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Diffstat (limited to 'libSBRenc/src/sbr_encoder.cpp')
-rw-r--r--libSBRenc/src/sbr_encoder.cpp113
1 files changed, 106 insertions, 7 deletions
diff --git a/libSBRenc/src/sbr_encoder.cpp b/libSBRenc/src/sbr_encoder.cpp
index 9bb98c8..90b19cf 100644
--- a/libSBRenc/src/sbr_encoder.cpp
+++ b/libSBRenc/src/sbr_encoder.cpp
@@ -103,7 +103,7 @@ amm-info@iis.fraunhofer.de
#define SBRENCODER_LIB_VL0 3
#define SBRENCODER_LIB_VL1 3
-#define SBRENCODER_LIB_VL2 8
+#define SBRENCODER_LIB_VL2 12
@@ -412,6 +412,23 @@ FDKsbrEnc_AdjustSbrSettings (const sbrConfigurationPtr config, /*! output, modif
config->codecSettings.transFac = transFac;
config->codecSettings.standardBitrate = standardBitrate;
+ if (bitRate < 28000) {
+ config->threshold_AmpRes_FF_m = (FIXP_DBL)MAXVAL_DBL;
+ config->threshold_AmpRes_FF_e = 7;
+ }
+ else if (bitRate >= 28000 && bitRate <= 48000) {
+ /* The float threshold is 75
+ 0.524288f is fractional part of RELAXATION, the quotaMatrix and therefore tonality are scaled by this
+ 2/3 is because the original implementation divides the tonality values by 3, here it's divided by 2
+ 128 compensates the necessary shiftfactor of 7 */
+ config->threshold_AmpRes_FF_m = FL2FXCONST_DBL(75.0f*0.524288f/(2.0f/3.0f)/128.0f);
+ config->threshold_AmpRes_FF_e = 7;
+ }
+ else if (bitRate > 48000) {
+ config->threshold_AmpRes_FF_m = FL2FXCONST_DBL(0);
+ config->threshold_AmpRes_FF_e = 0;
+ }
+
if (bitRate==0) {
/* map vbr quality to bitrate */
if (vbrMode < 30)
@@ -467,6 +484,57 @@ FDKsbrEnc_AdjustSbrSettings (const sbrConfigurationPtr config, /*! output, modif
config->stereoMode = sbrTuningTable[idx].stereoMode ;
config->freqScale = sbrTuningTable[idx].freqScale ;
+ if (numChannels == 1) {
+ /* stereo case */
+ switch (core) {
+ case AOT_AAC_LC:
+ if (bitRate <= (useSpeechConfig?24000U:20000U)) {
+ config->freq_res_fixfix[0] = FREQ_RES_LOW; /* set low frequency resolution for non-split frames */
+ config->freq_res_fixfix[1] = FREQ_RES_LOW; /* set low frequency resolution for split frames */
+ }
+ break;
+ case AOT_ER_AAC_ELD:
+ if (bitRate < 36000)
+ config->freq_res_fixfix[1] = FREQ_RES_LOW; /* set low frequency resolution for split frames */
+ if (bitRate < 26000) {
+ config->freq_res_fixfix[0] = FREQ_RES_LOW; /* set low frequency resolution for non-split frames */
+ config->fResTransIsLow = 1; /* for transient frames, set low frequency resolution */
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ else {
+ /* stereo case */
+ switch (core) {
+ case AOT_AAC_LC:
+ if (bitRate <= 28000) {
+ config->freq_res_fixfix[0] = FREQ_RES_LOW; /* set low frequency resolution for non-split frames */
+ config->freq_res_fixfix[1] = FREQ_RES_LOW; /* set low frequency resolution for split frames */
+ }
+ break;
+ case AOT_ER_AAC_ELD:
+ if (bitRate < 72000) {
+ config->freq_res_fixfix[1] = FREQ_RES_LOW; /* set low frequency resolution for split frames */
+ }
+ if (bitRate < 52000) {
+ config->freq_res_fixfix[0] = FREQ_RES_LOW; /* set low frequency resolution for non-split frames */
+ config->fResTransIsLow = 1; /* for transient frames, set low frequency resolution */
+ }
+ break;
+ default:
+ break;
+ }
+ if (bitRate <= 28000) {
+ /*
+ additionally restrict frequency resolution in FIXFIX frames
+ to further reduce SBR payload size */
+ config->freq_res_fixfix[0] = FREQ_RES_LOW;
+ config->freq_res_fixfix[1] = FREQ_RES_LOW;
+ }
+ }
+
