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vdr/dvbplayer.c
Klaus Schmidinger a3942b4d17 Version 1.1.22 
- Added 'Hrvatska radiotelevizija' and 'RTV Slovenija' to ca.conf (thanks to
  Paul Gohn).
- Implemented actual user input for CAM enquiry menus.
- Since disk file systems apparently don't honor the O_NONBLOCK flag to read from
  a file in non-blocking mode the cDvbPlayer now uses a non blocking file reader
  class to make sure replay remains smooth even under heavy system load.
- Increased the maximum possible packet size in remux.c to avoid corrupted streams
  with broadcasters that send extremely large PES packets (thanks to Teemu Rantanen).
- Added TS error checking to remux.c (thanks to Teemu Rantanen).
- Modified cRingBufferLinear to avoid excessive memmove() calls in 'Transfer Mode'
  and during recordings, which dramatically reduces CPU load. Thanks to Teemu
  Rantanen for pinpointing the problem with the excessive memmove() calls.
- Updated 'channels.conf' (thanks to Achim Lange).
- Added/improved Swedish language texts (thanks to Jan Ekholm).
- Fixed the description of the "Scroll pages" OSD setup parameter ('yes' and 'no'
  were mixed up).
- Fixed handling the LOG_LOCALn parameters in the -l option (thanks to Dimitrios
  Dimitrakos).
- Changed EIT processing to always read a full section.
- Fixed handling user defined CFLAGS in libdtv/libvdr/Makefile (thanks to Clemens
  Kirchgatterer and Robert Schiele).
- Fixed skipping unavailable channels in the EPG scanner.
2003-01-26 18:00:00 +01:00

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/*
* dvbplayer.c: The DVB player
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: dvbplayer.c 1.17 2003/01/19 15:43:58 kls Exp $
*/
#include "dvbplayer.h"
#include <stdlib.h>
#include "recording.h"
#include "ringbuffer.h"
#include "thread.h"
#include "tools.h"
// --- cBackTrace ----------------------------------------------------------
#define AVG_FRAME_SIZE 15000 // an assumption about the average frame size
#define DVB_BUF_SIZE (256 * 1024) // an assumption about the dvb firmware buffer size
#define BACKTRACE_ENTRIES (DVB_BUF_SIZE / AVG_FRAME_SIZE + 20) // how many entries are needed to backtrace buffer contents
class cBackTrace {
private:
int index[BACKTRACE_ENTRIES];
int length[BACKTRACE_ENTRIES];
int pos, num;
public:
cBackTrace(void);
void Clear(void);
void Add(int Index, int Length);
int Get(bool Forward);
};
cBackTrace::cBackTrace(void)
{
Clear();
}
void cBackTrace::Clear(void)
{
pos = num = 0;
}
void cBackTrace::Add(int Index, int Length)
{
index[pos] = Index;
length[pos] = Length;
if (++pos >= BACKTRACE_ENTRIES)
pos = 0;
if (num < BACKTRACE_ENTRIES)
num++;
}
int cBackTrace::Get(bool Forward)
{
int p = pos;
int n = num;
int l = DVB_BUF_SIZE + (Forward ? 0 : 256 * 1024); //XXX (256 * 1024) == DVB_BUF_SIZE ???
