audio.c

00001 /*
00002  * audio.c: The basic audio interface
00003  *
00004  * See the main source file 'vdr.c' for copyright information and
00005  * how to reach the author.
00006  *
00007  * $Id: audio.c 1.2 2002/11/03 11:53:34 kls Exp $
00008  */
00009 
00010 #include "audio.h"
00011 #include "stdlib.h"
00012 
00013 // --- cAudio ----------------------------------------------------------------
00014 
00015 cAudio::cAudio(void)
00016 {
00017   Audios.Add(this);
00018 }
00019 
00020 cAudio::~cAudio()
00021 {
00022 }
00023 
00024 // --- cAudios ---------------------------------------------------------------
00025 
00026 cAudios Audios;
00027 
00028 void cAudios::PlayAudio(const uchar *Data, int Length)
00029 {
00030   for (cAudio *audio = First(); audio; audio = Next(audio))
00031       audio->Play(Data, Length);
00032 }
00033 
00034 void cAudios::MuteAudio(bool On)
00035 {
00036   for (cAudio *audio = First(); audio; audio = Next(audio))
00037       audio->Mute(On);
00038 }
00039 
00040 void cAudios::ClearAudio(void)
00041 {
00042   for (cAudio *audio = First(); audio; audio = Next(audio))
00043       audio->Clear();
00044 }
00045 
00046 // --- cExternalAudio --------------------------------------------------------
00047 
00048 cExternalAudio::cExternalAudio(const char *Command)
00049 {
00050   command = strdup(Command);
00051   mute = false;
00052 }
00053 
00054 cExternalAudio::~cExternalAudio()
00055 {
00056   free(command);
00057 }
00058 
00059 void cExternalAudio::Play(const uchar *Data, int Length)
00060 {
00061   if (command && !mute) {
00062      if (pipe || pipe.Open(command, "w")) {
00063         if (Data[0] == 0x00 && Data[1] == 0x00 && Data[2] == 0x01) {
00064            if (Data[3] == 0xBD) { // dolby
00065               //XXX??? int written = Data[8] + (skipAC3bytes ? 13 : 9); // skips the PES header
00066               int written = Data[8] + 9; // skips the PES header
00067               Length -= written;
00068               while (Length > 0) {
00069                     int w = fwrite(Data + written, 1, Length, pipe);
00070                     if (w < 0) {
00071                        LOG_ERROR;
00072                        break;
00073                        }
00074                     Length -= w;
00075                     written += w;
00076                     }
00077               }
00078            }
00079         }
00080      else {
00081         esyslog("ERROR: can't open pipe to audio command '%s'", command);
00082         free(command);
00083         command = NULL;
00084         }
00085      }
00086 }
00087 
00088 void cExternalAudio::Mute(bool On)
00089 {
00090   mute = On;
00091   if (mute)
00092      Clear();
00093 }
00094 
00095 void cExternalAudio::Clear(void)
00096 {
00097   pipe.Close();
00098 }