[pulseaudio-discuss] [PATCH] Implement Fortemedia SMA processing.

Alban Browaeys prahal at yahoo.com
Wed Jan 5 16:32:00 PST 2011


>From 853a4d96bf2624ef30f86cf4819382949d039c87 Mon Sep 17 00:00:00 2001
From: Alban Browaeys <prahal at yahoo.com>
Date: Wed, 5 Jan 2011 17:13:04 +0100
Subject: [PATCH] Implement Fortemedia SMA processing.

Those small array microphones returns two channels of opposite
phase thus the default remap in pulseaudio doing the sum output
silence.

Signed-off-by: Alban Browaeys <prahal at yahoo.com>
---
 src/Makefile.am                 |   10 +-
 src/modules/module-fmaudiosma.c |  692 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 700 insertions(+), 2 deletions(-)
 create mode 100644 src/modules/module-fmaudiosma.c

diff --git a/src/Makefile.am b/src/Makefile.am
index 15a4644..755b01d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1036,7 +1036,8 @@ modlibexec_LTLIBRARIES += \
 		module-cork-music-on-phone.la \
 		module-loopback.la \
 		module-virtual-sink.la \
-		module-virtual-source.la
+		module-virtual-source.la \
+		module-fmaudiosma.la
 
 # See comment at librtp.la above
 if !OS_IS_WIN32
@@ -1318,7 +1319,8 @@ SYMDEF_FILES = \
 		modules/dbus/module-dbus-protocol-symdef.h \
 		modules/module-loopback-symdef.h \
 		modules/module-virtual-sink-symdef.h \
-		modules/module-virtual-source-symdef.h
+		modules/module-virtual-source-symdef.h \
+		modules/module-fmaudiosma-symdef.h
 
 EXTRA_DIST += $(SYMDEF_FILES)
 BUILT_SOURCES += $(SYMDEF_FILES)
@@ -1495,6 +1497,10 @@ module_virtual_source_la_SOURCES = modules/module-virtual-source.c
 module_virtual_source_la_LDFLAGS = $(MODULE_LDFLAGS)
 module_virtual_source_la_LIBADD = $(AM_LIBADD) libpulsecore- at PA_MAJORMINOR@.la libpulsecommon- at PA_MAJORMINOR@.la libpulse.la
 
+module_fmaudiosma_la_SOURCES = modules/module-fmaudiosma.c
+module_fmaudiosma_la_LDFLAGS = $(MODULE_LDFLAGS)
+module_fmaudiosma_la_LIBADD = $(AM_LIBADD) libpulsecore- at PA_MAJORMINOR@.la libpulsecommon- at PA_MAJORMINOR@.la libpulse.la
+
 # X11
 
 module_x11_bell_la_SOURCES = modules/x11/module-x11-bell.c
diff --git a/src/modules/module-fmaudiosma.c b/src/modules/module-fmaudiosma.c
new file mode 100644
index 0000000..636500e
--- /dev/null
+++ b/src/modules/module-fmaudiosma.c
@@ -0,0 +1,692 @@
+/***
+    This file is part of PulseAudio.
