[FFmpeg-devel] [PATCH V7 4/6] lavu: add side data AV_FRAME_DATA_BOUNDING_BOXES
Guo, Yejun
yejun.guo at intel.com
Wed Apr 7 17:17:21 EEST 2021
Signed-off-by: Guo, Yejun <yejun.guo at intel.com>
---
doc/APIchanges | 2 +
libavutil/Makefile | 2 +
libavutil/boundingbox.c | 73 +++++++++++++++++++++++++
libavutil/boundingbox.h | 114 ++++++++++++++++++++++++++++++++++++++++
libavutil/frame.c | 1 +
libavutil/frame.h | 7 +++
6 files changed, 199 insertions(+)
create mode 100644 libavutil/boundingbox.c
create mode 100644 libavutil/boundingbox.h
diff --git a/doc/APIchanges b/doc/APIchanges
index 9dfcc97d5c..81d01aac1e 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -14,6 +14,8 @@ libavutil: 2017-10-21
API changes, most recent first:
+2021-04-xx - xxxxxxxxxx - lavu 56.xx.100 - frame.h boundingbox.h
+ Add AV_FRAME_DATA_BOUNDING_BOXES
2021-04-06 - xxxxxxxxxx - lavf 58.78.100 - avformat.h
Add avformat_index_get_entries_count(), avformat_index_get_entry(),
diff --git a/libavutil/Makefile b/libavutil/Makefile
index 27bafe9e12..f6d21bb5ce 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -11,6 +11,7 @@ HEADERS = adler32.h \
avutil.h \
base64.h \
blowfish.h \
+ boundingbox.h \
bprint.h \
bswap.h \
buffer.h \
@@ -104,6 +105,7 @@ OBJS = adler32.o \
avsscanf.o \
base64.o \
blowfish.o \
+ boundingbox.o \
bprint.o \
buffer.o \
cast5.o \
diff --git a/libavutil/boundingbox.c b/libavutil/boundingbox.c
new file mode 100644
index 0000000000..881661ec18
--- /dev/null
+++ b/libavutil/boundingbox.c
@@ -0,0 +1,73 @@
+/*
+ * 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 "boundingbox.h"
+
+AVBoundingBoxHeader *av_bbox_alloc(uint32_t nb_bboxes, size_t *out_size)
+{
+ size_t size;
+ struct {
+ AVBoundingBoxHeader header;
+ AVBoundingBox boxes[];
+ } *ret;
+
+ size = sizeof(*ret);
+ if (nb_bboxes > (SIZE_MAX - size) / sizeof(*ret->boxes))
+ return NULL;
+ size += sizeof(*ret->boxes) * nb_bboxes;
+
+ ret = av_mallocz(size);
+ if (!ret)
+ return NULL;
+
+ ret->header.nb_bboxes = nb_bboxes;
+ ret->header.bbox_size = sizeof(*ret->boxes);
+ ret->header.bboxes_offset = (char *)&ret->boxes - (char *)&ret->header;
+
+ if (out_size)
+ *out_size = sizeof(*ret);
+
+ return &ret->header;
+}
+
+AVBoundingBoxHeader* av_bbox_create_side_data(AVFrame *frame, uint32_t nb_bboxes)
+{
+ AVBufferRef *buf;
+ AVBoundingBoxHeader *header;
+ size_t size;
+
+ header = av_bbox_alloc(nb_bboxes, &size);
+ if (!header)
+ return NULL;
+ if (size > INT_MAX) {
+ av_freep(&header);
+ return NULL;
+ }
+ buf = av_buffer_create((uint8_t *)header, size, NULL, NULL, 0);
+ if (!buf) {
+ av_freep(&header);
+ return NULL;
+ }
+
+ if (!av_frame_new_side_data_from_buf(frame, AV_FRAME_DATA_BOUNDING_BOXES, buf)) {
+ av_buffer_unref(&buf);
+ return NULL;
+ }
+
+ return header;
+}
diff --git a/libavutil/boundingbox.h b/libavutil/boundingbox.h
new file mode 100644
index 0000000000..2b77c6c0dc
--- /dev/null
+++ b/libavutil/boundingbox.h
@@ -0,0 +1,114 @@
+/*
+ * 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_BOUNDINGBOX_H
+#define AVUTIL_BOUNDINGBOX_H
+
+#include "rational.h"
+#include "avassert.h"
+#include "frame.h"
+
+typedef struct AVBoundingBox {
+ /**
+ * Distance in pixels from the top edge of the frame to top
+ * and bottom, and from the left edge of the frame to left and
+ * right, defining the bounding box.
