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module-loopback: add target.delay.sec property

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Add a target.delay.sec property to module-loopback that uses a
ringbuffer to further delay the signal to the requested value. This
also takes into account the graph delay to get an end-to-end delay.

Add a -d property to pw-loopback to control this.

Implement latency_msec on the pulse module with this new property so
that it behaves similar to pulseaudio.
This commit is contained in:
Wim Taymans 2022-10-20 16:02:28 +02:00
parent 35c9650e0e
commit 24b113e2d3
3 changed files with 137 additions and 15 deletions
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13
src/tools/pw-loopback.c
View file

@ -57,6 +57,7 @@ struct data {
uint32_t channels;
uint32_t latency;
float delay;
struct pw_properties *capture_props;
struct pw_properties *playback_props;
@ -93,6 +94,7 @@ static void show_help(struct data *data, const char *name, bool error)
" -c, --channels Number of channels (default %d)\n"
" -m, --channel-map Channel map (default '%s')\n"
" -l, --latency Desired latency in ms\n"
" -d, --delay Desired delay in float s\n"
" -C --capture Capture source to connect to\n"
" --capture-props Capture stream properties\n"
" -P --playback Playback sink to connect to\n"
@ -109,7 +111,7 @@ int main(int argc, char *argv[])
struct data data = { 0 };
struct pw_loop *l;
const char *opt_remote = NULL;
char cname[256];
char cname[256], value[256];
char *args;
size_t size;
FILE *f;
@ -121,6 +123,7 @@ int main(int argc, char *argv[])
{ "name", required_argument, NULL, 'n' },
{ "channels", required_argument, NULL, 'c' },
{ "latency", required_argument, NULL, 'l' },
{ "delay", required_argument, NULL, 'd' },
{ "capture", required_argument, NULL, 'C' },
{ "playback", required_argument, NULL, 'P' },
{ "capture-props", required_argument, NULL, 'i' },
@ -146,7 +149,7 @@ int main(int argc, char *argv[])
goto exit;
}
while ((c = getopt_long(argc, argv, "hVr:n:g:c:m:l:C:P:i:o:", long_options, NULL)) != -1) {
while ((c = getopt_long(argc, argv, "hVr:n:g:c:m:l:d:C:P:i:o:", long_options, NULL)) != -1) {
switch (c) {
case 'h':
show_help(&data, argv[0], false);
@ -177,6 +180,9 @@ int main(int argc, char *argv[])
case 'l':
data.latency = atoi(optarg) * DEFAULT_RATE / SPA_MSEC_PER_SEC;
break;
case 'd':
data.delay = atof(optarg);
break;
case 'C':
pw_properties_set(data.capture_props, PW_KEY_NODE_TARGET, optarg);
break;
@ -223,6 +229,9 @@ int main(int argc, char *argv[])
fprintf(f, " remote.name = \"%s\"", opt_remote);
if (data.latency != 0)
fprintf(f, " node.latency = %u/%u", data.latency, DEFAULT_RATE);
if (data.delay != 0.0f)
fprintf(f, " target.delay.sec = %s",
spa_json_format_float(value, sizeof(value), data.delay));
if (data.channels != 0)
fprintf(f, " audio.channels = %u", data.channels);
if (data.opt_channel_map != NULL)