252 lines
7.6 KiB
C
Executable file
252 lines
7.6 KiB
C
Executable file
/*
|
|
* Binary text decoder
|
|
* eXtended BINary text (XBIN) decoder
|
|
* iCEDraw File decoder
|
|
* Copyright (c) 2010 Peter Ross (pross@xvid.org)
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Binary text decoder
|
|
* eXtended BINary text (XBIN) decoder
|
|
* iCEDraw File decoder
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/xga_font_data.h"
|
|
#include "avcodec.h"
|
|
#include "cga_data.h"
|
|
#include "bintext.h"
|
|
#include "internal.h"
|
|
|
|
#define FONT_WIDTH 8
|
|
|
|
typedef struct XbinContext {
|
|
AVFrame *frame;
|
|
int palette[16];
|
|
int flags;
|
|
int font_height;
|
|
const uint8_t *font;
|
|
int x, y;
|
|
} XbinContext;
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
XbinContext *s = avctx->priv_data;
|
|
uint8_t *p;
|
|
int i;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_PAL8;
|
|
p = avctx->extradata;
|
|
if (p) {
|
|
s->font_height = p[0];
|
|
s->flags = p[1];
|
|
p += 2;
|
|
if(avctx->extradata_size < 2 + (!!(s->flags & BINTEXT_PALETTE))*3*16
|
|
+ (!!(s->flags & BINTEXT_FONT))*s->font_height*256) {
|
|
av_log(avctx, AV_LOG_ERROR, "not enough extradata\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (!s->font_height) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid font height\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
} else {
|
|
s->font_height = 8;
|
|
s->flags = 0;
|
|
}
|
|
|
|
if ((s->flags & BINTEXT_PALETTE)) {
|
|
for (i = 0; i < 16; i++) {
|
|
s->palette[i] = 0xFF000000 | (AV_RB24(p) << 2) | ((AV_RB24(p) >> 4) & 0x30303);
|
|
p += 3;
|
|
}
|
|
} else {
|
|
for (i = 0; i < 16; i++)
|
|
s->palette[i] = 0xFF000000 | ff_cga_palette[i];
|
|
}
|
|
|
|
if ((s->flags & BINTEXT_FONT)) {
|
|
s->font = p;
|
|
} else {
|
|
switch(s->font_height) {
|
|
default:
|
|
av_log(avctx, AV_LOG_WARNING, "font height %i not supported\n", s->font_height);
|
|
s->font_height = 8;
|
|
case 8:
|
|
s->font = avpriv_cga_font;
|
|
break;
|
|
case 16:
|
|
s->font = avpriv_vga16_font;
|
|
break;
|
|
}
|
|
}
|
|
if (avctx->width < FONT_WIDTH || avctx->height < s->font_height) {
|
|
av_log(avctx, AV_LOG_ERROR, "Resolution too small for font.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define DEFAULT_BG_COLOR 0
|
|
av_unused static void hscroll(AVCodecContext *avctx)
|
|
{
|
|
XbinContext *s = avctx->priv_data;
|
|
if (s->y < avctx->height - s->font_height) {
|
|
s->y += s->font_height;
|
|
} else {
|
|
memmove(s->frame->data[0], s->frame->data[0] + s->font_height*s->frame->linesize[0],
|
|
(avctx->height - s->font_height)*s->frame->linesize[0]);
|
|
memset(s->frame->data[0] + (avctx->height - s->font_height)*s->frame->linesize[0],
|
|
DEFAULT_BG_COLOR, s->font_height * s->frame->linesize[0]);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Draw character to screen
|
|
*/
|
|
static void draw_char(AVCodecContext *avctx, int c, int a)
|
|
{
|
|
XbinContext *s = avctx->priv_data;
|
|
if (s->y > avctx->height - s->font_height)
|
|
return;
|
|
ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x,
|
|
s->frame->linesize[0], s->font, s->font_height, c,
