add new padsp utility: a $LD_PRELOAD wrapper for using the OSS API with polypaudio

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@950 fefdeb5f-60dc-0310-8127-8f9354f1896f

3 files changed, 1335 insertions, 2 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 30e73512..6327d550 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -78,6 +78,7 @@ EXTRA_DIST = \
 		daemon/default.pa.in \
 		depmod.py \
 		daemon/esdcompat.sh.in \
+		utils/padsp.in \
 		modules/module-defs.h.m4
 
 polypconf_DATA = \
@@ -173,6 +174,24 @@ pabrowse_LDADD = $(AM_LDADD) libpolyp.la libpolyp-browse.la
 pabrowse_CFLAGS = $(AM_CFLAGS)
 pabrowse_LDFLAGS = $(AM_LDFLAGS) $(BINLDFLAGS)
 
+lib_LTLIBRARIES =
+CLEANFILES=
+
+if HAVE_OSS
+lib_LTLIBRARIES += libpolypdsp.la
+libpolypdsp_la_SOURCES = utils/padsp.c
+libpolypdsp_la_CFLAGS = $(AM_CFLAGS)
+libpolypdsp_la_LIBADD = $(AM_LIBADD) libpolyp.la
+libpolypdsp_la_LDFLAGS = -avoid-version
+
+CLEANFILES+=padsp
+bin_SCRIPTS += padsp
+
+padsp: utils/padsp.in Makefile
+	sed -e 's,@LIBPOLYPDSP\@,$(libdir)/libpolypdsp.so,g' < $< > $@
+
+endif
+
 ###################################
 #         Test programs           #
 ###################################
@@ -325,7 +344,7 @@ polypinclude_HEADERS += \
 endif
 endif
 
-lib_LTLIBRARIES = \
+lib_LTLIBRARIES += \
 		libpolyp.la \
 		libpolyp-simple.la
 
@@ -1141,7 +1160,7 @@ suid: polypaudio
 	chown root $<
 	chmod u+s $<
 
-CLEANFILES=esdcompat.sh client.conf default.pa daemon.conf
+CLEANFILES+=esdcompat.sh client.conf default.pa daemon.conf
 
 esdcompat.sh: daemon/esdcompat.sh.in Makefile
 	sed -e 's,@PACKAGE_VERSION\@,$(PACKAGE_VERSION),g' \
diff --git a/src/utils/padsp.c b/src/utils/padsp.c
new file mode 100644
index 00000000..06bdd575
--- /dev/null
+++ b/src/utils/padsp.c
@@ -0,0 +1,1284 @@
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+ 
+  polypaudio 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 Lesser General Public License
+  along with polypaudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifdef _FILE_OFFSET_BITS
+#undef _FILE_OFFSET_BITS
+#endif
+
+#ifndef _LARGEFILE64_SOURCE
+#define _LARGEFILE64_SOURCE 1
+#endif
+
+#include <sys/soundcard.h>
+#include <sys/ioctl.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <dlfcn.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <signal.h>
+
+#include <linux/sockios.h>
+
+#include <polyp/polypaudio.h>
+#include <polypcore/llist.h>
+#include <polypcore/gccmacro.h>
+
+typedef enum {
+    FD_INFO_MIXER,
+    FD_INFO_PLAYBACK
+} fd_info_type_t;
+
+typedef struct fd_info fd_info;
+
+struct fd_info {
+    pthread_mutex_t mutex;
+    int ref;
+    
+    fd_info_type_t type;
+    int app_fd, thread_fd;
+
+    pa_sample_spec sample_spec;
+    size_t fragment_size;
+    unsigned n_fragments;
+
+    pa_threaded_mainloop *mainloop;
+    pa_context *context;
+    pa_stream *stream;
+
+    pa_io_event *io_event;
+
+    void *buf;
+
+    int operation_success;
+
+    PA_LLIST_FIELDS(fd_info);
+};
+
+static int dsp_drain(fd_info *i);
+
+static pthread_mutex_t fd_infos_mutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_mutex_t func_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+static PA_LLIST_HEAD(fd_info, fd_infos) = NULL;
+
+static int (*_ioctl)(int, int, void*) = NULL;
+static int (*_close)(int) = NULL;
+static int (*_open)(const char *, int, mode_t) = NULL;
+static FILE* (*_fopen)(const char *path, const char *mode) = NULL;
+static int (*_open64)(const char *, int, mode_t) = NULL;
+static FILE* (*_fopen64)(const char *path, const char *mode) = NULL;
+static int (*_fclose)(FILE *f) = NULL;
+
+#define LOAD_IOCTL_FUNC() \
+do { \
+    pthread_mutex_lock(&func_mutex); \
+    if (!_ioctl)  \
+        _ioctl = (int (*)(int, int, void*)) dlsym(RTLD_NEXT, "ioctl"); \
+    pthread_mutex_unlock(&func_mutex); \
+} while(0)
+
+#define LOAD_OPEN_FUNC() \
+do { \
+    pthread_mutex_lock(&func_mutex); \
+    if (!_open) \
+        _open = (int (*)(const char *, int, mode_t)) dlsym(RTLD_NEXT, "open"); \
+    pthread_mutex_unlock(&func_mutex); \
+} while(0)
+
+#define LOAD_OPEN64_FUNC() \
+do { \
+    pthread_mutex_lock(&func_mutex); \
+    if (!_open64) \
+        _open64 = (int (*)(const char *, int, mode_t)) dlsym(RTLD_NEXT, "open64"); \
+    pthread_mutex_unlock(&func_mutex); \
+} while(0)
+
+#define LOAD_CLOSE_FUNC() \
+do { \
