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vdr/recorder.c

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C
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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 5.4 2021/06/19 14:21:16 kls Exp $
*/
#include "recorder.h"
#include "shutdown.h"
#define RECORDERBUFSIZE (MEGABYTE(20) / 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 30000 // milliseconds
#define MINFREEDISKSPACE (512) // MB
#define DISKCHECKINTERVAL 100 // seconds
static bool DebugChecks = false;
// cTsChecker and cFrameChecker are used to detect errors in the recorded data stream.
// While cTsChecker checks the continuity counter of the incoming TS packets, cFrameChecker
// works on entire frames, checking their PTS (Presentation Time Stamps) to see whether
// all expected frames arrive. The resulting number of errors is not a precise value.
// If it is zero, the recording can be safely considered error free. The higher the value,
// the more damaged the recording is.
// --- cTsChecker ------------------------------------------------------------
#define TS_CC_UNKNOWN 0xFF
class cTsChecker {
private:
uchar counter[MAXPID];
int errors;
void Report(int Pid, const char *Message);
public:
cTsChecker(void);
void CheckTs(const uchar *Data, int Length);
int Errors(void) { return errors; }
};
cTsChecker::cTsChecker(void)
{
memset(counter, TS_CC_UNKNOWN, sizeof(counter));
errors = 0;
}
void cTsChecker::Report(int Pid, const char *Message)
{
errors++;
if (DebugChecks)
fprintf(stderr, "%s: TS error #%d on PID %d (%s)\n", *TimeToString(time(NULL)), errors, Pid, Message);
}
void cTsChecker::CheckTs(const uchar *Data, int Length)
{
int Pid = TsPid(Data);
uchar Cc = TsContinuityCounter(Data);
if (TsHasPayload(Data)) {
if (TsError(Data))
Report(Pid, "tei");
else if (TsIsScrambled(Data))
Report(Pid, "scrambled");
else {
uchar OldCc = counter[Pid];
if (OldCc != TS_CC_UNKNOWN) {
uchar NewCc = (OldCc + 1) & TS_CONT_CNT_MASK;
if (Cc != NewCc)
Report(Pid, "continuity");
}
}
}
counter[Pid] = Cc;
}
// --- cFrameChecker ---------------------------------------------------------
#define MAX_BACK_REFS 32
class cFrameChecker {
private:
int frameDelta;
int64_t lastPts;
uint32_t backRefs;
int lastFwdRef;
int errors;
void Report(const char *Message, int NumErrors = 1);
public:
cFrameChecker(void);
void SetFrameDelta(int FrameDelta) { frameDelta = FrameDelta; }
void CheckFrame(const uchar *Data, int Length);
void ReportBroken(void);
int Errors(void) { return errors; }
};
cFrameChecker::cFrameChecker(void)
{
frameDelta = PTSTICKS / DEFAULTFRAMESPERSECOND;
lastPts = -1;
backRefs = 0;
lastFwdRef = 0;
errors = 0;
}
void cFrameChecker::Report(const char *Message, int NumErrors)
{
errors += NumErrors;
if (DebugChecks)
fprintf(stderr, "%s: frame error #%d (%s)\n", *TimeToString(time(NULL)), errors, Message);
}
void cFrameChecker::CheckFrame(const uchar *Data, int Length)
{
int64_t Pts = TsGetPts(Data, Length);
if (Pts >= 0) {
if (lastPts >= 0) {
int Diff = int(round((PtsDiff(lastPts, Pts) / double(frameDelta))));
if (Diff > 0) {
if (Diff <= MAX_BACK_REFS) {
if (lastFwdRef > 1) {
if (backRefs != uint32_t((1 << (lastFwdRef - 1)) - 1))
Report("missing backref");
}
}
else
Report("missed", Diff);
backRefs = 0;
lastFwdRef = Diff;
lastPts = Pts;
}
else if (Diff < 0) {
Diff = -Diff;
if (Diff <= MAX_BACK_REFS) {
int b = 1 << (Diff - 1);
if ((backRefs & b) != 0)
Report("duplicate backref");
backRefs |= b;
}
else
Report("rev diff too big");
}
else
Report("zero diff");
}
else
lastPts = Pts;
}
else
Report("no PTS");
}
void cFrameChecker::ReportBroken(void)
{
int MissedFrames = MAXBROKENTIMEOUT / 1000 * PTSTICKS / frameDelta;
Report("missed", MissedFrames);
}
// --- cRecorder -------------------------------------------------------------
