How to decode AAC.

billcruse — Mon, 04 Oct 2010 14:24:27 GMT

hi...

I try to decode AAC data from RTSP stream. The GetFrame function wlways returns error (AAC_BAD_STREAM,UMC_ERR_INVALID_STREAM).
The code as follows.

a=rtpmap:98 mpeg4-generic/8000/2
a=fmtp:98 streamtype=5; profile-level-id=15; mode=AAC-hbr; config=1590; SizeLength=13;IndexLength=3; IndexDeltaLength=3; Profile=1;

pData ={

00 10 0a 60 21 0a 05 01 05 02 c2 10 a1 1c 89 b7 0c bb df 47 35 d6 6a f7 d4 e7 5c 65 3a e6 15 72
b4 ad 20 ec 5d bf 72 33 45 18 bc 4c 0c 4a 62 07 75 6d 01 8b e7 65 6d 75 91 66 7e 81 58 cc 7f fb
73 40 82 17 35 5c 9c 02 a2 0a e3 5d 09 b8 e8 2a b6 a8 a3 9a ac cf 90 02 86 f2 df 26 11 7f 3d fa\\
a3 4a 7c b9 29 73 f9 b1 cb 3f c3 a3 fe 28 46 3e 4b e9 d7 37 b0 dd fa 2f 31 e8 6c 11 85 10 48 6a
4f e8 d4 b9 70 db b8 b7 fe cb 6a 6d 8e e1 84 67 81 9e 33 6c 1c e8 11 0b 28 fc 8e 9e 97 24 2f 36
a6 5e 50 b4 d3 05 2f 7a 34 02 af d5 f1 ac 0c f7 62 3d 47 21 34 7d 02 8a 46 43 1a 7c a6 48 32 3f
52 c9 19 0b b6 f2 0c 76 7b b9 6f d0 c0 e9 ca d7 98 13 29 ba 7c f1 28 35 56 5c ae ac 30 ab 9a 9e
95 5e d8 b5 0d 75 13 13 db d5 d7 19 4e 89 50 f9 ea 4f eb 52 45 e9 f2 09 9f 36 ab af bf e2 3a 7a
ab 7d f9 9a b8 32 dc f5 f6 b4 98 d1 b3 8d 17 74 74 04 14 0b 08 42 84 72 20 7f 4e 19 77 be 8e 6b
ac 00 00 00 07 62 ed fb 91 9a 28 c5 e2 60 62 53 10 3b ab 68 0c 5f 3b 2b 6b ac 8b 33 f4 0a c6 63
ff db 9a 04 10 b9 aa e4 e0 15 10 57 1a c2 01 c0
};

iData=336;
resultSpecialHeaderSize = 4

// offset header
pData+=resultSpecialHeaderSize;
iData-=resultSpecialHeaderSize;

//UMC::AACDecoder
UMC::AudioCodec *pHandle=(UMC::AudioCodec *)m_pHandle;
UMC::MediaData *pDataIn=(UMC::MediaData *)m_pDataIn;
UMC::AudioData *pDataOut=(UMC::AudioData *)m_pDataOut;

pDataIn->SetBufferPointer(pData,iData);
pDataIn->SetDataSize(iData);

UMC::Status status ;

UMC::AudioCodecParams param;
param.m_info_in.sample_frequency = 8000;
param.m_info_in.bitrate = 32000;
param.m_info_in.bitPerSample = 16;
param.m_info_in.channels = 2;
param.m_info_in.stream_type = UMC::AAC_MPEG4_STREAM;
param.profile = AAC_PROFILE_MAIN;
param.m_pData = pDataIn;

if(pHandle->Init(&param)!=UMC::UMC_OK)
{
return false;
}

pDataIn->SetBufferPointer(pData,iData);
pDataIn->SetDataSize(iData);

if(!m_pDataOut)
{
m_pDataOut=PF_NEW(UMC::AudioData);
pDataOut=(UMC::AudioData *)m_pDataOut;
}

pDataOut->SetBufferPointer(pBuffer,iBuffer);

status = pHandle->GetFrame(pDataIn,pDataOut);
if(status!=UMC::UMC_OK)
return false;
(AAC_BAD_STREAM,UMC_ERR_INVALID_STREAM)

How to fix the error ?

Thx.

How to decode AAC.

billcruse — Tue, 05 Oct 2010 03:08:18 GMT

Attach AAC-Frame00~ACC-Frame59 data.

Thx

How to decode AAC.

VipinKumar_E_Intel — Wed, 03 Nov 2010 08:38:16 GMT

Have you tried the IPP samples? There are some good samples for AAC encoding and decoding in audio-video-codecs-samples

How to decode AAC.

VipinKumar_E_Intel — Wed, 03 Nov 2010 19:06:41 GMT

Actually, this is not a bug of AAC Decoder. Our decoder doesnt work with RTP packet, so stream should be properly prepared. First of all, you need to initialize decoder using AudioSpecifigConfig() (0x1590 in this case) and then pass audio data.You may find an example of this usage in the following forum discussion

http://software.intel.com/en-us/forums/showthread.php?t=74291

Vipin

topic How to decode AAC. in Intel® Integrated Performance Primitives

How to decode AAC.

How to decode AAC.

How to decode AAC.

How to decode AAC.