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Date:      Wed, 29 Dec 1999 00:58:10 -0500
From:      "Charles Anderson" <caa@columbus.rr.com>
To:        freebsd-multimedia@freebsd.org, FreeBSD Current <freebsd-current@freebsd.org>
Subject:   mmaping /dev/dsp problems
Message-ID:  <19991229005714.C79763@midgard.dhs.org>

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Hello,
I'm trying to get the quake 1 source to compile and work under freebsd with glx.

Most of the graphics parts work, and I can play, but I can't seem to get it to
mmap the dsp dma buffer like it wants to.

I have ripped out part of the code to demonstrate the problem.  All I had to
change to get it to compile this was to include machine/soundcard.h instead of
linux/soundcard.h, but that doesn't seem to be enough to get it to work.

I'm running -current with newpcm as of Dec 13, I know it's not the latest, but
not much has changed in the dsp code lately.  I'll build a new world tomorrow,
and try it out.

I have attached the files snd_linux.c & sound.h 
When I run snd_linux I get
opening /dev/dsp
audio_fd /dev/dsp=3
about to map 63488 bytes to /dev/dsp
shm->buffer=280eb000
Segmentation fault (core dumped)
bash-2.02$                       

gdb has this to say about shm->buffer (what mmap returns)
$3 = (
    unsigned char *) 0x280eb000 <Error reading address 0x280eb000: Bad address>

Thanks, for any help.
-Charlie
-- 
Charles Anderson	caa@columbus.rr.com

No quote, no nothin'

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Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename="snd_linux.c"

/*
Copyright (C) 1996-1997 Id Software, Inc.

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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <machine/soundcard.h>
#include <stdio.h>
#include "sound.h"

int audio_fd;
int snd_inited;

static int tryrates[] = { 11025, 22051, 44100, 8000 };

#define Con_Printf printf

dma_t *shm;

qboolean SNDDMA_Init(void)
{

	dma_t sn;
	int rc;
    int fmt;
	int tmp;
    int i;
    char *s;
	struct audio_buf_info info;
	int caps;

	snd_inited = 0;

// open /dev/dsp, confirm capability to mmap, and get size of dma buffer

Con_Printf("opening /dev/dsp\n");
    audio_fd = open("/dev/dsp", O_RDWR);
    if (audio_fd < 0)
	{
		perror("/dev/dsp");
        Con_Printf("Could not open /dev/dsp\n");
		return 0;
	}
Con_Printf("audio_fd /dev/dsp=%d\n", audio_fd);

    rc = ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
    if (rc < 0)
	{
		perror("/dev/dsp");
		Con_Printf("Could not reset /dev/dsp\n");
		close(audio_fd);
		return 0;
	}

	if (ioctl(audio_fd, SNDCTL_DSP_GETCAPS, &caps)==-1)
	{
		perror("/dev/dsp");
        Con_Printf("Sound driver too old\n");
		close(audio_fd);
		return 0;
	}

	if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP))
	{
		Con_Printf("Sorry but your soundcard can't do this\n");
		close(audio_fd);
		return 0;
	}

    if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info)==-1)
    {   
        perror("GETOSPACE");
		Con_Printf("Um, can't do GETOSPACE?\n");
		close(audio_fd);
		return 0;
    }
    
	shm = &sn;
    shm->splitbuffer = 0;

// set sample bits & speed

    s = getenv("QUAKE_SOUND_SAMPLEBITS");
    if (s) shm->samplebits = atoi(s);
/*	else if ((i = COM_CheckParm("-sndbits")) != 0)
		shm->samplebits = atoi(com_argv[i+1]); */
	if (shm->samplebits != 16 && shm->samplebits != 8)
    {
        ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &fmt);
        if (fmt & AFMT_S16_LE) shm->samplebits = 16;
        else if (fmt & AFMT_U8) shm->samplebits = 8;
    }

    s = getenv("QUAKE_SOUND_SPEED");
    if (s) shm->speed = atoi(s);
/*	else if ((i = COM_CheckParm("-sndspeed")) != 0)
		shm->speed = atoi(com_argv[i+1]); */
    else
    {
        for (i=0 ; i<sizeof(tryrates)/4 ; i++)
            if (!ioctl(audio_fd, SNDCTL_DSP_SPEED, &tryrates[i])) break;
        shm->speed = tryrates[i];
    }

