source: vbox/trunk/src/VBox/RDP/client/rdpsnd_oss.c@ 52901

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Sound Channel Process Functions - Open Sound System
   Copyright (C) Matthew Chapman <matthewc.unsw.edu.au> 2003-2008
   Copyright (C) GuoJunBo <guojunbo@ict.ac.cn> 2003
   Copyright 2006-2008 Pierre Ossman <ossman@cendio.se> for Cendio AB
   Copyright 2005-2011 Peter Astrand <astrand@cendio.se> for Cendio AB

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/*
 * Oracle GPL Disclaimer: For the avoidance of doubt, except that if any license choice
 * other than GPL or LGPL is available it will apply instead, Oracle elects to use only
 * the General Public License version 2 (GPLv2) at this time for any software where
 * a choice of GPL license versions is made available with the language indicating
 * that GPLv2 or any later version may be used, or where a choice of which version
 * of the GPL is applied is otherwise unspecified.
 */

/* 
   This is a workaround for Esound bug 312665. 
   FIXME: Remove this when Esound is fixed. 
*/
#ifdef _FILE_OFFSET_BITS
#undef _FILE_OFFSET_BITS
#endif

#include <assert.h>

#include "rdesktop.h"
#include "rdpsnd.h"
#include "rdpsnd_dsp.h"
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include <sys/types.h>
#include <sys/stat.h>

#define DEFAULTDEVICE   "/dev/dsp"
#define MAX_LEN         512

static int dsp_fd = -1;
static int dsp_mode;

static RD_BOOL dsp_configured;
static RD_BOOL dsp_broken;

static int stereo;
static int format;
static uint32 snd_rate;
static short samplewidth;
static char *dsp_dev;
static RD_BOOL in_esddsp;

/* This is a just a forward declaration */
static struct audio_driver oss_driver;

static void oss_play(void);
static void oss_record(void);
static RD_BOOL oss_set_format(RD_WAVEFORMATEX * pwfx);

static void
oss_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv)
{
        if (dsp_fd == -1)
                return;

        if ((dsp_mode == O_WRONLY || dsp_mode == O_RDWR) && !rdpsnd_queue_empty())
                FD_SET(dsp_fd, wfds);
        if (dsp_mode == O_RDONLY || dsp_mode == O_RDWR)
                FD_SET(dsp_fd, rfds);
        if (dsp_fd > *n)
                *n = dsp_fd;
}

static void
oss_check_fds(fd_set * rfds, fd_set * wfds)
{
        if (FD_ISSET(dsp_fd, wfds))
                oss_play();
        if (FD_ISSET(dsp_fd, rfds))
                oss_record();
}

static RD_BOOL
detect_esddsp(void)
{
        struct stat s;
        char *preload;

        if (fstat(dsp_fd, &s) == -1)
                return False;

        if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode))
                return False;

        preload = getenv("LD_PRELOAD");
        if (preload == NULL)
                return False;

        if (strstr(preload, "esddsp") == NULL)
                return False;

        return True;
}


static void
oss_restore_format()
{
        RD_WAVEFORMATEX wfx;
        memset(&wfx, 0, sizeof(RD_WAVEFORMATEX));
        switch (format)
        {
                case AFMT_U8:
                        wfx.wBitsPerSample = 8;
                        break;
                case AFMT_S16_LE:
                        wfx.wBitsPerSample = 16;
                        break;
                default:
                        wfx.wBitsPerSample = 0;
        }
        wfx.nChannels = stereo ? 2 : 1;
        wfx.nSamplesPerSec = snd_rate;
        oss_set_format(&wfx);
}


static RD_BOOL
oss_open(int wanted)
{
        if (dsp_fd != -1)
        {
                if (wanted == dsp_mode)
                {
                        /* should probably not happen */
                        return True;
                }
                else
                {
                        /* device open but not our mode. Before
                           reopening O_RDWR, verify that the device is
                           duplex capable */
                        int caps;
                        ioctl(dsp_fd, SNDCTL_DSP_SETDUPLEX, 0);
                        if ((ioctl(dsp_fd, SNDCTL_DSP_GETCAPS, &caps) < 0)
                            || !(caps & DSP_CAP_DUPLEX))
                        {
                                warning("This device is not capable of full duplex operation.\n");
                                return False;
                        }
                        close(dsp_fd);
                        dsp_mode = O_RDWR;
                }
        }
        else
        {
                dsp_mode = wanted;
        }

