#include <errno.h>
#include <stdio.h>
#include <math.h>
#include <sys/mman.h>
#define M_PI_M2 ( M_PI + M_PI )
#define BUFFER_SAMPLES 128
struct buffer {
uint32_t id;
void *ptr;
bool mapped;
};
struct data {
const char *path;
uint64_t info_all;
struct spa_io_control *io_notify;
uint32_t io_notify_size;
struct buffer buffers[32];
uint32_t n_buffers;
double accumulator;
double volume_accum;
};
static void update_volume(struct data *data)
{
if (data->io_notify == NULL)
return;
data->volume_accum += M_PI_M2 / 1000.0;
if (data->volume_accum >= M_PI_M2)
data->volume_accum -= M_PI_M2;
}
static int impl_send_command(
void *
object,
const struct spa_command *command)
{
return 0;
}
static int impl_add_listener(void *object,
void *data)
{
struct data *d = object;
uint64_t old;
old = d->info.change_mask;
d->info.change_mask = d->info_all;
d->info.change_mask = old;
return 0;
}
static int impl_set_callbacks(void *object,
{
return 0;
}
static int impl_set_io(void *object,
uint32_t id, void *data, size_t size)
{
return 0;
}
static int impl_port_set_io(
void *
object,
enum spa_direction direction, uint32_t port_id,
uint32_t id, void *data, size_t size)
{
struct data *d = object;
switch (id) {
d->io = data;
break;
d->io_notify = data;
d->io_notify_size = size;
break;
default:
return -ENOENT;
}
return 0;
}
static int impl_port_enum_params(void *object, int seq,
uint32_t id, uint32_t start, uint32_t num,
{
struct data *d = object;
uint8_t buffer[1024];
uint32_t count = 0;
result.next = start;
result.index = result.next++;
switch (id) {
if (result.index != 0)
return 0;
break;
if (result.index != 0)
return 0;
if (d->format.format == 0)
return 0;
break;
if (result.index > 0)
return 0;
BUFFER_SAMPLES * sizeof(float), 32, INT32_MAX),
break;
switch (result.index) {
case 0:
break;
default:
return 0;
}
break;
switch (result.index) {
case 0:
break;
case 1:
break;
default:
return 0;
}
break;
default:
return -ENOENT;
}
if (++count != num)
return 0;
}
static int port_set_format(void *object,
uint32_t flags,
const struct spa_pod *format)
{
struct data *d = object;
if (format == NULL) {
d->format.format = 0;
return 0;
}
return -EINVAL;
return -EINVAL;
return 0;
}
static int impl_port_set_param(void *object,
uint32_t id, uint32_t flags,
{
return port_set_format(object, direction, port_id, flags, param);
}
else
return -ENOENT;
}
static int impl_port_use_buffers(void *object,
uint32_t flags,
{
struct data *d = object;
uint32_t i;
for (i = 0; i < n_buffers; i++) {
struct buffer *b = &d->buffers[i];
if (datas[0].
data != NULL) {
b->mapped = false;
}
MAP_SHARED, datas[0].
fd, 0);
if (b->ptr == MAP_FAILED) {
return -errno;
}
b->ptr =
SPA_PTROFF(b->ptr, datas[0].mapoffset,
void);
b->mapped = true;
}
else {
return -EINVAL;
}
b->id = i;
b->buffer = buffers[i];
}
d->n_buffers = n_buffers;
return 0;
}
static inline void reuse_buffer(
struct data *d, uint32_t
id)
{
}
static int impl_port_reuse_buffer(void *object, uint32_t port_id, uint32_t buffer_id)
{
struct data *d = object;
reuse_buffer(d, buffer_id);
return 0;
}
static void fill_f32(struct data *d, void *dest, int avail)
{
float *dst = dest;
int n_samples = avail / (sizeof(float) * d->format.channels);
int i;
uint32_t c;
for (i = 0; i < n_samples; i++) {
float val;
d->accumulator += M_PI_M2 * 440 / d->format.rate;
if (d->accumulator >= M_PI_M2)
d->accumulator -= M_PI_M2;
val = sin(d->accumulator);
for (c = 0; c < d->format.channels; c++)
*dst++ = val;
}
}
static void fill_s16(struct data *d, void *dest, int avail)
{
int16_t *dst = dest;
int n_samples = avail / (sizeof(int16_t) * d->format.channels);
int i;
uint32_t c;
for (i = 0; i < n_samples; i++) {
int16_t val;
d->accumulator += M_PI_M2 * 440 / d->format.rate;
if (d->accumulator >= M_PI_M2)
d->accumulator -= M_PI_M2;
val = (int16_t) (sin(d->accumulator) * 32767.0);
for (c = 0; c < d->format.channels; c++)
*dst++ = val;
}
}
static int impl_node_process(void *object)
{
struct data *d = object;
struct buffer *b;
int avail;
uint32_t maxsize, index = 0;
uint32_t filled, offset;
}
return -EPIPE;
}
od = b->buffer->datas;
filled = 0;
index = 0;
fill_s16(d,
SPA_PTROFF(b->ptr, offset,
void), avail);
fill_f32(d,
SPA_PTROFF(b->ptr, offset,
void), avail);
update_volume(d);
}
.add_listener = impl_add_listener,
.set_callbacks = impl_set_callbacks,
.set_io = impl_set_io,
.send_command = impl_send_command,
.port_set_io = impl_port_set_io,
.port_enum_params = impl_port_enum_params,
.port_set_param = impl_port_set_param,
.port_use_buffers = impl_port_use_buffers,
.port_reuse_buffer = impl_port_reuse_buffer,
.process = impl_node_process,
};
static void make_node(struct data *data)
{
NULL);
if (data->path)
&impl_node, data);
&props->
dict, &data->impl_node, 0);
}
static void on_core_error(void *data, uint32_t id, int seq, int res, const char *message)
{
struct data *d = data;
}
.error = on_core_error,
};
int main(int argc, char *argv[])
{
struct data data = { 0, };
data.path = argc > 1 ? argv[1] : NULL;
data.info.flags = 0;
data.info.props = &data.dict;
data.info.params = data.params;
data.info.n_params = 5;
printf("can't connect: %m\n");
return -1;
}
make_node(&data);
return 0;
}