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/*
* decode_lzo.c
*
* Copyright (C) Tilmann Bitterberg - 2003
*
* This file is part of transcode, a video stream processing tool
*
* transcode is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* transcode 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "transcode.h"
#include "libtc/libtc.h"
#include "tcinfo.h"
#include "ioaux.h"
#include "avilib/avilib.h"
#include "tc.h"
#ifdef HAVE_LZO
#include "libtc/tc_lzo.h"
#define MOD_NAME "decode_lzo"
#define BUFFER_SIZE SIZE_RGB_FRAME<<1
static int r;
static lzo_byte *out;
static lzo_byte *inbuf;
static lzo_byte *wrkmem;
static lzo_uint out_len;
inline static void str2long(unsigned char *bb, long *bytes)
{
*bytes = (bb[0]<<24) | (bb[1]<<16) | (bb[2]<<8) | (bb[3]);
}
void decode_lzo(decode_t *decode)
{
long bytes;
ssize_t ss;
tc_lzo_header_t h;
/*
* Step 1: initialize the LZO library
*/
if (lzo_init() != LZO_E_OK) {
tc_log_error(__FILE__, "lzo_init() failed");
goto decoder_error;
}
wrkmem = (lzo_bytep) lzo_malloc(LZO1X_1_MEM_COMPRESS);
out = (lzo_bytep) lzo_malloc(BUFFER_SIZE);
inbuf = (lzo_bytep) lzo_malloc(BUFFER_SIZE);
if (wrkmem == NULL || out == NULL) {
tc_log_error(__FILE__, "out of memory");
goto decoder_error;
}
r = 0;
out_len = 0;
verbose = decode->verbose;
for (;;) {
if ( (ss=tc_pread (decode->fd_in, (uint8_t *)&h, sizeof(h))) != sizeof(h)) {
//tc_log_msg(__FILE__, "failed to read frame size: EOF. expected (%ld) got (%d)", 4L, ss);
goto decoder_out;
}
// check magic
if (h.magic != TC_CODEC_LZO2) {
tc_log_error(__FILE__, "Wrong stream magic: expected (0x%x) got (0x%x)", TC_CODEC_LZO2, h.magic);
goto decoder_error;
}
//str2long(bb, &bytes);
bytes = h.size;
if (verbose & TC_DEBUG)
tc_log_msg(__FILE__, "got bytes (%ld)", bytes);
if ( (ss=tc_pread (decode->fd_in, inbuf, bytes))!=bytes) {
tc_log_error(__FILE__, "failed to read frame: expected (%ld) got (%lu)", bytes, (unsigned long)ss);
goto decoder_error;
}
if (h.flags & TC_LZO_NOT_COMPRESSIBLE) {
ac_memcpy(out, inbuf, bytes);
out_len = bytes;
r = LZO_E_OK;
} else {
r = lzo1x_decompress(inbuf, bytes, out, &out_len, wrkmem);
}
if (r == LZO_E_OK) {
if(verbose & TC_DEBUG)
tc_log_msg(__FILE__, "decompressed %lu bytes into %lu bytes",
(long) bytes, (long) out_len);
} else {
/* this should NEVER happen */
tc_log_error(__FILE__, "internal error - decompression failed: %d", r);
goto decoder_error;
}
if ( (ss = tc_pwrite (decode->fd_out, out, out_len)) != out_len) {
tc_log_error(__FILE__, "failed to write frame: expected (%ld) wrote (%lu)", bytes, (unsigned long)ss);
goto decoder_error;
}
}
decoder_out:
import_exit(0);
decoder_error:
import_exit(1);
}
#else /* HAVE_LZO */
void decode_lzo(decode_t *decode)
{
tc_log_error(__FILE__, "No support for LZO configured -- exiting");
import_exit(1);
}
#endif /* HAVE_LZO */
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