mirror of
https://git.videolan.org/git/ffmpeg.git
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547 lines
17 KiB
C
547 lines
17 KiB
C
/*
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* imlib2 based hook
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* Copyright (c) 2002 Philip Gladstone
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*
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* This module implements a text overlay for a video image. Currently it
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* supports a fixed overlay or reading the text from a file. The string
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* is passed through strftime so that it is easy to imprint the date and
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* time onto the image.
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*
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* You may also overlay an image (even semi-transparent) like TV stations do.
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* You may move either the text or the image around your video to create
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* scrolling credits, for example.
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*
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* Text fonts are being looked for in FONTPATH
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*
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* Options:
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*
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* -C <rgb.txt> The filename to read RGB color names from
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* Defaults if none specified:
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* /usr/share/X11/rgb.txt
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* /usr/lib/X11/rgb.txt
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* -c <color> The color of the text
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* -F <fontname> The font face and size
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* -t <text> The text
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* -f <filename> The filename to read text from
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* -x <expression> X coordinate of text or image
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* -y <expression> Y coordinate of text or image
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* -i <filename> The filename to read a image from
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* -R <expression> Value for R color
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* -G <expression> Value for G color
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* -B <expression> Value for B color
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* -A <expression> Value for Alpha channel
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*
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* Expressions are functions of:
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* N // frame number (starting at zero)
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* H // frame height
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* W // frame width
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* h // image height
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* w // image width
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* X // previous x
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* Y // previous y
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*
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Examples:
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FONTPATH="/cygdrive/c/WINDOWS/Fonts/"
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FONTPATH="$FONTPATH:/usr/share/imlib2/data/fonts/"
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FONTPATH="$FONTPATH:/usr/X11R6/lib/X11/fonts/TTF/"
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export FONTPATH
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ffmpeg -i input.avi -vhook \
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'vhook/imlib2.dll -x W*(0.5+0.25*sin(N/47*PI))-w/2 -y H*(0.5+0.50*cos(N/97*PI))-h/2 -i /usr/share/imlib2/data/images/bulb.png'
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-acodec copy -sameq output.avi
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ffmpeg -i input.avi -vhook \
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'vhook/imlib2.dll -c red -F Vera.ttf/20 -x 150+0.5*N -y 70+0.25*N -t Hello'
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-acodec copy -sameq output.avi
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* This module is very much intended as an example of what could be done.
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*
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* One caution is that this is an expensive process -- in particular the
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* conversion of the image into RGB and back is time consuming. For some
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* special cases -- e.g. painting black text -- it would be faster to paint
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* the text into a bitmap and then combine it directly into the YUV
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* image. However, this code is fast enough to handle 10 fps of 320x240 on a
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* 900MHz Duron in maybe 15% of the CPU.
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* See further statistics on Pentium4, 3GHz, FFMpeg is SVN-r6798
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* Input movie is 20.2 seconds of PAL DV on AVI
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* Output movie is DVD compliant VOB.
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*
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ffmpeg -i input.avi -target pal-dvd out.vob
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# 13.516s just transcode
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ffmpeg -i input.avi -vhook /usr/local/bin/vhook/null.dll -target pal-dvd out.vob
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# 23.546s transcode and img_convert
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ffmpeg -i input.avi -vhook \
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'vhook/imlib2.dll -c red -F Vera/20 -x 150-0.5*N -y 70+0.25*N -t Hello_person' \
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-target pal-dvd out.vob
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# 21.454s transcode, img_convert and move text around
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ffmpeg -i input.avi -vhook \
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'vhook/imlib2.dll -x 150-0.5*N -y 70+0.25*N -i /usr/share/imlib2/data/images/bulb.png' \
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-target pal-dvd out.vob
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# 20.828s transcode, img_convert and move image around
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "framehook.h"
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#include "swscale.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#undef time
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#include <sys/time.h>
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#include <time.h>
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#include <Imlib2.h>
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#include "eval.h"
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const char *const_names[]={
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"PI",
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"E",
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"N", // frame number (starting at zero)
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"H", // frame height
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"W", // frame width
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"h", // image height
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"w", // image width
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"X", // previous x
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"Y", // previous y
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NULL
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};
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static int sws_flags = SWS_BICUBIC;
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typedef struct {
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int dummy;
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Imlib_Font fn;
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char *text;
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char *file;
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int r, g, b, a;
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AVEvalExpr *eval_r, *eval_g, *eval_b, *eval_a;
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char *expr_R, *expr_G, *expr_B, *expr_A;
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int eval_colors;
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double x, y;
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char *fileImage;
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struct _CachedImage *cache;
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Imlib_Image imageOverlaid;
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AVEvalExpr *eval_x, *eval_y;
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char *expr_x, *expr_y;
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int frame_number;
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int imageOverlaid_width, imageOverlaid_height;
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// This vhook first converts frame to RGB ...
