really create glitch-free branch

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/glitch-free@2120 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 272 insertions, 0 deletions

diff --git a/src/modules/module-detect.c b/src/modules/module-detect.c
new file mode 100644
index 00000000..ee650dfd
--- /dev/null
+++ b/src/modules/module-detect.c
@@ -0,0 +1,272 @@
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2006 Lennart Poettering
+  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
+  Copyright 2006 Diego Pettenò
+
+  PulseAudio 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.
+
+  PulseAudio 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 PulseAudio; 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
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/core-error.h>
+#include <pulsecore/module.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/log.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/macro.h>
+
+#include "module-detect-symdef.h"
+
+PA_MODULE_AUTHOR("Lennart Poettering");
+PA_MODULE_DESCRIPTION("Detect available audio hardware and load matching drivers");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(TRUE);
+PA_MODULE_USAGE("just-one=<boolean>");
+
+static const char* const valid_modargs[] = {
+    "just-one",
+    NULL
+};
+
+#ifdef HAVE_ALSA
+
+static int detect_alsa(pa_core *c, int just_one) {
+    FILE *f;
+    int n = 0, n_sink = 0, n_source = 0;
+
+    if (!(f = fopen("/proc/asound/devices", "r"))) {
+
+        if (errno != ENOENT)
+            pa_log_error("open(\"/proc/asound/devices\") failed: %s", pa_cstrerror(errno));
+
+        return -1;
+    }
+
+    while (!feof(f)) {
+        char line[64], args[64];
+        unsigned device, subdevice;
+        int is_sink;
+
+        if (!fgets(line, sizeof(line), f))
+            break;
+
+        line[strcspn(line, "\r\n")] = 0;
+
+        if (pa_endswith(line, "digital audio playback"))
+            is_sink = 1;
+        else if (pa_endswith(line, "digital audio capture"))
+            is_sink = 0;
+        else
+            continue;
+
+        if (just_one && is_sink && n_sink >= 1)
+            continue;
+
+        if (just_one && !is_sink && n_source >= 1)
+            continue;
+
+        if (sscanf(line, " %*i: [%u- %u]: ", &device, &subdevice) != 2)
+            continue;
+
+        /* Only one sink per device */
+        if (subdevice != 0)
+            continue;
+
+        pa_snprintf(args, sizeof(args), "device=hw:%u", device);
+        if (!pa_module_load(c, is_sink ? "module-alsa-sink" : "module-alsa-source", args))
+            continue;
+
+        n++;
+
+        if (is_sink)
+            n_sink++;
+        else
+            n_source++;
+    }
+
+    fclose(f);
+
+    return n;
+}
+#endif
+
+#ifdef HAVE_OSS
+static int detect_oss(pa_core *c, int just_one) {
+    FILE *f;
+    int n = 0, b = 0;
+
+    if (!(f = fopen("/dev/sndstat", "r")) &&
+        !(f = fopen("/proc/sndstat", "r")) &&
+        !(f = fopen("/proc/asound/oss/sndstat", "r"))) {
+
+        if (errno != ENOENT)
+            pa_log_error("failed to open OSS sndstat device: %s", pa_cstrerror(errno));
+
+        return -1;
+    }
+
+    while (!feof(f)) {
+        char line[64], args[64];
+        unsigned device;
+
+        if (!fgets(line, sizeof(line), f))
+            break;
+
+        line[strcspn(line, "\r\n")] = 0;
+
+        if (!b) {
+             b = strcmp(line, "Audio devices:") == 0 || strcmp(line, "Installed devices:") == 0;
+            continue;
+        }
+
+        if (line[0] == 0)
+            break;
+
+        if (sscanf(line, "%u: ", &device) == 1) {
+            if (device == 0)
+                pa_snprintf(args, sizeof(args), "device=/dev/dsp");
+            else
+                pa_snprintf(args, sizeof(args), "device=/dev/dsp%u", device);
+
+            if (!pa_module_load(c, "module-oss", args))
+                continue;
+
+        } else if (sscanf(line, "pcm%u: ", &device) == 1) {
+            /* FreeBSD support, the devices are named /dev/dsp0.0, dsp0.1 and so on */
+            pa_snprintf(args, sizeof(args), "device=/dev/dsp%u.0", device);
+
+            if (!pa_module_load(c, "module-oss", args))
+                continue;
+        }
+
+        n++;
+
+        if (just_one)
+            break;
+    }
+
+    fclose(f);
+    return n;
+}
+#endif
+
+#ifdef HAVE_SOLARIS
+static int detect_solaris(pa_core *c, int just_one) {
+    struct stat s;
+    const char *dev;
+    char args[64];
+
+    dev = getenv("AUDIODEV");
+    if (!dev)
+        dev = "/dev/audio";
+
+    if (stat(dev, &s) < 0) {
+        if (errno != ENOENT)
+            pa_log_error("failed to open device %s: %s", dev, pa_cstrerror(errno));
+        return -1;
+    }
+
+    if (!S_ISCHR(s.st_mode))
+        return 0;
+
+    pa_snprintf(args, sizeof(args), "device=%s", dev);
+
+    if (!pa_module_load(c, "module-solaris", args))
+        return 0;
+
+    return 1;
+}
+#endif
+
+#ifdef OS_IS_WIN32
+static int detect_waveout(pa_core *c, int just_one) {
+    /*
+     * FIXME: No point in enumerating devices until the plugin supports
+     * selecting anything but the first.
+     */
+    if (!pa_module_load(c, "module-waveout", ""))
+        return 0;
+
+    return 1;
+}
+#endif
+
+int pa__init(pa_module*m) {
+    pa_bool_t just_one = FALSE;
+    int n = 0;
+    pa_modargs *ma;
+
+    pa_assert(m);
+
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log("Failed to parse module arguments");
+        goto fail;
+    }
+
+    if (pa_modargs_get_value_boolean(ma, "just-one", &just_one) < 0) {
+        pa_log("just_one= expects a boolean argument.");
+        goto fail;
+    }
+
+#if HAVE_ALSA
+    if ((n = detect_alsa(m->core, just_one)) <= 0)
+#endif
+#if HAVE_OSS
+    if ((n = detect_oss(m->core, just_one)) <= 0)
+#endif
+#if HAVE_SOLARIS
+    if ((n = detect_solaris(m->core, just_one)) <= 0)
+#endif
+#if OS_IS_WIN32
+    if ((n = detect_waveout(m->core, just_one)) <= 0)
+#endif
+    {
+        pa_log_warn("failed to detect any sound hardware.");
+        goto fail;
+    }
+
+    pa_log_info("loaded %i modules.", n);
+
+    /* We were successful and can unload ourselves now. */
+    pa_module_unload_request(m);
+
+    pa_modargs_free(ma);
+
+    return 0;
+
+fail:
+    if (ma)
+        pa_modargs_free(ma);
+
+    return -1;
+}