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/*
* MPEG mode for QEmacs.
* Copyright (c) 2001 Fabrice Bellard.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "qe.h"
#define SEQ_END_CODE 0x000001b7
#define SEQ_START_CODE 0x000001b3
#define GOP_START_CODE 0x000001b8
#define PICTURE_START_CODE 0x00000100
#define SLICE_MIN_START_CODE 0x00000101
#define SLICE_MAX_START_CODE 0x000001af
#define EXT_START_CODE 0x000001b5
#define USER_START_CODE 0x000001b2
#define PACK_START_CODE 0x000001ba
#define SYSTEM_HEADER_START_CODE 0x000001bb
#define ISO_11172_END_CODE 0x000001b9
static int mpeg_display(EditState *s, DisplayState *ds, int offset)
{
unsigned int startcode;
int ret, badchars, offset_start;
unsigned char buf[4];
/* search start code */
badchars = 0;
display_bol(ds);
display_printf(ds, -1, -1, "%08x:", offset);
for(;;) {
ret = eb_read(s->b, offset, buf, 4);
if (ret == 0) {
if (badchars)
display_eol(ds, -1, -1);
goto the_end;
}
if (ret == 4) {
startcode = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
if ((startcode & 0xffffff00) == 0x00000100) {
if (badchars) {
display_eol(ds, -1, -1);
display_bol(ds);
display_printf(ds, -1, -1, "%08x:", offset);
}
break;
}
}
/* display unknown chars */
display_printf(ds, -1, -1, " [");
display_printhex(ds, offset, offset + 1, buf[0], 2);
display_printf(ds, -1, -1, "]");
offset++;
if (++badchars == 8) {
badchars = 0;
display_eol(ds, -1, -1);
goto the_end;
}
}
offset_start = offset;
offset += 4;
display_printf(ds, offset_start, offset, " [%08x] ", startcode);
switch(startcode) {
case SEQ_END_CODE:
display_printf(ds, -1, -1, "SEQ_END");
break;
case SEQ_START_CODE:
display_printf(ds, -1, -1, "SEQUENCE");
break;
case PICTURE_START_CODE:
display_printf(ds, -1, -1, "PICTURE");
break;
case GOP_START_CODE:
display_printf(ds, -1, -1, "GOP");
break;
case EXT_START_CODE:
display_printf(ds, -1, -1, "EXT");
break;
case PACK_START_CODE:
display_printf(ds, -1, -1, "PACK");
break;
case SYSTEM_HEADER_START_CODE:
display_printf(ds, -1, -1, "SYSTEM");
break;
default:
if (startcode >= SLICE_MIN_START_CODE &&
startcode <= SLICE_MAX_START_CODE) {
display_printf(ds, -1, -1, "SLICE %d", startcode & 0xff);
} else {
display_printf(ds, -1, -1, "UNKNOWN", startcode);
}
break;
}
display_eol(ds, -1, -1);
the_end:
return offset;
}
/* go to previous synchronization point */
static int mpeg_backward_offset(EditState *s, int offset)
{
unsigned char buf[4];
unsigned int startcode;
int ret;
for(;;) {
if (offset <= 0)
break;
ret = eb_read(s->b, offset, buf, 4);
if (ret != 4)
break;
startcode = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
if ((startcode & 0xffffff00) == 0x00000100) {
break;
}
offset--;
}
return offset;
}
static int mpeg_mode_init(EditState *s, ModeSavedData *saved_data)
{
int ret;
ret = text_mode_init(s, saved_data);
if (ret)
return ret;
s->hex_mode = 1;
s->hex_nibble = 0;
s->wrap = WRAP_TRUNCATE;
return 0;
}
static int mpeg_mode_probe(ModeProbeData *p)
{
if (p->buf_size >= 4 &&
p->buf[0] == 0x00 &&
p->buf[1] == 0x00 &&
p->buf[2] == 0x01 &&
p->buf[3] >= 0xa0)
return 100;
else
return 0;
}
static ModeDef mpeg_mode = {
"mpeg",
mode_probe: mpeg_mode_probe,
mode_init: mpeg_mode_init,
mode_close: NULL,
text_display: mpeg_display,
text_backward_offset: mpeg_backward_offset,
write_char: hex_write_char,
};
static int mpeg_init(void)
{
qe_register_mode(&mpeg_mode);
return 0;
}
qe_module_init(mpeg_init);
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