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dvbsubtitle.c
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dvbsubtitle.c
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/*
* dvbsubtitle.c: DVB subtitles
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* Original author: Marco Schluessler <marco@lordzodiac.de>
* With some input from the "subtitles plugin" by Pekka Virtanen <pekka.virtanen@sci.fi>
*
* $Id: dvbsubtitle.c 5.2 2022/12/06 16:57:01 kls Exp $
*/
#include "dvbsubtitle.h"
#define __STDC_FORMAT_MACROS // Required for format specifiers
#include <inttypes.h>
#include "device.h"
#include "libsi/si.h"
#define PAGE_COMPOSITION_SEGMENT 0x10
#define REGION_COMPOSITION_SEGMENT 0x11
#define CLUT_DEFINITION_SEGMENT 0x12
#define OBJECT_DATA_SEGMENT 0x13
#define DISPLAY_DEFINITION_SEGMENT 0x14
#define DISPARITY_SIGNALING_SEGMENT 0x15 // DVB BlueBook A156
#define END_OF_DISPLAY_SET_SEGMENT 0x80
#define STUFFING_SEGMENT 0xFF
#define PGS_PALETTE_SEGMENT 0x14
#define PGS_OBJECT_SEGMENT 0x15
#define PGS_PRESENTATION_SEGMENT 0x16
#define PGS_WINDOW_SEGMENT 0x17
#define PGS_DISPLAY_SEGMENT 0x80
// Set these to 'true' for debug output, which is written into the file dbg-log.htm
// in the current working directory. The HTML file shows the actual bitmaps (dbg-nnn.jpg)
// used to display the subtitles.
static bool DebugNormal = false; // shows pages, regions and objects
static bool DebugVerbose = false; // shows everything
static bool DebugDisplay = DebugVerbose || DebugNormal;
static bool DebugPages = DebugVerbose || DebugNormal;
static bool DebugRegions = DebugVerbose || DebugNormal;
static bool DebugObjects = DebugVerbose || DebugNormal;
static bool DebugConverter = DebugVerbose;
static bool DebugSegments = DebugVerbose;
static bool DebugPixel = DebugVerbose;
static bool DebugCluts = DebugVerbose;
static bool DebugOutput = DebugVerbose;
#define dbgdisplay(a...) if (DebugDisplay) SD.WriteHtml(a)
#define dbgpages(a...) if (DebugPages) SD.WriteHtml(a)
#define dbgregions(a...) if (DebugRegions) SD.WriteHtml(a)
#define dbgobjects(a...) if (DebugObjects) SD.WriteHtml(a)
#define dbgconverter(a...) if (DebugConverter) SD.WriteHtml(a)
#define dbgsegments(a...) if (DebugSegments) SD.WriteHtml(a)
#define dbgpixel(a...) if (DebugPixel) SD.WriteHtml(a)
#define dbgcluts(a...) if (DebugCluts) SD.WriteHtml(a)
#define dbgoutput(a...) if (DebugOutput) SD.WriteHtml(a)
#define DBGMAXBITMAPS 100 // debug output will be stopped after this many bitmaps
#define DBGBITMAPWIDTH 400
#define FIX_SUBTITLE_VERSION_BROADCASTER_STUPIDITY // some don't properly handle version numbers, which renders them useless because subtitles are not displayed
// --- cSubtitleDebug --------------------------------------------------------
class cSubtitleDebug {
private:
cMutex mutex;
int imgCnt;
int64_t firstPts;
bool newFile;
double factor;
public:
cSubtitleDebug(void) { Reset(); }
void Reset(void);
bool Active(void) { return imgCnt < DBGMAXBITMAPS; }
int64_t FirstPts(void) { return firstPts; }
void SetFirstPts(int64_t FirstPts) { if (firstPts < 0) firstPts = FirstPts; }
void SetFactor(double Factor) { factor = Factor; }
cString WriteJpeg(const cBitmap *Bitmap, int MaxX = 0, int MaxY = 0);
void WriteHtml(const char *Format, ...);
};
void cSubtitleDebug::Reset(void)
{
imgCnt = 0;
firstPts = -1;
newFile = true;
factor = 1.0;
}
cString cSubtitleDebug::WriteJpeg(const cBitmap *Bitmap, int MaxX, int MaxY)
{
if (!Active())
return NULL;
cMutexLock MutexLock(&mutex);
cBitmap *Scaled = Bitmap->Scaled(factor, factor, true);
int w = MaxX ? int(round(MaxX * factor)) : Scaled->Width();
int h = MaxY ? int(round(MaxY * factor)) : Scaled->Height();
uchar mem[w * h * 3];
for (int x = 0; x < w; x++) {
for (int y = 0; y < h; y++) {
tColor c = Scaled->GetColor(x, y);
int o = (y * w + x) * 3;
mem[o++] = (c & 0x00FF0000) >> 16;
mem[o++] = (c & 0x0000FF00) >> 8;
mem[o] = (c & 0x000000FF);
}
}
delete Scaled;
int Size = 0;
uchar *Jpeg = RgbToJpeg(mem, w, h, Size);
cString ImgName = cString::sprintf("dbg-%03d.jpg", imgCnt++);
int f = open(ImgName, O_WRONLY | O_CREAT, DEFFILEMODE);
if (f >= 0) {
if (write(f, Jpeg, Size) < 0)
LOG_ERROR_STR(*ImgName);
close(f);
}
free(Jpeg);
return ImgName;
}
void cSubtitleDebug::WriteHtml(const char *Format, ...)
