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vdr-plugin-streamdev
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vdr-plugin-streamdev/server/connection.c

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/*
* $Id: connection.c,v 1.16 2010/08/03 10:51:53 schmirl Exp $
*/
#include "server/connection.h"
#include "server/setup.h"
#include "server/suspend.h"
#include "common.h"
#include <vdr/tools.h>
#include <vdr/thread.h>
#include <vdr/transfer.h>
#include <string.h>
#include <stdarg.h>
#include <errno.h>
class cSwitchLive {
private:
cMutex mutex;
cCondWait switched;
cDevice *device;
const cChannel *channel;
public:
cDevice* Switch(cDevice *Device, const cChannel *Channel);
void Switch(void);
cSwitchLive(void);
};
cSwitchLive::cSwitchLive(): device(NULL), channel(NULL)
{
}
cDevice* cSwitchLive::Switch(cDevice *Device, const cChannel *Channel)
{
mutex.Lock();
device = Device;
channel = Channel;
mutex.Unlock();
switched.Wait();
return device;
}
void cSwitchLive::Switch(void)
{
mutex.Lock();
if (channel && device) {
cDevice::SetAvoidDevice(device);
if (!Channels.SwitchTo(cDevice::CurrentChannel())) {
if (StreamdevServerSetup.SuspendMode == smAlways) {
Channels.SwitchTo(channel->Number());
Skins.Message(mtInfo, tr("Streaming active"));
}
else {
esyslog("streamdev: Can't receive channel %d (%s) from device %d. Moving live TV to other device failed (PrimaryDevice=%d, ActualDevice=%d)", channel->Number(), channel->Name(), device->CardIndex(), cDevice::PrimaryDevice()->CardIndex(), cDevice::ActualDevice()->CardIndex());
device = NULL;
}
}
// make sure we don't come in here next time
channel = NULL;
switched.Signal();
}
mutex.Unlock();
}
cServerConnection::cServerConnection(const char *Protocol, int Type):
cTBSocket(Type),
m_Protocol(Protocol),
m_DeferClose(false),
m_Pending(false),
m_ReadBytes(0),
m_WriteBytes(0),
m_WriteIndex(0)
{
m_SwitchLive = new cSwitchLive();
}
cServerConnection::~cServerConnection()
{
delete m_SwitchLive;
}
const cChannel* cServerConnection::ChannelFromString(const char *String, int *Apid, int *Dpid) {
const cChannel *channel = NULL;
char *string = strdup(String);
char *ptr, *end;
int apididx = 0;
if ((ptr = strrchr(string, '+')) != NULL) {
*(ptr++) = '\0';
apididx = strtoul(ptr, &end, 10);
Dprintf("found apididx: %d\n", apididx);
}
if (isnumber(string)) {
int temp = strtol(String, NULL, 10);
if (temp >= 1 && temp <= Channels.MaxNumber())
channel = Channels.GetByNumber(temp);
} else {
channel = Channels.GetByChannelID(tChannelID::FromString(string));
if (channel == NULL) {
int i = 1;
while ((channel = Channels.GetByNumber(i, 1)) != NULL) {
if (String == channel->Name())
break;
i = channel->Number() + 1;
}
}
}
if (channel != NULL && apididx > 0) {
int apid = 0, dpid = 0;
int index = 1;
for (int i = 0; channel->Apid(i) != 0; ++i, ++index) {
if (index == apididx) {
apid = channel->Apid(i);
break;
}
}
if (apid == 0) {
for (int i = 0; channel->Dpid(i) != 0; ++i, ++index) {
if (index == apididx) {
dpid = channel->Dpid(i);
break;
}
}
}
if (Apid != NULL)
*Apid = apid;
if (Dpid != NULL)
*Dpid = dpid;
}
free(string);
return channel;
}
bool cServerConnection::Read(void)
{
int b;
if ((b = cTBSocket::Read(m_ReadBuffer + m_ReadBytes,
sizeof(m_ReadBuffer) - m_ReadBytes - 1)) < 0) {
esyslog("ERROR: read from client (%s) %s:%d failed: %m",
m_Protocol, RemoteIp().c_str(), RemotePort());
return false;
}
if (b == 0) {
