WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavcodec/dvbsub.c

Rev	Author	Line No.	Line
6148	serge	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 "libavutil/colorspace.h"
		24
		25	typedef struct DVBSubtitleContext {
		26	int object_version;
		27	} DVBSubtitleContext;
		28
		29	#define PUTBITS2(val)\
		30	{\
		31	bitbuf \|= (val) << bitcnt;\
		32	bitcnt -= 2;\
		33	if (bitcnt < 0) {\
		34	bitcnt = 6;\
		35	*q++ = bitbuf;\
		36	bitbuf = 0;\
		37	}\
		38	}
		39
		40	static void dvb_encode_rle2(uint8_t **pq,
		41	const uint8_t *bitmap, int linesize,
		42	int w, int h)
		43	{
		44	uint8_t *q;
		45	unsigned int bitbuf;
		46	int bitcnt;
		47	int x, y, len, x1, v, color;
		48
		49	q = *pq;
		50
		51	for(y = 0; y < h; y++) {
		52	*q++ = 0x10;
		53	bitbuf = 0;
		54	bitcnt = 6;
		55
		56	x = 0;
		57	while (x < w) {
		58	x1 = x;
		59	color = bitmap[x1++];
		60	while (x1 < w && bitmap[x1] == color)
		61	x1++;
		62	len = x1 - x;
		63	if (color == 0 && len == 2) {
		64	PUTBITS2(0);
		65	PUTBITS2(0);
		66	PUTBITS2(1);
		67	} else if (len >= 3 && len <= 10) {
		68	v = len - 3;
		69	PUTBITS2(0);
		70	PUTBITS2((v >> 2) \| 2);
		71	PUTBITS2(v & 3);
		72	PUTBITS2(color);
		73	} else if (len >= 12 && len <= 27) {
		74	v = len - 12;
		75	PUTBITS2(0);
		76	PUTBITS2(0);
		77	PUTBITS2(2);
		78	PUTBITS2(v >> 2);
		79	PUTBITS2(v & 3);
		80	PUTBITS2(color);
		81	} else if (len >= 29) {
		82	/* length = 29 ... 284 */
		83	if (len > 284)
		84	len = 284;
		85	v = len - 29;
		86	PUTBITS2(0);
		87	PUTBITS2(0);
		88	PUTBITS2(3);
		89	PUTBITS2((v >> 6));
		90	PUTBITS2((v >> 4) & 3);
		91	PUTBITS2((v >> 2) & 3);
		92	PUTBITS2(v & 3);
		93	PUTBITS2(color);
		94	} else {
		95	PUTBITS2(color);
		96	if (color == 0) {
		97	PUTBITS2(1);
		98	}
		99	len = 1;
		100	}
		101	x += len;
		102	}
		103	/* end of line */
		104	PUTBITS2(0);
		105	PUTBITS2(0);
		106	PUTBITS2(0);
		107	if (bitcnt != 6) {
		108	*q++ = bitbuf;
		109	}
		110	*q++ = 0xf0;
		111	bitmap += linesize;
		112	}
		113	*pq = q;
		114	}
		115
		116	#define PUTBITS4(val)\
		117	{\
		118	bitbuf \|= (val) << bitcnt;\
		119	bitcnt -= 4;\
		120	if (bitcnt < 0) {\
		121	bitcnt = 4;\
		122	*q++ = bitbuf;\
		123	bitbuf = 0;\
		124	}\
		125	}
		126
		127	/* some DVB decoders only implement 4 bits/pixel */
		128	static void dvb_encode_rle4(uint8_t **pq,
		129	const uint8_t *bitmap, int linesize,
		130	int w, int h)
		131	{
		132	uint8_t *q;
		133	unsigned int bitbuf;
		134	int bitcnt;
		135	int x, y, len, x1, v, color;
		136
		137	q = *pq;
		138
		139	for(y = 0; y < h; y++) {
		140	*q++ = 0x11;
		141	bitbuf = 0;
		142	bitcnt = 4;
		143
		144	x = 0;
		145	while (x < w) {
		146	x1 = x;
		147	color = bitmap[x1++];
		148	while (x1 < w && bitmap[x1] == color)
		149	x1++;
		150	len = x1 - x;
		151	if (color == 0 && len == 2) {
		152	PUTBITS4(0);
		153	PUTBITS4(0xd);
		154	} else if (color == 0 && (len >= 3 && len <= 9)) {
		155	PUTBITS4(0);
		156	PUTBITS4(len - 2);