    s = getenv("QUAKE_SOUND_CHANNELS");
    if (s) shm->channels = atoi(s);
/*	else if ((i = COM_CheckParm("-sndmono")) != 0)
		shm->channels = 1;
	else if ((i = COM_CheckParm("-sndstereo")) != 0)
		shm->channels = 2; */
    else shm->channels = 2;

	shm->samples = info.fragstotal * info.fragsize / (shm->samplebits/8);
	shm->submission_chunk = 1;

// memory map the dma buffer

Con_Printf("about to map %d bytes to /dev/dsp\n", info.fragstotal * info.fragsize);
	shm->buffer = (unsigned char *) mmap(NULL, info.fragstotal
		* info.fragsize, PROT_WRITE, MAP_SHARED, audio_fd, 0);
	if (!shm->buffer || shm->buffer == (unsigned char *)-1)
	{
		perror("/dev/dsp");
		Con_Printf("Could not mmap /dev/dsp\n");
		close(audio_fd);
		return 0;
	}
Con_Printf("shm->buffer=%lx\n", shm->buffer);

	tmp = 0;
	if (shm->channels == 2)
		tmp = 1;
    rc = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
    if (rc < 0)
    {
		perror("/dev/dsp");
        Con_Printf("Could not set /dev/dsp to stereo=%d", shm->channels);
		close(audio_fd);
        return 0;
    }
	if (tmp)
		shm->channels = 2;
	else
		shm->channels = 1;

    rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &shm->speed);
    if (rc < 0)
    {
		perror("/dev/dsp");
        Con_Printf("Could not set /dev/dsp speed to %d", shm->speed);
		close(audio_fd);
        return 0;
    }

    if (shm->samplebits == 16)
    {
        rc = AFMT_S16_LE;
        rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
        if (rc < 0)
		{
			perror("/dev/dsp");
			Con_Printf("Could not support 16-bit data.  Try 8-bit.\n");
			close(audio_fd);
			return 0;
		}
    }
    else if (shm->samplebits == 8)
    {
        rc = AFMT_U8;
        rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
        if (rc < 0)
		{
			perror("/dev/dsp");
			Con_Printf("Could not support 8-bit data.\n");
			close(audio_fd);
			return 0;
		}
    }
	else
	{
		perror("/dev/dsp");
		Con_Printf("%d-bit sound not supported.", shm->samplebits);
		close(audio_fd);
		return 0;
	}

// toggle the trigger & start her up

    tmp = 0;
    rc  = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
	if (rc < 0)
	{
		perror("/dev/dsp");
		Con_Printf("Could not toggle.\n");
		close(audio_fd);
		return 0;
	}
    tmp = PCM_ENABLE_OUTPUT;
    rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
	if (rc < 0)
	{
		perror("/dev/dsp");
		Con_Printf("Could not toggle.\n");
		close(audio_fd);
		return 0;
	}

	shm->samplepos = 0;

	snd_inited = 1;
	return 1;

}

main()
{
	SNDDMA_Init();
	memset(shm->buffer, 0, 2048);
}

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Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename="sound.h"

/*
Copyright (C) 1996-1997 Id Software, Inc.

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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// sound.h -- client sound i/o functions

#ifndef __SOUND__
#define __SOUND__

#define DEFAULT_SOUND_PACKET_VOLUME 255
#define DEFAULT_SOUND_PACKET_ATTENUATION 1.0

typedef enum {false, true}     qboolean;  

// !!! if this is changed, it much be changed in asm_i386.h too !!!
typedef struct
{
	int left;
	int right;
} portable_samplepair_t;

#if 0
typedef struct sfx_s
{
	char 	name[MAX_QPATH];
	cache_user_t	cache;
} sfx_t;