+
+    Copyright 2011 Alban Browaeys <prahal at yahoo.com>
+
+    Base on module-echo-cancel.c
+
+        Copyright 2010 Wim Taymans <wim.taymans at gmail.com>
+
+    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 2.1 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 <math.h>
+
+#include <pulse/xmalloc.h>
+#include <pulse/i18n.h>
+#include <pulse/timeval.h>
+#include <pulse/rtclock.h>
+
+#include <pulsecore/atomic.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/core-error.h>
+#include <pulsecore/namereg.h>
+#include <pulsecore/sink.h>
+#include <pulsecore/module.h>
+#include <pulsecore/core-rtclock.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/core-error.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/log.h>
+#include <pulsecore/thread.h>
+#include <pulsecore/thread-mq.h>
+#include <pulsecore/rtpoll.h>
+#include <pulsecore/sample-util.h>
+#include <pulsecore/ltdl-helper.h>
+
+#include "module-fmaudiosma-symdef.h"
+
+PA_MODULE_AUTHOR("Alban Browaeys");
+PA_MODULE_DESCRIPTION("Fortemedia Small Microphones Array");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(FALSE);
+PA_MODULE_USAGE(
+        _("source_name=<name for the source> "
+          "source_properties=<properties for the source> "
+          "source_master=<name of source to filter> "
+          "format=<sample format> "
+          "rate=<sample rate> "
+          "channels=<number of channels> "
+          "channel_map=<channel map> "
+        ));
+
+#define MEMBLOCKQ_MAXLENGTH (16*1024*1024)
+
+/* Common data structures */
+
+typedef struct pa_fmaudiosma pa_fmaudiosma;
+
+struct pa_fmaudiosma {
+    pa_bool_t   (*init)                 (pa_core *c,
+                                         pa_fmaudiosma *fs,
+                                         pa_sample_spec *source_ss,
+                                         pa_channel_map *source_map);
+    void        (*run)                  (pa_fmaudiosma *fs, const uint8_t *rec, uint8_t *out, int n);
+    void        (*done)                 (pa_fmaudiosma *fs);
+};
+
+/* FmAudio SMA functions */
+pa_bool_t pa_fmaudiosma_init(pa_core *c, pa_fmaudiosma *fs,
+                           pa_sample_spec *source_ss, pa_channel_map *source_map);
+void pa_fmaudiosma_run(pa_fmaudiosma *fs, const uint8_t *rec, uint8_t *out, int n);
+void pa_fmaudiosma_done(pa_fmaudiosma *fs);
+
+static void pa_fmaudiosma_fixate_spec(pa_sample_spec *source_ss, pa_channel_map *source_map)
+{
+    source_ss->format = PA_SAMPLE_FLOAT32NE;
+    source_ss->channels = 2;
+    pa_channel_map_init_stereo(source_map);
+}
+
+pa_bool_t pa_fmaudiosma_init(pa_core *c, pa_fmaudiosma *fs,
+                           pa_sample_spec *source_ss, pa_channel_map *source_map)
+{
+    pa_fmaudiosma_fixate_spec(source_ss, source_map);
+
+    return TRUE;
+}
+
+
+void pa_fmaudiosma_run(pa_fmaudiosma *fs, const uint8_t *rec, uint8_t *out, int n) {
+    unsigned i;
+
+    float *d, *s;
+    int n_frames = n / (sizeof(float) *  2);
+    memset(out, 0, n_frames * sizeof (float) * 2);
+
+    d = (float *)out;
+    s = (float *)rec;
+    for (i = n_frames; i > 0; i--, s += 2, d += 2)
+	d[0] = d[1] = s[0] - (s[0] + s[1]);
+}
+
+void pa_fmaudiosma_done(pa_fmaudiosma *fs)
+{
+}
+
+/* This module creates a new (virtual) source and sink.
+ *
+ * The data sent to the new sink is kept in a memblockq before being
+ * forwarded to the real sink_master.
+ *
+ * Data read from source_master is matched against the saved sink data and
+ * echo canceled data is then pushed onto the new source.
+ *
+ * Both source and sink masters have their own threads to push/pull data
+ * respectively. We however perform all our actions in the source IO thread.
+ * To do this we send all played samples to the source IO thread where they
+ * are then pushed into the memblockq.
+ *
+ * Alignment is performed in two steps:
+ *
+ * 1) when something happens that requires quick adjustement of the alignment of
+ *    capture and playback samples, we perform a resync. This adjusts the
+ *    position in the playback memblock to the requested sample. Quick
+ *    adjustements include moving the playback samples before the capture
+ *    samples (because else the echo canceler does not work) or when the
+ *    playback pointer drifts too far away.
+ *
+ * 2) periodically check the difference between capture and playback. we use a
+ *    low and high watermark for adjusting the alignment. playback should always
+ *    be before capture and the difference should not be bigger than one frame
+ *    size. We would ideally like to resample the sink_input but most driver
+ *    don't give enough accuracy to be able to do that right now.
