rdpsnd_sun.c

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/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Sound Channel Process Functions - Sun
   Copyright (C) Matthew Chapman 2003
   Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
   Copyright (C) Michael Gernoth mike@zerfleddert.de 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.
*/
 
#include "rdesktop.h"
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/audioio.h>
 
#if (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
#include <stropts.h>
#endif
 
#define MAX_QUEUE   10
 
int This->dsp_;
BOOL This->dsp_bu = False;
static BOOL g_reopened;
static BOOL g_swapaudio;
static short g_samplewidth;
 
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/audio");
    }
 
    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);
 
    queue_lo = queue_hi = 0;
    g_reopened = True;
 
    return True;
}
 
void
wave_out_close(void)
{
    /* Ack all remaining packets */
    while (queue_lo != queue_hi)
    {
        rdpsnd_send_completion(packet_queue[queue_lo].tick, packet_queue[queue_lo].index);
        free(packet_queue[queue_lo].s.data);
        queue_lo = (queue_lo + 1) % MAX_QUEUE;
    }
 
#if defined I_FLUSH && defined FLUSHW
    /* Flush the audiobuffer */
    ioctl(This->dsp_, I_FLUSH, FLUSHW);
#endif
#if defined AUDIO_FLUSH
    ioctl(This->dsp_, AUDIO_FLUSH, NULL);
#endif
    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)
{
    audio_info_t info;
 
    ioctl(This->dsp_, AUDIO_DRAIN, 0);
    g_swapaudio = False;
    AUDIO_INITINFO(&info);
 
 
    if (pwfx->wBitsPerSample == 8)
    {
        info.play.encoding = AUDIO_ENCODING_LINEAR8;
    }
    else if (pwfx->wBitsPerSample == 16)
    {
        info.play.encoding = AUDIO_ENCODING_LINEAR;
        /* Do we need to swap the 16bit values? (Are we BigEndian) */
#ifdef B_ENDIAN
        g_swapaudio = 1;
#else
        g_swapaudio = 0;
#endif
    }
 
    g_samplewidth = pwfx->wBitsPerSample / 8;
 
    if (pwfx->nChannels == 1)
    {
        info.play.channels = 1;
    }
    else if (pwfx->nChannels == 2)
    {
        info.play.channels = 2;
        g_samplewidth *= 2;
    }
 
    info.play.sample_rate = pwfx->nSamplesPerSec;
    info.play.precision = pwfx->wBitsPerSample;
    info.play.samples = 0;
    info.play.eof = 0;
    info.play.error = 0;
    g_reopened = True;
 
    if (ioctl(This->dsp_, AUDIO_SETINFO, &info) == -1)
    {
        perror("AUDIO_SETINFO");
        close(This->dsp_);
        return False;
    }
 
    return True;
}
 
void
wave_out_volume(uint16 left, uint16 right)
{
    audio_info_t info;
    uint balance;
    uint volume;
 
    AUDIO_INITINFO(&info);
 
    volume = (left > right) ? left : right;
 
    if (volume / AUDIO_MID_BALANCE != 0)
    {
        balance =
            AUDIO_MID_BALANCE - (left / (volume / AUDIO_MID_BALANCE)) +
            (right / (volume / AUDIO_MID_BALANCE));
    }
    else
    {
        balance = AUDIO_MID_BALANCE;
    }
 
    info.play.gain = volume / (65536 / AUDIO_MAX_GAIN);
    info.play.balance = balance;
 
    if (ioctl(This->dsp_, AUDIO_SETINFO, &info) == -1)
    {
        perror("AUDIO_SETINFO");
        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 = malloc(s->size);
 
    if (!This->dsp_bu)
        wave_out_play();
}
 
void
wave_out_play(void)
{
    struct audio_packet *packet;
    audio_info_t info;
    ssize_t len;
    unsigned int i;
    uint8 swap;
    STREAM out;
    static BOOL swapped = False;
    static BOOL sentcompletion = True;
    static uint32 samplecnt = 0;
    static uint32 numsamples;
 
    while (1)
    {
        if (g_reopened)
        {
            /* Device was just (re)openend */
            samplecnt = 0;
            swapped = False;
            sentcompletion = True;
            g_reopened = False;
        }
 
        if (queue_lo == queue_hi)
        {
            This->dsp_bu = 0;
            return;
        }
 
        packet = &packet_queue[queue_lo];
        out = &packet->s;
 
        /* Swap the current packet, but only once */
        if (g_swapaudio && !swapped)
        {
            for (i = 0; i < out->end - out->p; i += 2)
            {
                swap = *(out->p + i);
                *(out->p + i) = *(out->p + i + 1);
                *(out->p + i + 1) = swap;
            }
            swapped = True;
        }
 
        if (sentcompletion)
        {
            sentcompletion = False;
            numsamples = (out->end - out->p) / g_samplewidth;
        }
 
        len = 0;
 
        if (out->end != out->p)
        {
            len = write(This->dsp_, out->p, out->end - out->p);
            if (len == -1)
            {
                if (errno != EWOULDBLOCK)
                    perror("write audio");
                This->dsp_bu = 1;
                return;
            }
        }
 
        out->p += len;
        if (out->p == out->end)
        {
            if (ioctl(This->dsp_, AUDIO_GETINFO, &info) == -1)
            {
                perror("AUDIO_GETINFO");
                return;
            }
 
            /* Ack the packet, if we have played at least 70% */
            if (info.play.samples >= samplecnt + ((numsamples * 7) / 10))
            {
                samplecnt += numsamples;
                rdpsnd_send_completion(packet->tick, packet->index);
                free(out->data);
                queue_lo = (queue_lo + 1) % MAX_QUEUE;
                swapped = False;
                sentcompletion = True;
            }
            else
            {
                This->dsp_bu = 1;
                return;
            }
        }
    }
}