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

Include dependency graph for rdpsnd_oss.c:

Go to the source code of this file.

Classes
struct	audio_packet

Macros
#define	MAX_QUEUE 10

Functions
BOOL	wave_out_open (void)

void	wave_out_close (void)

BOOL	wave_out_format_supported (WAVEFORMATEX *pwfx)

BOOL	wave_out_set_format (WAVEFORMATEX *pwfx)

void	wave_out_volume (uint16 left, uint16 right)

void	wave_out_write (STREAM s, uint16 tick, uint8 index)

void	wave_out_play (void)

Variables
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	packet_queue [MAX_QUEUE]

static unsigned int	queue_hi

static unsigned int	queue_lo

Macro Definition Documentation

◆ MAX_QUEUE

#define MAX_QUEUE 10

Definition at line 38 of file rdpsnd_oss.c.

Function Documentation

◆ wave_out_close()

void wave_out_close ( void )

Definition at line 76 of file rdpsnd_oss.c.

{
    close(This->dsp_);
}

◆ wave_out_format_supported()

BOOL wave_out_format_supported ( WAVEFORMATEX * pwfx )

Definition at line 82 of file rdpsnd_oss.c.

{
    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;
}

◆ wave_out_open()

BOOL wave_out_open ( void )

Definition at line 55 of file rdpsnd_oss.c.

{
    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;
}

◆ wave_out_play()

void wave_out_play ( void )

Definition at line 231 of file rdpsnd_oss.c.

{
    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;
            }
        }
    }
}

Referenced by wave_out_write().

◆ wave_out_set_format()

BOOL wave_out_set_format ( WAVEFORMATEX * pwfx )

Definition at line 95 of file rdpsnd_oss.c.

{
    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;
}

◆ wave_out_volume()

void wave_out_volume	(	uint16	left,
		uint16	right
	)

Definition at line 170 of file rdpsnd_oss.c.

{
    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;
    }
}

◆ wave_out_write()

void wave_out_write	(	STREAM	s,
		uint16	tick,
		uint8	index
	)

Definition at line 205 of file rdpsnd_oss.c.

{
    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();
}