Remove the QSA backend

It's been broken for who knows how long, and could really do with a rewrite for
the new interface anyway.

2 files changed, 0 insertions, 979 deletions

diff --git a/alc/backends/qsa.cpp b/alc/backends/qsa.cpp
deleted file mode 100644
index ef43e080..00000000
--- a/alc/backends/qsa.cpp
+++ /dev/null
@@ -1,960 +0,0 @@
-/**
- * OpenAL cross platform audio library
- * Copyright (C) 2011-2013 by authors.
- * 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.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- * Or go to http://www.gnu.org/copyleft/lgpl.html
- */
-
-#include "config.h"
-
-#include "backends/qsa.h"
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <sched.h>
-#include <errno.h>
-#include <memory.h>
-#include <poll.h>
-
-#include <thread>
-#include <memory>
-#include <algorithm>
-
-#include "alcmain.h"
-#include "alexcpt.h"
-#include "alu.h"
-#include "threads.h"
-
-#include <sys/asoundlib.h>
-#include <sys/neutrino.h>
-
-
-namespace {
-
-struct qsa_data {
-    snd_pcm_t* pcmHandle{nullptr};
-    int audio_fd{-1};
-
-    snd_pcm_channel_setup_t  csetup{};
-    snd_pcm_channel_params_t cparams{};
-
-    ALvoid* buffer{nullptr};
-    ALsizei size{0};
-
-    std::atomic<ALenum> mKillNow{AL_TRUE};
-    std::thread mThread;
-};
-
-struct DevMap {
-    ALCchar* name;
-    int card;
-    int dev;
-};
-
-al::vector<DevMap> DeviceNameMap;
-al::vector<DevMap> CaptureNameMap;
-
-constexpr ALCchar qsaDevice[] = "QSA Default";
-
-constexpr struct {
-    int32_t format;
-} formatlist[] = {
-    {SND_PCM_SFMT_FLOAT_LE},
-    {SND_PCM_SFMT_S32_LE},
-    {SND_PCM_SFMT_U32_LE},
-    {SND_PCM_SFMT_S16_LE},
-    {SND_PCM_SFMT_U16_LE},
-    {SND_PCM_SFMT_S8},
-    {SND_PCM_SFMT_U8},
-    {0},
-};
-
-constexpr struct {
-    int32_t rate;
-} ratelist[] = {
-    {192000},
-    {176400},
-    {96000},
-    {88200},
-    {48000},
-    {44100},
-    {32000},
-    {24000},
-    {22050},
-    {16000},
-    {12000},
-    {11025},
-    {8000},
-    {0},
-};
-
-constexpr struct {
-    int32_t channels;
-} channellist[] = {
-    {8},
-    {7},
-    {6},
-    {4},
-    {2},
-    {1},
-    {0},
-};
-
-void deviceList(int type, al::vector<DevMap> *devmap)
-{
-    snd_ctl_t* handle;
-    snd_pcm_info_t pcminfo;
-    int max_cards, card, err, dev;
-    DevMap entry;
-    char name[1024];
-    snd_ctl_hw_info info;
-
-    max_cards = snd_cards();
-    if(max_cards < 0)
-        return;
-
-    std::for_each(devmap->begin(), devmap->end(),
-        [](const DevMap &entry) -> void
-        { free(entry.name); }
-    );
-    devmap->clear();
-
-    entry.name = strdup(qsaDevice);
-    entry.card = 0;
-    entry.dev = 0;
-    devmap->push_back(entry);
-
-    for(card = 0;card < max_cards;card++)
-    {
-        if((err=snd_ctl_open(&handle, card)) < 0)
-            continue;
-
-        if((err=snd_ctl_hw_info(handle, &info)) < 0)
-        {
-            snd_ctl_close(handle);
-            continue;
-        }
-
-        for(dev = 0;dev < (int)info.pcmdevs;dev++)
-        {
-            if((err=snd_ctl_pcm_info(handle, dev, &pcminfo)) < 0)
-                continue;
-
-            if((type==SND_PCM_CHANNEL_PLAYBACK && (pcminfo.flags&SND_PCM_INFO_PLAYBACK)) ||
-               (type==SND_PCM_CHANNEL_CAPTURE && (pcminfo.flags&SND_PCM_INFO_CAPTURE)))
-            {
-                snprintf(name, sizeof(name), "%s [%s] (hw:%d,%d)", info.name, pcminfo.name, card, dev);
-                entry.name = strdup(name);
-                entry.card = card;
-                entry.dev = dev;
-
