EVOLUTION-MANAGER

Edit File: vorbisExtractor.cpp

#include <iostream>
#include <cstring>

#include "vorbisExtractor.h"
#include "vorbisStreamParameter.h"
#include "oggHeader.h"
#include "vorbisHeader.h"

VorbisExtractor::VorbisExtractor()
{
}

VorbisExtractor::~VorbisExtractor()
{
}

bool VorbisExtractor::_extract(uint8* data, ExtractorInformation& info)
{

StreamType*   streaminfo   = (StreamType*) (data);
  VorbisHeader* vorbisHeader = (VorbisHeader*) (data + sizeof(StreamType));

/* if this is not a vorbis header, return with an error */
  if ((streaminfo->headerType != 0x01) ||
      (strncmp(streaminfo->typeName, "vorbis", 6) != 0)) {
    std::cerr << "VorbisExtractor::_extract: This page is not a vorbis bos\n";
    return(false);
  }

// first extract the parameters
  VorbisStreamParameter* param = new VorbisStreamParameter;

param->channels = vorbisHeader->audioChannels;
  param->samplerate = vorbisHeader->sampleRate;
  param->datarate   = vorbisHeader->bitrateNom;
  param->block0   = 1<<vorbisHeader->blocksize0;
  param->block1   = 1<<vorbisHeader->blocksize1;

if (info.parameter)
    delete info.parameter;

info.parameter = param;

/* set the ogg type and the number of header packets */
  info.type = ogg_vorbis;
  info.numOfHeaderPackets = 3; // the first three packets are headers

return(true);
}

bool VorbisExtractor::extract(OggPage& oggPage, ExtractorInformation& information)
{
  /* if this is not a Begin Of Stream page, return immediately */
  if (!oggPage.isBOS()) {
    std::cerr << "VorbisPosInterpreter::extract: This page is not a BOS (Begin Of Stream) page\n";
    return(false);
  }

/* get the information starting points within the raw data */
  OggHeader* oggHeader  = (OggHeader*) (oggPage.data());
  uint8*     data       = (oggPage.data() + sizeof(OggHeader) + oggHeader->tableSegments);

if (_extract(data, information) == false)
    return(false);

information.serialNo = oggHeader->serial;

return(true);
}

bool VorbisExtractor::extract(OggPacket& packet, ExtractorInformation& information)
{
  /// if this is not a Begin Of Stream page, return immediately
  if (!packet.isBOS()) {
    std::cerr << "VorbisPosInterpreter::extract: This page is not a BOS (Begin Of Stream) page\n";
    return(false);
  }

if (_extract(packet.data(), information) == false)
    return(false);

return(true);
}