop);
    }
    pa_stream_set_state_callback(data->stream, stream_state_callback2, device);

    pa_threaded_mainloop_unlock(data->loop);
    return ALC_TRUE;

fail:
    pulse_close(device);
    return ALC_FALSE;
} //}}}

static void pulse_close_capture(ALCdevice *device) //{{{
{
    pulse_close(device);
} //}}}

static void pulse_start_capture(ALCdevice *device) //{{{
{
    pulse_data *data = device->ExtraData;
    pa_operation *o;

    pa_threaded_mainloop_lock(data->loop);
    o = pa_stream_cork(data->stream, 0, stream_success_callback, device);
    while(pa_operation_get_state(o) == PA_OPERATION_RUNNING)
        pa_threaded_mainloop_wait(data->loop);
    pa_operation_unref(o);
    pa_threaded_mainloop_unlock(data->loop);
} //}}}

static void pulse_stop_capture(ALCdevice *device) //{{{
{
    pulse_data *data = device->ExtraData;
    pa_operation *o;

    pa_threaded_mainloop_lock(data->loop);
    o = pa_stream_cork(data->stream, 1, stream_success_callback, device);
    while(pa_operation_get_state(o) == PA_OPERATION_RUNNING)
        pa_threaded_mainloop_wait(data->loop);
    pa_operation_unref(o);
    pa_threaded_mainloop_unlock(data->loop);
} //}}}

static ALCuint pulse_available_samples(ALCdevice *device) //{{{
{
    pulse_data *data = device->ExtraData;
    size_t samples;

    pa_threaded_mainloop_lock(data->loop);
    /* Capture is done in fragment-sized chunks, so we loop until we get all
     * that's available */
    samples = (device->Connected ? pa_stream_readable_size(data->stream) : 0);
    while(samples > 0)
    {
        const void *buf;
        size_t length;

        if(pa_stream_peek(data->stream, &buf, &length) < 0)
        {
            ERR("pa_stream_peek() failed: %s\n",
                pa_strerror(pa_context_errno(data->context)));
            break;
        }

        WriteRingBuffer(data->ring, buf, length/data->frame_size);
        samples -= length;

        pa_stream_drop(data->stream);
    }
    pa_threaded_mainloop_unlock(data->loop);

    return RingBufferSize(data->ring);
} //}}}

static void pulse_capture_samples(ALCdevice *device, ALCvoid *buffer, ALCuint samples) //{{{
{
    pulse_data *data = device->ExtraData;

    if(pulse_available_samples(device) >= samples)
        ReadRingBuffer(data->ring, buffer, samples);
    else
        alcSetError(device, ALC_INVALID_VALUE);
} //}}}


static const BackendFuncs pulse_funcs = { //{{{
    pulse_open_playback,
    pulse_close_playback,
    pulse_reset_playback,
    pulse_stop_playback,
    pulse_open_capture,
    pulse_close_capture,
    pulse_start_capture,
    pulse_stop_capture,
    pulse_capture_samples,
    pulse_available_samples
}; //}}}

ALCboolean alc_pulse_init(BackendFuncs *func_list) //{{{
{
    if(!pulse_load())
        return ALC_FALSE;

    *func_list = pulse_funcs;

    pulse_ctx_flags = 0;
    if(!GetConfigValueBool("pulse", "spawn-server", 0))
        pulse_ctx_flags |= PA_CONTEXT_NOAUTOSPAWN;

    return ALC_TRUE;
} //}}}

void alc_pulse_deinit(void) //{{{
{
    ALuint i;

    for(i = 0;i < numDevNames;++i)
    {
        free(allDevNameMap[i].name);
        free(allDevNameMap[i].device_name);
    }
    free(allDevNameMap);
    allDevNameMap = NULL;
    numDevNames = 0;

    for(i = 0;i < numCaptureDevNames;++i)
    {
        free(allCaptureDevNameMap[i].name);
        free(allCaptureDevNameMap[i].device_name);
    }
    free(allCaptureDevNameMap);
    allCaptureDevNameMap = NULL;
    numCaptureDevNames = 0;

#ifdef HAVE_DYNLOAD
    if(pa_handle)
        CloseLib(pa_handle);
    pa_handle = NULL;
#endif
} //}}}

void alc_pulse_probe(enum DevProbe type) //{{{
{
    pa_threaded_mainloop *loop;
    ALuint i;

    switch(type)
    {
        case DEVICE_PROBE:
            if((loop=pa_threaded_mainloop_new()) &&
               pa_threaded_mainloop_start(loop) >= 0)
            {
                pa_context *context;

                pa_threaded_mainloop_lock(loop);
                context = connect_context(loop, AL_FALSE);
                if(context)
                {
                    AppendDeviceList(pulse_device);

                    pa_context_disconnect(context);
                    pa_context_unref(context);
                }
                pa_threaded_mainloop_unlock(loop);
                pa_threaded_mainloop_stop(loop);
            }
            if(loop)
                pa_threaded_mainloop_free(loop);
            break;

        case ALL_DEVICE_PROBE:
            for(i = 0;i < numDevNames;++i)
            {
                free(allDevNameMap[i].name);
                free(allDevNameMap[i].device_name);
            }
            free(allDevNameMap);
            allDevNameMap = NULL;
            numDevNames = 0;

            probe_devices(AL_FALSE);

            for(i = 0;i < numDevNames;i++)
                AppendAllDeviceList(allDevNameMap[i].name);
            break;

        case CAPTURE_DEVICE_PROBE:
            for(i = 0;i < numCaptureDevNames;++i)
            {
                free(allCaptureDevNameMap[i].name);
                free(allCaptureDevNameMap[i].device_name);
            }
            free(allCaptureDevNameMap);
            allCaptureDevNameMap = NULL;
            numCaptureDevNames = 0;

            probe_devices(AL_TRUE);

            for(i = 0;i < numCaptureDevNames;i++)
                AppendCaptureDeviceList(allCaptureDevNameMap[i].name);
            break;
    }
} //}}}
//}}}