-                devmap->push_back(entry);
-                TRACE("Got device \"%s\", card %d, dev %d\n", name, card, dev);
-            }
-        }
-        snd_ctl_close(handle);
-    }
-}
-
-
-/* Wrappers to use an old-style backend with the new interface. */
-struct PlaybackWrapper final : public BackendBase {
-    PlaybackWrapper(ALCdevice *device) noexcept : BackendBase{device} { }
-    ~PlaybackWrapper() override;
-
-    void open(const ALCchar *name) override;
-    bool reset() override;
-    bool start() override;
-    void stop() override;
-
-    std::unique_ptr<qsa_data> mExtraData;
-
-    DEF_NEWDEL(PlaybackWrapper)
-};
-
-
-FORCE_ALIGN static int qsa_proc_playback(void *ptr)
-{
-    PlaybackWrapper *self = static_cast<PlaybackWrapper*>(ptr);
-    ALCdevice *device = self->mDevice;
-    qsa_data *data = self->mExtraData.get();
-    snd_pcm_channel_status_t status;
-    sched_param param;
-    char* write_ptr;
-    ALint len;
-    int sret;
-
-    SetRTPriority();
-    althrd_setname(MIXER_THREAD_NAME);
-
-    /* Increase default 10 priority to 11 to avoid jerky sound */
-    SchedGet(0, 0, &param);
-    param.sched_priority=param.sched_curpriority+1;
-    SchedSet(0, 0, SCHED_NOCHANGE, &param);
-
-    const ALint frame_size = device->frameSizeFromFmt();
-
-    while(!data->mKillNow.load(std::memory_order_acquire))
-    {
-        pollfd pollitem{};
-        pollitem.fd = data->audio_fd;
-        pollitem.events = POLLOUT;
-
-        /* Select also works like time slice to OS */
-        sret = poll(&pollitem, 1, 2000);
-        if(sret == -1)
-        {
-            if(errno == EINTR || errno == EAGAIN)
-                continue;
-            ERR("poll error: %s\n", strerror(errno));
-            aluHandleDisconnect(device, "Failed waiting for playback buffer: %s", strerror(errno));
-            break;
-        }
-        if(sret == 0)
-        {
-            ERR("poll timeout\n");
-            continue;
-        }
-
-        len = data->size;
-        write_ptr = static_cast<char*>(data->buffer);
-        aluMixData(device, write_ptr, len/frame_size);
-        while(len>0 && !data->mKillNow.load(std::memory_order_acquire))
-        {
-            int wrote = snd_pcm_plugin_write(data->pcmHandle, write_ptr, len);
-            if(wrote <= 0)
-            {
-                if(errno==EAGAIN || errno==EWOULDBLOCK)
-                    continue;
-
-                memset(&status, 0, sizeof(status));
-                status.channel = SND_PCM_CHANNEL_PLAYBACK;
-
-                snd_pcm_plugin_status(data->pcmHandle, &status);
-
-                /* we need to reinitialize the sound channel if we've underrun the buffer */
-                if(status.status == SND_PCM_STATUS_UNDERRUN ||
-                   status.status == SND_PCM_STATUS_READY)
-                {
-                    if(snd_pcm_plugin_prepare(data->pcmHandle, SND_PCM_CHANNEL_PLAYBACK) < 0)
-                    {
-                        aluHandleDisconnect(device, "Playback recovery failed");
-                        break;
-                    }
-                }
-            }
-            else
-            {
-                write_ptr += wrote;
-                len -= wrote;
-            }
-        }
-    }
-
-    return 0;
-}
-
-/************/
-/* Playback */
-/************/
-
-static ALCenum qsa_open_playback(PlaybackWrapper *self, const ALCchar* deviceName)
-{
-    ALCdevice *device = self->mDevice;
-    int card, dev;
-    int status;
-
-    std::unique_ptr<qsa_data> data{new qsa_data{}};
