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/**
* @file jack.c JACK audio driver -- player
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include <jack/jack.h>
#include "mod_jack.h"
struct auplay_st {
const struct auplay *ap; /* pointer to base-class (inheritance) */
struct auplay_prm prm;
int16_t *sampv;
size_t sampc; /* includes number of channels */
auplay_write_h *wh;
void *arg;
jack_client_t *client;
jack_port_t *portv[2];
jack_nframes_t nframes; /* num frames per port (channel) */
};
static inline float ausamp_short2float(int16_t in)
{
float out;
out = (float) (in / (1.0 * 0x8000));
return out;
}
/**
* The process callback for this JACK application is called in a
* special realtime thread once for each audio cycle.
*
* This client does nothing more than copy data from its input
* port to its output port. It will exit when stopped by
* the user (e.g. using Ctrl-C on a unix-ish operating system)
*
* XXX avoid memory allocations in this function
*/
static int process_handler(jack_nframes_t nframes, void *arg)
{
struct auplay_st *st = arg;
size_t sampc = nframes * st->prm.ch;
size_t ch, j;
/* 1. read data from app (signed 16-bit) interleaved */
st->wh(st->sampv, sampc, st->arg);
/* 2. convert from 16-bit to float and copy to Jack */
/* 3. de-interleave [LRLRLRLR] -> [LLLLL]+[RRRRR] */
for (ch = 0; ch < st->prm.ch; ch++) {
jack_default_audio_sample_t *buffer;
buffer = jack_port_get_buffer(st->portv[ch], st->nframes);
for (j = 0; j < nframes; j++) {
int16_t samp = st->sampv[j*st->prm.ch + ch];
buffer[j] = ausamp_short2float(samp);
}
}
return 0;
}
static void auplay_destructor(void *arg)
{
struct auplay_st *st = arg;
info("jack: destroy\n");
if (st->client)
jack_client_close(st->client);
mem_deref(st->sampv);
}
static int start_jack(struct auplay_st *st)
{
const char **ports;
const char *client_name = "baresip";
const char *server_name = NULL;
jack_options_t options = JackNullOption;
jack_status_t status;
unsigned ch;
jack_nframes_t engine_srate;
/* open a client connection to the JACK server */
st->client = jack_client_open(client_name, options,
&status, server_name);
if (st->client == NULL) {
warning("jack: jack_client_open() failed, "
"status = 0x%2.0x\n", status);
if (status & JackServerFailed) {
warning("jack: Unable to connect to JACK server\n");
}
return ENODEV;
}
if (status & JackServerStarted) {
info("jack: JACK server started\n");
}
if (status & JackNameNotUnique) {
client_name = jack_get_client_name(st->client);
info("jack: unique name `%s' assigned\n", client_name);
}
jack_set_process_callback(st->client, process_handler, st);
engine_srate = jack_get_sample_rate(st->client);
st->nframes = jack_get_buffer_size(st->client);
info("jack: engine sample rate: %" PRIu32 " max_frames=%u\n",
engine_srate, st->nframes);
/* currently the application must use the same sample-rate
as the jack server backend */
if (engine_srate != st->prm.srate) {
warning("jack: samplerate %uHz expected\n", engine_srate);
return EINVAL;
}
/* create one port per channel */
for (ch=0; ch<st->prm.ch; ch++) {
char buf[32];
re_snprintf(buf, sizeof(buf), "output_%u", ch+1);
st->portv[ch] = jack_port_register (st->client, buf,
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsOutput, 0);
if ( st->portv[ch] == NULL) {
warning("jack: no more JACK ports available\n");
return ENODEV;
}
}
/* Tell the JACK server that we are ready to roll. Our
* process() callback will start running now. */
if (jack_activate (st->client)) {
warning("jack: cannot activate client");
return ENODEV;
}
/* 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.
*/
ports = jack_get_ports (st->client, NULL, NULL,
JackPortIsInput);
if (ports == NULL) {
warning("jack: no physical playback ports\n");
return ENODEV;
}
for (ch=0; ch<st->prm.ch; ch++) {
if (jack_connect (st->client, jack_port_name (st->portv[ch]),
ports[ch])) {
warning("jack: cannot connect output ports\n");
}
}
jack_free(ports);
return 0;
}
int jack_play_alloc(struct auplay_st **stp, const struct auplay *ap,
struct auplay_prm *prm, const char *device,
auplay_write_h *wh, void *arg)
{
struct auplay_st *st;
int err = 0;
(void)device;
if (!stp || !ap || !prm || !wh)
return EINVAL;
info("jack: play %uHz,%uch\n", prm->srate, prm->ch);
if (prm->ch > ARRAY_SIZE(st->portv))
return EINVAL;
if (prm->fmt != AUFMT_S16LE) {
warning("jack: playback: unsupported sample format (%s)\n",
aufmt_name(prm->fmt));
return ENOTSUP;
}
st = mem_zalloc(sizeof(*st), auplay_destructor);
if (!st)
return ENOMEM;
st->prm = *prm;
st->ap = ap;
st->wh = wh;
st->arg = arg;
err = start_jack(st);
if (err)
goto out;
st->sampc = st->nframes * prm->ch;
st->sampv = mem_alloc(st->sampc * sizeof(int16_t), NULL);
if (!st->sampv) {
err = ENOMEM;
goto out;
}
info("jack: sampc=%zu\n", st->sampc);
out:
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
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