+ */
+
+struct userdata {
+    pa_core *core;
+    pa_module *module;
+
+    pa_fmaudiosma *fs;
+
+    pa_source *source;
+    pa_bool_t source_auto_desc;
+    pa_source_output *source_output;
+    pa_memblockq *source_memblockq; /* echo canceler needs fixed sized chunks */
+    size_t source_skip;
+
+    int64_t recv_counter;
+
+    FILE *captured_file;
+    FILE *played_file;
+    FILE *canceled_file;
+};
+
+
+static const char* const valid_modargs[] = {
+    "source_name",
+    "source_properties",
+    "source_master",
+    "format",
+    "rate",
+    "channels",
+    "channel_map",
+    NULL
+};
+
+enum {
+    SOURCE_OUTPUT_MESSAGE_POST = PA_SOURCE_OUTPUT_MESSAGE_MAX,
+    SOURCE_OUTPUT_MESSAGE_REWIND,
+    SOURCE_OUTPUT_MESSAGE_LATENCY_SNAPSHOT,
+    SOURCE_OUTPUT_MESSAGE_APPLY_DIFF_TIME
+};
+
+enum {
+    SINK_INPUT_MESSAGE_LATENCY_SNAPSHOT
+};
+
+
+/* Called from source I/O thread context */
+static int source_process_msg_cb(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
+    struct userdata *u = PA_SOURCE(o)->userdata;
+
+    switch (code) {
+
+        case PA_SOURCE_MESSAGE_GET_LATENCY:
+
+            /* The source is _put() before the source output is, so let's
+             * make sure we don't access it in that time. Also, the
+             * source output is first shut down, the source second. */
+            if (!PA_SOURCE_IS_LINKED(u->source->thread_info.state) ||
+                !PA_SOURCE_OUTPUT_IS_LINKED(u->source_output->thread_info.state)) {
+                *((pa_usec_t*) data) = 0;
+                return 0;
+            }
+
+            *((pa_usec_t*) data) =
+
+                /* Get the latency of the master source */
+                pa_source_get_latency_within_thread(u->source_output->source) +
+                /* Add the latency internal to our source output on top */
+                pa_bytes_to_usec(pa_memblockq_get_length(u->source_output->thread_info.delay_memblockq), &u->source_output->source->sample_spec);
+
+            return 0;
+
+    }
+
+    return pa_source_process_msg(o, code, data, offset, chunk);
+}
+
+/* Called from main context */
+static int source_set_state_cb(pa_source *s, pa_source_state_t state) {
+    struct userdata *u;
+
+    pa_source_assert_ref(s);
+    pa_assert_se(u = s->userdata);
+
+    if (!PA_SOURCE_IS_LINKED(state) ||
+        !PA_SOURCE_OUTPUT_IS_LINKED(pa_source_output_get_state(u->source_output)))
+        return 0;
+
+    pa_source_output_cork(u->source_output, state == PA_SOURCE_SUSPENDED);
+    return 0;
+}
+
+/* Called from I/O thread context */
+static void source_update_requested_latency_cb(pa_source *s) {
+    struct userdata *u;
+
+    pa_source_assert_ref(s);
+    pa_assert_se(u = s->userdata);
+
+    if (!PA_SOURCE_IS_LINKED(u->source->thread_info.state) ||
+        !PA_SOURCE_OUTPUT_IS_LINKED(u->source_output->thread_info.state))
+        return;
+
+    pa_log_debug("Source update requested latency");
+
+    /* Just hand this one over to the master source */
+    pa_source_output_set_requested_latency_within_thread(
+            u->source_output,
+            pa_source_get_requested_latency_within_thread(s));
+}
+
+/* Called from main context */
+static void source_set_volume_cb(pa_source *s) {
+    struct userdata *u;
+
+    pa_source_assert_ref(s);
+    pa_assert_se(u = s->userdata);
+
+    if (!PA_SOURCE_IS_LINKED(pa_source_get_state(s)) ||
