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arts/artsc/artsdsp.c

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/* Evil evil evil hack to get OSS apps to cooperate with artsd
* This is based on the original esddsp, which esd uses to do the same.
*
* Copyright (C) 1998 Manish Singh <yosh@gimp.org>
* Copyright (C) 2000 Stefan Westerfeld <stefan@space.twc.de> (aRts port)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#define _GNU_SOURCE 1
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_SYS_SOUNDCARD_H
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/soundcard.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
/* #include <sys/mman.h> */
#include <fcntl.h>
#include <artsc.h>
#include <dlfcn.h>
#include "arts_export.h"
/*
* NOTE:
*
* To truly support non-blocking I/O, there is some stuff missing. Namely,
* select should be trapped and redirected, as well as the means for making
* a stream non-blocking and so on. Maybe poll, too.
*
* Currently, only apps that are doing blocking I/O will probably work right.
*/
/**
* the stream status: sndfd is -1 when unused, otherwise it is a useless fd
* which points to /dev/null, to ensure compatibility with more weird
* operations on streams
*
* settings contains what has already been set (speed, bits, channels), and
* is 7 when all of these are true
*
* stream contains an aRts stream or 0
*/
static int sndfd = -1;
static int settings;
static int arts_init_done = 0;
static arts_stream_t stream = 0;
static arts_stream_t record_stream = 0;
static int bits = 0;
static int speed = 0;
static int channels = 0;
static int frags;
#if defined(HAVE_IOCTL_INT_INT_DOTS)
typedef int ioctl_request_t;
#elif defined(HAVE_IOCTL_INT_ULONG_DOTS)
typedef unsigned long ioctl_request_t;
#elif defined(HAVE_IOCTL_INT_ULONGINT_DOTS)
typedef unsigned long int ioctl_request_t;
#else
#error "unknown ioctl type (check config.h, adapt configure test)..."
#endif
/*
* memory mapping emulation
*/
static int mmapemu = 0;
static count_info mmapemu_ocount;
static char *mmapemu_obuffer = 0;
static int mmapemu_osize = 0;
/*
* original C library functions
*/
typedef int (*orig_open_ptr)(const char *pathname, int flags, ...);
typedef int (*orig_close_ptr)(int fd);
typedef int (*orig_ioctl_ptr)(int fd, ioctl_request_t request, ...);
typedef ssize_t (*orig_write_ptr)(int fd, const void *buf, size_t count);
typedef ssize_t (*orig_read_ptr)(int fd, void *buf, size_t count);
typedef void* (*orig_mmap_ptr)(void *start, size_t length, int prot,
int flags, int fd, off_t offset);
typedef int (*orig_munmap_ptr)(void *start, size_t length);
typedef FILE* (*orig_fopen_ptr)(const char *path, const char *mode);
typedef int (*orig_access_ptr)(const char *pathname, int mode);
static orig_open_ptr orig_open;
static orig_close_ptr orig_close;
static orig_ioctl_ptr orig_ioctl;
static orig_write_ptr orig_write;
static orig_read_ptr orig_read;
static orig_mmap_ptr orig_mmap;
static orig_munmap_ptr orig_munmap;
static orig_fopen_ptr orig_fopen;
static orig_access_ptr orig_access;
static int artsdsp_debug = 0;
static int artsdsp_init = 0;
void *mmap(void *start, size_t length, int prot, int flags,
int fd, off_t offset);
int munmap(void *start, size_t length);
#define CHECK_INIT() if(!artsdsp_init) artsdsp_doinit();
/*
* Initialization - maybe this should be either be a startup only called
* routine, or use pthread locks to prevent strange effects in multithreaded
* use (however it seems highly unlikely that an application would create
* multiple threads before even using one of redirected the system functions
* once).
