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dvbspu.c
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dvbspu.c
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/*
* SPU decoder for DVB devices
*
* Copyright (C) 2001.2002 Andreas Schultz <[email protected]>
*
* This code is distributed under the terms and conditions of the
* GNU GENERAL PUBLIC LICENSE. See the file COPYING for details.
*
* parts of this file are derived from the OMS program.
*
* $Id: dvbspu.c 4.1 2020/12/18 14:51:57 kls Exp $
*/
#include "dvbspu.h"
#include <assert.h>
#include <string.h>
#include <inttypes.h>
#include <math.h>
/*
* cDvbSpubitmap:
*
* this is a bitmap of the full screen and two palettes
* the normal palette for the background and the highlight palette
*
* Inputs:
* - a SPU rle encoded image on creation, which will be decoded into
* the full screen indexed bitmap
*
* Output:
* - a minimal sized cDvbSpuBitmap a given palette, the indexed bitmap
* will be scanned to get the smallest possible resulting bitmap considering
* transparencies
*/
// #define SPUDEBUG
#ifdef SPUDEBUG
#define DEBUG(format, args...) printf (format, ## args)
#else
#define DEBUG(format, args...) void()
#endif
// --- cDvbSpuPalette---------------------------------------------------------
void cDvbSpuPalette::setPalette(const uint32_t * pal)
{
for (int i = 0; i < 16; i++)
palette[i] = yuv2rgb(pal[i]);
}
// --- cDvbSpuBitmap ---------------------------------------------------------
#define setMin(a, b) if (a > b) a = b
#define setMax(a, b) if (a < b) a = b
// DVD SPU bitmaps cover max. 720 x 576 - this sizes the SPU bitmap
#define spuXres 720
#define spuYres 576
#define revRect(r1, r2) { r1.x1 = r2.x2; r1.y1 = r2.y2; r1.x2 = r2.x1; r1.y2 = r2.y1; }
cDvbSpuBitmap::cDvbSpuBitmap(sDvbSpuRect size,
uint8_t * fodd, uint8_t * eodd,
uint8_t * feven, uint8_t * eeven)
{
size.x1 = max(size.x1, 0);
size.y1 = max(size.y1, 0);
size.x2 = min(size.x2, spuXres - 1);
size.y2 = min(size.y2, spuYres - 1);
bmpsize = size;
revRect(minsize[0], size);
revRect(minsize[1], size);
revRect(minsize[2], size);
revRect(minsize[3], size);
int MemSize = spuXres * spuYres * sizeof(uint8_t);
bmp = new uint8_t[MemSize];
if (bmp)
memset(bmp, 0, MemSize);
putFieldData(0, fodd, eodd);
putFieldData(1, feven, eeven);
}
cDvbSpuBitmap::~cDvbSpuBitmap()
{
delete[]bmp;
}
cBitmap *cDvbSpuBitmap::getBitmap(const aDvbSpuPalDescr paldescr,
const cDvbSpuPalette & pal,
sDvbSpuRect & size) const
{
int h = size.height();
int w = size.width();
if (size.y1 + h >= spuYres)
h = spuYres - size.y1 - 1;
if (size.x1 + w >= spuXres)
w = spuXres - size.x1 - 1;
if (w & 0x03)
w += 4 - (w & 0x03);
cBitmap *ret = new cBitmap(w, h, 2);
// set the palette
for (int i = 0; i < 4; i++) {
uint32_t color =
pal.getColor(paldescr[i].index, paldescr[i].trans);
ret->SetColor(i, (tColor) color);
}
// set the content
if (bmp) {
for (int yp = 0; yp < h; yp++) {
