mpd/src/audioOutputs/audioOutput_jack.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"
#ifdef HAVE_JACK
#include "../utils.h"
#include "../log.h"
#include <assert.h>
#include <jack/jack.h>
#include <jack/types.h>
#include <jack/ringbuffer.h>
static const size_t sample_size = sizeof(jack_default_audio_sample_t);
typedef struct _JackData {
struct audio_output *ao;
/* configuration */
const char *name;
const char *output_ports[2];
int ringbuf_sz;
/* for srate() only */
struct audio_format *audio_format;
/* locks */
pthread_mutex_t play_audio_lock;
pthread_cond_t play_audio;
/* jack library stuff */
jack_port_t *ports[2];
jack_client_t *client;
jack_ringbuffer_t *ringbuffer[2];
int bps;
int shutdown;
} JackData;
/*JackData *jd = NULL;*/
static JackData *newJackData(void)
{
JackData *ret;
ret = xcalloc(sizeof(JackData), 1);
ret->name = "mpd";
ret->ringbuf_sz = 32768;
pthread_mutex_init(&ret->play_audio_lock, NULL);
pthread_cond_init(&ret->play_audio, NULL);
return ret;
}
static void freeJackClient(JackData *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;
}
pthread_mutex_destroy(&jd->play_audio_lock);
pthread_cond_destroy(&jd->play_audio);
}
static void freeJackData(JackData *jd)
{
int i;
assert(jd != NULL);
freeJackClient(jd);
if (strcmp(jd->name, "mpd") != 0)
xfree(jd->name);
for ( i = ARRAY_SIZE(jd->output_ports); --i >= 0; ) {
if (!jd->output_ports[i])
continue;
xfree(jd->output_ports[i]);
}
free(jd);
}
static void jack_finishDriver(void *data)
{
JackData *jd = data;
freeJackData(jd);
DEBUG("disconnect_jack (pid=%d)\n", getpid ());
}
static int srate(mpd_unused jack_nframes_t rate, void *data)
{
JackData *jd = (JackData *)data;
struct audio_format *audioFormat = jd->audio_format;
audioFormat->sample_rate = (int)jack_get_sample_rate(jd->client);
return 0;
}
static int process(jack_nframes_t nframes, void *arg)
{
size_t i;
JackData *jd = (JackData *) arg;
jack_default_audio_sample_t *out[2];
size_t avail_data, avail_frames;
if ( nframes <= 0 )
return 0;
out[0] = jack_port_get_buffer(jd->ports[0], nframes);
out[1] = jack_port_get_buffer(jd->ports[1], nframes);
while ( nframes ) {
avail_data = jack_ringbuffer_read_space(jd->ringbuffer[1]);
if ( avail_data > 0 ) {
avail_frames = avail_data / sample_size;
if (avail_frames > nframes) {
avail_frames = nframes;
avail_data = nframes*sample_size;
}
jack_ringbuffer_read(jd->ringbuffer[0], (char *)out[0],
avail_data);
jack_ringbuffer_read(jd->ringbuffer[1], (char *)out[1],
avail_data);
nframes -= avail_frames;
out[0] += avail_data;
out[1] += avail_data;
} else {
for (i = 0; i < nframes; i++)
out[0][i] = out[1][i] = 0.0;
nframes = 0;
}
if (pthread_mutex_trylock (&jd->play_audio_lock) == 0) {
pthread_cond_signal (&jd->play_audio);
pthread_mutex_unlock (&jd->play_audio_lock);
}
}
/*DEBUG("process (pid=%d)\n", getpid());*/
return 0;
}
static void shutdown_callback(void *arg)
{
JackData *jd = (JackData *) arg;
jd->shutdown = 1;
}
static void set_audioformat(JackData *jd, struct audio_format *audioFormat)
{
audioFormat->sample_rate = jack_get_sample_rate(jd->client);
DEBUG("samplerate = %u\n", audioFormat->sample_rate);
audioFormat->channels = 2;
audioFormat->bits = 16;
jd->bps = audioFormat->channels
* sizeof(jack_default_audio_sample_t)
* audioFormat->sample_rate;
}
static void error_callback(const char *msg)
{
ERROR("jack: %s\n", msg);
}
static void *jack_initDriver(struct audio_output *ao,
mpd_unused const struct audio_format *audio_format,
ConfigParam *param)
{
JackData *jd;
BlockParam *bp;
char *endptr;
int val;
char *cp = NULL;
jd = newJackData();
jd->ao = ao;
DEBUG("jack_initDriver (pid=%d)\n", getpid());
if (param == NULL)
return jd;
if ( (bp = getBlockParam(param, "ports")) ) {
DEBUG("output_ports=%s\n", bp->value);
if (!(cp = strchr(bp->value, ',')))
FATAL("expected comma and a second value for '%s' "
"at line %d: %s\n",
bp->name, bp->line, bp->value);
*cp = '\0';
jd->output_ports[0] = xstrdup(bp->value);
*cp++ = ',';
if (!*cp)
FATAL("expected a second value for '%s' at line %d: "
"%s\n", bp->name, bp->line, bp->value);
jd->output_ports[1] = xstrdup(cp);
if (strchr(cp,','))
FATAL("Only %d values are supported for '%s' "
"at line %d\n",
(int)ARRAY_SIZE(jd->output_ports),
bp->name, bp->line);
}
if ( (bp = getBlockParam(param, "ringbuffer_size")) ) {
errno = 0;
val = strtol(bp->value, &endptr, 10);
if ( errno == 0 && endptr != bp->value) {
jd->ringbuf_sz = val < 32768 ? 32768 : val;
