aaccoder: move the quantization functions to a separate file

This commit moves the quantizer to a separate header file.
This allows the quantizer to be used from a separate files outside
of aaccoder without having to put another function pointer and will
result in a slight speedup as the compiler can do more optimizations.

This is required for commits following.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

libavcodec/aac.h

@@ -254,6 +254,7 @@ typedef struct SingleChannelElement {
     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
+    DECLARE_ALIGNED(32, AAC_FLOAT, pqcoeffs)[1024]; ///< quantization error of coefs (used by encoder)
     PredictorState predictor_state[MAX_PREDICTORS];
     INTFLOAT *ret;                                  ///< PCM output
 } SingleChannelElement;

libavcodec/aacenc.c

@@ -355,11 +355,14 @@ static void encode_spectral_coeffs(AACEncContext *s, SingleChannelElement *sce)
                 continue;
             }
             for (w2 = w; w2 < w + sce->ics.group_len[w]; w2++)
-                s->coder->quantize_and_encode_band(s, &s->pb, sce->coeffs + start + w2*128,
+                s->coder->quantize_and_encode_band(s, &s->pb,
+                                                   &sce->coeffs[start + w2*128],
+                                                   &sce->pqcoeffs[start + w2*128],
                                                    sce->ics.swb_sizes[i],
                                                    sce->sf_idx[w*16 + i],
                                                    sce->band_type[w*16 + i],
-                                                   s->lambda, sce->ics.window_clipping[w]);
+                                                   s->lambda,
+                                                   sce->ics.window_clipping[w]);
             start += sce->ics.swb_sizes[i];
         }
     }

libavcodec/aacenc.h

@@ -55,7 +55,7 @@ typedef struct AACCoefficientsEncoder {
                                   SingleChannelElement *sce, const float lambda);
     void (*encode_window_bands_info)(struct AACEncContext *s, SingleChannelElement *sce,
                                      int win, int group_len, const float lambda);
-    void (*quantize_and_encode_band)(struct AACEncContext *s, PutBitContext *pb, const float *in, int size,
+    void (*quantize_and_encode_band)(struct AACEncContext *s, PutBitContext *pb, const float *in, float *out, int size,
                                      int scale_idx, int cb, const float lambda, int rtz);
     void (*set_special_band_scalefactors)(struct AACEncContext *s, SingleChannelElement *sce);
     void (*search_for_pns)(struct AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce);