static status_t parseStreamMuxConfig(
ABitReader *bits,
unsigned *numSubFrames,
unsigned *frameLengthType,
ssize_t *fixedFrameLength,
bool *otherDataPresent,
unsigned *otherDataLenBits) {
unsigned audioMuxVersion = bits->getBits(1);
unsigned audioMuxVersionA = 0;
if (audioMuxVersion == 1) {
audioMuxVersionA = bits->getBits(1);
}
CHECK_EQ(audioMuxVersionA, 0u); // otherwise future spec
if (audioMuxVersion != 0) {
return ERROR_UNSUPPORTED; // XXX to be implemented;
}
CHECK_EQ(audioMuxVersion, 0u); // XXX to be implemented
unsigned allStreamsSameTimeFraming = bits->getBits(1);
CHECK_EQ(allStreamsSameTimeFraming, 1u); // There's only one stream.
*numSubFrames = bits->getBits(6);
unsigned numProgram = bits->getBits(4);
CHECK_EQ(numProgram, 0u); // disabled in RTP LATM
unsigned numLayer = bits->getBits(3);
CHECK_EQ(numLayer, 0u); // disabled in RTP LATM
if (audioMuxVersion == 0) {
// AudioSpecificConfig
CHECK_EQ(parseAudioSpecificConfig(bits, NULL /* asc */), (status_t)OK);
} else {
TRESPASS(); // XXX to be implemented
}
*frameLengthType = bits->getBits(3);
*fixedFrameLength = -1;
switch (*frameLengthType) {
case 0:
{
/* unsigned bufferFullness = */bits->getBits(8);
// The "coreFrameOffset" does not apply since there's only
// a single layer.
break;
}
case 1:
{
*fixedFrameLength = bits->getBits(9);
break;
}
case 2:
{
return ERROR_UNSUPPORTED;
}
case 3:
case 4:
case 5:
{
/* unsigned CELPframeLengthTableIndex = */bits->getBits(6);
break;
}
case 6:
case 7:
{
/* unsigned HVXCframeLengthTableIndex = */bits->getBits(1);
break;
}
default:
break;
}
*otherDataPresent = bits->getBits(1);
*otherDataLenBits = 0;
if (*otherDataPresent) {
if (audioMuxVersion == 1) {
TRESPASS(); // XXX to be implemented
} else {
*otherDataLenBits = 0;
unsigned otherDataLenEsc;
do {
(*otherDataLenBits) <<= 8;
otherDataLenEsc = bits->getBits(1);
unsigned otherDataLenTmp = bits->getBits(8);
(*otherDataLenBits) += otherDataLenTmp;
} while (otherDataLenEsc);
}
}
unsigned crcCheckPresent = bits->getBits(1);
if (crcCheckPresent) {
/* unsigned crcCheckSum = */bits->getBits(8);
}
return OK;
}
static status_t parseStreamMuxConfig(
ABitReader *bits,
unsigned *numSubFrames,
unsigned *frameLengthType,
ssize_t *fixedFrameLength,
bool *otherDataPresent,
unsigned *otherDataLenBits) {
unsigned audioMuxVersion = bits->getBits(1);
unsigned audioMuxVersionA = 0;
if (audioMuxVersion == 1) {
audioMuxVersionA = bits->getBits(1);
}
CHECK_EQ(audioMuxVersionA, 0u); // otherwise future spec
if (audioMuxVersion != 0) {
return ERROR_UNSUPPORTED; // XXX to be implemented;
}
CHECK_EQ(audioMuxVersion, 0u); // XXX to be implemented
unsigned allStreamsSameTimeFraming = bits->getBits(1);
CHECK_EQ(allStreamsSameTimeFraming, 1u); // There's only one stream.
*numSubFrames = bits->getBits(6);
unsigned numProgram = bits->getBits(4);
CHECK_EQ(numProgram, 0u); // disabled in RTP LATM
unsigned numLayer = bits->getBits(3);
CHECK_EQ(numLayer, 0u); // disabled in RTP LATM
if (audioMuxVersion == 0) {
// AudioSpecificConfig
CHECK_EQ(parseAudioSpecificConfig(bits, NULL /* asc */), (status_t)OK);
} else {
TRESPASS(); // XXX to be implemented
}
*frameLengthType = bits->getBits(3);
*fixedFrameLength = -1;
switch (*frameLengthType) {
case 0:
{
/* unsigned bufferFullness = */bits->getBits(8);
// The "coreFrameOffset" does not apply since there's only
// a single layer.
break;
}
case 1:
{
*fixedFrameLength = bits->getBits(9);
break;
}
case 2:
{
// reserved
TRESPASS();
break;
}
case 3:
case 4:
case 5:
{
/* unsigned CELPframeLengthTableIndex = */bits->getBits(6);
break;
}
case 6:
case 7:
{
/* unsigned HVXCframeLengthTableIndex = */bits->getBits(1);
break;
}
default:
break;
}
#ifdef STE_HARDWARE
status_t parseResult = OK;
#endif
*otherDataPresent = bits->getBits(1);
*otherDataLenBits = 0;
if (*otherDataPresent) {
if (audioMuxVersion == 1) {
TRESPASS(); // XXX to be implemented
#ifdef STE_HARDWARE
} else if (bits->numBitsLeft() < 9) {
parseResult = ERROR_MALFORMED;
#endif
} else {
*otherDataLenBits = 0;
unsigned otherDataLenEsc;
do {
(*otherDataLenBits) <<= 8;
otherDataLenEsc = bits->getBits(1);
unsigned otherDataLenTmp = bits->getBits(8);
(*otherDataLenBits) += otherDataLenTmp;
#ifdef STE_HARDWARE
} while (otherDataLenEsc && bits->numBitsLeft() >= 9);
if (otherDataLenEsc) {
parseResult = ERROR_MALFORMED;
}
}
}
if (parseResult == OK && bits->numBitsLeft() >= 1) {
unsigned crcCheckPresent = bits->getBits(1);
if (crcCheckPresent && bits->numBitsLeft() >= 8) {
/* unsigned crcCheckSum = */bits->getBits(8);
} else if (crcCheckPresent && bits->numBitsLeft() < 8) {
parseResult = ERROR_MALFORMED;
}
} else {
parseResult = ERROR_MALFORMED;
}
// Verify that only bits are left for byte aligning and that
// any remaining bits are 0
if (bits->numBitsLeft() / 8 > 0) {
parseResult = ERROR_MALFORMED;
} else {
unsigned remainder = bits->getBits(bits->numBitsLeft());
if (remainder != 0) {
parseResult = ERROR_MALFORMED;
#else
} while (otherDataLenEsc);
#endif
}
}
