static gboolean
gst_alsasink_unprepare (GstAudioSink * asink)
{
GstAlsaSink *alsa;
gint err;
alsa = GST_ALSA_SINK (asink);
CHECK (snd_pcm_drop (alsa->handle), drop);
CHECK (snd_pcm_hw_free (alsa->handle), hw_free);
return TRUE;
/* ERRORS */
drop:
{
GST_ELEMENT_ERROR (alsa, RESOURCE, SETTINGS, (NULL),
("Could not drop samples: %s", snd_strerror (err)));
return FALSE;
}
hw_free:
{
GST_ELEMENT_ERROR (alsa, RESOURCE, SETTINGS, (NULL),
("Could not free hw params: %s", snd_strerror (err)));
return FALSE;
}
}
static int snd_pcm_file_hw_free(snd_pcm_t *pcm)
{
snd_pcm_file_t *file = pcm->private_data;
free(file->wbuf);
free(file->wbuf_areas);
file->wbuf = NULL;
file->wbuf_areas = NULL;
return snd_pcm_hw_free(file->gen.slave);
}
static gboolean
gst_alsasink_unprepare (GstAudioSink * asink)
{
GstAlsaSink *alsa;
alsa = GST_ALSA_SINK (asink);
snd_pcm_drop (alsa->handle);
snd_pcm_hw_free (alsa->handle);
return TRUE;
}
static gboolean
gst_alsasrc_unprepare (GstAudioSrc * asrc)
{
GstAlsaSrc *alsa;
alsa = GST_ALSA_SRC (asrc);
snd_pcm_drop (alsa->handle);
snd_pcm_hw_free (alsa->handle);
snd_pcm_nonblock (alsa->handle, 1);
return TRUE;
}
int snd_pcm_close(snd_pcm_t *pcm)
{
if (pcm->setup) {
snd_pcm_drop(pcm);
snd_pcm_hw_free(pcm);
}
_snd_pcm_munmap(pcm);
snd_pcm_hw_munmap_status(pcm);
#if SALSA_HAS_ASYNC_SUPPORT
if (pcm->async)
snd_async_del_handler(pcm->async);
#endif
close(pcm->fd);
free(pcm);
return 0;
}
/** Fills the input buffer with audio data from the microphone.
*
* @param data the buffer to fill with audio data
* @param len the size of the buffer
* @return a pointer to the filled buffer
*/
uint16_t VoiceStreamer::fillBuffer(char *data, int len) {
int latency, bufsize, room_left = len;
size_t frames_in, frames_out, in_max;
ssize_t r;
char *buffer, *data_ptr = data;
bool done = false;
latency = latency_min - 4;
bufsize = (latency_max*snd_pcm_format_width(format)/8)*2;
buffer = new char[bufsize];
while (!done) {
while (frames_in < loop_limit) {
if ((r = readbuf(chandle, buffer, latency, &frames_in,
&in_max)) < 0) {
break;
} else {
if (room_left > r<<2) {
memcpy(data_ptr, buffer, r<<2);
data_ptr += (r<<2);
room_left -= (r<<2);
} else {
memcpy(data_ptr, buffer, room_left);
data_ptr += room_left;
room_left = 0;
done = true;
break;
}
}
}
if (!done) {
snd_pcm_drop(chandle);
snd_pcm_unlink(chandle);
snd_pcm_hw_free(chandle);
frames_in = frames_out = in_max = 0;
if (setparams_c(chandle, &latency) < 0)
break;
}
}
return uint16_t (len - room_left);
}
int snd_pcm_generic_hw_free(snd_pcm_t *pcm)
{
snd_pcm_generic_t *generic = pcm->private_data;
return snd_pcm_hw_free(generic->slave);
}
int main(int argc, char *argv[])
{
struct option long_option[] =
{
{"help", 0, NULL, 'h'},
{"pdevice", 1, NULL, 'P'},
{"cdevice", 1, NULL, 'C'},
{"min", 1, NULL, 'm'},
{"max", 1, NULL, 'M'},
{"frames", 1, NULL, 'F'},
{"format", 1, NULL, 'f'},
{"channels", 1, NULL, 'c'},
{"rate", 1, NULL, 'r'},
{"seconds", 1, NULL, 's'},
{"block", 0, NULL, 'b'},