+    pthread_mutex_lock(&func_mutex); \
+    if (!_close) \
+        _close = (int (*)(int)) dlsym(RTLD_NEXT, "close"); \
+    pthread_mutex_unlock(&func_mutex); \
+} while(0)
+
+#define LOAD_FOPEN_FUNC() \
+do { \
+    pthread_mutex_lock(&func_mutex); \
+    if (!_fopen) \
+        _fopen = (FILE* (*)(const char *, const char*)) dlsym(RTLD_NEXT, "fopen"); \
+    pthread_mutex_unlock(&func_mutex); \
+} while(0)
+
+#define LOAD_FOPEN64_FUNC() \
+do { \
+    pthread_mutex_lock(&func_mutex); \
+    if (!_fopen64) \
+        _fopen64 = (FILE* (*)(const char *, const char*)) dlsym(RTLD_NEXT, "fopen64"); \
+    pthread_mutex_unlock(&func_mutex); \
+} while(0)
+
+#define LOAD_FCLOSE_FUNC() \
+do { \
+    pthread_mutex_lock(&func_mutex); \
+    if (!_fclose) \
+        _fclose = (int (*)(FILE *)) dlsym(RTLD_NEXT, "fclose"); \
+    pthread_mutex_unlock(&func_mutex); \
+} while(0)
+
+static void debug(const char *format, ...) PA_GCC_PRINTF_ATTR(1,2);
+
+static void debug(const char *format, ...) {
+    va_list ap;
+    if (getenv("PADSP_DEBUG")) {
+        va_start(ap, format);
+        vfprintf(stderr, format, ap);
+        va_end(ap);
+    }
+}
+
+static pthread_key_t recursion_key;
+
+static void recursion_key_alloc(void) {
+    pthread_key_create(&recursion_key, NULL);
+}
+
+static int function_enter(void) {
+    /* Avoid recursive calls */
+    static pthread_once_t recursion_key_once = PTHREAD_ONCE_INIT;
+    pthread_once(&recursion_key_once, recursion_key_alloc);
+    
+    if (pthread_getspecific(recursion_key))
+        return 0;
+
+    pthread_setspecific(recursion_key, (void*) 1);
+    return 1;
+}
+
+static void function_exit(void) {
+    pthread_setspecific(recursion_key, NULL);
+}
+
+static void fd_info_free(fd_info *i) {
+    assert(i);
+
+    debug(__FILE__": freeing fd info (fd=%i)\n", i->app_fd);
+
+    dsp_drain(i);
+    
+    if (i->mainloop)
+        pa_threaded_mainloop_stop(i->mainloop);
+    
+    if (i->stream) {
+        pa_stream_disconnect(i->stream);
+        pa_stream_unref(i->stream);
+    }
+
+    if (i->context) {
+        pa_context_disconnect(i->context);
+        pa_context_unref(i->context);
+    }
+    
+    if (i->mainloop)
+        pa_threaded_mainloop_free(i->mainloop);
+
+    if (i->app_fd >= 0) {
+        LOAD_CLOSE_FUNC();
+        _close(i->app_fd);
+    }
+
+    if (i->thread_fd >= 0) {
+        LOAD_CLOSE_FUNC();
+        _close(i->thread_fd);
+    }
+
+    free(i->buf);
+
+    pthread_mutex_destroy(&i->mutex);
+    free(i);
+}
+
+static fd_info *fd_info_ref(fd_info *i) {
+    assert(i);
+    
+    pthread_mutex_lock(&i->mutex);
+    assert(i->ref >= 1);
+    i->ref++;
+
+/*     debug(__FILE__": ref++, now %i\n", i->ref); */
+    pthread_mutex_unlock(&i->mutex);
+
+    return i;
+}
+
+static void fd_info_unref(fd_info *i) {
+    int r;
+    pthread_mutex_lock(&i->mutex);
+    assert(i->ref >= 1);
+    r = --i->ref;
+/*     debug(__FILE__": ref--, now %i\n", i->ref); */
+    pthread_mutex_unlock(&i->mutex);
+
+    if (r <= 0)
+        fd_info_free(i);
+}
+
+static void context_state_cb(pa_context *c, void *userdata) {
+    fd_info *i = userdata;
+    assert(c);
+
+    switch (pa_context_get_state(c)) {
+        case PA_CONTEXT_READY:
+        case PA_CONTEXT_TERMINATED:
+        case PA_CONTEXT_FAILED:
+            pa_threaded_mainloop_signal(i->mainloop, 0);
+            break;
+
+        case PA_CONTEXT_UNCONNECTED:
+        case PA_CONTEXT_CONNECTING:
+        case PA_CONTEXT_AUTHORIZING:
+        case PA_CONTEXT_SETTING_NAME:
+            break;
+    }
+}
+
+static void reset_params(fd_info *i) {
+    assert(i);
+    
+    i->sample_spec.format = PA_SAMPLE_ULAW;
+    i->sample_spec.channels = 1;
+    i->sample_spec.rate = 8000;
+    i->fragment_size = 1024;
+    i->n_fragments = 0;
+}
+
+static fd_info* fd_info_new(fd_info_type_t type, int *_errno) {
+    fd_info *i;
+    int sfds[2] = { -1, -1 };
+
+    debug(__FILE__": fd_info_new()\n");
+
+    signal(SIGPIPE, SIG_IGN); /* Yes, ugly as hell */
+    
+    if (!(i = malloc(sizeof(fd_info)))) {
+        *_errno = ENOMEM;
+        goto fail;
+    }
+
+    i->app_fd = i->thread_fd = -1;
+    i->type = type;
+
+    i->mainloop = NULL;
+    i->context = NULL;
+    i->stream = NULL;
+    i->io_event = NULL;
+    pthread_mutex_init(&i->mutex, NULL);
+    i->ref = 1;
+    i->buf = NULL;
+    PA_LLIST_INIT(fd_info, i);
+
+    reset_params(i);
+
+    if (socketpair(AF_UNIX, SOCK_STREAM, 0, sfds) < 0) {
+        *_errno = errno;
+        debug(__FILE__": socket() failed: %s\n", strerror(errno));
+        goto fail;
+    }
+
+    i->app_fd = sfds[0];
+    i->thread_fd = sfds[1];
+
+    if (!(i->mainloop = pa_threaded_mainloop_new())) {
+        *_errno = EIO;
+        debug(__FILE__": pa_threaded_mainloop_new() failed\n");
+        goto fail;
+    }
+
+    if (!(i->context = pa_context_new(pa_threaded_mainloop_get_api(i->mainloop), "oss"))) {
+        *_errno = EIO;
+        debug(__FILE__": pa_context_new() failed\n");
+        goto fail;
+    }
+
+    pa_context_set_state_callback(i->context, context_state_cb, i);
+
+    if (pa_context_connect(i->context, NULL, 0, NULL) < 0) {
+        *_errno = ECONNREFUSED;
+        debug(__FILE__": pa_context_connect() failed: %s\n", pa_strerror(pa_context_errno(i->context)));
+        goto fail;
+    }
+
+    pa_threaded_mainloop_lock(i->mainloop);
+
+    if (pa_threaded_mainloop_start(i->mainloop) < 0) {
+        *_errno = EIO;
+        debug(__FILE__": pa_threaded_mainloop_start() failed\n");
+        goto unlock_and_fail;
+    }
+
+    /* Wait until the context is ready */
+    pa_threaded_mainloop_wait(i->mainloop);
+
+    if (pa_context_get_state(i->context) != PA_CONTEXT_READY) {
+        *_errno = ECONNREFUSED;
+        debug(__FILE__": pa_context_connect() failed: %s\n", pa_strerror(pa_context_errno(i->context)));
+        goto unlock_and_fail;
+    }
+
+    pa_threaded_mainloop_unlock(i->mainloop);
+    return i;
+
+unlock_and_fail:
+
+    pa_threaded_mainloop_unlock(i->mainloop);
+    
+fail:
+
+    if (i)
+        fd_info_unref(i);
+    
+    return NULL;
+}
+
+static void fd_info_add_to_list(fd_info *i) {
+    assert(i);
+
+    pthread_mutex_lock(&fd_infos_mutex);
+    PA_LLIST_PREPEND(fd_info, fd_infos, i);
+    pthread_mutex_unlock(&fd_infos_mutex);
+
+    fd_info_ref(i);
+}
+
+static void fd_info_remove_from_list(fd_info *i) {
+    assert(i);
+
+    pthread_mutex_lock(&fd_infos_mutex);
+    PA_LLIST_REMOVE(fd_info, fd_infos, i);
+    pthread_mutex_unlock(&fd_infos_mutex);
+
+    fd_info_unref(i);
+}
+
+static fd_info* fd_info_find(int fd) {
+    fd_info *i;
+
+    pthread_mutex_lock(&fd_infos_mutex);
+    
+    for (i = fd_infos; i; i = i->next)
+        if (i->app_fd == fd) {
+            fd_info_ref(i);
+            break;
+        }
+
+    pthread_mutex_unlock(&fd_infos_mutex);
+    
+    return i;
+}
+
+static void fix_metrics(fd_info *i) {
+    size_t fs;
+    char t[PA_SAMPLE_SPEC_SNPRINT_MAX];
+
+    fs = pa_frame_size(&i->sample_spec);
+    i->fragment_size = (i->fragment_size/fs)*fs;
+    
+    if (i->n_fragments < 2)
+        i->n_fragments = 12;
+
+    if (i->fragment_size <= 0)
+        if ((i->fragment_size = pa_bytes_per_second(&i->sample_spec) / 2 / i->n_fragments) <= 0)
+            i->fragment_size = 1024;
+
+    debug(__FILE__": sample spec: %s\n", pa_sample_spec_snprint(t, sizeof(t), &i->sample_spec));
+    debug(__FILE__": fixated metrics to %i fragments, %i bytes each.\n", i->n_fragments, i->fragment_size);
+}
+
+static void stream_request_cb(pa_stream *s, size_t length, void *userdata) {
+    fd_info *i = userdata;
+    assert(s);
+
+    if (i->io_event) {
+        pa_mainloop_api *api;
+        api = pa_threaded_mainloop_get_api(i->mainloop);
+        api->io_enable(i->io_event, PA_IO_EVENT_INPUT);
+    }
+}
+
+static void stream_latency_update_cb(pa_stream *s, void *userdata) {
+    fd_info *i = userdata;
+    assert(s);
+
+    pa_threaded_mainloop_signal(i->mainloop, 0);
+}
+
+static void fd_info_shutdown(fd_info *i) {
+    assert(i);
+
+    if (i->io_event) {
+        pa_mainloop_api *api;
+        api = pa_threaded_mainloop_get_api(i->mainloop);
+        api->io_free(i->io_event);
+        i->io_event = NULL;
+    }
+
+    if (i->thread_fd >= 0) {
+        close(i->thread_fd);
+        i->thread_fd = -1;
+    }
+}
+
+static int fd_info_copy_data(fd_info *i, int force) {
+    size_t n;
+
+    if (!i->stream)
+        return -1;
+
+    if ((n = pa_stream_writable_size(i->stream)) == (size_t) -1) {
+        debug(__FILE__": pa_stream_writable_size(): %s\n", pa_strerror(pa_context_errno(i->context)));
+        return -1;
+    }
+    
