/src/ffmpeg/libavcodec/dvbsubenc.c

Source (jump to first uncovered line)
/*
 * DVB subtitle encoding
 * Copyright (c) 2005 Fabrice Bellard
 *
 * 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"
#include "codec_internal.h"
#include "libavutil/colorspace.h"

typedef struct DVBSubtitleContext {
    int object_version;
} DVBSubtitleContext;

#define PUTBITS2(val)\
{\
    bitbuf |= (val) << bitcnt;\
    bitcnt -= 2;\
    if (bitcnt < 0) {\
        bitcnt = 6;\
        *q++ = bitbuf;\
        bitbuf = 0;\
    }\
}

static int dvb_encode_rle2(uint8_t **pq, int buf_size,
                           const uint8_t *bitmap, int linesize,
                           int w, int h)
{
    uint8_t *q, *line_begin;
    unsigned int bitbuf;
    int bitcnt;
    int x, y, len, x1, v, color;

    q = *pq;

    for(y = 0; y < h; y++) {
        // Worst case line is 3 bits per value + 4 bytes overhead
        if (buf_size * 8 < w * 3 + 32)
            return AVERROR_BUFFER_TOO_SMALL;
        line_begin = q;
        *q++ = 0x10;
        bitbuf = 0;
        bitcnt = 6;

        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;
        buf_size -= q - line_begin;
    }
    len = q - *pq;
    *pq = q;
    return len;
}

#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 int dvb_encode_rle4(uint8_t **pq, int buf_size,
                           const uint8_t *bitmap, int linesize,
                           int w, int h)
{
    uint8_t *q, *line_begin;
    unsigned int bitbuf;
    int bitcnt;
    int x, y, len, x1, v, color;

    q = *pq;

    for(y = 0; y < h; y++) {
        // Worst case line is 6 bits per value, + 4 bytes overhead
        if (buf_size * 8 < w * 6 + 32)
            return AVERROR_BUFFER_TOO_SMALL;
        line_begin = q;
        *q++ = 0x11;
        bitbuf = 0;
        bitcnt = 4;

        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;
        buf_size -= q - line_begin;
    }
    len = q - *pq;
    *pq = q;
    return len;
}

static int dvb_encode_rle8(uint8_t **pq, int buf_size,
                           const uint8_t *bitmap, int linesize,
                           int w, int h)
{
    uint8_t *q, *line_begin;
    int x, y, len, x1, color;

    q = *pq;

    for (y = 0; y < h; y++) {
        // Worst case line is 12 bits per value, + 3 bytes overhead
        if (buf_size * 8 < w * 12 + 24)
            return AVERROR_BUFFER_TOO_SMALL;
        line_begin = q;
        *q++ = 0x12;

        x = 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 end of 8-bit/pixel_code_string
        *q++ = 0x00;
        *q++ = 0xf0;
        bitmap += linesize;
        buf_size -= q - line_begin;
    }
    len = q - *pq;
    *pq = q;
    return len;
}

static int dvbsub_encode(AVCodecContext *avctx, uint8_t *outbuf, int buf_size,
                         const AVSubtitle *h)
{
    DVBSubtitleContext *s = avctx->priv_data;
    uint8_t *q, *pseg_len;
    int page_id, region_id, clut_id, object_id, i, bpp_index, page_state;


    q = outbuf;

    page_id = 1;

    if (h->num_rects && !h->rects)
        return AVERROR(EINVAL);

    if (avctx->width > 0 && avctx->height > 0) {
        if (buf_size < 11)
            return AVERROR_BUFFER_TOO_SMALL;
        /* display definition segment */
        *q++ = 0x0f; /* sync_byte */
        *q++ = 0x14; /* segment_type */
        bytestream_put_be16(&q, page_id);
        pseg_len = q;
        q += 2; /* segment length */
        *q++ = 0x00; /* dds version number & display window flag */
        bytestream_put_be16(&q, avctx->width - 1); /* display width */
        bytestream_put_be16(&q, avctx->height - 1); /* display height */
        bytestream_put_be16(&pseg_len, q - pseg_len - 2);
        buf_size -= 11;
    }

