Signed-off-by: Guo, Yejun <yejun....@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 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".