+    while (n >= i->fragment_size || force) {
+        ssize_t r;
+        
+        if (!i->buf) {
+            if (!(i->buf = malloc(i->fragment_size))) {
+                debug(__FILE__": malloc() failed.\n");
+                return -1;
+            }
+        }
+    
+        if ((r = read(i->thread_fd, i->buf, i->fragment_size)) <= 0) {
+
+            if (errno == EAGAIN)
+                break;
+            
+            debug(__FILE__": read(): %s\n", r == 0 ? "EOF" : strerror(errno));
+            return -1;
+        }
+    
+        if (pa_stream_write(i->stream, i->buf, r, free, 0, PA_SEEK_RELATIVE) < 0) {
+            debug(__FILE__": pa_stream_write(): %s\n", pa_strerror(pa_context_errno(i->context)));
+            return -1;
+        }
+
+        i->buf = NULL;
+
+        assert(n >= (size_t) r);
+        n -= r;
+    }
+
+    if (i->io_event) {
+        pa_mainloop_api *api;
+        api = pa_threaded_mainloop_get_api(i->mainloop);
+        api->io_enable(i->io_event, n >= i->fragment_size ? PA_IO_EVENT_INPUT : 0);
+    }
+
+    return 0;
+}
+
+static void stream_state_cb(pa_stream *s, void * userdata) {
+    fd_info *i = userdata;
+    assert(s);
+
+    switch (pa_stream_get_state(s)) {
+
+        case PA_STREAM_READY:
+            debug(__FILE__": stream established.\n");
+            break;
+            
+        case PA_STREAM_FAILED:
+            debug(__FILE__": pa_stream_connect_playback() failed: %s\n", pa_strerror(pa_context_errno(i->context)));
+            fd_info_shutdown(i);
+            break;
+
+        case PA_STREAM_TERMINATED:
+        case PA_STREAM_UNCONNECTED:
+        case PA_STREAM_CREATING:
+            break;
+    }
+}
+
+static int create_stream(fd_info *i) {
+    pa_buffer_attr attr;
+    int n;
+    
+    assert(i);
+
+    fix_metrics(i);
+
+    if (!(i->stream = pa_stream_new(i->context, "audio stream", &i->sample_spec, NULL))) {
+        debug(__FILE__": pa_stream_new() failed: %s\n", pa_strerror(pa_context_errno(i->context)));
+        goto fail;
+    }
+
+    pa_stream_set_state_callback(i->stream, stream_state_cb, i);
+    pa_stream_set_write_callback(i->stream, stream_request_cb, i);
+    pa_stream_set_latency_update_callback(i->stream, stream_latency_update_cb, i);
+
+    memset(&attr, 0, sizeof(attr));
+    attr.maxlength = i->fragment_size * (i->n_fragments+1);
+    attr.tlength = i->fragment_size * i->n_fragments;
+    attr.prebuf = i->fragment_size;
+    attr.minreq = i->fragment_size;
+    
+    if (pa_stream_connect_playback(i->stream, NULL, &attr, PA_STREAM_INTERPOLATE_TIMING|PA_STREAM_AUTO_TIMING_UPDATE, NULL, NULL) < 0) {
+        debug(__FILE__": pa_stream_connect_playback() failed: %s\n", pa_strerror(pa_context_errno(i->context)));
+        goto fail;
+    }
+
+    n = i->fragment_size;
+    setsockopt(i->app_fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n));
+    n = i->fragment_size;
+    setsockopt(i->thread_fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n));
+    
+    return 0;
+
+fail:
+    return -1;
+}
+
+static void free_stream(fd_info *i) {
+    assert(i);
+
+    if (i->stream) {
+        pa_stream_disconnect(i->stream);
+        pa_stream_unref(i->stream);
+        i->stream = NULL;
+    }
+}
+
+static void io_event_cb(pa_mainloop_api *api, pa_io_event *e, int fd, pa_io_event_flags_t flags, void *userdata) {
+    fd_info *i = userdata;
+
+    pa_threaded_mainloop_signal(i->mainloop, 0);
+    
+    if (flags & PA_IO_EVENT_INPUT) {
+
+        if (!i->stream) {
+            api->io_enable(e, 0);
+
+            if (create_stream(i) < 0)
+                goto fail;
+
+        } else {
+            if (fd_info_copy_data(i, 0) < 0)
+                goto fail;
+        }
+        
+    } else if (flags & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR))
+        goto fail;
+
+    return;
+    
+fail:
+    /* We can't do anything better than removing the event source */
+    fd_info_shutdown(i);
+}
+
+static int dsp_open(int flags, int *_errno) {
+    fd_info *i;
+    pa_mainloop_api *api;
+    int ret;
+    int f;
+
+    if ((flags != O_WRONLY) && (flags != (O_WRONLY|O_NONBLOCK))) {
+        *_errno = EACCES;
+        return -1;
+    }
+    
+    if (!(i = fd_info_new(FD_INFO_PLAYBACK, _errno)))
+        return -1;
+
+    shutdown(i->thread_fd, SHUT_WR);
+    shutdown(i->app_fd, SHUT_RD);
