--- /dev/null
+/*
+ * 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 "detection_bbox.h"
+
+AVDetectionBBoxHeader *av_detection_bbox_alloc(uint32_t nb_bboxes, size_t *out_size)
+{
+ size_t size;
+ struct {
+ AVDetectionBBoxHeader header;
+ AVDetectionBBox boxes[1];
+ } *ret;
+
+ size = sizeof(*ret);
+ if (nb_bboxes - 1 > (SIZE_MAX - size) / sizeof(*ret->boxes))
+ return NULL;
+ size += sizeof(*ret->boxes) * (nb_bboxes - 1);
+
+ 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 = size;
+
+ return &ret->header;
+}
+
+AVDetectionBBoxHeader *av_detection_bbox_create_side_data(AVFrame *frame, uint32_t nb_bboxes)
+{
+ AVBufferRef *buf;
+ AVDetectionBBoxHeader *header;
+ size_t size;
+
+ header = av_detection_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_DETECTION_BBOXES, buf)) {
+ av_buffer_unref(&buf);
+ return NULL;
+ }
+
+ return header;
+}
--- /dev/null
+/*
+ * 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_DETECTION_BBOX_H
+#define AVUTIL_DETECTION_BBOX_H
+
+#include "rational.h"
+#include "avassert.h"
+#include "frame.h"
+
+typedef struct AVDetectionBBox {
+ /**
+ * Distance in pixels from the left/top edge of the frame,
+ * together with width and height, defining the bounding box.
+ */
+ int x;
+ int y;
+ int w;
+ int h;
+
+#define AV_DETECTION_BBOX_LABEL_NAME_MAX_SIZE 64
+
+ /**
+ * Detect result with confidence
+ */
+ char detect_label[AV_DETECTION_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_DETECTION_BBOX_LABEL_NAME_MAX_SIZE];
+ AVRational classify_confidences[AV_NUM_BBOX_CLASSIFY];
+} AVDetectionBBox;
+
+typedef struct AVDetectionBBoxHeader {
+ /**
+ * Information about how the bounding box is generated.
+ * for example, the DNN model name.
+ */
+ char source[256];
+
+ /**
+ * 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;
+} AVDetectionBBoxHeader;
+
+/*
+ * Get the bounding box at the specified {@code idx}. Must be between 0 and nb_bboxes.
+ */
+static av_always_inline AVDetectionBBox*
+av_get_detection_bbox(const AVDetectionBBoxHeader *header, unsigned int idx)
+{
+ av_assert0(idx < header->nb_bboxes);
+ return (AVDetectionBBox *)((uint8_t *)header + header->bboxes_offset +
+ idx * header->bbox_size);
+}
+
+/**
+ * Allocates memory for AVDetectionBBoxHeader, plus an array of {@code nb_bboxes}
+ * AVDetectionBBox, 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.
+ */
+AVDetectionBBoxHeader *av_detection_bbox_alloc(uint32_t nb_bboxes, size_t *out_size);
+
+/**
+ * Allocates memory for AVDetectionBBoxHeader, plus an array of {@code nb_bboxes}
+ * AVDetectionBBox, in the given AVFrame {@code frame} as AVFrameSideData of type
+ * AV_FRAME_DATA_DETECTION_BBOXES and initializes the variables.
+ */
+AVDetectionBBoxHeader *av_detection_bbox_create_side_data(AVFrame *frame, uint32_t nb_bboxes);
+#endif
projects / ffmpeg / commitdiff