mpd/src/output/jack_plugin.c

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/* jack plug in for the Music Player Daemon (MPD)
* (c)2006 by anarch(anarchsss@gmail.com)
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "../output_api.h"
#include "../utils.h"
#include <assert.h>
#include <glib.h>
#include <jack/jack.h>
#include <jack/types.h>
#include <jack/ringbuffer.h>
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#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
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#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "jack"
static const size_t sample_size = sizeof(jack_default_audio_sample_t);
struct jack_data {
struct audio_output *ao;
/* configuration */
char *output_ports[2];
int ringbuffer_size;
/* for srate() only */
struct audio_format *audio_format;
/* jack library stuff */
jack_port_t *ports[2];
jack_client_t *client;
jack_ringbuffer_t *ringbuffer[2];
int bps;
int shutdown;
};
static const char *
mpd_jack_name(const struct jack_data *jd)
{
return audio_output_get_name(jd->ao);
}
static struct jack_data *
mpd_jack_new(void)
{
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struct jack_data *ret = g_new(struct jack_data, 1);
ret->ringbuffer_size = 32768;
return ret;
}
static void
mpd_jack_client_free(struct jack_data *jd)
{
assert(jd != NULL);
if (jd->client != NULL) {
jack_deactivate(jd->client);
jack_client_close(jd->client);
jd->client = NULL;
}
if (jd->ringbuffer[0] != NULL) {
jack_ringbuffer_free(jd->ringbuffer[0]);
jd->ringbuffer[0] = NULL;
}
if (jd->ringbuffer[1] != NULL) {
jack_ringbuffer_free(jd->ringbuffer[1]);
jd->ringbuffer[1] = NULL;
}
}
static void
mpd_jack_free(struct jack_data *jd)
{
assert(jd != NULL);
mpd_jack_client_free(jd);
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for (unsigned i = 0; i < G_N_ELEMENTS(jd->output_ports); ++i)
g_free(jd->output_ports[i]);
free(jd);
}
static void
mpd_jack_finish(void *data)
{
struct jack_data *jd = data;
mpd_jack_free(jd);
}
static int
mpd_jack_srate(G_GNUC_UNUSED jack_nframes_t rate, void *data)
{
struct jack_data *jd = (struct jack_data *)data;
struct audio_format *audioFormat = jd->audio_format;
audioFormat->sample_rate = (int)jack_get_sample_rate(jd->client);
return 0;
}
static int
mpd_jack_process(jack_nframes_t nframes, void *arg)
{
struct jack_data *jd = (struct jack_data *) arg;
jack_default_audio_sample_t *out;
size_t available;
if (nframes <= 0)
return 0;
for (unsigned i = 0; i < 2; ++i) {
available = jack_ringbuffer_read_space(jd->ringbuffer[i]);
assert(available % sample_size == 0);
available /= sample_size;
if (available > nframes)
available = nframes;
out = jack_port_get_buffer(jd->ports[i], nframes);
jack_ringbuffer_read(jd->ringbuffer[i],
(char *)out, available * sample_size);
while (available < nframes)
/* ringbuffer underrun, fill with silence */
out[available++] = 0.0;
}
return 0;
}
static void
mpd_jack_shutdown(void *arg)
{
struct jack_data *jd = (struct jack_data *) arg;
jd->shutdown = 1;
}
static void
set_audioformat(struct jack_data *jd, struct audio_format *audio_format)
{
audio_format->sample_rate = jack_get_sample_rate(jd->client);
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g_debug("samplerate = %u", audio_format->sample_rate);
audio_format->channels = 2;
if (audio_format->bits != 16 && audio_format->bits != 24)
audio_format->bits = 24;
jd->bps = audio_format->channels
* sizeof(jack_default_audio_sample_t)
* audio_format->sample_rate;
}
static void
mpd_jack_error(const char *msg)
{
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g_warning("%s", msg);
}
static void *
mpd_jack_init(struct audio_output *ao,
G_GNUC_UNUSED const struct audio_format *audio_format,
struct config_param *param)
{
struct jack_data *jd;
struct block_param *bp;
char *endptr;
int val;
jd = mpd_jack_new();
jd->ao = ao;
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g_debug("mpd_jack_init (pid=%d)", getpid());
if (param == NULL)
return jd;
if ( (bp = getBlockParam(param, "ports")) ) {
char **ports = g_strsplit(bp->value, ",", 0);
if (ports[0] == NULL || ports[1] == NULL || ports[2] != NULL)
g_error("two port names expected in line %d",
bp->line);
jd->output_ports[0] = ports[0];
jd->output_ports[1] = ports[1];
g_free(ports);
}
if ( (bp = getBlockParam(param, "ringbuffer_size")) ) {
errno = 0;
val = strtol(bp->value, &endptr, 10);
if ( errno == 0 && endptr != bp->value) {
jd->ringbuffer_size = val < 32768 ? 32768 : val;
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g_debug("ringbuffer_size=%d", jd->ringbuffer_size);
} else {
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g_error("%s is not a number; ringbuf_size=%d",
bp->value, jd->ringbuffer_size);
}
}
return jd;
}
static bool
mpd_jack_test_default_device(void)
{
return true;
}
static int
mpd_jack_connect(struct jack_data *jd, struct audio_format *audio_format)
{
const char **jports;
char *port_name;
jd->audio_format = audio_format;
if ((jd->client = jack_client_new(mpd_jack_name(jd))) == NULL) {
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g_warning("jack server not running?");
return -1;
}
jack_set_error_function(mpd_jack_error);
jack_set_process_callback(jd->client, mpd_jack_process, jd);