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struct SwsContext *toRGB_convert_ctx;
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// ... and then converts back frame from RGB to initial format
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struct SwsContext *fromRGB_convert_ctx;
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} ContextInfo;
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typedef struct _CachedImage {
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struct _CachedImage *next;
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Imlib_Image image;
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int width;
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int height;
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} CachedImage;
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void Release(void *ctx)
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{
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ContextInfo *ci;
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ci = (ContextInfo *) ctx;
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if (ci->cache) {
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imlib_context_set_image(ci->cache->image);
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imlib_free_image();
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av_free(ci->cache);
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}
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if (ctx) {
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if (ci->imageOverlaid) {
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imlib_context_set_image(ci->imageOverlaid);
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imlib_free_image();
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}
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ff_eval_free(ci->eval_x);
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ff_eval_free(ci->eval_y);
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ff_eval_free(ci->eval_r);
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ff_eval_free(ci->eval_g);
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ff_eval_free(ci->eval_b);
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ff_eval_free(ci->eval_a);
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av_free(ci->expr_x);
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av_free(ci->expr_y);
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av_free(ci->expr_R);
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av_free(ci->expr_G);
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av_free(ci->expr_B);
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av_free(ci->expr_A);
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sws_freeContext(ci->toRGB_convert_ctx);
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sws_freeContext(ci->fromRGB_convert_ctx);
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av_free(ctx);
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}
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}
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int Configure(void **ctxp, int argc, char *argv[])
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{
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int c;
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ContextInfo *ci;
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char *rgbtxt = 0;
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char *font = "LucidaSansDemiBold/16";
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char *fp = getenv("FONTPATH");
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char *color = 0;
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FILE *f;
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char *p;
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char *error;
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*ctxp = av_mallocz(sizeof(ContextInfo));
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ci = (ContextInfo *) *ctxp;
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ci->x = 0.0;
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ci->y = 0.0;
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ci->expr_x = "0.0";
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ci->expr_y = "0.0";
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optind = 0;
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/* Use ':' to split FONTPATH */
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if (fp)
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while (p = strchr(fp, ':')) {
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*p = 0;
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imlib_add_path_to_font_path(fp);
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fp = p + 1;
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}
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if ((fp) && (*fp))
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imlib_add_path_to_font_path(fp);
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while ((c = getopt(argc, argv, "R:G:B:A:C:c:f:F:t:x:y:i:")) > 0) {
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switch (c) {
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case 'R':
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ci->expr_R = av_strdup(optarg);
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ci->eval_colors = 1;
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break;
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case 'G':
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ci->expr_G = av_strdup(optarg);
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ci->eval_colors = 1;
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break;
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case 'B':
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ci->expr_B = av_strdup(optarg);
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ci->eval_colors = 1;
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break;
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case 'A':
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ci->expr_A = av_strdup(optarg);
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break;
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case 'C':
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rgbtxt = optarg;
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break;
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case 'c':
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color = optarg;
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break;
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case 'F':
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font = optarg;
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break;
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case 't':
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ci->text = av_strdup(optarg);
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break;
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case 'f':
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ci->file = av_strdup(optarg);
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break;
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case 'x':
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ci->expr_x = av_strdup(optarg);
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break;
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case 'y':
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ci->expr_y = av_strdup(optarg);
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break;
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case 'i':
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ci->fileImage = av_strdup(optarg);
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break;
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case '?':
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fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
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return -1;
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}
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}
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if (ci->eval_colors && !(ci->expr_R && ci->expr_G && ci->expr_B))