+        !PA_SOURCE_OUTPUT_IS_LINKED(pa_source_output_get_state(u->source_output)))
+        return;
+
+    /* FIXME, no volume control in source_output, set volume at the master */
+    pa_source_set_volume(u->source_output->source, &s->volume, TRUE);
+}
+
+static void source_get_volume_cb(pa_source *s) {
+    struct userdata *u;
+
+    pa_source_assert_ref(s);
+    pa_assert_se(u = s->userdata);
+
+    if (!PA_SOURCE_IS_LINKED(pa_source_get_state(s)) ||
+        !PA_SOURCE_OUTPUT_IS_LINKED(pa_source_output_get_state(u->source_output)))
+        return;
+
+    /* FIXME, no volume control in source_output, get the info from the master */
+    pa_source_get_volume(u->source_output->source, TRUE);
+
+    if (pa_cvolume_equal(&s->volume,&u->source_output->source->volume))
+        /* no change */
+        return;
+
+    s->volume = u->source_output->source->volume;
+    pa_source_set_soft_volume(s, NULL);
+}
+
+
+/* Called from main context */
+static void source_set_mute_cb(pa_source *s) {
+    struct userdata *u;
+
+    pa_source_assert_ref(s);
+    pa_assert_se(u = s->userdata);
+
+    if (!PA_SOURCE_IS_LINKED(pa_source_get_state(s)) ||
+        !PA_SOURCE_OUTPUT_IS_LINKED(pa_source_output_get_state(u->source_output)))
+        return;
+
+    /* FIXME, no volume control in source_output, set mute at the master */
+    pa_source_set_mute(u->source_output->source, TRUE, TRUE);
+}
+
+/* Called from main context */
+static void source_get_mute_cb(pa_source *s) {
+    struct userdata *u;
+
+    pa_source_assert_ref(s);
+    pa_assert_se(u = s->userdata);
+
+    if (!PA_SOURCE_IS_LINKED(pa_source_get_state(s)) ||
+        !PA_SOURCE_OUTPUT_IS_LINKED(pa_source_output_get_state(u->source_output)))
+        return;
+
+    /* FIXME, no volume control in source_output, get the info from the master */
+    pa_source_get_mute(u->source_output->source, TRUE);
+}
+
+/* Called from input thread context */
+static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk) {
+    struct userdata *u;
+    pa_memchunk cchunk;
+    uint8_t *rdata, *cdata;
+
+    pa_source_output_assert_ref(o);
+    pa_source_output_assert_io_context(o);
+    pa_assert_se(u = o->userdata);
+
+    if (!PA_SOURCE_OUTPUT_IS_LINKED(pa_source_output_get_state(u->source_output))) {
+        pa_log("push when no link?");
+        return;
+    }
+
+    rdata = pa_memblock_acquire(chunk->memblock);
+    rdata += chunk->index;
+
+    cchunk.index = 0;
+    cchunk.length = chunk->length;
+    cchunk.memblock = pa_memblock_new(u->source->core->mempool, cchunk.length);
+    cdata = pa_memblock_acquire(cchunk.memblock);
+
+    u->fs->run(u->fs, rdata, cdata, chunk->length);
+
+    pa_memblock_release(cchunk.memblock);
+    pa_memblock_release(chunk->memblock);
+
+    /* forward the data to the virtual source */
+    pa_source_post(u->source, &cchunk);
+    pa_memblock_unref(cchunk.memblock);
+}
+
+/* Called from input thread context */
+static void source_output_process_rewind_cb(pa_source_output *o, size_t nbytes) {
+    struct userdata *u;
+
+    pa_source_output_assert_ref(o);
+    pa_source_output_assert_io_context(o);
+    pa_assert_se(u = o->userdata);
+
+}
+
+
+/* Called from output thread context */
+static int source_output_process_msg_cb(pa_msgobject *obj, int code, void *data, int64_t offset, pa_memchunk *chunk) {
+    return pa_source_output_process_msg(obj, code, data, offset, chunk);
+}
+
+static void source_output_attach_cb(pa_source_output *o) {