-    data->mKillNow.store(AL_TRUE, std::memory_order_relaxed);
-
-    if(!deviceName)
-        deviceName = qsaDevice;
-
-    if(strcmp(deviceName, qsaDevice) == 0)
-        status = snd_pcm_open_preferred(&data->pcmHandle, &card, &dev, SND_PCM_OPEN_PLAYBACK);
-    else
-    {
-        if(DeviceNameMap.empty())
-            deviceList(SND_PCM_CHANNEL_PLAYBACK, &DeviceNameMap);
-
-        auto iter = std::find_if(DeviceNameMap.begin(), DeviceNameMap.end(),
-            [deviceName](const DevMap &entry) -> bool
-            { return entry.name && strcmp(deviceName, entry.name) == 0; }
-        );
-        if(iter == DeviceNameMap.cend())
-            return ALC_INVALID_DEVICE;
-
-        status = snd_pcm_open(&data->pcmHandle, iter->card, iter->dev, SND_PCM_OPEN_PLAYBACK);
-    }
-
-    if(status < 0)
-        return ALC_INVALID_DEVICE;
-
-    data->audio_fd = snd_pcm_file_descriptor(data->pcmHandle, SND_PCM_CHANNEL_PLAYBACK);
-    if(data->audio_fd < 0)
-    {
-        snd_pcm_close(data->pcmHandle);
-        return ALC_INVALID_DEVICE;
-    }
-
-    device->DeviceName = deviceName;
-    self->mExtraData = std::move(data);
-
-    return ALC_NO_ERROR;
-}
-
-static void qsa_close_playback(PlaybackWrapper *self)
-{
-    qsa_data *data = self->mExtraData.get();
-
-    if (data->buffer!=NULL)
-    {
-        free(data->buffer);
-        data->buffer=NULL;
-    }
-
-    snd_pcm_close(data->pcmHandle);
-
-    self->mExtraData = nullptr;
-}
-
-static ALCboolean qsa_reset_playback(PlaybackWrapper *self)
-{
-    ALCdevice *device = self->mDevice;
-    qsa_data *data = self->mExtraData.get();
-    int32_t format=-1;
-
-    switch(device->FmtType)
-    {
-        case DevFmtByte:
-             format=SND_PCM_SFMT_S8;
-             break;
-        case DevFmtUByte:
-             format=SND_PCM_SFMT_U8;
-             break;
-        case DevFmtShort:
-             format=SND_PCM_SFMT_S16_LE;
-             break;
-        case DevFmtUShort:
-             format=SND_PCM_SFMT_U16_LE;
-             break;
-        case DevFmtInt:
-             format=SND_PCM_SFMT_S32_LE;
-             break;
-        case DevFmtUInt:
-             format=SND_PCM_SFMT_U32_LE;
-             break;
-        case DevFmtFloat:
-             format=SND_PCM_SFMT_FLOAT_LE;
-             break;
-    }
-
-    /* we actually don't want to block on writes */
-    snd_pcm_nonblock_mode(data->pcmHandle, 1);
-    /* Disable mmap to control data transfer to the audio device */
-    snd_pcm_plugin_set_disable(data->pcmHandle, PLUGIN_DISABLE_MMAP);
-    snd_pcm_plugin_set_disable(data->pcmHandle, PLUGIN_DISABLE_BUFFER_PARTIAL_BLOCKS);
-
-    // configure a sound channel
-    memset(&data->cparams, 0, sizeof(data->cparams));
-    data->cparams.channel=SND_PCM_CHANNEL_PLAYBACK;
-    data->cparams.mode=SND_PCM_MODE_BLOCK;
-    data->cparams.start_mode=SND_PCM_START_FULL;
-    data->cparams.stop_mode=SND_PCM_STOP_STOP;
-
-    data->cparams.buf.block.frag_size=device->UpdateSize * device->frameSizeFromFmt();
-    data->cparams.buf.block.frags_max=device->BufferSize / device->UpdateSize;
-    data->cparams.buf.block.frags_min=data->cparams.buf.block.frags_max;
-
-    data->cparams.format.interleave=1;
-    data->cparams.format.rate=device->Frequency;
-    data->cparams.format.voices=device->channelsFromFmt();
-    data->cparams.format.format=format;
-
-    if ((snd_pcm_plugin_params(data->pcmHandle, &data->cparams))<0)
-    {
-        int original_rate=data->cparams.format.rate;
-        int original_voices=data->cparams.format.voices;
