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#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 "sink.h"
#include "module.h"
struct userdata {
char *filename;
struct sink *sink;
struct iochannel *io;
struct core *core;
struct mainloop_source *mainloop_source;
struct memchunk memchunk;
};
static void do_write(struct userdata *u) {
ssize_t r;
assert(u);
mainloop_source_enable(u->mainloop_source, 0);
if (!iochannel_is_writable(u->io))
return;
if (!u->memchunk.length)
if (sink_render(u->sink, PIPE_BUF, &u->memchunk) < 0)
return;
assert(u->memchunk.memblock && u->memchunk.length);
if ((r = iochannel_write(u->io, u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length)) < 0) {
fprintf(stderr, "write() failed: %s\n", strerror(errno));
return;
}
u->memchunk.index += r;
u->memchunk.length -= r;
if (u->memchunk.length <= 0) {
memblock_unref(u->memchunk.memblock);
u->memchunk.memblock = NULL;
}
}
static void notify_callback(struct sink*s, void *userdata) {
struct userdata *u = userdata;
assert(u);
if (iochannel_is_writable(u->io))
mainloop_source_enable(u->mainloop_source, 1);
}
static void prepare_callback(struct mainloop_source *src, void *userdata) {
struct userdata *u = userdata;
assert(u);
do_write(u);
}
static void io_callback(struct iochannel *io, void*userdata) {
struct userdata *u = userdata;
assert(u);
do_write(u);
}
int module_init(struct core *c, struct module*m) {
struct userdata *u = NULL;
struct stat st;
char *p;
int fd = -1;
const static struct sample_spec ss = {
.format = SAMPLE_S16NE,
.rate = 44100,
.channels = 2,
};
assert(c && m);
mkfifo((p = m->argument ? m->argument : "/tmp/musicfifo"), 0777);
if ((fd = open(p, O_RDWR)) < 0) {
fprintf(stderr, "open('%s'): %s\n", p, strerror(errno));
goto fail;
}
if (fstat(fd, &st) < 0) {
fprintf(stderr, "fstat('%s'): %s\n", p, strerror(errno));
goto fail;
}
if (!S_ISFIFO(st.st_mode)) {
fprintf(stderr, "'%s' is not a FIFO\n", p);
goto fail;
}
u = malloc(sizeof(struct userdata));
assert(u);
u->filename = strdup(p);
assert(u->filename);
u->core = c;
u->sink = sink_new(c, "fifo", &ss);
assert(u->sink);
sink_set_notify_callback(u->sink, notify_callback, u);
u->io = iochannel_new(c->mainloop, -1, fd);
assert(u->io);
iochannel_set_callback(u->io, io_callback, u);
u->memchunk.memblock = NULL;
u->memchunk.length = 0;
u->mainloop_source = mainloop_source_new_fixed(c->mainloop, prepare_callback, u);
assert(u->mainloop_source);
mainloop_source_enable(u->mainloop_source, 0);
m->userdata = u;
return 0;
fail:
if (fd >= 0)
close(fd);
return -1;
}
void module_done(struct core *c, struct module*m) {
struct userdata *u;
assert(c && m);
u = m->userdata;
assert(u);
if (u->memchunk.memblock)
memblock_unref(u->memchunk.memblock);
sink_free(u->sink);
iochannel_free(u->io);
mainloop_source_free(u->mainloop_source);
assert(u->filename);
unlink(u->filename);
free(u->filename);
free(u);
}
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