mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-18 07:15:04 +02:00
![Stefano Sabatini](/assets/img/avatar_default.png)
is deprecated and will be dropped at the next major bump. Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
227 lines
6.9 KiB
C
227 lines
6.9 KiB
C
/*
|
|
* DVD subtitle encoding for ffmpeg
|
|
* Copyright (c) 2005 Wolfram Gloger
|
|
*
|
|
* 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 "avcodec.h"
|
|
#include "bytestream.h"
|
|
|
|
#undef NDEBUG
|
|
#include <assert.h>
|
|
|
|
// ncnt is the nibble counter
|
|
#define PUTNIBBLE(val)\
|
|
do {\
|
|
if (ncnt++ & 1)\
|
|
*q++ = bitbuf | ((val) & 0x0f);\
|
|
else\
|
|
bitbuf = (val) << 4;\
|
|
} while(0)
|
|
|
|
static void dvd_encode_rle(uint8_t **pq,
|
|
const uint8_t *bitmap, int linesize,
|
|
int w, int h,
|
|
const int cmap[256])
|
|
{
|
|
uint8_t *q;
|
|
unsigned int bitbuf = 0;
|
|
int ncnt;
|
|
int x, y, len, color;
|
|
|
|
q = *pq;
|
|
|
|
for (y = 0; y < h; ++y) {
|
|
ncnt = 0;
|
|
for(x = 0; x < w; x += len) {
|
|
color = bitmap[x];
|
|
for (len=1; x+len < w; ++len)
|
|
if (bitmap[x+len] != color)
|
|
break;
|
|
color = cmap[color];
|
|
assert(color < 4);
|
|
if (len < 0x04) {
|
|
PUTNIBBLE((len << 2)|color);
|
|
} else if (len < 0x10) {
|
|
PUTNIBBLE(len >> 2);
|
|
PUTNIBBLE((len << 2)|color);
|
|
} else if (len < 0x40) {
|
|
PUTNIBBLE(0);
|
|
PUTNIBBLE(len >> 2);
|
|
PUTNIBBLE((len << 2)|color);
|
|
} else if (x+len == w) {
|
|
PUTNIBBLE(0);
|
|
PUTNIBBLE(0);
|
|
PUTNIBBLE(0);
|
|
PUTNIBBLE(color);
|
|
} else {
|
|
if (len > 0xff)
|
|
len = 0xff;
|
|
PUTNIBBLE(0);
|
|
PUTNIBBLE(len >> 6);
|
|
PUTNIBBLE(len >> 2);
|
|
PUTNIBBLE((len << 2)|color);
|
|
}
|
|
}
|
|
/* end of line */
|
|
if (ncnt & 1)
|
|
PUTNIBBLE(0);
|
|
bitmap += linesize;
|
|
}
|
|
|
|
*pq = q;
|
|
}
|
|
|
|
static int encode_dvd_subtitles(uint8_t *outbuf, int outbuf_size,
|
|
const AVSubtitle *h)
|
|
{
|
|
uint8_t *q, *qq;
|
|
int object_id;
|
|
int offset1[20], offset2[20];
|
|
int i, imax, color, alpha, rects = h->num_rects;
|
|
unsigned long hmax;
|
|
unsigned long hist[256];
|
|
int cmap[256];
|
|
|
|
if (rects == 0 || h->rects == NULL)
|
|
return -1;
|
|
if (rects > 20)
|
|
rects = 20;
|
|
|
|
// analyze bitmaps, compress to 4 colors
|
|
for (i=0; i<256; ++i) {
|
|
hist[i] = 0;
|
|
cmap[i] = 0;
|
|
}
|
|
for (object_id = 0; object_id < rects; object_id++)
|
|
for (i=0; i<h->rects[object_id]->w*h->rects[object_id]->h; ++i) {
|
|
color = h->rects[object_id]->pict.data[0][i];
|
|
// only count non-transparent pixels
|
|
alpha = ((uint32_t*)h->rects[object_id]->pict.data[1])[color] >> 24;
|
|
hist[color] += alpha;
|
|
}
|
|
for (color=3;; --color) {
|
|
hmax = 0;
|
|
imax = 0;
|
|
for (i=0; i<256; ++i)
|
|
if (hist[i] > hmax) {
|
|
imax = i;
|
|
hmax = hist[i];
|
|
}
|
|
if (hmax == 0)
|
|
break;
|
|
if (color == 0)
|
|
color = 3;
|
|
av_log(NULL, AV_LOG_DEBUG, "dvd_subtitle hist[%d]=%ld -> col %d\n",
|
|
imax, hist[imax], color);
|
|
cmap[imax] = color;
|
|
hist[imax] = 0;
|
|
}
|
|
|
|
|
|
// encode data block
|
|
q = outbuf + 4;
|
|
for (object_id = 0; object_id < rects; object_id++) {
|
|
offset1[object_id] = q - outbuf;
|
|
// worst case memory requirement: 1 nibble per pixel..