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{
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fprintf(stderr, "You must specify expressions for all or no colors.\n");
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return -1;
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}
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if (ci->text || ci->file) {
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ci->fn = imlib_load_font(font);
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if (!ci->fn) {
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fprintf(stderr, "Failed to load font '%s'\n", font);
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return -1;
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}
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imlib_context_set_font(ci->fn);
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imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
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}
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if (color) {
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char buff[256];
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int done = 0;
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if (ci->eval_colors)
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{
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fprintf(stderr, "You must not specify both a color name and expressions for the colors.\n");
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return -1;
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}
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if (rgbtxt)
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f = fopen(rgbtxt, "r");
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else
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{
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f = fopen("/usr/share/X11/rgb.txt", "r");
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if (!f)
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f = fopen("/usr/lib/X11/rgb.txt", "r");
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}
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if (!f) {
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fprintf(stderr, "Failed to find RGB color names file\n");
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return -1;
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}
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while (fgets(buff, sizeof(buff), f)) {
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int r, g, b;
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char colname[80];
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if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
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strcasecmp(colname, color) == 0) {
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ci->r = r;
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ci->g = g;
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ci->b = b;
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/* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
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done = 1;
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break;
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}
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}
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fclose(f);
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if (!done) {
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fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
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return -1;
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}
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} else if (ci->eval_colors) {
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if (!(ci->eval_r = ff_parse(ci->expr_R, const_names, NULL, NULL, NULL, NULL, &error))){
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av_log(NULL, AV_LOG_ERROR, "Couldn't parse R expression '%s': %s\n", ci->expr_R, error);
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return -1;
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}
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if (!(ci->eval_g = ff_parse(ci->expr_G, const_names, NULL, NULL, NULL, NULL, &error))){
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av_log(NULL, AV_LOG_ERROR, "Couldn't parse G expression '%s': %s\n", ci->expr_G, error);
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return -1;
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}
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if (!(ci->eval_b = ff_parse(ci->expr_B, const_names, NULL, NULL, NULL, NULL, &error))){
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av_log(NULL, AV_LOG_ERROR, "Couldn't parse B expression '%s': %s\n", ci->expr_B, error);
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return -1;
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}
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}
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if (ci->expr_A) {
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if (!(ci->eval_a = ff_parse(ci->expr_A, const_names, NULL, NULL, NULL, NULL, &error))){
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av_log(NULL, AV_LOG_ERROR, "Couldn't parse A expression '%s': %s\n", ci->expr_A, error);
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return -1;
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}
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} else {
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ci->a = 255;
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}
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if (!(ci->eval_colors || ci->eval_a))
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imlib_context_set_color(ci->r, ci->g, ci->b, ci->a);
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/* load the image (for example, credits for a movie) */
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if (ci->fileImage) {
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ci->imageOverlaid = imlib_load_image_immediately(ci->fileImage);
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if (!(ci->imageOverlaid)){
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av_log(NULL, AV_LOG_ERROR, "Couldn't load image '%s'\n", ci->fileImage);
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return -1;
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}
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imlib_context_set_image(ci->imageOverlaid);
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ci->imageOverlaid_width = imlib_image_get_width();
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ci->imageOverlaid_height = imlib_image_get_height();
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}
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if (!(ci->eval_x = ff_parse(ci->expr_x, const_names, NULL, NULL, NULL, NULL, &error))){
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av_log(NULL, AV_LOG_ERROR, "Couldn't parse x expression '%s': %s\n", ci->expr_x, error);
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return -1;
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}
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if (!(ci->eval_y = ff_parse(ci->expr_y, const_names, NULL, NULL, NULL, NULL, &error))){
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av_log(NULL, AV_LOG_ERROR, "Couldn't parse y expression '%s': %s\n", ci->expr_y, error);
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return -1;
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}
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return 0;
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}
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static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
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{
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CachedImage *cache;
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for (cache = ci->cache; cache; cache = cache->next) {
