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/* |
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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.
*
* 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
* 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
* 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 |
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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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*/
#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 {
int hide_state;
int object_version;
} DVBSubtitleContext;
#define PUTBITS2(val)\
{\
bitbuf |= (val) << bitcnt;\
bitcnt -= 2;\
if (bitcnt < 0) {\
bitcnt = 6;\
*q++ = bitbuf;\
bitbuf = 0;\
}\
}
static void dvb_encode_rle2(uint8_t **pq,
const uint8_t *bitmap, int linesize,
int w, int h)
{
uint8_t *q;
unsigned int bitbuf;
int bitcnt;
int x, y, len, x1, v, color;
q = *pq; |
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|
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for(y = 0; y < h; y++) {
*q++ = 0x10;
bitbuf = 0;
bitcnt = 6; |
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|
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x = 0;
while (x < w) {
x1 = x;
color = bitmap[x1++];
while (x1 < w && bitmap[x1] == color)
x1++;
len = x1 - x;
if (color == 0 && len == 2) {
PUTBITS2(0);
PUTBITS2(0);
PUTBITS2(1);
} else if (len >= 3 && len <= 10) {
v = len - 3;
PUTBITS2(0);
PUTBITS2((v >> 2) | 2);
PUTBITS2(v & 3);
PUTBITS2(color);
} else if (len >= 12 && len <= 27) {
v = len - 12;
PUTBITS2(0);
PUTBITS2(0);
PUTBITS2(2);
PUTBITS2(v >> 2);
PUTBITS2(v & 3);
PUTBITS2(color);
} else if (len >= 29) {
/* length = 29 ... 284 */
if (len > 284)
len = 284;
v = len - 29;
PUTBITS2(0);
PUTBITS2(0);
PUTBITS2(3);
PUTBITS2((v >> 6));
PUTBITS2((v >> 4) & 3);
PUTBITS2((v >> 2) & 3);
PUTBITS2(v & 3);
PUTBITS2(color);
} else {
PUTBITS2(color);
if (color == 0) {
PUTBITS2(1);
}
len = 1;
}
x += len;
}
/* end of line */
PUTBITS2(0);
PUTBITS2(0);
PUTBITS2(0);
if (bitcnt != 6) {
*q++ = bitbuf;
}
*q++ = 0xf0;
bitmap += linesize;
}
*pq = q;
}
#define PUTBITS4(val)\
{\
bitbuf |= (val) << bitcnt;\
bitcnt -= 4;\
if (bitcnt < 0) {\
bitcnt = 4;\
*q++ = bitbuf;\
bitbuf = 0;\
}\
}
/* some DVB decoders only implement 4 bits/pixel */
static void dvb_encode_rle4(uint8_t **pq,
const uint8_t *bitmap, int linesize,
int w, int h)
{
uint8_t *q;
unsigned int bitbuf;
int bitcnt;
int x, y, len, x1, v, color;
q = *pq; |
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|
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for(y = 0; y < h; y++) {
*q++ = 0x11;
bitbuf = 0;
bitcnt = 4; |
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|
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x = 0;
while (x < w) {
x1 = x;
color = bitmap[x1++];
while (x1 < w && bitmap[x1] == color)
x1++;
len = x1 - x;
if (color == 0 && len == 2) {
PUTBITS4(0);
PUTBITS4(0xd);
} else if (color == 0 && (len >= 3 && len <= 9)) {
PUTBITS4(0);
PUTBITS4(len - 2);
} else if (len >= 4 && len <= 7) {
PUTBITS4(0);
PUTBITS4(8 + len - 4);
PUTBITS4(color);
} else if (len >= 9 && len <= 24) {
PUTBITS4(0);
PUTBITS4(0xe);
PUTBITS4(len - 9);
PUTBITS4(color);
} else if (len >= 25) {
if (len > 280)
len = 280;
v = len - 25;
PUTBITS4(0);
PUTBITS4(0xf);
PUTBITS4(v >> 4);
PUTBITS4(v & 0xf);
PUTBITS4(color);
} else {
PUTBITS4(color);
if (color == 0) {
PUTBITS4(0xc);
}
len = 1;
}
x += len;
}
/* end of line */
PUTBITS4(0);
PUTBITS4(0);
if (bitcnt != 4) {
*q++ = bitbuf;
}
*q++ = 0xf0;
bitmap += linesize;
}
*pq = q;
}
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static void dvb_encode_rle8(uint8_t **pq,
const uint8_t *bitmap, int linesize,
int w, int h)
{
uint8_t *q;
int x, y, len, x1, f, color;
q = *pq;
for (y = 0; y < h; y++) {
*q++ = 0x12;
x = 0;
f = 0;
while (x < w) {
x1 = x;
color = bitmap[x1++];
while (x1 < w && bitmap[x1] == color)
x1++;
len = x1 - x;
if (len == 1 && color) {
// 00000001 to 11111111 1 pixel in colour x
*q++ = color;
} else {
if (color == 0x00) {
// 00000000 0LLLLLLL L pixels (1-127) in colour 0 (L > 0)
len = FFMIN(len, 127);
*q++ = 0x00;
*q++ = len;
} else if (len > 2) {
// 00000000 1LLLLLLL CCCCCCCC L pixels (3-127) in colour C (L > 2)
len = FFMIN(len, 127);
*q++ = 0x00;
*q++ = 0x80+len;
