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/**
* @file jack_src.c JACK audio driver -- source
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include <math.h>
#include <jack/jack.h>
#include "mod_jack.h"
struct ausrc_st {
const struct ausrc *as; /* pointer to base-class (inheritance) */
struct ausrc_prm prm;
int16_t *sampv;
size_t sampc; /* includes number of channels */
ausrc_read_h *rh;
void *arg;
jack_client_t *client;
jack_port_t *portv[2];
jack_nframes_t nframes; /* num frames per port (channel) */
};
static inline int16_t ausamp_float2short(float in)
{
double scaled_value;
int16_t out;
scaled_value = in * (8.0 * 0x10000000);
if (scaled_value >= (1.0 * 0x7fffffff)) {
out = 32767;
}
else if (scaled_value <= (-8.0 * 0x10000000)) {
out = -32768;
}
else
out = (short) (lrint (scaled_value) >> 16);
return out;
}
static int process_handler(jack_nframes_t nframes, void *arg)
{
struct ausrc_st *st = arg;
size_t sampc = nframes * st->prm.ch;
size_t ch, j;
/* 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++) {
const 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;
samp = ausamp_float2short(buffer[j]);
st->sampv[j*st->prm.ch + ch] = samp;
}
}
/* 1. read data from app (signed 16-bit) interleaved */
st->rh(st->sampv, sampc, st->arg);
return 0;
}
static void ausrc_destructor(void *arg)
{
struct ausrc_st *st = arg;
info("jack: source destroy\n");
if (st->client)
jack_client_close(st->client);
mem_deref(st->sampv);
}
static int start_jack(struct ausrc_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), "input_%u", ch+1);
st->portv[ch] = jack_port_register(st->client, buf,
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsInput, 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;
}
ports = jack_get_ports (st->client, NULL, NULL,
JackPortIsOutput);
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, ports[ch],
jack_port_name(st->portv[ch]))) {
warning("jack: cannot connect output ports\n");
}
}
jack_free(ports);
return 0;
}
int jack_src_alloc(struct ausrc_st **stp, const struct ausrc *as,
struct media_ctx **ctx,
struct ausrc_prm *prm, const char *device,
ausrc_read_h *rh, ausrc_error_h *errh, void *arg)
{
struct ausrc_st *st;
int err = 0;
(void)ctx;
(void)device;
(void)errh;
if (!stp || !as || !prm || !rh)
return EINVAL;
if (prm->ch > ARRAY_SIZE(st->portv))
return EINVAL;
if (prm->fmt != AUFMT_S16LE) {
warning("jack: source: unsupported sample format (%s)\n",
aufmt_name(prm->fmt));
return ENOTSUP;
}
st = mem_zalloc(sizeof(*st), ausrc_destructor);
if (!st)
return ENOMEM;
st->prm = *prm;
st->as = as;
st->rh = rh;
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: source sampc=%zu\n", st->sampc);
out:
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
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