First Commit

externals/openal-soft/alc/backends/solaris.cpp

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+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 1999-2007 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 "solaris.h"
+
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <memory.h>
+#include <unistd.h>
+#include <errno.h>
+#include <poll.h>
+#include <math.h>
+#include <string.h>
+
+#include <thread>
+#include <functional>
+
+#include "albyte.h"
+#include "alc/alconfig.h"
+#include "core/device.h"
+#include "core/helpers.h"
+#include "core/logging.h"
+#include "threads.h"
+#include "vector.h"
+
+#include <sys/audioio.h>
+
+
+namespace {
+
+constexpr char solaris_device[] = "Solaris Default";
+
+std::string solaris_driver{"/dev/audio"};
+
+
+struct SolarisBackend final : public BackendBase {
+    SolarisBackend(DeviceBase *device) noexcept : BackendBase{device} { }
+    ~SolarisBackend() override;
+
+    int mixerProc();
+
+    void open(const char *name) override;
+    bool reset() override;
+    void start() override;
+    void stop() override;
+
+    int mFd{-1};
+
+    uint mFrameStep{};
+    al::vector<al::byte> mBuffer;
+
+    std::atomic<bool> mKillNow{true};
+    std::thread mThread;
+
+    DEF_NEWDEL(SolarisBackend)
+};
+
+SolarisBackend::~SolarisBackend()
+{
+    if(mFd != -1)
+        close(mFd);
+    mFd = -1;
+}
+
+int SolarisBackend::mixerProc()
+{
+    SetRTPriority();
+    althrd_setname(MIXER_THREAD_NAME);
+
+    const size_t frame_step{mDevice->channelsFromFmt()};
+    const uint frame_size{mDevice->frameSizeFromFmt()};
+
+    while(!mKillNow.load(std::memory_order_acquire)
+        && mDevice->Connected.load(std::memory_order_acquire))
+    {
+        pollfd pollitem{};
+        pollitem.fd = mFd;
+        pollitem.events = POLLOUT;
+
+        int pret{poll(&pollitem, 1, 1000)};
+        if(pret < 0)
+        {
+            if(errno == EINTR || errno == EAGAIN)
+                continue;
+            ERR("poll failed: %s\n", strerror(errno));
+            mDevice->handleDisconnect("Failed to wait for playback buffer: %s", strerror(errno));
+            break;
+        }
+        else if(pret == 0)
+        {
+            WARN("poll timeout\n");
+            continue;
+        }
+
+        al::byte *write_ptr{mBuffer.data()};
+        size_t to_write{mBuffer.size()};
+        mDevice->renderSamples(write_ptr, static_cast<uint>(to_write/frame_size), frame_step);
+        while(to_write > 0 && !mKillNow.load(std::memory_order_acquire))
+        {
+            ssize_t wrote{write(mFd, write_ptr, to_write)};
+            if(wrote < 0)
+            {
+                if(errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
+                    continue;
+                ERR("write failed: %s\n", strerror(errno));
+                mDevice->handleDisconnect("Failed to write playback samples: %s", strerror(errno));
+                break;
+            }
+
+            to_write -= static_cast<size_t>(wrote);
+            write_ptr += wrote;
+        }
+    }
+
+    return 0;
+}
+
+
+void SolarisBackend::open(const char *name)
+{
+    if(!name)
+        name = solaris_device;
+    else if(strcmp(name, solaris_device) != 0)
+        throw al::backend_exception{al::backend_error::NoDevice, "Device name \"%s\" not found",
+            name};
+
+    int fd{::open(solaris_driver.c_str(), O_WRONLY)};
+    if(fd == -1)
+        throw al::backend_exception{al::backend_error::NoDevice, "Could not open %s: %s",
+            solaris_driver.c_str(), strerror(errno)};
+
+    if(mFd != -1)
+        ::close(mFd);
+    mFd = fd;
+
+    mDevice->DeviceName = name;
+}
+
+bool SolarisBackend::reset()
+{
+    audio_info_t info;
+    AUDIO_INITINFO(&info);
+
+    info.play.sample_rate = mDevice->Frequency;
+    info.play.channels = mDevice->channelsFromFmt();
+    switch(mDevice->FmtType)
+    {
+    case DevFmtByte:
+        info.play.precision = 8;
