mirror of https://git.ffmpeg.org/ffmpeg.git
516 lines
16 KiB
C
516 lines
16 KiB
C
/*
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* DVB subtitle encoding
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* Copyright (c) 2005 Fabrice Bellard
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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 "avcodec.h"
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#include "bytestream.h"
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#include "libavutil/colorspace.h"
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typedef struct DVBSubtitleContext {
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int object_version;
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} DVBSubtitleContext;
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#define PUTBITS2(val)\
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{\
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bitbuf |= (val) << bitcnt;\
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bitcnt -= 2;\
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if (bitcnt < 0) {\
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bitcnt = 6;\
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*q++ = bitbuf;\
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bitbuf = 0;\
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}\
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}
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static int dvb_encode_rle2(uint8_t **pq, int buf_size,
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const uint8_t *bitmap, int linesize,
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int w, int h)
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{
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uint8_t *q, *line_begin;
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unsigned int bitbuf;
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int bitcnt;
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int x, y, len, x1, v, color;
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q = *pq;
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for(y = 0; y < h; y++) {
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// Worst case line is 3 bits per value + 4 bytes overhead
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if (buf_size * 8 < w * 3 + 32)
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return AVERROR_BUFFER_TOO_SMALL;
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line_begin = q;
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*q++ = 0x10;
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bitbuf = 0;
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bitcnt = 6;
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x = 0;
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while (x < w) {
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x1 = x;
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color = bitmap[x1++];
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while (x1 < w && bitmap[x1] == color)
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x1++;
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len = x1 - x;
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if (color == 0 && len == 2) {
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PUTBITS2(0);
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PUTBITS2(0);
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PUTBITS2(1);
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} else if (len >= 3 && len <= 10) {
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v = len - 3;
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PUTBITS2(0);
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PUTBITS2((v >> 2) | 2);
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PUTBITS2(v & 3);
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PUTBITS2(color);
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} else if (len >= 12 && len <= 27) {
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v = len - 12;
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PUTBITS2(0);
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PUTBITS2(0);
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PUTBITS2(2);
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PUTBITS2(v >> 2);
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PUTBITS2(v & 3);
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PUTBITS2(color);
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} else if (len >= 29) {
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/* length = 29 ... 284 */
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if (len > 284)
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len = 284;
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v = len - 29;
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PUTBITS2(0);
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PUTBITS2(0);
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PUTBITS2(3);
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PUTBITS2((v >> 6));
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PUTBITS2((v >> 4) & 3);
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PUTBITS2((v >> 2) & 3);
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PUTBITS2(v & 3);
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PUTBITS2(color);
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} else {
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PUTBITS2(color);
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if (color == 0) {
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PUTBITS2(1);
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}
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len = 1;
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}
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x += len;
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}
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/* end of line */
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PUTBITS2(0);
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PUTBITS2(0);
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PUTBITS2(0);
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if (bitcnt != 6) {
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*q++ = bitbuf;
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}
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*q++ = 0xf0;
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bitmap += linesize;
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buf_size -= q - line_begin;
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}
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len = q - *pq;
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*pq = q;
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return len;
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}
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#define PUTBITS4(val)\
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{\
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bitbuf |= (val) << bitcnt;\
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bitcnt -= 4;\
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if (bitcnt < 0) {\
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bitcnt = 4;\
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*q++ = bitbuf;\
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bitbuf = 0;\
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}\
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}
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/* some DVB decoders only implement 4 bits/pixel */
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static int dvb_encode_rle4(uint8_t **pq, int buf_size,
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const uint8_t *bitmap, int linesize,
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int w, int h)
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{
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uint8_t *q, *line_begin;
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unsigned int bitbuf;
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int bitcnt;
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int x, y, len, x1, v, color;