|
|
if ((q - outbuf) + h->rects[object_id]->w*h->rects[object_id]->h/2
|
|
+ 17*rects + 21 > outbuf_size) {
|
|
av_log(NULL, AV_LOG_ERROR, "dvd_subtitle too big\n");
|
|
return -1;
|
|
}
|
|
dvd_encode_rle(&q, h->rects[object_id]->pict.data[0],
|
|
h->rects[object_id]->w*2,
|
|
h->rects[object_id]->w, h->rects[object_id]->h >> 1,
|
|
cmap);
|
|
offset2[object_id] = q - outbuf;
|
|
dvd_encode_rle(&q, h->rects[object_id]->pict.data[0] + h->rects[object_id]->w,
|
|
h->rects[object_id]->w*2,
|
|
h->rects[object_id]->w, h->rects[object_id]->h >> 1,
|
|
cmap);
|
|
}
|
|
|
|
// set data packet size
|
|
qq = outbuf + 2;
|
|
bytestream_put_be16(&qq, q - outbuf);
|
|
|
|
// send start display command
|
|
bytestream_put_be16(&q, (h->start_display_time*90) >> 10);
|
|
bytestream_put_be16(&q, (q - outbuf) /*- 2 */ + 8 + 12*rects + 2);
|
|
*q++ = 0x03; // palette - 4 nibbles
|
|
*q++ = 0x03; *q++ = 0x7f;
|
|
*q++ = 0x04; // alpha - 4 nibbles
|
|
*q++ = 0xf0; *q++ = 0x00;
|
|
//*q++ = 0x0f; *q++ = 0xff;
|
|
|
|
// XXX not sure if more than one rect can really be encoded..
|
|
// 12 bytes per rect
|
|
for (object_id = 0; object_id < rects; object_id++) {
|
|
int x2 = h->rects[object_id]->x + h->rects[object_id]->w - 1;
|
|
int y2 = h->rects[object_id]->y + h->rects[object_id]->h - 1;
|
|
|
|
*q++ = 0x05;
|
|
// x1 x2 -> 6 nibbles
|
|
*q++ = h->rects[object_id]->x >> 4;
|
|
*q++ = (h->rects[object_id]->x << 4) | ((x2 >> 8) & 0xf);
|
|
*q++ = x2;
|
|
// y1 y2 -> 6 nibbles
|
|
*q++ = h->rects[object_id]->y >> 4;
|
|
*q++ = (h->rects[object_id]->y << 4) | ((y2 >> 8) & 0xf);
|
|
*q++ = y2;
|
|
|
|
*q++ = 0x06;
|
|
// offset1, offset2
|
|
bytestream_put_be16(&q, offset1[object_id]);
|
|
bytestream_put_be16(&q, offset2[object_id]);
|
|
}
|
|
*q++ = 0x01; // start command
|
|
*q++ = 0xff; // terminating command
|
|
|
|
// send stop display command last
|
|
bytestream_put_be16(&q, (h->end_display_time*90) >> 10);
|
|
bytestream_put_be16(&q, (q - outbuf) - 2 /*+ 4*/);
|
|
*q++ = 0x02; // set end
|
|
*q++ = 0xff; // terminating command
|
|
|
|
qq = outbuf;
|
|
bytestream_put_be16(&qq, q - outbuf);
|
|
|
|
av_log(NULL, AV_LOG_DEBUG, "subtitle_packet size=%td\n", q - outbuf);
|
|
return q - outbuf;
|
|
}
|
|
|
|
static int dvdsub_encode(AVCodecContext *avctx,
|
|
unsigned char *buf, int buf_size, void *data)
|
|
{
|
|
//DVDSubtitleContext *s = avctx->priv_data;
|
|
AVSubtitle *sub = data;
|
|
int ret;
|
|
|
|
ret = encode_dvd_subtitles(buf, buf_size, sub);
|
|
return ret;
|
|
}
|
|
|
|
AVCodec dvdsub_encoder = {
|
|
"dvdsub",
|
|
AVMEDIA_TYPE_SUBTITLE,
|
|
CODEC_ID_DVD_SUBTITLE,
|
|
0,
|
|
NULL,
|
|
dvdsub_encode,
|
|
.long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
|
|
};
|