add module-pipe-source

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@180 fefdeb5f-60dc-0310-8127-8f9354f1896f

polyp/module-pipe-source.c

@@ -0,0 +1,202 @@
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU 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 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
+
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+
+#include "iochannel.h"
+#include "source.h"
+#include "module.h"
+#include "util.h"
+#include "modargs.h"
+#include "xmalloc.h"
+#include "log.h"
+
+#define DEFAULT_FIFO_NAME "/tmp/music.input"
+#define DEFAULT_SOURCE_NAME "fifo_input"
+
+struct userdata {
+    struct pa_core *core;
+
+    char *filename;
+    
+    struct pa_source *source;
+    struct pa_iochannel *io;
+    struct pa_module *module;
+    struct pa_memchunk chunk;
+};
+
+static const char* const valid_modargs[] = {
+    "file",
+    "rate",
+    "channels",
+    "format",
+    "source_name",
+    NULL
+};
+
+static void do_read(struct userdata *u) {
+    ssize_t r;
+    struct pa_memchunk chunk;
+    assert(u);
+
+    if (!pa_iochannel_is_readable(u->io))
+        return;
+
+    pa_module_set_used(u->module, pa_idxset_ncontents(u->source->outputs));
+
+    if (!u->chunk.memblock) {
+        u->chunk.memblock = pa_memblock_new(1024, u->core->memblock_stat);
+        u->chunk.index = chunk.length = 0;
+    }
+
+    assert(u->chunk.memblock && u->chunk.memblock->length > u->chunk.index);
+    if ((r = pa_iochannel_read(u->io, (uint8_t*) u->chunk.memblock->data + u->chunk.index, u->chunk.memblock->length - u->chunk.index)) <= 0) {
+        pa_log(__FILE__": read() failed: %s\n", strerror(errno));
+        return;
+    }
+
+    u->chunk.length = r;
+    pa_source_post(u->source, &u->chunk);
+    u->chunk.index += r;
+
+    if (u->chunk.index >= u->chunk.memblock->length) {
+        u->chunk.index = u->chunk.length = 0;
+        pa_memblock_unref(u->chunk.memblock);
+        u->chunk.memblock = NULL;
+    }
+}
+
+static void io_callback(struct pa_iochannel *io, void*userdata) {
+    struct userdata *u = userdata;
+    assert(u);
+    do_read(u);
+}
+
+int pa_module_init(struct pa_core *c, struct pa_module*m) {
+    struct userdata *u = NULL;
+    struct stat st;
+    const char *p;
+    int fd = -1;
+    struct pa_sample_spec ss;
+    struct pa_modargs *ma = NULL;
+    assert(c && m);
+    
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log(__FILE__": failed to parse module arguments\n");
+        goto fail;
+    }
+
+    ss = c->default_sample_spec;
+    if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
+        pa_log(__FILE__": invalid sample format specification\n");
+        goto fail;
+    }
+    
+    mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
+
+    if ((fd = open(p, O_RDWR)) < 0) {
+        pa_log(__FILE__": open('%s'): %s\n", p, strerror(errno));
+        goto fail;
+    }
+
+    pa_fd_set_cloexec(fd, 1);
+    
+    if (fstat(fd, &st) < 0) {
+        pa_log(__FILE__": fstat('%s'): %s\n", p, strerror(errno));
+        goto fail;
+    }
+
+    if (!S_ISFIFO(st.st_mode)) {
+        pa_log(__FILE__": '%s' is not a FIFO.\n", p);
+        goto fail;
+    }
+
+    u = pa_xmalloc0(sizeof(struct userdata));
+
+    u->filename = pa_xstrdup(p);
+    u->core = c;
+    
+    if (!(u->source = pa_source_new(c, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss))) {
+        pa_log(__FILE__": failed to create source.\n");
+        goto fail;
+    }
+    u->source->userdata = u;
+    pa_source_set_owner(u->source, m);
+    u->source->description = pa_sprintf_malloc("Unix FIFO source '%s'", p);
+    assert(u->source->description);
+
+    u->io = pa_iochannel_new(c->mainloop, fd, -1);
+    assert(u->io);
+    pa_iochannel_set_callback(u->io, io_callback, u);
+
+    u->chunk.memblock = NULL;
+    u->chunk.index = u->chunk.length = 0;
+    
+    u->module = m;
+    m->userdata = u;
+
+    pa_modargs_free(ma);
+    
+    return 0;
+
+fail:
+    if (ma)
+        pa_modargs_free(ma);
+        
+    if (fd >= 0)
+        close(fd);
+
+    pa_module_done(c, m);
+
+    return -1;
+}
+
+void pa_module_done(struct pa_core *c, struct pa_module*m) {
+    struct userdata *u;
+    assert(c && m);
+
+    if (!(u = m->userdata))
+        return;
+    
+    if (u->chunk.memblock)
+        pa_memblock_unref(u->chunk.memblock);
+        
+    pa_source_free(u->source);
+    pa_iochannel_free(u->io);
+
+    assert(u->filename);
+    unlink(u->filename);
+    pa_xfree(u->filename);
+    
+    pa_xfree(u);
+}