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q = *pq;
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for(y = 0; y < h; y++) {
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// Worst case line is 6 bits per value, + 4 bytes overhead
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if (buf_size * 8 < w * 6 + 32)
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return AVERROR_BUFFER_TOO_SMALL;
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line_begin = q;
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*q++ = 0x11;
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bitbuf = 0;
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bitcnt = 4;
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x = 0;
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while (x < w) {
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x1 = x;
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color = bitmap[x1++];
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while (x1 < w && bitmap[x1] == color)
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x1++;
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len = x1 - x;
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if (color == 0 && len == 2) {
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PUTBITS4(0);
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PUTBITS4(0xd);
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} else if (color == 0 && (len >= 3 && len <= 9)) {
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PUTBITS4(0);
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PUTBITS4(len - 2);
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} else if (len >= 4 && len <= 7) {
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PUTBITS4(0);
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PUTBITS4(8 + len - 4);
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PUTBITS4(color);
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} else if (len >= 9 && len <= 24) {
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PUTBITS4(0);
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PUTBITS4(0xe);
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PUTBITS4(len - 9);
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PUTBITS4(color);
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} else if (len >= 25) {
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if (len > 280)
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len = 280;
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v = len - 25;
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PUTBITS4(0);
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PUTBITS4(0xf);
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PUTBITS4(v >> 4);
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PUTBITS4(v & 0xf);
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PUTBITS4(color);
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} else {
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PUTBITS4(color);
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if (color == 0) {
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PUTBITS4(0xc);
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}
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len = 1;
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}
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x += len;
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}
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/* end of line */
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PUTBITS4(0);
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PUTBITS4(0);
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if (bitcnt != 4) {
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*q++ = bitbuf;
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}
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*q++ = 0xf0;
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bitmap += linesize;
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buf_size -= q - line_begin;
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}
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len = q - *pq;
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*pq = q;
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return len;
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}
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static int dvb_encode_rle8(uint8_t **pq, int buf_size,
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const uint8_t *bitmap, int linesize,
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int w, int h)
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{
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uint8_t *q, *line_begin;
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int x, y, len, x1, color;
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q = *pq;
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for (y = 0; y < h; y++) {
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// Worst case line is 12 bits per value, + 3 bytes overhead
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if (buf_size * 8 < w * 12 + 24)
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return AVERROR_BUFFER_TOO_SMALL;
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line_begin = q;
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*q++ = 0x12;
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x = 0;
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while (x < w) {
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x1 = x;
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color = bitmap[x1++];
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while (x1 < w && bitmap[x1] == color)
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x1++;
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len = x1 - x;
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if (len == 1 && color) {
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// 00000001 to 11111111 1 pixel in colour x
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*q++ = color;
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} else {
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if (color == 0x00) {
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// 00000000 0LLLLLLL L pixels (1-127) in colour 0 (L > 0)
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len = FFMIN(len, 127);
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*q++ = 0x00;
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*q++ = len;
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} else if (len > 2) {
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// 00000000 1LLLLLLL CCCCCCCC L pixels (3-127) in colour C (L > 2)
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len = FFMIN(len, 127);
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*q++ = 0x00;
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*q++ = 0x80+len;
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*q++ = color;
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}
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else if (len == 2) {
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*q++ = color;
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*q++ = color;
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} else {
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*q++ = color;
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len = 1;
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}
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}
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x += len;
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}
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/* end of line */
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// 00000000 end of 8-bit/pixel_code_string
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*q++ = 0x00;
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*q++ = 0xf0;
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bitmap += linesize;
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buf_size -= q - line_begin;
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}
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len = q - *pq;
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*pq = q;