    /* page composition segment */

    if (buf_size < 8 + h->num_rects * 6)
        return AVERROR_BUFFER_TOO_SMALL;
    *q++ = 0x0f; /* sync_byte */
    *q++ = 0x10; /* segment_type */
    bytestream_put_be16(&q, page_id);
    pseg_len = q;
    q += 2; /* segment length */
    *q++ = 30; /* page_timeout (seconds) */
    page_state = 2; /* mode change */
    /* page_version = 0 + page_state */
    *q++ = (s->object_version << 4) | (page_state << 2) | 3;

    for (region_id = 0; region_id < h->num_rects; region_id++) {
        *q++ = region_id;
        *q++ = 0xff; /* reserved */
        bytestream_put_be16(&q, h->rects[region_id]->x); /* left pos */
        bytestream_put_be16(&q, h->rects[region_id]->y); /* top pos */
    }

    bytestream_put_be16(&pseg_len, q - pseg_len - 2);
    buf_size -= 8 + h->num_rects * 6;

    if (h->num_rects) {
        for (clut_id = 0; clut_id < h->num_rects; clut_id++) {
            if (buf_size < 6 + h->rects[clut_id]->nb_colors * 6)
                return AVERROR_BUFFER_TOO_SMALL;

            /* CLUT segment */

            if (h->rects[clut_id]->nb_colors <= 4) {
                /* 2 bpp, some decoders do not support it correctly */
                bpp_index = 0;
            } else if (h->rects[clut_id]->nb_colors <= 16) {
                /* 4 bpp, standard encoding */
                bpp_index = 1;
            } else if (h->rects[clut_id]->nb_colors <= 256) {
                /* 8 bpp, standard encoding */
                bpp_index = 2;
            } else {
                return AVERROR(EINVAL);
            }


            /* CLUT segment */
            *q++ = 0x0f; /* sync byte */
            *q++ = 0x12; /* CLUT definition segment */
            bytestream_put_be16(&q, page_id);
            pseg_len = q;
            q += 2; /* segment length */
            *q++ = clut_id;
            *q++ = (0 << 4) | 0xf; /* version = 0 */

            for(i = 0; i < h->rects[clut_id]->nb_colors; i++) {
                *q++ = i; /* clut_entry_id */
                *q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */
                {
                    int a, r, g, b;
                    uint32_t x= ((uint32_t*)h->rects[clut_id]->data[1])[i];
                    a = (x >> 24) & 0xff;
                    r = (x >> 16) & 0xff;
                    g = (x >>  8) & 0xff;
                    b = (x >>  0) & 0xff;

                    *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;
                }
            }

            bytestream_put_be16(&pseg_len, q - pseg_len - 2);
            buf_size -= 6 + h->rects[clut_id]->nb_colors * 6;
        }

        if (buf_size < h->num_rects * 22)
            return AVERROR_BUFFER_TOO_SMALL;
        for (region_id = 0; region_id < h->num_rects; region_id++) {

            /* region composition segment */

            if (h->rects[region_id]->nb_colors <= 4) {
                /* 2 bpp, some decoders do not support it correctly */
                bpp_index = 0;
            } else if (h->rects[region_id]->nb_colors <= 16) {
                /* 4 bpp, standard encoding */
                bpp_index = 1;
            } else if (h->rects[region_id]->nb_colors <= 256) {
                /* 8 bpp, standard encoding */
                bpp_index = 2;
            } else {
                return AVERROR(EINVAL);
            }