for (int xp = 0; xp < w; xp++) {
uint8_t idx = bmp[(size.y1 + yp) * spuXres + size.x1 + xp];
ret->SetIndex(xp, yp, idx);
}
}
}
return ret;
}
// find the minimum non-transparent area
bool cDvbSpuBitmap::getMinSize(const aDvbSpuPalDescr paldescr,
sDvbSpuRect & size) const
{
bool ret = false;
for (int i = 0; i < 4; i++) {
if (paldescr[i].trans != 0) {
if (!ret)
size = minsize[i];
else {
setMin(size.x1, minsize[i].x1);
setMin(size.y1, minsize[i].y1);
setMax(size.x2, minsize[i].x2);
setMax(size.y2, minsize[i].y2);
}
ret = true;
}
}
if (ret)
DEBUG("MinSize: (%d, %d) x (%d, %d)\n",
size.x1, size.y1, size.x2, size.y2);
if (size.x1 > size.x2 || size.y1 > size.y2)
return false;
return ret;
}
void cDvbSpuBitmap::putPixel(int xp, int yp, int len, uint8_t colorid)
{
if (bmp)
memset(bmp + spuXres * yp + xp, colorid, len);
setMin(minsize[colorid].x1, xp);
setMin(minsize[colorid].y1, yp);
setMax(minsize[colorid].x2, xp + len - 1);
setMax(minsize[colorid].y2, yp);
}
static uint8_t getBits(uint8_t * &data, uint8_t & bitf)
{
uint8_t ret = *data;
if (bitf)
ret >>= 4;
else
data++;
bitf ^= 1;
return (ret & 0xf);
}
void cDvbSpuBitmap::putFieldData(int field, uint8_t * data, uint8_t * endp)
{
int xp = bmpsize.x1;
int yp = bmpsize.y1 + field;
uint8_t bitf = 1;
while (data < endp) {
uint16_t vlc = getBits(data, bitf);
if (vlc < 0x0004) {
vlc = (vlc << 4) | getBits(data, bitf);
if (vlc < 0x0010) {
vlc = (vlc << 4) | getBits(data, bitf);
if (vlc < 0x0040) {
vlc = (vlc << 4) | getBits(data, bitf);
}
}
}
uint8_t color = vlc & 0x03;
int len = vlc >> 2;
// if len == 0 -> end sequence - fill to end of line
len = len ? len : bmpsize.x2 - xp + 1;
putPixel(xp, yp, len, color);
xp += len;
if (xp > bmpsize.x2) {
// nextLine
if (!bitf)
data++;
bitf = 1;
xp = bmpsize.x1;
yp += 2;
if (yp > bmpsize.y2)
return;
}
}
}
// --- cDvbSpuDecoder---------------------------------------------------------
#define CMD_SPU_MENU 0x00
#define CMD_SPU_SHOW 0x01
#define CMD_SPU_HIDE 0x02
#define CMD_SPU_SET_PALETTE 0x03
#define CMD_SPU_SET_ALPHA 0x04
#define CMD_SPU_SET_SIZE 0x05
#define CMD_SPU_SET_PXD_OFFSET 0x06
#define CMD_SPU_CHG_COLCON 0x07
#define CMD_SPU_EOF 0xff
#define spuU32(i) ((spu[i] << 8) + spu[i+1])
cDvbSpuDecoder::cDvbSpuDecoder()
{
clean = true;
scaleMode = eSpuNormal;
spu = NULL;
osd = NULL;
spubmp = NULL;
allowedShow = false;
}
cDvbSpuDecoder::~cDvbSpuDecoder()
{
delete spubmp;
delete spu;
delete osd;
}
// SPUs must be scaled if screensize is not 720x576
void cDvbSpuDecoder::SetSpuScaling(void)
{
int Width = spuXres;
int Height = spuYres;
int OsdWidth = 0;
int OsdHeight = 0;
double VideoAspect;
cDevice::PrimaryDevice()->GetOsdSize(OsdWidth, OsdHeight, VideoAspect);
DEBUG("dvbspu SetSpuScaling OsdSize %d x %d\n", OsdWidth, OsdHeight);
if (!OsdWidth) { // guess correct size
if (Setup.OSDWidth <= 720 || Setup.OSDHeight <= 576)
xscaling = yscaling = 1.0;
else if (Setup.OSDWidth <= 1280 || Setup.OSDHeight <= 720) {