isyslog("client (%s) %s:%d has closed connection",
m_Protocol, RemoteIp().c_str(), RemotePort());
return false;
}
m_ReadBytes += b;
m_ReadBuffer[m_ReadBytes] = '\0';
char *end;
bool result = true;
while ((end = strchr(m_ReadBuffer, '\012')) != NULL) {
*end = '\0';
if (end > m_ReadBuffer && *(end - 1) == '\015')
*(end - 1) = '\0';
if (!Command(m_ReadBuffer))
return false;
m_ReadBytes -= ++end - m_ReadBuffer;
if (m_ReadBytes > 0)
memmove(m_ReadBuffer, end, m_ReadBytes);
}
if (m_ReadBytes == sizeof(m_ReadBuffer) - 1) {
esyslog("ERROR: streamdev: input buffer overflow (%s) for %s:%d",
m_Protocol, RemoteIp().c_str(), RemotePort());
return false;
}
return result;
}
bool cServerConnection::Write(void)
{
int b;
if ((b = cTBSocket::Write(m_WriteBuffer + m_WriteIndex,
m_WriteBytes - m_WriteIndex)) < 0) {
esyslog("ERROR: streamdev: write to client (%s) %s:%d failed: %m",
m_Protocol, RemoteIp().c_str(), RemotePort());
return false;
}
m_WriteIndex += b;
if (m_WriteIndex == m_WriteBytes) {
m_WriteIndex = 0;
m_WriteBytes = 0;
if (m_Pending)
Command(NULL);
if (m_DeferClose)
return false;
Flushed();
}
return true;
}
bool cServerConnection::Respond(const char *Message, bool Last, ...)
{
char *buffer;
int length;
va_list ap;
va_start(ap, Last);
length = vasprintf(&buffer, Message, ap);
va_end(ap);
if (length < 0) {
esyslog("ERROR: streamdev: buffer allocation failed (%s) for %s:%d",
m_Protocol, RemoteIp().c_str(), RemotePort());
return false;
}
if (m_WriteBytes + length + 2 > sizeof(m_WriteBuffer)) {
esyslog("ERROR: streamdev: output buffer overflow (%s) for %s:%d",
m_Protocol, RemoteIp().c_str(), RemotePort());
free(buffer);
return false;
}
Dprintf("OUT: |%s|\n", buffer);
memcpy(m_WriteBuffer + m_WriteBytes, buffer, length);
free(buffer);
m_WriteBytes += length;
m_WriteBuffer[m_WriteBytes++] = '\015';
m_WriteBuffer[m_WriteBytes++] = '\012';
m_Pending = !Last;
return true;
}
#if APIVERSNUM >= 10700
static int GetClippedNumProvidedSystems(int AvailableBits, cDevice *Device)
{
int MaxNumProvidedSystems = (1 << AvailableBits) - 1;
int NumProvidedSystems = Device->NumProvidedSystems();
if (NumProvidedSystems > MaxNumProvidedSystems) {
esyslog("ERROR: device %d supports %d modulation systems but cDevice::GetDevice() currently only supports %d delivery systems which should be fixed", Device->CardIndex() + 1, NumProvidedSystems, MaxNumProvidedSystems);
NumProvidedSystems = MaxNumProvidedSystems;
}
else if (NumProvidedSystems <= 0) {
esyslog("ERROR: device %d reported an invalid number (%d) of supported delivery systems - assuming 1", Device->CardIndex() + 1, NumProvidedSystems);
NumProvidedSystems = 1;
}
return NumProvidedSystems;
}
#endif
/*
* copy of cDevice::GetDevice(...) but without side effects (not detaching receivers)
*/
cDevice* cServerConnection::CheckDevice(const cChannel *Channel, int Priority, bool LiveView, const cDevice *AvoidDevice)
{
//cDevice *AvoidDevice = avoidDevice;
//avoidDevice = NULL;
// Collect the current priorities of all CAM slots that can decrypt the channel:
int NumCamSlots = CamSlots.Count();
int SlotPriority[NumCamSlots];
int NumUsableSlots = 0;
if (Channel->Ca() >= CA_ENCRYPTED_MIN) {
for (cCamSlot *CamSlot = CamSlots.First(); CamSlot; CamSlot = CamSlots.Next(CamSlot)) {
SlotPriority[CamSlot->Index()] = MAXPRIORITY + 1; // assumes it can't be used
if (CamSlot->ModuleStatus() == msReady) {
if (CamSlot->ProvidesCa(Channel->Caids())) {
