Archipelago » qemu

/*

 * QEMU OSS audio driver

 *

 * Copyright (c) 2003-2005 Vassili Karpov (malc)

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include <stdlib.h>

#include <sys/mman.h>

#include <sys/types.h>

#include <sys/ioctl.h>

#ifdef __OpenBSD__

#include <soundcard.h>

#else

#include <sys/soundcard.h>

#endif

#include "qemu-common.h"

#include "host-utils.h"

#include "qemu-char.h"

#include "audio.h"

#define AUDIO_CAP "oss"

#include "audio_int.h"

#if defined OSS_GETVERSION && defined SNDCTL_DSP_POLICY

#define USE_DSP_POLICY

#endif

typedef struct OSSVoiceOut {

    HWVoiceOut hw;

    void *pcm_buf;

    int fd;

    int wpos;

    int nfrags;

    int fragsize;

    int mmapped;

    int pending;

} OSSVoiceOut;

typedef struct OSSVoiceIn {

    HWVoiceIn hw;

    void *pcm_buf;

    int fd;

    int nfrags;

    int fragsize;

} OSSVoiceIn;

static struct {

    int try_mmap;

    int nfrags;

    int fragsize;

    const char *devpath_out;

    const char *devpath_in;

    int debug;

    int exclusive;

    int policy;

} conf = {

    .try_mmap = 0,

    .nfrags = 4,

    .fragsize = 4096,

    .devpath_out = "/dev/dsp",

    .devpath_in = "/dev/dsp",

    .debug = 0,

    .exclusive = 0,

    .policy = 5

};

struct oss_params {

    int freq;

    audfmt_e fmt;

    int nchannels;

    int nfrags;

    int fragsize;

};

static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)

{

    va_list ap;

    va_start (ap, fmt);

    AUD_vlog (AUDIO_CAP, fmt, ap);

    va_end (ap);

    AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));

}

static void GCC_FMT_ATTR (3, 4) oss_logerr2 (

    int err,

    const char *typ,

    const char *fmt,

    ...

    )

{

    va_list ap;

    AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);

    va_start (ap, fmt);

    AUD_vlog (AUDIO_CAP, fmt, ap);

    va_end (ap);

    AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));

}

static void oss_anal_close (int *fdp)

{

    int err;

    qemu_set_fd_handler (*fdp, NULL, NULL, NULL);

    err = close (*fdp);

    if (err) {

        oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);

    }

    *fdp = -1;

}

static void oss_helper_poll_out (void *opaque)

{

    (void) opaque;

    audio_run ("oss_poll_out");

}

static void oss_helper_poll_in (void *opaque)

{

    (void) opaque;

    audio_run ("oss_poll_in");

}

static int oss_poll_out (HWVoiceOut *hw)

{

    OSSVoiceOut *oss = (OSSVoiceOut *) hw;

    return qemu_set_fd_handler (oss->fd, NULL, oss_helper_poll_out, NULL);

}

static int oss_poll_in (HWVoiceIn *hw)

{

    OSSVoiceIn *oss = (OSSVoiceIn *) hw;

    return qemu_set_fd_handler (oss->fd, oss_helper_poll_in, NULL, NULL);

}

static int oss_write (SWVoiceOut *sw, void *buf, int len)

{

    return audio_pcm_sw_write (sw, buf, len);

}

static int aud_to_ossfmt (audfmt_e fmt)

{

    switch (fmt) {

    case AUD_FMT_S8:

        return AFMT_S8;

    case AUD_FMT_U8:

        return AFMT_U8;

    case AUD_FMT_S16:

        return AFMT_S16_LE;

    case AUD_FMT_U16:

        return AFMT_U16_LE;

    default:

        dolog ("Internal logic error: Bad audio format %d\n", fmt);

#ifdef DEBUG_AUDIO

        abort ();

#endif

        return AFMT_U8;

    }

}

static int oss_to_audfmt (int ossfmt, audfmt_e *fmt, int *endianness)

{

    switch (ossfmt) {

    case AFMT_S8:

        *endianness = 0;

        *fmt = AUD_FMT_S8;

        break;

    case AFMT_U8:

        *endianness = 0;

        *fmt = AUD_FMT_U8;

        break;

    case AFMT_S16_LE:

        *endianness = 0;

        *fmt = AUD_FMT_S16;

        break;

    case AFMT_U16_LE:

