avfilter: add codecview filter

3 files changed, 246 insertions, 0 deletions

diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 7486f96c9c..ce71ce1a24 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -97,6 +97,7 @@ OBJS-$(CONFIG_BLACKDETECT_FILTER)            += vf_blackdetect.o
 OBJS-$(CONFIG_BLACKFRAME_FILTER)             += vf_blackframe.o
 OBJS-$(CONFIG_BLEND_FILTER)                  += vf_blend.o dualinput.o framesync.o
 OBJS-$(CONFIG_BOXBLUR_FILTER)                += vf_boxblur.o
+OBJS-$(CONFIG_CODECVIEW_FILTER)              += vf_codecview.o
 OBJS-$(CONFIG_COLORBALANCE_FILTER)           += vf_colorbalance.o
 OBJS-$(CONFIG_COLORCHANNELMIXER_FILTER)      += vf_colorchannelmixer.o
 OBJS-$(CONFIG_COLORMATRIX_FILTER)            += vf_colormatrix.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index b1d6ff5b11..8fe2020901 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -115,6 +115,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(BLACKFRAME,     blackframe,     vf);
     REGISTER_FILTER(BLEND,          blend,          vf);
     REGISTER_FILTER(BOXBLUR,        boxblur,        vf);
+    REGISTER_FILTER(CODECVIEW,      codecview,      vf);
     REGISTER_FILTER(COLORBALANCE,   colorbalance,   vf);
     REGISTER_FILTER(COLORCHANNELMIXER, colorchannelmixer, vf);
     REGISTER_FILTER(COLORMATRIX,    colormatrix,    vf);
diff --git a/libavfilter/vf_codecview.c b/libavfilter/vf_codecview.c
new file mode 100644
index 0000000000..d777f97ef2
--- /dev/null
+++ b/libavfilter/vf_codecview.c
@@ -0,0 +1,244 @@
+/*
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (c) 2014 Clément Bœsch <u pkh me>
+ *
+ * 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
+ * Codec debug viewer filter.
+ *
+ * All the MV drawing code from Michael Niedermayer is extracted from
+ * libavcodec/mpegvideo.c.
+ *
+ * TODO: segmentation
+ * TODO: quantization
+ */
+
+#include "libavutil/imgutils.h"
+#include "libavutil/motion_vector.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "internal.h"
+
+#define MV_P_FOR  (1<<0)
+#define MV_B_FOR  (1<<1)
+#define MV_B_BACK (1<<2)
+
+typedef struct {
+    const AVClass *class;
+    unsigned mv;
+} CodecViewContext;
+
+#define OFFSET(x) offsetof(CodecViewContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption codecview_options[] = {
+    { "mv", "set motion vectors to visualize", OFFSET(mv), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, INT_MAX, FLAGS, "mv" },
+        {"pf", "forward predicted MVs of P-frames",  0, AV_OPT_TYPE_CONST, {.i64 = MV_P_FOR },  INT_MIN, INT_MAX, FLAGS, "mv"},
+        {"bf", "forward predicted MVs of B-frames",  0, AV_OPT_TYPE_CONST, {.i64 = MV_B_FOR },  INT_MIN, INT_MAX, FLAGS, "mv"},
+        {"bb", "backward predicted MVs of B-frames", 0, AV_OPT_TYPE_CONST, {.i64 = MV_B_BACK }, INT_MIN, INT_MAX, FLAGS, "mv"},
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(codecview);
+
+static int query_formats(AVFilterContext *ctx)
+{
+    // TODO: we can probably add way more pixel formats without any other
+    // changes; anything with 8-bit luma in first plane should be working
+    static const enum AVPixelFormat pix_fmts[] = {AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE};
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+    return 0;
+}
+
+static int clip_line(int *sx, int *sy, int *ex, int *ey, int maxx)
+{
+    if(*sx > *ex)
+        return clip_line(ex, ey, sx, sy, maxx);
+
+    if (*sx < 0) {
+        if (*ex < 0)
+            return 1;
+        *sy = *ey + (*sy - *ey) * (int64_t)*ex / (*ex - *sx);
+        *sx = 0;
+    }
+
+    if (*ex > maxx) {
+        if (*sx > maxx)
+            return 1;
+        *ey = *sy + (*ey - *sy) * (int64_t)(maxx - *sx) / (*ex - *sx);
+        *ex = maxx;
+    }
+    return 0;
+}
+
+/**
+ * Draw a line from (ex, ey) -> (sx, sy).