xscaling = 1280.0 / Width;
yscaling = 720.0 / Height;
}
else {
xscaling = 1920.0 / Width;
yscaling = 1080.0/ Height;
}
}
else {
xscaling = (double)OsdWidth / Width;
yscaling = (double)OsdHeight / Height;
}
DEBUG("dvbspu xscaling = %f yscaling = %f\n", xscaling, yscaling);
}
void cDvbSpuDecoder::processSPU(uint32_t pts, uint8_t * buf, bool AllowedShow)
{
setTime(pts);
DEBUG("SPU pushData: pts: %d\n", pts);
delete spubmp;
spubmp = NULL;
delete[]spu;
spu = buf;
spupts = pts;
DCSQ_offset = cmdOffs();
prev_DCSQ_offset = 0;
clean = true;
allowedShow = AllowedShow;
}
void cDvbSpuDecoder::setScaleMode(cSpuDecoder::eScaleMode ScaleMode)
{
scaleMode = ScaleMode;
}
void cDvbSpuDecoder::setPalette(uint32_t * pal)
{
palette.setPalette(pal);
}
void cDvbSpuDecoder::setHighlight(uint16_t sx, uint16_t sy,
uint16_t ex, uint16_t ey,
uint32_t palette)
{
aDvbSpuPalDescr pld;
for (int i = 0; i < 4; i++) {
pld[i].index = 0xf & (palette >> (16 + 4 * i));
pld[i].trans = 0xf & (palette >> (4 * i));
}
bool ne = hlpsize.x1 != sx || hlpsize.y1 != sy ||
hlpsize.x2 != ex || hlpsize.y2 != ey ||
pld[0] != hlpDescr[0] || pld[1] != hlpDescr[1] ||
pld[2] != hlpDescr[2] || pld[3] != hlpDescr[3];
if (ne) {
DEBUG("setHighlight: %d,%d x %d,%d\n", sx, sy, ex, ey);
hlpsize.x1 = sx;
hlpsize.y1 = sy;
hlpsize.x2 = ex;
hlpsize.y2 = ey;
memcpy(hlpDescr, pld, sizeof(aDvbSpuPalDescr));
highlight = true;
clean = false;
Draw(); // we have to trigger Draw() here
}
}
void cDvbSpuDecoder::clearHighlight(void)
{
clean &= !highlight;
highlight = false;
hlpsize.x1 = -1;
hlpsize.y1 = -1;
hlpsize.x2 = -1;
hlpsize.y2 = -1;
}
sDvbSpuRect cDvbSpuDecoder::CalcAreaSize(sDvbSpuRect fgsize, cBitmap *fgbmp, sDvbSpuRect bgsize, cBitmap *bgbmp)
{
sDvbSpuRect size;
if (fgbmp && bgbmp) {
size.x1 = min(fgsize.x1, bgsize.x1);
size.y1 = min(fgsize.y1, bgsize.y1);
size.x2 = max(fgsize.x2, bgsize.x2);
size.y2 = max(fgsize.y2, bgsize.y2);
}
else if (fgbmp) {
size.x1 = fgsize.x1;
size.y1 = fgsize.y1;
size.x2 = fgsize.x2;
size.y2 = fgsize.y2;
}
else if (bgbmp) {
size.x1 = bgsize.x1;
size.y1 = bgsize.y1;
size.x2 = bgsize.x2;
size.y2 = bgsize.y2;
}
else {
size.x1 = 0;
size.y1 = 0;
size.x2 = 0;
size.y2 = 0;
}
return size;
}
int cDvbSpuBitmap::getMinBpp(const aDvbSpuPalDescr paldescr)
{
int col = 1;
for (int i = 0; i < 4; i++) {
if (paldescr[i].trans != 0) {
col++;
}
}
return col > 2 ? 2 : 1;
}
int cDvbSpuDecoder::CalcAreaBpp(cBitmap *fgbmp, cBitmap *bgbmp)
{
int fgbpp = 0;
int bgbpp = 0;
int ret;
if (fgbmp) {
fgbpp = spubmp->getMinBpp(hlpDescr);
}
if (bgbmp) {
bgbpp = spubmp->getMinBpp(palDescr);
}
ret = fgbpp + bgbpp;
if (ret > 2)
ret = 4;
return ret;
}
void cDvbSpuDecoder::Draw(void)
{
cMutexLock MutexLock(&mutex);
if (!spubmp) {
Hide();
return;
}
sDvbSpuRect bgsize;
sDvbSpuRect drawsize;
sDvbSpuRect bgdrawsize;
cBitmap *fg = NULL;
cBitmap *bg = NULL;
cBitmap *tmp = NULL;
SetSpuScaling(); // always set current scaling, size could have changed