if (!ChannelCamRelations.CamChecked(Channel->GetChannelID(), CamSlot->SlotNumber())) {
SlotPriority[CamSlot->Index()] = CamSlot->Priority();
NumUsableSlots++;
}
}
}
}
if (!NumUsableSlots)
return NULL; // no CAM is able to decrypt this channel
}
bool NeedsDetachReceivers = false;
cDevice *d = NULL;
//cCamSlot *s = NULL;
uint32_t Impact = 0xFFFFFFFF; // we're looking for a device with the least impact
for (int j = 0; j < NumCamSlots || !NumUsableSlots; j++) {
if (NumUsableSlots && SlotPriority[j] > MAXPRIORITY)
continue; // there is no CAM available in this slot
for (int i = 0; i < cDevice::NumDevices(); i++) {
cDevice *device = cDevice::GetDevice(i);
if (device == AvoidDevice)
continue; // we've been asked to skip this device
if (Channel->Ca() && Channel->Ca() <= CA_DVB_MAX && Channel->Ca() != device->CardIndex() + 1)
continue; // a specific card was requested, but not this one
if (NumUsableSlots && !CamSlots.Get(j)->Assign(device, true))
continue; // CAM slot can't be used with this device
bool ndr;
if (device->ProvidesChannel(Channel, Priority, &ndr)) { // this device is basicly able to do the job
if (NumUsableSlots && device->CamSlot() && device->CamSlot() != CamSlots.Get(j))
ndr = true; // using a different CAM slot requires detaching receivers
// Put together an integer number that reflects the "impact" using
// this device would have on the overall system. Each condition is represented
// by one bit in the number (or several bits, if the condition is actually
// a numeric value). The sequence in which the conditions are listed corresponds
// to their individual severity, where the one listed first will make the most
// difference, because it results in the most significant bit of the result.
uint32_t imp = 0;
imp <<= 1; imp |= LiveView ? !device->IsPrimaryDevice() || ndr : 0; // prefer the primary device for live viewing if we don't need to detach existing receivers
imp <<= 1; imp |= !device->Receiving() && (device != cTransferControl::ReceiverDevice() || device->IsPrimaryDevice()) || ndr; // use receiving devices if we don't need to detach existing receivers, but avoid primary device in local transfer mode
imp <<= 1; imp |= device->Receiving(); // avoid devices that are receiving
#if APIVERSNUM >= 10700
imp <<= 4; imp |= GetClippedNumProvidedSystems(4, device) - 1; // avoid cards which support multiple delivery systems
#endif
imp <<= 1; imp |= device == cTransferControl::ReceiverDevice(); // avoid the Transfer Mode receiver device
imp <<= 8; imp |= min(max(device->Priority() + MAXPRIORITY, 0), 0xFF); // use the device with the lowest priority (+MAXPRIORITY to assure that values -99..99 can be used)
imp <<= 8; imp |= min(max((NumUsableSlots ? SlotPriority[j] : 0) + MAXPRIORITY, 0), 0xFF); // use the CAM slot with the lowest priority (+MAXPRIORITY to assure that values -99..99 can be used)
imp <<= 1; imp |= ndr; // avoid devices if we need to detach existing receivers
imp <<= 1; imp |= device->IsPrimaryDevice(); // avoid the primary device
imp <<= 1; imp |= NumUsableSlots ? 0 : device->HasCi(); // avoid cards with Common Interface for FTA channels
imp <<= 1; imp |= device->HasDecoder(); // avoid full featured cards
imp <<= 1; imp |= NumUsableSlots ? !ChannelCamRelations.CamDecrypt(Channel->GetChannelID(), j + 1) : 0; // prefer CAMs that are known to decrypt this channel
if (imp < Impact) {
// This device has less impact than any previous one, so we take it.
