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/*****************************************************************************
* vbi.c : Video4Linux2 VBI input module for vlc
*****************************************************************************
* Copyright (C) 2012 the VideoLAN team
*
* Author: Devin Heitmueller <dheitmueller at kernellabs dot com>
*
* This program 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.
*
* This program 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 program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <errno.h>
#include <sys/types.h>
#include <fcntl.h>
#include <vlc_common.h>
#include <vlc_block.h>
#include <vlc_fs.h>
#include <vlc_demux.h>
#include "v4l2.h"
#ifdef ZVBI_COMPILED
# include <libzvbi.h>
# define VBI_NUM_CC_STREAMS 4
struct vlc_v4l2_vbi
{
vbi_capture *cap;
es_out_id_t *es[VBI_NUM_CC_STREAMS];
};
vlc_v4l2_vbi_t *OpenVBI (demux_t *demux, const char *psz_device)
{
vlc_v4l2_vbi_t *vbi = malloc (sizeof (*vbi));
if (unlikely(vbi == NULL))
return NULL;
int rawfd = vlc_open (psz_device, O_RDWR);
if (rawfd == -1)
{
msg_Err (demux, "cannot open device '%s': %s", psz_device,
vlc_strerror_c(errno));
goto err;
}
//Can put more in here. See osd.c in zvbi package.
unsigned int services = VBI_SLICED_CAPTION_525;
char *errstr = NULL;
vbi->cap = vbi_capture_v4l2k_new (psz_device, rawfd,
/* buffers */ 5,
&services,
/* strict */ 1,
&errstr,
/* verbose */ 1);
if (vbi->cap == NULL)
{
msg_Err (demux, "cannot capture VBI data: %s", errstr);
free (errstr);
close (rawfd);
goto err;
}
for (unsigned i = 0; i < VBI_NUM_CC_STREAMS; i++)
{
es_format_t fmt;
es_format_Init (&fmt, SPU_ES, VLC_FOURCC('c', 'c', '1' + i, ' '));
if (asprintf (&fmt.psz_description, "Closed captions %d", i + 1) >= 0)
{
msg_Dbg (demux, "new spu es %4.4s", (char *)&fmt.i_codec);
vbi->es[i] = es_out_Add (demux->out, &fmt);
}
}
/* Do a single read and throw away the results so that ZVBI calls
the STREAMON ioctl() */
GrabVBI(demux, vbi);
return vbi;
err:
free (vbi);
return NULL;
}
int GetFdVBI (vlc_v4l2_vbi_t *vbi)
{
return vbi_capture_fd(vbi->cap);
}
void GrabVBI (demux_t *p_demux, vlc_v4l2_vbi_t *vbi)
{
vbi_capture_buffer *sliced_bytes;
struct timeval timeout={0,0}; /* poll */
int canc = vlc_savecancel ();
int r = vbi_capture_pull_sliced (vbi->cap, &sliced_bytes, &timeout);
switch (r) {
case -1:
msg_Err (p_demux, "error reading VBI: %s", vlc_strerror_c(errno));
case 0: /* nothing avail */
break;
case 1: /* got data */
{
int n_lines = sliced_bytes->size / sizeof(vbi_sliced);
if (!n_lines)
break;
int sliced_size = 2; /* Number of bytes per sliced line */
int size = (sliced_size + 1) * n_lines;
block_t *p_block = block_Alloc (size);
if (unlikely(p_block == NULL))
break;
uint8_t* data = p_block->p_buffer;
vbi_sliced *sliced_array = sliced_bytes->data;
for (int field = 0; field < n_lines; field++)
{
*data = field;
data++;
memcpy(data, sliced_array[field].data, sliced_size);
data += sliced_size;
}
p_block->i_pts = mdate();
for (unsigned i = 0; i < VBI_NUM_CC_STREAMS; i++)
{
if (vbi->es[i] == NULL)
continue;
block_t *dup = block_Duplicate(p_block);
if (likely(dup != NULL))
es_out_Send(p_demux->out, vbi->es[i], dup);
}
block_Release(p_block);
}
}
vlc_restorecancel (canc);
}
void CloseVBI (vlc_v4l2_vbi_t *vbi)
{
close (vbi_capture_fd (vbi->cap));
vbi_capture_delete (vbi->cap);
free (vbi);
}
#endif
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