3 * Copyright (c) 2002 Philip Gladstone
5 * This module implements a text overlay for a video image. Currently it
6 * supports a fixed overlay or reading the text from a file. The string
7 * is passed through strftime so that it is easy to imprint the date and
12 * -c <color> The color of the text
13 * -F <fontname> The font face and size
15 * -f <filename> The filename to read text from
16 * -x <num> X coordinate to start text
17 * -y <num> Y coordinate to start text
19 * This module is very much intended as an example of what could be done.
20 * For example, you could overlay an image (even semi-transparent) like
21 * TV stations do. You can manipulate the image using imlib2 functions
24 * One caution is that this is an expensive process -- in particular the
25 * conversion of the image into RGB and back is time consuming. For some
26 * special cases -- e.g. painting black text -- it would be faster to paint
27 * the text into a bitmap and then combine it directly into the YUV
28 * image. However, this code is fast enough to handle 10 fps of 320x240 on a
29 * 900MHz Duron in maybe 15% of the CPU.
31 * This file is part of FFmpeg.
33 * FFmpeg is free software; you can redistribute it and/or
34 * modify it under the terms of the GNU Lesser General Public
35 * License as published by the Free Software Foundation; either
36 * version 2.1 of the License, or (at your option) any later version.
38 * FFmpeg is distributed in the hope that it will be useful,
39 * but WITHOUT ANY WARRANTY; without even the implied warranty of
40 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41 * Lesser General Public License for more details.
43 * You should have received a copy of the GNU Lesser General Public
44 * License along with FFmpeg; if not, write to the Free Software
45 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
48 #include "framehook.h"
63 static int sws_flags
= SWS_BICUBIC
;
73 struct _CachedImage
*cache
;
75 // This vhook first converts frame to RGB ...
76 struct SwsContext
*toRGB_convert_ctx
;
77 // ... and then converts back frame from RGB to initial format
78 struct SwsContext
*fromRGB_convert_ctx
;
81 typedef struct _CachedImage
{
82 struct _CachedImage
*next
;
88 void Release(void *ctx
)
91 ci
= (ContextInfo
*) ctx
;
94 imlib_context_set_image(ci
->cache
->image
);
99 sws_freeContext(ci
->toRGB_convert_ctx
);
100 sws_freeContext(ci
->fromRGB_convert_ctx
);
105 int Configure(void **ctxp
, int argc
, char *argv
[])
109 char *font
= "LucidaSansDemiBold/16";
110 char *fp
= getenv("FONTPATH");
114 *ctxp
= av_mallocz(sizeof(ContextInfo
));
115 ci
= (ContextInfo
*) *ctxp
;
120 imlib_add_path_to_font_path(fp
);
122 while ((c
= getopt(argc
, argv
, "c:f:F:t:x:y:")) > 0) {
131 ci
->text
= av_strdup(optarg
);
134 ci
->file
= av_strdup(optarg
);
137 ci
->x
= atoi(optarg
);
140 ci
->y
= atoi(optarg
);
143 fprintf(stderr
, "Unrecognized argument '%s'\n", argv
[optind
]);
148 ci
->fn
= imlib_load_font(font
);
150 fprintf(stderr
, "Failed to load font '%s'\n", font
);
153 imlib_context_set_font(ci
->fn
);
154 imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT
);
160 f
= fopen("/usr/share/X11/rgb.txt", "r");
162 f
= fopen("/usr/lib/X11/rgb.txt", "r");
164 fprintf(stderr
, "Failed to find rgb.txt\n");
167 while (fgets(buff
, sizeof(buff
), f
)) {
171 if (sscanf(buff
, "%d %d %d %64s", &r
, &g
, &b
, colname
) == 4 &&
172 strcasecmp(colname
, color
) == 0) {
176 /* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
183 fprintf(stderr
, "Unable to find color '%s' in rgb.txt\n", color
);
187 imlib_context_set_color(ci
->r
, ci
->g
, ci
->b
, 255);
191 static Imlib_Image
get_cached_image(ContextInfo
*ci
, int width
, int height
)
195 for (cache
= ci
->cache
; cache
; cache
= cache
->next
) {
196 if (width
== cache
->width
&& height
== cache
->height
)
203 static void put_cached_image(ContextInfo
*ci
, Imlib_Image image
, int width
, int height
)
205 CachedImage
*cache
= av_mallocz(sizeof(*cache
));
207 cache
->image
= image
;
208 cache
->width
= width
;
209 cache
->height
= height
;
210 cache
->next
= ci
->cache
;
214 void Process(void *ctx
, AVPicture
*picture
, enum PixelFormat pix_fmt
, int width
, int height
, int64_t pts
)
216 ContextInfo
*ci
= (ContextInfo
*) ctx
;
221 image
= get_cached_image(ci
, width
, height
);
224 image
= imlib_create_image(width
, height
);
225 put_cached_image(ci
, image
, width
, height
);
228 imlib_context_set_image(image
);
229 data
= imlib_image_get_data();
231 avpicture_fill(&picture1
, (uint8_t *) data
, PIX_FMT_RGBA32
, width
, height
);
233 // if we already got a SWS context, let's realloc if is not re-useable
234 ci
->toRGB_convert_ctx
= sws_getCachedContext(ci
->toRGB_convert_ctx
,
235 width
, height
, pix_fmt
,
236 width
, height
, PIX_FMT_RGBA32
,
237 sws_flags
, NULL
, NULL
, NULL
);
238 if (ci
->toRGB_convert_ctx
== NULL
) {
239 av_log(NULL
, AV_LOG_ERROR
,
240 "Cannot initialize the toRGB conversion context\n");
244 // img_convert parameters are 2 first destination, then 4 source
245 // sws_scale parameters are context, 4 first source, then 2 destination
246 sws_scale(ci
->toRGB_convert_ctx
,
247 picture
->data
, picture
->linesize
, 0, height
,
248 picture1
.data
, picture1
.linesize
);
250 imlib_image_set_has_alpha(0);
253 int wid
, hig
, h_a
, v_a
;
256 char *tbp
= ci
->text
;
257 time_t now
= time(0);
262 int fd
= open(ci
->file
, O_RDONLY
);
265 tbp
= "[File not found]";
267 int l
= read(fd
, tbuff
, sizeof(tbuff
) - 1);
279 strftime(buff
, sizeof(buff
), tbp ? tbp
: "[No data]", localtime(&now
));
284 for (p
= buff
; p
; p
= q
) {
289 imlib_text_draw_with_return_metrics(x
, y
, p
, &wid
, &hig
, &h_a
, &v_a
);
294 ci
->fromRGB_convert_ctx
= sws_getCachedContext(ci
->fromRGB_convert_ctx
,
295 width
, height
, PIX_FMT_RGBA32
,
296 width
, height
, pix_fmt
,
297 sws_flags
, NULL
, NULL
, NULL
);
298 if (ci
->fromRGB_convert_ctx
== NULL
) {
299 av_log(NULL
, AV_LOG_ERROR
,
300 "Cannot initialize the fromRGB conversion context\n");
303 // img_convert parameters are 2 first destination, then 4 source
304 // sws_scale parameters are context, 4 first source, then 2 destination
305 sws_scale(ci
->fromRGB_convert_ctx
,
306 picture1
.data
, picture1
.linesize
, 0, height
,
307 picture
->data
, picture
->linesize
);