+ * @param w width of the image
+ * @param h height of the image
+ * @param stride stride/linesize of the image
+ * @param color color of the arrow
+ */
+static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey,
+                      int w, int h, int stride, int color)
+{
+    int x, y, fr, f;
+
+    if (clip_line(&sx, &sy, &ex, &ey, w - 1))
+        return;
+    if (clip_line(&sy, &sx, &ey, &ex, h - 1))
+        return;
+
+    sx = av_clip(sx, 0, w - 1);
+    sy = av_clip(sy, 0, h - 1);
+    ex = av_clip(ex, 0, w - 1);
+    ey = av_clip(ey, 0, h - 1);
+
+    buf[sy * stride + sx] += color;
+
+    if (FFABS(ex - sx) > FFABS(ey - sy)) {
+        if (sx > ex) {
+            FFSWAP(int, sx, ex);
+            FFSWAP(int, sy, ey);
+        }
+        buf += sx + sy * stride;
+        ex  -= sx;
+        f    = ((ey - sy) << 16) / ex;
+        for (x = 0; x <= ex; x++) {
+            y  = (x * f) >> 16;
+            fr = (x * f) & 0xFFFF;
+                   buf[ y      * stride + x] += (color * (0x10000 - fr)) >> 16;
+            if(fr) buf[(y + 1) * stride + x] += (color *            fr ) >> 16;
+        }
+    } else {
+        if (sy > ey) {
+            FFSWAP(int, sx, ex);
+            FFSWAP(int, sy, ey);
+        }
+        buf += sx + sy * stride;
+        ey  -= sy;
+        if (ey)
+            f = ((ex - sx) << 16) / ey;
+        else
+            f = 0;
+        for(y= 0; y <= ey; y++){
+            x  = (y*f) >> 16;
+            fr = (y*f) & 0xFFFF;
+                   buf[y * stride + x    ] += (color * (0x10000 - fr)) >> 16;
+            if(fr) buf[y * stride + x + 1] += (color *            fr ) >> 16;
+        }
+    }
+}
+
+/**
+ * Draw an arrow from (ex, ey) -> (sx, sy).
+ * @param w width of the image
+ * @param h height of the image
+ * @param stride stride/linesize of the image
+ * @param color color of the arrow
+ */
+static void draw_arrow(uint8_t *buf, int sx, int sy, int ex,
+                       int ey, int w, int h, int stride, int color, int tail, int direction)
+{
+    int dx,dy;
+
+    if (direction) {
+        FFSWAP(int, sx, ex);
+        FFSWAP(int, sy, ey);
+    }
+
+    sx = av_clip(sx, -100, w + 100);
+    sy = av_clip(sy, -100, h + 100);
+    ex = av_clip(ex, -100, w + 100);
+    ey = av_clip(ey, -100, h + 100);
+
+    dx = ex - sx;
+    dy = ey - sy;
+
+    if (dx * dx + dy * dy > 3 * 3) {
+        int rx =  dx + dy;
+        int ry = -dx + dy;
+        int length = sqrt((rx * rx + ry * ry) << 8);
+
+        // FIXME subpixel accuracy
+        rx = ROUNDED_DIV(rx * 3 << 4, length);
+        ry = ROUNDED_DIV(ry * 3 << 4, length);
+
+        if (tail) {
+            rx = -rx;
+            ry = -ry;
+        }
+
+        draw_line(buf, sx, sy, sx + rx, sy + ry, w, h, stride, color);
+        draw_line(buf, sx, sy, sx - ry, sy + rx, w, h, stride, color);
+    }
+    draw_line(buf, sx, sy, ex, ey, w, h, stride, color);
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+    AVFilterContext *ctx = inlink->dst;
+    CodecViewContext *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+
+    AVFrameSideData *sd = av_frame_get_side_data(frame, AV_FRAME_DATA_MOTION_VECTORS);
+    if (sd) {
+        int i;
+        const AVMotionVector *mvs = (const AVMotionVector *)sd->data;
+        for (i = 0; i < sd->size / sizeof(*mvs); i++) {
+            const AVMotionVector *mv = &mvs[i];
+            const int direction = mv->source > 0;
+            if ((direction == 0 && (s->mv & MV_P_FOR)  && frame->pict_type == AV_PICTURE_TYPE_P) ||
+                (direction == 0 && (s->mv & MV_B_FOR)  && frame->pict_type == AV_PICTURE_TYPE_B) ||
+                (direction == 1 && (s->mv & MV_B_BACK) && frame->pict_type == AV_PICTURE_TYPE_B))
+                draw_arrow(frame->data[0], mv->dst_x, mv->dst_y, mv->src_x, mv->src_y,
+                           frame->width, frame->height, frame->linesize[0],
+                           100, 0, mv->source > 0);
+        }
+    }
+    return ff_filter_frame(outlink, frame);
+}
+
+static const AVFilterPad codecview_inputs[] = {
+    {
+        .name           = "default",
+        .type           = AVMEDIA_TYPE_VIDEO,
+        .filter_frame   = filter_frame,
+        .needs_writable = 1,
+     },
+     { NULL }
+};
+
+static const AVFilterPad codecview_outputs[] = {
+     {
+         .name = "default",
+         .type = AVMEDIA_TYPE_VIDEO,
+     },
+     { NULL }
+};
+
+AVFilter ff_vf_codecview = {
+    .name          = "codecview",
+    .description   = NULL_IF_CONFIG_SMALL("Visualize information about some codecs"),
+    .priv_size     = sizeof(CodecViewContext),
+    .query_formats = query_formats,
+    .inputs        = codecview_inputs,
+    .outputs       = codecview_outputs,
+    .priv_class    = &codecview_class,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};