> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of Ting
> Fu
> Sent: 2021年5月14日 16:47
> To: ffmpeg-devel@ffmpeg.org
> Subject: [FFmpeg-devel] [PATCH 3/3] libavfilter: vf_drawtext filter support
> draw text with detection bounding boxes in side_data
>
> This feature can be used with dnn detection by setting vf_drawtext's option
> text_source=side_data_detection_bboxes, for example:
> ./ffmpeg -i face.jpeg -vf
> dnn_detect=dnn_backend=openvino:model=face-detection-adas-0001.xml:\
> input=data:output=detection_out:labels=face-detection-adas-0001.label,dra
> wbox=box_source=
> side_data_detection_bboxes,drawtext=text_source=side_data_detection_bbo
> xes:fontcolor=green:\
> fontsize=40, -y face_detect.jpeg
> Please note, the default fontsize of vf_drawtext is 12, which may be too
> small to be seen clearly.
>
> Signed-off-by: Ting Fu <ting...@intel.com>
> ---
> doc/filters.texi | 8 ++++
> libavfilter/vf_drawtext.c | 77
> ++++++++++++++++++++++++++++++++++++---
> 2 files changed, 79 insertions(+), 6 deletions(-)
>
> diff --git a/doc/filters.texi b/doc/filters.texi
> index f2ac8c4cc8..d10e6de03d 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -10788,6 +10788,14 @@ parameter @var{text}.
>
> If both @var{text} and @var{textfile} are specified, an error is thrown.
>
> +@item text_source
> +Text source should be set as side_data_detection_bboxes if you want to use
> text data in
> +detection bboxes of side data.
> +
> +If text source is set, @var{text} and @var{textfile} will be ignored and
> still
> use
> +text data in detection bboxes of side data. So please do not use this
> parameter
> +if you are not sure about the text source.
> +
> @item reload
> If set to 1, the @var{textfile} will be reloaded before each frame.
> Be sure to update it atomically, or it may be read partially, or even fail.
> diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
> index 7ea057b812..382d589e26 100644
> --- a/libavfilter/vf_drawtext.c
> +++ b/libavfilter/vf_drawtext.c
> @@ -55,6 +55,7 @@
> #include "libavutil/time_internal.h"
> #include "libavutil/tree.h"
> #include "libavutil/lfg.h"
> +#include "libavutil/detection_bbox.h"
> #include "avfilter.h"
> #include "drawutils.h"
> #include "formats.h"
> @@ -199,6 +200,8 @@ typedef struct DrawTextContext {
> int tc24hmax; ///< 1 if timecode is wrapped to 24
> hours, 0 otherwise
> int reload; ///< reload text file for each frame
> int start_number; ///< starting frame number for
> n/frame_num var
> + char *text_source_string; ///< the string to specify text data
> source
> + enum AVFrameSideDataType text_source;
> #if CONFIG_LIBFRIBIDI
> int text_shaping; ///< 1 to shape the text before
> drawing it
> #endif
> @@ -246,6 +249,7 @@ static const AVOption drawtext_options[]= {
> { "alpha", "apply alpha while rendering", OFFSET(a_expr),
> AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
> {"fix_bounds", "check and fix text coords to avoid clipping",
> OFFSET(fix_bounds), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
> {"start_number", "start frame number for n/frame_num variable",
> OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
> + {"text_source", "the source of text", OFFSET(text_source_string),
> AV_OPT_TYPE_STRING, {.str=NULL}, 0, 1, FLAGS },
>
> #if CONFIG_LIBFRIBIDI
> {"text_shaping", "attempt to shape text before drawing",
> OFFSET(text_shaping), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS},
> @@ -690,6 +694,16 @@ out:
> }
> #endif
>
> +static enum AVFrameSideDataType text_source_string_parse(const char
> *text_source_string)
> +{
> + av_assert0(text_source_string);
> + if (!strcmp(text_source_string, "side_data_detection_bboxes")) {
> + return AV_FRAME_DATA_DETECTION_BBOXES;
