shithub: aacenc

Info  •  Files  •  Log  •  Branches

block switching parametrized: more long blocks at lower bitrates, more short blocks at higher bitrates

--- a/libfaac/aacquant.c

+++ b/libfaac/aacquant.c

@@ -101,7 +101,7 @@

     for (sb = 0; sb < coderInfo->nr_of_sfb; sb++)

         scale_factor[sb] = 0;

-    if (BlocQuant(coderInfo, xr, xi, (double)aacquantCfg->quality/100, aacquantCfg->pow43))

+    if (BlocQuant(coderInfo, xr, xi, (double)aacquantCfg->quality/DEFQUAL, aacquantCfg->pow43))

     {

         UpdateRequant(coderInfo, xi, aacquantCfg->pow43);

--- a/libfaac/aacquant.h

+++ b/libfaac/aacquant.h

@@ -44,6 +44,8 @@

   } AACQuantCfg;

 #pragma pack(pop)

+enum {DEFQUAL = 100, MAXQUAL = 2000, MINQUAL = 10};

+

 void AACQuantizeInit(CoderInfo *coderInfo, unsigned int numChannels,

 		     AACQuantCfg *aacquantCfg);

 void AACQuantizeEnd(CoderInfo *coderInfo, unsigned int numChannels,

--- a/libfaac/blockswitch.c

+++ b/libfaac/blockswitch.c

@@ -62,12 +62,12 @@

   }

 }

-static void PsyCheckShort(PsyInfo * psyInfo)

+static void PsyCheckShort(PsyInfo * psyInfo, double quality)

 {

   enum {PREVS = 2, NEXTS = 2};

   psydata_t *psydata = psyInfo->data;

   int lastband = psydata->lastband;

-  int firstband = 1;

+  int firstband = 2;

   int sfb, win;

   psyfloat *lasteng;

@@ -96,7 +96,7 @@

               volchg += fabs(eng[sfb] - lasteng[sfb]);

           }

-          if ((volchg / toteng) > 1.5)

+          if ((volchg / toteng * quality) > 2.5)

           {

               psyInfo->block_type = ONLY_SHORT_WINDOW;

               break;

@@ -227,7 +227,9 @@

 static void PsyCalculate(ChannelInfo * channelInfo, GlobalPsyInfo * gpsyInfo,

 			 PsyInfo * psyInfo, int *cb_width_long, int

 			 num_cb_long, int *cb_width_short,

-			 int num_cb_short, unsigned int numChannels)

+			 int num_cb_short, unsigned int numChannels,

+			 double quality

+			)

 {

   unsigned int channel;

@@ -243,8 +245,8 @@

 	int leftChan = channel;

 	int rightChan = channelInfo[channel].paired_ch;

-	PsyCheckShort(&psyInfo[leftChan]);

-	PsyCheckShort(&psyInfo[rightChan]);

+	PsyCheckShort(&psyInfo[leftChan], quality);

+	PsyCheckShort(&psyInfo[rightChan], quality);

       }

       else if (!channelInfo[channel].cpe &&

 	       channelInfo[channel].lfe)

@@ -254,7 +256,7 @@

       }

       else if (!channelInfo[channel].cpe)

       {				/* SCE */

-	PsyCheckShort(&psyInfo[channel]);

+	PsyCheckShort(&psyInfo[channel], quality);

       }

     }

   }

--- a/libfaac/blockswitch.h

+++ b/libfaac/blockswitch.h

@@ -67,7 +67,7 @@

 void (*PsyCalculate) (ChannelInfo *channelInfo, GlobalPsyInfo *gpsyInfo,

 		PsyInfo *psyInfo, int *cb_width_long, int num_cb_long,

 		int *cb_width_short, int num_cb_short,

-		unsigned int numChannels);

+		unsigned int numChannels, double quality);

 void (*PsyBufferUpdate) ( FFT_Tables *fft_tables, GlobalPsyInfo * gpsyInfo, PsyInfo * psyInfo,

 		double *newSamples, unsigned int bandwidth,

 		int *cb_width_short, int num_cb_short);

--- a/libfaac/frame.c

+++ b/libfaac/frame.c

@@ -66,7 +66,6 @@

 // default bandwidth/samplerate ratio

 static const double bwfac = 0.42;

-enum {MAXQUAL = 2000, MINQUAL = 10};

 int FAACAPI faacEncGetVersion( char **faac_id_string,

 			      				char **faac_copyright_string)

@@ -324,7 +323,7 @@

     hEncoder->config.useTns = 0;

     hEncoder->config.bitRate = 0; /* default bitrate / channel */

     hEncoder->config.bandWidth = bwfac * hEncoder->sampleRate;

-    hEncoder->config.quantqual = 100;

+    hEncoder->config.quantqual = DEFQUAL;

     hEncoder->config.psymodellist = (psymodellist_t *)psymodellist;

     hEncoder->config.psymodelidx = 0;

     hEncoder->psymodel =

@@ -590,7 +589,7 @@

     hEncoder->psymodel->PsyCalculate(channelInfo, &hEncoder->gpsyInfo, hEncoder->psyInfo,

         hEncoder->srInfo->cb_width_long, hEncoder->srInfo->num_cb_long,

         hEncoder->srInfo->cb_width_short,

-        hEncoder->srInfo->num_cb_short, numChannels);

+        hEncoder->srInfo->num_cb_short, numChannels, (double)hEncoder->aacquantCfg.quality / DEFQUAL);

     hEncoder->psymodel->BlockSwitch(coderInfo, hEncoder->psyInfo, numChannels);