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jack.cc
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jack.cc
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#include "jack.h"
int
process (jack_nframes_t nframes, void *arg)
{
AudioDriver * driver = (AudioDriver *) arg ;
jack_default_audio_sample_t *in, *out;
in = (float *)jack_port_get_buffer (driver -> input_port, nframes);
out = (float *)jack_port_get_buffer (driver -> output_port, nframes);
driver -> processor -> process (nframes, in, out);
return 0;
}
/**
* JACK calls this shutdown_callback if the server ever shuts down or
* decides to disconnect the client.
*/
void
jack_shutdown (void *arg)
{
exit (1);
}
bool AudioDriver::activate () {
if (jack_activate (client)) {
fprintf (stderr, "cannot activate client");
return false ;
}
/* Connect the ports. You can't do this before the client is
* activated, because we can't make connections to clients
* that aren't running. Note the confusing (but necessary)
* orientation of the driver backend ports: playback ports are
* "input" to the backend, and capture ports are "output" from
* it.
*/
i_ports = jack_get_ports (client, NULL, NULL,
JackPortIsPhysical|JackPortIsOutput);
if (i_ports == NULL) {
fprintf(stderr, "no physical capture ports\n");
return false ;
}
if (jack_connect (client, i_ports[0], jack_port_name (input_port))) {
fprintf (stderr, "cannot connect input ports\n");
}
o_ports = jack_get_ports (client, NULL, NULL,
JackPortIsPhysical|JackPortIsInput);
if (o_ports == NULL) {
fprintf(stderr, "no physical playback ports\n");
return false ;
}
if (jack_connect (client, jack_port_name (output_port), o_ports[0])) {
fprintf (stderr, "cannot connect output ports\n");
return false ;
}
LOGD ("[audio engine ok]");
free (i_ports);
free (o_ports);
return true ;
}
bool AudioDriver::deactivate () {
if (jack_deactivate (client)) {
fprintf (stderr, "cannot deactivate client");
return false ;
}
return true ;
}
bool AudioDriver::open () {
client = jack_client_open (client_name, options, &status, server_name);
if (client == NULL) {
fprintf (stderr, "jack_client_open() failed, "
"status = 0x%2.0x\n", status);
return false ;
}
if (status & JackServerFailed) {
fprintf (stderr, "Unable to connect to JACK server\n");
return false ;
}
if (status & JackServerStarted) {
fprintf (stderr, "JACK server started\n");
}
if (status & JackNameNotUnique) {
client_name = jack_get_client_name(client);
fprintf (stderr, "unique name `%s' assigned\n", client_name);
}
jack_set_process_callback (client, process, this);
jack_on_shutdown (client, jack_shutdown, 0);
printf ("engine sample rate: %" PRIu32 "\n",
jack_get_sample_rate (client));
/* create two ports */
input_port = jack_port_register (client, "input",
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsInput, 0);
output_port = jack_port_register (client, "output",
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsOutput, 0);
if ((input_port == NULL) || (output_port == NULL)) {
fprintf(stderr, "no more JACK ports available\n");
exit (1);
}
/* Tell the JACK server that we are ready to roll. Our
* process() callback will start running now. */
return activate () ;
}
void AudioDriver::close () {
jack_client_close (client);
}
int AudioDriver::get_sample_rate () {
return jack_get_sample_rate (client);
}
int AudioDriver::get_buffer_size () {
return jack_get_buffer_size (client);
}