DEBUG("ringbuffer_size=%d\n", jd->ringbuf_sz);
} else {
FATAL("%s is not a number; ringbuf_size=%d\n",
bp->value, jd->ringbuf_sz);
}
}
if ( (bp = getBlockParam(param, "name"))
&& (strcmp(bp->value, "mpd") != 0) ) {
jd->name = xstrdup(bp->value);
DEBUG("name=%s\n", jd->name);
}
return jd;
}
static int jack_testDefault(void)
{
return 0;
}
static int connect_jack(JackData *jd, struct audio_format *audio_format)
{
const char **jports;
char *port_name;
jd->audio_format = audio_format;
if ( (jd->client = jack_client_new(jd->name)) == NULL ) {
ERROR("jack server not running?\n");
return -1;
}
jack_set_error_function(error_callback);
jack_set_process_callback(jd->client, process, (void *)jd);
jack_set_sample_rate_callback(jd->client, (JackProcessCallback)srate,
(void *)jd);
jack_on_shutdown(jd->client, shutdown_callback, (void *)jd);
if ( jack_activate(jd->client) ) {
ERROR("cannot activate client\n");
return -1;
}
jd->ports[0] = jack_port_register(jd->client, "left",
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsOutput, 0);
if ( !jd->ports[0] ) {
ERROR("Cannot register left output port.\n");
return -1;
}
jd->ports[1] = jack_port_register(jd->client, "right",
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsOutput, 0);
if ( !jd->ports[1] ) {
ERROR("Cannot register right output port.\n");
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] = jports[0];
jd->output_ports[1] = jports[1] ? jports[1] : jports[0];
DEBUG("output_ports: %s %s\n",
jd->output_ports[0], jd->output_ports[1]);
free(jports);
}
if ( jd->output_ports[1] ) {
jd->ringbuffer[0] = jack_ringbuffer_create(jd->ringbuf_sz);
jd->ringbuffer[1] = jack_ringbuffer_create(jd->ringbuf_sz);
memset(jd->ringbuffer[0]->buf, 0, jd->ringbuffer[0]->size);
memset(jd->ringbuffer[1]->buf, 0, jd->ringbuffer[1]->size);
port_name = xmalloc(sizeof(char)*(7+strlen(jd->name)));
sprintf(port_name, "%s:left", jd->name);
if ( (jack_connect(jd->client, port_name,
jd->output_ports[0])) != 0 ) {
ERROR("%s is not a valid Jack Client / Port\n",
jd->output_ports[0]);
free(port_name);
return -1;
}
sprintf(port_name, "%s:right", jd->name);
if ( (jack_connect(jd->client, port_name,
jd->output_ports[1])) != 0 ) {
ERROR("%s is not a valid Jack Client / Port\n",
jd->output_ports[1]);
free(port_name);
return -1;
}
free(port_name);
}
DEBUG("connect_jack (pid=%d)\n", getpid());
return 1;
}
static int jack_openDevice(void *data,
struct audio_format *audio_format)
{
JackData *jd = data;
assert(jd != NULL);
if (jd->client == NULL && connect_jack(jd, audio_format) < 0) {
freeJackClient(jd);
return -1;
}
set_audioformat(jd, audio_format);
DEBUG("jack_openDevice (pid=%d)!\n", getpid ());
return 0;
}
static void jack_closeDevice(mpd_unused void *data)
{
/*jack_finishDriver(audioOutput);*/
DEBUG("jack_closeDevice (pid=%d)\n", getpid());
}
static void jack_dropBufferedAudio (mpd_unused void *data)
{
}
static int jack_playAudio(void *data,
const char *buff, size_t size)
{
JackData *jd = data;
size_t space;
size_t i;
const short *buffer = (const short *) buff;
jack_default_audio_sample_t sample;
size_t samples = size/4;
/*DEBUG("jack_playAudio: (pid=%d)!\n", getpid());*/
if ( jd->shutdown ) {
ERROR("Refusing to play, because there is no client thread.\n");
freeJackClient(jd);
audio_output_closed(jd->ao);
return 0;
}
while ( samples && !jd->shutdown ) {
if ( (space = jack_ringbuffer_write_space(jd->ringbuffer[0]))
>= samples*sample_size ) {
/*space = MIN(space, samples*sample_size);*/
/*space = samples*sample_size;*/
/*for(i=0; i<space/sample_size; i++) {*/
for(i=0; i<samples; i++) {
sample = (jack_default_audio_sample_t) *(buffer++)/32768.0;
jack_ringbuffer_write(jd->ringbuffer[0], (void*)&sample,
sample_size);
sample = (jack_default_audio_sample_t) *(buffer++)/32768.0;
jack_ringbuffer_write(jd->ringbuffer[1], (void*)&sample,
sample_size);
/*samples--;*/
}
samples=0;
} else {
pthread_mutex_lock(&jd->play_audio_lock);
pthread_cond_wait(&jd->play_audio,
&jd->play_audio_lock);
pthread_mutex_unlock(&jd->play_audio_lock);
}
}
return 0;
}
const struct audio_output_plugin jackPlugin = {
.name = "jack",
.test_default_device = jack_testDefault,
.init = jack_initDriver,
.finish = jack_finishDriver,
.open = jack_openDevice,
.play = jack_playAudio,
.cancel = jack_dropBufferedAudio,
.close = jack_closeDevice,
};
#else /* HAVE JACK */
DISABLED_AUDIO_OUTPUT_PLUGIN(jackPlugin)
#endif /* HAVE_JACK */