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Decoder parse ASC 

* AAC-Decoder

   - Add support for explicit backward compatible signaling via ASC extension.

Bug 9428126

Change-Id: I0cb8226da07e3684bbb7eb95d10b6040973aa0f6
This commit is contained in:
Jean-Michel Trivi 2013-08-27 16:35:59 -07:00
parent 5016eb7f65
commit 206a397c70
3 changed files with 61 additions and 2 deletions
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2
libAACdec/src/aacdecoder_lib.cpp
View File

@ -110,7 +110,7 @@ amm-info@iis.fraunhofer.de
/* Decoder library info */
#define AACDECODER_LIB_VL0 2
#define AACDECODER_LIB_VL1 5
#define AACDECODER_LIB_VL2 4
#define AACDECODER_LIB_VL2 5
#define AACDECODER_LIB_TITLE "AAC Decoder Lib"
#define AACDECODER_LIB_BUILD_DATE __DATE__
#define AACDECODER_LIB_BUILD_TIME __TIME__

59
libMpegTPDec/src/tpdec_asc.cpp
View File

@ -834,6 +834,62 @@ bail:
#endif /* TP_ELD_ENABLE */
static
TRANSPORTDEC_ERROR AudioSpecificConfig_ExtensionParse(CSAudioSpecificConfig *self, HANDLE_FDK_BITSTREAM bs, CSTpCallBacks *cb)
{
TP_ASC_EXTENSION_ID lastAscExt, ascExtId = ASCEXT_UNKOWN;
INT bitsAvailable = (INT)FDKgetValidBits(bs);
while (bitsAvailable >= 11)
{
lastAscExt = ascExtId;
ascExtId = (TP_ASC_EXTENSION_ID)FDKreadBits(bs, 11);
bitsAvailable -= 11;
switch (ascExtId) {
case ASCEXT_SBR: /* 0x2b7 */
if ( (self->m_extensionAudioObjectType != AOT_SBR) && (bitsAvailable >= 5) ) {
self->m_extensionAudioObjectType = getAOT(bs);
if ( (self->m_extensionAudioObjectType == AOT_SBR)
|| (self->m_extensionAudioObjectType == AOT_ER_BSAC) )
{ /* Get SBR extension configuration */
self->m_sbrPresentFlag = FDKreadBits(bs, 1);
bitsAvailable -= 1;
if ( self->m_sbrPresentFlag == 1 ) {
self->m_extensionSamplingFrequency = getSampleRate(bs, &self->m_extensionSamplingFrequencyIndex, 4);
if ((INT)self->m_extensionSamplingFrequency <= 0) {
return TRANSPORTDEC_PARSE_ERROR;
}
}
if ( self->m_extensionAudioObjectType == AOT_ER_BSAC ) {
self->m_extensionChannelConfiguration = FDKreadBits(bs, 4);
bitsAvailable -= 4;
}
}
/* Update counter because of variable length fields (AOT and sampling rate) */
bitsAvailable = (INT)FDKgetValidBits(bs);
}
break;
case ASCEXT_PS: /* 0x548 */
if ( (lastAscExt == ASCEXT_SBR)
&& (self->m_extensionAudioObjectType == AOT_SBR)
&& (bitsAvailable > 0) )
{ /* Get PS extension configuration */
self->m_psPresentFlag = FDKreadBits(bs, 1);
bitsAvailable -= 1;
}
break;
default:
/* Just ignore anything. */
return TRANSPORTDEC_OK;
}
}
return TRANSPORTDEC_OK;
}
/*
* API Functions
@ -984,6 +1040,9 @@ TRANSPORTDEC_ERROR AudioSpecificConfig_Parse(
break;
}
if (fExplicitBackwardCompatible) {
ErrorStatus = AudioSpecificConfig_ExtensionParse(self, bs, cb);
}
return (ErrorStatus);
}

2
libMpegTPDec/src/version
View File

@ -2,7 +2,7 @@
/* library info */
#define TP_LIB_VL0 2
#define TP_LIB_VL1 3
#define TP_LIB_VL2 2
#define TP_LIB_VL2 3
#define TP_LIB_TITLE "MPEG Transport"
#define TP_LIB_BUILD_DATE __DATE__
#define TP_LIB_BUILD_TIME __TIME__