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return len;
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}
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static int dvbsub_encode(AVCodecContext *avctx, uint8_t *outbuf, int buf_size,
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const AVSubtitle *h)
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{
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DVBSubtitleContext *s = avctx->priv_data;
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uint8_t *q, *pseg_len;
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int page_id, region_id, clut_id, object_id, i, bpp_index, page_state;
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q = outbuf;
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page_id = 1;
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if (h->num_rects && !h->rects)
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return AVERROR(EINVAL);
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if (avctx->width > 0 && avctx->height > 0) {
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if (buf_size < 11)
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return AVERROR_BUFFER_TOO_SMALL;
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/* display definition segment */
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*q++ = 0x0f; /* sync_byte */
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*q++ = 0x14; /* segment_type */
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bytestream_put_be16(&q, page_id);
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pseg_len = q;
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q += 2; /* segment length */
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*q++ = 0x00; /* dds version number & display window flag */
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bytestream_put_be16(&q, avctx->width - 1); /* display width */
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bytestream_put_be16(&q, avctx->height - 1); /* display height */
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bytestream_put_be16(&pseg_len, q - pseg_len - 2);
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buf_size -= 11;
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}
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/* page composition segment */
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if (buf_size < 8 + h->num_rects * 6)
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return AVERROR_BUFFER_TOO_SMALL;
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*q++ = 0x0f; /* sync_byte */
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*q++ = 0x10; /* segment_type */
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bytestream_put_be16(&q, page_id);
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pseg_len = q;
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q += 2; /* segment length */
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*q++ = 30; /* page_timeout (seconds) */
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page_state = 2; /* mode change */
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/* page_version = 0 + page_state */
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*q++ = (s->object_version << 4) | (page_state << 2) | 3;
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for (region_id = 0; region_id < h->num_rects; region_id++) {
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*q++ = region_id;
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*q++ = 0xff; /* reserved */
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bytestream_put_be16(&q, h->rects[region_id]->x); /* left pos */
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bytestream_put_be16(&q, h->rects[region_id]->y); /* top pos */
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}
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bytestream_put_be16(&pseg_len, q - pseg_len - 2);
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buf_size -= 8 + h->num_rects * 6;
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if (h->num_rects) {
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for (clut_id = 0; clut_id < h->num_rects; clut_id++) {
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if (buf_size < 6 + h->rects[clut_id]->nb_colors * 6)
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return AVERROR_BUFFER_TOO_SMALL;
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/* CLUT segment */
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if (h->rects[clut_id]->nb_colors <= 4) {
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/* 2 bpp, some decoders do not support it correctly */
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bpp_index = 0;
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} else if (h->rects[clut_id]->nb_colors <= 16) {
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/* 4 bpp, standard encoding */
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bpp_index = 1;
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} else if (h->rects[clut_id]->nb_colors <= 256) {
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/* 8 bpp, standard encoding */
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bpp_index = 2;
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} else {
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return AVERROR(EINVAL);
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}
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/* CLUT segment */
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*q++ = 0x0f; /* sync byte */
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*q++ = 0x12; /* CLUT definition segment */
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bytestream_put_be16(&q, page_id);
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pseg_len = q;
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q += 2; /* segment length */
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*q++ = clut_id;
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*q++ = (0 << 4) | 0xf; /* version = 0 */
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for(i = 0; i < h->rects[clut_id]->nb_colors; i++) {
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*q++ = i; /* clut_entry_id */
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*q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */
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{
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int a, r, g, b;
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uint32_t x= ((uint32_t*)h->rects[clut_id]->data[1])[i];
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a = (x >> 24) & 0xff;
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r = (x >> 16) & 0xff;
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g = (x >> 8) & 0xff;
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b = (x >> 0) & 0xff;
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*q++ = RGB_TO_Y_CCIR(r, g, b);
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*q++ = RGB_TO_V_CCIR(r, g, b, 0);
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*q++ = RGB_TO_U_CCIR(r, g, b, 0);
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*q++ = 255 - a;
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}
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}
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bytestream_put_be16(&pseg_len, q - pseg_len - 2);
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buf_size -= 6 + h->rects[clut_id]->nb_colors * 6;
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}
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if (buf_size < h->num_rects * 22)
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return AVERROR_BUFFER_TOO_SMALL;
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for (region_id = 0; region_id < h->num_rects; region_id++) {
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/* region composition segment */
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if (h->rects[region_id]->nb_colors <= 4) {
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/* 2 bpp, some decoders do not support it correctly */
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bpp_index = 0;
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} else if (h->rects[region_id]->nb_colors <= 16) {