{
if (!Active())
return;
cMutexLock MutexLock(&mutex);
if (FILE *f = fopen("dbg-log.htm", newFile ? "w" : "a")) {
va_list ap;
va_start(ap, Format);
vfprintf(f, Format, ap);
va_end(ap);
fclose(f);
newFile = false;
}
}
static cSubtitleDebug SD;
// --- cSubtitleClut ---------------------------------------------------------
class cSubtitleClut : public cListObject {
private:
int clutId;
int clutVersionNumber;
cPalette palette2;
cPalette palette4;
cPalette palette8;
tColor yuv2rgb(int Y, int Cb, int Cr);
void SetColor(int Bpp, int Index, tColor Color);
public:
cSubtitleClut(int ClutId);
void Parse(cBitStream &bs);
void ParsePgs(cBitStream &bs);
int ClutId(void) { return clutId; }
int ClutVersionNumber(void) { return clutVersionNumber; }
const cPalette *GetPalette(int Bpp);
};
cSubtitleClut::cSubtitleClut(int ClutId)
:palette2(2)
,palette4(4)
,palette8(8)
{
int a = 0, r = 0, g = 0, b = 0;
clutId = ClutId;
clutVersionNumber = -1;
// ETSI EN 300 743 10.3: 4-entry CLUT default contents
palette2.SetColor(0, ArgbToColor( 0, 0, 0, 0));
palette2.SetColor(1, ArgbToColor(255, 255, 255, 255));
palette2.SetColor(2, ArgbToColor(255, 0, 0, 0));
palette2.SetColor(3, ArgbToColor(255, 127, 127, 127));
// ETSI EN 300 743 10.2: 16-entry CLUT default contents
palette4.SetColor(0, ArgbToColor(0, 0, 0, 0));
for (int i = 1; i < 16; ++i) {
if (i < 8) {
r = (i & 1) ? 255 : 0;
g = (i & 2) ? 255 : 0;
b = (i & 4) ? 255 : 0;
}
else {
r = (i & 1) ? 127 : 0;
g = (i & 2) ? 127 : 0;
b = (i & 4) ? 127 : 0;
}
palette4.SetColor(i, ArgbToColor(255, r, g, b));
}
// ETSI EN 300 743 10.1: 256-entry CLUT default contents
palette8.SetColor(0, ArgbToColor(0, 0, 0, 0));
for (int i = 1; i < 256; ++i) {
if (i < 8) {
r = (i & 1) ? 255 : 0;
g = (i & 2) ? 255 : 0;
b = (i & 4) ? 255 : 0;
a = 63;
}
else {
switch (i & 0x88) {
case 0x00:
r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
a = 255;
break;
case 0x08:
r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
a = 127;
break;
case 0x80:
r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
a = 255;
break;
case 0x88:
r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
a = 255;
break;
}
}
palette8.SetColor(i, ArgbToColor(a, r, g, b));
}
}
void cSubtitleClut::Parse(cBitStream &bs)
{
int Version = bs.GetBits(4);
#ifndef FIX_SUBTITLE_VERSION_BROADCASTER_STUPIDITY
if (clutVersionNumber == Version)
return; // no update
#endif
clutVersionNumber = Version;
bs.SkipBits(4); // reserved
dbgcluts("<b>clut</b> id %d version %d<br>\n", clutId, clutVersionNumber);
while (!bs.IsEOF()) {
uchar clutEntryId = bs.GetBits(8);
bool entryClut2Flag = bs.GetBit();
bool entryClut4Flag = bs.GetBit();
bool entryClut8Flag = bs.GetBit();
bs.SkipBits(4); // reserved
uchar yval;
uchar crval;
uchar cbval;
uchar tval;
if (bs.GetBit()) { // full_range_flag
yval = bs.GetBits(8);
crval = bs.GetBits(8);
cbval = bs.GetBits(8);
tval = bs.GetBits(8);
}
else {
yval = bs.GetBits(6) << 2;
crval = bs.GetBits(4) << 4;
cbval = bs.GetBits(4) << 4;
tval = bs.GetBits(2) << 6;
}
tColor value = 0;
if (yval) {
value = yuv2rgb(yval, cbval, crval);
value |= ((10 - (clutEntryId ? Setup.SubtitleFgTransparency : Setup.SubtitleBgTransparency)) * (255 - tval) / 10) << 24;
}
dbgcluts("%2d %d %d %d %08X<br>\n", clutEntryId, entryClut2Flag ? 2 : 0, entryClut4Flag ? 4 : 0, entryClut8Flag ? 8 : 0, value);
if (entryClut2Flag)
SetColor(2, clutEntryId, value);
if (entryClut4Flag)
SetColor(4, clutEntryId, value);
if (entryClut8Flag)
