rdpsnd_sgi.c

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/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Sound Channel Process Functions - SGI/IRIX
   Copyright (C) Matthew Chapman 2003
   Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
   Copyright (C) Jeremy Meng void.foo@gmail.com 2004, 2005
 
   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 <errno.h>
#include <dmedia/audio.h>
 
/* #define IRIX_DEBUG 1 */
 
#define IRIX_MAX_VOL     65535
 
#define MAX_QUEUE   10
 
int This->dsp_;
ALconfig audioconfig;
ALport output_port;
 
BOOL This->dsp_bu = False;
static BOOL g_swapaudio;
static int g_snd_rate;
static BOOL g_swapaudio;
static int width = AL_SAMPLE_16;
 
double min_volume, max_volume, volume_range;
int resource, maxFillable;
int combinedFrameSize;
 
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)
{
    ALparamInfo pinfo;
 
#if (defined(IRIX_DEBUG))
    fprintf(stderr, "wave_out_open: begin\n");
#endif
 
    if (alGetParamInfo(AL_DEFAULT_OUTPUT, AL_GAIN, &pinfo) < 0)
    {
        fprintf(stderr, "wave_out_open: alGetParamInfo failed: %s\n",
            alGetErrorString(oserror()));
    }
    min_volume = alFixedToDouble(pinfo.min.ll);
    max_volume = alFixedToDouble(pinfo.max.ll);
    volume_range = (max_volume - min_volume);
#if (defined(IRIX_DEBUG))
    fprintf(stderr, "wave_out_open: minvol = %lf, maxvol= %lf, range = %lf.\n",
        min_volume, max_volume, volume_range);
#endif
 
    queue_lo = queue_hi = 0;
 
    audioconfig = alNewConfig();
    if (audioconfig == (ALconfig) 0)
    {
        fprintf(stderr, "wave_out_open: alNewConfig failed: %s\n",
            alGetErrorString(oserror()));
        return False;
    }
 
    output_port = alOpenPort("rdpsnd", "w", 0);
    if (output_port == (ALport) 0)
    {
        fprintf(stderr, "wave_out_open: alOpenPort failed: %s\n",
            alGetErrorString(oserror()));
        return False;
    }
 
#if (defined(IRIX_DEBUG))
    fprintf(stderr, "wave_out_open: returning\n");
#endif
    return True;
}
 
void
wave_out_close(void)
{
    /* Ack all remaining packets */
#if (defined(IRIX_DEBUG))
    fprintf(stderr, "wave_out_close: begin\n");
#endif
 
    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;
    }
    alDiscardFrames(output_port, 0);
 
    alClosePort(output_port);
    alFreeConfig(audioconfig);
#if (defined(IRIX_DEBUG))
    fprintf(stderr, "wave_out_close: returning\n");
#endif
}
 
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 channels;
    int frameSize, channelCount;
    ALpv params;
 
#if (defined(IRIX_DEBUG))
    fprintf(stderr, "wave_out_set_format: init...\n");
#endif
 
    g_swapaudio = False;
    if (pwfx->wBitsPerSample == 8)
        width = AL_SAMPLE_8;
    else if (pwfx->wBitsPerSample == 16)
    {
        width = AL_SAMPLE_16;
        /* Do we need to swap the 16bit values? (Are we BigEndian) */
#if (defined(B_ENDIAN))
        g_swapaudio = 1;
#else
        g_swapaudio = 0;
#endif
    }
 
    /* Limited support to configure an opened audio port in IRIX.  The
       number of channels is a static setting and can not be changed after
       a port is opened.  So if the number of channels remains the same, we
       can configure other settings; otherwise we have to reopen the audio
       port, using same config. */
 
    channels = pwfx->nChannels;
    g_snd_rate = pwfx->nSamplesPerSec;
 
    alSetSampFmt(audioconfig, AL_SAMPFMT_TWOSCOMP);
    alSetWidth(audioconfig, width);
    if (channels != alGetChannels(audioconfig))
    {
        alClosePort(output_port);
        alSetChannels(audioconfig, channels);
        output_port = alOpenPort("rdpsnd", "w", audioconfig);
 
        if (output_port == (ALport) 0)
        {
            fprintf(stderr, "wave_out_set_format: alOpenPort failed: %s\n",
                alGetErrorString(oserror()));
            return False;
        }
 
    }
 
    resource = alGetResource(output_port);
    maxFillable = alGetFillable(output_port);
    channelCount = alGetChannels(audioconfig);
    frameSize = alGetWidth(audioconfig);
 
    if (frameSize == 0 || channelCount == 0)
    {
        fprintf(stderr, "wave_out_set_format: bad frameSize or channelCount\n");
        return False;
    }
    combinedFrameSize = frameSize * channelCount;
 
    params.param = AL_RATE;
    params.value.ll = (long long) g_snd_rate << 32;
 
    if (alSetParams(resource, &params, 1) < 0)
    {
        fprintf(stderr, "wave_set_format: alSetParams failed: %s\n",
            alGetErrorString(oserror()));
        return False;
    }
    if (params.sizeOut < 0)
    {
        fprintf(stderr, "wave_set_format: invalid rate %d\n", g_snd_rate);
        return False;
    }
 
#if (defined(IRIX_DEBUG))
    fprintf(stderr, "wave_out_set_format: returning...\n");
#endif
    return True;
}
 
void
wave_out_volume(uint16 left, uint16 right)
{
    double gainleft, gainright;
    ALpv pv[1];
    ALfixed gain[8];
 
#if (defined(IRIX_DEBUG))
    fprintf(stderr, "wave_out_volume: begin\n");
    fprintf(stderr, "left='%d', right='%d'\n", left, right);
#endif
 
    gainleft = (double) left / IRIX_MAX_VOL;
    gainright = (double) right / IRIX_MAX_VOL;
 
    gain[0] = alDoubleToFixed(min_volume + gainleft * volume_range);
    gain[1] = alDoubleToFixed(min_volume + gainright * volume_range);
 
    pv[0].param = AL_GAIN;
    pv[0].value.ptr = gain;
    pv[0].sizeIn = 8;
    if (alSetParams(AL_DEFAULT_OUTPUT, pv, 1) < 0)
    {
        fprintf(stderr, "wave_out_volume: alSetParams failed: %s\n",
            alGetErrorString(oserror()));
        return;
    }
 
#if (defined(IRIX_DEBUG))
    fprintf(stderr, "wave_out_volume: returning\n");
#endif
}
 
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)
    {
        fprintf(stderr, "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;
    ssize_t len;
    unsigned int i;
    uint8 swap;
    STREAM out;
    static BOOL swapped = False;
    int gf;
 
    while (1)
    {
        if (queue_lo == queue_hi)
        {
            This->dsp_bu = False;
            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;
        }
 
        len = out->end - out->p;
 
        alWriteFrames(output_port, out->p, len / combinedFrameSize);
 
        out->p += len;
        if (out->p == out->end)
        {
            gf = alGetFilled(output_port);
            if (gf < (4 * maxFillable / 10))
            {
                rdpsnd_send_completion(packet->tick, packet->index);
                free(out->data);
                queue_lo = (queue_lo + 1) % MAX_QUEUE;
                swapped = False;
            }
            else
            {
#if (defined(IRIX_DEBUG))
/*                  fprintf(stderr,"Busy playing...\n"); */
#endif
                This->dsp_bu = True;
                usleep(10);
                return;
            }
        }
    }
}