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#include "ttxtsubsdisplayer.h"
#include "ttxtsubsdisplay.h"
#include "utils.h"
#include "ttxtsubs.h"
#include "siinfo.h"
#include "ttxtsubsglobals.h"
// ----- class cTtxtSubsDisplayer -----
cTtxtSubsDisplayer::cTtxtSubsDisplayer(int textpage)
:
mDisp(NULL),
mGetMutex(),
mGetCond(),
mRingBuf(18800, true),
mRun(0)
{
mDisp = new cTtxtSubsDisplay();
mDisp->SetPage(textpage);
mRun = 1;
this->Start(); // start thread
}
cTtxtSubsDisplayer::~cTtxtSubsDisplayer(void)
{
// stop thread
mRun = false;
mGetCond.Broadcast();
this->Cancel(5);
if(mDisp) {
delete mDisp;
mDisp = NULL;
}
}
// handled messages in ring buffer - runs in a thread of its own
void cTtxtSubsDisplayer::Action(void)
{
while(mRun) {
cFrame *f;
f = mRingBuf.Get();
if(f) {
mDisp->TtxtData(f->Data());
mRingBuf.Drop(f);
} else {
// wait for more data
mGetMutex.Lock();
mGetCond.TimedWait(mGetMutex, 500);
mDisp->TtxtData(NULL); // give display some idle time
mGetMutex.Unlock();
}
}
}
void cTtxtSubsDisplayer::ShowDisplay(void)
{
mDisp->Show();
}
void cTtxtSubsDisplayer::HideDisplay(void)
{
mDisp->Hide();
}
// ----- class cTtxtSubsLiveReceiver -----
cTtxtSubsLiveReceiver::cTtxtSubsLiveReceiver(int Pid, int textpage)
:
cReceiver(0, -1, 1, Pid),
cTtxtSubsDisplayer(textpage)
{
}
void cTtxtSubsLiveReceiver::Activate(bool On)
{
//dprint("cTtxtSubsLiveReceiver::Activate: On:%d\n", On);
}
// Take TS packets and break out the teletext data
// Buffer the data for processing in a separate thread
// XXX We should do some filtering here to avoid unneccessary load!
void cTtxtSubsLiveReceiver::Receive(uchar *Data, int Length)
{
int i;
if(Length != 188) // should never happen
return;
if(Data[1] & 0x80) // transport_error_indicator
return;
// payload_unit_start_indicator
for(i = (Data[1] & 0x40) ? 1 : 0; i < 4; i++) {
if(0xff == Data[4 + i*46]) // stuffing data
continue;
cFrame *f = new cFrame(Data + 4 + i*46, 46);
mRingBuf.Put(f);
mGetCond.Broadcast();
}
}
// ----- class cTtxtSubsPlayer -----
cTtxtSubsPlayer::cTtxtSubsPlayer(int backup_textpage)
:
cTtxtSubsDisplayer(backup_textpage),
mHasFilteredStream(0),
mFoundLangPage(0),
mLangChoise(1000),
mLangInfoState(0)
{
}
// Take PES packets and break out the teletext data
// Buffer the data for processing in a separate thread
// XXX We should do some filtering here to avoid unneccessary load!
void cTtxtSubsPlayer::PES_data(uchar *p, int Length)
{
int i;
//printf("cTtxtSubsPlayer: len: %d\n", Length); // XXX
if(Length < 46 || p[0] != 0 || p[1] != 0 || p[2] != 1 || p[3] != 0xbd || p[8] != 0x24 ||
p[45] < 0x10 || p[45] >= 0x20) {
fprintf(stderr, "cTtxtSubsPlayer::PES_data: bad indata!\n");
}
// Recorded teletext typically has payload type 0x10.
// We use the payload type 0x1f to indicate that we have our own
// filtered stream, if we find that we only use that.
if(p[45] == 0x1f && !mHasFilteredStream)
mHasFilteredStream = 1;
if(mHasFilteredStream && p[45] != 0x1f)
return; // other teletext data, ignore
if(mHasFilteredStream && !mFoundLangPage)
SearchLanguagePage(p, Length);
// payload_unit_start_indicator
for(i = 1; (i*46) < Length ; i++) {
if(0xff == p[i*46]) // stuffing data
continue;
cFrame *f = new cFrame(p + i*46, 46);
mRingBuf.Put(f);
mGetCond.Broadcast();
}
}
static void copy_inv_strip_par(uint8_t *dest, uint8_t *src, size_t len)
{
size_t i;
for(i = 0; i < len; i++)
dest[i] = invtab[src[i]] & 0x7f;
}
void cTtxtSubsPlayer::SearchLanguagePage(uint8_t *p, int len)
{
char *infoline = "Subtitles Index Page";
int foundlines = 0;
if(len < (3*46))
return;
struct ttxt_data_field *d;
for(d = ((struct ttxt_data_field *) p) + 1; ((uint8_t *) d) < (p + len + 45); d++) {
int mp = UNHAM_INV(d->mag_addr_ham[0], d->mag_addr_ham[1]);
//int mag = mp & 0x7;
int packet = (mp >> 3) & 0x1f;
uint8_t buf[40];
if(d->data_unit_id != 0x02)
break; // a subtitle line
switch(foundlines) {
case 0:
if(packet != 0) // need a Y0 first
return;
foundlines++;
break;
case 1:
if(packet != 1) // need a Y1
return;
copy_inv_strip_par(buf, d->data, sizeof(buf));
if(memcmp((char *) buf, infoline, strlen(infoline)))
return;
foundlines++;
break;
case 2:
mLangInfoState++;
if(packet < 2) // need a Y2 or more
return;
if(mLangInfoState == 3)
fprintf(stderr, "ttxtsubs: Chosen Language not found in recording, available languages:\n");
copy_inv_strip_par(buf, d->data, sizeof(buf));
for(size_t i = 0; i < 40; i += 8) {
if(mLangInfoState == 3 && buf[i] >= 'a' && buf[i] <= 'z')
fprintf(stderr, " %c%c%c: %c%c%c %s\n", buf[i+4], buf[i+5], buf[i+6],
buf[i], buf[i+1], buf[i+2], buf[i+3] == ' ' ? "" :
buf[i+3] == 'h' ? "(Hearing Impaired)" : "(Unknown type)");
if(buf[i] >= 'a' && buf[i] <= 'z' &&
buf[i+1] >= 'a' && buf[i+1] <= 'z' &&
buf[i+2] >= 'a' && buf[i+2] <= 'z' &&
((buf[i+3] == ' ') || (buf[i+3] == 'h')) &&
buf[i+4] >= '1' && buf[i+4] <= '8' &&
buf[i+5] >= '0' && buf[i+5] <= '9' &&
buf[i+6] >= '0' && buf[i+6] <= '9' &&
buf[i+7] == ' ') {
int ch = globals.langChoise((char *)buf+i, buf[i+3] == 'h');
unsigned int page =
((buf[i+4] - '0') << 8) +
((buf[i+5] - '0') << 4) +
(buf[i+6] - '0');
if(page >= 0x100 && page < 0x900) {
if(page >= 0x800)
page -= 0x800;
if(ch >= 0 && ch < mLangChoise) {
mLangChoise = ch;
mDisp->SetPage(page);
mFoundLangPage = 1;
fprintf(stderr, "Found subtitle page: %03x\n", page); // XXX
}
}
}
}
break;
}
}
}
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