[FFmpeg-devel] [PATCH v3] avcodec/amfenc: add smart access video option

[Evgeny Pavlov <lucenticus@gmail.com>]

This commit adds option for enabling SmartAccess Video (SAV)
in AMF encoders. SAV is an AMD hardware-specific feature which
enables the parallelization of encode and decode streams across
multiple Video Codec Engine (VCN) hardware instances.

Signed-off-by: Evgeny Pavlov <lucenticus@gmail.com>
---
 libavcodec/amfenc.c      | 11 +++++++++++
 libavcodec/amfenc.h      |  6 ++++++
 libavcodec/amfenc_av1.c  |  8 ++++++++
 libavcodec/amfenc_h264.c |  8 ++++++++
 libavcodec/amfenc_hevc.c |  8 ++++++++
 5 files changed, 41 insertions(+)

diff --git a/libavcodec/amfenc.c b/libavcodec/amfenc.c
index 061859f85c..c48eb27056 100644
--- a/libavcodec/amfenc.c
+++ b/libavcodec/amfenc.c
@@ -369,6 +369,17 @@ static int amf_init_encoder(AVCodecContext *avctx)
     res = ctx->factory->pVtbl->CreateComponent(ctx->factory, ctx->context, codec_id, &ctx->encoder);
     AMF_RETURN_IF_FALSE(ctx, res == AMF_OK, AVERROR_ENCODER_NOT_FOUND, "CreateComponent(%ls) failed with error %d\n", codec_id, res);
 
+    if (ctx->smart_access_video != -1) {
+        AMF_ASSIGN_PROPERTY_BOOL(res, ctx->encoder, AMF_PER_CODEC_OPTION(ENABLE_SMART_ACCESS_VIDEO), ctx->smart_access_video != 0);
+        if (res != AMF_OK) {
+            av_log(avctx, AV_LOG_ERROR, "The Smart Access Video is not supported by AMF.\n");
+            if (ctx->smart_access_video != 0)
+                return AVERROR(ENOSYS);
+        } else {
+            av_log(avctx, AV_LOG_INFO, "The Smart Access Video (%d) is set.\n", ctx->smart_access_video);
+        }
+    }
+
     return 0;
 }
 
diff --git a/libavcodec/amfenc.h b/libavcodec/amfenc.h
index 2dbd378ef8..9bb3278bc5 100644
--- a/libavcodec/amfenc.h
+++ b/libavcodec/amfenc.h
@@ -89,6 +89,7 @@ typedef struct AmfContext {
     int                 quality;
     int                 b_frame_delta_qp;
     int                 ref_b_frame_delta_qp;
+    int                 smart_access_video;
 
     // Dynamic options, can be set after Init() call
 
@@ -179,4 +180,9 @@ extern const enum AVPixelFormat ff_amf_pix_fmts[];
         return ret_value; \
     }
 
+#define AMF_PER_CODEC_OPTION(name) \
+   (avctx->codec->id == AV_CODEC_ID_AV1  ? AMF_VIDEO_ENCODER_AV1_  ## name : \
+    avctx->codec->id == AV_CODEC_ID_HEVC ? AMF_VIDEO_ENCODER_HEVC_ ## name : \
+                                           AMF_VIDEO_ENCODER_      ## name)
+
 #endif //AVCODEC_AMFENC_H
diff --git a/libavcodec/amfenc_av1.c b/libavcodec/amfenc_av1.c
index 3f164ccc59..06ce566f39 100644
--- a/libavcodec/amfenc_av1.c
+++ b/libavcodec/amfenc_av1.c
@@ -104,6 +104,8 @@ static const AVOption options[] = {
 
     { "log_to_dbg",     "Enable AMF logging to debug output",   OFFSET(log_to_dbg), AV_OPT_TYPE_BOOL,{.i64 = 0 }, 0, 1, VE },
 
+    { "smart_access_video",     "Enable parallelization of encode and decode streams across multiple VCN hardware instances",  OFFSET(smart_access_video),  AV_OPT_TYPE_BOOL, {.i64 = -1  }, -1, 1, VE},
+
     //Pre Analysis options
     { "preanalysis",                            "Enable preanalysis",                                           OFFSET(preanalysis),                            AV_OPT_TYPE_BOOL,   {.i64 = -1 }, -1, 1, VE },
 