+
+    if ((flags & O_NONBLOCK) == O_NONBLOCK) {
+        if ((f = fcntl(i->app_fd, F_GETFL)) >= 0)
+            fcntl(i->app_fd, F_SETFL, f|O_NONBLOCK);
+    }
+    if ((f = fcntl(i->thread_fd, F_GETFL)) >= 0)
+        fcntl(i->thread_fd, F_SETFL, f|O_NONBLOCK);
+
+    fcntl(i->app_fd, F_SETFD, FD_CLOEXEC);
+    fcntl(i->thread_fd, F_SETFD, FD_CLOEXEC);
+
+    pa_threaded_mainloop_lock(i->mainloop);
+    api = pa_threaded_mainloop_get_api(i->mainloop);
+    if (!(i->io_event = api->io_new(api, i->thread_fd, PA_IO_EVENT_INPUT, io_event_cb, i)))
+        goto fail;
+    
+    pa_threaded_mainloop_unlock(i->mainloop);
+
+    debug(__FILE__": dsp_open() succeeded, fd=%i\n", i->app_fd);
+
+    fd_info_add_to_list(i);
+    ret = i->app_fd;
+    fd_info_unref(i);
+    
+    return ret;
+
+fail:
+    pa_threaded_mainloop_unlock(i->mainloop);
+
+    if (i)
+        fd_info_unref(i);
+    
+    *_errno = EIO;
+
+    debug(__FILE__": dsp_open() failed\n");
+
+    return -1;
+}
+
+static int mixer_open(int flags, int *_errno) {
+/*     fd_info *i; */
+
+    *_errno = ENOSYS;
+    return -1;
+
+/*     if (!(i = fd_info_new(FD_INFO_MIXER))) */
+/*         return -1; */
+
+}
+
+int open(const char *filename, int flags, ...) {
+    va_list args;
+    mode_t mode = 0;
+    int r, _errno = 0;
+
+    va_start(args, flags);
+    if (flags & O_CREAT)
+        mode = va_arg(args, mode_t);
+    va_end(args);
+
+    if (!function_enter()) {
+        LOAD_OPEN_FUNC();
+        return _open(filename, flags, mode);
+    }
+
+    debug(__FILE__": open()\n");
+    
+    if (strcmp(filename, "/dev/dsp") == 0 || strcmp(filename, "/dev/adsp") == 0) {
+        r = dsp_open(flags, &_errno);
+    } else if (strcmp(filename, "/dev/mixer") == 0) {
+        r = mixer_open(flags, &_errno);
+    } else {
+        function_exit();
+        LOAD_OPEN_FUNC();
+        return _open(filename, flags, mode);
+    }
+
+    function_exit();
+    
+    if (_errno)
+        errno = _errno;
+    
+    return r;
+}
+
+static int mixer_ioctl(fd_info *i, unsigned long request, void*argp, int *_errno) {
+    *_errno = ENOSYS;
+    return -1;
+}
+
+static int map_format(int *fmt, pa_sample_spec *ss) {
+    
+    switch (*fmt) {
+        case AFMT_MU_LAW:
+            ss->format = PA_SAMPLE_ULAW;
+            break;
+            
+        case AFMT_A_LAW:
+            ss->format = PA_SAMPLE_ALAW;
+            break;
+            
+        case AFMT_S8:
+            *fmt = AFMT_U8;
+            /* fall through */
+        case AFMT_U8:
+            ss->format = PA_SAMPLE_U8;
+            break;
+            
+        case AFMT_U16_BE:
+            *fmt = AFMT_S16_BE;
+            /* fall through */
+        case AFMT_S16_BE:
+            ss->format = PA_SAMPLE_S16BE;
+            break;
+            
+        case AFMT_U16_LE:
+            *fmt = AFMT_S16_LE;
+            /* fall through */
+        case AFMT_S16_LE:
+            ss->format = PA_SAMPLE_S16LE;
+            break;
+            
+        default:
+            ss->format = PA_SAMPLE_S16NE;
+            *fmt = AFMT_S16_NE;
+            break;
+    }
+
+    return 0;
+}
+
+static int map_format_back(pa_sample_format_t format) {
+    switch (format) {
+        case PA_SAMPLE_S16LE: return AFMT_S16_LE;
+        case PA_SAMPLE_S16BE: return AFMT_S16_BE;
+        case PA_SAMPLE_ULAW: return AFMT_MU_LAW;
+        case PA_SAMPLE_ALAW: return AFMT_A_LAW;
+        case PA_SAMPLE_U8: return AFMT_U8;
+        default:
+            abort();
+    }
+}
+
+static void success_cb(pa_stream *s, int success, void *userdata) {
+    fd_info *i = userdata;
+
+    assert(s);
+    assert(i);
+
+    i->operation_success = success;
+    pa_threaded_mainloop_signal(i->mainloop, 0);
+}
+
+static int dsp_empty_socket(fd_info *i) {
+    int ret = -1;
+    
+    /* Empty the socket */
+    for (;;) {
+        int l;
+        
+        if (i->thread_fd < 0)
+            break;
+        
+        if (ioctl(i->thread_fd, SIOCINQ, &l) < 0) {
+            debug(__FILE__": SIOCINQ: %s\n", strerror(errno));
+            break;
+        }
+
+        if (!l)
+            break;
+        
+        pa_threaded_mainloop_wait(i->mainloop);
+    }
+
+    return ret;
+}
+
+static int dsp_drain(fd_info *i) {
+    pa_operation *o = NULL;
+    int r = -1;
+
+    if (!i->mainloop)
+        return 0;