+        info.play.encoding = AUDIO_ENCODING_LINEAR;
+        break;
+    case DevFmtUByte:
+        info.play.precision = 8;
+        info.play.encoding = AUDIO_ENCODING_LINEAR8;
+        break;
+    case DevFmtUShort:
+    case DevFmtInt:
+    case DevFmtUInt:
+    case DevFmtFloat:
+        mDevice->FmtType = DevFmtShort;
+        /* fall-through */
+    case DevFmtShort:
+        info.play.precision = 16;
+        info.play.encoding = AUDIO_ENCODING_LINEAR;
+        break;
+    }
+    info.play.buffer_size = mDevice->BufferSize * mDevice->frameSizeFromFmt();
+
+    if(ioctl(mFd, AUDIO_SETINFO, &info) < 0)
+    {
+        ERR("ioctl failed: %s\n", strerror(errno));
+        return false;
+    }
+
+    if(mDevice->channelsFromFmt() != info.play.channels)
+    {
+        if(info.play.channels >= 2)
+            mDevice->FmtChans = DevFmtStereo;
+        else if(info.play.channels == 1)
+            mDevice->FmtChans = DevFmtMono;
+        else
+            throw al::backend_exception{al::backend_error::DeviceError,
+                "Got %u device channels", info.play.channels};
+    }
+
+    if(info.play.precision == 8 && info.play.encoding == AUDIO_ENCODING_LINEAR8)
+        mDevice->FmtType = DevFmtUByte;
+    else if(info.play.precision == 8 && info.play.encoding == AUDIO_ENCODING_LINEAR)
+        mDevice->FmtType = DevFmtByte;
+    else if(info.play.precision == 16 && info.play.encoding == AUDIO_ENCODING_LINEAR)
+        mDevice->FmtType = DevFmtShort;
+    else if(info.play.precision == 32 && info.play.encoding == AUDIO_ENCODING_LINEAR)
+        mDevice->FmtType = DevFmtInt;
+    else
+    {
+        ERR("Got unhandled sample type: %d (0x%x)\n", info.play.precision, info.play.encoding);
+        return false;
+    }
+
+    uint frame_size{mDevice->bytesFromFmt() * info.play.channels};
+    mFrameStep = info.play.channels;
+    mDevice->Frequency = info.play.sample_rate;
+    mDevice->BufferSize = info.play.buffer_size / frame_size;
+    /* How to get the actual period size/count? */
+    mDevice->UpdateSize = mDevice->BufferSize / 2;
+
+    setDefaultChannelOrder();
+
+    mBuffer.resize(mDevice->UpdateSize * size_t{frame_size});
+    std::fill(mBuffer.begin(), mBuffer.end(), al::byte{});
+
+    return true;
+}
+
+void SolarisBackend::start()
+{
+    try {
+        mKillNow.store(false, std::memory_order_release);
+        mThread = std::thread{std::mem_fn(&SolarisBackend::mixerProc), this};
+    }
+    catch(std::exception& e) {
+        throw al::backend_exception{al::backend_error::DeviceError,
+            "Failed to start mixing thread: %s", e.what()};
+    }
+}
+
+void SolarisBackend::stop()
+{
+    if(mKillNow.exchange(true, std::memory_order_acq_rel) || !mThread.joinable())
+        return;
+    mThread.join();
+
+    if(ioctl(mFd, AUDIO_DRAIN) < 0)
+        ERR("Error draining device: %s\n", strerror(errno));
+}
+
+} // namespace
+
+BackendFactory &SolarisBackendFactory::getFactory()
+{
+    static SolarisBackendFactory factory{};
+    return factory;
+}
+
+bool SolarisBackendFactory::init()
+{
+    if(auto devopt = ConfigValueStr(nullptr, "solaris", "device"))
+        solaris_driver = std::move(*devopt);
+    return true;
+}
+
+bool SolarisBackendFactory::querySupport(BackendType type)
+{ return type == BackendType::Playback; }
+
+std::string SolarisBackendFactory::probe(BackendType type)
+{
+    std::string outnames;
+    switch(type)
+    {
+    case BackendType::Playback:
+    {
+        struct stat buf;
+        if(stat(solaris_driver.c_str(), &buf) == 0)
+            outnames.append(solaris_device, sizeof(solaris_device));
+    }
+    break;
+
+    case BackendType::Capture:
+        break;
+    }
+    return outnames;
+}
+
+BackendPtr SolarisBackendFactory::createBackend(DeviceBase *device, BackendType type)
+{
+    if(type == BackendType::Playback)
+        return BackendPtr{new SolarisBackend{device}};
+    return nullptr;
+}