{"time", 1, NULL, 't'},
{"poll", 0, NULL, 'p'},
{"effect", 0, NULL, 'e'},
{NULL, 0, NULL, 0},
};
snd_pcm_t *phandle, *chandle;
char *buffer;
int err, latency, morehelp;
int ok;
snd_timestamp_t p_tstamp, c_tstamp;
ssize_t r;
size_t frames_in, frames_out, in_max;
int effect = 0;
morehelp = 0;
while (1) {
int c;
if ((c = getopt_long(argc, argv, "hP:C:m:M:F:f:c:r:s:bt:pe", long_option, NULL)) < 0)
break;
switch (c) {
case 'h':
morehelp++;
break;
case 'P':
pdevice = strdup(optarg);
break;
case 'C':
cdevice = strdup(optarg);
break;
case 'm':
err = atoi(optarg) / 2;
latency_min = err >= 4 ? err : 4;
if (latency_max < latency_min)
latency_max = latency_min;
break;
case 'M':
err = atoi(optarg) / 2;
latency_max = latency_min > err ? latency_min : err;
break;
case 'f':
format = snd_pcm_format_value(optarg);
if (format == SND_PCM_FORMAT_UNKNOWN) {
printf("Unknown format, setting to default S16_LE\n");
format = SND_PCM_FORMAT_S16_LE;
}
break;
case 'c':
err = atoi(optarg);
channels = err >= 1 && err < 1024 ? err : 1;
break;
case 'r':
err = atoi(optarg);
rate = err >= 4000 && err < 200000 ? err : 44100;
break;
case 's':
err = atoi(optarg);
loop_sec = err >= 1 && err <= 100000 ? err : 30;
break;
case 'b':
block = 1;
break;
case 't':
tick_time = atoi(optarg);
tick_time = tick_time < 0 ? 0 : tick_time;
break;
case 'p':
use_poll = 1;
break;
case 'e':
effect = 1;
break;
}
}
if (morehelp) {
help();
return 0;
}
err = snd_output_stdio_attach(&output, stdout, 0);
if (err < 0) {
printf("Output failed: %s\n", snd_strerror(err));
return 0;
}
loop_limit = loop_sec * rate;
latency = latency_min - 4;
buffer = malloc((latency_max * snd_pcm_format_width(format) / 8) * 2);
setscheduler();
printf("Playback device is %s\n", pdevice);
printf("Capture device is %s\n", cdevice);
printf("Parameters are %iHz, %s, %i channels, %s mode\n", rate, snd_pcm_format_name(format), channels, block ? "blocking" : "non-blocking");
printf("Wanted tick time: %ius, poll mode: %s\n", tick_time, use_poll ? "yes" : "no");
printf("Loop limit is %li frames, minimum latency = %i, maximum latency = %i\n", loop_limit, latency_min * 2, latency_max * 2);
if ((err = snd_pcm_open(&phandle, pdevice, SND_PCM_STREAM_PLAYBACK, block ? 0 : SND_PCM_NONBLOCK)) < 0) {
printf("Playback open error: %s\n", snd_strerror(err));
return 0;
}
if ((err = snd_pcm_open(&chandle, cdevice, SND_PCM_STREAM_CAPTURE, block ? 0 : SND_PCM_NONBLOCK)) < 0) {
printf("Record open error: %s\n", snd_strerror(err));
return 0;
}
/* initialize the filter sweep variables */
if (effect) {
fs = (float) rate;
BW = FILTER_BANDWIDTH;
lfo = 0;
dlfo = 2.*M_PI*FILTERSWEEP_LFO_FREQ/fs;
x[0] = (float*) malloc(channels*sizeof(float));
x[1] = (float*) malloc(channels*sizeof(float));
x[2] = (float*) malloc(channels*sizeof(float));
y[0] = (float*) malloc(channels*sizeof(float));
y[1] = (float*) malloc(channels*sizeof(float));
y[2] = (float*) malloc(channels*sizeof(float));
}
while (1) {
frames_in = frames_out = 0;