        dsp_configured = False;
        dsp_broken = False;

        dsp_fd = open(dsp_dev, dsp_mode | O_NONBLOCK);

        if (dsp_fd == -1)
        {
                perror(dsp_dev);
                return False;
        }

        in_esddsp = detect_esddsp();

        return True;
}

static void
oss_close(void)
{
        close(dsp_fd);
        dsp_fd = -1;
}

static RD_BOOL
oss_open_out(void)
{
        if (!oss_open(O_WRONLY))
                return False;

        return True;
}

static void
oss_close_out(void)
{
        oss_close();
        if (dsp_mode == O_RDWR)
        {
                if (oss_open(O_RDONLY))
                        oss_restore_format();
        }

        /* Ack all remaining packets */
        while (!rdpsnd_queue_empty())
                rdpsnd_queue_next(0);
}

static RD_BOOL
oss_open_in(void)
{
        if (!oss_open(O_RDONLY))
                return False;

        return True;
}

static void
oss_close_in(void)
{
        oss_close();
        if (dsp_mode == O_RDWR)
        {
                if (oss_open(O_WRONLY))
                        oss_restore_format();
        }
}

static RD_BOOL
oss_format_supported(RD_WAVEFORMATEX * pwfx)
{
        if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
                return False;
        if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
                return False;
        if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
                return False;

        return True;
}

static RD_BOOL
oss_set_format(RD_WAVEFORMATEX * pwfx)
{
        int fragments;
        static RD_BOOL driver_broken = False;

        assert(dsp_fd != -1);

        if (dsp_configured)
        {
                if ((pwfx->wBitsPerSample == 8) && (format != AFMT_U8))
                        return False;
                if ((pwfx->wBitsPerSample == 16) && (format != AFMT_S16_LE))
                        return False;

                if ((pwfx->nChannels == 2) != ! !stereo)
                        return False;

                if (pwfx->nSamplesPerSec != snd_rate)
                        return False;

                return True;
        }

        ioctl(dsp_fd, SNDCTL_DSP_RESET, NULL);
        ioctl(dsp_fd, SNDCTL_DSP_SYNC, NULL);

        if (pwfx->wBitsPerSample == 8)
                format = AFMT_U8;
        else if (pwfx->wBitsPerSample == 16)
                format = AFMT_S16_LE;

        samplewidth = pwfx->wBitsPerSample / 8;

        if (ioctl(dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
        {
                perror("SNDCTL_DSP_SETFMT");
                oss_close();
                return False;
        }

        if (pwfx->nChannels == 2)
        {
                stereo = 1;
                samplewidth *= 2;
        }
        else
        {
                stereo = 0;
        }

        if (ioctl(dsp_fd, SNDCTL_DSP_STEREO, &stereo) == -1)
        {
                perror("SNDCTL_DSP_CHANNELS");
                oss_close();
                return False;
        }

        oss_driver.need_resampling = 0;
        snd_rate = pwfx->nSamplesPerSec;
        if (ioctl(dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1)
        {
                uint32 rates[] = { 44100, 48000, 0 };
                uint32 *prates = rates;

                while (*prates != 0)
                {
                        if ((pwfx->nSamplesPerSec != *prates)
                            && (ioctl(dsp_fd, SNDCTL_DSP_SPEED, prates) != -1))
                        {
                                oss_driver.need_resampling = 1;
                                snd_rate = *prates;
                                if (rdpsnd_dsp_resample_set
                                    (snd_rate, pwfx->wBitsPerSample, pwfx->nChannels) == False)
                                {
                                        error("rdpsnd_dsp_resample_set failed");
                                        oss_close();
                                        return False;
                                }

                                break;
                        }
                        prates++;
                }

                if (*prates == 0)
                {
                        perror("SNDCTL_DSP_SPEED");
                        oss_close();
                        return False;
                }
        }