SetColor(8, clutEntryId, value);
}
}
void cSubtitleClut::ParsePgs(cBitStream &bs)
{
int Version = bs.GetBits(8);
if (clutVersionNumber == Version)
return; // no update
clutVersionNumber = Version;
dbgcluts("<b>clut</b> id %d version %d<br>\n", clutId, clutVersionNumber);
for (int i = 0; i < 256; ++i)
SetColor(8, i, ArgbToColor(0, 0, 0, 0));
while (!bs.IsEOF()) {
uchar clutEntryId = bs.GetBits(8);
uchar yval = bs.GetBits(8);
uchar crval = bs.GetBits(8);
uchar cbval = bs.GetBits(8);
uchar tval = bs.GetBits(8);
tColor value = 0;
if (yval) {
value = yuv2rgb(yval, cbval, crval);
value |= ((10 - (clutEntryId ? Setup.SubtitleFgTransparency : Setup.SubtitleBgTransparency)) * tval / 10) << 24;
}
dbgcluts("%2d %08X<br>\n", clutEntryId, value);
SetColor(8, clutEntryId, value);
}
}
tColor cSubtitleClut::yuv2rgb(int Y, int Cb, int Cr)
{
int Ey, Epb, Epr;
int Eg, Eb, Er;
Ey = (Y - 16);
Epb = (Cb - 128);
Epr = (Cr - 128);
/* ITU-R 709 */
Er = constrain((298 * Ey + 460 * Epr) / 256, 0, 255);
Eg = constrain((298 * Ey - 55 * Epb - 137 * Epr) / 256, 0, 255);
Eb = constrain((298 * Ey + 543 * Epb ) / 256, 0, 255);
return (Er << 16) | (Eg << 8) | Eb;
}
void cSubtitleClut::SetColor(int Bpp, int Index, tColor Color)
{
switch (Bpp) {
case 2: palette2.SetColor(Index, Color); break;
case 4: palette4.SetColor(Index, Color); break;
case 8: palette8.SetColor(Index, Color); break;
default: esyslog("ERROR: wrong Bpp in cSubtitleClut::SetColor(%d, %d, %08X)", Bpp, Index, Color);
}
}
const cPalette *cSubtitleClut::GetPalette(int Bpp)
{
switch (Bpp) {
case 2: return &palette2;
case 4: return &palette4;
case 8: return &palette8;
default: esyslog("ERROR: wrong Bpp in cSubtitleClut::GetPalette(%d)", Bpp);
}
return &palette8;
}
// --- cSubtitleObject -------------------------------------------------------
class cSubtitleObject : public cListObject {
private:
int objectId;
int objectVersionNumber;
int objectCodingMethod;
bool nonModifyingColorFlag;
int topLength;
int botLength;
int topIndex;
uchar *topData;
uchar *botData;
char *txtData;
int lineHeight;
void DrawLine(cBitmap *Bitmap, int x, int y, tIndex Index, int Length);
bool Decode2BppCodeString(cBitmap *Bitmap, int px, int py, cBitStream *bs, int&x, int y, const uint8_t *MapTable);
bool Decode4BppCodeString(cBitmap *Bitmap, int px, int py, cBitStream *bs, int&x, int y, const uint8_t *MapTable);
bool Decode8BppCodeString(cBitmap *Bitmap, int px, int py, cBitStream *bs, int&x, int y);
bool DecodePgsCodeString(cBitmap *Bitmap, int px, int py, cBitStream *bs, int&x, int y);
void DecodeSubBlock(cBitmap *Bitmap, int px, int py, const uchar *Data, int Length, bool Even);
void DecodeCharacterString(const uchar *Data, int NumberOfCodes);
public:
cSubtitleObject(int ObjectId);
~cSubtitleObject();
void Parse(cBitStream &bs);
void ParsePgs(cBitStream &bs);
int ObjectId(void) { return objectId; }
int ObjectVersionNumber(void) { return objectVersionNumber; }
int ObjectCodingMethod(void) { return objectCodingMethod; }
bool NonModifyingColorFlag(void) { return nonModifyingColorFlag; }
void Render(cBitmap *Bitmap, int px, int py, tIndex IndexFg, tIndex IndexBg);
};
cSubtitleObject::cSubtitleObject(int ObjectId)
{
objectId = ObjectId;
objectVersionNumber = -1;
objectCodingMethod = -1;
nonModifyingColorFlag = false;
topLength = 0;
botLength = 0;
topIndex = 0;
topData = NULL;
botData = NULL;
txtData = NULL;
lineHeight = 26; // configurable subtitling font size?
