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"
36 typedef struct XbinContext {
45 static av_cold int decode_init(AVCodecContext *avctx)
47 XbinContext *s = avctx->priv_data;
51 avctx->pix_fmt = PIX_FMT_PAL8;
54 s->font_height = p[0];
57 if(avctx->extradata_size < 2 + (!!(s->flags & BINTEXT_PALETTE))*3*16
58 + (!!(s->flags & BINTEXT_FONT))*s->font_height*256) {
59 av_log(avctx, AV_LOG_ERROR, "not enough extradata\n");
60 return AVERROR_INVALIDDATA;
67 if ((s->flags & BINTEXT_PALETTE)) {
68 for (i = 0; i < 16; i++) {
69 s->palette[i] = 0xFF000000 | (AV_RB24(p) << 2) | ((AV_RB24(p) >> 4) & 0x30303);
73 for (i = 0; i < 16; i++)
74 s->palette[i] = 0xFF000000 | ff_cga_palette[i];
77 if ((s->flags & BINTEXT_FONT)) {
80 switch(s->font_height) {
82 av_log(avctx, AV_LOG_WARNING, "font height %i not supported\n", s->font_height);
85 s->font = ff_cga_font;
88 s->font = ff_vga16_font;
96 #define DEFAULT_BG_COLOR 0
97 av_unused static void hscroll(AVCodecContext *avctx)
99 XbinContext *s = avctx->priv_data;
100 if (s->y < avctx->height - s->font_height) {
101 s->y += s->font_height;
103 memmove(s->frame.data[0], s->frame.data[0] + s->font_height*s->frame.linesize[0],
104 (avctx->height - s->font_height)*s->frame.linesize[0]);
105 memset(s->frame.data[0] + (avctx->height - s->font_height)*s->frame.linesize[0],
106 DEFAULT_BG_COLOR, s->font_height * s->frame.linesize[0]);
113 * Draw character to screen
115 static void draw_char(AVCodecContext *avctx, int c, int a)
117 XbinContext *s = avctx->priv_data;
118 if (s->y > avctx->height - s->font_height)
120 ff_draw_pc_font(s->frame.data[0] + s->y * s->frame.linesize[0] + s->x,
121 s->frame.linesize[0], s->font, s->font_height, c,
124 if (s->x > avctx->width - FONT_WIDTH) {
126 s->y += s->font_height;
130 static int decode_frame(AVCodecContext *avctx,
131 void *data, int *data_size,
134 XbinContext *s = avctx->priv_data;
135 const uint8_t *buf = avpkt->data;
136 int buf_size = avpkt->size;
137 const uint8_t *buf_end = buf+buf_size;
140 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
141 FF_BUFFER_HINTS_PRESERVE |
142 FF_BUFFER_HINTS_REUSABLE;
143 if (avctx->reget_buffer(avctx, &s->frame)) {
144 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
147 s->frame.pict_type = AV_PICTURE_TYPE_I;
148 s->frame.palette_has_changed = 1;
149 memcpy(s->frame.data[1], s->palette, 16 * 4);
151 if (avctx->codec_id == AV_CODEC_ID_XBIN) {
152 while (buf + 2 < buf_end) {
154 int type = *buf >> 6;
155 int count = (*buf & 0x3F) + 1;
158 case 0: //no compression
159 for (i = 0; i < count && buf + 1 < buf_end; i++) {
160 draw_char(avctx, buf[0], buf[1]);
164 case 1: //character compression
166 for (i = 0; i < count && buf < buf_end; i++)
167 draw_char(avctx, c, *buf++);
169 case 2: //attribute compression
171 for (i = 0; i < count && buf < buf_end; i++)
172 draw_char(avctx, *buf++, a);
174 case 3: //character/attribute compression
177 for (i = 0; i < count && buf < buf_end; i++)
178 draw_char(avctx, c, a);
182 } else if (avctx->codec_id == AV_CODEC_ID_IDF) {
183 while (buf + 2 < buf_end) {
184 if (AV_RL16(buf) == 1) {
186 if (buf + 6 > buf_end)
188 for (i = 0; i < buf[2]; i++)
189 draw_char(avctx, buf[4], buf[5]);
192 draw_char(avctx, buf[0], buf[1]);
197 while (buf + 1 < buf_end) {
198 draw_char(avctx, buf[0], buf[1]);
203 *data_size = sizeof(AVFrame);
204 *(AVFrame*)data = s->frame;
208 static av_cold int decode_end(AVCodecContext *avctx)
210 XbinContext *s = avctx->priv_data;
212 if (s->frame.data[0])
213 avctx->release_buffer(avctx, &s->frame);
218 #if CONFIG_BINTEXT_DECODER
219 AVCodec ff_bintext_decoder = {
221 .type = AVMEDIA_TYPE_VIDEO,
222 .id = AV_CODEC_ID_BINTEXT,
223 .priv_data_size = sizeof(XbinContext),
226 .decode = decode_frame,
227 .capabilities = CODEC_CAP_DR1,
228 .long_name = NULL_IF_CONFIG_SMALL("Binary text"),
231 #if CONFIG_XBIN_DECODER
232 AVCodec ff_xbin_decoder = {
234 .type = AVMEDIA_TYPE_VIDEO,
235 .id = AV_CODEC_ID_XBIN,
236 .priv_data_size = sizeof(XbinContext),
239 .decode = decode_frame,
240 .capabilities = CODEC_CAP_DR1,
241 .long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text"),
244 #if CONFIG_IDF_DECODER
245 AVCodec ff_idf_decoder = {
247 .type = AVMEDIA_TYPE_VIDEO,
248 .id = AV_CODEC_ID_IDF,
249 .priv_data_size = sizeof(XbinContext),
252 .decode = decode_frame,
253 .capabilities = CODEC_CAP_DR1,
254 .long_name = NULL_IF_CONFIG_SMALL("iCEDraw text"),