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ffmpeg / vhook / imlib2.c @ ca345e44

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/*
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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 <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 <expresion>       X coordinate of text or image
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 * -y <expresion>       Y coordinate of text or image
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 * -i <filename>        The filename to read a image from
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 *
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 * Expresions 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;
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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->expr_x);
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        ff_eval_free(ci->expr_y);
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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 *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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    *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, "c:f:F:t:x:y:i:")) > 0) {
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        switch (c) {
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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->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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        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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        if (!f) {
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            fprintf(stderr, "Failed to find rgb.txt\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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    }
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    imlib_context_set_color(ci->r, ci->g, ci->b, 255);
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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, NULL))){
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        av_log(NULL, AV_LOG_ERROR, "Couldn't parse x expression '%s'\n", ci->expr_x);
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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, NULL))){
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        av_log(NULL, AV_LOG_ERROR, "Couldn't parse y expression '%s'\n", ci->expr_y);
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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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    {
365
        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) {
387
            int fd = open(ci->file, O_RDONLY);
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389
            if (fd < 0) {
390
                tbp = "[File not found]";
391
            } else {
392
                int l = read(fd, tbuff, sizeof(tbuff) - 1);
393

    
394
                if (l >= 0) {
395
                    tbuff[l] = 0;
396
                    tbp = tbuff;
397
                } else {
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                    tbp = "[I/O Error]";
399
                }
400
                close(fd);
401
            }
402
        }
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404
        if (tbp)
405
            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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413
        if (!(ci->imageOverlaid))
414
        for (p = buff; p; p = q) {
415
            q = strchr(p, '\n');
416
            if (q)
417
                *q++ = 0;
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419
            imlib_text_draw_with_return_metrics(ci->x, y, p, &wid, &hig, &h_a, &v_a);
420
            y += v_a;
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        }
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423
        if (ci->imageOverlaid) {
424
            imlib_context_set_image(image);
425
            imlib_blend_image_onto_image(ci->imageOverlaid, 0,
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                0, 0, ci->imageOverlaid_width, ci->imageOverlaid_height,
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                ci->x, ci->y, ci->imageOverlaid_width, ci->imageOverlaid_height);
428
        }
429

    
430
    }
431

    
432
    ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
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                                    width, height, PIX_FMT_RGB32,
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                                    width, height, pix_fmt,
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                                    sws_flags, NULL, NULL, NULL);
436
    if (ci->fromRGB_convert_ctx == NULL) {
437
        av_log(NULL, AV_LOG_ERROR,
438
               "Cannot initialize the fromRGB conversion context\n");
439
        return;
440
    }
441
// img_convert parameters are          2 first destination, then 4 source
442
// sws_scale   parameters are context, 4 first source,      then 2 destination
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    sws_scale(ci->fromRGB_convert_ctx,
444
             picture1.data, picture1.linesize, 0, height,
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             picture->data, picture->linesize);
446

    
447
    ci->frame_number++;
448
}
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