+    struct userdata *u;
+
+    pa_source_output_assert_ref(o);
+    pa_source_output_assert_io_context(o);
+    pa_assert_se(u = o->userdata);
+
+    pa_source_set_rtpoll(u->source, o->source->thread_info.rtpoll);
+    pa_source_set_latency_range_within_thread(u->source, o->source->thread_info.min_latency, o->source->thread_info.max_latency);
+    pa_source_set_fixed_latency_within_thread(u->source, o->source->thread_info.fixed_latency);
+    pa_source_set_max_rewind_within_thread(u->source, pa_source_output_get_max_rewind(o));
+
+    pa_log_debug("Source output %p attach", o);
+
+    pa_source_attach_within_thread(u->source);
+}
+
+
+/* Called from output thread context */
+static void source_output_detach_cb(pa_source_output *o) {
+    struct userdata *u;
+
+    pa_source_output_assert_ref(o);
+    pa_source_output_assert_io_context(o);
+    pa_assert_se(u = o->userdata);
+
+    pa_source_detach_within_thread(u->source);
+    pa_source_set_rtpoll(u->source, NULL);
+
+    pa_log_debug("Source output %p detach", o);
+
+}
+
+/* Called from output thread context */
+static void source_output_state_change_cb(pa_source_output *o, pa_source_output_state_t state) {
+    struct userdata *u;
+
+    pa_source_output_assert_ref(o);
+    pa_source_output_assert_io_context(o);
+    pa_assert_se(u = o->userdata);
+
+    pa_log_debug("Source output %p state %d", o, state);
+}
+
+/* Called from main thread */
+static void source_output_kill_cb(pa_source_output *o) {
+    struct userdata *u;
+
+    pa_source_output_assert_ref(o);
+    pa_assert_ctl_context();
+    pa_assert_se(u = o->userdata);
+
+    /* The order here matters! We first kill the source output, followed
+     * by the source. That means the source callbacks must be protected
+     * against an unconnected source output! */
+    pa_source_output_unlink(u->source_output);
+    pa_source_unlink(u->source);
+
+    pa_source_output_unref(u->source_output);
+    u->source_output = NULL;
+
+    pa_source_unref(u->source);
+    u->source = NULL;
+
+    pa_log_debug("Source output kill %p", o);
+
+    pa_module_unload_request(u->module, TRUE);
+}
+
+/* Called from main thread */
+static pa_bool_t source_output_may_move_to_cb(pa_source_output *o, pa_source *dest) {
+    struct userdata *u;
+
+    pa_source_output_assert_ref(o);
+    pa_assert_ctl_context();
+    pa_assert_se(u = o->userdata);
+
+    return TRUE;
+}
+
+
+
+/* Called from main thread */
+static void source_output_moving_cb(pa_source_output *o, pa_source *dest) {
+    struct userdata *u;
+
+    pa_source_output_assert_ref(o);
+    pa_assert_ctl_context();
+    pa_assert_se(u = o->userdata);
+
+    if (dest) {
+        pa_source_set_asyncmsgq(u->source, dest->asyncmsgq);
+        pa_source_update_flags(u->source, PA_SOURCE_LATENCY|PA_SOURCE_DYNAMIC_LATENCY, dest->flags);
+    } else
+        pa_source_set_asyncmsgq(u->source, NULL);
+
+    if (u->source_auto_desc && dest) {
+        const char *z;
+        pa_proplist *pl;
+
+        pl = pa_proplist_new();
+        z = pa_proplist_gets(dest->proplist, PA_PROP_DEVICE_DESCRIPTION);
+        pa_proplist_setf(pl, PA_PROP_DEVICE_DESCRIPTION, "FmAudio SMA Source %s on %s",
+                         pa_proplist_gets(u->source->proplist, "device.fmaudiosma.name"), z ? z : dest->name);
+
+        pa_source_update_proplist(u->source, PA_UPDATE_REPLACE, pl);
+        pa_proplist_free(pl);
