Experimental; requires Skylake and VAAPI 0.39.1 (not yet released).
---
Just a flag to enable for now. Needs better dynamic detection of features
(notably the Skylake implementation does not support B-frames, and we could
detect this via config attributes), though that is generally true for all of
the setup here.
Runs a bit more than twice as fast as normal H.264 encode on my Skylake test
machine (6300).
---
libavcodec/vaapi_encode_h264.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/libavcodec/vaapi_encode_h264.c b/libavcodec/vaapi_encode_h264.c
index 8690a85..1f0008b 100644
--- a/libavcodec/vaapi_encode_h264.c
+++ b/libavcodec/vaapi_encode_h264.c
@@ -126,6 +126,7 @@ typedef struct VAAPIEncodeH264Context {
typedef struct VAAPIEncodeH264Options {
int qp;
int quality;
+ int low_power;
} VAAPIEncodeH264Options;
@@ -851,6 +852,14 @@ static av_cold int
vaapi_encode_h264_init_internal(AVCodecContext *avctx)
return AVERROR(EINVAL);
}
ctx->va_entrypoint = VAEntrypointEncSlice;
+ if (opt->low_power) {
+#if VA_CHECK_VERSION(0, 39, 1)
+ ctx->va_entrypoint = VAEntrypointEncSliceLP;
+#else
+ av_log(avctx, AV_LOG_WARNING, "Low-power encoding is not "
+ "supported with this VAAPI version.\n");
+#endif
+ }
ctx->input_width = avctx->width;
ctx->input_height = avctx->height;
@@ -933,7 +942,9 @@ static const AVOption vaapi_encode_h264_options[] = {
{ "qp", "Constant QP (for P-frames; scaled by qfactor/qoffset for I/B)",
OFFSET(qp), AV_OPT_TYPE_INT, { .i64 = 20 }, 0, 52, FLAGS },
{ "quality", "Set encode quality (trades off against speed, higher is
faster)",
- OFFSET(quality), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, FLAGS },
+ OFFSET(quality), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 8, FLAGS },
+ { "low-power", "Use low-power encoding mode (experimental!)",
+ OFFSET(low_power), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
{ NULL },
};
--
2.8.1
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