rdpsnd_oss.c

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/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Sound Channel Process Functions - Open Sound System
   Copyright (C) Matthew Chapman 2003
   Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
 
   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 2 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, write to the Free Software Foundation, Inc.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
 
/*
   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 "rdesktop.h"
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
 
#define MAX_QUEUE   10
 
int This->dsp_;
BOOL This->dsp_bu = False;
static int g_snd_rate;
static short g_samplewidth;
static BOOL g_driver_broken = False;
 
static struct audio_packet
{
    struct stream s;
    uint16 tick;
    uint8 index;
} packet_queue[MAX_QUEUE];
static unsigned int queue_hi, queue_lo;
 
BOOL
wave_out_open(void)
{
    char *dsp_dev = getenv("AUDIODEV");
 
    if (dsp_dev == NULL)
    {
        dsp_dev = xstrdup("/dev/dsp");
    }
 
    if ((This->dsp_ = open(dsp_dev, O_WRONLY | O_NONBLOCK)) == -1)
    {
        perror(dsp_dev);
        return False;
    }
 
    /* Non-blocking so that user interface is responsive */
    fcntl(This->dsp_, F_SETFL, fcntl(This->dsp_, F_GETFL) | O_NONBLOCK);
    return True;
}
 
void
wave_out_close(void)
{
    close(This->dsp_);
}
 
BOOL
wave_out_format_supported(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;
}
 
BOOL
wave_out_set_format(WAVEFORMATEX * pwfx)
{
    int stereo, format, fragments;
 
    ioctl(This->dsp_, SNDCTL_DSP_RESET, NULL);
    ioctl(This->dsp_, SNDCTL_DSP_SYNC, NULL);
 
    if (pwfx->wBitsPerSample == 8)
        format = AFMT_U8;
    else if (pwfx->wBitsPerSample == 16)
        format = AFMT_S16_LE;
 
    g_samplewidth = pwfx->wBitsPerSample / 8;
 
    if (ioctl(This->dsp_, SNDCTL_DSP_SETFMT, &format) == -1)
    {
        perror("SNDCTL_DSP_SETFMT");
        close(This->dsp_);
        return False;
    }
 
    if (pwfx->nChannels == 2)
    {
        stereo = 1;
        g_samplewidth *= 2;
    }
    else
    {
        stereo = 0;
    }
 
    if (ioctl(This->dsp_, SNDCTL_DSP_STEREO, &stereo) == -1)
    {
        perror("SNDCTL_DSP_CHANNELS");
        close(This->dsp_);
        return False;
    }
 
    g_snd_rate = pwfx->nSamplesPerSec;
    if (ioctl(This->dsp_, SNDCTL_DSP_SPEED, &g_snd_rate) == -1)
    {
        perror("SNDCTL_DSP_SPEED");
        close(This->dsp_);
        return False;
    }
 
    /* try to get 7 fragments of 2^12 bytes size */
    fragments = (7 << 16) + 12;
    ioctl(This->dsp_, SNDCTL_DSP_SETFRAGMENT, &fragments);
 
    if (!g_driver_broken)
    {
        audio_buf_info info;
 
        memset(&info, 0, sizeof(info));
        if (ioctl(This->dsp_, SNDCTL_DSP_GETOSPACE, &info) == -1)
        {
            perror("SNDCTL_DSP_GETOSPACE");
            close(This->dsp_);
            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);
            g_driver_broken = True;
        }
    }
 
    return True;
}
 
void
wave_out_volume(uint16 left, uint16 right)
{
    static BOOL use_dev_mixer = False;
    uint32 volume;
    int fd_mix = -1;
 
    volume = left / (65536 / 100);
    volume |= right / (65536 / 100) << 8;
 
    if (use_dev_mixer)
    {
        if ((fd_mix = open("/dev/mixer", O_RDWR | O_NONBLOCK)) == -1)
        {
            perror("open /dev/mixer");
            return;
        }
 
        if (ioctl(fd_mix, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
        {
            perror("MIXER_WRITE(SOUND_MIXER_PCM)");
            return;
        }
 
        close(fd_mix);
    }
 
    if (ioctl(This->dsp_, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
    {
        perror("MIXER_WRITE(SOUND_MIXER_PCM)");
        use_dev_mixer = True;
        return;
    }
}
 
void
wave_out_write(STREAM s, uint16 tick, uint8 index)
{
    struct audio_packet *packet = &packet_queue[queue_hi];
    unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
 
    if (next_hi == queue_lo)
    {
        error("No space to queue audio packet\n");
        return;
    }
 
    queue_hi = next_hi;
 
    packet->s = *s;
    packet->tick = tick;
    packet->index = index;
    packet->s.p += 4;
 
    /* we steal the data buffer from s, give it a new one */
    s->data = (uint8 *) malloc(s->size);
 
    if (!This->dsp_bu)
        wave_out_play();
}
 
void
wave_out_play(void)
{
    struct audio_packet *packet;
    ssize_t len;
    STREAM out;
    static long startedat_us;
    static long startedat_s;
    static BOOL started = False;
    struct timeval tv;
    audio_buf_info info;
 
    while (1)
    {
        if (queue_lo == queue_hi)
        {
            This->dsp_bu = 0;
            return;
        }
 
        packet = &packet_queue[queue_lo];
        out = &packet->s;
 
        if (!started)
        {
            gettimeofday(&tv, NULL);
            startedat_us = tv.tv_usec;
            startedat_s = tv.tv_sec;
            started = True;
        }
 
        len = out->end - out->p;
 
        if (!g_driver_broken)
        {
            memset(&info, 0, sizeof(info));
            if (ioctl(This->dsp_, SNDCTL_DSP_GETOSPACE, &info) == -1)
            {
                perror("SNDCTL_DSP_GETOSPACE");
                return;
            }
 
            if (info.fragments == 0)
            {
                This->dsp_bu = 1;
                return;
            }
 
            if (info.fragments * info.fragsize < len
                && info.fragments * info.fragsize > 0)
            {
                len = info.fragments * info.fragsize;
            }
        }
 
 
        len = write(This->dsp_, out->p, len);
        if (len == -1)
        {
            if (errno != EWOULDBLOCK)
                perror("write audio");
            This->dsp_bu = 1;
            return;
        }
 
        out->p += len;
        if (out->p == out->end)
        {
            long long duration;
            long elapsed;
 
            gettimeofday(&tv, NULL);
            duration = (out->size * (1000000 / (g_samplewidth * g_snd_rate)));
            elapsed = (tv.tv_sec - startedat_s) * 1000000 + (tv.tv_usec - startedat_us);
 
            if (elapsed >= (duration * 85) / 100)
            {
                rdpsnd_send_completion(packet->tick, packet->index);
                free(out->data);
                queue_lo = (queue_lo + 1) % MAX_QUEUE;
                started = False;
            }
            else
            {
                This->dsp_bu = 1;
                return;
            }
        }
    }
}