*q++ = color;
}
else if (len == 2) {
*q++ = color;
*q++ = color;
} else {
*q++ = color;
len = 1;
}
}
x += len;
}
/* end of line */
// 00000000 00000000 end of 8-bit/pixel_code_string
*q++ = 0x00;
*q++ = 0x00;
bitmap += linesize;
}
*pq = q;
}
|
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static int encode_dvb_subtitles(DVBSubtitleContext *s, |
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uint8_t *outbuf, AVSubtitle *h)
{
uint8_t *q, *pseg_len;
int page_id, region_id, clut_id, object_id, i, bpp_index, page_state;
q = outbuf;
page_id = 1; |
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if (h->num_rects == 0 || h->rects == NULL) |
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return -1;
*q++ = 0x00; /* subtitle_stream_id */
/* page composition segment */
*q++ = 0x0f; /* sync_byte */
*q++ = 0x10; /* segment_type */ |
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bytestream_put_be16(&q, page_id); |
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pseg_len = q;
q += 2; /* segment length */
*q++ = 30; /* page_timeout (seconds) */
if (s->hide_state)
page_state = 0; /* normal case */
else
page_state = 2; /* mode change */
/* 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++) {
*q++ = region_id;
*q++ = 0xff; /* reserved */ |
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bytestream_put_be16(&q, h->rects[region_id]->x); /* left pos */
bytestream_put_be16(&q, h->rects[region_id]->y); /* top pos */ |
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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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if (!s->hide_state) { |
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for (clut_id = 0; clut_id < h->num_rects; clut_id++) {
/* 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 */
bpp_index = 0; |
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} else if (h->rects[clut_id]->nb_colors <= 16) { |
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/* 4 bpp, standard encoding */
bpp_index = 1; |
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} else if (h->rects[clut_id]->nb_colors <= 256) {
/* 8 bpp, standard encoding */
bpp_index = 2; |
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} else {
return -1;
}
|
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/* CLUT segment */ |
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*q++ = 0x0f; /* sync byte */
*q++ = 0x12; /* CLUT definition segment */ |
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bytestream_put_be16(&q, page_id); |
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pseg_len = q;
q += 2; /* segment length */
*q++ = clut_id;
*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 */
*q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */
{
int a, r, g, b; |
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uint32_t x= ((uint32_t*)h->rects[clut_id]->pict.data[1])[i];
a = (x >> 24) & 0xff;
r = (x >> 16) & 0xff;
g = (x >> 8) & 0xff;
b = (x >> 0) & 0xff; |
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*q++ = RGB_TO_Y_CCIR(r, g, b);
*q++ = RGB_TO_V_CCIR(r, g, b, 0);
*q++ = RGB_TO_U_CCIR(r, g, b, 0);
*q++ = 255 - a;
}
}
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bytestream_put_be16(&pseg_len, q - pseg_len - 2); |
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}
}
for (region_id = 0; region_id < h->num_rects; region_id++) {
/* region composition segment */ |
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|
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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 */
bpp_index = 0; |
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} else if (h->rects[region_id]->nb_colors <= 16) { |
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/* 4 bpp, standard encoding */
bpp_index = 1;
} else {
return -1;
}
*q++ = 0x0f; /* sync_byte */
*q++ = 0x11; /* segment_type */ |
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bytestream_put_be16(&q, page_id); |
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pseg_len = q;
q += 2; /* segment length */ |
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*q++ = region_id;
*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 */
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;