if (setparams(phandle, chandle, &latency) < 0)
break;
showlatency(latency);
if (tick_time_ok)
printf("Using tick time %ius\n", tick_time_ok);
if ((err = snd_pcm_link(chandle, phandle)) < 0) {
printf("Streams link error: %s\n", snd_strerror(err));
exit(0);
}
if (snd_pcm_format_set_silence(format, buffer, latency*channels) < 0) {
fprintf(stderr, "silence error\n");
break;
}
if (writebuf(phandle, buffer, latency, &frames_out) < 0) {
fprintf(stderr, "write error\n");
break;
}
if (writebuf(phandle, buffer, latency, &frames_out) < 0) {
fprintf(stderr, "write error\n");
break;
}
if ((err = snd_pcm_start(chandle)) < 0) {
printf("Go error: %s\n", snd_strerror(err));
exit(0);
}
gettimestamp(phandle, &p_tstamp);
gettimestamp(chandle, &c_tstamp);
#if 0
printf("Playback:\n");
showstat(phandle, frames_out);
printf("Capture:\n");
showstat(chandle, frames_in);
#endif
ok = 1;
in_max = 0;
while (ok && frames_in < loop_limit) {
if (use_poll) {
/* use poll to wait for next event */
snd_pcm_wait(chandle, 1000);
}
if ((r = readbuf(chandle, buffer, latency, &frames_in, &in_max)) < 0)
ok = 0;
else {
if (effect)
applyeffect(buffer,r);
if (writebuf(phandle, buffer, r, &frames_out) < 0)
ok = 0;
}
}
if (ok)
printf("Success\n");
else
printf("Failure\n");
printf("Playback:\n");
showstat(phandle, frames_out);
printf("Capture:\n");
showstat(chandle, frames_in);
showinmax(in_max);
if (p_tstamp.tv_sec == p_tstamp.tv_sec &&
p_tstamp.tv_usec == c_tstamp.tv_usec)
printf("Hardware sync\n");
snd_pcm_drop(chandle);
snd_pcm_nonblock(phandle, 0);
snd_pcm_drain(phandle);
snd_pcm_nonblock(phandle, !block ? 1 : 0);
if (ok) {
#if 1
printf("Playback time = %li.%i, Record time = %li.%i, diff = %li\n",
p_tstamp.tv_sec,
(int)p_tstamp.tv_usec,
c_tstamp.tv_sec,
(int)c_tstamp.tv_usec,
timediff(p_tstamp, c_tstamp));
#endif
break;
}
snd_pcm_unlink(chandle);
snd_pcm_hw_free(phandle);
snd_pcm_hw_free(chandle);
}
snd_pcm_close(phandle);
snd_pcm_close(chandle);
return 0;
}
static int alsa_stream(const char *pdevice, const char *cdevice, int latency)
{
snd_pcm_t *phandle, *chandle;
char *buffer;
int err;
ssize_t r;
struct final_params negotiated;
snd_pcm_format_t format = SND_PCM_FORMAT_S16_LE;
char pdevice_new[32];
err = snd_output_stdio_attach(&output, error_fp, 0);
if (err < 0) {
fprintf(error_fp, "alsa: Output failed: %s\n", snd_strerror(err));
return 0;
}
/* Open the devices */
if ((err = snd_pcm_open(&phandle, pdevice, SND_PCM_STREAM_PLAYBACK,
0)) < 0) {
fprintf(error_fp, "alsa: Cannot open playback device %s: %s\n",
pdevice, snd_strerror(err));
return 0;
}
if ((err = snd_pcm_open(&chandle, cdevice, SND_PCM_STREAM_CAPTURE,
SND_PCM_NONBLOCK)) < 0) {
fprintf(error_fp, "alsa: Cannot open capture device %s: %s\n",
cdevice, snd_strerror(err));
snd_pcm_close(phandle);
return 0;
}
err = setparams(phandle, chandle, format, latency, 0, &negotiated);
/* Try to use plughw instead, as it allows emulating speed */
if (err == 2 && strncmp(pdevice, "hw", 2) == 0) {