// !!! if this is changed, it much be changed in asm_i386.h too !!!
typedef struct
{
	int 	length;
	int 	loopstart;
	int 	speed;
	int 	width;
	int 	stereo;
	byte	data[1];		// variable sized
} sfxcache_t;
#endif

typedef struct
{
	qboolean		gamealive;
	qboolean		soundalive;
	qboolean		splitbuffer;
	int				channels;
	int				samples;				// mono samples in buffer
	int				submission_chunk;		// don't mix less than this #
	int				samplepos;				// in mono samples
	int				samplebits;
	int				speed;
	unsigned char	*buffer;
} dma_t;

#if 0
// !!! if this is changed, it much be changed in asm_i386.h too !!!
typedef struct
{
	sfx_t	*sfx;			// sfx number
	int		leftvol;		// 0-255 volume
	int		rightvol;		// 0-255 volume
	int		end;			// end time in global paintsamples
	int 	pos;			// sample position in sfx
	int		looping;		// where to loop, -1 = no looping
	int		entnum;			// to allow overriding a specific sound
	int		entchannel;		//
	vec3_t	origin;			// origin of sound effect
	vec_t	dist_mult;		// distance multiplier (attenuation/clipK)
	int		master_vol;		// 0-255 master volume
} channel_t;

typedef struct
{
	int		rate;
	int		width;
	int		channels;
	int		loopstart;
	int		samples;
	int		dataofs;		// chunk starts this many bytes from file start
} wavinfo_t;

void S_Init (void);
void S_Startup (void);
void S_Shutdown (void);
void S_StartSound (int entnum, int entchannel, sfx_t *sfx, vec3_t origin, float fvol,  float attenuation);
void S_StaticSound (sfx_t *sfx, vec3_t origin, float vol, float attenuation);
void S_StopSound (int entnum, int entchannel);
void S_StopAllSounds(qboolean clear);
void S_ClearBuffer (void);
void S_Update (vec3_t origin, vec3_t v_forward, vec3_t v_right, vec3_t v_up);
void S_ExtraUpdate (void);

sfx_t *S_PrecacheSound (char *sample);
void S_TouchSound (char *sample);
void S_ClearPrecache (void);
void S_BeginPrecaching (void);
void S_EndPrecaching (void);
void S_PaintChannels(int endtime);
void S_InitPaintChannels (void);

// picks a channel based on priorities, empty slots, number of channels
channel_t *SND_PickChannel(int entnum, int entchannel);

// spatializes a channel
void SND_Spatialize(channel_t *ch);

// initializes cycling through a DMA buffer and returns information on it
qboolean SNDDMA_Init(void);

// gets the current DMA position
int SNDDMA_GetDMAPos(void);

// shutdown the DMA xfer.
void SNDDMA_Shutdown(void);

// ====================================================================
// User-setable variables
// ====================================================================

#define	MAX_CHANNELS			128
#define	MAX_DYNAMIC_CHANNELS	8


extern	channel_t   channels[MAX_CHANNELS];
// 0 to MAX_DYNAMIC_CHANNELS-1	= normal entity sounds
// MAX_DYNAMIC_CHANNELS to MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS -1 = water, etc
// MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS to total_channels = static sounds

extern	int			total_channels;

//
// Fake dma is a synchronous faking of the DMA progress used for
// isolating performance in the renderer.  The fakedma_updates is
// number of times S_Update() is called per second.
//

extern qboolean 		fakedma;
extern int 			fakedma_updates;
extern int		paintedtime;
extern vec3_t listener_origin;
extern vec3_t listener_forward;
extern vec3_t listener_right;
extern vec3_t listener_up;
extern volatile dma_t *shm;
extern volatile dma_t sn;
extern vec_t sound_nominal_clip_dist;

extern	cvar_t loadas8bit;
extern	cvar_t bgmvolume;
extern	cvar_t volume;

extern qboolean	snd_initialized;

extern int		snd_blocked;

void S_LocalSound (char *s);
sfxcache_t *S_LoadSound (sfx_t *s);

wavinfo_t GetWavinfo (char *name, byte *wav, int wavlength);

void SND_InitScaletable (void);
void SNDDMA_Submit(void);

void S_AmbientOff (void);
void S_AmbientOn (void);

#endif
#endif

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