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module-rtp: Add process.latency.from.sess prop to set process latency

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This commit is contained in:
Carlos Rafael Giani 2025-09-15 12:19:05 +02:00
parent 63df661eff
commit 65e49b38d1
1 changed files with 31 additions and 1 deletions
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32
src/modules/module-rtp/stream.c
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@ -614,10 +614,11 @@ struct rtp_stream *rtp_stream_new(struct pw_core *core,
struct spa_pod_builder b; struct spa_pod_builder b;
uint32_t n_params, min_samples, max_samples; uint32_t n_params, min_samples, max_samples;
float min_ptime, max_ptime; float min_ptime, max_ptime;
const struct spa_pod *params[1]; const struct spa_pod *params[3];
enum pw_stream_flags flags; enum pw_stream_flags flags;
float latency_msec; float latency_msec;
int res; int res;
bool process_latency_from_sess;
impl = calloc(1, sizeof(*impl)); impl = calloc(1, sizeof(*impl));
if (impl == NULL) { if (impl == NULL) {
@ -901,6 +902,8 @@ struct rtp_stream *rtp_stream_new(struct pw_core *core,
pw_properties_set(props, "rtp.ts-refclk", str); pw_properties_set(props, "rtp.ts-refclk", str);
} }
process_latency_from_sess = pw_properties_get_bool(props, "process.latency.from.sess", false);
spa_dll_init(&impl->dll); spa_dll_init(&impl->dll);
spa_dll_set_bw(&impl->dll, SPA_DLL_BW_MIN, 128, impl->rate); spa_dll_set_bw(&impl->dll, SPA_DLL_BW_MIN, 128, impl->rate);
impl->corr = 1.0; impl->corr = 1.0;
@ -943,6 +946,33 @@ struct rtp_stream *rtp_stream_new(struct pw_core *core,
goto out; goto out;
} }
if (process_latency_from_sess) {
/* If process.latency.from.sess is set to true, then the sess.latency.msec
* quantity is to be set as the process latency at startup. But since the
* sess.latency.msec value is converted to impl->target_buffer, and that
* quantity in turn is subjected to constraint checks (see above), it is
* possible that the _actual_ session latency no longer equals the value
* of sess.latency.msec by the time this location is reached. To take into
* account these constraint adjustments, convert back the impl->target_buffer
* to nanoseconds, and use that as the process latency.
*
* Then, just like how update_latency_params() does it, construct the
* SPA_PARAM_Latency and SPA_PARAM_ProcessLatency params to let the new
* pw_stream know of these latency figures right from the start. */
struct spa_latency_info latency;
impl->process_latency.ns = (int64_t)(impl->target_buffer * 1e9 / impl->rate);
pw_log_debug("set process latency to %" PRId64 " based on sess.latency.msec "
"value %f", impl->process_latency.ns, latency_msec);
latency = SPA_LATENCY_INFO(impl->direction);
spa_process_latency_info_add(&(impl->process_latency), &latency);
params[n_params++] = spa_latency_build(&b, SPA_PARAM_Latency, &latency);
params[n_params++] = spa_process_latency_build(&b, SPA_PARAM_ProcessLatency,
&(impl->process_latency));
}
pw_stream_add_listener(impl->stream, pw_stream_add_listener(impl->stream,
&impl->stream_listener, &impl->stream_listener,
&impl->stream_events, impl); &impl->stream_events, impl);