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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 <sys/mman.h>
#include "iochannel.h"
#include "sink.h"
#include "source.h"
#include "module.h"
#include "oss-util.h"
#include "sample-util.h"
struct userdata {
struct sink *sink;
struct source *source;
struct core *core;
struct pa_sample_spec sample_spec;
size_t in_fragment_size, out_fragment_size, in_fragments, out_fragments, out_fill;
int fd;
void *in_mmap, *out_mmap;
size_t in_mmap_length, out_mmap_length;
struct mainloop_source *mainloop_source;
struct memblock **in_memblocks, **out_memblocks;
unsigned out_current, in_current;
};
void module_done(struct core *c, struct module*m);
static void out_clear_memblocks(struct userdata*u, unsigned n) {
unsigned i = u->out_current;
assert(u && u->out_memblocks);
if (n > u->out_fragments)
n = u->out_fragments;
while (n > 0) {
if (u->out_memblocks[i]) {
memblock_unref_fixed(u->out_memblocks[i]);
u->out_memblocks[i] = NULL;
}
i++;
while (i >= u->out_fragments)
i -= u->out_fragments;
n--;
}
}
static void out_fill_memblocks(struct userdata *u, unsigned n) {
assert(u && u->out_memblocks);
while (n > 0) {
struct memchunk chunk;
if (!u->out_memblocks[u->out_current]) {
u->out_memblocks[u->out_current] = chunk.memblock = memblock_new_fixed(u->out_mmap+u->out_fragment_size*u->out_current, u->out_fragment_size);
chunk.length = chunk.memblock->length;
chunk.index = 0;
sink_render_into_full(u->sink, &chunk);
}
u->out_current++;
while (u->out_current >= u->out_fragments)
u->out_current -= u->out_fragments;
n--;
}
}
static void do_write(struct userdata *u) {
struct count_info info;
assert(u && u->sink);
if (ioctl(u->fd, SNDCTL_DSP_GETOPTR, &info) < 0) {
fprintf(stderr, "SNDCTL_DSP_GETOPTR: %s\n", strerror(errno));
return;
}
u->out_fill = (u->out_fragment_size * u->out_fragments) - (info.ptr % u->out_fragment_size);
if (!info.blocks)
return;
out_clear_memblocks(u, info.blocks);
out_fill_memblocks(u, info.blocks);
}
static void in_post_memblocks(struct userdata *u, unsigned n) {
assert(u && u->in_memblocks);
while (n > 0) {
struct memchunk chunk;
if (!u->in_memblocks[u->in_current]) {
u->in_memblocks[u->in_current] = chunk.memblock = memblock_new_fixed(u->in_mmap+u->in_fragment_size*u->in_current, u->in_fragment_size);
chunk.length = chunk.memblock->length;
chunk.index = 0;
source_post(u->source, &chunk);
}
u->in_current++;
while (u->in_current >= u->in_fragments)
u->in_current -= u->in_fragments;
n--;
}
}
static void in_clear_memblocks(struct userdata*u, unsigned n) {
unsigned i = u->in_current;
assert(u && u->in_memblocks);
if (n > u->in_fragments)
n = u->in_fragments;
while (n > 0) {
if (u->in_memblocks[i]) {
memblock_unref_fixed(u->in_memblocks[i]);
u->in_memblocks[i] = NULL;
}
i++;
while (i >= u->in_fragments)
i -= u->in_fragments;
n--;
}
}
static void do_read(struct userdata *u) {
struct count_info info;
assert(u && u->source);
if (ioctl(u->fd, SNDCTL_DSP_GETIPTR, &info) < 0) {
fprintf(stderr, "SNDCTL_DSP_GETIPTR: %s\n", strerror(errno));
return;
}
if (!info.blocks)
return;
in_post_memblocks(u, info.blocks);
in_clear_memblocks(u, u->in_fragments/2);
};
static void io_callback(struct pa_mainloop_api *m, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata) {
struct userdata *u = userdata;
assert (u && u->core->mainloop == m && u->mainloop_source == id);
if (events & PA_MAINLOOP_API_IO_EVENT_INPUT)
do_read(u);
if (events & PA_MAINLOOP_API_IO_EVENT_OUTPUT)
do_write(u);
}
static uint32_t sink_get_latency_cb(struct sink *s) {
struct userdata *u = s->userdata;
assert(s && u);
do_write(u);
return pa_samples_usec(u->out_fill, &s->sample_spec);
}
int module_init(struct core *c, struct module*m) {
struct audio_buf_info info;
struct userdata *u = NULL;
char *p;
int frag_size;
int mode, caps, caps_read = 0;
int enable_bits = 0, zero = 0;
assert(c && m);
m->userdata = u = malloc(sizeof(struct userdata));
assert(u);
memset(u, 0, sizeof(struct userdata));
u->fd = -1;
u->core = c;
p = m->argument ? m->argument : "/dev/dsp";
if ((u->fd = open(p, (mode = O_RDWR)|O_NDELAY)) >= 0) {
ioctl(u->fd, SNDCTL_DSP_SETDUPLEX, 0);
if (ioctl(u->fd, SNDCTL_DSP_GETCAPS, &caps) < 0) {