*q++ = region_id; /* clut_id == region_id */
*q++ = 0; /* 8 bit fill colors */
*q++ = 0x03; /* 4 bit and 2 bit fill colors */
if (!s->hide_state) { |
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bytestream_put_be16(&q, region_id); /* object_id == region_id */ |
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*q++ = (0 << 6) | (0 << 4);
*q++ = 0;
*q++ = 0xf0;
*q++ = 0; |
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}
|
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bytestream_put_be16(&pseg_len, q - pseg_len - 2); |
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}
if (!s->hide_state) { |
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|
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for (object_id = 0; object_id < h->num_rects; object_id++) { |
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void (*dvb_encode_rle)(uint8_t **pq,
const uint8_t *bitmap, int linesize,
int w, int h); |
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|
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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) {
/* 8 bpp, standard encoding */
dvb_encode_rle = dvb_encode_rle8; |
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} else {
return -1;
} |
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|
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/* Object Data segment */ |
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*q++ = 0x0f; /* sync byte */
*q++ = 0x13; |
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bytestream_put_be16(&q, page_id); |
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pseg_len = q;
q += 2; /* segment length */ |
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|
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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,
onject_coding_method,
non_modifying_color_flag */
{
uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr; |
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|
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ptop_field_len = q;
q += 2;
pbottom_field_len = q;
q += 2;
top_ptr = q; |
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dvb_encode_rle(&q, h->rects[object_id]->pict.data[0], h->rects[object_id]->w * 2, |
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h->rects[object_id]->w, h->rects[object_id]->h >> 1); |
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bottom_ptr = q; |
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dvb_encode_rle(&q, h->rects[object_id]->pict.data[0] + h->rects[object_id]->w, |
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h->rects[object_id]->w * 2, h->rects[object_id]->w,
h->rects[object_id]->h >> 1); |
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|
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bytestream_put_be16(&ptop_field_len, bottom_ptr - top_ptr);
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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}
/* end of display set segment */
*q++ = 0x0f; /* sync_byte */
*q++ = 0x80; /* segment_type */ |
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bytestream_put_be16(&q, page_id); |
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pseg_len = q;
q += 2; /* segment length */
|
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bytestream_put_be16(&pseg_len, q - pseg_len - 2); |
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*q++ = 0xff; /* end of PES data */
s->object_version = (s->object_version + 1) & 0xf;
s->hide_state = !s->hide_state;
return q - outbuf;
}
static int dvbsub_encode(AVCodecContext *avctx,
unsigned char *buf, int buf_size, void *data)
{
DVBSubtitleContext *s = avctx->priv_data;
AVSubtitle *sub = data;
int ret;
ret = encode_dvb_subtitles(s, buf, sub);
return ret;
}
|
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AVCodec ff_dvbsub_encoder = { |
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.name = "dvbsub",
.type = AVMEDIA_TYPE_SUBTITLE,
.id = CODEC_ID_DVB_SUBTITLE,
.priv_data_size = sizeof(DVBSubtitleContext),
.encode = dvbsub_encode, |
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.long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"), |
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}; |