}
cSubtitleObject::~cSubtitleObject()
{
free(topData);
free(botData);
free(txtData);
}
void cSubtitleObject::Parse(cBitStream &bs)
{
int Version = bs.GetBits(4);
#ifndef FIX_SUBTITLE_VERSION_BROADCASTER_STUPIDITY
if (objectVersionNumber == Version)
return; // no update
#endif
objectVersionNumber = Version;
objectCodingMethod = bs.GetBits(2);
nonModifyingColorFlag = bs.GetBit();
bs.SkipBit(); // reserved
dbgobjects("<b>object</b> id %d version %d method %d modify %d", objectId, objectVersionNumber, objectCodingMethod, nonModifyingColorFlag); // no "<br>\n" here, DecodeCharacterString() may add data
if (objectCodingMethod == 0) { // coding of pixels
topLength = bs.GetBits(16);
botLength = bs.GetBits(16);
free(topData);
if ((topData = MALLOC(uchar, topLength)) != NULL)
memcpy(topData, bs.GetData(), topLength);
else
topLength = 0;
free(botData);
if ((botData = MALLOC(uchar, botLength)) != NULL)
memcpy(botData, bs.GetData() + topLength, botLength);
else
botLength = 0;
bs.WordAlign();
}
else if (objectCodingMethod == 1) { // coded as a string of characters
int numberOfCodes = bs.GetBits(8);
DecodeCharacterString(bs.GetData(), numberOfCodes);
}
dbgobjects("<br>\n");
if (DebugObjects) {
// We can't get the actual clut here, so we use a default one. This may lead to
// funny colors, but we just want to get a rough idea of what's in the object, anyway.
cSubtitleClut Clut(0);
cBitmap b(1920, 1080, 8);
b.Replace(*Clut.GetPalette(b.Bpp()));
b.Clean();
Render(&b, 0, 0, 0, 1);
int x1, y1, x2, y2;
if (b.Dirty(x1, y1, x2, y2)) {
cString ImgName = SD.WriteJpeg(&b, x2, y2);
dbgobjects("<img src=\"%s\"><br>\n", *ImgName);
}
}
}
void cSubtitleObject::ParsePgs(cBitStream &bs)
{
int Version = bs.GetBits(8);
if (objectVersionNumber == Version)
return; // no update
objectVersionNumber = Version;
objectCodingMethod = 0;
int sequenceDescriptor = bs.GetBits(8);
if (!(sequenceDescriptor & 0x80) && topData != NULL) {
memcpy(topData + topIndex, bs.GetData(), (bs.Length() - bs.Index()) / 8);
topIndex += (bs.Length() - bs.Index()) / 8;
return;
}
topLength = bs.GetBits(24) - 4 + 1; // exclude width / height, add sub block type
bs.SkipBits(32);
if ((topData = MALLOC(uchar, topLength)) != NULL) {
topData[topIndex++] = 0xFF; // PGS end of line
memcpy(topData + 1, bs.GetData(), (bs.Length() - bs.Index()) / 8);
topIndex += (bs.Length() - bs.Index()) / 8 + 1;
}
dbgobjects("<b>object</b> id %d version %d method %d modify %d", objectId, objectVersionNumber, objectCodingMethod, nonModifyingColorFlag);
}
void cSubtitleObject::DecodeCharacterString(const uchar *Data, int NumberOfCodes)
{
// "ETSI EN 300 743 V1.3.1 (2006-11)", chapter 7.2.5 "Object data segment" specifies
// character_code to be a 16-bit index number into the character table identified
// in the subtitle_descriptor. However, the "subtitling_descriptor" <sic> according to
// "ETSI EN 300 468 V1.13.1 (2012-04)" doesn't contain a "character table identifier".
// It only contains a three letter language code, without any specification as to how
// this is related to a specific character table.
