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AAC Decoder: flush/seek improvements

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Improve flushing and seeking.
Add field to the API stream info structure signaling the additional output
 delay for flushing and delay compensation.

Bug 9428126

Change-Id: I808412905563ea3de50a2e77a9b5dfee829cd2ed
This commit is contained in:
Jean-Michel Trivi 2014-05-20 17:24:06 -07:00
parent fb2e845179
commit af967fcc55
7 changed files with 108 additions and 26 deletions
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26
libAACdec/include/aacdecoder_lib.h
View File

@ -532,18 +532,18 @@ typedef enum
*/
typedef struct
{
/* These three members are the only really relevant ones for the user. */
/* These five members are the only really relevant ones for the user. */
INT sampleRate; /*!< The samplerate in Hz of the fully decoded PCM audio signal (after SBR processing). */
INT frameSize; /*!< The frame size of the decoded PCM audio signal. \n
1024 or 960 for AAC-LC \n
2048 or 1920 for HE-AAC (v2) \n
512 or 480 for AAC-LD and AAC-ELD */
INT numChannels; /*!< The number of output audio channels in the decoded and interleaved PCM audio signal. */
AUDIO_CHANNEL_TYPE *pChannelType; /*!< Audio channel type of each output audio channel. */
UCHAR *pChannelIndices; /*!< Audio channel index for each output audio channel.
AUDIO_CHANNEL_TYPE *pChannelType; /*!< Audio channel type of each output audio channel. */
UCHAR *pChannelIndices; /*!< Audio channel index for each output audio channel.
See ISO/IEC 13818-7:2005(E), 8.5.3.2 Explicit channel mapping using a program_config_element() */
/* Decoder internal members. */
INT aacSampleRate; /*!< sampling rate in Hz without SBR (from configuration info). */
INT aacSampleRate; /*!< Sampling rate in Hz without SBR (from configuration info). */
INT profile; /*!< MPEG-2 profile (from file header) (-1: not applicable (e. g. MPEG-4)). */
AUDIO_OBJECT_TYPE aot; /*!< Audio Object Type (from ASC): is set to the appropriate value for MPEG-2 bitstreams (e. g. 2 for AAC-LC). */
INT channelConfig; /*!< Channel configuration (0: PCE defined, 1: mono, 2: stereo, ... */
@ -556,7 +556,9 @@ typedef struct
AUDIO_OBJECT_TYPE extAot; /*!< Extension Audio Object Type (from ASC) */
INT extSamplingRate; /*!< Extension sampling rate in Hz (from ASC) */
UINT flags; /*!< Copy if internal flags. Only to be written by the decoder, and only to be read externally. */
UINT outputDelay; /*!< The number of samples the output is additionally delayed by the decoder. */
UINT flags; /*!< Copy of internal flags. Only to be written by the decoder, and only to be read externally. */
SCHAR epConfig; /*!< epConfig level (from ASC): only level 0 supported, -1 means no ER (e. g. AOT=2, MPEG-2 AAC, etc.) */
@ -681,11 +683,15 @@ aacDecoder_Fill ( HANDLE_AACDECODER self,
const UINT bufferSize[],
UINT *bytesValid );
#define AACDEC_CONCEAL 1 /*!< Flag for aacDecoder_DecodeFrame(): do not consider new input data. Do concealment. */
#define AACDEC_FLUSH 2 /*!< Flag for aacDecoder_DecodeFrame(): Do not consider new input data. Flush filterbanks (output delayed audio). */
#define AACDEC_INTR 4 /*!< Flag for aacDecoder_DecodeFrame(): Signal an input bit stream data discontinuity. Resync any internals as necessary. */
#define AACDEC_CLRHIST 8 /*!< Flag for aacDecoder_DecodeFrame(): Clear all signal delay lines and history buffers.
Caution: This can cause discontinuities in the output signal. */
#define AACDEC_CONCEAL 1 /*!< Flag for aacDecoder_DecodeFrame(): Trigger the built-in error concealment module \
to generate a substitute signal for one lost frame. New input data will not be
considered. */
#define AACDEC_FLUSH 2 /*!< Flag for aacDecoder_DecodeFrame(): Flush all filterbanks to get all delayed audio \
without having new input data. Thus new input data will not be considered.*/
#define AACDEC_INTR 4 /*!< Flag for aacDecoder_DecodeFrame(): Signal an input bit stream data discontinuity. \
Resync any internals as necessary. */
#define AACDEC_CLRHIST 8 /*!< Flag for aacDecoder_DecodeFrame(): Clear all signal delay lines and history buffers.\
CAUTION: This can cause discontinuities in the output signal. */
/**
* \brief Decode one audio frame