+    
+    debug(__FILE__": Draining.\n");
+
+    pa_threaded_mainloop_lock(i->mainloop);
+
+    if (dsp_empty_socket(i) < 0)
+        goto fail;
+    
+    if (!i->stream)
+        goto fail;
+
+    debug(__FILE__": Really draining.\n");
+        
+    if (!(o = pa_stream_drain(i->stream, success_cb, i))) {
+        debug(__FILE__": pa_stream_drain(): %s\n", pa_strerror(pa_context_errno(i->context)));
+        goto fail;
+    }
+
+    i->operation_success = 0;
+    while (pa_operation_get_state(o) != PA_OPERATION_DONE) {
+        if (!i->stream || pa_stream_get_state(i->stream) != PA_STREAM_READY)
+            goto fail;
+            
+        pa_threaded_mainloop_wait(i->mainloop);
+    }
+
+    if (!i->operation_success) {
+        debug(__FILE__": pa_stream_drain() 2: %s\n", pa_strerror(pa_context_errno(i->context)));
+        goto fail;
+    }
+
+    r = 0;
+    
+fail:
+    
+    if (o)
+        pa_operation_unref(o);
+
+    pa_threaded_mainloop_unlock(i->mainloop);
+
+    return 0;
+}
+
+static int dsp_trigger(fd_info *i) {
+    pa_operation *o = NULL;
+    int r = -1;
+
+    fd_info_copy_data(i, 1);
+
+    if (!i->stream)
+        return 0;
+
+    pa_threaded_mainloop_lock(i->mainloop);
+
+    if (dsp_empty_socket(i) < 0)
+        goto fail;
+
+    debug(__FILE__": Triggering.\n");
+        
+    if (!(o = pa_stream_trigger(i->stream, success_cb, i))) {
+        debug(__FILE__": pa_stream_trigger(): %s\n", pa_strerror(pa_context_errno(i->context)));
+        goto fail;
+    }
+
+    i->operation_success = 0;
+    while (!pa_operation_get_state(o) != PA_OPERATION_DONE) {
+        if (!i->stream || pa_stream_get_state(i->stream) != PA_STREAM_READY)
+            goto fail;
+            
+        pa_threaded_mainloop_wait(i->mainloop);
+    }
+
+    if (!i->operation_success) {
+        debug(__FILE__": pa_stream_trigger(): %s\n", pa_strerror(pa_context_errno(i->context)));
+        goto fail;
+    }
+
+    r = 0;
+    
+fail:
+    
+    if (o)
+        pa_operation_unref(o);
+
+    pa_threaded_mainloop_unlock(i->mainloop);
+
+    return 0;
+}
+
+static int dsp_ioctl(fd_info *i, unsigned long request, void*argp, int *_errno) {
+    int ret = -1;
+    
+    switch (request) {
+        case SNDCTL_DSP_SETFMT: {
+            debug(__FILE__": SNDCTL_DSP_SETFMT: %i\n", *(int*) argp);
+            
+            pa_threaded_mainloop_lock(i->mainloop);
+
+            if (*(int*) argp == AFMT_QUERY)
+                *(int*) argp = map_format_back(i->sample_spec.format);
+            else {
+                map_format((int*) argp, &i->sample_spec);
+                free_stream(i);
+            }
+
+            pa_threaded_mainloop_unlock(i->mainloop);
+            break;
+        }
+            
+        case SNDCTL_DSP_SPEED: {
+            pa_sample_spec ss;
+            int valid;
+            
+            debug(__FILE__": SNDCTL_DSP_SPEED: %i\n", *(int*) argp);
+
+            pa_threaded_mainloop_lock(i->mainloop);
+
+            ss = i->sample_spec;
+            ss.rate = *(int*) argp;
+
+            if ((valid = pa_sample_spec_valid(&ss))) {
+                i->sample_spec = ss;
+                free_stream(i);
+            }
+            
+            pa_threaded_mainloop_unlock(i->mainloop);
+
+            if (!valid) {
+                *_errno = EINVAL;
+                goto fail;
+            }
+            
+            break;
+        }
+            
+        case SNDCTL_DSP_STEREO:
+            debug(__FILE__": SNDCTL_DSP_STEREO: %i\n", *(int*) argp);
+            
+            pa_threaded_mainloop_lock(i->mainloop);
+            
+            i->sample_spec.channels = *(int*) argp ? 2 : 1;
+            free_stream(i);
+            
+            pa_threaded_mainloop_unlock(i->mainloop);
+            return 0;
+
+        case SNDCTL_DSP_CHANNELS: {
+            pa_sample_spec ss;
+            int valid;
+            
+            debug(__FILE__": SNDCTL_DSP_CHANNELS: %i\n", *(int*) argp);
+            
+            pa_threaded_mainloop_lock(i->mainloop);
+
+            ss = i->sample_spec;
+            ss.channels = *(int*) argp;
+
+            if ((valid = pa_sample_spec_valid(&ss))) {
+                i->sample_spec = ss;
+                free_stream(i);
+            }
+            
+            pa_threaded_mainloop_unlock(i->mainloop);
+