cRecorder::cRecorder(const char *FileName, const cChannel *Channel, int Priority)
:cReceiver(Channel, Priority)
,cThread("recording")
{
tsChecker = new cTsChecker;
frameChecker = new cFrameChecker;
recordingName = strdup(FileName);
recordingInfo = new cRecordingInfo(recordingName);
recordingInfo->Read();
oldErrors = max(0, recordingInfo->Errors()); // in case this is a re-started recording
errors = oldErrors;
lastErrors = errors;
firstIframeSeen = false;
// Make sure the disk is up and running:
SpinUpDisk(FileName);
ringBuffer = new cRingBufferLinear(RECORDERBUFSIZE, MIN_TS_PACKETS_FOR_FRAME_DETECTOR * TS_SIZE, true, "Recorder");
ringBuffer->SetTimeouts(0, 100);
ringBuffer->SetIoThrottle();
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);
lastErrorLog = 0;
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;
delete frameChecker;
delete tsChecker;
free(recordingName);
}
#define ERROR_LOG_DELTA 1 // seconds between logging errors
void cRecorder::HandleErrors(bool Force)
{
// We don't log every single error separately, to avoid spamming the log file:
if (Force || time(NULL) - lastErrorLog >= ERROR_LOG_DELTA) {
errors = tsChecker->Errors() + frameChecker->Errors();
if (errors > lastErrors) {
int d = errors - lastErrors;
if (DebugChecks)
fprintf(stderr, "%s: %s: %d error%s\n", *TimeToString(time(NULL)), recordingName, d, d > 1 ? "s" : "");
esyslog("%s: %d error%s", recordingName, d, d > 1 ? "s" : "");
recordingInfo->SetErrors(oldErrors + errors);
recordingInfo->Write();
LOCK_RECORDINGS_WRITE;
Recordings->UpdateByName(recordingName);
}
lastErrors = errors;
lastErrorLog = time(NULL);
}
}
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 && frameDetector->IndependentFrame()) { // every file shall start with an independent frame
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(const uchar *Data, int Length)
{
if (Running()) {
static const uchar aff[TS_SIZE - 4] = { 0xB7, 0x00,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF}; // Length is always TS_SIZE!
if ((Data[3] & 0b00110000) == 0b00100000 && !memcmp(Data + 4, aff, sizeof(aff)))
return; // Adaptation Field Filler found, skipping
int p = ringBuffer->Put(Data, Length);
if (p != Length && Running())
ringBuffer->ReportOverflow(Length - p);
else if (firstIframeSeen) // we ignore any garbage before the first I-frame
tsChecker->CheckTs(Data, Length);
}
}
void cRecorder::Action(void)
{
cTimeMs t(MAXBROKENTIMEOUT);
bool InfoWritten = false;
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) {
if (frameDetector->FramesPerSecond() > 0 && DoubleEqual(recordingInfo->FramesPerSecond(), DEFAULTFRAMESPERSECOND) && !DoubleEqual(recordingInfo->FramesPerSecond(), frameDetector->FramesPerSecond())) {
recordingInfo->SetFramesPerSecond(frameDetector->FramesPerSecond());
recordingInfo->Write();
LOCK_RECORDINGS_WRITE;
Recordings->UpdateByName(recordingName);
}
InfoWritten = true;
cRecordingUserCommand::InvokeCommand(RUC_STARTRECORDING, recordingName);
frameChecker->SetFrameDelta(PTSTICKS / frameDetector->FramesPerSecond());
}
if (firstIframeSeen || frameDetector->IndependentFrame()) {
firstIframeSeen = true; // start recording with the first I-frame
if (!NextFile())
break;
if (frameDetector->NewFrame()) {
if (index)
index->Write(frameDetector->IndependentFrame(), fileName->Number(), fileSize);
if (frameChecker)
frameChecker->CheckFrame(b, Count);
}
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;
}
t.Set(MAXBROKENTIMEOUT);
}
if (recordFile->Write(b, Count) < 0) {
LOG_ERROR_STR(fileName->Name());
break;
}
HandleErrors();
fileSize += Count;
}
}
ringBuffer->Del(Count);
}
}
if (t.TimedOut()) {
frameChecker->ReportBroken();
HandleErrors(true);
esyslog("ERROR: video data stream broken");
ShutdownHandler.RequestEmergencyExit();
t.Set(MAXBROKENTIMEOUT);
}
}
HandleErrors(true);
}
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