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if (width == cache->width && height == cache->height)
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return cache->image;
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}
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return NULL;
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}
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static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
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{
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CachedImage *cache = av_mallocz(sizeof(*cache));
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cache->image = image;
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cache->width = width;
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cache->height = height;
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cache->next = ci->cache;
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ci->cache = cache;
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}
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void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
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{
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ContextInfo *ci = (ContextInfo *) ctx;
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AVPicture picture1;
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Imlib_Image image;
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DATA32 *data;
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image = get_cached_image(ci, width, height);
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if (!image) {
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image = imlib_create_image(width, height);
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put_cached_image(ci, image, width, height);
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}
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imlib_context_set_image(image);
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data = imlib_image_get_data();
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avpicture_fill(&picture1, (uint8_t *) data, PIX_FMT_RGB32, width, height);
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// if we already got a SWS context, let's realloc if is not re-useable
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ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
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width, height, pix_fmt,
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width, height, PIX_FMT_RGB32,
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sws_flags, NULL, NULL, NULL);
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if (ci->toRGB_convert_ctx == NULL) {
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av_log(NULL, AV_LOG_ERROR,
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"Cannot initialize the toRGB conversion context\n");
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return;
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}
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// img_convert parameters are 2 first destination, then 4 source
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// sws_scale parameters are context, 4 first source, then 2 destination
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sws_scale(ci->toRGB_convert_ctx,
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picture->data, picture->linesize, 0, height,
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picture1.data, picture1.linesize);
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imlib_image_set_has_alpha(0);
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{
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int wid, hig, h_a, v_a;
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char buff[1000];
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char tbuff[1000];
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char *tbp = ci->text;
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time_t now = time(0);
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char *p, *q;
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int y;
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double const_values[]={
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M_PI,
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M_E,
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ci->frame_number, // frame number (starting at zero)
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height, // frame height
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width, // frame width
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ci->imageOverlaid_height, // image height
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ci->imageOverlaid_width, // image width
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ci->x, // previous x
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ci->y, // previous y
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0
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};
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if (ci->file) {
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int fd = open(ci->file, O_RDONLY);
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if (fd < 0) {
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tbp = "[File not found]";
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} else {
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int l = read(fd, tbuff, sizeof(tbuff) - 1);
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if (l >= 0) {
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tbuff[l] = 0;
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tbp = tbuff;
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} else {
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tbp = "[I/O Error]";
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}
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close(fd);
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}
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}
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if (tbp)
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strftime(buff, sizeof(buff), tbp, localtime(&now));
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else if (!(ci->imageOverlaid))
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strftime(buff, sizeof(buff), "[No data]", localtime(&now));
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ci->x = ff_parse_eval(ci->eval_x, const_values, ci);
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ci->y = ff_parse_eval(ci->eval_y, const_values, ci);
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y = ci->y;
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|
if (ci->eval_a) {
|
|
ci->a = ff_parse_eval(ci->eval_a, const_values, ci);
|
|
}
|
|
|
|
if (ci->eval_colors) {
|
|
ci->r = ff_parse_eval(ci->eval_r, const_values, ci);
|
|
ci->g = ff_parse_eval(ci->eval_g, const_values, ci);
|
|
ci->b = ff_parse_eval(ci->eval_b, const_values, ci);
|
|
}
|
|
|
|
if (ci->eval_colors || ci->eval_a) {
|
|
imlib_context_set_color(ci->r, ci->g, ci->b, ci->a);
|
|
}
|
|
|
|
if (!(ci->imageOverlaid))
|
|
for (p = buff; p; p = q) {
|
|
q = strchr(p, '\n');
|
|
if (q)
|
|
*q++ = 0;
|
|
|
|
imlib_text_draw_with_return_metrics(ci->x, y, p, &wid, &hig, &h_a, &v_a);
|
|
y += v_a;
|
|
}
|
|
|
|
if (ci->imageOverlaid) {
|
|
imlib_context_set_image(image);
|
|
imlib_blend_image_onto_image(ci->imageOverlaid, 0,
|
|
0, 0, ci->imageOverlaid_width, ci->imageOverlaid_height,
|
|
ci->x, ci->y, ci->imageOverlaid_width, ci->imageOverlaid_height);
|
|
}
|
|
|
|
}
|
|
|
|
ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
|
|
width, height, PIX_FMT_RGB32,
|
|
width, height, pix_fmt,
|
|
sws_flags, NULL, NULL, NULL);
|
|
if (ci->fromRGB_convert_ctx == NULL) {
|
|
av_log(NULL, AV_LOG_ERROR,
|
|
"Cannot initialize the fromRGB conversion context\n");
|
|
return;
|
|
}
|
|
// img_convert parameters are 2 first destination, then 4 source
|
|
// sws_scale parameters are context, 4 first source, then 2 destination
|
|
sws_scale(ci->fromRGB_convert_ctx,
|
|
picture1.data, picture1.linesize, 0, height,
|
|
picture->data, picture->linesize);
|
|
|
|
ci->frame_number++;
|
|
}
|
|
|