/* adjust usage of parametric coding dependent on bitrate and speech config flag */
if (useSpeechConfig)
config->parametricCoding = 0;
@@ -515,6 +583,7 @@ static UINT
FDKsbrEnc_InitializeSbrDefaults (sbrConfigurationPtr config,
INT downSampleFactor,
UINT codecGranuleLen
+ ,const INT isLowDelay
)
{
if ( (downSampleFactor < 1 || downSampleFactor > 2) ||
@@ -525,7 +594,11 @@ FDKsbrEnc_InitializeSbrDefaults (sbrConfigurationPtr config,
config->useWaveCoding = 0;
config->crcSbr = 0;
config->dynBwSupported = 1;
- config->tran_thr = 13000;
+ if (isLowDelay)
+ config->tran_thr = 6000;
+ else
+ config->tran_thr = 13000;
+
config->parametricCoding = 1;
config->sbrFrameSize = codecGranuleLen * downSampleFactor;
@@ -558,7 +631,9 @@ FDKsbrEnc_InitializeSbrDefaults (sbrConfigurationPtr config,
config->noiseFloorOffset = 0;
config->startFreq = 5; /* 5.9 respectively 6.0 kHz at fs = 44.1/48 kHz */
config->stopFreq = 9; /* 16.2 respectively 16.8 kHz at fs = 44.1/48 kHz */
-
+ config->freq_res_fixfix[0] = FREQ_RES_HIGH; /* non-split case */
+ config->freq_res_fixfix[1] = FREQ_RES_HIGH; /* split case */
+ config->fResTransIsLow = 0; /* for transient frames, set variable frequency resolution according to freqResTable */
/* header_extra_1 */
config->freqScale = SBR_FREQ_SCALE_DEFAULT;
@@ -1206,7 +1281,10 @@ initEnvChannel ( HANDLE_SBR_CONFIG_DATA sbrConfigData,
FDK_ASSERT(params->e >= 0);
- hEnv->encEnvData.freq_res_fixfix = 1;
+ hEnv->encEnvData.freq_res_fixfix[0] = params->freq_res_fixfix[0];
+ hEnv->encEnvData.freq_res_fixfix[1] = params->freq_res_fixfix[1];
+ hEnv->encEnvData.fResTransIsLow = params->fResTransIsLow;
+
hEnv->fLevelProtect = 0;
hEnv->encEnvData.ldGrid = (sbrConfigData->sbrSyntaxFlags & SBR_SYNTAX_LOW_DELAY) ? 1 : 0;
@@ -1348,11 +1426,29 @@ initEnvChannel ( HANDLE_SBR_CONFIG_DATA sbrConfigData,
e,
params->stat,
timeSlots,
- hEnv->encEnvData.freq_res_fixfix
- ,hEnv->encEnvData.ldGrid
+ hEnv->encEnvData.freq_res_fixfix,
+ hEnv->encEnvData.fResTransIsLow,
+ hEnv->encEnvData.ldGrid
);
+ if(sbrConfigData->sbrSyntaxFlags & SBR_SYNTAX_LOW_DELAY)
+ {
+ INT bandwidth_qmf_slot = (sbrConfigData->sampleFreq>>1) / (sbrConfigData->noQmfBands);
+ if(FDKsbrEnc_InitSbrFastTransientDetector(
+ &hEnv->sbrFastTransientDetector,
+ sbrConfigData->noQmfSlots,
+ bandwidth_qmf_slot,
+ sbrConfigData->noQmfBands,
+ sbrConfigData->freqBandTable[0][0]
+ ))
+ return(1);
+ }
+
+ /* The transient detector has to be initialized also if the fast transient
+ detector was active, because the values from the transient detector
+ structure are used. */
if(FDKsbrEnc_InitSbrTransientDetector (&hEnv->sbrTransientDetector,
+ sbrConfigData->sbrSyntaxFlags,
sbrConfigData->frameSize,
sbrConfigData->sampleFreq,
params,
@@ -1658,6 +1754,8 @@ INT FDKsbrEnc_EnvInit (
/* other switches */
hSbrElement->sbrConfigData.useWaveCoding = params->useWaveCoding;
hSbrElement->sbrConfigData.useParametricCoding = params->parametricCoding;
+ hSbrElement->sbrConfigData.thresholdAmpResFF_m = params->threshold_AmpRes_FF_m;
+ hSbrElement->sbrConfigData.thresholdAmpResFF_e = params->threshold_AmpRes_FF_e;
/* init freq band table */
if(updateFreqBandTable(&hSbrElement->sbrConfigData,
@@ -1999,7 +2097,8 @@ INT sbrEncoder_Init(
*/
if ( ! FDKsbrEnc_InitializeSbrDefaults ( &sbrConfig[el],
*downSampleFactor,
- coreFrameLength
+ coreFrameLength,
+ IS_LOWDELAY(aot)
) )
{
error = 1;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-30 22:51:10 +0000