		157	} else if (len >= 4 && len <= 7) {
		158	PUTBITS4(0);
		159	PUTBITS4(8 + len - 4);
		160	PUTBITS4(color);
		161	} else if (len >= 9 && len <= 24) {
		162	PUTBITS4(0);
		163	PUTBITS4(0xe);
		164	PUTBITS4(len - 9);
		165	PUTBITS4(color);
		166	} else if (len >= 25) {
		167	if (len > 280)
		168	len = 280;
		169	v = len - 25;
		170	PUTBITS4(0);
		171	PUTBITS4(0xf);
		172	PUTBITS4(v >> 4);
		173	PUTBITS4(v & 0xf);
		174	PUTBITS4(color);
		175	} else {
		176	PUTBITS4(color);
		177	if (color == 0) {
		178	PUTBITS4(0xc);
		179	}
		180	len = 1;
		181	}
		182	x += len;
		183	}
		184	/* end of line */
		185	PUTBITS4(0);
		186	PUTBITS4(0);
		187	if (bitcnt != 4) {
		188	*q++ = bitbuf;
		189	}
		190	*q++ = 0xf0;
		191	bitmap += linesize;
		192	}
		193	*pq = q;
		194	}
		195
		196	static void dvb_encode_rle8(uint8_t **pq,
		197	const uint8_t *bitmap, int linesize,
		198	int w, int h)
		199	{
		200	uint8_t *q;
		201	int x, y, len, x1, color;
		202
		203	q = *pq;
		204
		205	for (y = 0; y < h; y++) {
		206	*q++ = 0x12;
		207
		208	x = 0;
		209	while (x < w) {
		210	x1 = x;
		211	color = bitmap[x1++];
		212	while (x1 < w && bitmap[x1] == color)
		213	x1++;
		214	len = x1 - x;
		215	if (len == 1 && color) {
		216	// 00000001 to 11111111 1 pixel in colour x
		217	*q++ = color;
		218	} else {
		219	if (color == 0x00) {
		220	// 00000000 0LLLLLLL L pixels (1-127) in colour 0 (L > 0)
		221	len = FFMIN(len, 127);
		222	*q++ = 0x00;
		223	*q++ = len;
		224	} else if (len > 2) {
		225	// 00000000 1LLLLLLL CCCCCCCC L pixels (3-127) in colour C (L > 2)
		226	len = FFMIN(len, 127);
		227	*q++ = 0x00;
		228	*q++ = 0x80+len;
		229	*q++ = color;
		230	}
		231	else if (len == 2) {
		232	*q++ = color;
		233	*q++ = color;
		234	} else {
		235	*q++ = color;
		236	len = 1;
		237	}
		238	}
		239	x += len;
		240	}
		241	/* end of line */
		242	// 00000000 00000000 end of 8-bit/pixel_code_string
		243	*q++ = 0x00;
		244	*q++ = 0x00;
		245	bitmap += linesize;
		246	}
		247	*pq = q;
		248	}
		249
		250	static int encode_dvb_subtitles(DVBSubtitleContext *s,
		251	uint8_t outbuf, const AVSubtitle h)
		252	{
		253	uint8_t q, pseg_len;
		254	int page_id, region_id, clut_id, object_id, i, bpp_index, page_state;
		255
		256
		257	q = outbuf;
		258
		259	page_id = 1;
		260
		261	if (h->num_rects && h->rects == NULL)
		262	return -1;
		263
		264	q++ = 0x00; / subtitle_stream_id */
		265
		266	/* page composition segment */
		267
		268	q++ = 0x0f; / sync_byte */
		269	q++ = 0x10; / segment_type */
		270	bytestream_put_be16(&q, page_id);
		271	pseg_len = q;
		272	q += 2; /* segment length */
		273	q++ = 30; / page_timeout (seconds) */
		274	page_state = 2; /* mode change */
		275	/* page_version = 0 + page_state */
		276	*q++ = (s->object_version << 4) \| (page_state << 2) \| 3;
		277
		278	for (region_id = 0; region_id < h->num_rects; region_id++) {
		279	*q++ = region_id;
		280	q++ = 0xff; / reserved */
		281	bytestream_put_be16(&q, h->rects[region_id]->x); /* left pos */
		282	bytestream_put_be16(&q, h->rects[region_id]->y); /* top pos */
		283	}
		284
		285	bytestream_put_be16(&pseg_len, q - pseg_len - 2);
		286
		287	if (h->num_rects) {
		288	for (clut_id = 0; clut_id < h->num_rects; clut_id++) {
		289
		290	/* CLUT segment */
		291
		292	if (h->rects[clut_id]->nb_colors <= 4) {
		293	/* 2 bpp, some decoders do not support it correctly */
		294	bpp_index = 0;
		295	} else if (h->rects[clut_id]->nb_colors <= 16) {
		296	/* 4 bpp, standard encoding */
		297	bpp_index = 1;
		298	} else if (h->rects[clut_id]->nb_colors <= 256) {
		299	/* 8 bpp, standard encoding */
		300	bpp_index = 2;
		301	} else {
		302	return -1;
		303	}
		304
		305
		306	/* CLUT segment */
		307	q++ = 0x0f; / sync byte */
		308	q++ = 0x12; / CLUT definition segment */
		309	bytestream_put_be16(&q, page_id);
		310	pseg_len = q;
		311	q += 2; /* segment length */
		312	*q++ = clut_id;
		313	q++ = (0 << 4) \| 0xf; / version = 0 */
		314
		315	for(i = 0; i < h->rects[clut_id]->nb_colors; i++) {
		316	q++ = i; / clut_entry_id */
		317	q++ = (1 << (7 - bpp_index)) \| (0xf << 1) \| 1; / 2 bits/pixel full range */
		318	{
		319	int a, r, g, b;
		320	uint32_t x= ((uint32_t*)h->rects[clut_id]->pict.data[1])[i];
		321	a = (x >> 24) & 0xff;
		322	r = (x >> 16) & 0xff;
		323	g = (x >> 8) & 0xff;
		324	b = (x >> 0) & 0xff;
		325
		326	*q++ = RGB_TO_Y_CCIR(r, g, b);
		327	*q++ = RGB_TO_V_CCIR(r, g, b, 0);
		328	*q++ = RGB_TO_U_CCIR(r, g, b, 0);
		329	*q++ = 255 - a;
		330	}
		331	}
		332
		333	bytestream_put_be16(&pseg_len, q - pseg_len - 2);
		334	}
		335	}
		336
		337	for (region_id = 0; region_id < h->num_rects; region_id++) {
		338
		339	/* region composition segment */
		340
		341	if (h->rects[region_id]->nb_colors <= 4) {
		342	/* 2 bpp, some decoders do not support it correctly */
		343	bpp_index = 0;
		344	} else if (h->rects[region_id]->nb_colors <= 16) {
		345	/* 4 bpp, standard encoding */
		346	bpp_index = 1;
		347	} else {
		348	return -1;
		349	}
		350
		351	q++ = 0x0f; / sync_byte */
		352	q++ = 0x11; / segment_type */
		353	bytestream_put_be16(&q, page_id);
		354	pseg_len = q;
		355	q += 2; /* segment length */
		356	*q++ = region_id;
		357	q++ = (s->object_version << 4) \| (0 << 3) \| 0x07; / version , no fill */
		358	bytestream_put_be16(&q, h->rects[region_id]->w); /* region width */
		359	bytestream_put_be16(&q, h->rects[region_id]->h); /* region height */
		360	*q++ = ((1 + bpp_index) << 5) \| ((1 + bpp_index) << 2) \| 0x03;
		361	q++ = region_id; / clut_id == region_id */
		362	q++ = 0; / 8 bit fill colors */
		363	q++ = 0x03; / 4 bit and 2 bit fill colors */
		364
		365	bytestream_put_be16(&q, region_id); /* object_id == region_id */
		366	*q++ = (0 << 6) \| (0 << 4);
		367	*q++ = 0;
		368	*q++ = 0xf0;
		369	*q++ = 0;
		370
		371	bytestream_put_be16(&pseg_len, q - pseg_len - 2);
		372	}
		373
		374	if (h->num_rects) {
		375