*/
static void artsdsp_doinit()
{
const char *env;
artsdsp_init = 1;
/* debugging? */
env = getenv("ARTSDSP_VERBOSE");
artsdsp_debug = env && !strcmp(env,"1");
/* mmap emulation? */
env = getenv("ARTSDSP_MMAP");
mmapemu = env && !strcmp(env,"1");
/* resolve original symbols */
orig_open = (orig_open_ptr)dlsym(RTLD_NEXT,"open");
orig_close = (orig_close_ptr)dlsym(RTLD_NEXT,"close");
orig_write = (orig_write_ptr)dlsym(RTLD_NEXT,"write");
orig_read = (orig_read_ptr)dlsym(RTLD_NEXT,"read");
orig_ioctl = (orig_ioctl_ptr)dlsym(RTLD_NEXT,"ioctl");
orig_mmap = (orig_mmap_ptr)dlsym(RTLD_NEXT,"mmap");
orig_munmap = (orig_munmap_ptr)dlsym(RTLD_NEXT,"munmap");
orig_fopen = (orig_fopen_ptr)dlsym(RTLD_NEXT,"fopen");
orig_access = (orig_access_ptr)dlsym(RTLD_NEXT,"access");
}
static void
#ifdef __GNUC__
__attribute__( ( format ( printf, 1, 2 ) ) )
#endif
artsdspdebug(const char *fmt,...)
{
CHECK_INIT();
if(artsdsp_debug)
{
va_list ap;
va_start(ap, fmt);
(void) vfprintf(stderr, fmt, ap);
va_end(ap);
}
}
static void mmapemu_flush()
{
int space;
if (mmapemu_osize == 0) {
return;
}
space = arts_stream_get(stream, ARTS_P_BUFFER_SPACE);
artsdspdebug("space = %d\n",space);
while(space >= 4096)
{
arts_write(stream,&mmapemu_obuffer[mmapemu_ocount.ptr],4096);
space -= 4096;
mmapemu_ocount.ptr += 4096;
mmapemu_ocount.ptr %= mmapemu_osize;
mmapemu_ocount.blocks++;
mmapemu_ocount.bytes += 4096;
}
}
/* returns 1 if the filename points to a sound device */
static int is_sound_device(const char *pathname)
{
if(!pathname) return 0;
if(strcmp(pathname,"/dev/dsp") == 0) return 1;
if(strcmp(pathname,"/dev/sound/dsp") == 0) return 1;
return 0;
}
int open (const char *pathname, int flags, ...)
{
va_list args;
mode_t mode = 0;
CHECK_INIT();
/*
* After the documentation, va_arg is not safe if there is no argument to
* get "random errors will occur", so only get it in case O_CREAT is set,
* and hope that passing 0 to the orig_open function in all other cases
* will work.
*/
va_start(args,flags);
if(flags & O_CREAT) {
/* The compiler will select one of these at compile-tyime if -O is used.
* Otherwise, it may be deferred until runtime.
*/
if (sizeof(int) >= sizeof(mode_t)) {
mode = va_arg(args, int);
} else {
mode = va_arg(args, mode_t);
}
}
va_end(args);
if (!is_sound_device(pathname)) /* original open for anything but sound */
return orig_open (pathname, flags, mode);
settings = 0;
frags = 0;
stream = 0;
record_stream = 0;
artsdspdebug ("aRts: hijacking /dev/dsp open...\n");
sndfd = orig_open("/dev/null",flags,mode);
if(sndfd >= 0)
{
if(!arts_init_done) {
int rc = arts_init();
if(rc < 0) {
artsdspdebug("error on aRts init: %s\n", arts_error_text(rc));
orig_close(sndfd);
sndfd = -1;
return orig_open (pathname, flags, mode);
}
else arts_init_done = 1;
}
}
/* success */
return sndfd;
}
int ioctl (int fd, ioctl_request_t request, ...)