int i = -1;
while (n && l > 0) {
if (--p < 0)
p = BACKTRACE_ENTRIES - 1;
i = index[p] - 1;
l -= length[p];
n--;
}
return i;
}
// --- cNonBlockingFileReader ------------------------------------------------
class cNonBlockingFileReader : public cThread {
private:
int f;
uchar *buffer;
int wanted;
int length;
bool hasData;
bool active;
cMutex mutex;
cCondVar newSet;
protected:
void Action(void);
public:
cNonBlockingFileReader(void);
~cNonBlockingFileReader();
void Clear(void);
int Read(int FileHandle, uchar *Buffer, int Length);
bool Reading(void) { return buffer; }
};
cNonBlockingFileReader::cNonBlockingFileReader(void)
{
f = -1;
buffer = NULL;
wanted = length = 0;
hasData = false;
active = false;
Start();
}
cNonBlockingFileReader::~cNonBlockingFileReader()
{
active = false;
newSet.Broadcast();
Cancel(3);
free(buffer);
}
void cNonBlockingFileReader::Clear(void)
{
cMutexLock MutexLock(&mutex);
f = -1;
buffer = NULL;
wanted = length = 0;
hasData = false;
newSet.Broadcast();
}
int cNonBlockingFileReader::Read(int FileHandle, uchar *Buffer, int Length)
{
if (hasData && buffer) {
if (buffer != Buffer) {
esyslog("ERROR: cNonBlockingFileReader::Read() called with different buffer!");
errno = EINVAL;
return -1;
}
buffer = NULL;
return length;
}
if (!buffer) {
f = FileHandle;
buffer = Buffer;
wanted = Length;
length = 0;
hasData = false;
newSet.Broadcast();
}
errno = EAGAIN;
return -1;
}
void cNonBlockingFileReader::Action(void)
{
dsyslog("non blocking file reader thread started (pid=%d)", getpid());
active = true;
while (active) {
cMutexLock MutexLock(&mutex);
if (!hasData && f >= 0 && buffer) {
int r = safe_read(f, buffer + length, wanted - length);
if (r >= 0) {
length += r;
if (!r || length == wanted) // r == 0 means EOF
hasData = true;
}
else if (r < 0 && FATALERRNO) {
LOG_ERROR;
length = r; // this will forward the error status to the caller
hasData = true;
}
}
newSet.TimedWait(mutex, 1000);
}
dsyslog("non blocking file reader thread ended (pid=%d)", getpid());
}
// --- cDvbPlayer ------------------------------------------------------------
//XXX+ also used in recorder.c - find a better place???
// The size of the array used to buffer video data:
// (must be larger than MINVIDEODATA - see remux.h)
#define VIDEOBUFSIZE MEGABYTE(1)
// The number of frames to back up when resuming an interrupted replay session:
#define RESUMEBACKUP (10 * FRAMESPERSEC)
class cDvbPlayer : public cPlayer, cThread {
private:
enum ePlayModes { pmPlay, pmPause, pmSlow, pmFast, pmStill };
enum ePlayDirs { pdForward, pdBackward };
static int Speeds[];
cNonBlockingFileReader *nonBlockingFileReader;
cRingBufferFrame *ringBuffer;
cBackTrace *backTrace;
cFileName *fileName;
cIndexFile *index;
int replayFile;
bool eof;
bool active;
bool running;
ePlayModes playMode;
ePlayDirs playDir;
int trickSpeed;
int readIndex, writeIndex;
bool canToggleAudioTrack;
uchar audioTrack;
cFrame *readFrame;
const cFrame *playFrame;
void TrickSpeed(int Increment);
void Empty(void);
void StripAudioPackets(uchar *b, int Length, uchar Except = 0x00);
bool NextFile(uchar FileNumber = 0, int FileOffset = -1);
int Resume(void);
bool Save(void);
protected:
virtual void Activate(bool On);
virtual void Action(void);
public:
cDvbPlayer(const char *FileName);
virtual ~cDvbPlayer();
bool Active(void) { return active; }
void Pause(void);
void Play(void);
void Forward(void);
void Backward(void);
int SkipFrames(int Frames);
void SkipSeconds(int Seconds);
void Goto(int Position, bool Still = false);
virtual bool GetIndex(int &Current, int &Total, bool SnapToIFrame = false);
virtual bool GetReplayMode(bool &Play, bool &Forward, int &Speed);
virtual int NumAudioTracks(void) const;
virtual const char **GetAudioTracks(int *CurrentTrack = NULL) const;
virtual void SetAudioTrack(int Index);
};
#define MAX_VIDEO_SLOWMOTION 63 // max. arg to pass to VIDEO_SLOWMOTION // TODO is this value correct?
#define NORMAL_SPEED 4 // the index of the '1' entry in the following array
#define MAX_SPEEDS 3 // the offset of the maximum speed from normal speed in either direction
#define SPEED_MULT 12 // the speed multiplier
int cDvbPlayer::Speeds[] = { 0, -2, -4, -8, 1, 2, 4, 12, 0 };
cDvbPlayer::cDvbPlayer(const char *FileName)
{
nonBlockingFileReader = NULL;
ringBuffer = NULL;
backTrace = NULL;
index = NULL;
eof = false;
active = true;
running = false;
playMode = pmPlay;
playDir = pdForward;
trickSpeed = NORMAL_SPEED;
canToggleAudioTrack = false;
audioTrack = 0xC0;
readIndex = writeIndex = -1;
readFrame = NULL;
playFrame = NULL;
isyslog("replay %s", FileName);
fileName = new cFileName(FileName, false);
replayFile = fileName->Open();
if (replayFile < 0)
return;
ringBuffer = new cRingBufferFrame(VIDEOBUFSIZE);
// Create the index file:
index = new cIndexFile(FileName, false);
if (!index)
esyslog("ERROR: can't allocate index");
else if (!index->Ok()) {
delete index;
index = NULL;
}
backTrace = new cBackTrace;
}
cDvbPlayer::~cDvbPlayer()
{
Detach();
Save();
delete index;
delete fileName;
delete backTrace;
delete ringBuffer;
}
void cDvbPlayer::TrickSpeed(int Increment)
{
int nts = trickSpeed + Increment;
if (Speeds[nts] == 1) {
trickSpeed = nts;
if (playMode == pmFast)
Play();
else
Pause();
}
else if (Speeds[nts]) {
trickSpeed = nts;
int Mult = (playMode == pmSlow && playDir == pdForward) ? 1 : SPEED_MULT;
int sp = (Speeds[nts] > 0) ? Mult / Speeds[nts] : -Speeds[nts] * Mult;
if (sp > MAX_VIDEO_SLOWMOTION)
sp = MAX_VIDEO_SLOWMOTION;
DeviceTrickSpeed(sp);
}
}
void cDvbPlayer::Empty(void)
{
LOCK_THREAD;
if (nonBlockingFileReader)
nonBlockingFileReader->Clear();
if ((readIndex = backTrace->Get(playDir == pdForward)) < 0)
readIndex = writeIndex;
readFrame = NULL;
playFrame = NULL;
ringBuffer->Clear();
backTrace->Clear();
DeviceClear();
}
void cDvbPlayer::StripAudioPackets(uchar *b, int Length, uchar Except)
{
if (index) {
for (int i = 0; i < Length - 6; i++) {
if (b[i] == 0x00 && b[i + 1] == 0x00 && b[i + 2] == 0x01) {
uchar c = b[i + 3];
int l = b[i + 4] * 256 + b[i + 5] + 6;
switch (c) {
case 0xBD: // dolby
if (Except)
PlayAudio(&b[i], l);
// continue with deleting the data - otherwise it disturbs DVB replay
case 0xC0 ... 0xC1: // audio
if (c == 0xC1)
canToggleAudioTrack = true;
if (!Except || c != Except) {
int n = l;
for (int j = i; j < Length && n--; j++)
b[j] = 0x00;
}
break;
case 0xE0 ... 0xEF: // video
break;
default:
//esyslog("ERROR: unexpected packet id %02X", c);
l = 0;
}
if (l)
i += l - 1; // the loop increments, too!