+            if (!valid) {
+                *_errno = EINVAL;
+                goto fail;
+            }
+
+            break;
+        }
+
+        case SNDCTL_DSP_GETBLKSIZE:
+            debug(__FILE__": SNDCTL_DSP_GETBLKSIZE\n");
+
+            pa_threaded_mainloop_lock(i->mainloop);
+
+            fix_metrics(i);
+            *(int*) argp = i->fragment_size;
+            
+            pa_threaded_mainloop_unlock(i->mainloop);
+            
+            break;
+
+        case SNDCTL_DSP_SETFRAGMENT:
+            debug(__FILE__": SNDCTL_DSP_SETFRAGMENT: 0x%8x\n", *(int*) argp);
+            
+            pa_threaded_mainloop_lock(i->mainloop);
+            
+            i->fragment_size = 1 << (*(int*) argp);
+            i->n_fragments = (*(int*) argp) >> 16;
+            
+            free_stream(i);
+            
+            pa_threaded_mainloop_unlock(i->mainloop);
+            
+            break;
+            
+        case SNDCTL_DSP_GETCAPS:
+            debug(__FILE__": SNDCTL_DSP_CAPS\n");
+            
+            *(int*)  argp = DSP_CAP_MULTI;
+            break;
+
+        case SNDCTL_DSP_GETODELAY: {
+            int l;
+            
+            debug(__FILE__": SNDCTL_DSP_GETODELAY\n");
+            
+            pa_threaded_mainloop_lock(i->mainloop);
+
+            *(int*) argp = 0;
+            
+            for (;;) {
+                pa_usec_t usec;
+                if (!i->stream || pa_stream_get_state(i->stream) != PA_STREAM_READY)
+                    break;
+
+                if (pa_stream_get_latency(i->stream, &usec, NULL) >= 0) {
+                    *(int*) argp = pa_usec_to_bytes(usec, &i->sample_spec);
+                    break;
+                }
+
+                if (pa_context_errno(i->context) != PA_ERR_NODATA) {
+                    debug(__FILE__": pa_stream_get_latency(): %s\n", pa_strerror(pa_context_errno(i->context)));
+                    break;
+                }
+
+                pa_threaded_mainloop_wait(i->mainloop);
+            }
+            
+            if (ioctl(i->thread_fd, SIOCINQ, &l) < 0)
+                debug(__FILE__": SIOCINQ failed: %s\n", strerror(errno));
+            else
+                *(int*) argp += l;
+
+            pa_threaded_mainloop_unlock(i->mainloop);
+
+            debug(__FILE__": ODELAY: %i\n", *(int*) argp);
+
+            break;
+        }
+            
+        case SNDCTL_DSP_RESET: {
+            debug(__FILE__": SNDCTL_DSP_RESET\n");
+            
+            pa_threaded_mainloop_lock(i->mainloop);
+
+            free_stream(i);
+            reset_params(i);
+            
+            pa_threaded_mainloop_unlock(i->mainloop);
+            break;
+        }
+            
+        case SNDCTL_DSP_GETFMTS: {
+            debug(__FILE__": SNDCTL_DSP_GETFMTS\n");
+            
+            *(int*) argp = AFMT_MU_LAW|AFMT_A_LAW|AFMT_U8|AFMT_S16_LE|AFMT_S16_BE;
+            break;
+        }
+
+        case SNDCTL_DSP_POST:
+            debug(__FILE__": SNDCTL_DSP_POST\n");
+            
+            if (dsp_trigger(i) < 0) 
+                *_errno = EIO;
+            break;
+
+        case SNDCTL_DSP_SYNC: 
+            debug(__FILE__": SNDCTL_DSP_SYNC\n");
+            
+            if (dsp_drain(i) < 0) 
+                *_errno = EIO;
+
+            break;
+
+        case SNDCTL_DSP_GETOSPACE: {
+            audio_buf_info *bi = (audio_buf_info*) argp;
+            int l;
+            size_t k = 0;
+
+            debug(__FILE__": SNDCTL_DSP_GETOSPACE\n");
+
+            pa_threaded_mainloop_lock(i->mainloop);
+
+            fix_metrics(i);
+            
+            if (i->stream) {
+                if ((k = pa_stream_writable_size(i->stream)) == (size_t) -1)
+                    debug(__FILE__": pa_stream_writable_size(): %s\n", pa_strerror(pa_context_errno(i->context)));
+            } else
+                k = i->fragment_size * i->n_fragments;
+            
+            if (ioctl(i->thread_fd, SIOCINQ, &l) < 0) {
+                debug(__FILE__": SIOCINQ failed: %s\n", strerror(errno));
+                l = 0;
+            }
+
+            bi->fragsize = i->fragment_size;
+            bi->fragstotal = i->n_fragments;
+            bi->bytes = k > (size_t) l ? k - l : 0;
+            bi->fragments = bi->bytes / bi->fragsize;
+
+            pa_threaded_mainloop_unlock(i->mainloop);