-        int original_format=data->cparams.format.format;
-        int it;
-        int jt;
-
-        for (it=0; it<1; it++)
-        {
-            /* Check for second pass */
-            if (it==1)
-            {
-                original_rate=ratelist[0].rate;
-                original_voices=channellist[0].channels;
-                original_format=formatlist[0].format;
-            }
-
-            do {
-                /* At first downgrade sample format */
-                jt=0;
-                do {
-                    if (formatlist[jt].format==data->cparams.format.format)
-                    {
-                        data->cparams.format.format=formatlist[jt+1].format;
-                        break;
-                    }
-                    if (formatlist[jt].format==0)
-                    {
-                        data->cparams.format.format=0;
-                        break;
-                    }
-                    jt++;
-                } while(1);
-
-                if (data->cparams.format.format==0)
-                {
-                    data->cparams.format.format=original_format;
-
-                    /* At secod downgrade sample rate */
-                    jt=0;
-                    do {
-                        if (ratelist[jt].rate==data->cparams.format.rate)
-                        {
-                            data->cparams.format.rate=ratelist[jt+1].rate;
-                            break;
-                        }
-                        if (ratelist[jt].rate==0)
-                        {
-                            data->cparams.format.rate=0;
-                            break;
-                        }
-                        jt++;
-                    } while(1);
-
-                    if (data->cparams.format.rate==0)
-                    {
-                        data->cparams.format.rate=original_rate;
-                        data->cparams.format.format=original_format;
-
-                        /* At third downgrade channels number */
-                        jt=0;
-                        do {
-                            if(channellist[jt].channels==data->cparams.format.voices)
-                            {
-                                data->cparams.format.voices=channellist[jt+1].channels;
-                                break;
-                            }
-                            if (channellist[jt].channels==0)
-                            {
-                                data->cparams.format.voices=0;
-                                break;
-                            }
-                           jt++;
-                        } while(1);
-                    }
-
-                    if (data->cparams.format.voices==0)
-                    {
-                        break;
-                    }
-                }
-
-                data->cparams.buf.block.frag_size=device->UpdateSize*
-                    data->cparams.format.voices*
-                    snd_pcm_format_width(data->cparams.format.format)/8;
-                data->cparams.buf.block.frags_max=device->NumUpdates;
-                data->cparams.buf.block.frags_min=device->NumUpdates;
-                if ((snd_pcm_plugin_params(data->pcmHandle, &data->cparams))<0)
-                {
-                    continue;
-                }
-                else
-                {
-                    break;
-                }
-            } while(1);
-
-            if (data->cparams.format.voices!=0)
-            {
-                break;
-            }