+ */
+ int top;
+ int left;
+ int bottom;
+ int right;
+
+#define AV_BBOX_LABEL_NAME_MAX_SIZE 32
+
+ /**
+ * Detect result with confidence
+ */
+ char detect_label[AV_BBOX_LABEL_NAME_MAX_SIZE];
+ AVRational detect_confidence;
+
+ /**
+ * At most 4 classifications based on the detected bounding box.
+ * For example, we can get max 4 different attributes with 4 different
+ * DNN models on one bounding box.
+ * classify_count is zero if no classification.
+ */
+#define AV_NUM_BBOX_CLASSIFY 4
+ uint32_t classify_count;
+ char classify_labels[AV_NUM_BBOX_CLASSIFY][AV_BBOX_LABEL_NAME_MAX_SIZE];
+ AVRational classify_confidences[AV_NUM_BBOX_CLASSIFY];
+} AVBoundingBox;
+
+typedef struct AVBoundingBoxHeader {
+ /**
+ * Information about how the bounding box is generated.
+ * for example, the DNN model name.
+ */
+ char source[128];
+
+ /**
+ * The size of frame when it is detected.
+ */
+ int frame_width;
+ int frame_height;
+
+ /**
+ * Number of bounding boxes in the array.
+ */
+ uint32_t nb_bboxes;
+
+ /**
+ * Offset in bytes from the beginning of this structure at which
+ * the array of bounding boxes starts.
+ */
+ size_t bboxes_offset;
+
+ /**
+ * Size of each bounding box in bytes.
+ */
+ size_t bbox_size;
+} AVBoundingBoxHeader;
+
+/*
+ * Get the bounding box at the specified {@code idx}. Must be between 0 and nb_bboxes.
+ */
+static av_always_inline AVBoundingBox*
+av_get_bounding_box(const AVBoundingBoxHeader *header, unsigned int idx)
+{
+ av_assert0(idx < header->nb_bboxes);
+ return (AVBoundingBox *)((uint8_t *)header + header->bboxes_offset +
+ idx * header->bbox_size);
+}
+
+/**
+ * Allocates memory for AVBoundingBoxHeader, plus an array of {@code nb_bboxes}
+ * AVBoundingBox, and initializes the variables.
+ * Can be freed with a normal av_free() call.
+ *
+ * @param out_size if non-NULL, the size in bytes of the resulting data array is
+ * written here.
+ */
+AVBoundingBoxHeader *av_bbox_alloc(uint32_t nb_bboxes, size_t *out_size);
+
+/**
+ * Allocates memory for AVBoundingBoxHeader, plus an array of {@code nb_bboxes}
+ * AVBoundingBox, in the given AVFrame {@code frame} as AVFrameSideData of type
+ * AV_FRAME_DATA_BOUNDING_BOXES and initializes the variables.
+ */
+AVBoundingBoxHeader* av_bbox_create_side_data(AVFrame *frame, uint32_t nb_bboxes);
+#endif
diff --git a/libavutil/frame.c b/libavutil/frame.c
index fefb2b69c0..d8e86263af 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -853,6 +853,7 @@ const char *av_frame_side_data_name(enum AVFrameSideDataType type)
case AV_FRAME_DATA_VIDEO_ENC_PARAMS: return "Video encoding parameters";
case AV_FRAME_DATA_SEI_UNREGISTERED: return "H.26[45] User Data Unregistered SEI message";
case AV_FRAME_DATA_FILM_GRAIN_PARAMS: return "Film grain parameters";
+ case AV_FRAME_DATA_BOUNDING_BOXES: return "Bounding boxes";
}
return NULL;
}
diff --git a/libavutil/frame.h b/libavutil/frame.h
index a5ed91b20a..41e22de02a 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -198,6 +198,13 @@ enum AVFrameSideDataType {
* Must be present for every frame which should have film grain applied.
*/
AV_FRAME_DATA_FILM_GRAIN_PARAMS,
+
+ /**
+ * Bounding boxes for object detection and classification, the data is a AVBoundingBoxHeader
+ * followed with an array of AVBoudingBox, and AVBoundingBoxHeader.nb_bboxes is the number
+ * of array element.
+ */
+ AV_FRAME_DATA_BOUNDING_BOXES,
};
enum AVActiveFormatDescription {
--
2.17.1
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