These patches bring the volume ramping feature that has not been applied to upstream. This topic was also mentioned a few weeks ago. : https://lists.freedesktop.org/archives/pulseaudio-discuss/2016-June/026459.html The original patches are at below. : https://lists.freedesktop.org/archives/pulseaudio-discuss/2012-August/014351.html Here are resubmitting patches without client API part as we discussed on IRC before. Please note that these are from tizen project, because it seems more refined than the above original patches. And volume ramp factor APIs are added to sink-input which will be used instead of the previous volume ramp setting API of sink-input. Notes: v2 changelog - Not applying the commit "volume ramp: add volume ramping to sink" - Added volume ramp factor to sink-input Jaska Uimonen (2): volume ramp: additions to the low level infra volume ramp: adding volume ramping to sink-input Sangchul Lee (3): sink-input: Code cleanup regarding volume ramping sink-input, volume: Add support for volume ramp factor sink-input: Remove pa_sink_input_set_volume_ramp() src/map-file | 7 + src/pulse/def.h | 13 +- src/pulse/volume.c | 118 ++++++++++++++++- src/pulse/volume.h | 42 ++++++ src/pulsecore/mix.c | 310 +++++++++++++++++++++++++++++++++++++++++++++ src/pulsecore/mix.h | 27 ++++ src/pulsecore/sink-input.c | 143 +++++++++++++++++++++ src/pulsecore/sink-input.h | 16 ++- 8 files changed, 673 insertions(+), 3 deletions(-) -- 2.7.4