libavcodec: Implementation of AAC_fixed_decoder (LC-module) [3/4]

Add fixed point implementation
Signed-off-by: Nedeljko Babic <nedeljko.babic@imgtec.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/aac.h

@@ -41,21 +41,53 @@
 #define FFT_FLOAT    0
 #define FFT_FIXED_32 1
 
+#define AAC_RENAME(x)       x ## _fixed
+#define AAC_RENAME_32(x)    x ## _fixed_32
+#define AAC_FLOAT SoftFloat
+#define INTFLOAT int
+#define SHORTFLOAT int16_t
+#define AAC_SIGNE           int
+#define FIXR(a)             ((int)((a) * 1 + 0.5))
+#define FIXR10(a)           ((int)((a) * 1024.0 + 0.5))
+#define Q23(a)              (int)((a) * 8388608.0 + 0.5)
 #define Q30(x)              (int)((x)*1073741824.0 + 0.5)
 #define Q31(x)              (int)((x)*2147483648.0 + 0.5)
+#define RANGE15(x)          x
+#define GET_GAIN(x, y)      (-(y) << (x)) + 1024
+#define AAC_MUL26(x, y)     (int)(((int64_t)(x) * (y) + 0x2000000) >> 26)
+#define AAC_MUL30(x, y)     (int)(((int64_t)(x) * (y) + 0x20000000) >> 30)
+#define AAC_MUL31(x, y)     (int)(((int64_t)(x) * (y) + 0x40000000) >> 31)
 
 #else
 
 #define FFT_FLOAT    1
 #define FFT_FIXED_32 0
 
+#define AAC_RENAME(x)       x
+#define AAC_RENAME_32(x)    x
+#define AAC_FLOAT float
+#define INTFLOAT float
+#define SHORTFLOAT float
+#define AAC_SIGNE           unsigned
+#define FIXR(x)             ((float)(x))
+#define FIXR10(x)           ((float)(x))
+#define Q23(x)              x
 #define Q30(x)              x
 #define Q31(x)              x
+#define RANGE15(x)          (32768.0 * (x))
+#define GET_GAIN(x, y)      powf((x), -(y))
+#define AAC_MUL26(x, y)     ((x) * (y))
+#define AAC_MUL30(x, y)     ((x) * (y))
+#define AAC_MUL31(x, y)     ((x) * (y))
+
 #endif /* USE_FIXED */
 
 #include "libavutil/float_dsp.h"
+#include "libavutil/fixed_dsp.h"
 #include "avcodec.h"
+#if !USE_FIXED
 #include "imdct15.h"
+#endif
 #include "fft.h"
 #include "mpeg4audio.h"
 #include "sbr.h"
@@ -149,12 +181,12 @@ typedef struct OutputConfiguration {
  * Predictor State
  */
 typedef struct PredictorState {
-    float cor0;
-    float cor1;
-    float var0;
-    float var1;
-    float r0;
-    float r1;
+    AAC_FLOAT cor0;
+    AAC_FLOAT cor1;
+    AAC_FLOAT var0;
+    AAC_FLOAT var1;
+    AAC_FLOAT r0;
+    AAC_FLOAT r1;
 } PredictorState;
 
 #define MAX_PREDICTORS 672
@@ -175,7 +207,7 @@ typedef struct PredictorState {
 typedef struct LongTermPrediction {
     int8_t present;
     int16_t lag;
-    float coef;
+    INTFLOAT coef;
     int8_t used[MAX_LTP_LONG_SFB];
 } LongTermPrediction;
 
@@ -209,7 +241,7 @@ typedef struct TemporalNoiseShaping {
     int length[8][4];
     int direction[8][4];
     int order[8][4];
-    float coef[8][4][TNS_MAX_ORDER];
+    INTFLOAT coef[8][4][TNS_MAX_ORDER];
 } TemporalNoiseShaping;
 
 /**
@@ -246,7 +278,7 @@ typedef struct ChannelCoupling {
     int ch_select[8];      /**< [0] shared list of gains; [1] list of gains for right channel;
                             *   [2] list of gains for left channel; [3] lists of gains for both channels
                             */
-    float gain[16][120];
+    INTFLOAT gain[16][120];
 } ChannelCoupling;
 