        *endianness = 0;

        *fmt = AUD_FMT_U16;

        break;

    case AFMT_S16_BE:

        *endianness = 1;

        *fmt = AUD_FMT_S16;

        break;

    case AFMT_U16_BE:

        *endianness = 1;

        *fmt = AUD_FMT_U16;

        break;

    default:

        dolog ("Unrecognized audio format %d\n", ossfmt);

        return -1;

    }

    return 0;

}

#if defined DEBUG_MISMATCHES || defined DEBUG

static void oss_dump_info (struct oss_params *req, struct oss_params *obt)

{

    dolog ("parameter | requested value | obtained value\n");

    dolog ("format    |      %10d |     %10d\n", req->fmt, obt->fmt);

    dolog ("channels  |      %10d |     %10d\n",

           req->nchannels, obt->nchannels);

    dolog ("frequency |      %10d |     %10d\n", req->freq, obt->freq);

    dolog ("nfrags    |      %10d |     %10d\n", req->nfrags, obt->nfrags);

    dolog ("fragsize  |      %10d |     %10d\n",

           req->fragsize, obt->fragsize);

}

#endif

#ifdef USE_DSP_POLICY

static int oss_get_version (int fd, int *version, const char *typ)

{

    if (ioctl (fd, OSS_GETVERSION, &version)) {

#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)

        /*

         * Looks like atm (20100109) FreeBSD knows OSS_GETVERSION

         * since 7.x, but currently only on the mixer device (or in

         * the Linuxolator), and in the native version that part of

         * the code is in fact never reached so the ioctl fails anyway.

         * Until this is fixed, just check the errno and if its what

         * FreeBSD's sound drivers return atm assume they are new enough.

         */

        if (errno == EINVAL) {

            *version = 0x040000;

            return 0;

        }

#endif

        oss_logerr2 (errno, typ, "Failed to get OSS version\n");

        return -1;

    }

    return 0;

}

#endif

static int oss_open (int in, struct oss_params *req,

                     struct oss_params *obt, int *pfd)

{

    int fd;

    int oflags = conf.exclusive ? O_EXCL : 0;

    audio_buf_info abinfo;

    int fmt, freq, nchannels;

    int setfragment = 1;

    const char *dspname = in ? conf.devpath_in : conf.devpath_out;

    const char *typ = in ? "ADC" : "DAC";

    /* Kludge needed to have working mmap on Linux */

    oflags |= conf.try_mmap ? O_RDWR : (in ? O_RDONLY : O_WRONLY);

    fd = open (dspname, oflags | O_NONBLOCK);

    if (-1 == fd) {

        oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);

        return -1;

    }

    freq = req->freq;

    nchannels = req->nchannels;

    fmt = req->fmt;

    if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {

        oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);

        goto err;

    }

    if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {

        oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",

                     req->nchannels);

        goto err;

    }

    if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {

        oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);

        goto err;

    }

    if (ioctl (fd, SNDCTL_DSP_NONBLOCK, NULL)) {

        oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");

        goto err;

    }

#ifdef USE_DSP_POLICY

    if (conf.policy >= 0) {

        int version;

        if (!oss_get_version (fd, &version, typ)) {

            if (conf.debug) {

                dolog ("OSS version = %#x\n", version);

            }

            if (version >= 0x040000) {

                int policy = conf.policy;

                if (ioctl (fd, SNDCTL_DSP_POLICY, &policy)) {

                    oss_logerr2 (errno, typ,

                                 "Failed to set timing policy to %d\n",

                                 conf.policy);

                    goto err;

                }

                setfragment = 0;

            }

        }

    }

#endif

    if (setfragment) {

        int mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize);

        if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {

            oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",

                         req->nfrags, req->fragsize);

            goto err;

        }

    }

    if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {

        oss_logerr2 (errno, typ, "Failed to get buffer length\n");

        goto err;

    }

    if (!abinfo.fragstotal || !abinfo.fragsize) {

        AUD_log (AUDIO_CAP, "Returned bogus buffer information(%d, %d) for %s\n",

                 abinfo.fragstotal, abinfo.fragsize, typ);

        goto err;

    }

    obt->fmt = fmt;

    obt->nchannels = nchannels;

    obt->freq = freq;

    obt->nfrags = abinfo.fragstotal;

    obt->fragsize = abinfo.fragsize;