@@ -243,6 +245,12 @@ FF_ENABLE_DEPRECATION_WARNINGS
         }
     }
 
+    // Set low latency mode if Smart Access Video is enabled
+    if (ctx->smart_access_video == 1) {
+        AMF_ASSIGN_PROPERTY_BOOL(res, ctx->encoder, AMF_VIDEO_ENCODER_AV1_ENCODING_LATENCY_MODE, AMF_VIDEO_ENCODER_AV1_ENCODING_LATENCY_MODE_LOWEST_LATENCY);
+        av_log(avctx, AV_LOG_INFO, "The Smart Access Video set low latency mode.\n");
+    }
+
     // Pre-Pass, Pre-Analysis, Two-Pass
     if (ctx->rate_control_mode == AMF_VIDEO_ENCODER_AV1_RATE_CONTROL_METHOD_CONSTANT_QP) {
         AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_AV1_RATE_CONTROL_PREENCODE, 0);
diff --git a/libavcodec/amfenc_h264.c b/libavcodec/amfenc_h264.c
index bd544d12df..9b36a8b088 100644
--- a/libavcodec/amfenc_h264.c
+++ b/libavcodec/amfenc_h264.c
@@ -136,6 +136,8 @@ static const AVOption options[] = {
 
     { "log_to_dbg",     "Enable AMF logging to debug output",   OFFSET(log_to_dbg)    , AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
 
+    { "smart_access_video",  "Enable parallelization of encode and decode streams across multiple VCN hardware instances",  OFFSET(smart_access_video), AV_OPT_TYPE_BOOL, {.i64 = -1  }, -1, 1, VE},
+
     //Pre Analysis options
     { "preanalysis",                            "Enable preanalysis",                                           OFFSET(preanalysis),                            AV_OPT_TYPE_BOOL,   {.i64 = -1 }, -1, 1, VE },
 
@@ -353,6 +355,12 @@ FF_ENABLE_DEPRECATION_WARNINGS
         av_log(ctx, AV_LOG_WARNING, "rate control mode is PEAK_CONSTRAINED_VBR but rc_max_rate is not set\n");
     }
 
+    // Set low latency mode if Smart Access Video is enabled
+    if (ctx->smart_access_video == 1) {
+        AMF_ASSIGN_PROPERTY_BOOL(res, ctx->encoder, AMF_VIDEO_ENCODER_LOWLATENCY_MODE, true);
+        av_log(avctx, AV_LOG_INFO, "The Smart Access Video set low latency mode.\n");
+    }
+
     if (ctx->preanalysis != -1) {
         AMF_ASSIGN_PROPERTY_BOOL(res, ctx->encoder, AMF_VIDEO_ENCODER_PRE_ANALYSIS_ENABLE, !!((ctx->preanalysis == 0) ? false : true));
     }
diff --git a/libavcodec/amfenc_hevc.c b/libavcodec/amfenc_hevc.c
index 352564a301..7ccac37d15 100644
--- a/libavcodec/amfenc_hevc.c
+++ b/libavcodec/amfenc_hevc.c
@@ -99,6 +99,8 @@ static const AVOption options[] = {
 
     { "log_to_dbg",     "Enable AMF logging to debug output",   OFFSET(log_to_dbg), AV_OPT_TYPE_BOOL,{ .i64 = 0 }, 0, 1, VE },
 
+    { "smart_access_video", "Enable parallelization of encode and decode streams across multiple VCN hardware instances",   OFFSET(smart_access_video), AV_OPT_TYPE_BOOL, {.i64 = -1  }, -1, 1, VE},
+
     //Pre Analysis options
     { "preanalysis",                            "Enable preanalysis",                                           OFFSET(preanalysis),                            AV_OPT_TYPE_BOOL,   {.i64 = -1 }, -1, 1, VE },
 
@@ -241,6 +243,12 @@ FF_ENABLE_DEPRECATION_WARNINGS
         }
     }
 
+    // Set low latency mode if Smart Access Video is enabled
+    if (ctx->smart_access_video != -1 && ctx->smart_access_video != 0) {
+        AMF_ASSIGN_PROPERTY_BOOL(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_LOWLATENCY_MODE, true);
+        av_log(avctx, AV_LOG_INFO, "The Smart Access Video set low latency mode.\n");
+    }
+
     // Pre-Pass, Pre-Analysis, Two-Pass
     if (ctx->rate_control_mode == AMF_VIDEO_ENCODER_HEVC_RATE_CONTROL_METHOD_CONSTANT_QP) {
         AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_PREENCODE_ENABLE, 0);
-- 
2.42.0

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