mirrors/pipewire
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/pipewire/pipewire.git synced 2025-11-12 13:30:15 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

buffer: add option to reverse filter priority

Browse source 
By default, buffer negotiation favours the default property values of
the output node. Make this configurable and reverse this logic when the
output is a driver.

This makes it so that a stream connecting to a source will negotiate
with the preferences of the stream and not the source.

An example is a stream that wants 4 buffers from v4l2-source, because
v4l2-source has a default of 4 buffers, this will always result in 4
buffers, ignoring the preference of the stream.
This commit is contained in:
Wim Taymans 2022-11-04 15:22:01 +01:00
parent 503bb94645
commit 7631316186
3 changed files with 10 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

6
src/pipewire/buffers.c
View file

@ -255,6 +255,12 @@ int pw_buffers_negotiate(struct pw_context *context, uint32_t flags,
struct port input = { innode, SPA_DIRECTION_INPUT, in_port_id };
int res;
if (flags & PW_BUFFERS_FLAG_IN_PRIORITY) {
struct port tmp = output;
output = input;
input = tmp;
}
res = param_filter(result, &input, &output, SPA_PARAM_Buffers, &b);
if (res < 0) {
pw_context_debug_port_params(context, input.node, input.direction,

1
src/pipewire/buffers.h
View file

@ -48,6 +48,7 @@ extern "C" {
#define PW_BUFFERS_FLAG_SHARED (1<<1) /**< buffers can be shared */
#define PW_BUFFERS_FLAG_DYNAMIC (1<<2) /**< buffers have dynamic data */
#define PW_BUFFERS_FLAG_SHARED_MEM (1<<3) /**< buffers need shared memory */
#define PW_BUFFERS_FLAG_IN_PRIORITY (1<<4) /**< input parameters have priority */
struct pw_buffers {
struct pw_memblock *mem; /**< allocated buffer memory */

3
src/pipewire/impl-link.c
View file

@ -517,6 +517,9 @@ static int do_allocation(struct pw_impl_link *this)
if (output->node->remote || input->node->remote)
alloc_flags |= PW_BUFFERS_FLAG_SHARED_MEM;
if (output->node->driver)
alloc_flags |= PW_BUFFERS_FLAG_IN_PRIORITY;
/* if output port can alloc buffers, alloc skeleton buffers */
if (SPA_FLAG_IS_SET(out_flags, SPA_PORT_FLAG_CAN_ALLOC_BUFFERS)) {
SPA_FLAG_SET(alloc_flags, PW_BUFFERS_FLAG_NO_MEM);