[FFmpeg-devel] [PATCH] avcodec/vaapi_encode: add customized surface alignment

[Araz Iusubov <primeadvice@gmail.com>]

This commit fixes issues with AMD HEVC encoding. 
By default AMD hevc encoder asks for the alignment 64x16, while FFMPEG VAAPI has 16x16. 
Adding support for customzied surface size from VASurfaceAttribAlignmentSize in VAAPI version 1.21.0.

To: Primeadvice@gmail.com

Signed-off-by: Araz Iusubov <Primeadvice@gmail.com>
---
 libavcodec/vaapi_encode.c   | 11 +++++++++++
 libavutil/hwcontext.h       |  7 +++++++
 libavutil/hwcontext_vaapi.c |  5 +++++
 3 files changed, 23 insertions(+)

diff --git a/libavcodec/vaapi_encode.c b/libavcodec/vaapi_encode.c
index 808b79c0c7..dc1b7465b7 100644
--- a/libavcodec/vaapi_encode.c
+++ b/libavcodec/vaapi_encode.c
@@ -2700,6 +2700,17 @@ static av_cold int vaapi_encode_create_recon_frames(AVCodecContext *avctx)
     av_log(avctx, AV_LOG_DEBUG, "Using %s as format of "
            "reconstructed frames.\n", av_get_pix_fmt_name(recon_format));
 
+    if (constraints->log2_alignment) {
+        ctx->surface_width = FFALIGN(avctx->width,
+                              1 << (constraints->log2_alignment & 0xf));
+        ctx->surface_height = FFALIGN(avctx->height,
+                              1 << ((constraints->log2_alignment & 0xf0) >> 4));
+        av_log(avctx, AV_LOG_VERBOSE, "Using customized alignment size "
+                "[%dx%d].\n",
+                (1 << (constraints->log2_alignment & 0xf)),
+                (1 << ((constraints->log2_alignment & 0xf0) >> 4)));
+    }
+
     if (ctx->surface_width  < constraints->min_width  ||
         ctx->surface_height < constraints->min_height ||
         ctx->surface_width  > constraints->max_width ||
diff --git a/libavutil/hwcontext.h b/libavutil/hwcontext.h
index df7733fe5e..5725245be4 100644
--- a/libavutil/hwcontext.h
+++ b/libavutil/hwcontext.h
@@ -481,6 +481,13 @@ typedef struct AVHWFramesConstraints {
      */
     int max_width;
     int max_height;
+
+    /**
+     * The frame width/height log2 alignment when available
+     * the lower 4 bits, width; another 4 bits, height
+     * (Zero is not applied, use the default value)
+     */
+    int log2_alignment;
 } AVHWFramesConstraints;
 
 /**
diff --git a/libavutil/hwcontext_vaapi.c b/libavutil/hwcontext_vaapi.c
index 2c75f5f5b1..161623bc27 100644
--- a/libavutil/hwcontext_vaapi.c
+++ b/libavutil/hwcontext_vaapi.c
@@ -294,6 +294,11 @@ static int vaapi_frames_get_constraints(AVHWDeviceContext *hwdev,
             case VASurfaceAttribMaxHeight:
                 constraints->max_height = attr_list[i].value.value.i;
                 break;
+#if VA_CHECK_VERSION(1, 21, 0)
+            case VASurfaceAttribAlignmentSize:
+                constraints->log2_alignment = attr_list[i].value.value.i;
+                break;
+#endif
             }
         }
         if (pix_fmt_count == 0) {
-- 
2.43.0.windows.1

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