    *pfd = fd;

#ifdef DEBUG_MISMATCHES

    if ((req->fmt != obt->fmt) ||

        (req->nchannels != obt->nchannels) ||

        (req->freq != obt->freq) ||

        (req->fragsize != obt->fragsize) ||

        (req->nfrags != obt->nfrags)) {

        dolog ("Audio parameters mismatch\n");

        oss_dump_info (req, obt);

    }

#endif

#ifdef DEBUG

    oss_dump_info (req, obt);

#endif

    return 0;

 err:

    oss_anal_close (&fd);

    return -1;

}

static void oss_write_pending (OSSVoiceOut *oss)

{

    HWVoiceOut *hw = &oss->hw;

    if (oss->mmapped) {

        return;

    }

    while (oss->pending) {

        int samples_written;

        ssize_t bytes_written;

        int samples_till_end = hw->samples - oss->wpos;

        int samples_to_write = audio_MIN (oss->pending, samples_till_end);

        int bytes_to_write = samples_to_write << hw->info.shift;

        void *pcm = advance (oss->pcm_buf, oss->wpos << hw->info.shift);

        bytes_written = write (oss->fd, pcm, bytes_to_write);

        if (bytes_written < 0) {

            if (errno != EAGAIN) {

                oss_logerr (errno, "failed to write %d bytes\n",

                            bytes_to_write);

            }

            break;

        }

        if (bytes_written & hw->info.align) {

            dolog ("misaligned write asked for %d, but got %zd\n",

                   bytes_to_write, bytes_written);

            return;

        }

        samples_written = bytes_written >> hw->info.shift;

        oss->pending -= samples_written;

        oss->wpos = (oss->wpos + samples_written) % hw->samples;

        if (bytes_written - bytes_to_write) {

            break;

        }

    }

}

static int oss_run_out (HWVoiceOut *hw, int live)

{

    OSSVoiceOut *oss = (OSSVoiceOut *) hw;

    int err, decr;

    struct audio_buf_info abinfo;

    struct count_info cntinfo;

    int bufsize;

    bufsize = hw->samples << hw->info.shift;

    if (oss->mmapped) {

        int bytes, pos;

        err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);

        if (err < 0) {

            oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");

            return 0;

        }

        pos = hw->rpos << hw->info.shift;

        bytes = audio_ring_dist (cntinfo.ptr, pos, bufsize);

        decr = audio_MIN (bytes >> hw->info.shift, live);

    }

    else {

        err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);

        if (err < 0) {

            oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");

            return 0;

        }

        if (abinfo.bytes > bufsize) {

            if (conf.debug) {

                dolog ("warning: Invalid available size, size=%d bufsize=%d\n"

                       "please report your OS/audio hw to av1474@comtv.ru\n",

                       abinfo.bytes, bufsize);

            }

            abinfo.bytes = bufsize;

        }

        if (abinfo.bytes < 0) {

            if (conf.debug) {

                dolog ("warning: Invalid available size, size=%d bufsize=%d\n",

                       abinfo.bytes, bufsize);

            }

            return 0;

        }

        decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);

        if (!decr) {

            return 0;

        }

    }

    decr = audio_pcm_hw_clip_out (hw, oss->pcm_buf, decr, oss->pending);

    oss->pending += decr;

    oss_write_pending (oss);

    return decr;

}

static void oss_fini_out (HWVoiceOut *hw)

{

    int err;

    OSSVoiceOut *oss = (OSSVoiceOut *) hw;

    ldebug ("oss_fini\n");

    oss_anal_close (&oss->fd);

    if (oss->pcm_buf) {

        if (oss->mmapped) {

            err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);

            if (err) {

                oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",

                            oss->pcm_buf, hw->samples << hw->info.shift);

            }

        }

        else {

            qemu_free (oss->pcm_buf);

        }

        oss->pcm_buf = NULL;

    }

}

static int oss_init_out (HWVoiceOut *hw, struct audsettings *as)

{

    OSSVoiceOut *oss = (OSSVoiceOut *) hw;

    struct oss_params req, obt;

    int endianness;

    int err;

    int fd;

    audfmt_e effective_fmt;

    struct audsettings obt_as;

    oss->fd = -1;

    req.fmt = aud_to_ossfmt (as->fmt);

    req.freq = as->freq;

    req.nchannels = as->nchannels;

    req.fragsize = conf.fragsize;

    req.nfrags = conf.nfrags;

    if (oss_open (0, &req, &obt, &fd)) {

        return -1;

