/** \fn PreviewGenerator::GetScreenGrab(const ProgramInfo*, const QString&,
long long, bool, int&, int&, int&, float&)
* \brief Returns a PIX_FMT_RGBA32 buffer containg a frame from the video.
*
* \param pginfo Recording to grab from.
* \param filename File containing recording.
* \param seektime Seconds or frames into the video to seek before
* capturing a frame.
* \param time_in_secs if true time is in seconds, otherwise it is in frames.
* \param bufferlen Returns size of buffer returned (in bytes).
* \param video_width Returns width of frame grabbed.
* \param video_height Returns height of frame grabbed.
* \param video_aspect Returns aspect ratio of frame grabbed.
* \return Buffer allocated with new containing frame in RGBA32 format if
* successful, NULL otherwise.
*/
char *PreviewGenerator::GetScreenGrab(
const ProgramInfo *pginfo, const QString &filename,
long long seektime, bool time_in_secs,
int &bufferlen,
int &video_width, int &video_height, float &video_aspect)
{
(void) pginfo;
(void) filename;
(void) seektime;
(void) time_in_secs;
(void) bufferlen;
(void) video_width;
(void) video_height;
char *retbuf = NULL;
bufferlen = 0;
#ifdef USING_FRONTEND
if (!MSqlQuery::testDBConnection())
{
VERBOSE(VB_IMPORTANT, LOC_ERR + "Previewer could not connect to DB.");
return NULL;
}
// pre-test local files for existence and size. 500 ms speed-up...
if (filename.left(1)=="/")
{
QFileInfo info(filename);
bool invalid = !info.exists() || !info.isReadable() || !info.isFile();
if (!invalid)
{
// Check size too, QFileInfo can not handle large files
unsigned long long fsize =
myth_get_approximate_large_file_size(filename);
invalid = (fsize < 8*1024);
}
if (invalid)
{
VERBOSE(VB_IMPORTANT, LOC_ERR + "Previewer file " +
QString("'%1'").arg(filename) + " is not valid.");
return NULL;
}
}
RingBuffer *rbuf = new RingBuffer(filename, false, false, 0);
if (!rbuf->IsOpen())
{
VERBOSE(VB_IMPORTANT, LOC_ERR + "Previewer could not open file: " +
QString("'%1'").arg(filename));
delete rbuf;
return NULL;
}
NuppelVideoPlayer *nvp = new NuppelVideoPlayer(kInUseID, pginfo);
nvp->SetRingBuffer(rbuf);
if (time_in_secs)
retbuf = nvp->GetScreenGrab(seektime, bufferlen,
video_width, video_height, video_aspect);
else
retbuf = nvp->GetScreenGrabAtFrame(
seektime, true, bufferlen,
video_width, video_height, video_aspect);
delete nvp;
delete rbuf;
#else // USING_FRONTEND
QString msg = "Backend compiled without USING_FRONTEND !!!!";
VERBOSE(VB_IMPORTANT, LOC_ERR + msg);
#endif // USING_FRONTEND
if (retbuf)
{
VERBOSE(VB_GENERAL, LOC +
QString("Grabbed preview '%0' %1x%2@%3%4")
.arg(filename).arg(video_width).arg(video_height)
.arg((Q_LLONG)seektime).arg((time_in_secs) ? "s" : "f"));
}
return retbuf;
}
/**
* \brief Returns a PIX_FMT_RGBA32 buffer containg a frame from the video.
*
* \param pginfo Recording to grab from.
* \param filename File containing recording.
* \param seektime Seconds or frames into the video to seek before
* capturing a frame.
* \param time_in_secs if true time is in seconds, otherwise it is in frames.
* \param bufferlen Returns size of buffer returned (in bytes).
* \param video_width Returns width of frame grabbed.
* \param video_height Returns height of frame grabbed.
* \param video_aspect Returns aspect ratio of frame grabbed.
* \return Buffer allocated with new containing frame in RGBA32 format if
* successful, NULL otherwise.
*/
char *PreviewGenerator::GetScreenGrab(
const ProgramInfo &pginfo, const QString &filename,
long long seektime, bool time_in_secs,
int &bufferlen,
int &video_width, int &video_height, float &video_aspect)
{
(void) pginfo;
(void) filename;
(void) seektime;
(void) time_in_secs;
(void) bufferlen;
(void) video_width;
(void) video_height;
char *retbuf = NULL;
bufferlen = 0;
if (!MSqlQuery::testDBConnection())
{
LOG(VB_GENERAL, LOG_ERR, LOC + "Previewer could not connect to DB.");
return NULL;
}
// pre-test local files for existence and size. 500 ms speed-up...
if (filename.left(1)=="/")
{
QFileInfo info(filename);
bool invalid = (!info.exists() || !info.isReadable() ||
(info.isFile() && (info.size() < 8*1024)));
if (invalid)
{
LOG(VB_GENERAL, LOG_ERR, LOC + "Previewer file " +
QString("'%1'").arg(filename) + " is not valid.");
return NULL;
}
}
RingBuffer *rbuf = RingBuffer::Create(filename, false, false, 0);
if (!rbuf->IsOpen())
{
LOG(VB_GENERAL, LOG_ERR, LOC + "Previewer could not open file: " +
QString("'%1'").arg(filename));
delete rbuf;
return NULL;
}
PlayerContext *ctx = new PlayerContext(kPreviewGeneratorInUseID);
ctx->SetRingBuffer(rbuf);
ctx->SetPlayingInfo(&pginfo);
ctx->SetPlayer(new MythPlayer());
ctx->player->SetPlayerInfo(NULL, NULL, true, ctx);
if (time_in_secs)
retbuf = ctx->player->GetScreenGrab(seektime, bufferlen,
video_width, video_height, video_aspect);
else
retbuf = ctx->player->GetScreenGrabAtFrame(
seektime, true, bufferlen,
video_width, video_height, video_aspect);
delete ctx;
if (retbuf)
{
LOG(VB_GENERAL, LOG_INFO, LOC +
QString("Grabbed preview '%0' %1x%2@%3%4")
.arg(filename).arg(video_width).arg(video_height)
.arg(seektime).arg((time_in_secs) ? "s" : "f"));
}
return retbuf;
}