-        }
-
-        if (data->cparams.format.voices==0)
-        {
-            return ALC_FALSE;
-        }
-    }
-
-    if ((snd_pcm_plugin_prepare(data->pcmHandle, SND_PCM_CHANNEL_PLAYBACK))<0)
-    {
-        return ALC_FALSE;
-    }
-
-    memset(&data->csetup, 0, sizeof(data->csetup));
-    data->csetup.channel=SND_PCM_CHANNEL_PLAYBACK;
-    if (snd_pcm_plugin_setup(data->pcmHandle, &data->csetup)<0)
-    {
-        return ALC_FALSE;
-    }
-
-    /* now fill back to the our AL device */
-    device->Frequency=data->cparams.format.rate;
-
-    switch (data->cparams.format.voices)
-    {
-        case 1:
-             device->FmtChans=DevFmtMono;
-             break;
-        case 2:
-             device->FmtChans=DevFmtStereo;
-             break;
-        case 4:
-             device->FmtChans=DevFmtQuad;
-             break;
-        case 6:
-             device->FmtChans=DevFmtX51;
-             break;
-        case 7:
-             device->FmtChans=DevFmtX61;
-             break;
-        case 8:
-             device->FmtChans=DevFmtX71;
-             break;
-        default:
-             device->FmtChans=DevFmtMono;
-             break;
-    }
-
-    switch (data->cparams.format.format)
-    {
-        case SND_PCM_SFMT_S8:
-             device->FmtType=DevFmtByte;
-             break;
-        case SND_PCM_SFMT_U8:
-             device->FmtType=DevFmtUByte;
-             break;
-        case SND_PCM_SFMT_S16_LE:
-             device->FmtType=DevFmtShort;
-             break;
-        case SND_PCM_SFMT_U16_LE:
-             device->FmtType=DevFmtUShort;
-             break;
-        case SND_PCM_SFMT_S32_LE:
-             device->FmtType=DevFmtInt;
-             break;
-        case SND_PCM_SFMT_U32_LE:
-             device->FmtType=DevFmtUInt;
-             break;
-        case SND_PCM_SFMT_FLOAT_LE:
-             device->FmtType=DevFmtFloat;
-             break;
-        default:
-             device->FmtType=DevFmtShort;
-             break;
-    }
-
-    SetDefaultChannelOrder(device);
-
-    device->UpdateSize=data->csetup.buf.block.frag_size / device->frameSizeFromFmt();
-    device->NumUpdates=data->csetup.buf.block.frags;
-
-    data->size=data->csetup.buf.block.frag_size;
-    data->buffer=malloc(data->size);
-    if (!data->buffer)
-    {
-        return ALC_FALSE;
-    }
-
-    return ALC_TRUE;
-}
-
-static ALCboolean qsa_start_playback(PlaybackWrapper *self)
-{
-    qsa_data *data = self->mExtraData.get();
-
-    try {
-        data->mKillNow.store(AL_FALSE, std::memory_order_release);
-        data->mThread = std::thread(qsa_proc_playback, self);
-        return ALC_TRUE;
-    }
-    catch(std::exception& e) {
-        ERR("Could not create playback thread: %s\n", e.what());
-    }
-    catch(...) {
-    }
-    return ALC_FALSE;
-}
-
-static void qsa_stop_playback(PlaybackWrapper *self)
-{
-    qsa_data *data = self->mExtraData.get();
-
-    if(data->mKillNow.exchange(AL_TRUE, std::memory_order_acq_rel) || !data->mThread.joinable())
-        return;
-    data->mThread.join();
-}
-
-
-PlaybackWrapper::~PlaybackWrapper()
-{
-    if(mExtraData)
-        qsa_close_playback(this);
-}
-
-void PlaybackWrapper::open(const ALCchar *name)
-{
-    if(auto err = qsa_open_playback(this, name))
-        throw al::backend_exception{ALC_INVALID_VALUE, "%d", err};
-}
-
-bool PlaybackWrapper::reset()
-{
-    if(!qsa_reset_playback(this))
-        throw al::backend_exception{ALC_INVALID_VALUE, ""};
-    return true;
-}
-
-bool PlaybackWrapper::start()
