[FFmpeg-devel] [PATCH V2] lavfi/showinfo: support regions of interest sidedata

[Jun Zhao]

From: Jun Zhao <barryjzhao at tencent.com>

support regions of interest sidedata

Signed-off-by: Jun Zhao <barryjzhao at tencent.com>
---
 libavfilter/vf_showinfo.c |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/libavfilter/vf_showinfo.c b/libavfilter/vf_showinfo.c
index e41c330..d0e140f 100644
--- a/libavfilter/vf_showinfo.c
+++ b/libavfilter/vf_showinfo.c
@@ -111,6 +111,36 @@ static void dump_stereo3d(AVFilterContext *ctx, AVFrameSideData *sd)
         av_log(ctx, AV_LOG_INFO, " (inverted)");
 }
 
+static void dump_roi(AVFilterContext *ctx, AVFrameSideData *sd)
+{
+    AVRegionOfInterest *roi;
+    int nb_rois;
+
+    if (sd->size < sizeof(*roi)) {
+        av_log(ctx, AV_LOG_INFO, "invalid data");
+        return;
+    }
+
+    roi = (AVRegionOfInterest *)sd->data;
+    if (roi->self_size == 0 || sd->size % roi->self_size != 0) {
+        av_log(ctx, AV_LOG_INFO, "invalid ROI side data");
+        return;
+    }
+    nb_rois = sd->size / roi->self_size;
+
+    av_log(ctx, AV_LOG_INFO, "Regions Of Interest(RoI) information: ");
+    for (int index = 0; index < nb_rois; index++) {
+        av_log(ctx, AV_LOG_INFO, "index: %d, region: (%d %d)/(%d %d), qp offset: %d/%d",
+               index, roi->left, roi->top, roi->right, roi->bottom, roi->qoffset.num, roi->qoffset.den);
+
+        if (roi->self_size == 0)
+            av_log(ctx, AV_LOG_INFO,
+                   "AVRegionOfInterest.self_size must be set to sizeof(AVRegionOfInterest).\n");
+
+        roi = (AVRegionOfInterest *)((char *)roi + roi->self_size);
+    }
+}
+
 static void dump_color_property(AVFilterContext *ctx, AVFrame *frame)
 {
     const char *color_range_str     = av_color_range_name(frame->color_range);
@@ -246,6 +276,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
         case AV_FRAME_DATA_AFD:
             av_log(ctx, AV_LOG_INFO, "afd: value of %"PRIu8, sd->data[0]);
             break;
+        case AV_FRAME_DATA_REGIONS_OF_INTEREST:
+            dump_roi(ctx, sd);
+            break;
         default:
             av_log(ctx, AV_LOG_WARNING, "unknown side data type %d (%d bytes)",
                    sd->type, sd->size);
-- 
1.7.1