        /* try to get 12 fragments of 2^12 bytes size */
        fragments = (12 << 16) + 12;
        ioctl(dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments);

        if (!driver_broken)
        {
                audio_buf_info info;

                memset(&info, 0, sizeof(info));
                if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
                {
                        perror("SNDCTL_DSP_GETOSPACE");
                        oss_close();
                        return False;
                }

                if (info.fragments == 0 || info.fragstotal == 0 || info.fragsize == 0)
                {
                        fprintf(stderr,
                                "Broken OSS-driver detected: fragments: %d, fragstotal: %d, fragsize: %d\n",
                                info.fragments, info.fragstotal, info.fragsize);
                        driver_broken = True;
                }
        }

        dsp_configured = True;

        return True;
}

static void
oss_volume(uint16 left, uint16 right)
{
        uint32 volume;

        volume = left / (65536 / 100);
        volume |= right / (65536 / 100) << 8;

        if (ioctl(dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
        {
                warning("hardware volume control unavailable, falling back to software volume control!\n");
                oss_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
                rdpsnd_dsp_softvol_set(left, right);
                return;
        }
}

static void
oss_play(void)
{
        struct audio_packet *packet;
        ssize_t len;
        STREAM out;

        assert(dsp_fd != -1);

        /* We shouldn't be called if the queue is empty, but still */
        if (rdpsnd_queue_empty())
                return;

        packet = rdpsnd_queue_current_packet();
        out = &packet->s;

        len = out->end - out->p;

        len = write(dsp_fd, out->p, (len > MAX_LEN) ? MAX_LEN : len);
        if (len == -1)
        {
                if (errno != EWOULDBLOCK)
                {
                        if (!dsp_broken)
                                perror("RDPSND: write()");
                        dsp_broken = True;
                        rdpsnd_queue_next(0);
                }
                return;
        }

        dsp_broken = False;

        out->p += len;

        if (out->p == out->end)
        {
                int delay_bytes;
                unsigned long delay_us;
                audio_buf_info info;

                if (in_esddsp)
                {
                        /* EsounD has no way of querying buffer status, so we have to
                         * go with a fixed size. */
                        delay_bytes = out->size;
                }
                else
                {
#ifdef SNDCTL_DSP_GETODELAY
                        delay_bytes = 0;
                        if (ioctl(dsp_fd, SNDCTL_DSP_GETODELAY, &delay_bytes) == -1)
                                delay_bytes = -1;
#else
                        delay_bytes = -1;
#endif

                        if (delay_bytes == -1)
                        {
                                if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) != -1)
                                        delay_bytes = info.fragstotal * info.fragsize - info.bytes;
                                else
                                        delay_bytes = out->size;
                        }
                }

                delay_us = delay_bytes * (1000000 / (samplewidth * snd_rate));
                rdpsnd_queue_next(delay_us);
        }
}

static void
oss_record(void)
{
        char buffer[32768];
        int len;

        assert(dsp_fd != -1);

        len = read(dsp_fd, buffer, sizeof(buffer));
        if (len == -1)
        {
                if (errno != EWOULDBLOCK)
                {
                        if (!dsp_broken)
                                perror("RDPSND: read()");
                        dsp_broken = True;
                        rdpsnd_queue_next(0);
                }
                return;
        }

        dsp_broken = False;

        rdpsnd_record(buffer, len);
}

struct audio_driver *
oss_register(char *options)
{
        memset(&oss_driver, 0, sizeof(oss_driver));

        oss_driver.name = "oss";
        oss_driver.description =
                "OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV";

        oss_driver.add_fds = oss_add_fds;
        oss_driver.check_fds = oss_check_fds;

        oss_driver.wave_out_open = oss_open_out;
        oss_driver.wave_out_close = oss_close_out;
        oss_driver.wave_out_format_supported = oss_format_supported;
        oss_driver.wave_out_set_format = oss_set_format;
        oss_driver.wave_out_volume = oss_volume;

        oss_driver.wave_in_open = oss_open_in;
        oss_driver.wave_in_close = oss_close_in;
        oss_driver.wave_in_format_supported = oss_format_supported;
        oss_driver.wave_in_set_format = oss_set_format;
        oss_driver.wave_in_volume = NULL;       /* FIXME */

        oss_driver.need_byteswap_on_be = 0;
        oss_driver.need_resampling = 0;

        if (options)
        {
                dsp_dev = xstrdup(options);
        }
        else
        {
                dsp_dev = getenv("AUDIODEV");

                if (dsp_dev == NULL)
                {
                        dsp_dev = DEFAULTDEVICE;
                }
        }

        return &oss_driver;
}