-{ return qsa_start_playback(this); }
-
-void PlaybackWrapper::stop()
-{ qsa_stop_playback(this); }
-
-
-/***********/
-/* Capture */
-/***********/
-
-struct CaptureWrapper final : public BackendBase {
-    CaptureWrapper(ALCdevice *device) noexcept : BackendBase{device} { }
-    ~CaptureWrapper() override;
-
-    void open(const ALCchar *name) override;
-    bool start() override;
-    void stop() override;
-    ALCenum captureSamples(al::byte *buffer, ALCuint samples) override;
-    ALCuint availableSamples() override;
-
-    std::unique_ptr<qsa_data> mExtraData;
-
-    DEF_NEWDEL(CaptureWrapper)
-};
-
-static ALCenum qsa_open_capture(CaptureWrapper *self, const ALCchar *deviceName)
-{
-    ALCdevice *device = self->mDevice;
-    int card, dev;
-    int format=-1;
-    int status;
-
-    std::unique_ptr<qsa_data> data{new qsa_data{}};
-
-    if(!deviceName)
-        deviceName = qsaDevice;
-
-    if(strcmp(deviceName, qsaDevice) == 0)
-        status = snd_pcm_open_preferred(&data->pcmHandle, &card, &dev, SND_PCM_OPEN_CAPTURE);
-    else
-    {
-        if(CaptureNameMap.empty())
-            deviceList(SND_PCM_CHANNEL_CAPTURE, &CaptureNameMap);
-
-        auto iter = std::find_if(CaptureNameMap.cbegin(), CaptureNameMap.cend(),
-            [deviceName](const DevMap &entry) -> bool
-            { return entry.name && strcmp(deviceName, entry.name) == 0; }
-        );
-        if(iter == CaptureNameMap.cend())
-            return ALC_INVALID_DEVICE;
-
-        status = snd_pcm_open(&data->pcmHandle, iter->card, iter->dev, SND_PCM_OPEN_CAPTURE);
-    }
-
-    if(status < 0)
-        return ALC_INVALID_DEVICE;
-
-    data->audio_fd = snd_pcm_file_descriptor(data->pcmHandle, SND_PCM_CHANNEL_CAPTURE);
-    if(data->audio_fd < 0)
-    {
-        snd_pcm_close(data->pcmHandle);
-        return ALC_INVALID_DEVICE;
-    }
-
-    device->DeviceName = deviceName;
-
-    switch (device->FmtType)
-    {
-        case DevFmtByte:
-             format=SND_PCM_SFMT_S8;
-             break;
-        case DevFmtUByte:
-             format=SND_PCM_SFMT_U8;
-             break;
-        case DevFmtShort:
-             format=SND_PCM_SFMT_S16_LE;
-             break;
-        case DevFmtUShort:
-             format=SND_PCM_SFMT_U16_LE;
-             break;
-        case DevFmtInt:
-             format=SND_PCM_SFMT_S32_LE;
-             break;
-        case DevFmtUInt:
-             format=SND_PCM_SFMT_U32_LE;
-             break;
-        case DevFmtFloat:
-             format=SND_PCM_SFMT_FLOAT_LE;
-             break;
-    }
-
-    /* we actually don't want to block on reads */
-    snd_pcm_nonblock_mode(data->pcmHandle, 1);
-    /* Disable mmap to control data transfer to the audio device */
-    snd_pcm_plugin_set_disable(data->pcmHandle, PLUGIN_DISABLE_MMAP);
-
-    /* configure a sound channel */
-    memset(&data->cparams, 0, sizeof(data->cparams));
-    data->cparams.mode=SND_PCM_MODE_BLOCK;
-    data->cparams.channel=SND_PCM_CHANNEL_CAPTURE;
-    data->cparams.start_mode=SND_PCM_START_GO;
-    data->cparams.stop_mode=SND_PCM_STOP_STOP;
-
-    data->cparams.buf.block.frag_size=device->UpdateSize * device->frameSizeFromFmt();
-    data->cparams.buf.block.frags_max=device->NumUpdates;
-    data->cparams.buf.block.frags_min=device->NumUpdates;
-
-    data->cparams.format.interleave=1;
-    data->cparams.format.rate=device->Frequency;
-    data->cparams.format.voices=device->channelsFromFmt();
-    data->cparams.format.format=format;
-
-    if(snd_pcm_plugin_params(data->pcmHandle, &data->cparams) < 0)
