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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <ctype.h>
#include "galsa.h"
struct device *device_open(const char *path, unsigned rate, int chan, size_t pktsize)
{
struct device *dev;
snd_pcm_hw_params_t *hw_params = NULL;
snd_pcm_t *hdl = NULL;
char errmsg[256];
#define E(x) do { int err; if ((err = x) < 0) { \
snprintf(errmsg, sizeof(errmsg), "%s:%d/%s(): %s() failed: %s (%d)\n",\
__FILE__, __LINE__, __func__, #x, snd_strerror(err), err); \
goto out_err; \
} } while (0)
printf("Opening alsa://%s with %d ch %dHz...\n", path, chan, rate);
E(snd_pcm_open(&hdl, path, SND_PCM_STREAM_CAPTURE, 0));
E(snd_pcm_hw_params_malloc(&hw_params));
E(snd_pcm_hw_params_any(hdl, hw_params));
E(snd_pcm_hw_params_set_access(hdl, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED));
E(snd_pcm_hw_params_set_format(hdl, hw_params, SND_PCM_FORMAT_S16_LE));
E(snd_pcm_hw_params_set_rate_near(hdl, hw_params, &rate, 0));
E(snd_pcm_hw_params_set_channels(hdl, hw_params, chan));
E(snd_pcm_hw_params(hdl, hw_params));
snd_pcm_hw_params_free(hw_params);
hw_params = NULL;
E(snd_pcm_prepare(hdl));
printf("... Ok.\n");
dev = (struct device *)malloc(sizeof(struct device));
dev->path = strdup(path);
dev->rate = rate;
dev->chan = chan;
dev->handle = hdl;
dev->thread = NULL;
dev->queue = g_async_queue_new();
dev->state = DEV_OPEN;
dev->pktsize = pktsize;
return dev;
out_err:
if (hw_params)
snd_pcm_hw_params_free(hw_params);
if (hdl)
snd_pcm_close(hdl);
return NULL;
}
static gpointer threadf(gpointer param)
{
struct device *dev = (struct device *)param;
struct qe *ent, *entx;
int pcmreturn;
ptrdiff_t pos;
do {
ent = malloc(sizeof(struct qe) +
dev->pktsize * sizeof(sample) * dev->chan);
ent->message = QE_DATA;
ent->size = dev->pktsize;
pos = 0;
do {
while ((pcmreturn = snd_pcm_readi(dev->handle,
ent->samples + pos, ent->size - pos)) < 0) {
entx = calloc(sizeof(struct qe), 1);
entx->message = QE_ERROR;
entx->errcode = pcmreturn;
asprintf(&entx->errp,
"PCM read failed: %s (%d)",
snd_strerror(pcmreturn), pcmreturn);
g_async_queue_push(dev->queue, entx);
if (dev->state != DEV_RUNNING) {
free(ent);
goto out;
}
snd_pcm_prepare(dev->handle);
}
pos += pcmreturn;
} while (pos < ent->size);
g_async_queue_push(dev->queue, ent);
} while (dev->state == DEV_RUNNING);
out:
entx = calloc(sizeof(struct qe), 1);
entx->message = QE_STOPPED;
g_async_queue_push(dev->queue, entx);
return NULL;
}
void device_start(struct device *dev)
{
GError *error = NULL;
if (dev->thread)
return;
dev->state = DEV_RUNNING;
dev->thread = g_thread_create(threadf, dev, 0, &error);
}
void device_stop(struct device *dev)
{
if (dev->state == DEV_RUNNING)
dev->state = DEV_STOPREQ;
}
void device_stop_wait(struct device *dev)
{
int got_stop = 0, iter = 0;
struct qe *qe;
if (dev->state == DEV_OPEN)
return;
device_stop(dev);
while (!got_stop && iter++ < 10) {
qe = (struct qe *)g_async_queue_timeout_pop(dev->queue, 250000);
switch (qe->message) {
case QE_DATA:
break;
case QE_ERROR:
free(qe->errp);
break;
case QE_STOPPED:
got_stop = 1;
break;
}
free(qe);
}
if (!got_stop)
fprintf(stderr, "failed to terminate recording thread!\n");
dev->state = DEV_OPEN;
}
void device_stop_done(struct device *dev)
{
dev->state = DEV_OPEN;
}
void device_close(struct device *dev)
{
device_stop_wait(dev);
snd_pcm_close(dev->handle);
free(dev->path);
free(dev);
}
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