vaapi_encode: Add ROI support

libavcodec/vaapi_encode.c

@@ -166,6 +166,7 @@ static int vaapi_encode_issue(AVCodecContext *avctx,
     int err, i;
     char data[MAX_PARAM_BUFFER_SIZE];
     size_t bit_len;
+    av_unused AVFrameSideData *sd;
 
     av_log(avctx, AV_LOG_DEBUG, "Issuing encode for pic %"PRId64"/%"PRId64" "
            "as type %s.\n", pic->display_order, pic->encode_order,
@@ -435,6 +436,71 @@ static int vaapi_encode_issue(AVCodecContext *avctx,
         }
     }
 
+#if VA_CHECK_VERSION(1, 0, 0)
+    sd = av_frame_get_side_data(pic->input_image,
+                                AV_FRAME_DATA_REGIONS_OF_INTEREST);
+    if (sd && ctx->roi_allowed) {
+        const AVRegionOfInterest *roi;
+        uint32_t roi_size;
+        VAEncMiscParameterBufferROI param_roi;
+        int nb_roi, i, v;
+
+        roi = (const AVRegionOfInterest*)sd->data;
+        roi_size = roi->self_size;
+        av_assert0(roi_size && sd->size % roi_size == 0);
+        nb_roi = sd->size / roi_size;
+        if (nb_roi > ctx->roi_max_regions) {
+            if (!ctx->roi_warned) {
+                av_log(avctx, AV_LOG_WARNING, "More ROIs set than "
+                       "supported by driver (%d > %d).\n",
+                       nb_roi, ctx->roi_max_regions);
+                ctx->roi_warned = 1;
+            }
+            nb_roi = ctx->roi_max_regions;
+        }
+
+        pic->roi = av_mallocz_array(nb_roi, sizeof(*pic->roi));
+        if (!pic->roi) {
+            err = AVERROR(ENOMEM);
+            goto fail;
+        }
+        // For overlapping regions, the first in the array takes priority.
+        for (i = 0; i < nb_roi; i++) {
+            roi = (const AVRegionOfInterest*)(sd->data + roi_size * i);
+
+            av_assert0(roi->qoffset.den != 0);
+            v = roi->qoffset.num * ctx->roi_quant_range / roi->qoffset.den;
+            av_log(avctx, AV_LOG_DEBUG, "ROI: (%d,%d)-(%d,%d) -> %+d.\n",
+                   roi->top, roi->left, roi->bottom, roi->right, v);
+
+            pic->roi[i] = (VAEncROI) {
+                .roi_rectangle = {
+                    .x      = roi->left,
+                    .y      = roi->top,
+                    .width  = roi->right  - roi->left,
+                    .height = roi->bottom - roi->top,
+                },
+                .roi_value = av_clip_c(v, INT8_MIN, INT8_MAX),
+            };
+        }
+
+        param_roi = (VAEncMiscParameterBufferROI) {
+            .num_roi      = nb_roi,
+            .max_delta_qp = INT8_MAX,
+            .min_delta_qp = INT8_MIN,
+            .roi          = pic->roi,
+            .roi_flags.bits.roi_value_is_qp_delta = 1,
+        };
+
+        err = vaapi_encode_make_misc_param_buffer(avctx, pic,
+                                                  VAEncMiscParameterTypeROI,
+                                                  &param_roi,
+                                                  sizeof(param_roi));
+        if (err < 0)
+            goto fail;
+    }
+#endif
+
     vas = vaBeginPicture(ctx->hwctx->display, ctx->va_context,
                          pic->input_surface);
     if (vas != VA_STATUS_SUCCESS) {
@@ -500,6 +566,7 @@ fail_at_end:
     av_freep(&pic->codec_picture_params);
     av_freep(&pic->param_buffers);
     av_freep(&pic->slices);
+    av_freep(&pic->roi);
     av_frame_free(&pic->recon_image);
     av_buffer_unref(&pic->output_buffer_ref);
     pic->output_buffer = VA_INVALID_ID;
@@ -634,6 +701,7 @@ static int vaapi_encode_free(AVCodecContext *avctx,
 
     av_freep(&pic->priv_data);
     av_freep(&pic->codec_picture_params);
+    av_freep(&pic->roi);
 
     av_free(pic);
 
@@ -948,6 +1016,17 @@ static int vaapi_encode_check_frame(AVCodecContext *avctx,
         ctx->crop_warned = 1;
     }
 
+    if (!ctx->roi_allowed) {
+        AVFrameSideData *sd =
+            av_frame_get_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
+
+        if (sd && !ctx->roi_warned) {
+            av_log(avctx, AV_LOG_WARNING, "ROI side data on input "
+                   "frames ignored due to lack of driver support.\n");
+            ctx->roi_warned = 1;
+        }
+    }
+
     return 0;
 }
 