            *q++ = 0x0f; /* sync_byte */
            *q++ = 0x11; /* segment_type */
            bytestream_put_be16(&q, page_id);
            pseg_len = q;
            q += 2; /* segment length */
            *q++ = region_id;
            *q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */
            bytestream_put_be16(&q, h->rects[region_id]->w); /* region width */
            bytestream_put_be16(&q, h->rects[region_id]->h); /* region height */
            *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 */

            bytestream_put_be16(&q, region_id); /* object_id == region_id */
            *q++ = (0 << 6) | (0 << 4);
            *q++ = 0;
            *q++ = 0xf0;
            *q++ = 0;

            bytestream_put_be16(&pseg_len, q - pseg_len - 2);
        }
        buf_size -= h->num_rects * 22;

        for (object_id = 0; object_id < h->num_rects; object_id++) {
            int (*dvb_encode_rle)(uint8_t **pq, int buf_size,
                                  const uint8_t *bitmap, int linesize,
                                  int w, int h);

            if (buf_size < 13)
                return AVERROR_BUFFER_TOO_SMALL;

            /* bpp_index maths */
            if (h->rects[object_id]->nb_colors <= 4) {
                /* 2 bpp, some decoders do not support it correctly */
                dvb_encode_rle = dvb_encode_rle2;
            } else if (h->rects[object_id]->nb_colors <= 16) {
                /* 4 bpp, standard encoding */
                dvb_encode_rle = dvb_encode_rle4;
            } else if (h->rects[object_id]->nb_colors <= 256) {
                /* 8 bpp, standard encoding */
                dvb_encode_rle = dvb_encode_rle8;
            } else {
                return AVERROR(EINVAL);
            }

            /* Object Data segment */
            *q++ = 0x0f; /* sync byte */
            *q++ = 0x13;
            bytestream_put_be16(&q, page_id);
            pseg_len = q;
            q += 2; /* segment length */

            bytestream_put_be16(&q, object_id);
            *q++ = (s->object_version << 4) | (0 << 2) | (0 << 1) | 1; /* version = 0,
                                                                       object_coding_method,
                                                                       non_modifying_color_flag */
            {
                uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr;
                int ret;

                ptop_field_len = q;
                q += 2;
                pbottom_field_len = q;
                q += 2;
                buf_size -= 13;

                top_ptr = q;
                ret = dvb_encode_rle(&q, buf_size,
                                     h->rects[object_id]->data[0],
                                     h->rects[object_id]->w * 2,
                                     h->rects[object_id]->w,
                                     h->rects[object_id]->h >> 1);
                if (ret < 0)
                    return ret;
                buf_size -= ret;
                bottom_ptr = q;
                ret = dvb_encode_rle(&q, buf_size,
                                     h->rects[object_id]->data[0] + h->rects[object_id]->w,
                                     h->rects[object_id]->w * 2,
                                     h->rects[object_id]->w,
                                     h->rects[object_id]->h >> 1);
                if (ret < 0)
                    return ret;
                buf_size -= ret;

                bytestream_put_be16(&ptop_field_len, bottom_ptr - top_ptr);
                bytestream_put_be16(&pbottom_field_len, q - bottom_ptr);
            }

            bytestream_put_be16(&pseg_len, q - pseg_len - 2);
        }
    }

    /* end of display set segment */

    if (buf_size < 6)
        return AVERROR_BUFFER_TOO_SMALL;
    *q++ = 0x0f; /* sync_byte */
    *q++ = 0x80; /* segment_type */
    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;
}

const FFCodec ff_dvbsub_encoder = {
    .p.name         = "dvbsub",
    CODEC_LONG_NAME("DVB subtitles"),
    .p.type         = AVMEDIA_TYPE_SUBTITLE,
    .p.id           = AV_CODEC_ID_DVB_SUBTITLE,
    .priv_data_size = sizeof(DVBSubtitleContext),
    FF_CODEC_ENCODE_SUB_CB(dvbsub_encode),
};