37
libAACdec/src/aacdecoder.cpp
View File

@ -717,6 +717,8 @@ void CStreamInfoInit(CStreamInfo *pStreamInfo)
pStreamInfo->numChannels = 0;
pStreamInfo->sampleRate = 0;
pStreamInfo->frameSize = 0;
pStreamInfo->outputDelay = 0;
}
/*!
@ -1184,11 +1186,8 @@ LINKSPEC_CPP AAC_DECODER_ERROR CAacDecoder_DecodeFrame(
CConcealment_InitChannelData(&self->pAacDecoderStaticChannelInfo[ch]->concealmentInfo,
&self->concealCommonData,
self->streamInfo.aacSamplesPerFrame );
/* Clear concealment buffers to get rid of the complete history */
FDKmemclear(self->pAacDecoderStaticChannelInfo[ch]->concealmentInfo.spectralCoefficient, 1024 * sizeof(FIXP_CNCL));
FDKmemclear(self->pAacDecoderStaticChannelInfo[ch]->concealmentInfo.specScale, 8 * sizeof(SHORT));
/* Clear overlap-add buffers to avoid clicks. */
FDKmemclear(self->pAacDecoderStaticChannelInfo[ch]->IMdct.overlap.freq, OverlapBufferSize*sizeof(FIXP_DBL));
FDKmemclear(self->pAacDecoderStaticChannelInfo[ch]->pOverlapBuffer, OverlapBufferSize*sizeof(FIXP_DBL));
}
}
@ -1508,10 +1507,19 @@ LINKSPEC_CPP AAC_DECODER_ERROR CAacDecoder_DecodeFrame(
break;
}
}
if (err == SBRDEC_OK) {
switch (err) {
case SBRDEC_PARSE_ERROR:
/* Can not go on parsing because we do not
know the length of the SBR extension data. */
FDKpushFor(bs, bitCnt);
bitCnt = 0;
break;
case SBRDEC_OK:
self->sbrEnabled = 1;
} else {
break;
default:
self->frameOK = 0;
break;
}
}
@ -1601,13 +1609,17 @@ LINKSPEC_CPP AAC_DECODER_ERROR CAacDecoder_DecodeFrame(
self->frameOK=0;
}
/* store or restore the number of channels */
/* store or restore the number of channels and the corresponding info */
if ( self->frameOK && !(flags &(AACDEC_CONCEAL|AACDEC_FLUSH)) ) {
self->concealChannels = aacChannels; /* store */
self->aacChannelsPrev = aacChannels; /* store */
FDKmemcpy(self->channelTypePrev, self->channelType, (8)*sizeof(AUDIO_CHANNEL_TYPE)); /* store */
FDKmemcpy(self->channelIndicesPrev, self->channelIndices, (8)*sizeof(UCHAR)); /* store */
self->sbrEnabledPrev = self->sbrEnabled;
} else {
if (self->aacChannels > 0) {
aacChannels = self->concealChannels; /* restore */
aacChannels = self->aacChannelsPrev; /* restore */
FDKmemcpy(self->channelType, self->channelTypePrev, (8)*sizeof(AUDIO_CHANNEL_TYPE)); /* restore */
FDKmemcpy(self->channelIndices, self->channelIndicesPrev, (8)*sizeof(UCHAR)); /* restore */
self->sbrEnabled = self->sbrEnabledPrev;
}
}
@ -1687,6 +1699,11 @@ LINKSPEC_CPP AAC_DECODER_ERROR CAacDecoder_DecodeFrame(
}
if ( flags&AACDEC_FLUSH ) {
/* Clear pAacDecoderChannelInfo->pSpectralCoefficient because with AACDEC_FLUSH set it contains undefined data. */
FDKmemclear(pAacDecoderChannelInfo->pSpectralCoefficient, sizeof(FIXP_DBL)*self->streamInfo.aacSamplesPerFrame);
}
/*
Conceal defective spectral data
*/
@ -1765,6 +1782,8 @@ LINKSPEC_CPP AAC_DECODER_ERROR CAacDecoder_DecodeFrame(
);
}
/* Add additional concealment delay */
self->streamInfo.outputDelay += CConcealment_GetDelay(&self->concealCommonData) * self->streamInfo.aacSamplesPerFrame;
/* Reorder channel type information tables. */
{

5
libAACdec/src/aacdecoder.h
View File

@ -198,7 +198,10 @@ struct AAC_DECODER_INSTANCE {
CAacDecoderCommonData aacCommonData; /*!< Temporal shared data for all channels hooked into pAacDecoderChannelInfo */
CConcealParams concealCommonData;
INT concealChannels;
INT aacChannelsPrev; /*!< The amount of AAC core channels of the last successful decode call. */
AUDIO_CHANNEL_TYPE channelTypePrev[(8)]; /*!< Array holding the channelType values of the last successful decode call. */
UCHAR channelIndicesPrev[(8)]; /*!< Array holding the channelIndices values of the last successful decode call. */
HANDLE_SBRDECODER hSbrDecoder; /*!< SBR decoder handle. */