// Apparently the first "code" in textual subtitles contains the character table
// identifier, and all codes are 8-bit only. So let's first make Data a string of
// 8-bit characters:
if (NumberOfCodes > 0) {
char txt[NumberOfCodes + 1];
for (int i = 0; i < NumberOfCodes; i++)
txt[i] = Data[i * 2 + 1];
txt[NumberOfCodes] = 0;
const uchar *from = (uchar *)txt;
int len = NumberOfCodes;
const char *CharacterTable = SI::getCharacterTable(from, len);
dbgobjects(" table %s raw '%s'", CharacterTable, from);
cCharSetConv conv(CharacterTable, cCharSetConv::SystemCharacterTable());
const char *s = conv.Convert((const char *)from);
dbgobjects(" conv '%s'", s);
free(txtData);
txtData = strdup(s);
}
}
void cSubtitleObject::DecodeSubBlock(cBitmap *Bitmap, int px, int py, const uchar *Data, int Length, bool Even)
{
int x = 0;
int y = Even ? 0 : 1;
uint8_t map2to4[ 4] = { 0x00, 0x07, 0x08, 0x0F };
uint8_t map2to8[ 4] = { 0x00, 0x77, 0x88, 0xFF };
uint8_t map4to8[16] = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF };
const uint8_t *mapTable = NULL;
cBitStream bs(Data, Length * 8);
while (!bs.IsEOF()) {
switch (bs.GetBits(8)) {
case 0x10:
dbgpixel("2-bit / pixel code string<br>\n");
switch (Bitmap->Bpp()) {
case 8: mapTable = map2to8; break;
case 4: mapTable = map2to4; break;
default: mapTable = NULL; break;
}
while (Decode2BppCodeString(Bitmap, px, py, &bs, x, y, mapTable) && !bs.IsEOF())
;
bs.ByteAlign();
break;
case 0x11:
dbgpixel("4-bit / pixel code string<br>\n");
switch (Bitmap->Bpp()) {
case 8: mapTable = map4to8; break;
default: mapTable = NULL; break;
}
while (Decode4BppCodeString(Bitmap, px, py, &bs, x, y, mapTable) && !bs.IsEOF())
;
bs.ByteAlign();
break;
case 0x12:
dbgpixel("8-bit / pixel code string<br>\n");
while (Decode8BppCodeString(Bitmap, px, py, &bs, x, y) && !bs.IsEOF())
;
break;
case 0x20:
dbgpixel("sub block 2 to 4 map<br>\n");
for (int i = 0; i < 4; ++i)
map2to4[i] = bs.GetBits(4);
break;
case 0x21:
dbgpixel("sub block 2 to 8 map<br>\n");
for (int i = 0; i < 4; ++i)
map2to8[i] = bs.GetBits(8);
break;
case 0x22:
dbgpixel("sub block 4 to 8 map<br>\n");
for (int i = 0; i < 16; ++i)
map4to8[i] = bs.GetBits(8);
break;
case 0xF0:
dbgpixel("end of object line<br>\n");
x = 0;
y += 2;
break;
case 0xFF:
dbgpixel("PGS code string, including EOLs<br>\n");
while (DecodePgsCodeString(Bitmap, px, py, &bs, x, y) && !bs.IsEOF()) {
x = 0;
y++;
}
break;
default: dbgpixel("unknown sub block %s %d<br>\n", __FUNCTION__, __LINE__);
}
}
}
void cSubtitleObject::DrawLine(cBitmap *Bitmap, int x, int y, tIndex Index, int Length)
{
if (nonModifyingColorFlag && Index == 1)
return;
for (int pos = x; pos < x + Length; pos++)
Bitmap->SetIndex(pos, y, Index);
}
bool cSubtitleObject::Decode2BppCodeString(cBitmap *Bitmap, int px, int py, cBitStream *bs, int &x, int y, const uint8_t *MapTable)
{
int rl = 0;
int color = 0;
uchar code = bs->GetBits(2);
if (code) {
color = code;
rl = 1;
}
else if (bs->GetBit()) { // switch_1
rl = bs->GetBits(3) + 3;
color = bs->GetBits(2);
}
else if (bs->GetBit()) // switch_2
rl = 1; //color 0
else {
switch (bs->GetBits(2)) { // switch_3
case 0:
return false;
case 1:
rl = 2; //color 0
break;
case 2:
rl = bs->GetBits(4) + 12;
color = bs->GetBits(2);
break;
case 3:
rl = bs->GetBits(8) + 29;
color = bs->GetBits(2);
break;
default: ;
}
}
if (MapTable)
color = MapTable[color];
DrawLine(Bitmap, px + x, py + y, color, rl);
x += rl;
return true;
}
bool cSubtitleObject::Decode4BppCodeString(cBitmap *Bitmap, int px, int py, cBitStream *bs, int &x, int y, const uint8_t *MapTable)
{
int rl = 0;
int color = 0;
uchar code = bs->GetBits(4);
if (code) {
color = code;
rl = 1;
}
else if (bs->GetBit() == 0) { // switch_1
code = bs->GetBits(3);
if (code)
rl = code + 2; //color 0
else
return false;