{
int space, size, latency, odelay;
/*
* FreeBSD needs ioctl with varargs. However I have no idea how to "forward"
* the variable args ioctl to the orig_ioctl routine. So I expect the ioctl
* to have exactly one pointer-like parameter and forward that, hoping that
* it works
*/
va_list args;
void *argp;
va_start(args,request);
argp = va_arg(args, void *);
va_end(args);
CHECK_INIT();
if (fd != sndfd )
return orig_ioctl (fd, request, argp);
else if (sndfd != -1)
{
int *arg = (int *) argp;
artsdspdebug("aRts: hijacking /dev/dsp ioctl (%d : %x - %p)\n",
( int ) fd, ( int ) request, ( void* ) argp);
switch (request)
{
struct audio_buf_info *audiop;
#ifdef SNDCTL_DSP_RESET
case SNDCTL_DSP_RESET: /* _SIO ('P', 0) */
artsdspdebug("aRts: SNDCTL_DSP_RESET unsupported\n");
break;
#endif
#ifdef SNDCTL_DSP_SYNC
case SNDCTL_DSP_SYNC: /* _SIO ('P', 1) */
artsdspdebug("aRts: SNDCTL_DSP_SYNC unsupported\n");
break;
#endif
#ifdef SNDCTL_DSP_SPEED
case SNDCTL_DSP_SPEED: /* _SIOWR('P', 2, int) */
speed = *arg;
settings |= 2;
break;
#endif
#ifdef SNDCTL_DSP_STEREO
case SNDCTL_DSP_STEREO: /* _SIOWR('P', 3, int) */
channels = (*arg)?2:1;
settings |= 4;
break;
#endif
#ifdef SNDCTL_DSP_GETBLKSIZE
case SNDCTL_DSP_GETBLKSIZE: /* _SIOWR('P', 4, int) */
if(mmapemu)
*arg = 4096;
else if(stream)
*arg = arts_stream_get(stream,ARTS_P_PACKET_SIZE);
else
{
int fragSize = frags & 0x7fff;
if(fragSize > 1 && fragSize < 16)
*arg = (1 << fragSize);
else
*arg = 16384; /* no idea ;-) */
}
break;
#endif
#ifdef SNDCTL_DSP_SETFMT
case SNDCTL_DSP_SETFMT: /* _SIOWR('P',5, int) */
bits = (*arg & 0x30) ? 16 : 8;
settings |= 1;
break;
#endif
#ifdef SNDCTL_DSP_CHANNELS
case SNDCTL_DSP_CHANNELS: /* _SIOWR('P', 6, int) */
channels = (*arg);
settings |= 4;
break;
#endif
#ifdef SOUND_PCM_WRITE_FILTER
case SOUND_PCM_WRITE_FILTER: /* _SIOWR('P', 7, int) */
artsdspdebug("aRts: SNDCTL_DSP_WRITE_FILTER(%d) unsupported\n",*arg);
break;
#endif
#ifdef SNDCTL_DSP_POST
case SNDCTL_DSP_POST: /* _SIO ('P', 8) */
artsdspdebug("aRts: SNDCTL_DSP_POST unsupported\n");
break;
#endif
#ifdef SNDCTL_DSP_SUBDIVIDE
case SNDCTL_DSP_SUBDIVIDE: /* _SIOWR('P', 9, int) */
artsdspdebug("aRts: SNDCTL_DSP_SUBDIVIDE(%d) unsupported\n",*arg);
break;
#endif
#ifdef SNDCTL_DSP_SETFRAGMENT
case SNDCTL_DSP_SETFRAGMENT: /* _SIOWR('P',10, int) */
artsdspdebug("aRts: SNDCTL_DSP_SETFRAGMENT(%x) partially supported\n",
*arg);
frags = *arg;
break;
#endif
#ifdef SNDCTL_DSP_GETFMTS
case SNDCTL_DSP_GETFMTS: /* _SIOR ('P',11, int) */
*arg = 8 | 16;
break;
#endif
#if defined(SNDCTL_DSP_GETOSPACE) && defined(SNDCTL_DSP_GETISPACE)
case SNDCTL_DSP_GETOSPACE: /* _SIOR ('P',12, audio_buf_info) */
case SNDCTL_DSP_GETISPACE: /* _SIOR ('P',13, audio_buf_info) */
audiop = argp;
if(mmapemu)
{
audiop->fragstotal = 16;
audiop->fragsize = 4096;
audiop->bytes = 0; /* FIXME: is this right? */
audiop->fragments = 0;
}
else
{
audiop->fragstotal =
stream?arts_stream_get(stream, ARTS_P_PACKET_COUNT):10;
audiop->fragsize =
stream?arts_stream_get(stream, ARTS_P_PACKET_SIZE):16384;
audiop->bytes =
