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#include <sys/soundcard.h>
#include <sys/ioctl.h>
#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 "source.h"
#include "module.h"
#include "oss-util.h"
#include "sample-util.h"
struct userdata {
struct pa_sink *sink;
struct pa_source *source;
struct pa_iochannel *io;
struct pa_core *core;
struct pa_memchunk memchunk, silence;
uint32_t in_fragment_size, out_fragment_size, sample_size;
int fd;
};
static void do_write(struct userdata *u) {
struct pa_memchunk *memchunk;
ssize_t r;
assert(u);
if (!u->sink || !pa_iochannel_is_writable(u->io))
return;
if (!u->memchunk.length) {
if (pa_sink_render(u->sink, u->out_fragment_size, &u->memchunk) < 0)
memchunk = &u->silence;
else
memchunk = &u->memchunk;
}
assert(memchunk->memblock && memchunk->length);
if ((r = pa_iochannel_write(u->io, memchunk->memblock->data + memchunk->index, memchunk->length)) < 0) {
fprintf(stderr, "write() failed: %s\n", strerror(errno));
return;
}
if (memchunk == &u->silence)
assert(r % u->sample_size == 0);
else {
u->memchunk.index += r;
u->memchunk.length -= r;
if (u->memchunk.length <= 0) {
pa_memblock_unref(u->memchunk.memblock);
u->memchunk.memblock = NULL;
}
}
}
static void do_read(struct userdata *u) {
struct pa_memchunk memchunk;
ssize_t r;
assert(u);
if (!u->source || !pa_iochannel_is_readable(u->io))
return;
memchunk.memblock = pa_memblock_new(u->in_fragment_size);
assert(memchunk.memblock);
if ((r = pa_iochannel_read(u->io, memchunk.memblock->data, memchunk.memblock->length)) < 0) {
pa_memblock_unref(memchunk.memblock);
if (errno != EAGAIN)
fprintf(stderr, "read() failed: %s\n", strerror(errno));
return;
}
assert(r <= (ssize_t) memchunk.memblock->length);
memchunk.length = memchunk.memblock->length = r;
memchunk.index = 0;
pa_source_post(u->source, &memchunk);
pa_memblock_unref(memchunk.memblock);
};
static void io_callback(struct pa_iochannel *io, void*userdata) {
struct userdata *u = userdata;
assert(u);
do_write(u);
do_read(u);
}
static uint32_t sink_get_latency_cb(struct pa_sink *s) {
int arg;
struct userdata *u = s->userdata;
assert(s && u && u->sink);
if (ioctl(u->fd, SNDCTL_DSP_GETODELAY, &arg) < 0) {
fprintf(stderr, "module-oss: device doesn't support SNDCTL_DSP_GETODELAY.\n");
s->get_latency = NULL;
return 0;
}
return pa_samples_usec(arg, &s->sample_spec);
}
int pa_module_init(struct pa_core *c, struct pa_module*m) {
struct audio_buf_info info;
struct userdata *u = NULL;
char *p;
int fd = -1;
int frag_size, in_frag_size, out_frag_size;
int mode;
struct pa_sample_spec ss;
assert(c && m);
p = m->argument ? m->argument : "/dev/dsp";
if ((fd = open(p, (mode = O_RDWR)|O_NDELAY)) >= 0) {
int caps;
ioctl(fd, SNDCTL_DSP_SETDUPLEX, 0);
if (ioctl(fd, SNDCTL_DSP_GETCAPS, &caps) < 0) {
fprintf(stderr, "SNDCTL_DSP_GETCAPS: %s\n", strerror(errno));
goto fail;
}
if (!(caps & DSP_CAP_DUPLEX)) {
close(fd);
fd = -1;
}
}
if (fd < 0) {
if ((fd = open(p, (mode = O_WRONLY)|O_NDELAY)) < 0) {
if ((fd = open(p, (mode = O_RDONLY)|O_NDELAY)) < 0) {
fprintf(stderr, "open('%s'): %s\n", p, strerror(errno));
goto fail;
}
}
}
fprintf(stderr, "module-oss: device opened in %s mode.\n", mode == O_WRONLY ? "O_WRONLY" : (mode == O_RDONLY ? "O_RDONLY" : "O_RDWR"));
frag_size = ((int) 12 << 16) | 10; /* nfrags = 12; frag_size = 2^10 */
if (ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &frag_size) < 0) {
fprintf(stderr, "SNDCTL_DSP_SETFRAGMENT: %s\n", strerror(errno));
goto fail;
}
if (pa_oss_auto_format(fd, &ss) < 0)
goto fail;
if (ioctl(fd, SNDCTL_DSP_GETBLKSIZE, &frag_size) < 0) {
fprintf(stderr, "SNDCTL_DSP_GETBLKSIZE: %s\n", strerror(errno));
goto fail;
}
assert(frag_size);
in_frag_size = out_frag_size = frag_size;
if (ioctl(fd, SNDCTL_DSP_GETISPACE, &info) >= 0) {
fprintf(stderr, "module-oss: input -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
in_frag_size = info.fragsize;
}
if (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) >= 0) {
fprintf(stderr, "module-oss: output -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
out_frag_size = info.fragsize;
}
u = malloc(sizeof(struct userdata));
assert(u);
u->core = c;
if (mode != O_RDONLY) {
u->sink = pa_sink_new(c, "dsp", 0, &ss);
assert(u->sink);
u->sink->get_latency = sink_get_latency_cb;
u->sink->userdata = u;
} else
u->sink = NULL;
if (mode != O_WRONLY) {
u->source = pa_source_new(c, "dsp", 0, &ss);
assert(u->source);
u->source->userdata = u;
} else
u->source = NULL;
assert(u->source || u->sink);
u->io = pa_iochannel_new(c->mainloop, u->source ? fd : -1, u->sink ? fd : 0);
assert(u->io);
pa_iochannel_set_callback(u->io, io_callback, u);
u->fd = fd;
u->memchunk.memblock = NULL;
u->memchunk.length = 0;
u->sample_size = pa_sample_size(&ss);
u->out_fragment_size = out_frag_size;
u->in_fragment_size = in_frag_size;
u->silence.memblock = pa_memblock_new(u->silence.length = u->out_fragment_size);
assert(u->silence.memblock);
pa_silence_memblock(u->silence.memblock, &ss);
u->silence.index = 0;
m->userdata = u;
return 0;
fail:
if (fd >= 0)
close(fd);
return -1;
}
void pa_module_done(struct pa_core *c, struct pa_module*m) {
struct userdata *u;
assert(c && m);
u = m->userdata;
assert(u);
if (u->memchunk.memblock)
pa_memblock_unref(u->memchunk.memblock);
if (u->silence.memblock)
pa_memblock_unref(u->silence.memblock);
if (u->sink)
pa_sink_free(u->sink);
if (u->source)
pa_source_free(u->source);
pa_iochannel_free(u->io);
free(u);
}
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