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lavu: add side data AV_FRAME_DATA_DETECTION_BBOXES for object detection/classification

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Guo, Yejun
2021-02-18 12:51:48 +08:00
parent 8b954a727a
commit f1bf465aa0
7 changed files with 192 additions and 1 deletions
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2
doc/APIchanges
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@@ -14,6 +14,8 @@ libavutil: 2017-10-21
API changes, most recent first:
2021-04-17 - xxxxxxxxxx - lavu 56.73.100 - frame.h detection_bbox.h
Add AV_FRAME_DATA_DETECTION_BBOXES
2021-04-06 - xxxxxxxxxx - lavf 58.78.100 - avformat.h
Add avformat_index_get_entries_count(), avformat_index_get_entry(),

2
libavutil/Makefile
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@@ -21,6 +21,7 @@ HEADERS = adler32.h \
cpu.h \
crc.h \
des.h \
detection_bbox.h \
dict.h \
display.h \
dovi_meta.h \
@@ -113,6 +114,7 @@ OBJS = adler32.o \
cpu.o \
crc.o \
des.o \
detection_bbox.o \
dict.o \
display.o \
dovi_meta.o \

73
libavutil/detection_bbox.c Normal file
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@@ -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 "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;
}

107
libavutil/detection_bbox.h Normal file
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@@ -0,0 +1,107 @@
/*
* 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

1
libavutil/frame.c
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@@ -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_DETECTION_BBOXES: return "Bounding boxes for object detection and classification";
}
return NULL;
}

6
libavutil/frame.h
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@@ -198,6 +198,12 @@ 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,
* as described by AVDetectionBBoxHeader.
*/
AV_FRAME_DATA_DETECTION_BBOXES,
};
enum AVActiveFormatDescription {

2
libavutil/version.h
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@@ -79,7 +79,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 56
#define LIBAVUTIL_VERSION_MINOR 72
#define LIBAVUTIL_VERSION_MINOR 73
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \