#include <lib/base/eerror.h>
#include <lib/dvb/teletext.h>
#include <lib/dvb/idemux.h>
+#include <lib/gdi/gpixmap.h>
+
+/*
+ This is a very simple en300 706 telext decoder.
+
+ It can only decode a single page at a time, thus it's only used
+ for subtitles.
+
+ */
DEFINE_REF(eDVBTeletextParser);
+ /* we asumme error free transmission! */
+static inline unsigned char decode_odd_parity(unsigned char *b)
+{
+ int i;
+ unsigned char res = 0;
+ for (i=0; i<7; ++i)
+ if (*b & (0x80 >> i))
+ res |= 1<<i;
+ return res;
+}
+
+static inline unsigned char decode_hamming_84(unsigned char *b)
+{
+ unsigned char res = 0;
+ res |= (*b << 3) & 8;
+ res |= (*b ) & 4;
+ res |= (*b >> 3) & 2;
+ res |= (*b >> 6) & 1;
+ return res;
+}
+
+static inline unsigned long decode_hamming_2418(unsigned char *b)
+{
+ unsigned long h24 = b[0] | (b[1] << 8) | (b[2] << 16);
+
+ return
+ ((h24 & 0x000004) >> 2) |
+ ((h24 & 0x000070) >> 3) |
+ ((h24 & 0x007f00) >> 4) |
+ ((h24 & 0x7f0000) >> 5);
+}
+
+static int extractPTS(pts_t &pts, unsigned char *pkt)
+{
+ pkt += 7;
+ int flags = *pkt++;
+
+ pkt++; // header length
+
+ if (flags & 0x80) /* PTS present? */
+ {
+ /* damn gcc bug */
+ pts = ((unsigned long long)(((pkt[0] >> 1) & 7))) << 30;
+ pts |= pkt[1] << 22;
+ pts |= (pkt[2]>>1) << 15;
+ pts |= pkt[3] << 7;
+ pts |= (pkt[5]>>1);
+
+ return 0;
+ } else
+ return -1;
+}
+
eDVBTeletextParser::eDVBTeletextParser(iDVBDemux *demux)
{
- setStreamID(0xBD); // as per en 300 472
+ setStreamID(0xBD); /* as per en 300 472 */
+
+ setPage(-1);
if (demux->createPESReader(eApp, m_pes_reader))
eDebug("failed to create PES reader!");
else
m_pes_reader->connectRead(slot(*this, &eDVBTeletextParser::processData), m_read_connection);
-
+}
+
+eDVBTeletextParser::~eDVBTeletextParser()
+{
}
void eDVBTeletextParser::processPESPacket(__u8 *pkt, int len)
{
- eDebug("GOT TELETEXT PACKET:");
- int i;
- for (i=0; i<16; ++i)
- eDebugNoNewLine("%02x ", pkt[i]);
- eDebug("<");
+ unsigned char *p = pkt;
+
+ pts_t pts;
+ int have_pts = extractPTS(pts, pkt);
+
+ p += 4; len -= 4; /* start code, already be verified by pes parser */
+ p += 2; len -= 2; /* length, better use the argument */
+
+ p += 3; len -= 3; /* pes header */
+
+ p += 0x24; len -= 0x24; /* skip header */
+
+// eDebug("data identifier: %02x", *p);
+
+ p++; len--;
+
+ while (len > 2)
+ {
+ unsigned char data_unit_id = *p++;
+ unsigned char data_unit_length = *p++;
+ len -= 2;
+
+ if (len < data_unit_length)
+ {
+ eDebug("data_unit_length > len");
+ break;
+ }
+
+ if (data_unit_length != 44)
+ {
+ /* eDebug("illegal data unit length %d", data_unit_length); */
+ break;
+ }
+
+ unsigned char line_offset = *p++; len--;
+ unsigned char framing_code = *p++; len--;
+
+ int magazine_and_packet_address = decode_hamming_84(p++); len--;
+ magazine_and_packet_address |= decode_hamming_84(p++)<<4; len--;
+
+ unsigned char *data = p; p += 40; len -= 40;
+
+ if (framing_code != 0xe4) /* no teletxt data */
+ continue;
+
+ m_M = magazine_and_packet_address & 7;
+ m_Y = magazine_and_packet_address >> 3;
+
+// eDebug("line %d, framing code: %02x, M=%02x, Y=%02x", line_offset, framing_code, m_M, m_Y);
+
+ if (m_Y == 0) /* page header */
+ {
+ m_C = 0;
+
+ m_S1 = decode_hamming_84(data + 2); /* S1 */
+ int S2C4 = decode_hamming_84(data + 3);
+
+ m_S2 = S2C4 & 7;
+ m_C |= (S2C4 & 8) ? (1<<4) : 0;
+
+ m_S3 = decode_hamming_84(data + 4);
+
+ int S4C5C6 = decode_hamming_84(data + 5);
+
+ m_S4 = S4C5C6 & 3;
+ m_C |= (S4C5C6 & 0xC) << 3;
+
+ m_C |= decode_hamming_84(data + 6) << 7;
+ m_C |= decode_hamming_84(data + 7) << 11;
+
+ int serial_mode = m_C & (1<<11);
+
+ /* page on the same magazine? end current page. */
+ if ((serial_mode || (m_M == m_page_M)) && (m_page_open))
+ {
+ handlePageEnd(have_pts, pts);
+ m_page_open = 0;
+ }
+
+ m_X = decode_hamming_84(data+1) * 0x10 + decode_hamming_84(data);
+
+ if ((m_C & (1<<6)) && (m_X != 0xFF)) /* scan for pages with subtitle bit set */
+ m_found_subtitle_pages.insert((m_M << 8) | m_X);