-    {
-        snd_pcm_close(data->pcmHandle);
-        return ALC_INVALID_VALUE;
-    }
-
-    self->mExtraData = std::move(data);
-
-    return ALC_NO_ERROR;
-}
-
-static void qsa_close_capture(CaptureWrapper *self)
-{
-    qsa_data *data = self->mExtraData.get();
-
-    if (data->pcmHandle!=nullptr)
-        snd_pcm_close(data->pcmHandle);
-    data->pcmHandle = nullptr;
-
-    self->mExtraData = nullptr;
-}
-
-static void qsa_start_capture(CaptureWrapper *self)
-{
-    qsa_data *data = self->mExtraData.get();
-    int rstatus;
-
-    if ((rstatus=snd_pcm_plugin_prepare(data->pcmHandle, SND_PCM_CHANNEL_CAPTURE))<0)
-    {
-        ERR("capture prepare failed: %s\n", snd_strerror(rstatus));
-        return;
-    }
-
-    memset(&data->csetup, 0, sizeof(data->csetup));
-    data->csetup.channel=SND_PCM_CHANNEL_CAPTURE;
-    if ((rstatus=snd_pcm_plugin_setup(data->pcmHandle, &data->csetup))<0)
-    {
-        ERR("capture setup failed: %s\n", snd_strerror(rstatus));
-        return;
-    }
-
-    snd_pcm_capture_go(data->pcmHandle);
-}
-
-static void qsa_stop_capture(CaptureWrapper *self)
-{
-    qsa_data *data = self->mExtraData.get();
-    snd_pcm_capture_flush(data->pcmHandle);
-}
-
-static ALCuint qsa_available_samples(CaptureWrapper *self)
-{
-    ALCdevice *device = self->mDevice;
-    qsa_data *data = self->mExtraData.get();
-    snd_pcm_channel_status_t status;
-    ALint frame_size = device->frameSizeFromFmt();
-    ALint free_size;
-    int rstatus;
-
-    memset(&status, 0, sizeof (status));
-    status.channel=SND_PCM_CHANNEL_CAPTURE;
-    snd_pcm_plugin_status(data->pcmHandle, &status);
-    if ((status.status==SND_PCM_STATUS_OVERRUN) ||
-        (status.status==SND_PCM_STATUS_READY))
-    {
-        if ((rstatus=snd_pcm_plugin_prepare(data->pcmHandle, SND_PCM_CHANNEL_CAPTURE))<0)
-        {
-            ERR("capture prepare failed: %s\n", snd_strerror(rstatus));
-            aluHandleDisconnect(device, "Failed capture recovery: %s", snd_strerror(rstatus));
-            return 0;
-        }
-
-        snd_pcm_capture_go(data->pcmHandle);
-        return 0;
-    }
-
-    free_size=data->csetup.buf.block.frag_size*data->csetup.buf.block.frags;
-    free_size-=status.free;
-
-    return free_size/frame_size;
-}
-
-static ALCenum qsa_capture_samples(CaptureWrapper *self, ALCvoid *buffer, ALCuint samples)
-{
-    ALCdevice *device = self->mDevice;
-    qsa_data *data = self->mExtraData.get();
-    char* read_ptr;
-    snd_pcm_channel_status_t status;
-    int selectret;
-    int bytes_read;
-    ALint frame_size=device->frameSizeFromFmt();
-    ALint len=samples*frame_size;
-    int rstatus;
-
-    read_ptr = static_cast<char*>(buffer);
-
-    while (len>0)
-    {
-        pollfd pollitem{};
-        pollitem.fd = data->audio_fd;
-        pollitem.events = POLLOUT;
-
-        /* Select also works like time slice to OS */
-        bytes_read=0;
-        selectret = poll(&pollitem, 1, 2000);
-        switch (selectret)
-        {
-            case -1:
-                 aluHandleDisconnect(device, "Failed to check capture samples");
-                 return ALC_INVALID_DEVICE;
-            case 0:
-                 break;
-            default:
-                 bytes_read=snd_pcm_plugin_read(data->pcmHandle, read_ptr, len);
-                 break;
-        }
-
-        if (bytes_read<=0)
-        {
-            if ((errno==EAGAIN) || (errno==EWOULDBLOCK))
-            {
-                continue;
-            }
-
-            memset(&status, 0, sizeof (status));
