[FFmpeg-devel] [PATCH v6 1/2] lavc/vaapi_encode: add support for maxframesize

[Fei Wang <fei.w.wang-at-intel.com@ffmpeg.org>]

From: Linjie Fu <linjie.fu@intel.com>

Add support for max frame size:
    - max_frame_size (bytes) to indicate the max allowed size for frame.

If the frame size exceeds the limitation, encoder will to control the frame
size by adjusting QP value.

ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -f rawvideo \
        -v verbose -s:v 352x288 -i ./input.yuv -vf format=nv12,hwupload \
        -c:v h264_vaapi -profile:v main -g 30 -rc_mode VBR -b:v 500k   \
        -bf 3 -max_frame_size 40000 -vframes 100 -y ./max_frame_size.h264

Max frame size was enabled since VA-API version (0, 33, 0), but query is available
since (1, 5, 0). It will be passed as a parameter in picParam and should be set
for each frame.

Signed-off-by: Linjie Fu <linjie.fu@intel.com>
Signed-off-by: Fei Wang <fei.w.wang@intel.com>
---
update:
Set ctx->max_frame_size to 0 in CQP mode to avoid to pass
VAEncMiscParameterTypeMaxFrameSize type VABuffer.

 libavcodec/vaapi_encode.c | 72 +++++++++++++++++++++++++++++++++++++++
 libavcodec/vaapi_encode.h | 10 +++++-
 2 files changed, 81 insertions(+), 1 deletion(-)

diff --git a/libavcodec/vaapi_encode.c b/libavcodec/vaapi_encode.c
index 0e2f5ed447..3b96d4c671 100644
--- a/libavcodec/vaapi_encode.c
+++ b/libavcodec/vaapi_encode.c
@@ -365,6 +365,17 @@ static int vaapi_encode_issue(AVCodecContext *avctx,
             goto fail;
     }
 
+#if VA_CHECK_VERSION(1, 5, 0)
+    if (ctx->max_frame_size) {
+        err = vaapi_encode_make_misc_param_buffer(avctx, pic,
+                                                  VAEncMiscParameterTypeMaxFrameSize,
+                                                  &ctx->mfs_params,
+                                                  sizeof(ctx->mfs_params));
+        if (err < 0)
+            goto fail;
+    }
+#endif
+
     if (pic->type == PICTURE_TYPE_IDR) {
         if (ctx->va_packed_headers & VA_ENC_PACKED_HEADER_SEQUENCE &&
             ctx->codec->write_sequence_header) {
@@ -1869,6 +1880,61 @@ rc_mode_found:
     return 0;
 }
 
+static av_cold int vaapi_encode_init_max_frame_size(AVCodecContext *avctx)
+{
+#if VA_CHECK_VERSION(1, 5, 0)
+    VAAPIEncodeContext  *ctx = avctx->priv_data;
+    VAConfigAttrib      attr = { VAConfigAttribMaxFrameSize };
+    VAStatus vas;
+
+    if (ctx->va_rc_mode == VA_RC_CQP) {
+        ctx->max_frame_size = 0;
+        av_log(avctx, AV_LOG_WARNING, "Max frame size is invalid in CQP rate "
+               "control mode.\n");
+        return 0;
+    }
+
+    vas = vaGetConfigAttributes(ctx->hwctx->display,
+                                ctx->va_profile,
+                                ctx->va_entrypoint,
+                                &attr, 1);
+    if (vas != VA_STATUS_SUCCESS) {
+        ctx->max_frame_size = 0;
+        av_log(avctx, AV_LOG_ERROR, "Failed to query max frame size "
+               "config attribute: %d (%s).\n", vas, vaErrorStr(vas));
+        return AVERROR_EXTERNAL;
+    }
+
+    if (attr.value == VA_ATTRIB_NOT_SUPPORTED) {
+        ctx->max_frame_size = 0;
+        av_log(avctx, AV_LOG_WARNING, "Max frame size attribute "
+               "is not supported.\n");
+    } else {
+        VAConfigAttribValMaxFrameSize attr_mfs;
+        attr_mfs.value = attr.value;
+        // Prefer to use VAEncMiscParameterTypeMaxFrameSize for max frame size.
+        if (!attr_mfs.bits.max_frame_size && attr_mfs.bits.multiple_pass) {
+            ctx->max_frame_size = 0;
+            av_log(avctx, AV_LOG_WARNING, "Driver only support multiple pass "
+                   "max frame size which have not been implemented in FFmpeg.\n");
+            return 0;
+        }
+
+        ctx->mfs_params = (VAEncMiscParameterBufferMaxFrameSize){
+            .max_frame_size = ctx->max_frame_size * 8,
+        };
+
+        av_log(avctx, AV_LOG_VERBOSE, "Max Frame Size: %d bytes.\n",
+               ctx->max_frame_size);
+    }
+#else
+    av_log(avctx, AV_LOG_WARNING, "Max Frame Size is not support with "
+           "this VA version.\n");
+#endif
+
+    return 0;
+}
+
 static av_cold int vaapi_encode_init_gop_structure(AVCodecContext *avctx)
 {
     VAAPIEncodeContext *ctx = avctx->priv_data;
@@ -2548,6 +2614,12 @@ av_cold int ff_vaapi_encode_init(AVCodecContext *avctx)
             goto fail;
     }
 
+    if (ctx->max_frame_size) {
+        err = vaapi_encode_init_max_frame_size(avctx);
+        if (err < 0)
+            goto fail;
+    }
+
     vas = vaCreateConfig(ctx->hwctx->display,
                          ctx->va_profile, ctx->va_entrypoint,
                          ctx->config_attributes, ctx->nb_config_attributes,
diff --git a/libavcodec/vaapi_encode.h b/libavcodec/vaapi_encode.h
index af0588c30b..359f954fff 100644
--- a/libavcodec/vaapi_encode.h
+++ b/libavcodec/vaapi_encode.h
@@ -191,6 +191,9 @@ typedef struct VAAPIEncodeContext {
     // Desired B frame reference depth.
     int             desired_b_depth;
 
+    // Max Frame Size
+    int             max_frame_size;
+
     // Explicitly set RC mode (otherwise attempt to pick from
     // available modes).
     int             explicit_rc_mode;
@@ -268,6 +271,7 @@ typedef struct VAAPIEncodeContext {
     VAEncMiscParameterRateControl rc_params;
     VAEncMiscParameterHRD        hrd_params;
     VAEncMiscParameterFrameRate   fr_params;
+    VAEncMiscParameterBufferMaxFrameSize mfs_params;
 #if VA_CHECK_VERSION(0, 36, 0)
     VAEncMiscParameterBufferQualityLevel quality_params;
 #endif
@@ -478,7 +482,11 @@ int ff_vaapi_encode_close(AVCodecContext *avctx);
       "Increase this to improve single channel performance. This option " \
       "doesn't work if driver doesn't implement vaSyncBuffer function.", \
       OFFSET(common.async_depth), AV_OPT_TYPE_INT, \
-      { .i64 = 2 }, 1, MAX_ASYNC_DEPTH, FLAGS }
+      { .i64 = 2 }, 1, MAX_ASYNC_DEPTH, FLAGS }, \
+    { "max_frame_size", \
+      "Maximum frame size (in bytes)",\
+      OFFSET(common.max_frame_size), AV_OPT_TYPE_INT, \
+      { .i64 = 0 }, 0, INT_MAX, FLAGS }
 
 #define VAAPI_ENCODE_RC_MODE(name, desc) \
     { #name, desc, 0, AV_OPT_TYPE_CONST, { .i64 = RC_MODE_ ## name }, \
-- 
2.25.1

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