+    }
+}
+
+int pa__init(pa_module*m) {
+    struct userdata *u;
+    pa_sample_spec source_ss;
+    pa_channel_map source_map;
+    pa_modargs *ma;
+    pa_source *source_master=NULL;
+    pa_source_output_new_data source_output_data;
+    pa_source_new_data source_data;
+    pa_memchunk silence;
+
+    pa_assert(m);
+
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log("Failed to parse module arguments.");
+        goto fail;
+    }
+
+    if (!(source_master = pa_namereg_get(m->core, pa_modargs_get_value(ma, "source_master", NULL), PA_NAMEREG_SOURCE))) {
+        pa_log("Master source not found");
+        goto fail;
+    }
+    pa_assert(source_master);
+
+    source_ss = source_master->sample_spec;
+    source_map = source_master->channel_map;
+    if (pa_modargs_get_sample_spec_and_channel_map(ma, &source_ss, &source_map, PA_CHANNEL_MAP_DEFAULT) < 0) {
+        pa_log("Invalid sample format specification or channel map");
+        goto fail;
+    }
+
+    u = pa_xnew0(struct userdata, 1);
+    if (!u) {
+        pa_log("Failed to alloc userdata");
+        goto fail;
+    }
+    u->core = m->core;
+    u->module = m;
+    m->userdata = u;
+
+    u->fs = pa_xnew0(pa_fmaudiosma, 1);
+    if (!u->fs) {
+        pa_log("Failed to alloc FmAudio SMA");
+        goto fail;
+    }
+
+
+    u->fs->init = pa_fmaudiosma_init;
+    u->fs->run = pa_fmaudiosma_run;
+    u->fs->done = pa_fmaudiosma_done;
+
+    if (u->fs->init) {
+        if (!u->fs->init(u->core, u->fs, &source_ss, &source_map)) {
+            pa_log("Failed to init FmAudio SMA engine");
+            goto fail;
+        }
+    }
+
+    /* Create source */
+    pa_source_new_data_init(&source_data);
+    source_data.driver = __FILE__;
+    source_data.module = m;
+    if (!(source_data.name = pa_xstrdup(pa_modargs_get_value(ma, "source_name", NULL))))
+        source_data.name = pa_sprintf_malloc("%s.fmaudiosma", source_master->name);
+    pa_source_new_data_set_sample_spec(&source_data, &source_ss);
+    pa_source_new_data_set_channel_map(&source_data, &source_map);
+    pa_proplist_sets(source_data.proplist, PA_PROP_DEVICE_MASTER_DEVICE, source_master->name);
+    pa_proplist_sets(source_data.proplist, PA_PROP_DEVICE_CLASS, "filter");
+    pa_proplist_sets(source_data.proplist, "device.fmaudiosma.name", source_data.name);
+
+    if (pa_modargs_get_proplist(ma, "source_properties", source_data.proplist, PA_UPDATE_REPLACE) < 0) {
+        pa_log("Invalid properties");
+        pa_source_new_data_done(&source_data);
+        goto fail;
+    }
+
+    if ((u->source_auto_desc = !pa_proplist_contains(source_data.proplist, PA_PROP_DEVICE_DESCRIPTION))) {
+        const char *z;
+
+        z = pa_proplist_gets(source_master->proplist, PA_PROP_DEVICE_DESCRIPTION);
+        pa_proplist_setf(source_data.proplist, PA_PROP_DEVICE_DESCRIPTION, "FmAudio SMA Source %s on %s", source_data.name, z ? z : source_master->name);
+    }
+
+    u->source = pa_source_new(m->core, &source_data,
+                          PA_SOURCE_HW_MUTE_CTRL|PA_SOURCE_HW_VOLUME_CTRL|PA_SOURCE_DECIBEL_VOLUME|
+                          (source_master->flags & (PA_SOURCE_LATENCY|PA_SOURCE_DYNAMIC_LATENCY)));
+    pa_source_new_data_done(&source_data);
+
+    if (!u->source) {
+        pa_log("Failed to create source.");
+        goto fail;
+    }
+
+    u->source->parent.process_msg = source_process_msg_cb;