stream?arts_stream_get(stream, ARTS_P_BUFFER_SPACE):16384;
audiop->fragments = audiop->bytes / audiop->fragsize;
}
break;
#endif
#ifdef SNDCTL_DSP_NONBLOCK
case SNDCTL_DSP_NONBLOCK: /* _SIO ('P',14) */
artsdspdebug("aRts: SNDCTL_DSP_NONBLOCK unsupported\n");
break;
#endif
#ifdef SNDCTL_DSP_GETCAPS
case SNDCTL_DSP_GETCAPS: /* _SIOR ('P',15, int) */
if(mmapemu)
*arg = DSP_CAP_MMAP | DSP_CAP_TRIGGER | DSP_CAP_REALTIME | DSP_CAP_DUPLEX;
else
*arg = DSP_CAP_DUPLEX;
break;
#endif
#ifdef SNDCTL_DSP_GETTRIGGER
case SNDCTL_DSP_GETTRIGGER: /* _SIOR ('P',16, int) */
artsdspdebug("aRts: SNDCTL_DSP_GETTRIGGER unsupported\n");
break;
#endif
#ifdef SNDCTL_DSP_SETTRIGGER
case SNDCTL_DSP_SETTRIGGER: /* _SIOW ('P',16, int) */
artsdspdebug("aRts: SNDCTL_DSP_SETTRIGGER unsupported\n");
break;
#endif
#ifdef SNDCTL_DSP_GETIPTR
case SNDCTL_DSP_GETIPTR: /* _SIOR ('P',17, count_info) */
artsdspdebug("aRts: SNDCTL_DSP_GETIPTR unsupported\n");
break;
#endif
#ifdef SNDCTL_DSP_GETOPTR
case SNDCTL_DSP_GETOPTR: /* _SIOR ('P',18, count_info) */
if(mmapemu)
{
mmapemu_flush();
*((count_info *)arg) = mmapemu_ocount;
mmapemu_ocount.blocks = 0;
}
else
{
artsdspdebug("aRts: SNDCTL_DSP_GETOPTR unsupported\n");
}
break;
#endif
#ifdef SNDCTL_DSP_MAPINBUF
case SNDCTL_DSP_MAPINBUF: /* _SIOR ('P', 19, buffmem_desc) */
artsdspdebug("aRts: SNDCTL_DSP_MAPINBUF unsupported\n");
break;
#endif
#ifdef SNDCTL_DSP_MAPOUTBUF
case SNDCTL_DSP_MAPOUTBUF: /* _SIOR ('P', 20, buffmem_desc) */
artsdspdebug("aRts: SNDCTL_DSP_MAPOUTBUF unsupported\n");
break;
#endif
#ifdef SNDCTL_DSP_SETSYNCRO
case SNDCTL_DSP_SETSYNCRO: /* _SIO ('P', 21) */
artsdspdebug("aRts: SNDCTL_DSP_SETSYNCHRO unsupported\n");
break;
#endif
#ifdef SNDCTL_DSP_SETDUPLEX
case SNDCTL_DSP_SETDUPLEX: /* _SIO ('P', 22) */
artsdspdebug("aRts: SNDCTL_DSP_SETDUPLEX unsupported\n");
break;
#endif
#ifdef SNDCTL_DSP_GETODELAY
case SNDCTL_DSP_GETODELAY: /* _SIOR ('P', 23, int) */
space = arts_stream_get(stream, ARTS_P_BUFFER_SPACE);
size = arts_stream_get(stream, ARTS_P_BUFFER_SIZE);
latency = arts_stream_get(stream, ARTS_P_SERVER_LATENCY);
odelay = size - space + (latency * speed * bits * channels) / 8000;
artsdspdebug("aRts: SNDCTL_DSP_GETODELAY returning %d\n", odelay);
*arg = odelay;
break;
#endif
default:
artsdspdebug("aRts: unhandled /dev/dsp ioctl (%lx - %p)\n",request, argp);
break;
}
if (settings == 7 && !stream)
{
const char *name = getenv("ARTSDSP_NAME");
int fragSize = (frags & 0x7fff);
int fragCount = (frags & 0x7fff0000) >> 16;
artsdspdebug ("aRts: creating stream...\n");
stream = arts_play_stream(speed,bits,channels,name?name:"artsdsp");
if(fragSize > 1 && fragSize < 16)
{
/*
* if fragment settings are way too large (unrealistic), we
* will assume that the user didn't mean it, and let the C API
* choose a convenient number >= 3
*/
if(fragCount < 2 || fragCount > 8192
|| (fragCount * (1 << fragSize)) > 128*1024)
{
frags = 0x00030000+fragSize;
}
arts_stream_set(stream,ARTS_P_PACKET_SETTINGS,frags);
}
if(mmapemu)
{
arts_stream_set(stream,ARTS_P_PACKET_SETTINGS,0x0002000c);