 /**
@@ -258,18 +290,18 @@ typedef struct SingleChannelElement {
     Pulse pulse;
     enum BandType band_type[128];                   ///< band types
     int band_type_run_end[120];                     ///< band type run end points
-    float sf[120];                                  ///< scalefactors
+    INTFLOAT sf[120];                               ///< scalefactors
     int sf_idx[128];                                ///< scalefactor indices (used by encoder)
     uint8_t zeroes[128];                            ///< band is not coded (used by encoder)
     float  is_ener[128];                            ///< Intensity stereo pos (used by encoder)
     float pns_ener[128];                            ///< Noise energy values (used by encoder)
-    DECLARE_ALIGNED(32, float,   pcoeffs)[1024];    ///< coefficients for IMDCT, pristine
-    DECLARE_ALIGNED(32, float,   coeffs)[1024];     ///< coefficients for IMDCT, maybe processed
-    DECLARE_ALIGNED(32, float,   saved)[1536];      ///< overlap
-    DECLARE_ALIGNED(32, float,   ret_buf)[2048];    ///< PCM output buffer
-    DECLARE_ALIGNED(16, float,   ltp_state)[3072];  ///< time signal for LTP
+    DECLARE_ALIGNED(32, INTFLOAT, pcoeffs)[1024];   ///< coefficients for IMDCT, pristine
+    DECLARE_ALIGNED(32, INTFLOAT, coeffs)[1024];    ///< coefficients for IMDCT, maybe processed
+    DECLARE_ALIGNED(32, INTFLOAT, saved)[1536];     ///< overlap
+    DECLARE_ALIGNED(32, INTFLOAT, ret_buf)[2048];   ///< PCM output buffer
+    DECLARE_ALIGNED(16, INTFLOAT, ltp_state)[3072]; ///< time signal for LTP
     PredictorState predictor_state[MAX_PREDICTORS];
-    float *ret;                                     ///< PCM output
+    INTFLOAT *ret;                                  ///< PCM output
 } SingleChannelElement;
 
 /**
@@ -316,7 +348,7 @@ struct AACContext {
      * (We do not want to have these on the stack.)
      * @{
      */
-    DECLARE_ALIGNED(32, float, buf_mdct)[1024];
+    DECLARE_ALIGNED(32, INTFLOAT, buf_mdct)[1024];
     /** @} */
 
     /**
@@ -327,8 +359,12 @@ struct AACContext {
     FFTContext mdct_small;
     FFTContext mdct_ld;
     FFTContext mdct_ltp;
+#if USE_FIXED
+    AVFixedDSPContext *fdsp;
+#else
     IMDCT15Context *mdct480;
     AVFloatDSPContext *fdsp;
+#endif /* USE_FIXED */
     int random_state;
     /** @} */
 
@@ -348,7 +384,7 @@ struct AACContext {
     int dmono_mode;      ///< 0->not dmono, 1->use first channel, 2->use second channel
     /** @} */
 
-    DECLARE_ALIGNED(32, float, temp)[128];
+    DECLARE_ALIGNED(32, INTFLOAT, temp)[128];
 
     OutputConfiguration oc[2];
     int warned_num_aac_frames;
@@ -356,11 +392,13 @@ struct AACContext {
     /* aacdec functions pointers */
     void (*imdct_and_windowing)(AACContext *ac, SingleChannelElement *sce);
     void (*apply_ltp)(AACContext *ac, SingleChannelElement *sce);
-    void (*apply_tns)(float coef[1024], TemporalNoiseShaping *tns,
+    void (*apply_tns)(INTFLOAT coef[1024], TemporalNoiseShaping *tns,
                       IndividualChannelStream *ics, int decode);
-    void (*windowing_and_mdct_ltp)(AACContext *ac, float *out,
-                                   float *in, IndividualChannelStream *ics);
+    void (*windowing_and_mdct_ltp)(AACContext *ac, INTFLOAT *out,
+                                   INTFLOAT *in, IndividualChannelStream *ics);
     void (*update_ltp)(AACContext *ac, SingleChannelElement *sce);
+    void (*vector_pow43)(int *coefs, int len);
+    void (*subband_scale)(int *dst, int *src, int scale, int offset, int len);
 
 };
 

libavcodec/aacdec.c

@@ -32,6 +32,11 @@
  * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
  */
 
+#define FFT_FLOAT 1
+#define FFT_FIXED_32 0
+#define USE_FIXED 0
+#define CONFIG_FIXED 0
+
 #include "libavutil/float_dsp.h"
 #include "libavutil/opt.h"
 #include "avcodec.h"

libavcodec/mdct_template.c

@@ -81,8 +81,13 @@ av_cold int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale)
     scale = sqrt(fabs(scale));
     for(i=0;i<n4;i++) {
         alpha = 2 * M_PI * (i + theta) / n;
+#if FFT_FIXED_32
+        s->tcos[i*tstep] = (FFTSample)floor(-cos(alpha) * 2147483648.0 + 0.5);
+        s->tsin[i*tstep] = (FFTSample)floor(-sin(alpha) * 2147483648.0 + 0.5);
+#else
         s->tcos[i*tstep] = FIX15(-cos(alpha) * scale);
         s->tsin[i*tstep] = FIX15(-sin(alpha) * scale);
+#endif
     }
     return 0;
  fail: