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transfer.c

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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 1.8 2002/12/14 13:14:53 kls Exp $
 */

#include "transfer.h"

//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)

// --- cTransfer -------------------------------------------------------------

cTransfer::cTransfer(int VPid, int APid1, int APid2, int DPid1, int DPid2)
:cReceiver(0, -1, 5, VPid, APid1, APid2, DPid1, DPid2)
{
  ringBuffer = new cRingBufferLinear(VIDEOBUFSIZE, true);
  remux = new cRemux(VPid, APid1, APid2, DPid1, DPid2);
  canToggleAudioTrack = false;
  audioTrack = 0xC0;
  gotBufferReserve = false;
  active = false;
}

cTransfer::~cTransfer()
{
  cReceiver::Detach();
  cPlayer::Detach();
  delete remux;
  delete ringBuffer;
}

void cTransfer::Activate(bool On)
{
  if (On) {
     if (!active)
        Start();
     }
  else if (active) {
     active = false;
     Cancel(3);
     }
}

void cTransfer::Receive(uchar *Data, int Length)
{
  if (IsAttached()) {
     int p = ringBuffer->Put(Data, Length);
     if (p != Length && active)
        esyslog("ERROR: ring buffer overflow (%d bytes dropped)", Length - p);
     }
}

void cTransfer::Action(void)
{
  dsyslog("transfer thread started (pid=%d)", getpid());

  uchar b[MINVIDEODATA];
  int r = 0;
  active = true;
  while (active) {

        //XXX+ Maybe we need this to avoid "buffer empty" log messages from the driver.
        //XXX+ But then again, it appears to play just fine without this...
        /*
        if (!gotBufferReserve) {
           if (ringBuffer->Available() < 4 * MAXFRAMESIZE) {
              usleep(100000); // allow the buffer to collect some reserve
              continue;
              }
           else
              gotBufferReserve = true;
           }
           */

        // Get data from the buffer:

        int g = ringBuffer->Get(b + r, sizeof(b) - r);
        if (g > 0)
           r += g;

        // Play the data:

        if (r > 0) {
           int Count = r, Result;
           uchar *p = remux->Process(b, Count, Result);
           if (p) {
              StripAudioPackets(p, Result, audioTrack);
              while (Result > 0 && active) {
                    int w = PlayVideo(p, Result);
                    if (w > 0) {
                       p += w;
                       Result -= w;
                       }
                    else if (w < 0 && FATALERRNO) {
                       LOG_ERROR;
                       break;
                       }
                    }
              }
           if (Count > 0) {
              r -= Count;
              if (r > 0)
                 memmove(b, b + Count, r);
              }
           }
        else
           usleep(1); // this keeps the CPU load low
        }

  dsyslog("transfer thread ended (pid=%d)", getpid());
}

void cTransfer::StripAudioPackets(uchar *b, int Length, uchar Except)
{
  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*/
      }
}

int cTransfer::NumAudioTracks(void) const
{
  return canToggleAudioTrack ? 2 : 1;
}

const char **cTransfer::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 cTransfer::SetAudioTrack(int Index)
{
  if ((audioTrack == 0xC0) != (Index == 0)) {
     audioTrack = (Index == 1) ? 0xC1 : 0xC0;
     DeviceClear();
     }
}

// --- cTransferControl ------------------------------------------------------

cTransferControl::cTransferControl(cDevice *ReceiverDevice, int VPid, int APid1, int APid2, int DPid1, int DPid2)
:cControl(transfer = new cTransfer(VPid, APid1, APid2, DPid1, DPid2), true)
{
  ReceiverDevice->AttachReceiver(transfer);
}

cTransferControl::~cTransferControl()
{
  delete transfer;
}

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