+
+ /* correct page on correct magazine? open page. */
+ if ((m_M == m_page_M) && (m_X == m_page_X))
+ {
+ handlePageStart();
+ m_page_open = 1;
+ handleLine(data + 8, 32);
+ }
+ } else
+ {
+ /* data for the selected page? */
+ if ((m_M == m_page_M) && m_page_open)
+ handleLine(data, 40);
+ }
+ }
}
int eDVBTeletextParser::start(int pid)
{
+ m_page_open = 0;
+
if (m_pes_reader)
return m_pes_reader->start(pid);
else
return -1;
}
+
+void eDVBTeletextParser::handlePageStart()
+{
+// if (m_C & (1<<4)) /* erase flag set */
+
+ /* we are always erasing the page,
+ even when the erase flag is not set. */
+ m_subtitle_page.clear();
+}
+
+void eDVBTeletextParser::handleLine(unsigned char *data, int len)
+{
+/* // hexdump
+ for (int i=0; i<len; ++i)
+ eDebugNoNewLine("%02x ", decode_odd_parity(data + i));
+ eDebug(""); */
+ if (!m_Y) /* first line is page header, we don't need that. */
+ {
+ m_double_height = -1;
+ return;
+ }
+
+ if (m_double_height == m_Y)
+ {
+ m_double_height = -1;
+ return;
+ }
+
+ int last_was_white = 1, color = 7; /* start with whitespace. start with color=white. (that's unrelated.) */
+
+ std::string text;
+
+// eDebug("handle subtitle line: %d len", len);
+ for (int i=0; i<len; ++i)
+ {
+ unsigned char b = decode_odd_parity(data + i);
+
+ if (b < 0x10) /* spacing attribute */
+ {
+ if (b < 8) /* colors */
+ {
+ if (b != color) /* new color is split into a new string */
+ {
+ addSubtitleString(color, text);
+ text = "";
+ color = b;
+ }
+ } else if (b == 0xd)
+ {
+ m_double_height = m_Y + 1;
+ } else if (b != 0xa && b != 0xb) /* box */
+ eDebug("[ignore %x]", b);
+ /* ignore other attributes */
+ } else
+ {
+ //eDebugNoNewLine("%c", b);
+ /* no more than one whitespace, only printable chars */
+ if (((!last_was_white) || (b != ' ')) && (b >= 0x20))
+ {
+ text += b;
+ last_was_white = b == ' ';
+ }
+ }
+ }
+ //eDebug("");
+ addSubtitleString(color, text);
+}
+
+void eDVBTeletextParser::handlePageEnd(int have_pts, const pts_t &pts)
+{
+// eDebug("handle page end");
+ addSubtitleString(-2, ""); /* end last line */
+
+ m_subtitle_page.m_have_pts = have_pts;
+ m_subtitle_page.m_pts = pts;
+ m_subtitle_page.m_timeout = 90000 * 20; /* 20s */
+ sendSubtitlePage(); /* send assembled subtitle page to display */
+}
+
+void eDVBTeletextParser::setPage(int page)
+{
+ m_page_M = (page >> 8) & 7; /* magazine to look for */
+ m_page_X = page & 0xFF; /* page number */
+}
+
+void eDVBTeletextParser::connectNewPage(const Slot1<void, const eDVBTeletextSubtitlePage&> &slot, ePtr<eConnection> &connection)
+{
+ connection = new eConnection(this, m_new_subtitle_page.connect(slot));
+}
+
+void eDVBTeletextParser::addSubtitleString(int color, std::string string)
+{
+// eDebug("add subtitle string: %s, col %d", string.c_str(), color);
+
+ int force_cell = 0;
+
+ if (string.substr(0, 2) == "- ")
+ {
+ string = string.substr(2);
+ force_cell = 1;
+ }
+
+// eDebug("color %d, m_subtitle_color %d", color, m_subtitle_color);
+ gRGB rgbcol((color & 1) ? 255 : 128, (color & 2) ? 255 : 128, (color & 4) ? 255 : 128);
+ if ((color != m_subtitle_color || force_cell) && !m_subtitle_text.empty() && ((color == -2) || !string.empty()))
+ {
+// eDebug("add text |%s|: %d != %d || %d", m_subtitle_text.c_str(), color, m_subtitle_color, force_cell);
+ m_subtitle_page.m_elements.push_back(eDVBTeletextSubtitlePageElement(rgbcol, m_subtitle_text));
+ m_subtitle_text = "";
+ } else if (!m_subtitle_text.empty() && m_subtitle_text[m_subtitle_text.size()-1] != ' ')
+ m_subtitle_text += " ";
+
+ if (!string.empty())
+ {
+// eDebug("set %d as new color", color);
+ m_subtitle_color = color;
+ m_subtitle_text += string;
+ }
+}
+
+void eDVBTeletextParser::sendSubtitlePage()
+{
+// eDebug("subtitle page:");
+ //for (unsigned int i = 0; i < m_subtitle_page.m_elements.size(); ++i)
+ // eDebug("%s", m_subtitle_page.m_elements[i].m_text.c_str());
+ m_new_subtitle_page(m_subtitle_page);
+}
git.cweiske.de / enigma2.git / blobdiff