14
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 7
#define AACDECODER_LIB_VL2 8
#define AACDECODER_LIB_TITLE "AAC Decoder Lib"
#define AACDECODER_LIB_BUILD_DATE __DATE__
#define AACDECODER_LIB_BUILD_TIME __TIME__
@ -842,6 +842,7 @@ LINKSPEC_CPP AAC_DECODER_ERROR aacDecoder_DecodeFrame(
/* Signal bit stream interruption to other modules if required. */
if ( fTpInterruption || (flags & (AACDEC_INTR|AACDEC_CLRHIST)) )
{
sbrDecoder_SetParam(self->hSbrDecoder, SBR_CLEAR_HISTORY, (flags&AACDEC_CLRHIST));
aacDecoder_SignalInterruption(self);
if ( ! (flags & AACDEC_INTR) ) {
ErrorStatus = AAC_DEC_TRANSPORT_SYNC_ERROR;
@ -857,6 +858,8 @@ LINKSPEC_CPP AAC_DECODER_ERROR aacDecoder_DecodeFrame(
self->streamInfo.numBadBytes = 0;
self->streamInfo.numTotalBytes = 0;
}
/* Reset the output delay field. The modules will add their figures one after another. */
self->streamInfo.outputDelay = 0;
if (self->limiterEnableUser==(UCHAR)-1) {
/* Enbale limiter for all non-lowdelay AOT's. */
@ -916,6 +919,9 @@ LINKSPEC_CPP AAC_DECODER_ERROR aacDecoder_DecodeFrame(
sbrDecoder_SetParam ( self->hSbrDecoder,
SBR_SYSTEM_BITSTREAM_DELAY,
self->sbrParams.bsDelay);
sbrDecoder_SetParam ( self->hSbrDecoder,
SBR_FLUSH_DATA,
(flags & AACDEC_FLUSH) );
if ( self->streamInfo.aot == AOT_ER_AAC_ELD ) {
/* Configure QMF */
@ -958,6 +964,9 @@ LINKSPEC_CPP AAC_DECODER_ERROR aacDecoder_DecodeFrame(
self->streamInfo.frameSize = self->streamInfo.aacSamplesPerFrame << 1;
}
}
/* Correct the additional concealment delay figures */
self->streamInfo.outputDelay -= self->sbrParams.bsDelay * self->streamInfo.aacSamplesPerFrame;
self->streamInfo.outputDelay += self->sbrParams.bsDelay * self->streamInfo.frameSize;
if (self->psPossible) {
self->flags |= AC_PS_PRESENT;
@ -1014,6 +1023,9 @@ LINKSPEC_CPP AAC_DECODER_ERROR aacDecoder_DecodeFrame(
self->extGainDelay,
self->streamInfo.frameSize
);
/* Announce the additional limiter output delay */
self->streamInfo.outputDelay += getLimiterDelay(self->hLimiter);
}
}

2
libSBRdec/include/sbrdecoder.h
View File

@ -145,6 +145,8 @@ typedef enum
SBR_SYSTEM_BITSTREAM_DELAY, /*!< System: Switch to enable an additional SBR bitstream delay of one frame. */
SBR_QMF_MODE, /*!< Set QMF mode, either complex or low power. */
SBR_LD_QMF_TIME_ALIGN, /*!< Set QMF type, either LD-MPS or CLDFB. Relevant for ELD streams only. */
SBR_FLUSH_DATA, /*!< Set internal state to flush the decoder with the next process call. */
SBR_CLEAR_HISTORY, /*!< Clear all internal states (delay lines, QMF states, ...). */
SBR_BS_INTERRUPTION /*!< Signal bit stream interruption. Value is ignored. */
} SBRDEC_PARAM;

2
libSBRdec/src/env_extr.h
View File

@ -179,6 +179,8 @@ typedef FREQ_BAND_DATA *HANDLE_FREQ_BAND_DATA;
#define SBRDEC_LOW_POWER 16 /* Flag indicating that Low Power QMF mode shall be used. */
#define SBRDEC_PS_DECODED 32 /* Flag indicating that PS was decoded and rendered. */
#define SBRDEC_LD_MPS_QMF 512 /* Flag indicating that the LD-MPS QMF shall be used. */
#define SBRDEC_FLUSH 16384 /* Flag is used to flush all elements in use. */
#define SBRDEC_FORCE_RESET 32768 /* Flag is used to force a reset of all elements in use. */
#define SBRDEC_HDR_STAT_RESET 1
#define SBRDEC_HDR_STAT_UPDATE 2