+    u->source->set_state = source_set_state_cb;
+    u->source->update_requested_latency = source_update_requested_latency_cb;
+    u->source->set_volume = source_set_volume_cb;
+    u->source->set_mute = source_set_mute_cb;
+    u->source->get_volume = source_get_volume_cb;
+    u->source->get_mute = source_get_mute_cb;
+    u->source->userdata = u;
+
+    pa_source_set_asyncmsgq(u->source, source_master->asyncmsgq);
+
+    /* Create source output */
+    pa_source_output_new_data_init(&source_output_data);
+    source_output_data.driver = __FILE__;
+    source_output_data.module = m;
+    source_output_data.source = source_master;
+    /* FIXME
+       source_output_data.flags = PA_SOURCE_OUTPUT_DONT_INHIBIT_AUTO_SUSPEND; */
+
+    pa_proplist_sets(source_output_data.proplist, PA_PROP_MEDIA_NAME, "FmAudio SMA Source Stream");
+    pa_proplist_sets(source_output_data.proplist, PA_PROP_MEDIA_ROLE, "filter");
+    pa_source_output_new_data_set_sample_spec(&source_output_data, &source_ss);
+    pa_source_output_new_data_set_channel_map(&source_output_data, &source_map);
+
+    pa_source_output_new(&u->source_output, m->core, &source_output_data);
+    pa_source_output_new_data_done(&source_output_data);
+
+    if (!u->source_output)
+        goto fail;
+
+    u->source_output->parent.process_msg = source_output_process_msg_cb;
+    u->source_output->push = source_output_push_cb;
+    u->source_output->process_rewind = source_output_process_rewind_cb;
+    u->source_output->kill = source_output_kill_cb;
+    u->source_output->attach = source_output_attach_cb;
+    u->source_output->detach = source_output_detach_cb;
+    u->source_output->state_change = source_output_state_change_cb;
+    u->source_output->may_move_to = source_output_may_move_to_cb;
+    u->source_output->moving = source_output_moving_cb;
+    u->source_output->userdata = u;
+
+    pa_silence_memchunk_get(&m->core->silence_cache, m->core->mempool, &silence, &source_ss, 0);
+
+    u->source_memblockq = pa_memblockq_new(0, MEMBLOCKQ_MAXLENGTH, 0,
+        pa_frame_size(&source_ss), 1, 1, 0, &silence);
+
+    pa_memblock_unref(silence.memblock);
+
+    if (!u->source_memblockq) {
+        pa_log("Failed to create memblockq.");
+        goto fail;
+    }
+
+    pa_source_put(u->source);
+    pa_source_output_put(u->source_output);
+
+    pa_modargs_free(ma);
+
+    return 0;
+
+ fail:
+    if (ma)
+        pa_modargs_free(ma);
+
+    pa__done(m);
+
+    return -1;
+}
+
+int pa__get_n_used(pa_module *m) {
+    struct userdata *u;
+
+    pa_assert(m);
+    pa_assert_se(u = m->userdata);
+
+    return pa_source_linked_by(u->source);
+}
+
+void pa__done(pa_module*m) {
+    struct userdata *u;
+
+    pa_assert(m);
+
+    if (!(u = m->userdata))
+        return;
+
+    /* See comments in source_output_kill_cb() above regarding
+     * destruction order! */
+
+    if (u->source_output)
+        pa_source_output_unlink(u->source_output);
+
+    if (u->source)
+        pa_source_unlink(u->source);
+
+    if (u->source_output)
+        pa_source_output_unref(u->source_output);
+
+    if (u->source)
+        pa_source_unref(u->source);
+
+    if (u->source_memblockq)
+        pa_memblockq_free(u->source_memblockq);
+
+    if (u->fs) {
+        if (u->fs->done)
+            u->fs->done(u->fs);
+
+        pa_xfree(u->fs);
+    }
+
+    pa_xfree(u);
+}
-- 
1.7.2.3






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