}
else if (bs->GetBit() == 0) { // switch_2
rl = bs->GetBits(2) + 4;
color = bs->GetBits(4);
}
else {
switch (bs->GetBits(2)) { // switch_3
case 0: // color 0
rl = 1;
break;
case 1: // color 0
rl = 2;
break;
case 2:
rl = bs->GetBits(4) + 9;
color = bs->GetBits(4);
break;
case 3:
rl = bs->GetBits(8) + 25;
color = bs->GetBits(4);
break;
}
}
if (MapTable)
color = MapTable[color];
DrawLine(Bitmap, px + x, py + y, color, rl);
x += rl;
return true;
}
bool cSubtitleObject::Decode8BppCodeString(cBitmap *Bitmap, int px, int py, cBitStream *bs, int &x, int y)
{
int rl = 0;
int color = 0;
uchar code = bs->GetBits(8);
if (code) {
color = code;
rl = 1;
}
else if (bs->GetBit()) {
rl = bs->GetBits(7);
color = bs->GetBits(8);
}
else {
code = bs->GetBits(7);
if (code)
rl = code; // color 0
else
return false;
}
DrawLine(Bitmap, px + x, py + y, color, rl);
x += rl;
return true;
}
bool cSubtitleObject::DecodePgsCodeString(cBitmap *Bitmap, int px, int py, cBitStream *bs, int &x, int y)
{
while (!bs->IsEOF()) {
int color = bs->GetBits(8);
int rl = 1;
if (!color) {
int flags = bs->GetBits(8);
rl = flags & 0x3f;
if (flags & 0x40)
rl = (rl << 8) + bs->GetBits(8);
color = flags & 0x80 ? bs->GetBits(8) : 0;
}
if (rl > 0) {
DrawLine(Bitmap, px + x, py + y, color, rl);
x += rl;
}
else if (!rl)
return true;
}
return false;
}
void cSubtitleObject::Render(cBitmap *Bitmap, int px, int py, tIndex IndexFg, tIndex IndexBg)
{
if (objectCodingMethod == 0) { // coding of pixels
DecodeSubBlock(Bitmap, px, py, topData, topLength, true);
if (botLength)
DecodeSubBlock(Bitmap, px, py, botData, botLength, false);
else
DecodeSubBlock(Bitmap, px, py, topData, topLength, false);
}
else if (objectCodingMethod == 1) { // coded as a string of characters
if (txtData) {
//TODO couldn't we draw the text directly into Bitmap?
cFont *font = cFont::CreateFont(Setup.FontOsd, Setup.FontOsdSize);
cBitmap tmp(font->Width(txtData), font->Height(), Bitmap->Bpp());
double factor = (double)lineHeight / font->Height();
tmp.DrawText(0, 0, txtData, Bitmap->Color(IndexFg), Bitmap->Color(IndexBg), font);
cBitmap *scaled = tmp.Scaled(factor, factor, true);
Bitmap->DrawBitmap(px, py, *scaled);
delete scaled;
delete font;
}
}
}
// --- cSubtitleObjects ------------------------------------------------------
class cSubtitleObjects : public cList<cSubtitleObject> {
public:
cSubtitleObject *GetObjectById(int ObjectId, bool New = false);
};
cSubtitleObject *cSubtitleObjects::GetObjectById(int ObjectId, bool New)
{
for (cSubtitleObject *so = First(); so; so = Next(so)) {
if (so->ObjectId() == ObjectId)
return so;
}
if (!New)
return NULL;
cSubtitleObject *Object = new cSubtitleObject(ObjectId);
Add(Object);
return Object;
}
// --- cSubtitleObjectRef ----------------------------------------------------
class cSubtitleObjectRef : public cListObject {
protected:
int objectId;
int objectType;
int objectProviderFlag;
int objectHorizontalPosition;
int objectVerticalPosition;
int foregroundPixelCode;
int backgroundPixelCode;
public:
cSubtitleObjectRef(void);
cSubtitleObjectRef(cBitStream &bs);
int ObjectId(void) { return objectId; }
int ObjectType(void) { return objectType; }
int ObjectProviderFlag(void) { return objectProviderFlag; }
int ObjectHorizontalPosition(void) { return objectHorizontalPosition; }
int ObjectVerticalPosition(void) { return objectVerticalPosition; }
int ForegroundPixelCode(void) { return foregroundPixelCode; }
int BackgroundPixelCode(void) { return backgroundPixelCode; }
};
cSubtitleObjectRef::cSubtitleObjectRef(void)
{
objectId = 0;
objectType = 0;
objectProviderFlag = 0;
objectHorizontalPosition = 0;
objectVerticalPosition = 0;
foregroundPixelCode = 0;
backgroundPixelCode = 0;
}
cSubtitleObjectRef::cSubtitleObjectRef(cBitStream &bs)
{