Coverage Report

Created: 2024-09-06 07:53

Line	Count	Source (jump to first uncovered line)
1		/*
2		* DVB subtitle encoding
3		* Copyright (c) 2005 Fabrice Bellard
4		*
5		* This file is part of FFmpeg.
6		*
7		* FFmpeg is free software; you can redistribute it and/or
8		* modify it under the terms of the GNU Lesser General Public
9		* License as published by the Free Software Foundation; either
10		* version 2.1 of the License, or (at your option) any later version.
11		*
12		* FFmpeg is distributed in the hope that it will be useful,
13		* but WITHOUT ANY WARRANTY; without even the implied warranty of
14		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15		* Lesser General Public License for more details.
16		*
17		* You should have received a copy of the GNU Lesser General Public
18		* License along with FFmpeg; if not, write to the Free Software
19		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20		*/
21		#include "avcodec.h"
22		#include "bytestream.h"
23		#include "codec_internal.h"
24		#include "libavutil/colorspace.h"
25
26		typedef struct DVBSubtitleContext {
27		int object_version;
28		} DVBSubtitleContext;
29
30	0	#define PUTBITS2(val)\
31	0	{\
32	0	bitbuf \|= (val) << bitcnt;\
33	0	bitcnt -= 2;\
34	0	if (bitcnt < 0) {\
35	0	bitcnt = 6;\
36	0	*q++ = bitbuf;\
37	0	bitbuf = 0;\
38	0	}\
39	0	}
40
41		static int dvb_encode_rle2(uint8_t **pq, int buf_size,
42		const uint8_t *bitmap, int linesize,
43		int w, int h)
44	0	{
45	0	uint8_t q, line_begin;
46	0	unsigned int bitbuf;
47	0	int bitcnt;
48	0	int x, y, len, x1, v, color;
49
50	0	q = *pq;
51
52	0	for(y = 0; y < h; y++) {
53		// Worst case line is 3 bits per value + 4 bytes overhead
54	0	if (buf_size * 8 < w * 3 + 32)
55	0	return AVERROR_BUFFER_TOO_SMALL;
56	0	line_begin = q;
57	0	*q++ = 0x10;
58	0	bitbuf = 0;
59	0	bitcnt = 6;
60
61	0	x = 0;
62	0	while (x < w) {
63	0	x1 = x;
64	0	color = bitmap[x1++];
65	0	while (x1 < w && bitmap[x1] == color)
66	0	x1++;
67	0	len = x1 - x;
68	0	if (color == 0 && len == 2) {
69	0	PUTBITS2(0);
70	0	PUTBITS2(0);
71	0	PUTBITS2(1);
72	0	} else if (len >= 3 && len <= 10) {
73	0	v = len - 3;
74	0	PUTBITS2(0);
75	0	PUTBITS2((v >> 2) \| 2);
76	0	PUTBITS2(v & 3);
77	0	PUTBITS2(color);
78	0	} else if (len >= 12 && len <= 27) {
79	0	v = len - 12;
80	0	PUTBITS2(0);
81	0	PUTBITS2(0);
82	0	PUTBITS2(2);
83	0	PUTBITS2(v >> 2);
84	0	PUTBITS2(v & 3);
85	0	PUTBITS2(color);
86	0	} else if (len >= 29) {
87		/* length = 29 ... 284 */
88	0	if (len > 284)
89	0	len = 284;
90	0	v = len - 29;
91	0	PUTBITS2(0);
92	0	PUTBITS2(0);
93	0	PUTBITS2(3);
94	0	PUTBITS2((v >> 6));
95	0	PUTBITS2((v >> 4) & 3);
96	0	PUTBITS2((v >> 2) & 3);
97	0	PUTBITS2(v & 3);
98	0	PUTBITS2(color);
99	0	} else {
100	0	PUTBITS2(color);
101	0	if (color == 0) {
102	0	PUTBITS2(1);
103	0	}
104	0	len = 1;
105	0	}
106	0	x += len;
107	0	}
108		/* end of line */