if (highlight) {
tmp = spubmp->getBitmap(hlpDescr, palette, hlpsize);
fg = tmp->Scaled(xscaling, yscaling, true);
drawsize.x1 = hlpsize.x1 * xscaling;
drawsize.y1 = hlpsize.y1 * yscaling;
drawsize.x2 = drawsize.x1 + fg->Width();
drawsize.y2 = drawsize.y1 + fg->Height();
}
if (spubmp->getMinSize(palDescr, bgsize)) {
tmp = spubmp->getBitmap(palDescr, palette, bgsize);
bg = tmp->Scaled(xscaling, yscaling, true);
bgdrawsize.x1 = bgsize.x1 * xscaling;
bgdrawsize.y1 = bgsize.y1 * yscaling;
bgdrawsize.x2 = bgdrawsize.x1 + bg->Width();
bgdrawsize.y2 = bgdrawsize.y1 + bg->Height();
}
if (osd) // always rewrite OSD
Hide();
if (osd == NULL) {
restricted_osd = false;
osd = cOsdProvider::NewOsd(0, 0);
sDvbSpuRect areaSize = CalcAreaSize(drawsize, fg, bgdrawsize, bg); // combine
tArea Area = { areaSize.x1, areaSize.y1, areaSize.x2, areaSize.y2, 4 };
if (osd->CanHandleAreas(&Area, 1) != oeOk) {
DEBUG("dvbspu CanHandleAreas (%d,%d)x(%d,%d), 4 failed\n", areaSize.x1, areaSize.y1, areaSize.x2, areaSize.y2);
restricted_osd = true;
}
else
osd->SetAreas(&Area, 1);
}
if (restricted_osd) {
sDvbSpuRect hlsize;
bool setarea = false;
/* reduce fg area */
if (fg) {
spubmp->getMinSize(hlpDescr,hlsize);
/* clip to the highligh area */
setMax(hlsize.x1, hlpsize.x1);
setMax(hlsize.y1, hlpsize.y1);
setMin(hlsize.x2, hlpsize.x2);
setMin(hlsize.y2, hlpsize.y2);
if (hlsize.x1 > hlsize.x2 || hlsize.y1 > hlsize.y2)
hlsize.x1 = hlsize.x2 = hlsize.y1 = hlsize.y2 = 0;
/* resize scaled fg */
drawsize.x1=hlsize.x1 * xscaling;
drawsize.y1=hlsize.y1 * yscaling;
drawsize.x2=hlsize.x2 * xscaling;
drawsize.y2=hlsize.y2 * yscaling;
}
sDvbSpuRect areaSize = CalcAreaSize(drawsize, fg, bgdrawsize, bg);
#define DIV(a, b) (a/b)?:1
for (int d = 1; !setarea && d <= 2; d++) {
/* first try old behaviour */
tArea Area = { areaSize.x1, areaSize.y1, areaSize.x2, areaSize.y2, DIV(CalcAreaBpp(fg, bg), d) };
if ((Area.Width() & 7) != 0)
Area.x2 += 8 - (Area.Width() & 7);
if (osd->CanHandleAreas(&Area, 1) == oeOk &&
osd->SetAreas(&Area, 1) == oeOk)
setarea = true;
/* second try to split area if there is both area */
if (!setarea && fg && bg) {
tArea Area_Both [2] = {
{ bgdrawsize.x1, bgdrawsize.y1, bgdrawsize.x2, bgdrawsize.y2, DIV(CalcAreaBpp(0, bg), d) },
{ drawsize.x1, drawsize.y1, drawsize.x2, drawsize.y2, DIV(CalcAreaBpp(fg, 0), d) }
};
if (!Area_Both[0].Intersects(Area_Both[1])) {
/* there is no intersection. We can try with split areas */
if ((Area_Both[0].Width() & 7) != 0)
Area_Both[0].x2 += 8 - (Area_Both[0].Width() & 7);
if ((Area_Both[1].Width() & 7) != 0)
Area_Both[1].x2 += 8 - (Area_Both[1].Width() & 7);
if (osd->CanHandleAreas(Area_Both, 2) == oeOk &&
osd->SetAreas(Area_Both, 2) == oeOk)
setarea = true;
}
}
}
if (setarea)
DEBUG("dvbspu: reduced AreaSize (%d, %d) (%d, %d) Bpp %d\n", areaSize.x1, areaSize.y1, areaSize.x2, areaSize.y2, (fg && bg) ? 4 : 2);
else
