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ffmpeg/vhook/imlib2.c

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/*
* imlib2 based hook
* Copyright (c) 2002 Philip Gladstone
*
* This module implements a text overlay for a video image. Currently it
* supports a fixed overlay or reading the text from a file. The string
* is passed through strftime so that it is easy to imprint the date and
* time onto the image.
*
* You may also overlay an image (even semi-transparent) like TV stations do.
* You may move either the text or the image around your video to create
* scrolling credits, for example.
*
* Text fonts are being looked for in FONTPATH
*
* Options:
*
* -c <color> The color of the text
* -F <fontname> The font face and size
* -t <text> The text
* -f <filename> The filename to read text from
* -x <expresion> X coordinate of text or image
* -y <expresion> Y coordinate of text or image
* -i <filename> The filename to read a image from
*
* Expresions are functions of:
* N // frame number (starting at zero)
* H // frame height
* W // frame width
* h // image height
* w // image width
* X // previous x
* Y // previous y
*
Examples:
FONTPATH="/cygdrive/c/WINDOWS/Fonts/"
FONTPATH="$FONTPATH:/usr/share/imlib2/data/fonts/"
FONTPATH="$FONTPATH:/usr/X11R6/lib/X11/fonts/TTF/"
export FONTPATH
ffmpeg -i input.avi -vhook \
'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'
-acodec copy -sameq output.avi
ffmpeg -i input.avi -vhook \
'vhook/imlib2.dll -c red -F Vera.ttf/20 -x 150+0.5*N -y 70+0.25*N -t Hello'
-acodec copy -sameq output.avi
* This module is very much intended as an example of what could be done.
*
* One caution is that this is an expensive process -- in particular the
* conversion of the image into RGB and back is time consuming. For some
* special cases -- e.g. painting black text -- it would be faster to paint
* the text into a bitmap and then combine it directly into the YUV
* image. However, this code is fast enough to handle 10 fps of 320x240 on a
* 900MHz Duron in maybe 15% of the CPU.
* See further statistics on Pentium4, 3GHz, FFMpeg is SVN-r6798
* Input movie is 20.2 seconds of PAL DV on AVI
* Output movie is DVD compliant VOB.
*
ffmpeg -i input.avi -target pal-dvd out.vob
# 13.516s just transcode
ffmpeg -i input.avi -vhook /usr/local/bin/vhook/null.dll -target pal-dvd out.vob
# 23.546s transcode and img_convert
ffmpeg -i input.avi -vhook \
'vhook/imlib2.dll -c red -F Vera/20 -x 150-0.5*N -y 70+0.25*N -t Hello_person' \
-target pal-dvd out.vob
# 21.454s transcode, img_convert and move text around
ffmpeg -i input.avi -vhook \
'vhook/imlib2.dll -x 150-0.5*N -y 70+0.25*N -i /usr/share/imlib2/data/images/bulb.png' \
-target pal-dvd out.vob
# 20.828s transcode, img_convert and move image around
*
* 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
*/
#include "framehook.h"
#include "swscale.h"
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#undef time
#include <sys/time.h>
#include <time.h>
#include <Imlib2.h>
#include "eval.h"
const char *const_names[]={
"PI",
"E",
"N", // frame number (starting at zero)
"H", // frame height
"W", // frame width
"h", // image height
"w", // image width
"X", // previous x
"Y", // previous y
NULL
};
static int sws_flags = SWS_BICUBIC;
typedef struct {
int dummy;
Imlib_Font fn;
char *text;
char *file;
int r, g, b;
double x, y;
char *fileImage;
struct _CachedImage *cache;
Imlib_Image imageOverlaid;
AVEvalExpr *eval_x, *eval_y;
char *expr_x, *expr_y;
int frame_number;
int imageOverlaid_width, imageOverlaid_height;
// This vhook first converts frame to RGB ...