    }

    err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);

    if (err) {

        oss_anal_close (&fd);

        return -1;

    }

    obt_as.freq = obt.freq;

    obt_as.nchannels = obt.nchannels;

    obt_as.fmt = effective_fmt;

    obt_as.endianness = endianness;

    audio_pcm_init_info (&hw->info, &obt_as);

    oss->nfrags = obt.nfrags;

    oss->fragsize = obt.fragsize;

    if (obt.nfrags * obt.fragsize & hw->info.align) {

        dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",

               obt.nfrags * obt.fragsize, hw->info.align + 1);

    }

    hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;

    oss->mmapped = 0;

    if (conf.try_mmap) {

        oss->pcm_buf = mmap (

            NULL,

            hw->samples << hw->info.shift,

            PROT_READ | PROT_WRITE,

            MAP_SHARED,

            fd,

            0

            );

        if (oss->pcm_buf == MAP_FAILED) {

            oss_logerr (errno, "Failed to map %d bytes of DAC\n",

                        hw->samples << hw->info.shift);

        }

        else {

            int err;

            int trig = 0;

            if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {

                oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");

            }

            else {

                trig = PCM_ENABLE_OUTPUT;

                if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {

                    oss_logerr (

                        errno,

                        "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"

                        );

                }

                else {

                    oss->mmapped = 1;

                }

            }

            if (!oss->mmapped) {

                err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);

                if (err) {

                    oss_logerr (errno, "Failed to unmap buffer %p size %d\n",

                                oss->pcm_buf, hw->samples << hw->info.shift);

                }

            }

        }

    }

    if (!oss->mmapped) {

        oss->pcm_buf = audio_calloc (

            AUDIO_FUNC,

            hw->samples,

            1 << hw->info.shift

            );

        if (!oss->pcm_buf) {

            dolog (

                "Could not allocate DAC buffer (%d samples, each %d bytes)\n",

                hw->samples,

                1 << hw->info.shift

                );

            oss_anal_close (&fd);

            return -1;

        }

    }

    oss->fd = fd;

    return 0;

}

static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)

{

    int trig;

    OSSVoiceOut *oss = (OSSVoiceOut *) hw;

    switch (cmd) {

    case VOICE_ENABLE:

        {

            va_list ap;

            int poll_mode;

            va_start (ap, cmd);

            poll_mode = va_arg (ap, int);

            va_end (ap);

            ldebug ("enabling voice\n");

            if (poll_mode && oss_poll_out (hw)) {

                poll_mode = 0;

            }

            hw->poll_mode = poll_mode;

            if (!oss->mmapped) {

                return 0;

            }

            audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);

            trig = PCM_ENABLE_OUTPUT;

            if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {

                oss_logerr (

                    errno,

                    "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"

                    );

                return -1;

            }

        }

        break;

    case VOICE_DISABLE:

        if (hw->poll_mode) {

            qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);

            hw->poll_mode = 0;

        }

        if (!oss->mmapped) {

            return 0;

        }

        ldebug ("disabling voice\n");

        trig = 0;

        if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {

            oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");

            return -1;

        }

        break;

    }

    return 0;

}

static int oss_init_in (HWVoiceIn *hw, struct audsettings *as)

{

    OSSVoiceIn *oss = (OSSVoiceIn *) hw;

    struct oss_params req, obt;

    int endianness;

    int err;

    int fd;

    audfmt_e effective_fmt;

    struct audsettings obt_as;

    oss->fd = -1;

    req.fmt = aud_to_ossfmt (as->fmt);

    req.freq = as->freq;

    req.nchannels = as->nchannels;

    req.fragsize = conf.fragsize;

    req.nfrags = conf.nfrags;

    if (oss_open (1, &req, &obt, &fd)) {

        return -1;

    }

    err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);

    if (err) {

        oss_anal_close (&fd);

        return -1;

    }

    obt_as.freq = obt.freq;

    obt_as.nchannels = obt.nchannels;

    obt_as.fmt = effective_fmt;

    obt_as.endianness = endianness;

    audio_pcm_init_info (&hw->info, &obt_as);

    oss->nfrags = obt.nfrags;

    oss->fragsize = obt.fragsize;

    if (obt.nfrags * obt.fragsize & hw->info.align) {

        dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",

               obt.nfrags * obt.fragsize, hw->info.align + 1);