-            status.channel=SND_PCM_CHANNEL_CAPTURE;
-            snd_pcm_plugin_status(data->pcmHandle, &status);
-
-            /* we need to reinitialize the sound channel if we've overrun the buffer */
-            if ((status.status==SND_PCM_STATUS_OVERRUN) ||
-                (status.status==SND_PCM_STATUS_READY))
-            {
-                if ((rstatus=snd_pcm_plugin_prepare(data->pcmHandle, SND_PCM_CHANNEL_CAPTURE))<0)
-                {
-                    ERR("capture prepare failed: %s\n", snd_strerror(rstatus));
-                    aluHandleDisconnect(device, "Failed capture recovery: %s",
-                                        snd_strerror(rstatus));
-                    return ALC_INVALID_DEVICE;
-                }
-                snd_pcm_capture_go(data->pcmHandle);
-            }
-        }
-        else
-        {
-            read_ptr+=bytes_read;
-            len-=bytes_read;
-        }
-    }
-
-    return ALC_NO_ERROR;
-}
-
-
-CaptureWrapper::~CaptureWrapper()
-{
-    if(mExtraData)
-        qsa_close_capture(this);
-}
-
-void CaptureWrapper::open(const ALCchar *name)
-{
-    if(auto err = qsa_open_capture(this, name))
-        throw al::backend_exception{ALC_INVALID_VALUE, "%d", err};
-}
-
-bool CaptureWrapper::start()
-{ qsa_start_capture(this); return true; }
-
-void CaptureWrapper::stop()
-{ qsa_stop_capture(this); }
-
-ALCenum CaptureWrapper::captureSamples(al::byte *buffer, ALCuint samples)
-{ return qsa_capture_samples(this, buffer, samples); }
-
-ALCuint CaptureWrapper::availableSamples()
-{ return qsa_available_samples(this); }
-
-} // namespace
-
-
-bool QSABackendFactory::init()
-{ return true; }
-
-bool QSABackendFactory::querySupport(BackendType type)
-{ return (type == BackendType::Playback || type == BackendType::Capture); }
-
-void QSABackendFactory::probe(DevProbe type, std::string *outnames)
-{
-    auto add_device = [outnames](const DevMap &entry) -> void
-    {
-        const char *n = entry.name;
-        if(n && n[0])
-            outnames->append(n, strlen(n)+1);
-    };
-
-    switch (type)
-    {
-        case DevProbe::Playback:
-            deviceList(SND_PCM_CHANNEL_PLAYBACK, &DeviceNameMap);
-            std::for_each(DeviceNameMap.cbegin(), DeviceNameMap.cend(), add_device);
-            break;
-        case DevProbe::Capture:
-            deviceList(SND_PCM_CHANNEL_CAPTURE, &CaptureNameMap);
-            std::for_each(CaptureNameMap.cbegin(), CaptureNameMap.cend(), add_device);
-            break;
-    }
-}
-
-BackendPtr QSABackendFactory::createBackend(ALCdevice *device, BackendType type)
-{
-    if(type == BackendType::Playback)
-        return BackendPtr{new PlaybackWrapper{device}};
-    if(type == BackendType::Capture)
-        return BackendPtr{new CaptureWrapper{device}};
-    return nullptr;
-}
-
-BackendFactory &QSABackendFactory::getFactory()
-{
-    static QSABackendFactory factory{};
-    return factory;
-}
diff --git a/alc/backends/qsa.h b/alc/backends/qsa.h
deleted file mode 100644
index da548bba..00000000
--- a/alc/backends/qsa.h
+++ /dev/null
@@ -1,19 +0,0 @@
-#ifndef BACKENDS_QSA_H
-#define BACKENDS_QSA_H
-
-#include "backends/base.h"
-
-struct QSABackendFactory final : public BackendFactory {
-public:
-    bool init() override;
-
-    bool querySupport(BackendType type) override;
-
-    void probe(DevProbe type, std::string *outnames) override;
-
-    BackendPtr createBackend(ALCdevice *device, BackendType type) override;
-
-    static BackendFactory &getFactory();
-};
-
-#endif /* BACKENDS_QSA_H */