109	0	PUTBITS2(0);
110	0	PUTBITS2(0);
111	0	PUTBITS2(0);
112	0	if (bitcnt != 6) {
113	0	*q++ = bitbuf;
114	0	}
115	0	*q++ = 0xf0;
116	0	bitmap += linesize;
117	0	buf_size -= q - line_begin;
118	0	}
119	0	len = q - *pq;
120	0	*pq = q;
121	0	return len;
122	0	}
123
124	0	#define PUTBITS4(val)\
125	0	{\
126	0	bitbuf \|= (val) << bitcnt;\
127	0	bitcnt -= 4;\
128	0	if (bitcnt < 0) {\
129	0	bitcnt = 4;\
130	0	*q++ = bitbuf;\
131	0	bitbuf = 0;\
132	0	}\
133	0	}
134
135		/* some DVB decoders only implement 4 bits/pixel */
136		static int dvb_encode_rle4(uint8_t **pq, int buf_size,
137		const uint8_t *bitmap, int linesize,
138		int w, int h)
139	0	{
140	0	uint8_t q, line_begin;
141	0	unsigned int bitbuf;
142	0	int bitcnt;
143	0	int x, y, len, x1, v, color;
144
145	0	q = *pq;
146
147	0	for(y = 0; y < h; y++) {
148		// Worst case line is 6 bits per value, + 4 bytes overhead
149	0	if (buf_size * 8 < w * 6 + 32)
150	0	return AVERROR_BUFFER_TOO_SMALL;
151	0	line_begin = q;
152	0	*q++ = 0x11;
153	0	bitbuf = 0;
154	0	bitcnt = 4;
155
156	0	x = 0;
157	0	while (x < w) {
158	0	x1 = x;
159	0	color = bitmap[x1++];
160	0	while (x1 < w && bitmap[x1] == color)
161	0	x1++;
162	0	len = x1 - x;
163	0	if (color == 0 && len == 2) {
164	0	PUTBITS4(0);
165	0	PUTBITS4(0xd);
166	0	} else if (color == 0 && (len >= 3 && len <= 9)) {
167	0	PUTBITS4(0);
168	0	PUTBITS4(len - 2);
169	0	} else if (len >= 4 && len <= 7) {
170	0	PUTBITS4(0);
171	0	PUTBITS4(8 + len - 4);
172	0	PUTBITS4(color);
173	0	} else if (len >= 9 && len <= 24) {
174	0	PUTBITS4(0);
175	0	PUTBITS4(0xe);
176	0	PUTBITS4(len - 9);
177	0	PUTBITS4(color);
178	0	} else if (len >= 25) {
179	0	if (len > 280)
180	0	len = 280;
181	0	v = len - 25;
182	0	PUTBITS4(0);
183	0	PUTBITS4(0xf);
184	0	PUTBITS4(v >> 4);
185	0	PUTBITS4(v & 0xf);
186	0	PUTBITS4(color);
187	0	} else {
188	0	PUTBITS4(color);
189	0	if (color == 0) {
190	0	PUTBITS4(0xc);
191	0	}
192	0	len = 1;
193	0	}
194	0	x += len;
195	0	}
196		/* end of line */
197	0	PUTBITS4(0);
198	0	PUTBITS4(0);
199	0	if (bitcnt != 4) {
200	0	*q++ = bitbuf;
201	0	}
202	0	*q++ = 0xf0;
203	0	bitmap += linesize;
204	0	buf_size -= q - line_begin;
205	0	}
206	0	len = q - *pq;
207	0	*pq = q;
208	0	return len;
209	0	}
210
211		static int dvb_encode_rle8(uint8_t **pq, int buf_size,
212		const uint8_t *bitmap, int linesize,
213		int w, int h)
214	0	{
215	0	uint8_t q, line_begin;
216	0	int x, y, len, x1, color;
217
218	0	q = *pq;
219
220	0	for (y = 0; y < h; y++) {
221		// Worst case line is 12 bits per value, + 3 bytes overhead
222	0	if (buf_size * 8 < w * 12 + 24)
223	0	return AVERROR_BUFFER_TOO_SMALL;
224	0	line_begin = q;
225	0	*q++ = 0x12;
226
227	0	x = 0;
228	0	while (x < w) {
229	0	x1 = x;
230	0	color = bitmap[x1++];
231	0	while (x1 < w && bitmap[x1] == color)
232	0	x1++;
233	0	len = x1 - x;
234	0	if (len == 1 && color) {
235		// 00000001 to 11111111 1 pixel in colour x
