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: %m");
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);
}
static GstFlowReturn
gst_vbisrc_create(GstPushSrc *psrc, GstBuffer **buf)
{
Gstvbisrc *vbisrc = GST_VBISRC_CAST(psrc);
GstFlowReturn ret;
GstMapInfo info;
fd_set rd;
int res;
struct timeval timeout;
int vbi_fd=vbi_capture_fd(vbisrc->pVbiCapt);
vbi_capture_buffer *pVbiBuf;
vbi_sliced *pVbiData;
GstBuffer *outbuf;
uint lineCount;
uint line;
FD_ZERO(&rd);
FD_SET(vbi_fd,&rd);
select(vbi_fd +1 ,&rd , NULL, NULL, NULL);
if (FD_ISSET(vbi_fd,&rd))
{
timeout.tv_sec = 0;
timeout.tv_usec = 1000;
res = vbi_capture_pull_sliced(vbisrc->pVbiCapt,&pVbiBuf,&timeout);
if (res>0 && pVbiBuf !=NULL)
{
lineCount = ((unsigned int)pVbiBuf->size)/sizeof(vbi_sliced);
pVbiData = pVbiBuf->data;
GST_LOG_OBJECT(vbisrc,"Having %d lines in buffer",lineCount);
for (line=0; line<lineCount; line++ ) {
if((pVbiData[line].id & (VBI_SLICED_TELETEXT_B))!=0) {
GST_LOG_OBJECT(vbisrc,"SLICED_TELETEXT found in line %d",pVbiData[line].line);
}
}
ret=GST_BASE_SRC_CLASS(parent_class) -> alloc (GST_BASE_SRC_CAST(vbisrc),
-1,pVbiBuf->size,&outbuf);
gst_buffer_map(outbuf,&info,GST_MAP_WRITE);
memcpy(info.data,(guint8*)pVbiBuf->data,pVbiBuf->size);
gst_buffer_unmap(outbuf,&info);
*buf=GST_BUFFER_CAST(outbuf);
GST_LOG_OBJECT (vbisrc,"Buffer pushed with size: %d", pVbiBuf->size);
return ret;
}
}
return GST_FLOW_ERROR;
}