> + } else {
> + return AVERROR(EINVAL);
> + }
> +}
> +
> static av_cold int init(AVFilterContext *ctx)
> {
> int err;
> @@ -731,9 +745,28 @@ static av_cold int init(AVFilterContext *ctx)
> s->text = av_strdup("");
> }
>
> + if (s->text_source_string) {
> + s->text_source = text_source_string_parse(s->text_source_string);
> + if ((int)s->text_source < 0) {
> + av_log(ctx, AV_LOG_ERROR, "Error text source: %s\n",
> s->text_source_string);
> + return AVERROR(EINVAL);
> + }
> + }
> +
> + if (s->text_source == AV_FRAME_DATA_DETECTION_BBOXES) {
> + if (s->text) {
> + av_log(ctx, AV_LOG_WARNING, "Multiple texts provided, will
> use text_source only\n");
> + av_free(s->text);
> + }
> + s->text =
> av_mallocz(AV_DETECTION_BBOX_LABEL_NAME_MAX_SIZE *
> + (AV_NUM_DETECTION_BBOX_CLASSIFY +
> 1));
> + if (!s->text)
> + return AVERROR(ENOMEM);
> + }
> +
> if (!s->text) {
> av_log(ctx, AV_LOG_ERROR,
> - "Either text, a valid file or a timecode must be
> provided\n");
> + "Either text, a valid file, a timecode or text source must be
> provided\n");
> return AVERROR(EINVAL);
> }
>
> @@ -1440,10 +1473,15 @@ continue_on_invalid2:
>
> s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;
>
> - s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values,
> &s->prng);
> - s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values,
> &s->prng);
> - /* It is necessary if x is expressed from y */
> - s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values,
> &s->prng);
> + if (s->text_source == AV_FRAME_DATA_DETECTION_BBOXES) {
> + s->var_values[VAR_X] = s->x;
> + s->var_values[VAR_Y] = s->y;
> + } else {
> + s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr,
> s->var_values, &s->prng);
> + s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr,
> s->var_values, &s->prng);
> + /* It is necessary if x is expressed from y */
> + s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr,
> s->var_values, &s->prng);
> + }
>
> update_alpha(s);
> update_color_with_alpha(s, &fontcolor , s->fontcolor );
> @@ -1511,6 +1549,21 @@ static int filter_frame(AVFilterLink *inlink,
> AVFrame *frame)
> AVFilterLink *outlink = ctx->outputs[0];
> DrawTextContext *s = ctx->priv;
> int ret;
> + const AVDetectionBBoxHeader *header = NULL;
> + const AVDetectionBBox *bbox;
> + AVFrameSideData *sd;
> + int loop = 1;
> +
> + if (s->text_source == AV_FRAME_DATA_DETECTION_BBOXES && sd) {
> + sd = av_frame_get_side_data(frame,
> AV_FRAME_DATA_DETECTION_BBOXES);
> + if (sd) {
> + header = (AVDetectionBBoxHeader *)sd->data;
> + loop = header->nb_bboxes;
> + } else {
> + av_log(s, AV_LOG_WARNING, "No detection bboxes.\n");
> + return ff_filter_frame(outlink, frame);
> + }
> + }
>
> if (s->reload) {
> if ((ret = load_textfile(ctx)) < 0) {
> @@ -1536,7 +1589,19 @@ static int filter_frame(AVFilterLink *inlink,
> AVFrame *frame)
> s->var_values[VAR_PKT_SIZE] = frame->pkt_size;
> s->metadata = frame->metadata;
>
> - draw_text(ctx, frame, frame->width, frame->height);
> + for (int i = 0; i < loop; i++) {
> + if (header) {
> + bbox = av_get_detection_bbox(header, i);
> + strcpy(s->text, bbox->detect_label);
> + for (int j = 0; j < bbox->classify_count; j++) {
> + strcat(s->text, ", ");
> + strcat(s->text, bbox->classify_labels[j]);
> + }
> + s->x = bbox->x;
> + s->y = bbox->y - s->fontsize;
> + }
> + draw_text(ctx, frame, frame->width, frame->height);
> + }
>
> av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d
> y:%d\n",
> (int)s->var_values[VAR_N], s->var_values[VAR_T],
> --
any comment? thanks.
A new option is added into vf_drawbox and vf_drawtext to visualize the
data from detection bounding boxes in the side data of AVFrame.
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