mirror of
https://github.com/FFmpeg/FFmpeg.git
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248 lines
7.1 KiB
C
248 lines
7.1 KiB
C
/*
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* Binary text decoder
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* eXtended BINary text (XBIN) decoder
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* iCEDraw File decoder
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* Copyright (c) 2010 Peter Ross (pross@xvid.org)
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*
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* This file is part of FFmpeg.
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*
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* 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
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* 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
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* 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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*/
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/**
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* @file
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* Binary text decoder
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* eXtended BINary text (XBIN) decoder
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* iCEDraw File decoder
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*/
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "cga_data.h"
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#include "bintext.h"
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typedef struct XbinContext {
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AVFrame frame;
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int palette[16];
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int flags;
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int font_height;
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const uint8_t *font;
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int x, y;
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} XbinContext;
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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XbinContext *s = avctx->priv_data;
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uint8_t *p;
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int i;
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avctx->pix_fmt = PIX_FMT_PAL8;
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p = avctx->extradata;
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if (p) {
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s->font_height = p[0];
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s->flags = p[1];
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p += 2;
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} else {
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s->font_height = 8;
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s->flags = 0;
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}
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if ((s->flags & BINTEXT_PALETTE)) {
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for (i = 0; i < 16; i++) {
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s->palette[i] = 0xFF000000 | (AV_RB24(p) << 2) | ((AV_RB24(p) >> 4) & 0x30303);
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p += 3;
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}
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} else {
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for (i = 0; i < 16; i++)
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s->palette[i] = 0xFF000000 | ff_cga_palette[i];
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}
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if ((s->flags & BINTEXT_FONT)) {
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s->font = p;
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} else {
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switch(s->font_height) {
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default:
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av_log(avctx, AV_LOG_WARNING, "font height %i not supported\n", s->font_height);
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s->font_height = 8;
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case 8:
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s->font = ff_cga_font;
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break;
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case 16:
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s->font = ff_vga16_font;
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break;
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}
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}
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return 0;
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}
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#define DEFAULT_BG_COLOR 0
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static void hscroll(AVCodecContext *avctx)
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{
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XbinContext *s = avctx->priv_data;
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if (s->y < avctx->height - s->font_height) {
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s->y += s->font_height;
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} else {
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memmove(s->frame.data[0], s->frame.data[0] + s->font_height*s->frame.linesize[0],
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(avctx->height - s->font_height)*s->frame.linesize[0]);
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memset(s->frame.data[0] + (avctx->height - s->font_height)*s->frame.linesize[0],
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DEFAULT_BG_COLOR, s->font_height * s->frame.linesize[0]);
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}
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}
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#define FONT_WIDTH 8
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/**
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* Draw character to screen
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*/
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static void draw_char(AVCodecContext *avctx, int c, int a)
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{
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XbinContext *s = avctx->priv_data;
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if (s->y > avctx->height - s->font_height)
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return;
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ff_draw_pc_font(s->frame.data[0] + s->y * s->frame.linesize[0] + s->x,
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s->frame.linesize[0], s->font, s->font_height, c,
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a & 0x0F, a >> 4);
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s->x += FONT_WIDTH;
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if (s->x > avctx->width - FONT_WIDTH) {
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s->x = 0;
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s->y += s->font_height;
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}
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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XbinContext *s = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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const uint8_t *buf_end = buf+buf_size;
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s->x = s->y = 0;
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s->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
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FF_BUFFER_HINTS_PRESERVE |
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FF_BUFFER_HINTS_REUSABLE;
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if (avctx->reget_buffer(avctx, &s->frame)) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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s->frame.pict_type = AV_PICTURE_TYPE_I;
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s->frame.palette_has_changed = 1;
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memcpy(s->frame.data[1], s->palette, 16 * 4);
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if (avctx->codec_id == CODEC_ID_XBIN) {
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while (buf + 2 < buf_end) {
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int i,c,a;
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int type = *buf >> 6;
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int count = (*buf & 0x3F) + 1;
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buf++;
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switch (type) {
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case 0: //no compression
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for (i = 0; i < count && buf + 1 < buf_end; i++) {
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draw_char(avctx, buf[0], buf[1]);
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buf += 2;
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}
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break;
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case 1: //character compression
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c = *buf++;
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for (i = 0; i < count && buf < buf_end; i++)
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draw_char(avctx, c, *buf++);
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break;
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case 2: //attribute compression
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a = *buf++;
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for (i = 0; i < count && buf < buf_end; i++)
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draw_char(avctx, *buf++, a);
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break;
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case 3: //character/attribute compression
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c = *buf++;
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a = *buf++;
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for (i = 0; i < count && buf < buf_end; i++)
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draw_char(avctx, c, a);
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break;
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}
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}
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} else if (avctx->codec_id == CODEC_ID_IDF) {
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while (buf + 2 < buf_end) {
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if (AV_RL16(buf) == 1) {
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int i;
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if (buf + 6 > buf_end)
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break;
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for (i = 0; i < buf[2]; i++)
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draw_char(avctx, buf[4], buf[5]);
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buf += 6;
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} else {
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draw_char(avctx, buf[0], buf[1]);
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buf += 2;
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}
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}
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} else {
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while (buf + 1 < buf_end) {
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draw_char(avctx, buf[0], buf[1]);
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buf += 2;
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}
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->frame;
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return buf_size;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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XbinContext *s = avctx->priv_data;
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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return 0;
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}
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AVCodec ff_bintext_decoder = {
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.name = "bintext",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_BINTEXT,
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.priv_data_size = sizeof(XbinContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Binary text"),
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};
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AVCodec ff_xbin_decoder = {
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.name = "xbin",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_XBIN,
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.priv_data_size = sizeof(XbinContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text"),
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};
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AVCodec ff_idf_decoder = {
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.name = "idf",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_IDF,
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.priv_data_size = sizeof(XbinContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("iCEDraw text"),
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};
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