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/*
* recorder.c: The actual DVB recorder
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: recorder.c 2.12 2011/08/07 13:36:05 kls Exp $
*/
#include "recorder.h"
#include "shutdown.h"
#define RECORDERBUFSIZE (MEGABYTE(5) / TS_SIZE * TS_SIZE) // multiple of TS_SIZE
// The maximum time we wait before assuming that a recorded video data stream
// is broken:
#define MAXBROKENTIMEOUT 30 // seconds
#define MINFREEDISKSPACE (512) // MB
#define DISKCHECKINTERVAL 100 // seconds
// --- cRecorder -------------------------------------------------------------
cRecorder::cRecorder(const char *FileName, const cChannel *Channel, int Priority)
:cReceiver(Channel, Priority)
,cThread("recording")
{
recordingName = strdup(FileName);
// Make sure the disk is up and running:
SpinUpDisk(FileName);
ringBuffer = new cRingBufferLinear(RECORDERBUFSIZE, TS_SIZE, true, "Recorder");
ringBuffer->SetTimeouts(0, 100);
int Pid = Channel->Vpid();
int Type = Channel->Vtype();
if (!Pid && Channel->Apid(0)) {
Pid = Channel->Apid(0);
Type = 0x04;
}
if (!Pid && Channel->Dpid(0)) {
Pid = Channel->Dpid(0);
Type = 0x06;
}
frameDetector = new cFrameDetector(Pid, Type);
index = NULL;
fileSize = 0;
lastDiskSpaceCheck = time(NULL);
fileName = new cFileName(FileName, true);
int PatVersion, PmtVersion;
if (fileName->GetLastPatPmtVersions(PatVersion, PmtVersion))
patPmtGenerator.SetVersions(PatVersion + 1, PmtVersion + 1);
patPmtGenerator.SetChannel(Channel);
recordFile = fileName->Open();
if (!recordFile)
return;
// Create the index file:
index = new cIndexFile(FileName, true);
if (!index)
esyslog("ERROR: can't allocate index");
// let's continue without index, so we'll at least have the recording
}
cRecorder::~cRecorder()
{
Detach();
delete index;
delete fileName;
delete frameDetector;
delete ringBuffer;
free(recordingName);
}
bool cRecorder::RunningLowOnDiskSpace(void)
{
if (time(NULL) > lastDiskSpaceCheck + DISKCHECKINTERVAL) {
int Free = FreeDiskSpaceMB(fileName->Name());
lastDiskSpaceCheck = time(NULL);
if (Free < MINFREEDISKSPACE) {
dsyslog("low disk space (%d MB, limit is %d MB)", Free, MINFREEDISKSPACE);
return true;
}
}
return false;
}
bool cRecorder::NextFile(void)
{
if (recordFile) {
if (fileSize > MEGABYTE(off_t(Setup.MaxVideoFileSize)) || RunningLowOnDiskSpace()) {
recordFile = fileName->NextFile();
fileSize = 0;
}
}
return recordFile != NULL;
}
void cRecorder::Activate(bool On)
{
if (On)
Start();
else
Cancel(3);
}
void cRecorder::Receive(uchar *Data, int Length)
{
if (Running()) {
int p = ringBuffer->Put(Data, Length);
if (p != Length && Running())
ringBuffer->ReportOverflow(Length - p);
}
}
void cRecorder::Action(void)
{
time_t t = time(NULL);
bool InfoWritten = false;
bool FirstIframeSeen = false;
#define BUFFERSIZE MEGABYTE(1)
bool Buffering = false;
int BufferIndex = 0;
int MaxBufferIndex = 0;
uchar *Buffer = NULL;
while (Running()) {
int r;
uchar *b = ringBuffer->Get(r);
if (b) {
int Count = frameDetector->Analyze(b, r);
if (Count) {
if (!Running() && frameDetector->IndependentFrame()) // finish the recording before the next independent frame
break;
if (frameDetector->Synced()) {
if (!InfoWritten) {
cRecordingInfo RecordingInfo(recordingName);
if (RecordingInfo.Read()) {
if (frameDetector->FramesPerSecond() > 0 && DoubleEqual(RecordingInfo.FramesPerSecond(), DEFAULTFRAMESPERSECOND) && !DoubleEqual(RecordingInfo.FramesPerSecond(), frameDetector->FramesPerSecond())) {
RecordingInfo.SetFramesPerSecond(frameDetector->FramesPerSecond());
RecordingInfo.Write();
Recordings.UpdateByName(recordingName);
}
}
InfoWritten = true;
}
if (frameDetector->NewPayload()) { // We're at the first TS packet of a new payload...
if (Buffering)
esyslog("ERROR: encountered new payload while buffering - dropping some data!");
if (!frameDetector->NewFrame()) { // ...but the frame type is yet unknown, so we need to buffer packets until we see the frame type
if (!Buffer) {
dsyslog("frame type not in first packet of payload - buffering");
if (!(Buffer = MALLOC(uchar, BUFFERSIZE))) {
esyslog("ERROR: can't allocate frame type buffer");
break;
}
}
BufferIndex = 0;
Buffering = true;
}
}
else if (frameDetector->NewFrame()) // now we know the frame type, so stop buffering
Buffering = false;
if (Buffering) {
if (BufferIndex + Count <= BUFFERSIZE) {
memcpy(Buffer + BufferIndex, b, Count);
BufferIndex += Count;
}
else
esyslog("ERROR: too many bytes for frame type buffer (%d > %d) - dropped %d bytes", BufferIndex + Count, int(BUFFERSIZE), Count);
}
else if (FirstIframeSeen || frameDetector->IndependentFrame()) {
FirstIframeSeen = true; // start recording with the first I-frame
if (frameDetector->IndependentFrame() && !NextFile()) // every file shall start with an independent frame
break;
if (index && frameDetector->NewFrame())
index->Write(frameDetector->IndependentFrame(), fileName->Number(), fileSize);
if (frameDetector->IndependentFrame()) {
recordFile->Write(patPmtGenerator.GetPat(), TS_SIZE);
fileSize += TS_SIZE;
int Index = 0;
while (uchar *pmt = patPmtGenerator.GetPmt(Index)) {
recordFile->Write(pmt, TS_SIZE);
fileSize += TS_SIZE;
}
}
if (BufferIndex) {
recordFile->Write(Buffer, BufferIndex); // if an error occurs here, the next write below will catch and report it
if (BufferIndex > MaxBufferIndex)
MaxBufferIndex = BufferIndex;
BufferIndex = 0;
}
if (recordFile->Write(b, Count) < 0) {
LOG_ERROR_STR(fileName->Name());
break;
}
fileSize += Count;
t = time(NULL);
}
}
ringBuffer->Del(Count);
}
}
if (time(NULL) - t > MAXBROKENTIMEOUT) {
esyslog("ERROR: video data stream broken");
ShutdownHandler.RequestEmergencyExit();
t = time(NULL);
}
}
if (Buffer) {
free(Buffer);
dsyslog("frame type buffer used %d bytes", MaxBufferIndex);
}
}
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