236	0	*q++ = color;
237	0	} else {
238	0	if (color == 0x00) {
239		// 00000000 0LLLLLLL L pixels (1-127) in colour 0 (L > 0)
240	0	len = FFMIN(len, 127);
241	0	*q++ = 0x00;
242	0	*q++ = len;
243	0	} else if (len > 2) {
244		// 00000000 1LLLLLLL CCCCCCCC L pixels (3-127) in colour C (L > 2)
245	0	len = FFMIN(len, 127);
246	0	*q++ = 0x00;
247	0	*q++ = 0x80+len;
248	0	*q++ = color;
249	0	}
250	0	else if (len == 2) {
251	0	*q++ = color;
252	0	*q++ = color;
253	0	} else {
254	0	*q++ = color;
255	0	len = 1;
256	0	}
257	0	}
258	0	x += len;
259	0	}
260		/* end of line */
261		// 00000000 end of 8-bit/pixel_code_string
262	0	*q++ = 0x00;
263	0	*q++ = 0xf0;
264	0	bitmap += linesize;
265	0	buf_size -= q - line_begin;
266	0	}
267	0	len = q - *pq;
268	0	*pq = q;
269	0	return len;
270	0	}
271
272		static int dvbsub_encode(AVCodecContext avctx, uint8_t outbuf, int buf_size,
273		const AVSubtitle *h)
274	0	{
275	0	DVBSubtitleContext *s = avctx->priv_data;
276	0	uint8_t q, pseg_len;
277	0	int page_id, region_id, clut_id, object_id, i, bpp_index, page_state;
278
279
280	0	q = outbuf;
281
282	0	page_id = 1;
283
284	0	if (h->num_rects && !h->rects)
285	0	return AVERROR(EINVAL);
286
287	0	if (avctx->width > 0 && avctx->height > 0) {
288	0	if (buf_size < 11)
289	0	return AVERROR_BUFFER_TOO_SMALL;
290		/* display definition segment */
291	0	q++ = 0x0f; / sync_byte */
292	0	q++ = 0x14; / segment_type */
293	0	bytestream_put_be16(&q, page_id);
294	0	pseg_len = q;
295	0	q += 2; /* segment length */
296	0	q++ = 0x00; / dds version number & display window flag */
297	0	bytestream_put_be16(&q, avctx->width - 1); /* display width */
298	0	bytestream_put_be16(&q, avctx->height - 1); /* display height */
299	0	bytestream_put_be16(&pseg_len, q - pseg_len - 2);
300	0	buf_size -= 11;
301	0	}
302
303		/* page composition segment */
304
305	0	if (buf_size < 8 + h->num_rects * 6)
306	0	return AVERROR_BUFFER_TOO_SMALL;
307	0	q++ = 0x0f; / sync_byte */
308	0	q++ = 0x10; / segment_type */
309	0	bytestream_put_be16(&q, page_id);
310	0	pseg_len = q;
311	0	q += 2; /* segment length */
312	0	q++ = 30; / page_timeout (seconds) */
313	0	page_state = 2; /* mode change */
314		/* page_version = 0 + page_state */
315	0	*q++ = (s->object_version << 4) \| (page_state << 2) \| 3;
316
317	0	for (region_id = 0; region_id < h->num_rects; region_id++) {
318	0	*q++ = region_id;
319	0	q++ = 0xff; / reserved */
320	0	bytestream_put_be16(&q, h->rects[region_id]->x); /* left pos */
321	0	bytestream_put_be16(&q, h->rects[region_id]->y); /* top pos */
322	0	}
323
324	0	bytestream_put_be16(&pseg_len, q - pseg_len - 2);
325	0	buf_size -= 8 + h->num_rects * 6;
326
327	0	if (h->num_rects) {
328	0	for (clut_id = 0; clut_id < h->num_rects; clut_id++) {
329	0	if (buf_size < 6 + h->rects[clut_id]->nb_colors * 6)
330	0	return AVERROR_BUFFER_TOO_SMALL;