struct SwsContext *toRGB_convert_ctx;
// ... and then converts back frame from RGB to initial format
struct SwsContext *fromRGB_convert_ctx;
} ContextInfo;
typedef struct _CachedImage {
struct _CachedImage *next;
Imlib_Image image;
int width;
int height;
} CachedImage;
void Release(void *ctx)
{
ContextInfo *ci;
ci = (ContextInfo *) ctx;
if (ci->cache) {
imlib_context_set_image(ci->cache->image);
imlib_free_image();
av_free(ci->cache);
}
if (ctx) {
if (ci->imageOverlaid) {
imlib_context_set_image(ci->imageOverlaid);
imlib_free_image();
}
ff_eval_free(ci->expr_x);
ff_eval_free(ci->expr_y);
sws_freeContext(ci->toRGB_convert_ctx);
sws_freeContext(ci->fromRGB_convert_ctx);
av_free(ctx);
}
}
int Configure(void **ctxp, int argc, char *argv[])
{
int c;
ContextInfo *ci;
char *font = "LucidaSansDemiBold/16";
char *fp = getenv("FONTPATH");
char *color = 0;
FILE *f;
char *p;
*ctxp = av_mallocz(sizeof(ContextInfo));
ci = (ContextInfo *) *ctxp;
ci->x = 0.0;
ci->y = 0.0;
ci->expr_x = "0.0";
ci->expr_y = "0.0";
optind = 0;
/* Use ':' to split FONTPATH */
if (fp)
while (p = strchr(fp, ':')) {
*p = 0;
imlib_add_path_to_font_path(fp);
fp = p + 1;
}
if ((fp) && (*fp))
imlib_add_path_to_font_path(fp);
while ((c = getopt(argc, argv, "c:f:F:t:x:y:i:")) > 0) {
switch (c) {
case 'c':
color = optarg;
break;
case 'F':
font = optarg;
break;
case 't':
ci->text = av_strdup(optarg);
break;
case 'f':
ci->file = av_strdup(optarg);
break;
case 'x':
ci->expr_x = av_strdup(optarg);
break;
case 'y':
ci->expr_y = av_strdup(optarg);
break;
case 'i':
ci->fileImage = av_strdup(optarg);
break;
case '?':
fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
return -1;
}
}
if (ci->text || ci->file) {
ci->fn = imlib_load_font(font);
if (!ci->fn) {
fprintf(stderr, "Failed to load font '%s'\n", font);
return -1;
}
imlib_context_set_font(ci->fn);
imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
}
if (color) {
char buff[256];
int done = 0;
f = fopen("/usr/share/X11/rgb.txt", "r");
if (!f)
f = fopen("/usr/lib/X11/rgb.txt", "r");
if (!f) {
fprintf(stderr, "Failed to find rgb.txt\n");
return -1;
}
while (fgets(buff, sizeof(buff), f)) {
int r, g, b;
char colname[80];
if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
strcasecmp(colname, color) == 0) {
ci->r = r;
ci->g = g;
ci->b = b;
/* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
done = 1;
break;
}
}
fclose(f);
if (!done) {
fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
return -1;
}
}
imlib_context_set_color(ci->r, ci->g, ci->b, 255);
/* load the image (for example, credits for a movie) */
if (ci->fileImage) {
ci->imageOverlaid = imlib_load_image_immediately(ci->fileImage);
if (!(ci->imageOverlaid)){
av_log(NULL, AV_LOG_ERROR, "Couldn't load image '%s'\n", ci->fileImage);
return -1;
}
imlib_context_set_image(ci->imageOverlaid);
ci->imageOverlaid_width = imlib_image_get_width();
ci->imageOverlaid_height = imlib_image_get_height();
}
if (!(ci->eval_x = ff_parse(ci->expr_x, const_names, NULL, NULL, NULL, NULL, NULL))){
av_log(NULL, AV_LOG_ERROR, "Couldn't parse x expression '%s'\n", ci->expr_x);
return -1;
}
if (!(ci->eval_y = ff_parse(ci->expr_y, const_names, NULL, NULL, NULL, NULL, NULL))){
av_log(NULL, AV_LOG_ERROR, "Couldn't parse y expression '%s'\n", ci->expr_y);
return -1;
}
return 0;
}
static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
{
CachedImage *cache;
for (cache = ci->cache; cache; cache = cache->next) {
if (width == cache->width && height == cache->height)
return cache->image;
}
return NULL;
}
static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
{
CachedImage *cache = av_mallocz(sizeof(*cache));
cache->image = image;
cache->width = width;
cache->height = height;
cache->next = ci->cache;
ci->cache = cache;
}
void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
{
ContextInfo *ci = (ContextInfo *) ctx;
AVPicture picture1;
Imlib_Image image;
DATA32 *data;
image = get_cached_image(ci, width, height);
if (!image) {
image = imlib_create_image(width, height);
put_cached_image(ci, image, width, height);
}
imlib_context_set_image(image);
data = imlib_image_get_data();
avpicture_fill(&picture1, (uint8_t *) data, PIX_FMT_RGB32, width, height);
// if we already got a SWS context, let's realloc if is not re-useable
ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
width, height, pix_fmt,
width, height, PIX_FMT_RGB32,
sws_flags, NULL, NULL, NULL);
if (ci->toRGB_convert_ctx == NULL) {
av_log(NULL, AV_LOG_ERROR,
"Cannot initialize the toRGB 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->toRGB_convert_ctx,
picture->data, picture->linesize, 0, height,
picture1.data, picture1.linesize);
imlib_image_set_has_alpha(0);
{
int wid, hig, h_a, v_a;
char buff[1000];
char tbuff[1000];
char *tbp = ci->text;
time_t now = time(0);
char *p, *q;
int y;
double const_values[]={
M_PI,
M_E,
ci->frame_number, // frame number (starting at zero)
height, // frame height
width, // frame width
ci->imageOverlaid_height, // image height
ci->imageOverlaid_width, // image width
ci->x, // previous x
ci->y, // previous y
0
};
if (ci->file) {
int fd = open(ci->file, O_RDONLY);
if (fd < 0) {
tbp = "[File not found]";
} else {
int l = read(fd, tbuff, sizeof(tbuff) - 1);
if (l >= 0) {
tbuff[l] = 0;
tbp = tbuff;
} else {
tbp = "[I/O Error]";
}
close(fd);
}
}
if (tbp)
strftime(buff, sizeof(buff), tbp, localtime(&now));
else if (!(ci->imageOverlaid))
strftime(buff, sizeof(buff), "[No data]", localtime(&now));
ci->x = ff_parse_eval(ci->eval_x, const_values, ci);
ci->y = ff_parse_eval(ci->eval_y, const_values, ci);
y = ci->y;
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++;
}
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