[FFmpeg-devel] [PATCH 1/7] lavu: add ecinfo sidedata

["J. Dekker" <jdek@itanimul.li>]

Add sidedata for passing basic Error Concealment information helpful to
a renderer or end user attempting to filter or conceal video decoding
errors and artifacts.

Co-Authored-By: Thomas Guillem <thomas@gllm.fr>
Signed-off-by: J. Dekker <jdek@itanimul.li>
---
 libavutil/Makefile  |  2 ++
 libavutil/ec.c      | 42 +++++++++++++++++++++++++++++
 libavutil/ec.h      | 66 +++++++++++++++++++++++++++++++++++++++++++++
 libavutil/frame.c   |  1 +
 libavutil/frame.h   |  6 +++++
 libavutil/version.h |  2 +-
 6 files changed, 118 insertions(+), 1 deletion(-)
 create mode 100644 libavutil/ec.c
 create mode 100644 libavutil/ec.h

diff --git a/libavutil/Makefile b/libavutil/Makefile
index bd9c6f9e32..81b6b1fb8a 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -28,6 +28,7 @@ HEADERS = adler32.h                                                     \
           display.h                                                     \
           dovi_meta.h                                                   \
           downmix_info.h                                                \
+          ec.h                                                          \
           encryption_info.h                                             \
           error.h                                                       \
           eval.h                                                        \
@@ -124,6 +125,7 @@ OBJS = adler32.o                                                        \
        dovi_meta.o                                                      \
        downmix_info.o                                                   \
        encryption_info.o                                                \
+       ec.o                                                             \
        error.o                                                          \
        eval.o                                                           \
        fifo.o                                                           \
diff --git a/libavutil/ec.c b/libavutil/ec.c
new file mode 100644
index 0000000000..762accd0a6
--- /dev/null
+++ b/libavutil/ec.c
@@ -0,0 +1,42 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+#include "ec.h"
+
+AVECInfo *av_eci_create_side_data(AVFrame *f)
+{
+    AVBufferRef *buf = NULL;
+    AVECInfo *eci = av_mallocz(sizeof(AVECInfo));
+
+    if (!eci)
+        return NULL;
+
+    buf = av_buffer_create((uint8_t *)eci, sizeof(AVECInfo), NULL, NULL, 0);
+    if (!buf) {
+        av_freep(&eci);
+        return NULL;
+    }
+
+    if (!av_frame_new_side_data_from_buf(f, AV_FRAME_DATA_EC_INFO, buf)) {
+        av_buffer_unref(&buf);
+        return NULL;
+    }
+
+    return eci;
+}
diff --git a/libavutil/ec.h b/libavutil/ec.h
new file mode 100644
index 0000000000..439fe876a2
--- /dev/null
+++ b/libavutil/ec.h
@@ -0,0 +1,66 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVUTIL_EC_H
+#define AVUTIL_EC_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "libavutil/mem.h"
+#include "libavutil/frame.h"
+
+/**
+ * Error Concealment information helpful to a renderer or end user
+ * attempting to filter or conceal video decoding errors and artifacts.
+ */
+typedef struct AVECInfo {
+    /**
+     * Integer estimating how many pixels of the video frame had decoding
+     * errors.
+     */
+    uint64_t error;
+    /**
+     * Integer estimating how many pixels of the video frame decoded
+     * without error.
+     */
+    uint64_t ok;
+    /**
+     * Integer estimating how many pixels of the video frame's reference
+     * frames had decoding errors.
+     */
+    uint64_t ref_error;
+    /**
+     * Integer estimating how many pixels of the video frame's reference
+     * frames decoded without error.
+     */
+    uint64_t ref_ok;
+} AVECInfo;
+
+static inline void av_eci_reset(AVECInfo *info)
+{
+    info->error = info->ok = info->ref_error = info->ref_ok = 0;
+}
+
+/**
+ * Creates AVECInfo in a specified frame as side data.
+ */
+AVECInfo *av_eci_create_side_data(AVFrame *f);
+
+#endif /* AVUTIL_EC_H */
diff --git a/libavutil/frame.c b/libavutil/frame.c
index b6cee2d886..30a838bf22 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -960,6 +960,7 @@ const char *av_frame_side_data_name(enum AVFrameSideDataType type)
     case AV_FRAME_DATA_DOVI_RPU_BUFFER:             return "Dolby Vision RPU Data";
     case AV_FRAME_DATA_DOVI_METADATA:               return "Dolby Vision Metadata";
     case AV_FRAME_DATA_AMBIENT_VIEWING_ENVIRONMENT: return "Ambient viewing environment";
+    case AV_FRAME_DATA_EC_INFO: return "Error Concealment Information";
     }
     return NULL;
 }
diff --git a/libavutil/frame.h b/libavutil/frame.h
index a491315f25..08c6b96d29 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -214,6 +214,12 @@ enum AVFrameSideDataType {
      * Ambient viewing environment metadata, as defined by H.274.
      */
     AV_FRAME_DATA_AMBIENT_VIEWING_ENVIRONMENT,
+    /**
+     * Error Concealment Information helpful to a renderer attempting to filter
+     * or conceal video decoding errors and artifacts. See AVECInfo defined in
+     * libavutil/error.h.
+     */
+    AV_FRAME_DATA_EC_INFO,
 };
 
 enum AVActiveFormatDescription {
diff --git a/libavutil/version.h b/libavutil/version.h
index 24af520e08..9e798b0e3f 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -79,7 +79,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  58
-#define LIBAVUTIL_VERSION_MINOR  14
+#define LIBAVUTIL_VERSION_MINOR  15
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
-- 
2.41.0

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