[FFmpeg-devel] [PATCH v4] libsvtav1: Add logical_processors option

[Christopher Degawa]

From: Christopher Degawa <christopher.degawa at intel.com>

Used for limiting the size of memory buffers and threads for a target
logical processor count, but does not set thread affinity or the total
amount of threads used, although thread affinities can be controlled
with an additional parameters, it is prefered to add them until
a svtav1-params option or similar is added

Signed-off-by: Christopher Degawa <christopher.degawa at intel.com>
---
 doc/encoders.texi      | 6 ++++++
 libavcodec/libsvtav1.c | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index c9c8785afb..7bb97d9dae 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -1795,6 +1795,12 @@ Set log2 of the number of rows of tiles to use (0-6).
 @item tile_columns
 Set log2 of the number of columns of tiles to use (0-4).

+ at item logical_processors
+Number of logical processors to run the encoder on, threads are managed by the OS scheduler.
+Used for limiting the size of memory buffers and threads for a target logical processor count.
+Does not set thread affinity or total threads, but instead sets t * logical_processors amount of threads
+with t being the amount of threads libsvtav1 sets per cpu (0 - ncpus).
+
 @end table

 @section libkvazaar
diff --git a/libavcodec/libsvtav1.c b/libavcodec/libsvtav1.c
index eb6043bcac..087b14099f 100644
--- a/libavcodec/libsvtav1.c
+++ b/libavcodec/libsvtav1.c
@@ -71,6 +71,8 @@ typedef struct SvtContext {

     int tile_columns;
     int tile_rows;
+
+    unsigned logical_processors;
 } SvtContext;

 static const struct {
@@ -218,6 +220,8 @@ static int config_enc_params(EbSvtAv1EncConfiguration *param,
     param->tile_columns = svt_enc->tile_columns;
     param->tile_rows    = svt_enc->tile_rows;

+    param->logical_processors = svt_enc->logical_processors;
+
     return 0;
 }

@@ -533,6 +537,9 @@ static const AVOption options[] = {
     { "tile_columns", "Log2 of number of tile columns to use", OFFSET(tile_columns), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 4, VE},
     { "tile_rows", "Log2 of number of tile rows to use", OFFSET(tile_rows), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 6, VE},

+    { "logical_processors", "Number of logical processors to run the encoder on, used to limit the size of memory buffers and threads used", OFFSET(logical_processors),
+      AV_OPT_TYPE_INT, { .i64 = 0 }, 0,  INT_MAX, VE },
+
     {NULL},
 };

--
2.25.1