@@ -1942,6 +2021,39 @@ static av_cold int vaapi_encode_init_quality(AVCodecContext *avctx)
     return 0;
 }
 
+static av_cold int vaapi_encode_init_roi(AVCodecContext *avctx)
+{
+#if VA_CHECK_VERSION(1, 0, 0)
+    VAAPIEncodeContext *ctx = avctx->priv_data;
+    VAStatus vas;
+    VAConfigAttrib attr = { VAConfigAttribEncROI };
+
+    vas = vaGetConfigAttributes(ctx->hwctx->display,
+                                ctx->va_profile,
+                                ctx->va_entrypoint,
+                                &attr, 1);
+    if (vas != VA_STATUS_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to query ROI "
+               "config attribute: %d (%s).\n", vas, vaErrorStr(vas));
+        return AVERROR_EXTERNAL;
+    }
+
+    if (attr.value == VA_ATTRIB_NOT_SUPPORTED) {
+        ctx->roi_allowed = 0;
+    } else {
+        VAConfigAttribValEncROI roi = {
+            .value = attr.value,
+        };
+
+        ctx->roi_max_regions = roi.bits.num_roi_regions;
+        ctx->roi_allowed = ctx->roi_max_regions > 0 &&
+            (ctx->va_rc_mode == VA_RC_CQP ||
+             roi.bits.roi_rc_qp_delta_support);
+    }
+#endif
+    return 0;
+}
+
 static void vaapi_encode_free_output_buffer(void *opaque,
                                             uint8_t *data)
 {
@@ -2132,6 +2244,10 @@ av_cold int ff_vaapi_encode_init(AVCodecContext *avctx)
     if (err < 0)
         goto fail;
 
+    err = vaapi_encode_init_roi(avctx);
+    if (err < 0)
+        goto fail;
+
     if (avctx->compression_level >= 0) {
         err = vaapi_encode_init_quality(avctx);
         if (err < 0)

libavcodec/vaapi_encode.h

@@ -69,6 +69,13 @@ typedef struct VAAPIEncodePicture {
     int64_t         pts;
     int             force_idr;
 
+#if VA_CHECK_VERSION(1, 0, 0)
+    // ROI regions.
+    VAEncROI       *roi;
+#else
+    void           *roi;
+#endif
+
     int             type;
     int             b_depth;
     int             encode_issued;
@@ -304,9 +311,20 @@ typedef struct VAAPIEncodeContext {
     int gop_counter;
     int end_of_stream;
 
+    // Whether the driver supports ROI at all.
+    int             roi_allowed;
+    // Maximum number of regions supported by the driver.
+    int             roi_max_regions;
+    // Quantisation range for offset calculations.  Set by codec-specific
+    // code, as it may change based on parameters.
+    int             roi_quant_range;
+
     // The encoder does not support cropping information, so warn about
     // it the first time we encounter any nonzero crop fields.
     int             crop_warned;
+    // If the driver does not support ROI then warn the first time we
+    // encounter a frame with ROI side data.
+    int             roi_warned;
 } VAAPIEncodeContext;
 
 enum {

libavcodec/vaapi_encode_h264.c

@@ -1130,6 +1130,8 @@ static av_cold int vaapi_encode_h264_configure(AVCodecContext *avctx)
         }
     }
 
+    ctx->roi_quant_range = 51 + 6 * (ctx->profile->depth - 8);
+
     return 0;
 }
 

libavcodec/vaapi_encode_h265.c

@@ -1102,6 +1102,8 @@ static av_cold int vaapi_encode_h265_configure(AVCodecContext *avctx)
         priv->fixed_qp_b   = 30;
     }
 
+    ctx->roi_quant_range = 51 + 6 * (ctx->profile->depth - 8);
+
     return 0;
 }
 

libavcodec/vaapi_encode_mpeg2.c

@@ -552,6 +552,8 @@ static av_cold int vaapi_encode_mpeg2_configure(AVCodecContext *avctx)
     ctx->nb_slices  = ctx->slice_block_rows;
     ctx->slice_size = 1;
 
+    ctx->roi_quant_range = 31;
+
     return 0;
 }
 

libavcodec/vaapi_encode_vp8.c

@@ -173,6 +173,8 @@ static av_cold int vaapi_encode_vp8_configure(AVCodecContext *avctx)
     else
         priv->q_index_i = priv->q_index_p;
 
+    ctx->roi_quant_range = VP8_MAX_QUANT;
+
     return 0;
 }
 

libavcodec/vaapi_encode_vp9.c

@@ -202,6 +202,8 @@ static av_cold int vaapi_encode_vp9_configure(AVCodecContext *avctx)
         priv->q_idx_idr = priv->q_idx_p = priv->q_idx_b = 100;
     }
 
+    ctx->roi_quant_range = VP9_MAX_QUANT;
+
     return 0;
 }