objectId = bs.GetBits(16);
objectType = bs.GetBits(2);
objectProviderFlag = bs.GetBits(2);
objectHorizontalPosition = bs.GetBits(12);
bs.SkipBits(4); // reserved
objectVerticalPosition = bs.GetBits(12);
if (objectType == 0x01 || objectType == 0x02) {
foregroundPixelCode = bs.GetBits(8);
backgroundPixelCode = bs.GetBits(8);
}
else {
foregroundPixelCode = 0;
backgroundPixelCode = 0;
}
dbgregions("<b>objectref</b> id %d type %d flag %d x %d y %d fg %d bg %d<br>\n", objectId, objectType, objectProviderFlag, objectHorizontalPosition, objectVerticalPosition, foregroundPixelCode, backgroundPixelCode);
}
// --- cSubtitleObjectRefPgs - PGS variant of cSubtitleObjectRef -------------
class cSubtitleObjectRefPgs : public cSubtitleObjectRef {
private:
int windowId;
int compositionFlag;
int cropX;
int cropY;
int cropW;
int cropH;
public:
cSubtitleObjectRefPgs(cBitStream &bs);
};
cSubtitleObjectRefPgs::cSubtitleObjectRefPgs(cBitStream &bs)
:cSubtitleObjectRef()
{
objectId = bs.GetBits(16);
windowId = bs.GetBits(8);
compositionFlag = bs.GetBits(8);
bs.SkipBits(32); // skip absolute position, object is aligned to region
if ((compositionFlag & 0x80) != 0) {
cropX = bs.GetBits(16);
cropY = bs.GetBits(16);
cropW = bs.GetBits(16);
cropH = bs.GetBits(16);
}
else
cropX = cropY = cropW = cropH = 0;
dbgregions("<b>objectrefPgs</b> id %d flag %d x %d y %d cropX %d cropY %d cropW %d cropH %d<br>\n", objectId, compositionFlag, objectHorizontalPosition, objectVerticalPosition, cropX, cropY, cropW, cropH);
}
// --- cSubtitleRegion -------------------------------------------------------
class cSubtitleRegion : public cListObject {
private:
int regionId;
int regionVersionNumber;
bool regionFillFlag;
int regionWidth;
int regionHeight;
int regionLevelOfCompatibility;
int regionDepth;
int clutId;
int region8bitPixelCode;
int region4bitPixelCode;
int region2bitPixelCode;
cList<cSubtitleObjectRef> objectRefs;
public:
cSubtitleRegion(int RegionId);
void Parse(cBitStream &bs);
void ParsePgs(cBitStream &bs);
void SetDimensions(int Width, int Height);
int RegionId(void) { return regionId; }
int RegionVersionNumber(void) { return regionVersionNumber; }
bool RegionFillFlag(void) { return regionFillFlag; }
int RegionWidth(void) { return regionWidth; }
int RegionHeight(void) { return regionHeight; }
int RegionLevelOfCompatibility(void) { return regionLevelOfCompatibility; }
int RegionDepth(void) { return regionDepth; }
int ClutId(void) { return clutId; }
void Render(cBitmap *Bitmap, cSubtitleObjects *Objects);
};
cSubtitleRegion::cSubtitleRegion(int RegionId)
{
regionId = RegionId;
regionVersionNumber = -1;
regionFillFlag = false;
regionWidth = 0;
regionHeight = 0;
regionLevelOfCompatibility = 0;
regionDepth = 0;
clutId = -1;
region8bitPixelCode = 0;
region4bitPixelCode = 0;
region2bitPixelCode = 0;
}
void cSubtitleRegion::Parse(cBitStream &bs)
{
int Version = bs.GetBits(4);
#ifndef FIX_SUBTITLE_VERSION_BROADCASTER_STUPIDITY
if (regionVersionNumber == Version)
return; // no update
#endif
regionVersionNumber = Version;
regionFillFlag = bs.GetBit();
bs.SkipBits(3); // reserved
regionWidth = bs.GetBits(16);
regionHeight = bs.GetBits(16);
regionLevelOfCompatibility = 1 << bs.GetBits(3); // stored as "number of bits per pixel"
regionDepth = 1 << bs.GetBits(3); // stored as "number of bits per pixel"
bs.SkipBits(2); // reserved
clutId = bs.GetBits(8);
region8bitPixelCode = bs.GetBits(8);
region4bitPixelCode = bs.GetBits(4);
region2bitPixelCode = bs.GetBits(2);
bs.SkipBits(2); // reserved
dbgregions("<b>region</b> id %d version %d fill %d width %d height %d level %d depth %d clutId %d<br>\n", regionId, regionVersionNumber, regionFillFlag, regionWidth, regionHeight, regionLevelOfCompatibility, regionDepth, clutId);
// no objectRefs.Clear() here!
