[FFmpeg-devel] [PATCH 1/4] avutil: add ambient viewing environment metadata side data
lance.lmwang at gmail.com
lance.lmwang at gmail.com
Mon Mar 28 02:25:10 EEST 2022
From: Limin Wang <lance.lmwang at gmail.com>
Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
---
libavutil/Makefile | 2 +
libavutil/ambient_viewing_env_metadata.c | 47 +++++++++++++++++++++
libavutil/ambient_viewing_env_metadata.h | 72 ++++++++++++++++++++++++++++++++
libavutil/frame.c | 1 +
libavutil/frame.h | 6 +++
5 files changed, 128 insertions(+)
create mode 100644 libavutil/ambient_viewing_env_metadata.c
create mode 100644 libavutil/ambient_viewing_env_metadata.h
diff --git a/libavutil/Makefile b/libavutil/Makefile
index 81df3b0..e388d33 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -26,6 +26,7 @@ HEADERS = adler32.h \
display.h \
dovi_meta.h \
downmix_info.h \
+ ambient_viewing_env_metadata.h \
encryption_info.h \
error.h \
eval.h \
@@ -119,6 +120,7 @@ OBJS = adler32.o \
display.o \
dovi_meta.o \
downmix_info.o \
+ ambient_viewing_env_metadata.o \
encryption_info.o \
error.o \
eval.o \
diff --git a/libavutil/ambient_viewing_env_metadata.c b/libavutil/ambient_viewing_env_metadata.c
new file mode 100644
index 0000000..7006b64
--- /dev/null
+++ b/libavutil/ambient_viewing_env_metadata.c
@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2022 Limin Wang <lance.lmwang at gmail.com>
+ *
+ * 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 <stdint.h>
+#include <string.h>
+#include "ambient_viewing_env_metadata.h"
+#include "mem.h"
+
+AVAmbientViewingEnvMetadata *av_ambient_viewing_env_metadata_alloc(size_t *size)
+{
+ AVAmbientViewingEnvMetadata *metadata = av_mallocz(sizeof(*metadata));
+
+ if (size)
+ *size = sizeof(*metadata);
+
+ return metadata;
+}
+
+AVAmbientViewingEnvMetadata *av_ambient_viewing_env_metadata_create_side_data(AVFrame *frame)
+{
+ AVFrameSideData *side_data = av_frame_new_side_data(frame,
+ AV_FRAME_DATA_AMBIENT_VIEWING_ENV,
+ sizeof(AVAmbientViewingEnvMetadata));
+ if (!side_data)
+ return NULL;
+
+ memset(side_data->data, 0, sizeof(AVAmbientViewingEnvMetadata));
+
+ return (AVAmbientViewingEnvMetadata *)side_data->data;
+}
diff --git a/libavutil/ambient_viewing_env_metadata.h b/libavutil/ambient_viewing_env_metadata.h
new file mode 100644
index 0000000..b0fbcd0
--- /dev/null
+++ b/libavutil/ambient_viewing_env_metadata.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2022 Limin Wang <lance.lmwang at gmail.com>
+ *
+ * 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_AMBIENT_VIEWING_ENV_METADATA_H
+#define AVUTIL_AMBIENT_VIEWING_ENV_METADATA_H
+
+#include "frame.h"
+
+
+/**
+ * The characteristics of the nominal ambient viewing environment for
+ * the display of the associated video content.
+ * To be used as payload of a AVFrameSideData the appropriate type.
+ *
+ * @note The struct should be allocated with av_ambient_viewing_env_metadata_alloc()
+ * and its size is not a part of the public ABI.
+ */
+typedef struct AVAmbientViewingEnvMetadata {
+ /**
+ * specifies the environmental illuminance of the ambient viewing
+ * environment in units of 0.0001 lux.
+ * ambient_illuminance shall not be equal to 0.
+ */
+ uint32_t ambient_illuminance;
+ /**
+ * specify the normalized x and y chromaticity coordinates, respectively,
+ * of the environmental ambient light in the nominal viewing environment,
+ * according to the CIE 1931 definition of x and y as specified in ISO
+ * 11664-1 (see also ISO 11664-3 and CIE 15), in normalized increments of
+ * 0.00002. The values of ambient_light_x and ambient_light_y shall be in
+ * the range of 0 to 50 000
+ */
+ uint16_t ambient_light_x;
+ uint16_t ambient_light_y;
+} AVAmbientViewingEnvMetadata;
+
+/**
+ * Allocate an AVAmbientViewingEnvMetadata structure and set its fields to
+ * default values. The resulting struct can be freed using av_freep().
+ *
+ * @return An AVAmbientViewingEnvMetadata filled with default values or NULL
+ * on failure.
+ */
+AVAmbientViewingEnvMetadata *av_ambient_viewing_env_metadata_alloc(size_t *size);
+
+/**
+ * Allocate a complete AVAmbientViewingEnvMetadata and add it to the frame.
+ *
+ * @param frame The frame which side data is added to.
+ *
+ * @return The AVAmbientViewingEnvMetadata structure to be filled by caller.
+ */
+AVAmbientViewingEnvMetadata *av_ambient_viewing_env_metadata_create_side_data(AVFrame *frame);
+
+#endif /* AVUTIL_AMBIENT_VIEWING_ENV_METADATA_H */
diff --git a/libavutil/frame.c b/libavutil/frame.c
index fbb869f..8882da2 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -815,6 +815,7 @@ const char *av_frame_side_data_name(enum AVFrameSideDataType type)
case AV_FRAME_DATA_DETECTION_BBOXES: return "Bounding boxes for object detection and classification";
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_ENV: return "Ambient Viewing Environment";
}
return NULL;
}
diff --git a/libavutil/frame.h b/libavutil/frame.h
index 33fac20..f7b1d4e 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -209,6 +209,12 @@ enum AVFrameSideDataType {
* volume transform - CUVA 005.1-2021.
*/
AV_FRAME_DATA_DYNAMIC_HDR_VIVID,
+
+ /**
+ * ambient viewing environment for a video frame, as described by
+ * the AVAmbientViewingEnvMetadata.
+ */
+ AV_FRAME_DATA_AMBIENT_VIEWING_ENV,
};
enum AVActiveFormatDescription {
--
1.8.3.1
More information about the ffmpeg-devel
mailing list