int ParserMpeg2Video::parsePayload(unsigned char* data, int length) {
// lookup sequence start code
int o = findStartCode(data, length, 0, MPEG2_SEQUENCE_START);
if(o >= 0) {
// skip sequence start code
o += 4;
// parse picture sequence (width, height, aspect, duration)
parseSequenceStart(data + o, length - 4);
}
// just to be sure, exit if there's isn't any duration
if(m_duration == 0) {
return length;
}
// check for picture start codes
int s = findStartCode(data, length, 0, MPEG2_PICTURE_START);
// abort if there isn't any picture information
if(s == -1) {
return length;
}
int e = findStartCode(data, length, s + 4, MPEG2_PICTURE_START);
o = s;
s = 0;
// divide this packet into frames
while(e != -1) {
// parse and send payload data
m_frameType = parsePicture(data + o, e - o);
Parser::sendPayload(data + s, e - s);
// get next picture offsets
s = e;
o = s;
e = findStartCode(data, length, s + 4, MPEG2_PICTURE_START);
// increment timestamps
m_curPts = DVD_NOPTS_VALUE;
m_curDts = PtsAdd(m_curDts, m_duration);
}
// append last part
m_frameType = parsePicture(data + o, length - o);
Parser::sendPayload(data + s, length - s);
return length;
}
void BatchSyncMetadata::parseList()
{
if (!d->everStarted)
{
QString message;
if (d->direction == WriteFromDatabaseToFile)
{
message = i18n("Synchronizing image metadata with database. Please wait...");
}
else
{
message = i18n("Updating database from image metadata. Please wait...");
}
emit signalProgressBarMode(StatusProgressBar::CancelProgressBarMode, message);
d->everStarted = true;
}
d->running = true;
while (d->imageInfoIndex != d->imageInfoList.size() && !d->cancel)
{
parsePicture();
kapp->processEvents();
}
d->running = false;
if (d->cancel ||
(d->imageInfoJob && !d->imageInfoJob->isRunning()) ||
!d->imageInfoJob
)
{
complete();
}
}
/// The first coded picture in a group of pictures is an I-Picture.
/// The order of the pictures in the coded stream is the order in
/// which the decoder processes them in normal play. In particular,
/// adjacent B-Pictures in the coded stream are in display order.
/// The last coded picture, in display order, of a group of pictures
/// is either an I-Picture or a P-Picture.
void Decoder::parseGroupOfPictures()
{
m_input->skipBits(32); // groupStartCode
m_input->skipBits(25); // timeCode
bool closedGop = m_input->getBool();
m_input->getBool(); // brokenLink
nextStartCode();
if (m_input->nextBits(32) == ExtensionStartCode)
{
m_input->getBits(32);
while (m_input->nextBits(24) != StartCode)
{
m_input->getBits(8); // groupExtensionData
}
nextStartCode();
}
if (m_input->nextBits(32) == UserDataStartCode)
{
m_input->getBits(32);
while (m_input->nextBits(24) != StartCode)
{
m_input->getBits(8); // userData
}
nextStartCode();
}
// Reset picture store indexes
if (closedGop)
{
m_previous = m_future = -1;
}
do
{
parsePicture();
// Send picture to player
m_renderer->pushPicture(m_currentPicture, m_pictureCodingType);
// Store current picture in Previous or Future Picture Store
// Refer to section 2-D.2.4
if (m_pictureCodingType == VideoPicture::PictureCodingI || m_pictureCodingType == VideoPicture::PictureCodingP)
{
if (m_previous == -1)
{
m_previous = m_current;
}
else if (m_future == -1)
{
m_future = m_current;
}
else
{
m_future = m_current;
}
m_current = (m_current + 1) % 3;
}
m_currentPicture = m_videoPictureStore[m_current];
if(m_previous >= 0)
m_previousPicture = m_videoPictureStore[m_previous];
if(m_future >= 0)
m_futurePicture = m_videoPictureStore[m_future];
} while (m_input->nextBits(32) == PictureStartCode);
}