		376	for (object_id = 0; object_id < h->num_rects; object_id++) {
		377	void (dvb_encode_rle)(uint8_t *pq,
		378	const uint8_t *bitmap, int linesize,
		379	int w, int h);
		380
		381	/* bpp_index maths */
		382	if (h->rects[object_id]->nb_colors <= 4) {
		383	/* 2 bpp, some decoders do not support it correctly */
		384	dvb_encode_rle = dvb_encode_rle2;
		385	} else if (h->rects[object_id]->nb_colors <= 16) {
		386	/* 4 bpp, standard encoding */
		387	dvb_encode_rle = dvb_encode_rle4;
		388	} else if (h->rects[object_id]->nb_colors <= 256) {
		389	/* 8 bpp, standard encoding */
		390	dvb_encode_rle = dvb_encode_rle8;
		391	} else {
		392	return -1;
		393	}
		394
		395	/* Object Data segment */
		396	q++ = 0x0f; / sync byte */
		397	*q++ = 0x13;
		398	bytestream_put_be16(&q, page_id);
		399	pseg_len = q;
		400	q += 2; /* segment length */
		401
		402	bytestream_put_be16(&q, object_id);
		403	q++ = (s->object_version << 4) \| (0 << 2) \| (0 << 1) \| 1; / version = 0,
		404	onject_coding_method,
		405	non_modifying_color_flag */
		406	{
		407	uint8_t ptop_field_len, pbottom_field_len, top_ptr, bottom_ptr;
		408
		409	ptop_field_len = q;
		410	q += 2;
		411	pbottom_field_len = q;
		412	q += 2;
		413
		414	top_ptr = q;
		415	dvb_encode_rle(&q, h->rects[object_id]->pict.data[0], h->rects[object_id]->w * 2,
		416	h->rects[object_id]->w, h->rects[object_id]->h >> 1);
		417	bottom_ptr = q;
		418	dvb_encode_rle(&q, h->rects[object_id]->pict.data[0] + h->rects[object_id]->w,
		419	h->rects[object_id]->w * 2, h->rects[object_id]->w,
		420	h->rects[object_id]->h >> 1);
		421
		422	bytestream_put_be16(&ptop_field_len, bottom_ptr - top_ptr);
		423	bytestream_put_be16(&pbottom_field_len, q - bottom_ptr);
		424	}
		425
		426	bytestream_put_be16(&pseg_len, q - pseg_len - 2);
		427	}
		428	}
		429
		430	/* end of display set segment */
		431
		432	q++ = 0x0f; / sync_byte */
		433	q++ = 0x80; / segment_type */
		434	bytestream_put_be16(&q, page_id);
		435	pseg_len = q;
		436	q += 2; /* segment length */
		437
		438	bytestream_put_be16(&pseg_len, q - pseg_len - 2);
		439
		440	q++ = 0xff; / end of PES data */
		441
		442	s->object_version = (s->object_version + 1) & 0xf;
		443	return q - outbuf;
		444	}
		445
		446	static int dvbsub_encode(AVCodecContext *avctx,
		447	unsigned char *buf, int buf_size,
		448	const AVSubtitle *sub)
		449	{
		450	DVBSubtitleContext *s = avctx->priv_data;
		451	int ret;
		452
		453	ret = encode_dvb_subtitles(s, buf, sub);
		454	return ret;
		455	}
		456
		457	AVCodec ff_dvbsub_encoder = {
		458	.name = "dvbsub",
		459	.long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
		460	.type = AVMEDIA_TYPE_SUBTITLE,
		461	.id = AV_CODEC_ID_DVB_SUBTITLE,
		462	.priv_data_size = sizeof(DVBSubtitleContext),
		463	.encode_sub = dvbsub_encode,
		464	};

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(root)/contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavcodec/dvbsub.c – Rev 6148