| 1 | /* |
| 2 | * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> |
| 3 | * Copyright (c) 2014 Clément Bœsch <u pkh me> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Codec debug viewer filter. |
| 25 | * |
| 26 | * All the MV drawing code from Michael Niedermayer is extracted from |
| 27 | * libavcodec/mpegvideo.c. |
| 28 | * |
| 29 | * TODO: segmentation |
| 30 | * TODO: quantization |
| 31 | */ |
| 32 | |
| 33 | #include "libavutil/imgutils.h" |
| 34 | #include "libavutil/motion_vector.h" |
| 35 | #include "libavutil/opt.h" |
| 36 | #include "avfilter.h" |
| 37 | #include "internal.h" |
| 38 | |
| 39 | #define MV_P_FOR (1<<0) |
| 40 | #define MV_B_FOR (1<<1) |
| 41 | #define MV_B_BACK (1<<2) |
| 42 | |
| 43 | typedef struct { |
| 44 | const AVClass *class; |
| 45 | unsigned mv; |
| 46 | } CodecViewContext; |
| 47 | |
| 48 | #define OFFSET(x) offsetof(CodecViewContext, x) |
| 49 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| 50 | static const AVOption codecview_options[] = { |
| 51 | { "mv", "set motion vectors to visualize", OFFSET(mv), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, INT_MAX, FLAGS, "mv" }, |
| 52 | {"pf", "forward predicted MVs of P-frames", 0, AV_OPT_TYPE_CONST, {.i64 = MV_P_FOR }, INT_MIN, INT_MAX, FLAGS, "mv"}, |
| 53 | {"bf", "forward predicted MVs of B-frames", 0, AV_OPT_TYPE_CONST, {.i64 = MV_B_FOR }, INT_MIN, INT_MAX, FLAGS, "mv"}, |
| 54 | {"bb", "backward predicted MVs of B-frames", 0, AV_OPT_TYPE_CONST, {.i64 = MV_B_BACK }, INT_MIN, INT_MAX, FLAGS, "mv"}, |
| 55 | { NULL } |
| 56 | }; |
| 57 | |
| 58 | AVFILTER_DEFINE_CLASS(codecview); |
| 59 | |
| 60 | static int query_formats(AVFilterContext *ctx) |
| 61 | { |
| 62 | // TODO: we can probably add way more pixel formats without any other |
| 63 | // changes; anything with 8-bit luma in first plane should be working |
| 64 | static const enum AVPixelFormat pix_fmts[] = {AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE}; |
| 65 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | static int clip_line(int *sx, int *sy, int *ex, int *ey, int maxx) |
| 70 | { |
| 71 | if(*sx > *ex) |
| 72 | return clip_line(ex, ey, sx, sy, maxx); |
| 73 | |
| 74 | if (*sx < 0) { |
| 75 | if (*ex < 0) |
| 76 | return 1; |
| 77 | *sy = *ey + (*sy - *ey) * (int64_t)*ex / (*ex - *sx); |
| 78 | *sx = 0; |
| 79 | } |
| 80 | |
| 81 | if (*ex > maxx) { |
| 82 | if (*sx > maxx) |
| 83 | return 1; |
| 84 | *ey = *sy + (*ey - *sy) * (int64_t)(maxx - *sx) / (*ex - *sx); |
| 85 | *ex = maxx; |
| 86 | } |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Draw a line from (ex, ey) -> (sx, sy). |
| 92 | * @param w width of the image |
| 93 | * @param h height of the image |
| 94 | * @param stride stride/linesize of the image |
| 95 | * @param color color of the arrow |
| 96 | */ |
| 97 | static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey, |
| 98 | int w, int h, int stride, int color) |
| 99 | { |
| 100 | int x, y, fr, f; |
| 101 | |
| 102 | if (clip_line(&sx, &sy, &ex, &ey, w - 1)) |
| 103 | return; |
| 104 | if (clip_line(&sy, &sx, &ey, &ex, h - 1)) |
| 105 | return; |
| 106 | |
| 107 | sx = av_clip(sx, 0, w - 1); |
| 108 | sy = av_clip(sy, 0, h - 1); |
| 109 | ex = av_clip(ex, 0, w - 1); |
| 110 | ey = av_clip(ey, 0, h - 1); |
| 111 | |
| 112 | buf[sy * stride + sx] += color; |
| 113 | |
| 114 | if (FFABS(ex - sx) > FFABS(ey - sy)) { |
| 115 | if (sx > ex) { |
| 116 | FFSWAP(int, sx, ex); |
| 117 | FFSWAP(int, sy, ey); |
| 118 | } |
| 119 | buf += sx + sy * stride; |
| 120 | ex -= sx; |
| 121 | f = ((ey - sy) << 16) / ex; |
| 122 | for (x = 0; x <= ex; x++) { |
| 123 | y = (x * f) >> 16; |
| 124 | fr = (x * f) & 0xFFFF; |
| 125 | buf[ y * stride + x] += (color * (0x10000 - fr)) >> 16; |
| 126 | if(fr) buf[(y + 1) * stride + x] += (color * fr ) >> 16; |
| 127 | } |
| 128 | } else { |
| 129 | if (sy > ey) { |
| 130 | FFSWAP(int, sx, ex); |
