lavfi: add quirc filter

3 files changed, 185 insertions, 0 deletions

diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 31371ceb1a..f65fb9a5a7 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -437,6 +437,7 @@ OBJS-$(CONFIG_PSEUDOCOLOR_FILTER)            += vf_pseudocolor.o
 OBJS-$(CONFIG_PSNR_FILTER)                   += vf_psnr.o framesync.o
 OBJS-$(CONFIG_PULLUP_FILTER)                 += vf_pullup.o
 OBJS-$(CONFIG_QP_FILTER)                     += vf_qp.o
+OBJS-$(CONFIG_QUIRC_FILTER)                  += vf_quirc.o
 OBJS-$(CONFIG_RANDOM_FILTER)                 += vf_random.o
 OBJS-$(CONFIG_READEIA608_FILTER)             += vf_readeia608.o
 OBJS-$(CONFIG_READVITC_FILTER)               += vf_readvitc.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 20feb37967..b8570dbab2 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -412,6 +412,7 @@ extern const AVFilter ff_vf_psnr;
 extern const AVFilter ff_vf_pullup;
 extern const AVFilter ff_vf_qp;
 extern const AVFilter ff_vf_qrencode;
+extern const AVFilter ff_vf_quirc;
 extern const AVFilter ff_vf_random;
 extern const AVFilter ff_vf_readeia608;
 extern const AVFilter ff_vf_readvitc;
diff --git a/libavfilter/vf_quirc.c b/libavfilter/vf_quirc.c
new file mode 100644
index 0000000000..62eb29b7ce
--- /dev/null
+++ b/libavfilter/vf_quirc.c
@@ -0,0 +1,183 @@
+/*
+ * 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,
+};
+