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Decoder and demuxer for various binary text formats. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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/* | ||
* 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 | ||
*/ | ||
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/** | ||
* @file libavcodec/xbin.c | ||
* Binary text decoder | ||
* eXtended BINary text (XBIN) decoder | ||
* iCEDraw File decoder | ||
*/ | ||
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#include "libavutil/intreadwrite.h" | ||
#include "avcodec.h" | ||
#include "cga_data.h" | ||
#include "bintext.h" | ||
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typedef struct XbinContext { | ||
AVFrame frame; | ||
int palette[16]; | ||
int flags; | ||
int font_height; | ||
const uint8_t *font; | ||
int x, y; | ||
} XbinContext; | ||
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static av_cold int decode_init(AVCodecContext *avctx) | ||
{ | ||
XbinContext *s = avctx->priv_data; | ||
uint8_t *p; | ||
int i; | ||
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avctx->pix_fmt = PIX_FMT_PAL8; | ||
s->frame.reference = 1; | ||
if (avctx->get_buffer(avctx, &s->frame)) { | ||
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); | ||
return -1; | ||
} | ||
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p = avctx->extradata; | ||
if (p) { | ||
s->font_height = p[0]; | ||
s->flags = p[1]; | ||
p += 2; | ||
} else { | ||
s->font_height = 8; | ||
s->flags = 0; | ||
} | ||
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if ((s->flags & BINTEXT_PALETTE)) { | ||
for (i = 0; i < 16; i++) { | ||
s->palette[i] = 0xFF000000 | (AV_RB24(p) << 2); | ||
p += 3; | ||
} | ||
} else { | ||
for (i = 0; i < 16; i++) | ||
s->palette[i] = 0xFF000000 | ff_cga_palette[i]; | ||
} | ||
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if ((s->flags & BINTEXT_FONT)) { | ||
s->font = p; | ||
} else { | ||
switch(s->font_height) { | ||
default: | ||
av_log(avctx, AV_LOG_WARNING, "font height %i not support\n", s->font_height); | ||
s->font_height = 8; | ||
case 8: | ||
s->font = ff_cga_font; | ||
break; | ||
case 16: | ||
s->font = ff_vga16_font; | ||
break; | ||
} | ||
} | ||
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return 0; | ||
} | ||
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#define DEFAULT_BG_COLOR 0 | ||
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]); | ||
} | ||
} | ||
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#define FONT_WIDTH 8 | ||
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/** | ||
* 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) { | ||
s->x = 0; | ||
s->y += s->font_height; | ||
} | ||
} | ||
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static int decode_frame(AVCodecContext *avctx, | ||
void *data, int *data_size, | ||
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; | ||
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if (avctx->reget_buffer(avctx, &s->frame)) { | ||
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); | ||
return -1; | ||
} | ||
s->frame.pict_type = FF_I_TYPE; | ||
s->frame.palette_has_changed = 1; | ||
memcpy(s->frame.data[1], s->palette, 16 * 4); | ||
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if (avctx->codec_id == 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 == 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; | ||
} | ||
} | ||
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*data_size = sizeof(AVFrame); | ||
*(AVFrame*)data = s->frame; | ||
return buf_size; | ||
} | ||
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static av_cold int decode_end(AVCodecContext *avctx) | ||
{ | ||
XbinContext *s = avctx->priv_data; | ||
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if (s->frame.data[0]) | ||
avctx->release_buffer(avctx, &s->frame); | ||
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return 0; | ||
} | ||
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AVCodec ff_bintext_decoder = { | ||
"xbin", | ||
AVMEDIA_TYPE_VIDEO, | ||
CODEC_ID_BINTEXT, | ||
sizeof(XbinContext), | ||
decode_init, | ||
NULL, | ||
decode_end, | ||
decode_frame, | ||
CODEC_CAP_DR1, | ||
.long_name = NULL_IF_CONFIG_SMALL("Binary text"), | ||
}; | ||
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AVCodec ff_xbin_decoder = { | ||
"xbin", | ||
AVMEDIA_TYPE_VIDEO, | ||
CODEC_ID_XBIN, | ||
sizeof(XbinContext), | ||
decode_init, | ||
NULL, | ||
decode_end, | ||
decode_frame, | ||
CODEC_CAP_DR1, | ||
.long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text"), | ||
}; | ||
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AVCodec ff_idf_decoder = { | ||
"idf", | ||
AVMEDIA_TYPE_VIDEO, | ||
CODEC_ID_IDF, | ||
sizeof(XbinContext), | ||
decode_init, | ||
NULL, | ||
decode_end, | ||
decode_frame, | ||
CODEC_CAP_DR1, | ||
.long_name = NULL_IF_CONFIG_SMALL("iCEDraw text"), | ||
}; |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,37 @@ | ||
/* | ||
* Binary text 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 | ||
*/ | ||
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/** | ||
* @file | ||
* Binary text decoder | ||
*/ | ||
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#ifndef AVCODEC_BINTEXT_H | ||
#define AVCODEC_BINTEXT_H | ||
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/* flag values passed between avformat and avcodec; | ||
* while these are identical to the XBIN flags, they are are also used | ||
* for the BINTEXT and IDF decoders. | ||
*/ | ||
#define BINTEXT_PALETTE 0x1 | ||
#define BINTEXT_FONT 0x2 | ||
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#endif /* AVCODEC_BINTEXT_H */ |
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