3 * eXtended BINary text (XBIN) decoder
5 * Copyright (c) 2010 Peter Ross (pross@xvid.org)
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 * eXtended BINary text (XBIN) decoder
28 * iCEDraw File decoder
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/xga_font_data.h"
40 typedef struct XbinContext {
49 static av_cold int decode_init(AVCodecContext *avctx)
51 XbinContext *s = avctx->priv_data;
55 avctx->pix_fmt = AV_PIX_FMT_PAL8;
58 s->font_height = p[0];
61 if(avctx->extradata_size < 2 + (!!(s->flags & BINTEXT_PALETTE))*3*16
62 + (!!(s->flags & BINTEXT_FONT))*s->font_height*256) {
63 av_log(avctx, AV_LOG_ERROR, "not enough extradata\n");
64 return AVERROR_INVALIDDATA;
71 if ((s->flags & BINTEXT_PALETTE)) {
72 for (i = 0; i < 16; i++) {
73 s->palette[i] = 0xFF000000 | (AV_RB24(p) << 2) | ((AV_RB24(p) >> 4) & 0x30303);
77 for (i = 0; i < 16; i++)
78 s->palette[i] = 0xFF000000 | ff_cga_palette[i];
81 if ((s->flags & BINTEXT_FONT)) {
84 switch(s->font_height) {
86 av_log(avctx, AV_LOG_WARNING, "font height %i not supported\n", s->font_height);
89 s->font = avpriv_cga_font;
92 s->font = avpriv_vga16_font;
96 if (avctx->width < FONT_WIDTH || avctx->height < s->font_height) {
97 av_log(avctx, AV_LOG_ERROR, "Resolution too small for font.\n");
98 return AVERROR_INVALIDDATA;
104 #define DEFAULT_BG_COLOR 0
105 av_unused static void hscroll(AVCodecContext *avctx)
107 XbinContext *s = avctx->priv_data;
108 if (s->y < avctx->height - s->font_height) {
109 s->y += s->font_height;
111 memmove(s->frame->data[0], s->frame->data[0] + s->font_height*s->frame->linesize[0],
112 (avctx->height - s->font_height)*s->frame->linesize[0]);
113 memset(s->frame->data[0] + (avctx->height - s->font_height)*s->frame->linesize[0],
114 DEFAULT_BG_COLOR, s->font_height * s->frame->linesize[0]);
119 * Draw character to screen
121 static void draw_char(AVCodecContext *avctx, int c, int a)
123 XbinContext *s = avctx->priv_data;
124 if (s->y > avctx->height - s->font_height)
126 ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x,
127 s->frame->linesize[0], s->font, s->font_height, c,
130 if (s->x > avctx->width - FONT_WIDTH) {
132 s->y += s->font_height;
136 static int decode_frame(AVCodecContext *avctx,
137 void *data, int *got_frame,
140 XbinContext *s = avctx->priv_data;
141 const uint8_t *buf = avpkt->data;
142 int buf_size = avpkt->size;
143 const uint8_t *buf_end = buf+buf_size;
146 if ((avctx->width / FONT_WIDTH) * (avctx->height / s->font_height) / 256 > buf_size)
147 return AVERROR_INVALIDDATA;
151 if ((ret = ff_get_buffer(avctx, s->frame, 0)) < 0)
153 s->frame->pict_type = AV_PICTURE_TYPE_I;
154 s->frame->palette_has_changed = 1;
155 memcpy(s->frame->data[1], s->palette, 16 * 4);
157 if (avctx->codec_id == AV_CODEC_ID_XBIN) {
158 while (buf + 2 < buf_end) {
160 int type = *buf >> 6;
161 int count = (*buf & 0x3F) + 1;
164 case 0: //no compression
165 for (i = 0; i < count && buf + 1 < buf_end; i++) {
166 draw_char(avctx, buf[0], buf[1]);
170 case 1: //character compression
172 for (i = 0; i < count && buf < buf_end; i++)
173 draw_char(avctx, c, *buf++);
175 case 2: //attribute compression
177 for (i = 0; i < count && buf < buf_end; i++)
178 draw_char(avctx, *buf++, a);
180 case 3: //character/attribute compression
183 for (i = 0; i < count && buf < buf_end; i++)
184 draw_char(avctx, c, a);
188 } else if (avctx->codec_id == AV_CODEC_ID_IDF) {
189 while (buf + 2 < buf_end) {
190 if (AV_RL16(buf) == 1) {
192 if (buf + 6 > buf_end)
194 for (i = 0; i < buf[2]; i++)
195 draw_char(avctx, buf[4], buf[5]);
198 draw_char(avctx, buf[0], buf[1]);
203 while (buf + 1 < buf_end) {
204 draw_char(avctx, buf[0], buf[1]);
213 #if CONFIG_BINTEXT_DECODER
214 AVCodec ff_bintext_decoder = {
216 .long_name = NULL_IF_CONFIG_SMALL("Binary text"),
217 .type = AVMEDIA_TYPE_VIDEO,
218 .id = AV_CODEC_ID_BINTEXT,
219 .priv_data_size = sizeof(XbinContext),
221 .decode = decode_frame,
222 .capabilities = AV_CODEC_CAP_DR1,
225 #if CONFIG_XBIN_DECODER
226 AVCodec ff_xbin_decoder = {
228 .long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text"),
229 .type = AVMEDIA_TYPE_VIDEO,
230 .id = AV_CODEC_ID_XBIN,
231 .priv_data_size = sizeof(XbinContext),
233 .decode = decode_frame,
234 .capabilities = AV_CODEC_CAP_DR1,
237 #if CONFIG_IDF_DECODER
238 AVCodec ff_idf_decoder = {
240 .long_name = NULL_IF_CONFIG_SMALL("iCEDraw text"),
241 .type = AVMEDIA_TYPE_VIDEO,
242 .id = AV_CODEC_ID_IDF,
243 .priv_data_size = sizeof(XbinContext),
245 .decode = decode_frame,
246 .capabilities = AV_CODEC_CAP_DR1,