void pa_echo_canceller_get_capture_volume(pa_echo_canceller *ec, pa_cvolume *v);
void pa_echo_canceller_set_capture_volume(pa_echo_canceller *ec, pa_cvolume *v);
+/* Computes EC block size in frames (rounded down to nearest power-of-2) based
+ * on sample rate and milliseconds. */
+uint32_t pa_echo_canceller_blocksize_power2(unsigned rate, unsigned ms);
+
/* Null canceller functions */
pa_bool_t pa_null_ec_init(pa_core *c, pa_echo_canceller *ec,
pa_sample_spec *source_ss, pa_channel_map *source_map,
}
}
+uint32_t pa_echo_canceller_blocksize_power2(unsigned rate, unsigned ms) {
+ unsigned nframes = (rate * ms) / 1000;
+ uint32_t y = 1 << ((8 * sizeof(uint32_t)) - 2);
+
+ assert(rate >= 4000);
+ assert(ms >= 1);
+
+ /* nframes should be a power of 2, round down to nearest power of two */
+ while (y > nframes)
+ y >>= 1;
+
+ assert(y >= 1);
+ return y;
+}
+
static pa_echo_canceller_method_t get_ec_method_from_string(const char *method) {
if (pa_streq(method, "null"))
return PA_ECHO_CANCELLER_NULL;
uint32_t *nframes, const char *args)
{
int rate;
- uint32_t y, frame_size_ms, filter_size_ms;
+ uint32_t frame_size_ms, filter_size_ms;
pa_modargs *ma;
if (!(ma = pa_modargs_new(args, valid_modargs))) {
pa_speex_ec_fixate_spec(source_ss, source_map, sink_ss, sink_map);
rate = source_ss->rate;
- *nframes = (rate * frame_size_ms) / 1000;
- /* nframes should be a power of 2, round down to nearest power of two */
- y = 1 << ((8 * sizeof (uint32_t)) - 2);
- while (y > *nframes)
- y >>= 1;
- *nframes = y;
+ *nframes = pa_echo_canceller_blocksize_power2(rate, frame_size_ms);
pa_log_debug ("Using nframes %d, channels %d, rate %d", *nframes, source_ss->channels, source_ss->rate);
-
- ec->params.priv.speex.state = speex_echo_state_init_mc (*nframes, (rate * filter_size_ms) / 1000, source_ss->channels, source_ss->channels);
+ ec->params.priv.speex.state = speex_echo_state_init_mc(*nframes, (rate * filter_size_ms) / 1000, source_ss->channels, source_ss->channels);
if (!ec->params.priv.speex.state)
goto fail;