| 131 | FFSWAP(int, sy, ey); |
| 132 | } |
| 133 | buf += sx + sy * stride; |
| 134 | ey -= sy; |
| 135 | if (ey) |
| 136 | f = ((ex - sx) << 16) / ey; |
| 137 | else |
| 138 | f = 0; |
| 139 | for(y= 0; y <= ey; y++){ |
| 140 | x = (y*f) >> 16; |
| 141 | fr = (y*f) & 0xFFFF; |
| 142 | buf[y * stride + x ] += (color * (0x10000 - fr)) >> 16; |
| 143 | if(fr) buf[y * stride + x + 1] += (color * fr ) >> 16; |
| 144 | } |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Draw an arrow from (ex, ey) -> (sx, sy). |
| 150 | * @param w width of the image |
| 151 | * @param h height of the image |
| 152 | * @param stride stride/linesize of the image |
| 153 | * @param color color of the arrow |
| 154 | */ |
| 155 | static void draw_arrow(uint8_t *buf, int sx, int sy, int ex, |
| 156 | int ey, int w, int h, int stride, int color, int tail, int direction) |
| 157 | { |
| 158 | int dx,dy; |
| 159 | |
| 160 | if (direction) { |
| 161 | FFSWAP(int, sx, ex); |
| 162 | FFSWAP(int, sy, ey); |
| 163 | } |
| 164 | |
| 165 | sx = av_clip(sx, -100, w + 100); |
| 166 | sy = av_clip(sy, -100, h + 100); |
| 167 | ex = av_clip(ex, -100, w + 100); |
| 168 | ey = av_clip(ey, -100, h + 100); |
| 169 | |
| 170 | dx = ex - sx; |
| 171 | dy = ey - sy; |
| 172 | |
| 173 | if (dx * dx + dy * dy > 3 * 3) { |
| 174 | int rx = dx + dy; |
| 175 | int ry = -dx + dy; |
| 176 | int length = sqrt((rx * rx + ry * ry) << 8); |
| 177 | |
| 178 | // FIXME subpixel accuracy |
| 179 | rx = ROUNDED_DIV(rx * 3 << 4, length); |
| 180 | ry = ROUNDED_DIV(ry * 3 << 4, length); |
| 181 | |
| 182 | if (tail) { |
| 183 | rx = -rx; |
| 184 | ry = -ry; |
| 185 | } |
| 186 | |
| 187 | draw_line(buf, sx, sy, sx + rx, sy + ry, w, h, stride, color); |
| 188 | draw_line(buf, sx, sy, sx - ry, sy + rx, w, h, stride, color); |
| 189 | } |
| 190 | draw_line(buf, sx, sy, ex, ey, w, h, stride, color); |
| 191 | } |
| 192 | |
| 193 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) |
| 194 | { |
| 195 | AVFilterContext *ctx = inlink->dst; |
| 196 | CodecViewContext *s = ctx->priv; |
| 197 | AVFilterLink *outlink = ctx->outputs[0]; |
| 198 | |
| 199 | AVFrameSideData *sd = av_frame_get_side_data(frame, AV_FRAME_DATA_MOTION_VECTORS); |
| 200 | if (sd) { |
| 201 | int i; |
| 202 | const AVMotionVector *mvs = (const AVMotionVector *)sd->data; |
| 203 | for (i = 0; i < sd->size / sizeof(*mvs); i++) { |
| 204 | const AVMotionVector *mv = &mvs[i]; |
| 205 | const int direction = mv->source > 0; |
| 206 | if ((direction == 0 && (s->mv & MV_P_FOR) && frame->pict_type == AV_PICTURE_TYPE_P) || |
| 207 | (direction == 0 && (s->mv & MV_B_FOR) && frame->pict_type == AV_PICTURE_TYPE_B) || |
| 208 | (direction == 1 && (s->mv & MV_B_BACK) && frame->pict_type == AV_PICTURE_TYPE_B)) |
| 209 | draw_arrow(frame->data[0], mv->dst_x, mv->dst_y, mv->src_x, mv->src_y, |
| 210 | frame->width, frame->height, frame->linesize[0], |
| 211 | 100, 0, mv->source > 0); |
| 212 | } |
| 213 | } |
| 214 | return ff_filter_frame(outlink, frame); |
| 215 | } |
| 216 | |
| 217 | static const AVFilterPad codecview_inputs[] = { |
| 218 | { |
| 219 | .name = "default", |
| 220 | .type = AVMEDIA_TYPE_VIDEO, |
| 221 | .filter_frame = filter_frame, |
| 222 | .needs_writable = 1, |
| 223 | }, |
| 224 | { NULL } |
| 225 | }; |
| 226 | |
| 227 | static const AVFilterPad codecview_outputs[] = { |
| 228 | { |
| 229 | .name = "default", |
| 230 | .type = AVMEDIA_TYPE_VIDEO, |
| 231 | }, |
| 232 | { NULL } |
| 233 | }; |
| 234 | |
| 235 | AVFilter ff_vf_codecview = { |
| 236 | .name = "codecview", |
| 237 | .description = NULL_IF_CONFIG_SMALL("Visualize information about some codecs"), |
| 238 | .priv_size = sizeof(CodecViewContext), |
| 239 | .query_formats = query_formats, |
| 240 | .inputs = codecview_inputs, |
| 241 | .outputs = codecview_outputs, |
| 242 | .priv_class = &codecview_class, |
| 243 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| 244 | }; |