// This should be moved to 708.c
// This works for popon, but bad for paint on and roll up
// Please understand this function before you try to use it, setting null values have different effects than you may assume
void sei_encode_eia608 (sei_t* sei, cea708_t* cea708, uint16_t cc_data)
{
// This one is full, flush and init a new one
// shoudl this be 32? I cant remember
if (31 == cea708->user_data.cc_count) {
sei_append_708 (sei,cea708);
}
if (0 == cea708->user_data.cc_count) { // This is a new 708 header, but a continuation of a 608 stream
cea708_add_cc_data (cea708, 1, cc_type_ntsc_cc_field_1, eia608_control_command (eia608_control_resume_caption_loading, DEFAULT_CHANNEL));
}
if (0 == cc_data) { // Finished
sei_encode_eia608 (sei,cea708,eia608_control_command (eia608_control_end_of_caption, DEFAULT_CHANNEL));
sei_append_708 (sei,cea708);
return;
}
cea708_add_cc_data (cea708, 1, cc_type_ntsc_cc_field_1, cc_data);
}
libcaption_stauts_t sei_from_caption_clear(sei_t* sei)
{
cea708_t cea708;
cea708_init(&cea708, sei->timestamp); // set up a new popon frame
cea708_add_cc_data(&cea708, 1, cc_type_ntsc_cc_field_1, eia608_control_command(eia608_control_end_of_caption, DEFAULT_CHANNEL));
cea708_add_cc_data(&cea708, 1, cc_type_ntsc_cc_field_1, eia608_control_command(eia608_control_end_of_caption, DEFAULT_CHANNEL));
cea708_add_cc_data(&cea708, 1, cc_type_ntsc_cc_field_1, eia608_control_command(eia608_control_erase_non_displayed_memory, DEFAULT_CHANNEL));
cea708_add_cc_data(&cea708, 1, cc_type_ntsc_cc_field_1, eia608_control_command(eia608_control_erase_non_displayed_memory, DEFAULT_CHANNEL));
cea708_add_cc_data(&cea708, 1, cc_type_ntsc_cc_field_1, eia608_control_command(eia608_control_erase_display_memory, DEFAULT_CHANNEL));
cea708_add_cc_data(&cea708, 1, cc_type_ntsc_cc_field_1, eia608_control_command(eia608_control_erase_display_memory, DEFAULT_CHANNEL));
sei_append_708(sei, &cea708);
return LIBCAPTION_OK;
}
////////////////////////////////////////////////////////////////////////////////
// TODO move this out of sei
libcaption_stauts_t sei_from_caption_frame(sei_t* sei, caption_frame_t* frame)
{
int r, c;
int unl, prev_unl;
cea708_t cea708;
const char* data;
uint16_t prev_cc_data;
eia608_style_t styl, prev_styl;
sei_init(sei, frame->timestamp);
cea708_init(&cea708, frame->timestamp); // set up a new popon frame
cea708_add_cc_data(&cea708, 1, cc_type_ntsc_cc_field_1, eia608_control_command(eia608_control_erase_non_displayed_memory, DEFAULT_CHANNEL));
cea708_add_cc_data(&cea708, 1, cc_type_ntsc_cc_field_1, eia608_control_command(eia608_control_resume_caption_loading, DEFAULT_CHANNEL));
for (r = 0; r < SCREEN_ROWS; ++r) {
prev_unl = 0, prev_styl = eia608_style_white;
// Calculate preamble
for (c = 0; c < SCREEN_COLS && 0 == *caption_frame_read_char(frame, r, c, &styl, &unl); ++c) {
}
// This row is blank
if (SCREEN_COLS == c) {
continue;
}
// Write preamble
if (0 < c || (0 == unl && eia608_style_white == styl)) {
int tab = c % 4;
sei_encode_eia608(sei, &cea708, eia608_row_column_pramble(r, c, DEFAULT_CHANNEL, 0));
if (tab) {
sei_encode_eia608(sei, &cea708, eia608_tab(tab, DEFAULT_CHANNEL));
}
} else {
sei_encode_eia608(sei, &cea708, eia608_row_style_pramble(r, DEFAULT_CHANNEL, styl, unl));
prev_unl = unl, prev_styl = styl;
}
// Write the row
for (prev_cc_data = 0, data = caption_frame_read_char(frame, r, c, 0, 0);
(*data) && c < SCREEN_COLS; ++c, data = caption_frame_read_char(frame, r, c, &styl, &unl)) {
uint16_t cc_data = eia608_from_utf8_1(data, DEFAULT_CHANNEL);
if (unl != prev_unl || styl != prev_styl) {
sei_encode_eia608(sei, &cea708, eia608_midrow_change(DEFAULT_CHANNEL, styl, unl));
prev_unl = unl, prev_styl = styl;
}
if (!cc_data) {
// We do't want to write bad data, so just ignore it.
} else if (eia608_is_basicna(prev_cc_data)) {
if (eia608_is_basicna(cc_data)) {
// previous and current chars are both basicna, combine them into current
sei_encode_eia608(sei, &cea708, eia608_from_basicna(prev_cc_data, cc_data));
} else if (eia608_is_westeu(cc_data)) {
// extended charcters overwrite the previous charcter, so insert a dummy char thren write the extended char
sei_encode_eia608(sei, &cea708, eia608_from_basicna(prev_cc_data, eia608_from_utf8_1(EIA608_CHAR_SPACE, DEFAULT_CHANNEL)));
sei_encode_eia608(sei, &cea708, cc_data);
} else {
// previous was basic na, but current isnt; write previous and current
sei_encode_eia608(sei, &cea708, prev_cc_data);
sei_encode_eia608(sei, &cea708, cc_data);
}
prev_cc_data = 0; // previous is handled, we can forget it now
} else if (eia608_is_westeu(cc_data)) {
// extended chars overwrite the previous chars, so insert a dummy char
// TODO create a map of alternamt chars for eia608_is_westeu instead of using space
sei_encode_eia608(sei, &cea708, eia608_from_utf8_1(EIA608_CHAR_SPACE, DEFAULT_CHANNEL));
sei_encode_eia608(sei, &cea708, cc_data);
} else if (eia608_is_basicna(cc_data)) {
prev_cc_data = cc_data;
} else {
sei_encode_eia608(sei, &cea708, cc_data);
}
if (eia608_is_specialna(cc_data)) {
// specialna are treated as control charcters. Duplicated control charcters are discarded
// So we write a resume after a specialna as a noop to break repetition detection
// TODO only do this if the same charcter is repeated
sei_encode_eia608(sei, &cea708, eia608_control_command(eia608_control_resume_caption_loading, DEFAULT_CHANNEL));
}
}
if (0 != prev_cc_data) {
sei_encode_eia608(sei, &cea708, prev_cc_data);
}
}
sei_encode_eia608(sei, &cea708, 0); // flush
sei->timestamp = frame->timestamp; // assumes in order frames
// sei_dump (sei);
return LIBCAPTION_OK;
}