}
/*XXX
else
esyslog("ERROR: broken packet header");
XXX*/
}
}
}
bool cDvbPlayer::NextFile(uchar FileNumber, int FileOffset)
{
if (FileNumber > 0)
replayFile = fileName->SetOffset(FileNumber, FileOffset);
else if (replayFile >= 0 && eof)
replayFile = fileName->NextFile();
eof = false;
return replayFile >= 0;
}
int cDvbPlayer::Resume(void)
{
if (index) {
int Index = index->GetResume();
if (Index >= 0) {
uchar FileNumber;
int FileOffset;
if (index->Get(Index, &FileNumber, &FileOffset) && NextFile(FileNumber, FileOffset))
return Index;
}
}
return -1;
}
bool cDvbPlayer::Save(void)
{
if (index) {
int Index = writeIndex;
if (Index >= 0) {
Index -= RESUMEBACKUP;
if (Index > 0)
Index = index->GetNextIFrame(Index, false);
else
Index = 0;
if (Index >= 0)
return index->StoreResume(Index);
}
}
return false;
}
void cDvbPlayer::Activate(bool On)
{
if (On) {
if (replayFile >= 0)
Start();
}
else if (active) {
running = false;
Cancel(3);
active = false;
}
}
void cDvbPlayer::Action(void)
{
dsyslog("dvbplayer thread started (pid=%d)", getpid());
uchar *b = NULL;
const uchar *p = NULL;
int pc = 0;
readIndex = Resume();
if (readIndex >= 0)
isyslog("resuming replay at index %d (%s)", readIndex, IndexToHMSF(readIndex, true));
nonBlockingFileReader = new cNonBlockingFileReader;
int Length = 0;
int AudioTrack = 0; // -1 = any, 0 = none, >0 = audioTrack
running = true;
while (running && (NextFile() || readIndex >= 0 || ringBuffer->Available())) {
cPoller Poller;
if (!readFrame)
Poller.Add(replayFile, false);
if (DevicePoll(Poller, 100)) {
LOCK_THREAD;
// Read the next frame from the file:
if (!readFrame && (replayFile >= 0 || readIndex >= 0)) {
if (playMode != pmStill) {
if (!nonBlockingFileReader->Reading()) {
if (playMode == pmFast || (playMode == pmSlow && playDir == pdBackward)) {
uchar FileNumber;
int FileOffset;
int Index = index->GetNextIFrame(readIndex, playDir == pdForward, &FileNumber, &FileOffset, &Length, true);
if (Index >= 0) {
if (!NextFile(FileNumber, FileOffset))
continue;
}
else {
// can't call Play() here, because those functions may only be
// called from the foreground thread - and we also don't need
// to empty the buffer here
DevicePlay();
playMode = pmPlay;
playDir = pdForward;
continue;
}
readIndex = Index;
AudioTrack = 0;
// must clear all audio packets because the buffer is not emptied
// when falling back from "fast forward" to "play" (see above)
}
else if (index) {
uchar FileNumber;
int FileOffset;
readIndex++;
if (!(index->Get(readIndex, &FileNumber, &FileOffset, NULL, &Length) && NextFile(FileNumber, FileOffset))) {
readIndex = -1;
eof = true;
continue;
}
AudioTrack = audioTrack;
}
else { // allows replay even if the index file is missing
Length = MAXFRAMESIZE;
AudioTrack = -1;
}
if (Length == -1)
Length = MAXFRAMESIZE; // this means we read up to EOF (see cIndex)
else if (Length > MAXFRAMESIZE) {
esyslog("ERROR: frame larger than buffer (%d > %d)", Length, MAXFRAMESIZE);
Length = MAXFRAMESIZE;
}
b = MALLOC(uchar, Length);
}
int r = nonBlockingFileReader->Read(replayFile, b, Length);
if (r > 0) {
if (AudioTrack >= 0)
StripAudioPackets(b, r, AudioTrack);
readFrame = new cFrame(b, -r, ftUnknown, readIndex); // hands over b to the ringBuffer
b = NULL;
}
else if (r == 0)
eof = true;
else if (r < 0 && FATALERRNO) {
LOG_ERROR;
break;
}
}
else//XXX
usleep(1); // this keeps the CPU load low
}