jack_set_sample_rate_callback(jd->client, mpd_jack_srate, jd);
jack_on_shutdown(jd->client, mpd_jack_shutdown, jd);
if ( jack_activate(jd->client) ) {
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g_warning("cannot activate client");
return -1;
}
jd->ports[0] = jack_port_register(jd->client, "left",
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsOutput, 0);
if ( !jd->ports[0] ) {
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g_warning("Cannot register left output port.");
return -1;
}
jd->ports[1] = jack_port_register(jd->client, "right",
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsOutput, 0);
if ( !jd->ports[1] ) {
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g_warning("Cannot register right output port.");
return -1;
}
/* hay que buscar que hay */
if (!jd->output_ports[1] &&
(jports = jack_get_ports(jd->client, NULL, NULL,
JackPortIsPhysical | JackPortIsInput))) {
jd->output_ports[0] = g_strdup(jports[0]);
jd->output_ports[1] = g_strdup(jports[1] != NULL
? jports[1] : jports[0]);
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g_debug("output_ports: %s %s",
jd->output_ports[0], jd->output_ports[1]);
free(jports);
}
if ( jd->output_ports[1] ) {
const char *name = mpd_jack_name(jd);
jd->ringbuffer[0] = jack_ringbuffer_create(jd->ringbuffer_size);
jd->ringbuffer[1] = jack_ringbuffer_create(jd->ringbuffer_size);
memset(jd->ringbuffer[0]->buf, 0, jd->ringbuffer[0]->size);
memset(jd->ringbuffer[1]->buf, 0, jd->ringbuffer[1]->size);
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port_name = g_malloc(sizeof(port_name[0]) * (7 + strlen(name)));
sprintf(port_name, "%s:left", name);
if ( (jack_connect(jd->client, port_name,
jd->output_ports[0])) != 0 ) {
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g_warning("%s is not a valid Jack Client / Port",
jd->output_ports[0]);
free(port_name);
return -1;
}
sprintf(port_name, "%s:right", name);
if ( (jack_connect(jd->client, port_name,
jd->output_ports[1])) != 0 ) {
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g_warning("%s is not a valid Jack Client / Port",
jd->output_ports[1]);
free(port_name);
return -1;
}
free(port_name);
}
return 1;
}
static bool
mpd_jack_open(void *data, struct audio_format *audio_format)
{
struct jack_data *jd = data;
assert(jd != NULL);
if (jd->client == NULL && mpd_jack_connect(jd, audio_format) < 0) {
mpd_jack_client_free(jd);
return false;
}
set_audioformat(jd, audio_format);
return true;
}
static void
mpd_jack_close(G_GNUC_UNUSED void *data)
{
/*mpd_jack_finish(audioOutput);*/
}
static void
mpd_jack_cancel (G_GNUC_UNUSED void *data)
{
}
static inline jack_default_audio_sample_t
sample_16_to_jack(int16_t sample)
{
return sample / (jack_default_audio_sample_t)(1 << (16 - 1));
}
static void
mpd_jack_write_samples_16(struct jack_data *jd, const int16_t *src,
unsigned num_samples)
{
jack_default_audio_sample_t sample;
while (num_samples-- > 0) {
sample = sample_16_to_jack(*src++);
jack_ringbuffer_write(jd->ringbuffer[0], (void*)&sample,
sizeof(sample));
sample = sample_16_to_jack(*src++);
jack_ringbuffer_write(jd->ringbuffer[1], (void*)&sample,
sizeof(sample));
}
}
static inline jack_default_audio_sample_t
sample_24_to_jack(int32_t sample)
{
return sample / (jack_default_audio_sample_t)(1 << (24 - 1));
}
static void
mpd_jack_write_samples_24(struct jack_data *jd, const int32_t *src,
unsigned num_samples)
{
jack_default_audio_sample_t sample;
while (num_samples-- > 0) {
sample = sample_24_to_jack(*src++);
jack_ringbuffer_write(jd->ringbuffer[0], (void*)&sample,
sizeof(sample));
sample = sample_24_to_jack(*src++);
jack_ringbuffer_write(jd->ringbuffer[1], (void*)&sample,
sizeof(sample));
}
}
static void
mpd_jack_write_samples(struct jack_data *jd, const void *src,
unsigned num_samples)
{
switch (jd->audio_format->bits) {
case 16:
mpd_jack_write_samples_16(jd, (const int16_t*)src,
num_samples);
break;
case 24:
mpd_jack_write_samples_24(jd, (const int32_t*)src,
num_samples);
break;
default:
assert(false);
}
}
static bool
mpd_jack_play(void *data, const char *buff, size_t size)
{
struct jack_data *jd = data;
const size_t frame_size = audio_format_frame_size(jd->audio_format);
size_t space, space1;
if (jd->shutdown) {
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g_warning("Refusing to play, because there is no client thread.");
mpd_jack_client_free(jd);
audio_output_closed(jd->ao);
return true;
}
assert(size % frame_size == 0);
size /= frame_size;
while (size > 0 && !jd->shutdown) {
space = jack_ringbuffer_write_space(jd->ringbuffer[0]);
space1 = jack_ringbuffer_write_space(jd->ringbuffer[1]);
if (space > space1)
/* send data symmetrically */
space = space1;
space /= sample_size;
if (space > 0) {
if (space > size)
space = size;
mpd_jack_write_samples(jd, buff, space);
buff += space * frame_size;
size -= space;
} else {
/* XXX do something more intelligent to
synchronize */
my_usleep(10000);
}
}
return true;
}
const struct audio_output_plugin jackPlugin = {
.name = "jack",
.test_default_device = mpd_jack_test_default_device,
.init = mpd_jack_init,
.finish = mpd_jack_finish,
.open = mpd_jack_open,
.play = mpd_jack_play,
.cancel = mpd_jack_cancel,
.close = mpd_jack_close,
};