while (!bs.IsEOF())
objectRefs.Add(new cSubtitleObjectRef(bs));
}
void cSubtitleRegion::ParsePgs(cBitStream &bs)
{
regionDepth = 8;
bs.SkipBits(8); // skip palette update flag
clutId = bs.GetBits(8);
dbgregions("<b>region</b> id %d version %d clutId %d<br>\n", regionId, regionVersionNumber, clutId);
int objects = bs.GetBits(8);
while (objects--)
objectRefs.Add(new cSubtitleObjectRefPgs(bs));
}
void cSubtitleRegion::SetDimensions(int Width, int Height)
{
regionWidth = Width;
regionHeight = Height;
dbgregions("<b>region</b> id %d width %d height %d<br>\n", regionId, regionWidth, regionHeight);
}
void cSubtitleRegion::Render(cBitmap *Bitmap, cSubtitleObjects *Objects)
{
if (regionFillFlag) {
switch (Bitmap->Bpp()) {
case 2: Bitmap->Fill(region2bitPixelCode); break;
case 4: Bitmap->Fill(region4bitPixelCode); break;
case 8: Bitmap->Fill(region8bitPixelCode); break;
default: dbgregions("unknown bpp %d (%s %d)<br>\n", Bitmap->Bpp(), __FUNCTION__, __LINE__);
}
}
for (cSubtitleObjectRef *sor = objectRefs.First(); sor; sor = objectRefs.Next(sor)) {
if (cSubtitleObject *so = Objects->GetObjectById(sor->ObjectId())) {
so->Render(Bitmap, sor->ObjectHorizontalPosition(), sor->ObjectVerticalPosition(), sor->ForegroundPixelCode(), sor->BackgroundPixelCode());
}
}
}
// --- cSubtitleRegionRef ----------------------------------------------------
class cSubtitleRegionRef : public cListObject {
private:
int regionId;
int regionHorizontalAddress;
int regionVerticalAddress;
public:
cSubtitleRegionRef(int id, int x, int y);
cSubtitleRegionRef(cBitStream &bs);
int RegionId(void) { return regionId; }
int RegionHorizontalAddress(void) { return regionHorizontalAddress; }
int RegionVerticalAddress(void) { return regionVerticalAddress; }
};
cSubtitleRegionRef::cSubtitleRegionRef(int id, int x, int y)
{
regionId = id;
regionHorizontalAddress = x;
regionVerticalAddress = y;
dbgpages("<b>regionref</b> id %d tx %d y %d<br>\n", regionId, regionHorizontalAddress, regionVerticalAddress);
}
cSubtitleRegionRef::cSubtitleRegionRef(cBitStream &bs)
{
regionId = bs.GetBits(8);
bs.SkipBits(8); // reserved
regionHorizontalAddress = bs.GetBits(16);
regionVerticalAddress = bs.GetBits(16);
dbgpages("<b>regionref</b> id %d tx %d y %d<br>\n", regionId, regionHorizontalAddress, regionVerticalAddress);
}
// --- cDvbSubtitlePage ------------------------------------------------------
class cDvbSubtitlePage : public cListObject {
private:
int pageId;
int pageTimeout;
int pageVersionNumber;
int pageState;
int64_t pts;
bool pending;
cSubtitleObjects objects;
cList<cSubtitleClut> cluts;
cList<cSubtitleRegion> regions;
cList<cSubtitleRegionRef> regionRefs;
public:
cDvbSubtitlePage(int PageId);
void Parse(int64_t Pts, cBitStream &bs);
void ParsePgs(int64_t Pts, cBitStream &bs);
int PageId(void) { return pageId; }
int PageTimeout(void) { return pageTimeout; }
int PageVersionNumber(void) { return pageVersionNumber; }
int PageState(void) { return pageState; }
int64_t Pts(void) const { return pts; }
bool Pending(void) { return pending; }
cSubtitleObjects *Objects(void) { return &objects; }
tArea *GetAreas(int &NumAreas);
tArea CombineAreas(int NumAreas, const tArea *Areas);
tArea ScaleArea(const tArea &Area, double FactorX, double FactorY);
cSubtitleObject *GetObjectById(int ObjectId, bool New = false);
cSubtitleClut *GetClutById(int ClutId, bool New = false);