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/* 4 bpp, standard encoding */
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bpp_index = 1;
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} else if (h->rects[region_id]->nb_colors <= 256) {
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/* 8 bpp, standard encoding */
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bpp_index = 2;
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} else {
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return AVERROR(EINVAL);
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}
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*q++ = 0x0f; /* sync_byte */
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*q++ = 0x11; /* segment_type */
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bytestream_put_be16(&q, page_id);
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pseg_len = q;
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q += 2; /* segment length */
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*q++ = region_id;
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*q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */
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bytestream_put_be16(&q, h->rects[region_id]->w); /* region width */
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bytestream_put_be16(&q, h->rects[region_id]->h); /* region height */
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*q++ = ((1 + bpp_index) << 5) | ((1 + bpp_index) << 2) | 0x03;
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*q++ = region_id; /* clut_id == region_id */
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*q++ = 0; /* 8 bit fill colors */
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*q++ = 0x03; /* 4 bit and 2 bit fill colors */
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bytestream_put_be16(&q, region_id); /* object_id == region_id */
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*q++ = (0 << 6) | (0 << 4);
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*q++ = 0;
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*q++ = 0xf0;
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*q++ = 0;
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bytestream_put_be16(&pseg_len, q - pseg_len - 2);
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}
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buf_size -= h->num_rects * 22;
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for (object_id = 0; object_id < h->num_rects; object_id++) {
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int (*dvb_encode_rle)(uint8_t **pq, int buf_size,
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const uint8_t *bitmap, int linesize,
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int w, int h);
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if (buf_size < 13)
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return AVERROR_BUFFER_TOO_SMALL;
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/* bpp_index maths */
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if (h->rects[object_id]->nb_colors <= 4) {
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/* 2 bpp, some decoders do not support it correctly */
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dvb_encode_rle = dvb_encode_rle2;
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} else if (h->rects[object_id]->nb_colors <= 16) {
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/* 4 bpp, standard encoding */
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dvb_encode_rle = dvb_encode_rle4;
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} else if (h->rects[object_id]->nb_colors <= 256) {
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/* 8 bpp, standard encoding */
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dvb_encode_rle = dvb_encode_rle8;
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} else {
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return AVERROR(EINVAL);
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}
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/* Object Data segment */
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*q++ = 0x0f; /* sync byte */
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*q++ = 0x13;
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bytestream_put_be16(&q, page_id);
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pseg_len = q;
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q += 2; /* segment length */
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bytestream_put_be16(&q, object_id);
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*q++ = (s->object_version << 4) | (0 << 2) | (0 << 1) | 1; /* version = 0,
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object_coding_method,
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non_modifying_color_flag */
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{
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uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr;
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int ret;
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ptop_field_len = q;
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q += 2;
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pbottom_field_len = q;
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q += 2;
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buf_size -= 13;
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top_ptr = q;
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ret = dvb_encode_rle(&q, buf_size,
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h->rects[object_id]->data[0],
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h->rects[object_id]->w * 2,
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h->rects[object_id]->w,
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h->rects[object_id]->h >> 1);
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if (ret < 0)
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return ret;
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buf_size -= ret;
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bottom_ptr = q;
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ret = dvb_encode_rle(&q, buf_size,
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h->rects[object_id]->data[0] + h->rects[object_id]->w,
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h->rects[object_id]->w * 2,
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h->rects[object_id]->w,
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h->rects[object_id]->h >> 1);
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if (ret < 0)
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return ret;
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buf_size -= ret;
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bytestream_put_be16(&ptop_field_len, bottom_ptr - top_ptr);
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bytestream_put_be16(&pbottom_field_len, q - bottom_ptr);
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}
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bytestream_put_be16(&pseg_len, q - pseg_len - 2);
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}
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}
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/* end of display set segment */
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if (buf_size < 6)
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return AVERROR_BUFFER_TOO_SMALL;
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*q++ = 0x0f; /* sync_byte */
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*q++ = 0x80; /* segment_type */
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bytestream_put_be16(&q, page_id);
|
|
pseg_len = q;
|
|
q += 2; /* segment length */
|
|
|
|
bytestream_put_be16(&pseg_len, q - pseg_len - 2);
|
|
buf_size -= 6;
|
|
|
|
s->object_version = (s->object_version + 1) & 0xf;
|
|
return q - outbuf;
|
|
}
|
|
|
|
AVCodec ff_dvbsub_encoder = {
|
|
.name = "dvbsub",
|
|
.long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
|
|
.type = AVMEDIA_TYPE_SUBTITLE,
|
|
.id = AV_CODEC_ID_DVB_SUBTITLE,
|
|
.priv_data_size = sizeof(DVBSubtitleContext),
|
|
.encode_sub = dvbsub_encode,
|
|
};
|