fprintf(stderr, "SNDCTL_DSP_GETCAPS: %s\n", strerror(errno));
goto fail;
}
if (!(caps & DSP_CAP_DUPLEX)) {
close(u->fd);
u->fd = -1;
} else
caps_read = 1;
}
if (u->fd < 0) {
if ((u->fd = open(p, (mode = O_WRONLY)|O_NDELAY)) < 0) {
if ((u->fd = open(p, (mode = O_RDONLY)|O_NDELAY)) < 0) {
fprintf(stderr, "open('%s'): %s\n", p, strerror(errno));
goto fail;
}
}
}
if (!caps_read) {
if (ioctl(u->fd, SNDCTL_DSP_GETCAPS, &caps) < 0) {
fprintf(stderr, "SNDCTL_DSP_GETCAPS: %s\n", strerror(errno));
goto fail;
}
}
if (!(caps & DSP_CAP_MMAP) || !(caps & DSP_CAP_REALTIME) || !(caps & DSP_CAP_TRIGGER)) {
fprintf(stderr, "OSS device not mmap capable.\n");
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(u->fd, SNDCTL_DSP_SETFRAGMENT, &frag_size) < 0) {
fprintf(stderr, "SNDCTL_DSP_SETFRAGMENT: %s\n", strerror(errno));
goto fail;
}
if (oss_auto_format(u->fd, &u->sample_spec) < 0)
goto fail;
if (mode != O_WRONLY) {
if (ioctl(u->fd, SNDCTL_DSP_GETISPACE, &info) < 0) {
fprintf(stderr, "SNDCTL_DSP_GETISPACE: %s\n", strerror(errno));
goto fail;
}
fprintf(stderr, "module-oss-mmap: input -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
u->in_mmap_length = (u->in_fragment_size = info.fragsize) * (u->in_fragments = info.fragstotal);
if ((u->in_mmap = mmap(NULL, u->in_mmap_length, PROT_READ, MAP_SHARED, u->fd, 0)) == MAP_FAILED) {
if (mode == O_RDWR) {
fprintf(stderr, "module-oss-mmap: mmap failed for input. Changing to O_WRONLY mode.\n");
mode = O_WRONLY;
} else {
fprintf(stderr, "modeule-oss-mmap: mmap(): %s\n", strerror(errno));
goto fail;
}
} else {
u->source = source_new(c, "dsp", 0, &u->sample_spec);
assert(u->source);
u->source->userdata = u;
u->in_memblocks = malloc(sizeof(struct memblock *)*u->in_fragments);
memset(u->in_memblocks, 0, sizeof(struct memblock *)*u->in_fragments);
enable_bits |= PCM_ENABLE_INPUT;
}
}
if (m != O_RDONLY) {
if (ioctl(u->fd, SNDCTL_DSP_GETOSPACE, &info) < 0) {
fprintf(stderr, "SNDCTL_DSP_GETOSPACE: %s\n", strerror(errno));
goto fail;
}
fprintf(stderr, "module-oss: output -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
u->out_mmap_length = (u->out_fragment_size = info.fragsize) * (u->out_fragments = info.fragstotal);
if ((u->out_mmap = mmap(NULL, u->out_mmap_length, PROT_WRITE, MAP_SHARED, u->fd, 0)) == MAP_FAILED) {
if (mode == O_RDWR) {
fprintf(stderr, "module-oss-mmap: mmap filed for output. Changing to O_RDONLY mode.\n");
mode = O_RDONLY;
} else {
fprintf(stderr, "modeule-oss-mmap: mmap(): %s\n", strerror(errno));
goto fail;
}
} else {
silence_memory(u->out_mmap, u->out_mmap_length, &u->sample_spec);
u->sink = sink_new(c, "dsp", 0, &u->sample_spec);
assert(u->sink);
u->sink->get_latency = sink_get_latency_cb;
u->sink->userdata = u;
u->out_memblocks = malloc(sizeof(struct memblock *)*u->out_fragments);
memset(u->out_memblocks, 0, sizeof(struct memblock *)*u->out_fragments);
enable_bits |= PCM_ENABLE_OUTPUT;
}
}
zero = 0;
if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &zero) < 0) {
fprintf(stderr, "SNDCTL_DSP_SETTRIGGER: %s\n", strerror(errno));
goto fail;
}
if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &enable_bits) < 0) {
fprintf(stderr, "SNDCTL_DSP_SETTRIGGER: %s\n", strerror(errno));
goto fail;
}
assert(u->source || u->sink);
u->mainloop_source = c->mainloop->source_io(c->mainloop, u->fd, (u->source ? PA_MAINLOOP_API_IO_EVENT_INPUT : 0) | (u->sink ? PA_MAINLOOP_API_IO_EVENT_OUTPUT : 0), io_callback, u);
assert(u->mainloop_source);
return 0;
fail:
module_done(c, m);
return -1;
}
void module_done(struct core *c, struct module*m) {
struct userdata *u;
assert(c && m);
u = m->userdata;
assert(u);
if (u->out_memblocks) {
out_clear_memblocks(u, u->out_fragments);
free(u->out_memblocks);
}
if (u->in_memblocks) {
in_clear_memblocks(u, u->in_fragments);
free(u->in_memblocks);
}
if (u->in_mmap && u->in_mmap != MAP_FAILED)
munmap(u->in_mmap, u->in_mmap_length);
if (u->out_mmap && u->out_mmap != MAP_FAILED)
munmap(u->out_mmap, u->out_mmap_length);
if (u->sink)
sink_free(u->sink);
if (u->source)
source_free(u->source);
if (u->mainloop_source)
u->core->mainloop->cancel_io(u->core->mainloop, u->mainloop_source);
if (u->fd >= 0)
close(u->fd);
free(u);
}
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