+
+            debug(__FILE__": fragsize=%i, fragstotal=%i, bytes=%i, fragments=%i\n", bi->fragsize, bi->fragstotal, bi->bytes, bi->fragments);
+
+            break;
+        }
+            
+        default:
+            debug(__FILE__": unknwon ioctl 0x%08lx\n", request);
+
+            *_errno = EINVAL;
+            goto fail;
+    }
+
+    ret = 0;
+    
+fail:
+    
+    return ret;
+}
+
+int ioctl(int fd, unsigned long request, ...) {
+    fd_info *i;
+    va_list args;
+    void *argp;
+    int r, _errno = 0;
+
+    debug(__FILE__": ioctl()\n");
+
+    va_start(args, request);
+    argp = va_arg(args, void *);
+    va_end(args);
+
+    if (!function_enter()) {
+        LOAD_IOCTL_FUNC();
+        return _ioctl(fd, request, argp);
+    }
+
+    if (!(i = fd_info_find(fd))) {
+        function_exit();
+        LOAD_IOCTL_FUNC();
+        return _ioctl(fd, request, argp);
+    }
+
+    if (i->type == FD_INFO_MIXER)
+        r = mixer_ioctl(i, request, argp, &_errno);
+    else
+        r = dsp_ioctl(i, request, argp, &_errno);
+    
+    fd_info_unref(i);
+
+    if (_errno)
+        errno = _errno;
+
+    function_exit();
+    
+    return r;
+}
+
+int close(int fd) {
+    fd_info *i;
+
+    debug(__FILE__": close()\n");
+
+    if (!function_enter()) {
+        LOAD_CLOSE_FUNC();
+        return _close(fd);
+    }
+
+    if (!(i = fd_info_find(fd))) {
+        function_exit();
+        LOAD_CLOSE_FUNC();
+        return _close(fd);
+    }
+
+    fd_info_remove_from_list(i);
+    fd_info_unref(i);
+    
+    function_exit();
+
+    return 0;
+}
+
+int open64(const char *filename, int flags, ...) {
+    va_list args;
+    mode_t mode = 0;
+
+    debug(__FILE__": open64()\n");
+    
+    va_start(args, flags);
+    if (flags & O_CREAT)
+        mode = va_arg(args, mode_t);
+    va_end(args);
+
+    if (strcmp(filename, "/dev/dsp") != 0 &&
+        strcmp(filename, "/dev/adsp") != 0 &&
+        strcmp(filename, "/dev/mixer") != 0) {
+        LOAD_OPEN64_FUNC();
+        return _open64(filename, flags, mode);
+    }
+
+    return open(filename, flags, mode);
+}
+
+FILE* fopen(const char *filename, const char *mode) {
+    FILE *f = NULL;
+    int fd;
+
+    debug(__FILE__": fopen()\n");
+
+    if (strcmp(filename, "/dev/dsp") != 0 &&
+        strcmp(filename, "/dev/adsp") != 0 &&
+        strcmp(filename, "/dev/mixer") != 0) {
+        LOAD_FOPEN_FUNC();
+        return _fopen(filename, mode);
+    }
+
+    if (strcmp(mode, "wb") != 0) {
+        errno = EACCES;
+        return NULL;
+    }
+
+    if ((fd = open(filename, O_WRONLY)) < 0)
+        return NULL;
+
+    if (!(f = fdopen(fd, "wb"))) {
+        close(fd);
+        return NULL;
+    }
+    
+    return f;
+}
+
+FILE *fopen64(const char *filename, const char *mode) {
+
+    debug(__FILE__": fopen64()\n");
+
+    if (strcmp(filename, "/dev/dsp") != 0 &&
+        strcmp(filename, "/dev/adsp") != 0 &&
+        strcmp(filename, "/dev/mixer") != 0) {
+        LOAD_FOPEN64_FUNC();
+        return _fopen64(filename, mode);
+    }
+
+    return fopen(filename, mode);
+}
+
+int fclose(FILE *f) {
+    fd_info *i;
+
+    debug(__FILE__": fclose()\n");
+
+    if (!function_enter()) {
+        LOAD_FCLOSE_FUNC();
+        return _fclose(f);
+    }
+
+    if (!(i = fd_info_find(fileno(f)))) {
+        function_exit();
+        LOAD_FCLOSE_FUNC();
+        return _fclose(f);
+    }
+
+    fd_info_remove_from_list(i);
+
+    /* Dirty trick to avoid that the fd is not freed twice, once by us
+     * and once by the real fclose() */
+    i->app_fd = -1;
+    
+    fd_info_unref(i);
+    
+    function_exit();
+
+    LOAD_FCLOSE_FUNC();
+    return _fclose(f);
+}
diff --git a/src/utils/padsp.in b/src/utils/padsp.in
new file mode 100644
index 00000000..d82e92fe
--- /dev/null
+++ b/src/utils/padsp.in
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+# $Id$
+#
+# This file is part of polypaudio.
+#
+# polypaudio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# polypaudio 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 Lesser General Public License
+# along with polypaudio; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+# USA.
+
+if [ x"$LD_PRELOAD" = x ] ; then
+   LD_PRELOAD="@LIBPOLYPDSP@"
+else
+   LD_PRELOAD="$LD_PRELOAD @LIBPOLYPDSP@"
+fi
+
+export LD_PRELOAD
+
+exec "$@"