331
332		/* CLUT segment */
333
334	0	if (h->rects[clut_id]->nb_colors <= 4) {
335		/* 2 bpp, some decoders do not support it correctly */
336	0	bpp_index = 0;
337	0	} else if (h->rects[clut_id]->nb_colors <= 16) {
338		/* 4 bpp, standard encoding */
339	0	bpp_index = 1;
340	0	} else if (h->rects[clut_id]->nb_colors <= 256) {
341		/* 8 bpp, standard encoding */
342	0	bpp_index = 2;
343	0	} else {
344	0	return AVERROR(EINVAL);
345	0	}
346
347
348		/* CLUT segment */
349	0	q++ = 0x0f; / sync byte */
350	0	q++ = 0x12; / CLUT definition segment */
351	0	bytestream_put_be16(&q, page_id);
352	0	pseg_len = q;
353	0	q += 2; /* segment length */
354	0	*q++ = clut_id;
355	0	q++ = (0 << 4) \| 0xf; / version = 0 */
356
357	0	for(i = 0; i < h->rects[clut_id]->nb_colors; i++) {
358	0	q++ = i; / clut_entry_id */
359	0	q++ = (1 << (7 - bpp_index)) \| (0xf << 1) \| 1; / 2 bits/pixel full range */
360	0	{
361	0	int a, r, g, b;
362	0	uint32_t x= ((uint32_t*)h->rects[clut_id]->data[1])[i];
363	0	a = (x >> 24) & 0xff;
364	0	r = (x >> 16) & 0xff;
365	0	g = (x >> 8) & 0xff;
366	0	b = (x >> 0) & 0xff;
367
368	0	*q++ = RGB_TO_Y_CCIR(r, g, b);
369	0	*q++ = RGB_TO_V_CCIR(r, g, b, 0);
370	0	*q++ = RGB_TO_U_CCIR(r, g, b, 0);
371	0	*q++ = 255 - a;
372	0	}
373	0	}
374
375	0	bytestream_put_be16(&pseg_len, q - pseg_len - 2);
376	0	buf_size -= 6 + h->rects[clut_id]->nb_colors * 6;
377	0	}
378
379	0	if (buf_size < h->num_rects * 22)
380	0	return AVERROR_BUFFER_TOO_SMALL;
381	0	for (region_id = 0; region_id < h->num_rects; region_id++) {
382
383		/* region composition segment */
384
385	0	if (h->rects[region_id]->nb_colors <= 4) {
386		/* 2 bpp, some decoders do not support it correctly */
387	0	bpp_index = 0;
388	0	} else if (h->rects[region_id]->nb_colors <= 16) {
389		/* 4 bpp, standard encoding */
390	0	bpp_index = 1;
391	0	} else if (h->rects[region_id]->nb_colors <= 256) {
392		/* 8 bpp, standard encoding */
393	0	bpp_index = 2;
394	0	} else {
395	0	return AVERROR(EINVAL);
396	0	}
397
398	0	q++ = 0x0f; / sync_byte */
399	0	q++ = 0x11; / segment_type */
400	0	bytestream_put_be16(&q, page_id);
401	0	pseg_len = q;
402	0	q += 2; /* segment length */
403	0	*q++ = region_id;
404	0	q++ = (s->object_version << 4) \| (0 << 3) \| 0x07; / version , no fill */
405	0	bytestream_put_be16(&q, h->rects[region_id]->w); /* region width */
406	0	bytestream_put_be16(&q, h->rects[region_id]->h); /* region height */
407	0	*q++ = ((1 + bpp_index) << 5) \| ((1 + bpp_index) << 2) \| 0x03;
408	0	q++ = region_id; / clut_id == region_id */
409	0	q++ = 0; / 8 bit fill colors */
410	0	q++ = 0x03; / 4 bit and 2 bit fill colors */
411
412	0	bytestream_put_be16(&q, region_id); /* object_id == region_id */
413	0	*q++ = (0 << 6) \| (0 << 4);
414	0	*q++ = 0;
415	0	*q++ = 0xf0;
416	0	*q++ = 0;
417
418	0	bytestream_put_be16(&pseg_len, q - pseg_len - 2);
419	0	}
