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/*
* readfile.c --
*
* Procedures concerned with reading data and parsing
* start codes from MPEG files.
*
*/
/*
* Copyright (c) 1995 The Regents of the University of California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
/*
* Portions of this software Copyright (c) 1995 Brown University.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement
* is hereby granted, provided that the above copyright notice and the
* following two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL BROWN UNIVERSITY BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF BROWN
* UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* BROWN UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
* BASIS, AND BROWN UNIVERSITY HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#include <sys/types.h>
#ifdef __STDC__
#include <stdlib.h>
#include <string.h>
#endif
#include <string.h>
#include <signal.h>
#include "SDL_endian.h"
#include "video.h"
#include "proto.h"
#include "util.h"
#include "dither.h"
/*
Changes to make the code reentrant:
deglobalized: totNumFrames, realTimeStart, stream id vars, Prase_done,
swap, seekValue, input, EOF_flag, ReadPacket statics, sys_layer,
bitOffset, bitLength, bitBuffer, curVidStream
removed: [aud,sys,vid]Bytes
Additional changes:
get rid on ANSI C complaints about shifting
-lsh@cs.brown.edu (Loring Holden)
*/
/*
*--------------------------------------------------------------
*
* get_more_data --
*
* Called by get_more_data to read in more data from
* video MPG files (non-system-layer)
*
* Results:
* Input buffer updated, buffer length updated.
* Returns 1 if data read, 0 if EOF, -1 if error.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
get_more_data( VidStream* vid_stream )
{
unsigned int *buf_start;
int length, num_read, i;
unsigned int request;
unsigned char *buffer, *mark;
unsigned int *lmark;
if (vid_stream->EOF_flag) return 0;
buf_start = vid_stream->buf_start;
length = vid_stream->buf_length;
buffer = (unsigned char *) vid_stream->buffer;
if (length > 0) {
memcpy((unsigned char *) buf_start, buffer, (unsigned int) (length*4));
mark = ((unsigned char *) (buf_start + length));
}
else {
mark = (unsigned char *) buf_start;
length = 0;
}
request = (vid_stream->max_buf_length-length)*4;
num_read = vid_stream->_smpeg->mpeg->copy_data(mark, request);
/* Paulo Villegas - 26/1/1993: Correction for 4-byte alignment */
{
int num_read_rounded;
unsigned char *index;
num_read_rounded = 4*(num_read/4);
/* this can happen only if num_read<request; i.e. end of file reached */
if ( num_read_rounded < num_read ) {
num_read_rounded = 4*( num_read/4+1 );
/* fill in with zeros */
for( index=mark+num_read; index<mark+num_read_rounded; *(index++)=0 );
/* advance to the next 4-byte boundary */
num_read = num_read_rounded;
}
}
if (num_read < 0) {
return -1;
}
if (num_read == 0) {
vid_stream->buffer = buf_start;
/* Make 32 bits after end equal to 0 and 32
* bits after that equal to seq end code
* in order to prevent messy data from infinite
* recursion.
*/
*(buf_start + length) = 0x0;
*(buf_start + length+1) = SEQ_END_CODE;
vid_stream->EOF_flag = 1;
return 0;
}
lmark = (unsigned int *) mark;
num_read = num_read/4;
for (i = 0; i < num_read; i++) {
*lmark = SDL_SwapBE32(*lmark);
lmark++;
}
vid_stream->buffer = buf_start;
vid_stream->buf_length = length + num_read;
return 1;
}
/* EOF */
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