+/* Called from main context */
+static void compute_reference_ratios(pa_sink *s) {
+ uint32_t idx;
+ pa_sink_input *i;
+
+ pa_sink_assert_ref(s);
+ pa_assert_ctl_context();
+ pa_assert(PA_SINK_IS_LINKED(s->state));
+ pa_assert(s->flags & PA_SINK_FLAT_VOLUME);
+
+ PA_IDXSET_FOREACH(i, s->inputs, idx) {
+ unsigned c;
+ pa_cvolume remapped;
+
+ /*
+ * Calculates the reference volume from the sink's reference
+ * volume. This basically calculates:
+ *
+ * i->reference_ratio = i->volume / s->reference_volume
+ */
+
+ remapped = s->reference_volume;
+ pa_cvolume_remap(&remapped, &s->channel_map, &i->channel_map);
+
+ i->reference_ratio.channels = i->sample_spec.channels;
+
+ for (c = 0; c < i->sample_spec.channels; c++) {
+
+ /* We don't update when the sink volume is 0 anyway */
+ if (remapped.values[c] <= PA_VOLUME_MUTED)
+ continue;
+
+ /* Don't update the reference ratio unless necessary */
+ if (pa_sw_volume_multiply(
+ i->reference_ratio.values[c],
+ remapped.values[c]) == i->volume.values[c])
+ continue;
+
+ i->reference_ratio.values[c] = pa_sw_volume_divide(
+ i->volume.values[c],
+ remapped.values[c]);
+ }
+ }
+}
+
+/* Called from main context */
+static void compute_real_ratios(pa_sink *s) {
+ pa_sink_input *i;
+ uint32_t idx;
+
+ pa_sink_assert_ref(s);
+ pa_assert_ctl_context();
+ pa_assert(PA_SINK_IS_LINKED(s->state));
+ pa_assert(s->flags & PA_SINK_FLAT_VOLUME);
+
+ PA_IDXSET_FOREACH(i, s->inputs, idx) {
+ unsigned c;
+ pa_cvolume remapped;
+
+ /*
+ * This basically calculates:
+ *
+ * i->real_ratio := i->volume / s->real_volume
+ * i->soft_volume := i->real_ratio * i->volume_factor
+ */
+
+ remapped = s->real_volume;
+ pa_cvolume_remap(&remapped, &s->channel_map, &i->channel_map);
+
+ i->real_ratio.channels = i->sample_spec.channels;
+ i->soft_volume.channels = i->sample_spec.channels;
+
+ for (c = 0; c < i->sample_spec.channels; c++) {
+
+ if (remapped.values[c] <= PA_VOLUME_MUTED) {
+ /* We leave i->real_ratio untouched */
+ i->soft_volume.values[c] = PA_VOLUME_MUTED;
+ continue;
+ }
+
+ /* Don't lose accuracy unless necessary */
+ if (pa_sw_volume_multiply(
+ i->real_ratio.values[c],
+ remapped.values[c]) != i->volume.values[c])
+
+ i->real_ratio.values[c] = pa_sw_volume_divide(
+ i->volume.values[c],
+ remapped.values[c]);
+
+ i->soft_volume.values[c] = pa_sw_volume_multiply(
+ i->real_ratio.values[c],
+ i->volume_factor.values[c]);
+ }
+
+ /* We don't copy the soft_volume to the thread_info data
+ * here. That must be done by the caller */
+ }
+}
+