liveMedia/MPEG4GenericRTPSource.cpp File Reference

#include "MPEG4GenericRTPSource.hh"
#include "BitVector.hh"
#include "MPEG4LATMAudioRTPSource.hh"

Include dependency graph for MPEG4GenericRTPSource.cpp:

Go to the source code of this file.

Data Structures
class	MPEG4GenericBufferedPacket
class	MPEG4GenericBufferedPacketFactory
struct	AUHeader
Functions
unsigned	samplingFrequencyFromAudioSpecificConfig (char const *configStr)
Variables
static unsigned const	samplingFrequencyFromIndex [16]

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Function Documentation

unsigned samplingFrequencyFromAudioSpecificConfig

(

char const *

configStr

)

Definition at line 210 of file MPEG4GenericRTPSource.cpp.

References NULL, parseGeneralConfigStr(), and samplingFrequencyFromIndex.

Referenced by SubsessionIOState::setQTstate().

                                                                         {
  unsigned char* config = NULL;
  unsigned result = 0; // if returned, indicates an error

  do {
    // Begin by parsing the config string:
    unsigned configSize;
    config = parseGeneralConfigStr(configStr, configSize);
    if (config == NULL) break;

    if (configSize < 2) break;
    unsigned char samplingFrequencyIndex = ((config[0]&0x07)<<1) | (config[1]>>7);
    if (samplingFrequencyIndex < 15) {
      result = samplingFrequencyFromIndex[samplingFrequencyIndex];
      break;
    }

    // Index == 15 means that the actual frequency is next (24 bits):
    if (configSize < 5) break;
    result = ((config[1]&0x7F)<<17) | (config[2]<<9) | (config[3]<<1) | (config[4]>>7);
  } while (0);

  delete[] config;
  return result;
}

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Variable Documentation

unsigned const samplingFrequencyFromIndex[16] [static]

Initial value:

 {
  96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050,
  16000, 12000, 11025, 8000, 7350, 0, 0, 0
}

Definition at line 205 of file MPEG4GenericRTPSource.cpp.

Referenced by samplingFrequencyFromAudioSpecificConfig().

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