snd_pcm_close(phandle);
sprintf(pdevice_new, "plug%s", pdevice);
pdevice = pdevice_new;
if (verbose)
fprintf(error_fp, "alsa: Trying %s for playback\n", pdevice);
if ((err = snd_pcm_open(&phandle, pdevice, SND_PCM_STREAM_PLAYBACK,
0)) < 0) {
fprintf(error_fp, "alsa: Cannot open playback device %s: %s\n",
pdevice, snd_strerror(err));
snd_pcm_close(chandle);
return 0;
}
err = setparams(phandle, chandle, format, latency, 1, &negotiated);
}
if (err != 0) {
fprintf(error_fp, "alsa: setparams failed\n");
snd_pcm_close(phandle);
snd_pcm_close(chandle);
return 1;
}
buffer = malloc((negotiated.bufsize * snd_pcm_format_width(format) / 8)
* negotiated.channels);
if (buffer == NULL) {
fprintf(error_fp, "alsa: Failed allocating buffer for audio\n");
snd_pcm_close(phandle);
snd_pcm_close(chandle);
return 0;
}
if (verbose)
fprintf(error_fp,
"alsa: stream started from %s to %s (%i Hz, buffer delay = %.2f ms)\n",
cdevice, pdevice, negotiated.rate,
negotiated.latency * 1000.0 / negotiated.rate);
while (!stop_alsa) {
/* We start with a read and not a wait to auto(re)start the capture */
r = readbuf(chandle, buffer, negotiated.bufsize);
if (r == 0) /* Succesfully recovered from an overrun? */
continue; /* Force restart of capture stream */
if (r > 0)
writebuf(phandle, buffer, r);
/* use poll to wait for next event */
while (!stop_alsa && !snd_pcm_wait(chandle, 50))
;
}
snd_pcm_drop(chandle);
snd_pcm_drop(phandle);
snd_pcm_unlink(chandle);
snd_pcm_hw_free(phandle);
snd_pcm_hw_free(chandle);
snd_pcm_close(phandle);
snd_pcm_close(chandle);
return 0;
}
/** Plays the audio contained packets queue that is filled by the
* chatting thread with received packets.
*/
void VoiceStreamer::playbackAudio() {
int data_left, r;
packet audioPacket;
uint8_t *data_ptr;
bool done = false;
int pLatency = latency_min - 4;
size_t pframes_in, pframes_out, pin_max;
// Init playback device
if (setparams_p(phandle, &pLatency) < 0) {
fprintf(stderr, "Playback Audio Thread: exiting due to setparams_p error\n");
return;
}
pframes_in = pframes_out = 0;
pin_max = 0;
while (true) {
if (!popAudioPacket(audioPacket))
break;
data_ptr = audioPacket.data;
data_left = (int) ntohs(audioPacket.dlength);
while (pframes_in < loop_limit) {
if (data_left > (pLatency<<2))
r = pLatency;
else
r = data_left>>2;
if (r > 0) {
pframes_in += r;
if ((int) pin_max < r)
pin_max = r;
if (writebuf(phandle, (char *) data_ptr, r, &pframes_out) < 0) {
break;
}
} else if (r == 0) { // done reading input file
done = true;
break;
} else {
break;
}
if (data_left > (pLatency<<2)) {
data_ptr += (pLatency<<2);
data_left -= (pLatency<<2);
} else {
data_ptr += data_left;
data_left = 0;
}
}
if (!done) {
done = false;
snd_pcm_nonblock(phandle, 0);
snd_pcm_drain(phandle);
snd_pcm_hw_free(phandle);
pframes_in = pframes_out = pin_max = 0;
if (setparams_p(phandle, &pLatency) < 0) {
fprintf(stderr, "setparams_p < 0!\n");
break;
}
}
}
startPlayback = false;
fprintf(stderr, "Playback Audio Thread exitting!\n");
}