420	0	buf_size -= h->num_rects * 22;
421
422	0	for (object_id = 0; object_id < h->num_rects; object_id++) {
423	0	int (dvb_encode_rle)(uint8_t *pq, int buf_size,
424	0	const uint8_t *bitmap, int linesize,
425	0	int w, int h);
426
427	0	if (buf_size < 13)
428	0	return AVERROR_BUFFER_TOO_SMALL;
429
430		/* bpp_index maths */
431	0	if (h->rects[object_id]->nb_colors <= 4) {
432		/* 2 bpp, some decoders do not support it correctly */
433	0	dvb_encode_rle = dvb_encode_rle2;
434	0	} else if (h->rects[object_id]->nb_colors <= 16) {
435		/* 4 bpp, standard encoding */
436	0	dvb_encode_rle = dvb_encode_rle4;
437	0	} else if (h->rects[object_id]->nb_colors <= 256) {
438		/* 8 bpp, standard encoding */
439	0	dvb_encode_rle = dvb_encode_rle8;
440	0	} else {
441	0	return AVERROR(EINVAL);
442	0	}
443
444		/* Object Data segment */
445	0	q++ = 0x0f; / sync byte */
446	0	*q++ = 0x13;
447	0	bytestream_put_be16(&q, page_id);
448	0	pseg_len = q;
449	0	q += 2; /* segment length */
450
451	0	bytestream_put_be16(&q, object_id);
452	0	q++ = (s->object_version << 4) \| (0 << 2) \| (0 << 1) \| 1; / version = 0,
453		object_coding_method,
454		non_modifying_color_flag */
455	0	{
456	0	uint8_t ptop_field_len, pbottom_field_len, top_ptr, bottom_ptr;
457	0	int ret;
458
459	0	ptop_field_len = q;
460	0	q += 2;
461	0	pbottom_field_len = q;
462	0	q += 2;
463	0	buf_size -= 13;
464
465	0	top_ptr = q;
466	0	ret = dvb_encode_rle(&q, buf_size,
467	0	h->rects[object_id]->data[0],
468	0	h->rects[object_id]->w * 2,
469	0	h->rects[object_id]->w,
470	0	h->rects[object_id]->h >> 1);
471	0	if (ret < 0)
472	0	return ret;
473	0	buf_size -= ret;
474	0	bottom_ptr = q;
475	0	ret = dvb_encode_rle(&q, buf_size,
476	0	h->rects[object_id]->data[0] + h->rects[object_id]->w,
477	0	h->rects[object_id]->w * 2,
478	0	h->rects[object_id]->w,
479	0	h->rects[object_id]->h >> 1);
480	0	if (ret < 0)
481	0	return ret;
482	0	buf_size -= ret;
483
484	0	bytestream_put_be16(&ptop_field_len, bottom_ptr - top_ptr);
485	0	bytestream_put_be16(&pbottom_field_len, q - bottom_ptr);
486	0	}
487
488	0	bytestream_put_be16(&pseg_len, q - pseg_len - 2);
489	0	}
490	0	}
491
492		/* end of display set segment */
493
494	0	if (buf_size < 6)
495	0	return AVERROR_BUFFER_TOO_SMALL;
496	0	q++ = 0x0f; / sync_byte */
497	0	q++ = 0x80; / segment_type */
498	0	bytestream_put_be16(&q, page_id);
499	0	pseg_len = q;
500	0	q += 2; /* segment length */
501
502	0	bytestream_put_be16(&pseg_len, q - pseg_len - 2);
503	0	buf_size -= 6;
504
505	0	s->object_version = (s->object_version + 1) & 0xf;
506	0	return q - outbuf;
507	0	}
508
509		const FFCodec ff_dvbsub_encoder = {
510		.p.name = "dvbsub",
511		CODEC_LONG_NAME("DVB subtitles"),
512		.p.type = AVMEDIA_TYPE_SUBTITLE,
513		.p.id = AV_CODEC_ID_DVB_SUBTITLE,
514		.priv_data_size = sizeof(DVBSubtitleContext),
515		FF_CODEC_ENCODE_SUB_CB(dvbsub_encode),
516		};