48
libSBRdec/src/sbrdecoder.cpp
View File

@ -137,7 +137,7 @@ amm-info@iis.fraunhofer.de
/* Decoder library info */
#define SBRDECODER_LIB_VL0 2
#define SBRDECODER_LIB_VL1 2
#define SBRDECODER_LIB_VL2 4
#define SBRDECODER_LIB_VL2 5
#define SBRDECODER_LIB_TITLE "SBR Decoder"
#define SBRDECODER_LIB_BUILD_DATE __DATE__
#define SBRDECODER_LIB_BUILD_TIME __TIME__
@ -444,6 +444,7 @@ SBR_ERROR sbrDecoder_InitElement (
&& self->coreCodec == coreCodec
&& self->pSbrElement[elementIndex] != NULL
&& self->pSbrElement[elementIndex]->elementID == elementID
&& !(self->flags & SBRDEC_FORCE_RESET)
)
{
/* Nothing to do */
@ -550,8 +551,9 @@ bail:
if (nSbrElementsStart < self->numSbrElements) {
/* Free the memory allocated for this element */
sbrDecoder_DestroyElement( self, elementIndex );
} else if (self->pSbrElement[elementIndex] != NULL) {
/* Set error flag to trigger concealment */
} else if ( (self->pSbrElement[elementIndex] != NULL)
&& (elementIndex < (8)))
{ /* Set error flag to trigger concealment */
self->pSbrElement[elementIndex]->frameErrorFlag[self->pSbrElement[elementIndex]->useFrameSlot] = 1;
}
}
@ -728,6 +730,24 @@ SBR_ERROR sbrDecoder_SetParam (HANDLE_SBRDECODER self,
}
}
break;
case SBR_FLUSH_DATA:
if (value != 0) {
if (self == NULL) {
errorStatus = SBRDEC_NOT_INITIALIZED;
} else {
self->flags |= SBRDEC_FLUSH;
}
}
break;
case SBR_CLEAR_HISTORY:
if (value != 0) {
if (self == NULL) {
errorStatus = SBRDEC_NOT_INITIALIZED;
} else {
self->flags |= SBRDEC_FORCE_RESET;
}
}
break;
case SBR_BS_INTERRUPTION:
{
int elementIndex;
@ -738,7 +758,8 @@ SBR_ERROR sbrDecoder_SetParam (HANDLE_SBRDECODER self,
}
/* Loop over SBR elements */
for (elementIndex = 0; elementIndex < self->numSbrElements; elementIndex++)
for (elementIndex = 0; elementIndex < self->numSbrElements; elementIndex++) {
if (self->pSbrElement[elementIndex] != NULL)
{
HANDLE_SBR_HEADER_DATA hSbrHeader;
int headerIndex = getHeaderSlot(self->pSbrElement[elementIndex]->useFrameSlot,
@ -750,7 +771,7 @@ SBR_ERROR sbrDecoder_SetParam (HANDLE_SBRDECODER self,
This switches off bitstream parsing until a new header arrives. */
hSbrHeader->syncState = UPSAMPLING;
hSbrHeader->status |= SBRDEC_HDR_STAT_UPDATE;
}
} }
}
break;
default:
@ -1119,6 +1140,10 @@ SBR_ERROR sbrDecoder_Parse(
}
}
}
} else {
/* The returned bit count will not be the actual payload size since we did not
parse the frame data. Return an error so that the caller can react respectively. */
errorStatus = SBRDEC_PARSE_ERROR;
}
if (!fDoDecodeSbrData) {
@ -1198,6 +1223,15 @@ sbrDecoder_DecodeElement (
int stereo = (hSbrElement->elementID == ID_CPE) ? 1 : 0;
int numElementChannels = hSbrElement->nChannels; /* Number of channels of the current SBR element */
if (self->flags & SBRDEC_FLUSH) {
/* Move frame pointer to the next slot which is up to be decoded/applied next */
hSbrElement->useFrameSlot = (hSbrElement->useFrameSlot+1) % (self->numDelayFrames+1);
/* Update header and frame data pointer because they have already been set */
hSbrHeader = &self->sbrHeader[elementIndex][hSbrElement->useHeaderSlot[hSbrElement->useFrameSlot]];
hFrameDataLeft = &hSbrElement->pSbrChannel[0]->frameData[hSbrElement->useFrameSlot];
hFrameDataRight = &hSbrElement->pSbrChannel[1]->frameData[hSbrElement->useFrameSlot];
}
/* Update the header error flag */
hSbrHeader->frameErrorFlag = hSbrElement->frameErrorFlag[hSbrElement->useFrameSlot];
@ -1472,6 +1506,10 @@ SBR_ERROR sbrDecoder_Apply ( HANDLE_SBRDECODER self,
/* Clear reset and flush flag because everything seems to be done successfully. */
self->flags &= ~SBRDEC_FORCE_RESET;
self->flags &= ~SBRDEC_FLUSH;
bail:
return errorStatus;