    }

    hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;

    oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);

    if (!oss->pcm_buf) {

        dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",

               hw->samples, 1 << hw->info.shift);

        oss_anal_close (&fd);

        return -1;

    }

    oss->fd = fd;

    return 0;

}

static void oss_fini_in (HWVoiceIn *hw)

{

    OSSVoiceIn *oss = (OSSVoiceIn *) hw;

    oss_anal_close (&oss->fd);

    if (oss->pcm_buf) {

        qemu_free (oss->pcm_buf);

        oss->pcm_buf = NULL;

    }

}

static int oss_run_in (HWVoiceIn *hw)

{

    OSSVoiceIn *oss = (OSSVoiceIn *) hw;

    int hwshift = hw->info.shift;

    int i;

    int live = audio_pcm_hw_get_live_in (hw);

    int dead = hw->samples - live;

    size_t read_samples = 0;

    struct {

        int add;

        int len;

    } bufs[2] = {

        { .add = hw->wpos, .len = 0 },

        { .add = 0,        .len = 0 }

    };

    if (!dead) {

        return 0;

    }

    if (hw->wpos + dead > hw->samples) {

        bufs[0].len = (hw->samples - hw->wpos) << hwshift;

        bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;

    }

    else {

        bufs[0].len = dead << hwshift;

    }

    for (i = 0; i < 2; ++i) {

        ssize_t nread;

        if (bufs[i].len) {

            void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);

            nread = read (oss->fd, p, bufs[i].len);

            if (nread > 0) {

                if (nread & hw->info.align) {

                    dolog ("warning: Misaligned read %zd (requested %d), "

                           "alignment %d\n", nread, bufs[i].add << hwshift,

                           hw->info.align + 1);

                }

                read_samples += nread >> hwshift;

                hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,

                          &nominal_volume);

            }

            if (bufs[i].len - nread) {

                if (nread == -1) {

                    switch (errno) {

                    case EINTR:

                    case EAGAIN:

                        break;

                    default:

                        oss_logerr (

                            errno,

                            "Failed to read %d bytes of audio (to %p)\n",

                            bufs[i].len, p

                            );

                        break;

                    }

                }

                break;

            }

        }

    }

    hw->wpos = (hw->wpos + read_samples) % hw->samples;

    return read_samples;

}

static int oss_read (SWVoiceIn *sw, void *buf, int size)

{

    return audio_pcm_sw_read (sw, buf, size);

}

static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)

{

    OSSVoiceIn *oss = (OSSVoiceIn *) hw;

    switch (cmd) {

    case VOICE_ENABLE:

        {

            va_list ap;

            int poll_mode;

            va_start (ap, cmd);

            poll_mode = va_arg (ap, int);

            va_end (ap);

            if (poll_mode && oss_poll_in (hw)) {

                poll_mode = 0;

            }

            hw->poll_mode = poll_mode;

        }

        break;

    case VOICE_DISABLE:

        if (hw->poll_mode) {

            hw->poll_mode = 0;

            qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);

        }

        break;

    }

    return 0;

}

static void *oss_audio_init (void)

{

    return &conf;

}

static void oss_audio_fini (void *opaque)

{

    (void) opaque;

}

static struct audio_option oss_options[] = {

    {

        .name  = "FRAGSIZE",

        .tag   = AUD_OPT_INT,

        .valp  = &conf.fragsize,

        .descr = "Fragment size in bytes"

    },

    {

        .name  = "NFRAGS",

        .tag   = AUD_OPT_INT,

        .valp  = &conf.nfrags,

        .descr = "Number of fragments"

    },

    {

        .name  = "MMAP",

        .tag   = AUD_OPT_BOOL,

        .valp  = &conf.try_mmap,

        .descr = "Try using memory mapped access"

    },

    {

        .name  = "DAC_DEV",

        .tag   = AUD_OPT_STR,

        .valp  = &conf.devpath_out,

        .descr = "Path to DAC device"

    },

    {

        .name  = "ADC_DEV",

        .tag   = AUD_OPT_STR,

        .valp  = &conf.devpath_in,

        .descr = "Path to ADC device"

    },

    {

        .name  = "EXCLUSIVE",

        .tag   = AUD_OPT_BOOL,