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/*
* 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
*/
/**
* @file QR decoder video filter
*
* Use libquirc library to decode the content of QR codes, and put the decoded
* content to metadata. See:
* https://github.com/dlbeer/quirc
*/
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "video.h"
#include <quirc.h>
typedef struct QuircContext {
const AVClass *class;
struct quirc *quirc;
} QuircContext;
static av_cold int init(AVFilterContext *ctx)
{
QuircContext *quirc = ctx->priv;
quirc->quirc = quirc_new();
if (!quirc->quirc) {
return AVERROR(ENOMEM);
}
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
QuircContext *quirc = ctx->priv;
quirc_destroy(quirc->quirc);
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
QuircContext *quirc = ctx->priv;
int err;
err = quirc_resize(quirc->quirc, inlink->w, inlink->h);
if (err == -1) {
return AVERROR(ENOMEM);
}
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
QuircContext *quirc = ctx->priv;
int codes_count;
uint8_t *image;
/* copy input image to quirc buffer */
image = quirc_begin(quirc->quirc, NULL, NULL);
av_image_copy_plane(image, inlink->w,
frame->data[0], frame->linesize[0], inlink->w, inlink->h);
quirc_end(quirc->quirc);
codes_count = quirc_count(quirc->quirc);
av_log(ctx, AV_LOG_VERBOSE,
"Found count %d codes in image #%ld\n", codes_count, inlink->frame_count_out);
if (codes_count) {
int i, j;
AVDictionary **metadata = &frame->metadata;
av_dict_set_int(metadata, "lavfi.quirc.count", codes_count, 0);
for (i = 0; i < codes_count; i++) {
struct quirc_code code;
struct quirc_data data;
quirc_decode_error_t err;
char metadata_key[64];
quirc_extract(quirc->quirc, i, &code);
err = quirc_decode(&code, &data);
if (err) {
av_log(ctx, AV_LOG_WARNING,
"Failed to decode image: %s\n", quirc_strerror(err));
continue;
}
for (j = 0; j < 4; j++) {
struct quirc_point corner = code.corners[j];
#define SET_CORNER_METADATA(key_, value_) \
snprintf(metadata_key, sizeof(metadata_key)-1, \
"lavfi.quirc.%d.corner.%d." #key_, i, j); \
av_dict_set_int(metadata, metadata_key, value_, 0)
SET_CORNER_METADATA(x, corner.x);
SET_CORNER_METADATA(y, corner.y);
}
snprintf(metadata_key, sizeof(metadata_key)-1, "lavfi.quirc.%d.payload", i); \
av_dict_set(metadata, metadata_key, data.payload, 0);
av_log(ctx, AV_LOG_INFO,
"Found QR code at position %d,%d - %d,%d with payload: %s\n",
code.corners[0].x, code.corners[0].y,
code.corners[3].x, code.corners[3].y, data.payload);
}
}
return ff_filter_frame(outlink, frame);
}
static const AVClass quirc_class = {
.class_name = "quirc",
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_FILTER
};
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input
},
};
const AVFilter ff_vf_quirc = {
.name = "quirc",
.description = NULL_IF_CONFIG_SMALL("Decode and show QR codes content."),
.priv_size = sizeof(QuircContext),
.priv_class = &quirc_class,
.init = init,
.uninit = uninit,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
AVFILTER_FLAG_METADATA_ONLY,
};
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