// Store the frame in the buffer:
if (readFrame) {
if (ringBuffer->Put(readFrame))
readFrame = NULL;
}
// Get the next frame from the buffer:
if (!playFrame) {
playFrame = ringBuffer->Get();
p = NULL;
pc = 0;
}
// Play the frame:
if (playFrame) {
if (!p) {
p = playFrame->Data();
pc = playFrame->Count();
}
if (p) {
int w = PlayVideo(p, pc);
if (w > 0) {
p += w;
pc -= w;
}
else if (w < 0 && FATALERRNO) {
LOG_ERROR;
break;
}
}
if (pc == 0) {
writeIndex = playFrame->Index();
backTrace->Add(playFrame->Index(), playFrame->Count());
ringBuffer->Drop(playFrame);
playFrame = NULL;
p = 0;
}
}
}
}
active = running = false;
cNonBlockingFileReader *nbfr = nonBlockingFileReader;
nonBlockingFileReader = NULL;
delete nbfr;
dsyslog("dvbplayer thread ended (pid=%d)", getpid());
}
void cDvbPlayer::Pause(void)
{
if (playMode == pmPause || playMode == pmStill)
Play();
else {
LOCK_THREAD;
if (playMode == pmFast || (playMode == pmSlow && playDir == pdBackward))
Empty();
DeviceFreeze();
playMode = pmPause;
}
}
void cDvbPlayer::Play(void)
{
if (playMode != pmPlay) {
LOCK_THREAD;
if (playMode == pmStill || playMode == pmFast || (playMode == pmSlow && playDir == pdBackward))
Empty();
DevicePlay();
playMode = pmPlay;
playDir = pdForward;
}
}
void cDvbPlayer::Forward(void)
{
if (index) {
switch (playMode) {
case pmFast:
if (Setup.MultiSpeedMode) {
TrickSpeed(playDir == pdForward ? 1 : -1);
break;
}
else if (playDir == pdForward) {
Play();
break;
}
// run into pmPlay
case pmPlay: {
LOCK_THREAD;
Empty();
DeviceMute();
playMode = pmFast;
playDir = pdForward;
trickSpeed = NORMAL_SPEED;
TrickSpeed(Setup.MultiSpeedMode ? 1 : MAX_SPEEDS);
}
break;
case pmSlow:
if (Setup.MultiSpeedMode) {
TrickSpeed(playDir == pdForward ? -1 : 1);
break;
}
else if (playDir == pdForward) {
Pause();
break;
}
// run into pmPause
case pmStill:
case pmPause:
DeviceMute();
playMode = pmSlow;
playDir = pdForward;
trickSpeed = NORMAL_SPEED;
TrickSpeed(Setup.MultiSpeedMode ? -1 : -MAX_SPEEDS);
break;
}
}
}
void cDvbPlayer::Backward(void)
{
if (index) {
switch (playMode) {
case pmFast:
if (Setup.MultiSpeedMode) {
TrickSpeed(playDir == pdBackward ? 1 : -1);
break;
}
else if (playDir == pdBackward) {
Play();
break;
}
// run into pmPlay
case pmPlay: {
LOCK_THREAD;
Empty();
DeviceMute();
playMode = pmFast;
playDir = pdBackward;
trickSpeed = NORMAL_SPEED;
TrickSpeed(Setup.MultiSpeedMode ? 1 : MAX_SPEEDS);
}
break;
case pmSlow:
if (Setup.MultiSpeedMode) {
TrickSpeed(playDir == pdBackward ? -1 : 1);
break;
}
else if (playDir == pdBackward) {
Pause();
break;
}
// run into pmPause
case pmStill:
case pmPause: {
LOCK_THREAD;
Empty();
DeviceMute();
playMode = pmSlow;
playDir = pdBackward;
trickSpeed = NORMAL_SPEED;
TrickSpeed(Setup.MultiSpeedMode ? -1 : -MAX_SPEEDS);
}
break;
}
}
}
int cDvbPlayer::SkipFrames(int Frames)
{
if (index && Frames) {
int Current, Total;
GetIndex(Current, Total, true);
int OldCurrent = Current;
Current = index->GetNextIFrame(Current + Frames, Frames > 0);
return Current >= 0 ? Current : OldCurrent;
}
return -1;
}
void cDvbPlayer::SkipSeconds(int Seconds)
{
if (index && Seconds) {
LOCK_THREAD;
Empty();
int Index = writeIndex;
if (Index >= 0) {
Index = max(Index + Seconds * FRAMESPERSEC, 0);
if (Index > 0)
Index = index->GetNextIFrame(Index, false, NULL, NULL, NULL, true);
if (Index >= 0)
readIndex = writeIndex = Index - 1; // Action() will first increment it!
