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/*
* extract_dv.c
*
* Copyright (C) Thomas Oestreich - June 2001
*
* 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"
extern void import_exit(int ret);
#define DV_PAL_FRAME_SIZE 144000
#define DV_NTSC_FRAME_SIZE 120000
/* ------------------------------------------------------------
*
* dv extract thread
*
* magic: TC_MAGIC_AVI
* TC_MAGIC_RAW <-- default
*
* ------------------------------------------------------------*/
void extract_dv(info_t *ipipe)
{
avi_t *avifile=NULL;
char *video;
int key, error=0;
long frames, bytes, n;
/* ------------------------------------------------------------
*
* AVI
*
* ------------------------------------------------------------*/
switch(ipipe->magic) {
case TC_MAGIC_AVI:
// scan file
if (ipipe->nav_seek_file) {
if(NULL == (avifile = AVI_open_indexfd(ipipe->fd_in,0,ipipe->nav_seek_file))) {
AVI_print_error("AVI open");
import_exit(1);
}
} else {
if(NULL == (avifile = AVI_open_fd(ipipe->fd_in,1))) {
AVI_print_error("AVI open");
import_exit(1);
}
}
// read video info;
frames = AVI_video_frames(avifile);
if (ipipe->frame_limit[1] < frames)
{
frames=ipipe->frame_limit[1];
}
if(ipipe->verbose & TC_STATS)
tc_log_msg(__FILE__, "%ld video frames", frames);
if((video = tc_zalloc(DV_PAL_FRAME_SIZE))==NULL) {
tc_log_error(__FILE__, "out of memory");
error=1;
break;
}
(int)AVI_set_video_position(avifile,ipipe->frame_limit[0]);
for (n=ipipe->frame_limit[0]; n<=frames; ++n) {
// video
if((bytes = AVI_read_frame(avifile, video, &key))<0) {
error=1;
break;
}
if(tc_pwrite(ipipe->fd_out, video, bytes)!=bytes) {
error=1;
break;
}
}
free(video);
break;
/* ------------------------------------------------------------
*
* RAW
*
* RAW frame skipping code lifted from VLC, which lifted
* (some of it) from libdv.
*
* ------------------------------------------------------------*/
case TC_MAGIC_RAW:
default:
{
unsigned char frame[DV_PAL_FRAME_SIZE];
ssize_t size;
if(ipipe->magic == TC_MAGIC_UNKNOWN)
tc_log_warn(__FILE__, "no file type specified, assuming %s",
filetype(TC_MAGIC_RAW));
/* Skip to the first desired frame. */
for(n=0; n<ipipe->frame_limit[0]; ++n) {
/* The first 32 bits contain the flag for PAL or NTSC frame. */
if(tc_pread(ipipe->fd_in, frame, 4) != 4) {
error = 1;
return;
}
/* Read the rest of the frame. */
size = frame[3] & 128 ? DV_PAL_FRAME_SIZE : DV_NTSC_FRAME_SIZE;
if (tc_pread(ipipe->fd_in, frame, size-4) != size-4) {
error = 1;
return;
}
}
/* Read the right number of frames. */
for(n=ipipe->frame_limit[0]; n<=ipipe->frame_limit[1]; ++n) {
/* The first 32 bits contain the flag for PAL or NTSC frame. */
if(tc_pread(ipipe->fd_in, frame, 4)!=4) {
error = 1;
return;
}
/* Read the rest of the frame. */
size = frame[3] & 128 ? DV_PAL_FRAME_SIZE : DV_NTSC_FRAME_SIZE;
if(tc_pread(ipipe->fd_in, &frame[4], size-4)!=size-4) {
error = 1;
return;
}
/* Write it out. */
if(tc_pwrite(ipipe->fd_out, frame, size)!=size) {
error = 1;
return;
}
}
break;
}
}
}
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