Impact = imp;
d = device;
NeedsDetachReceivers = ndr;
}
}
}
if (!NumUsableSlots)
break; // no CAM necessary, so just one loop over the devices
}
return d;
}
bool cServerConnection::UsedByLiveTV(cDevice *device)
{
return device == cTransferControl::ReceiverDevice() ||
(device->IsPrimaryDevice() && device->HasDecoder() && !device->Replaying());
}
cDevice *cServerConnection::GetDevice(const cChannel *Channel, int Priority)
{
// turn off the streams of this connection
Detach();
// This call may detach receivers of the device it returns
cDevice *device = cDevice::GetDevice(Channel, Priority, false);
if (device && !device->IsTunedToTransponder(Channel)
&& UsedByLiveTV(device)) {
// now we would have to switch away live tv...let's see if live tv
// can be handled by another device
device = m_SwitchLive->Switch(device, Channel);
}
if (!device) {
// can't switch - continue the current stream
Attach();
dsyslog("streamdev: GetDevice failed for channel %d (%s) at priority %d (PrimaryDevice=%d, ActualDevice=%d)", Channel->Number(), Channel->Name(), Priority, cDevice::PrimaryDevice()->CardIndex(), cDevice::ActualDevice()->CardIndex());
}
return device;
}
bool cServerConnection::ProvidesChannel(const cChannel *Channel, int Priority)
{
cDevice *device = CheckDevice(Channel, Priority, false);
if (!device || (StreamdevServerSetup.SuspendMode != smAlways
&& !device->IsTunedToTransponder(Channel)
&& UsedByLiveTV(device))) {
// no device available or the device is in use for live TV and suspend mode doesn't allow us to switch it:
// maybe a device would be free if THIS connection did turn off its streams?
Detach();
device = CheckDevice(Channel, Priority, false);
Attach();
if (device && StreamdevServerSetup.SuspendMode != smAlways
&& !device->IsTunedToTransponder(Channel)
&& UsedByLiveTV(device)) {
// now we would have to switch away live tv...let's see if live tv
// can be handled by another device
const cChannel *current = Channels.GetByNumber(cDevice::CurrentChannel());
cDevice *newdev = current ? CheckDevice(current, 0, true, device) : NULL;
if (newdev) {
dsyslog("streamdev: Providing channel %d (%s) at priority %d requires moving live TV to device %d (PrimaryDevice=%d, ActualDevice=%d)", Channel->Number(), Channel->Name(), Priority, newdev->CardIndex(), cDevice::PrimaryDevice()->CardIndex(), cDevice::ActualDevice()->CardIndex());
}
else {
device = NULL;
dsyslog("streamdev: Not providing channel %d (%s) at priority %d - live TV not suspended", Channel->Number(), Channel->Name(), Priority);
}
}
else if (!device)
dsyslog("streamdev: No device provides channel %d (%s) at priority %d", Channel->Number(), Channel->Name(), Priority);
}
return device;
}
void cServerConnection::MainThreadHook()
{
m_SwitchLive->Switch();
}
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