mmapemu_ocount.ptr=mmapemu_ocount.blocks=mmapemu_ocount.bytes=0;
artsdspdebug("aRts: total latency = %dms, buffer latency = %dms\n",
arts_stream_get(stream,ARTS_P_TOTAL_LATENCY),
arts_stream_get(stream, ARTS_P_BUFFER_TIME));
}
}
return 0;
}
return 0;
}
int close(int fd)
{
CHECK_INIT();
if (fd != sndfd)
return orig_close (fd);
else if (sndfd != -1)
{
artsdspdebug ("aRts: /dev/dsp close...\n");
if(stream)
{
arts_close_stream(stream);
stream = 0;
}
if (record_stream)
{
arts_close_stream(record_stream);
record_stream = 0;
}
if(mmapemu && mmapemu_obuffer)
{
free(mmapemu_obuffer);
mmapemu_obuffer = 0;
}
/*
* there are problems with library unloading in conjunction with X11,
* (Arts::X11GlobalComm), so we don't unload stuff again here
*/
/* arts_free(); */
orig_close(sndfd);
sndfd = -1;
}
return 0;
}
int access(const char *pathname, int mode)
{
CHECK_INIT();
if (!is_sound_device(pathname)) /* original open for anything but sound */
return orig_access (pathname, mode);
else
artsdspdebug ("aRts: /dev/dsp access...\n");
return 0;
}
ssize_t write (int fd, const void *buf, size_t count)
{
CHECK_INIT();
if(fd != sndfd)
return orig_write(fd,buf,count);
else if(sndfd != -1)
{
artsdspdebug ("aRts: /dev/dsp write...\n");
if(stream != 0)
{
return arts_write(stream,buf,count);
}
}
return 0;
}
ssize_t read (int fd, void *buf, size_t count)
{
CHECK_INIT();
if (fd != sndfd)
return orig_read(fd,buf,count);
else if (sndfd == -1)
return 0;
if (!record_stream)
record_stream = arts_record_stream(speed, bits, channels, "artsdsp");
artsdspdebug ( "aRts: /dev/dsp read...\n" );
return arts_read(record_stream, buf, count);
}
void *mmap(void *start, size_t length, int prot, int flags,
int fd, off_t offset)
{
CHECK_INIT();
if(fd != sndfd || sndfd == -1)
return orig_mmap(start,length,prot,flags,fd,offset);
else
{
artsdspdebug ("aRts: mmap - start = %p, length = %zd, prot = %d\n",
start, length, prot);
artsdspdebug (" flags = %d, fd = %d, offset = %ld\n",flags, fd,offset);
if(mmapemu && length > 0)
{
mmapemu_osize = length;
mmapemu_obuffer = malloc(length);
mmapemu_ocount.ptr = mmapemu_ocount.blocks = mmapemu_ocount.bytes = 0;
return mmapemu_obuffer;
}
else artsdspdebug ("aRts: /dev/dsp mmap (unsupported, try -m option)...\n");
}
return (void *)-1;
}
int munmap(void *start, size_t length)
{
CHECK_INIT();
if(start != mmapemu_obuffer || mmapemu_obuffer == 0)
return orig_munmap(start,length);
artsdspdebug ("aRts: /dev/dsp munmap...\n");
mmapemu_obuffer = 0;
free(start);
return 0;
}
#ifdef HAVE_ARTSDSP_STDIO_EMU
/*
* use #include rather than linking, because we want to keep everything
* static inside artsdsp to be sure that we don't override application symbols
*/
#include "stdioemu.c"
FILE* fopen(const char *path, const char *mode)
{
CHECK_INIT();
if (!is_sound_device(path)) /* original open for anything but sound */
return orig_fopen (path, mode);
artsdspdebug ("aRts: hijacking /dev/dsp fopen...\n");
return fake_fopen(path, mode);
}
#endif
#endif
/*
* vim:ts=4
*/
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