|
|
a & 0x0F, a >> 4);
|
|
s->x += FONT_WIDTH;
|
|
if (s->x > avctx->width - FONT_WIDTH) {
|
|
s->x = 0;
|
|
s->y += s->font_height;
|
|
}
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx,
|
|
void *data, int *got_frame,
|
|
AVPacket *avpkt)
|
|
{
|
|
XbinContext *s = avctx->priv_data;
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
const uint8_t *buf_end = buf+buf_size;
|
|
int ret;
|
|
|
|
if ((avctx->width / FONT_WIDTH) * (avctx->height / s->font_height) / 256 > buf_size)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
s->frame = data;
|
|
s->x = s->y = 0;
|
|
if ((ret = ff_get_buffer(avctx, s->frame, 0)) < 0)
|
|
return ret;
|
|
s->frame->pict_type = AV_PICTURE_TYPE_I;
|
|
s->frame->palette_has_changed = 1;
|
|
memcpy(s->frame->data[1], s->palette, 16 * 4);
|
|
|
|
if (avctx->codec_id == AV_CODEC_ID_XBIN) {
|
|
while (buf + 2 < buf_end) {
|
|
int i,c,a;
|
|
int type = *buf >> 6;
|
|
int count = (*buf & 0x3F) + 1;
|
|
buf++;
|
|
switch (type) {
|
|
case 0: //no compression
|
|
for (i = 0; i < count && buf + 1 < buf_end; i++) {
|
|
draw_char(avctx, buf[0], buf[1]);
|
|
buf += 2;
|
|
}
|
|
break;
|
|
case 1: //character compression
|
|
c = *buf++;
|
|
for (i = 0; i < count && buf < buf_end; i++)
|
|
draw_char(avctx, c, *buf++);
|
|
break;
|
|
case 2: //attribute compression
|
|
a = *buf++;
|
|
for (i = 0; i < count && buf < buf_end; i++)
|
|
draw_char(avctx, *buf++, a);
|
|
break;
|
|
case 3: //character/attribute compression
|
|
c = *buf++;
|
|
a = *buf++;
|
|
for (i = 0; i < count && buf < buf_end; i++)
|
|
draw_char(avctx, c, a);
|
|
break;
|
|
}
|
|
}
|
|
} else if (avctx->codec_id == AV_CODEC_ID_IDF) {
|
|
while (buf + 2 < buf_end) {
|
|
if (AV_RL16(buf) == 1) {
|
|
int i;
|
|
if (buf + 6 > buf_end)
|
|
break;
|
|
for (i = 0; i < buf[2]; i++)
|
|
draw_char(avctx, buf[4], buf[5]);
|
|
buf += 6;
|
|
} else {
|
|
draw_char(avctx, buf[0], buf[1]);
|
|
buf += 2;
|
|
}
|
|
}
|
|
} else {
|
|
while (buf + 1 < buf_end) {
|
|
draw_char(avctx, buf[0], buf[1]);
|
|
buf += 2;
|
|
}
|
|
}
|
|
|
|
*got_frame = 1;
|
|
return buf_size;
|
|
}
|
|
|
|
#if CONFIG_BINTEXT_DECODER
|
|
AVCodec ff_bintext_decoder = {
|
|
.name = "bintext",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Binary text"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_BINTEXT,
|
|
.priv_data_size = sizeof(XbinContext),
|
|
.init = decode_init,
|
|
.decode = decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|
|
#endif
|
|
#if CONFIG_XBIN_DECODER
|
|
AVCodec ff_xbin_decoder = {
|
|
.name = "xbin",
|
|
.long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_XBIN,
|
|
.priv_data_size = sizeof(XbinContext),
|
|
.init = decode_init,
|
|
.decode = decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|
|
#endif
|
|
#if CONFIG_IDF_DECODER
|
|
AVCodec ff_idf_decoder = {
|
|
.name = "idf",
|
|
.long_name = NULL_IF_CONFIG_SMALL("iCEDraw text"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_IDF,
|
|
.priv_data_size = sizeof(XbinContext),
|
|
.init = decode_init,
|
|
.decode = decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|
|
#endif
|