}
Play();
}
}
void cDvbPlayer::Goto(int Index, bool Still)
{
if (index) {
LOCK_THREAD;
Empty();
if (++Index <= 0)
Index = 1; // not '0', to allow GetNextIFrame() below to work!
uchar FileNumber;
int FileOffset, Length;
Index = index->GetNextIFrame(Index, false, &FileNumber, &FileOffset, &Length);
if (Index >= 0 && NextFile(FileNumber, FileOffset) && Still) {
uchar b[MAXFRAMESIZE];
int r = ReadFrame(replayFile, b, Length, sizeof(b));
if (r > 0) {
if (playMode == pmPause)
DevicePlay();
StripAudioPackets(b, r);
DeviceStillPicture(b, r);
}
playMode = pmStill;
}
readIndex = writeIndex = Index;
}
}
bool cDvbPlayer::GetIndex(int &Current, int &Total, bool SnapToIFrame)
{
if (index) {
if (playMode == pmStill)
Current = max(readIndex, 0);
else {
Current = max(writeIndex, 0);
if (SnapToIFrame) {
int i1 = index->GetNextIFrame(Current + 1, false);
int i2 = index->GetNextIFrame(Current, true);
Current = (abs(Current - i1) <= abs(Current - i2)) ? i1 : i2;
}
}
Total = index->Last();
return true;
}
Current = Total = -1;
return false;
}
bool cDvbPlayer::GetReplayMode(bool &Play, bool &Forward, int &Speed)
{
Play = (playMode == pmPlay || playMode == pmFast);
Forward = (playDir == pdForward);
if (playMode == pmFast || playMode == pmSlow)
Speed = Setup.MultiSpeedMode ? abs(trickSpeed - NORMAL_SPEED) : 0;
else
Speed = -1;
return true;
}
int cDvbPlayer::NumAudioTracks(void) const
{
return canToggleAudioTrack ? 2 : 1;
}
const char **cDvbPlayer::GetAudioTracks(int *CurrentTrack) const
{
if (NumAudioTracks()) {
if (CurrentTrack)
*CurrentTrack = (audioTrack == 0xC0) ? 0 : 1;
static const char *audioTracks1[] = { "Audio 1", NULL };
static const char *audioTracks2[] = { "Audio 1", "Audio 2", NULL };
return NumAudioTracks() > 1 ? audioTracks2 : audioTracks1;
}
return NULL;
}
void cDvbPlayer::SetAudioTrack(int Index)
{
if ((audioTrack == 0xC0) != (Index == 0)) {
audioTrack = (Index == 1) ? 0xC1 : 0xC0;
Empty();
}
}
// --- cDvbPlayerControl -----------------------------------------------------
cDvbPlayerControl::cDvbPlayerControl(const char *FileName)
:cControl(player = new cDvbPlayer(FileName))
{
}
cDvbPlayerControl::~cDvbPlayerControl()
{
Stop();
}
bool cDvbPlayerControl::Active(void)
{
return player && player->Active();
}
void cDvbPlayerControl::Stop(void)
{
delete player;
player = NULL;
}
void cDvbPlayerControl::Pause(void)
{
if (player)
player->Pause();
}
void cDvbPlayerControl::Play(void)
{
if (player)
player->Play();
}
void cDvbPlayerControl::Forward(void)
{
if (player)
player->Forward();
}
void cDvbPlayerControl::Backward(void)
{
if (player)
player->Backward();
}
void cDvbPlayerControl::SkipSeconds(int Seconds)
{
if (player)
player->SkipSeconds(Seconds);
}
int cDvbPlayerControl::SkipFrames(int Frames)
{
if (player)
return player->SkipFrames(Frames);
return -1;
}
bool cDvbPlayerControl::GetIndex(int &Current, int &Total, bool SnapToIFrame)
{
if (player) {
player->GetIndex(Current, Total, SnapToIFrame);
return true;
}
return false;
}
bool cDvbPlayerControl::GetReplayMode(bool &Play, bool &Forward, int &Speed)
{
return player && player->GetReplayMode(Play, Forward, Speed);
}
void cDvbPlayerControl::Goto(int Position, bool Still)
{
if (player)
player->Goto(Position, Still);
}
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