dsyslog("dvbspu: reduced AreaSize (%d, %d) (%d, %d) Bpp %d failed", areaSize.x1, areaSize.y1, areaSize.x2, areaSize.y2, (fg && bg) ? 4 : 2);
}
/* we could draw use DrawPixel on osd */
if (bg || fg) {
if (bg)
osd->DrawBitmap(bgdrawsize.x1, bgdrawsize.y1, *bg);
if (fg)
osd->DrawBitmap(drawsize.x1, drawsize.y1, *fg);
delete fg;
delete bg;
delete tmp;
osd->Flush();
}
clean = true;
}
void cDvbSpuDecoder::Hide(void)
{
cMutexLock MutexLock(&mutex);
delete osd;
osd = NULL;
}
void cDvbSpuDecoder::Empty(void)
{
Hide();
delete spubmp;
spubmp = NULL;
delete[]spu;
spu = NULL;
clearHighlight();
clean = true;
}
int cDvbSpuDecoder::setTime(uint32_t pts)
{
if (!spu)
return 0;
if (!clean)
Draw();
while (DCSQ_offset != prev_DCSQ_offset) { /* Display Control Sequences */
int i = DCSQ_offset;
state = spNONE;
uint32_t exec_time = spupts + spuU32(i) * 1024;
if ((pts != 0) && (exec_time > pts))
return 0;
DEBUG("offs = %d, rel = %d, time = %d, pts = %d, diff = %d\n",
i, spuU32(i) * 1024, exec_time, pts, exec_time - pts);
if (pts != 0) {
uint16_t feven = 0;
uint16_t fodd = 0;
i += 2;
prev_DCSQ_offset = DCSQ_offset;
DCSQ_offset = spuU32(i);
DEBUG("offs = %d, DCSQ = %d, prev_DCSQ = %d\n",
i, DCSQ_offset, prev_DCSQ_offset);
i += 2;
while (spu[i] != CMD_SPU_EOF) { // Command Sequence
switch (spu[i]) {
case CMD_SPU_SHOW: // show subpicture
DEBUG("\tshow subpicture\n");
state = spSHOW;
i++;
break;
case CMD_SPU_HIDE: // hide subpicture
DEBUG("\thide subpicture\n");
state = spHIDE;
i++;
break;
case CMD_SPU_SET_PALETTE: // CLUT
palDescr[0].index = spu[i + 2] & 0xf;
palDescr[1].index = spu[i + 2] >> 4;
palDescr[2].index = spu[i + 1] & 0xf;
palDescr[3].index = spu[i + 1] >> 4;
i += 3;
break;
case CMD_SPU_SET_ALPHA: // transparency palette
palDescr[0].trans = spu[i + 2] & 0xf;
palDescr[1].trans = spu[i + 2] >> 4;
palDescr[2].trans = spu[i + 1] & 0xf;
palDescr[3].trans = spu[i + 1] >> 4;
i += 3;
break;
case CMD_SPU_SET_SIZE: // image coordinates
size.x1 = (spu[i + 1] << 4) | (spu[i + 2] >> 4);
size.x2 = ((spu[i + 2] & 0x0f) << 8) | spu[i + 3];
size.y1 = (spu[i + 4] << 4) | (spu[i + 5] >> 4);
size.y2 = ((spu[i + 5] & 0x0f) << 8) | spu[i + 6];
DEBUG("\t(%d, %d) x (%d, %d)\n",
size.x1, size.y1, size.x2, size.y2);
i += 7;
break;
case CMD_SPU_SET_PXD_OFFSET: // image 1 / image 2 offsets
fodd = spuU32(i + 1);
feven = spuU32(i + 3);
DEBUG("\todd = %d even = %d\n", fodd, feven);
i += 5;
break;
case CMD_SPU_CHG_COLCON: {
int size = spuU32(i + 1);
i += 1 + size;
}
break;
case CMD_SPU_MENU:
DEBUG("\tspu menu\n");
state = spMENU;
i++;
break;
default:
esyslog("invalid sequence in control header (%.2x)",
spu[i]);
Empty();
return 0;
}
}
if (fodd != 0 && feven != 0) {
Hide();
delete spubmp;
spubmp = new cDvbSpuBitmap(size, spu + fodd, spu + feven,
spu + feven, spu + cmdOffs());
}
} else if (!clean)
state = spSHOW;
if ((state == spSHOW && allowedShow) || state == spMENU)
Draw();
if (state == spHIDE)
Hide();
if (pts == 0)
return 0;
}
return 1;
}