audio.c


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/*
 * audio.c: The basic audio interface
 *
 * See the main source file 'vdr.c' for copyright information and
 * how to reach the author.
 *
 * $Id: audio.c 1.2 2002/11/03 11:53:34 kls Exp $
 */

#include "audio.h"
#include "stdlib.h"

// --- cAudio ----------------------------------------------------------------

cAudio::cAudio(void)
{
  Audios.Add(this);
}

cAudio::~cAudio()
{
}

// --- cAudios ---------------------------------------------------------------

cAudios Audios;

void cAudios::PlayAudio(const uchar *Data, int Length)
{
  for (cAudio *audio = First(); audio; audio = Next(audio))
      audio->Play(Data, Length);
}

void cAudios::MuteAudio(bool On)
{
  for (cAudio *audio = First(); audio; audio = Next(audio))
      audio->Mute(On);
}

void cAudios::ClearAudio(void)
{
  for (cAudio *audio = First(); audio; audio = Next(audio))
      audio->Clear();
}

// --- cExternalAudio --------------------------------------------------------

cExternalAudio::cExternalAudio(const char *Command)
{
  command = strdup(Command);
  mute = false;
}

cExternalAudio::~cExternalAudio()
{
  free(command);
}

void cExternalAudio::Play(const uchar *Data, int Length)
{
  if (command && !mute) {
     if (pipe || pipe.Open(command, "w")) {
        if (Data[0] == 0x00 && Data[1] == 0x00 && Data[2] == 0x01) {
           if (Data[3] == 0xBD) { // dolby
              //XXX??? int written = Data[8] + (skipAC3bytes ? 13 : 9); // skips the PES header
              int written = Data[8] + 9; // skips the PES header
              Length -= written;
              while (Length > 0) {
                    int w = fwrite(Data + written, 1, Length, pipe);
                    if (w < 0) {
                       LOG_ERROR;
                       break;
                       }
                    Length -= w;
                    written += w;
                    }
              }
           }
        }
     else {
        esyslog("ERROR: can't open pipe to audio command '%s'", command);
        free(command);
        command = NULL;
        }
     }
}

void cExternalAudio::Mute(bool On)
{
  mute = On;
  if (mute)
     Clear();
}

void cExternalAudio::Clear(void)
{
  pipe.Close();
}