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/*
* transfer.c: Transfer mode
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: transfer.c 1.29 2005/08/13 11:19:46 kls Exp $
*/
#include "transfer.h"
#define TRANSFERBUFSIZE MEGABYTE(2)
#define POLLTIMEOUTS_BEFORE_DEVICECLEAR 6
// --- cTransfer -------------------------------------------------------------
cTransfer::cTransfer(int VPid, const int *APids, const int *DPids, const int *SPids)
:cReceiver(0, -1, VPid, APids, Setup.UseDolbyDigital ? DPids : NULL, SPids)
,cThread("transfer")
{
ringBuffer = new cRingBufferLinear(TRANSFERBUFSIZE, TS_SIZE * 2, true, "Transfer");
remux = new cRemux(VPid, APids, Setup.UseDolbyDigital ? DPids : NULL, SPids);
needsBufferReserve = Setup.UseDolbyDigital && VPid != 0 && DPids && DPids[0] != 0;
}
cTransfer::~cTransfer()
{
cReceiver::Detach();
cPlayer::Detach();
delete remux;
delete ringBuffer;
}
void cTransfer::Activate(bool On)
{
if (On)
Start();
else
Cancel(3);
}
void cTransfer::Receive(uchar *Data, int Length)
{
if (IsAttached() && Active()) {
int p = ringBuffer->Put(Data, Length);
if (p != Length && Active())
ringBuffer->ReportOverflow(Length - p);
return;
}
}
#define FW_NEEDS_BUFFER_RESERVE_FOR_AC3
#ifdef FW_NEEDS_BUFFER_RESERVE_FOR_AC3
//XXX This is a very ugly hack to allow cDvbOsd to reduce the buffer
//XXX requirements in cTransfer if it detects a 4MB full featured DVB card.
bool DvbCardWith4MBofSDRAM = false;
#endif
void cTransfer::Action(void)
{
int PollTimeouts = 0;
uchar *p = NULL;
int Result = 0;
#ifdef FW_NEEDS_BUFFER_RESERVE_FOR_AC3
bool GotBufferReserve = false;
int RequiredBufferReserve = KILOBYTE(DvbCardWith4MBofSDRAM ? 288 : 576);
#endif
while (Active()) {
#ifdef FW_NEEDS_BUFFER_RESERVE_FOR_AC3
if (needsBufferReserve && !GotBufferReserve) {
//XXX For dolby we've to fill the buffer because the firmware does
//XXX not decode dolby but use a PCM stream for transport, therefore
//XXX the firmware has not enough buffer for noiseless skipping early
//XXX PCM samples (each dolby frame requires 6144 bytes in PCM and
//XXX audio is mostly to early in comparison to video).
//XXX To resolve this, the remuxer or PlayPes() should synchronize
//XXX audio with the video frames. 2004/09/09 Werner
if (ringBuffer->Available() < RequiredBufferReserve) { // used to be MAXFRAMESIZE, but the HDTV value of KILOBYTE(512) is way too much here
cCondWait::SleepMs(20); // allow the buffer to collect some reserve
continue;
}
else
GotBufferReserve = true;
}
#endif
int Count;
uchar *b = ringBuffer->Get(Count);
if (b) {
if (ringBuffer->Available() > TRANSFERBUFSIZE * 9 / 10) {
// If the buffer runs full, we have no chance of ever catching up
// since the data comes in at the same rate as it goes out (it's "live").
// So let's clear the buffer instead of suffering from permanent
// overflows.
dsyslog("clearing transfer buffer to avoid overflows");
DeviceClear();
ringBuffer->Clear();
remux->Clear();
PlayPes(NULL, 0);
p = NULL;
#ifdef FW_NEEDS_BUFFER_RESERVE_FOR_AC3
GotBufferReserve = false;
#endif
continue;
}
Count = remux->Put(b, Count);
if (Count)
ringBuffer->Del(Count);
}
if (!p)
p = remux->Get(Result);
if (p) {
cPoller Poller;
if (DevicePoll(Poller, 100)) {
PollTimeouts = 0;
int w = PlayPes(p, Result);
if (w > 0) {
p += w;
Result -= w;
remux->Del(w);
if (Result <= 0)
p = NULL;
}
else if (w < 0 && FATALERRNO)
LOG_ERROR;
}
else {
PollTimeouts++;
if (PollTimeouts == POLLTIMEOUTS_BEFORE_DEVICECLEAR) {
dsyslog("clearing device because of consecutive poll timeouts");
DeviceClear();
ringBuffer->Clear();
remux->Clear();
PlayPes(NULL, 0);
p = NULL;
#ifdef FW_NEEDS_BUFFER_RESERVE_FOR_AC3
GotBufferReserve = false;
#endif
}
}
}
}
}
// --- cTransferControl ------------------------------------------------------
cDevice *cTransferControl::receiverDevice = NULL;
cTransferControl::cTransferControl(cDevice *ReceiverDevice, int VPid, const int *APids, const int *DPids, const int *SPids)
:cControl(transfer = new cTransfer(VPid, APids, DPids, SPids), true)
{
ReceiverDevice->AttachReceiver(transfer);
receiverDevice = ReceiverDevice;
}
cTransferControl::~cTransferControl()
{
receiverDevice = NULL;
delete transfer;
}
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