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/******************************************************************************
* recordMyDesktop *
*******************************************************************************
* *
* Copyright (C) 2006,2007,2008 John Varouhakis *
* *
* *
* 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 *
* *
* *
* *
* For further information contact me at johnvarouhakis@gmail.com *
******************************************************************************/
#include "config.h"
#include "rmd_jack.h"
#include "rmd_types.h"
#include <pthread.h>
#include <string.h>
#ifdef HAVE_LIBJACK
/**
* Callback for capture through jack
*
* \param nframes Number of frames captured
*
* \param jdata_t Pointer to JackData struct containing port
* and client information
*
* \returns Zero always
*/
static int JackCapture(jack_nframes_t nframes,void *jdata_t) {
int i=0;
JackData *jdata=(JackData *)jdata_t;
if (!jdata->pdata->running || jdata->pdata->paused || !jdata->capture_started) {
return 0;
}
for(i= 0;i<jdata->nports;i++)
jdata->portbuf[i]=jack_port_get_buffer(jdata->ports[i],nframes);
//vorbis analysis buffer wants uninterleaved data
//so we are simply placing the buffers for every channel
//sequentially on the ringbuffer
for(i=0;i<jdata->nports;i++)
(*jack_ringbuffer_write)(jdata->sound_buffer,
(void *)(jdata->portbuf[i]),
nframes*
sizeof(jack_default_audio_sample_t));
/*FIXME */
//This is not safe.
//cond_var signaling must move away from signal handlers
//alltogether (JackCapture, SetExpired, SetPaused).
//Better would be a set of pipes for each of these.
//The callback should write on the pipe and the main thread
//should perform a select over the fd's, signaling afterwards the
//appropriate cond_var.
pthread_mutex_lock(jdata->snd_buff_ready_mutex);
pthread_cond_signal(jdata->sound_data_read);
pthread_mutex_unlock(jdata->snd_buff_ready_mutex);
return 0;
}
/**
* Register and Activate specified ports
*
* \param jdata_t Pointer to JackData struct containing port
* and client information
*
* \returns 0 on Success, 1 on failure
*/
static int SetupPorts(JackData *jdata) {
int i=0;
jdata->ports=malloc(sizeof(jack_port_t *)*
jdata->nports);
jdata->portbuf=malloc(sizeof(jack_default_audio_sample_t*)*
jdata->nports);
memset(jdata->portbuf,0,sizeof(jack_default_audio_sample_t*)*
jdata->nports);
for(i=0;i<jdata->nports;i++){
char name[64];//recordMyDesktop:input_n<64 is enough for full name
char num[8];
strcpy(name,"input_");
snprintf( num, 8, "%d", i+1 );
strcat(name,num);
if((jdata->ports[i]=jack_port_register(jdata->client,
name,
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsInput,
0))==0){
fprintf(stderr,"Cannot register input port \"%s\"!\n",name);
return 1;
}
if(jack_connect(jdata->client,
jdata->port_names[i],
jack_port_name(jdata->ports[i]))){
fprintf(stderr,"Cannot connect input port %s to %s\n",
jack_port_name(jdata->ports[i]),
jdata->port_names[i]);
return 1;
}
}
return 0;
}
//in case the jack server shuts down
//the program should stop recording,
//encode the result(if not on the fly)
//an exit cleanly.
static void JackShutdown(void *jdata_t) {
JackData *jdata = (JackData *)jdata_t;
jdata->pdata->running = FALSE;
fprintf (stderr, "JACK shutdown\n");
}
int StartJackClient(JackData *jdata){
float ring_buffer_size=0.0;
int pid;
char pidbuf[8];
char rmd_client_name[32];
//construct the jack client name
//which is recordMyDesktop-pid
//in order to allow multiple
//instances of recordMyDesktop
//to connetc to a Jack Server
strcpy(rmd_client_name,"recordMyDesktop-");
pid=getpid();
snprintf( pidbuf, 8, "%d", pid );
strcat(rmd_client_name,pidbuf);
if ((jdata->client=(*jack_client_new)(rmd_client_name))==0){
fprintf(stderr,"Could not create new client!\n"
"Make sure that Jack server is running!\n");
return 15;
}
//in contrast to ALSA and OSS, Jack dictates frequency
//and buffersize to the values it was launched with.
//Supposedly jack_set_buffer_size can set the buffersize
//but that causes some kind of halt and keeps giving me
//zero buffers.
//recordMyDesktop cannot handle buffer size changes.
//FIXME
//There is a callback for buffer size changes that I should use.
//It will provide clean exits, instead of ?segfaults? .
//Continuing though is not possible, with the current layout
//(it might be in some cases, but it will certainly be the cause
//of unpredicted problems). A clean exit is preferable
//and any recording up to that point will be encoded and saved.
jdata->frequency=jack_get_sample_rate(jdata->client);
jdata->buffersize=jack_get_buffer_size(jdata->client);
ring_buffer_size=(jdata->ringbuffer_secs*
jdata->frequency*
sizeof(jack_default_audio_sample_t)*
jdata->nports);
jdata->sound_buffer=
(*jack_ringbuffer_create)((int)(ring_buffer_size+0.5));//round up
jack_set_process_callback(jdata->client,JackCapture,jdata);
jack_on_shutdown(jdata->client,JackShutdown,jdata);
if (jack_activate(jdata->client)) {
fprintf(stderr,"cannot activate client!\n");
return 16;
}
if(SetupPorts(jdata)){
jack_client_close(jdata->client);
return 17;
}
return 0;
}
int StopJackClient(JackData *jdata){
int ret=0;
(*jack_ringbuffer_free)(jdata->sound_buffer);
if(jack_client_close(jdata->client)){
fprintf(stderr,"Cannot close Jack client!\n");
ret=1;
}
/*TODO*/
//I need to make some kind of program/thread
//flow diagram to see where it's safe to dlclose
//because here it causes a segfault.
// if(dlclose(jdata->jack_lib_handle)){
// fprintf(stderr,"Cannot unload Jack library!\n");
// ret=1;
// }
// else fprintf(stderr,"Unloaded Jack library.\n");
return ret;
}
#endif
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