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/* ------------------------------------------------------------------
* Copyright (C) 2011 Martin Storsjo
* Copyright (C) 2016 Matthias P. Braendli
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
#include <cstdio>
#include <string>
#include "config.h"
#if HAVE_JACK
extern "C" {
#include <jack/jack.h>
}
#include "JackInput.h"
#include <sys/time.h>
using namespace std;
int JackInput::prepare()
{
jack_options_t options = JackNullOption;
jack_status_t status;
const char *server_name = NULL;
m_client = jack_client_open(m_jack_name, options, &status, server_name);
if (m_client == NULL) {
fprintf(stderr, "jack_client_open() failed, "
"status = 0x%2.0x\n", status);
if (status & JackServerFailed) {
fprintf(stderr, "Unable to connect to JACK server\n");
}
return -1;
}
if (status & JackServerStarted) {
fprintf(stderr, "JACK server started\n");
}
if (status & JackNameNotUnique) {
fprintf(stderr, "JACK name '%s' not unique!\n", m_jack_name);
return -1;
}
/* Set up real-time process callback */
jack_set_process_callback(m_client, process_cb, this);
/* tell the JACK server to call `shutdown_cb' if
it ever shuts down, either entirely, or if it
just decides to stop calling us. */
jack_on_shutdown(m_client, shutdown_cb, this);
if (m_rate != jack_get_sample_rate(m_client)) {
fprintf(stderr, "JACK uses different sample_rate %d "
"than requested (%d)!\n",
jack_get_sample_rate(m_client),
m_rate);
return -1;
}
/* create ports */
for (int i = 0; i < m_channels; i++) {
std::stringstream port_name;
port_name << "input" << i;
jack_port_t* input_port = jack_port_register(m_client,
port_name.str().c_str(),
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsInput,
0);
if (input_port == NULL) {
fprintf(stderr, "no more JACK ports available\n");
return -1;
}
m_input_ports.push_back(input_port);
}
/* Tell the JACK server that we are ready to roll. Our
* process() callback will start running now. */
if (jack_activate(m_client)) {
fprintf (stderr, "JACK: cannot activate client");
return -1;
}
return 0;
}
void JackInput::jack_process(jack_nframes_t nframes)
{
/*! JACK works with float samples, we need to convert
* them to shorts first. This is done using a saturated
* conversion to avoid glitches.
*/
std::vector<int16_t> buffer(m_channels * nframes);
for (int chan = 0; chan < m_channels; chan++) {
// start offset interleaving
int i = chan;
const int dst_skip = m_channels;
jack_default_audio_sample_t* src =
(jack_default_audio_sample_t*)jack_port_get_buffer(m_input_ports[chan], nframes);
jack_nframes_t n = nframes;
while (n--) {
if (*src <= -1.0f) {
buffer[i] = 32767;
}
else if (*src >= 1.0f) {
buffer[i] = -32768;
}
else {
buffer[i] =
(int16_t)lrintf(*src * 32768.0f);
}
i += dst_skip;
src++;
}
}
m_queue.push((uint8_t*)&buffer.front(), buffer.size() * sizeof(uint16_t));
}
#endif // HAVE_JACK
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