dcadsp: Add a new method, qmf_32_subbands

This does most of the work formerly carried out by
the static function qmf_32_subbands() in dcadec.c.
Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/dcadec.c

@@ -946,10 +946,8 @@ static void qmf_32_subbands(DCAContext *s, int chans,
                             float scale)
 {
     const float *prCoeff;
-    int i;
 
     int sb_act = s->subband_activity[chans];
-    int subindex;
 
     scale *= sqrt(1 / 8.0);
 
@@ -959,25 +957,11 @@ static void qmf_32_subbands(DCAContext *s, int chans,
     else                        /* Perfect reconstruction */
         prCoeff = fir_32bands_perfect;
 
-    for (i = sb_act; i < 32; i++)
-        s->raXin[i] = 0.0;
-
-    /* Reconstructed channel sample index */
-    for (subindex = 0; subindex < 8; subindex++) {
-        /* Load in one sample from each subband and clear inactive subbands */
-        for (i = 0; i < sb_act; i++) {
-            unsigned sign = (i - 1) & 2;
-            uint32_t v    = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30;
-            AV_WN32A(&s->raXin[i], v);
-        }
-
-        s->synth.synth_filter_float(&s->imdct,
+    s->dcadsp.qmf_32_subbands(samples_in, sb_act, &s->synth, &s->imdct,
                               s->subband_fir_hist[chans],
                               &s->hist_index[chans],
                               s->subband_fir_noidea[chans], prCoeff,
                               samples_out, s->raXin, scale);
-        samples_out += 32;
-    }
 }
 
 static void lfe_interpolation_fir(DCAContext *s, int decimation_select,

libavcodec/dcadsp.c

@@ -21,6 +21,7 @@
 
 #include "config.h"
 #include "libavutil/attributes.h"
+#include "libavutil/intreadwrite.h"
 #include "dcadsp.h"
 
 static void dca_lfe_fir_c(float *out, const float *in, const float *coefs,
@@ -45,8 +46,37 @@ static void dca_lfe_fir_c(float *out, const float *in, const float *coefs,
     }
 }
 
+static void dca_qmf_32_subbands(float samples_in[32][8], int sb_act,
+                                SynthFilterContext *synth, FFTContext *imdct,
+                                float synth_buf_ptr[512],
+                                int *synth_buf_offset, float synth_buf2[32],
+                                const float window[512], float *samples_out,
+                                float raXin[32], float scale)
+{
+    int i;
+    int subindex;
+
+    for (i = sb_act; i < 32; i++)
+        raXin[i] = 0.0;
+
+    /* Reconstructed channel sample index */
+    for (subindex = 0; subindex < 8; subindex++) {
+        /* Load in one sample from each subband and clear inactive subbands */
+        for (i = 0; i < sb_act; i++) {
+            unsigned sign = (i - 1) & 2;
+            uint32_t v    = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30;
+            AV_WN32A(&raXin[i], v);
+        }
+
+        synth->synth_filter_float(imdct, synth_buf_ptr, synth_buf_offset,
+                                  synth_buf2, window, samples_out, raXin, scale);
+        samples_out += 32;
+    }
+}
+
 av_cold void ff_dcadsp_init(DCADSPContext *s)
 {
     s->lfe_fir = dca_lfe_fir_c;
+    s->qmf_32_subbands = dca_qmf_32_subbands;
     if (ARCH_ARM) ff_dcadsp_init_arm(s);
 }

libavcodec/dcadsp.h

@@ -19,9 +19,18 @@
 #ifndef AVCODEC_DCADSP_H
 #define AVCODEC_DCADSP_H
 
+#include "avfft.h"
+#include "synth_filter.h"
+
 typedef struct DCADSPContext {
     void (*lfe_fir)(float *out, const float *in, const float *coefs,
                     int decifactor, float scale);
+    void (*qmf_32_subbands)(float samples_in[32][8], int sb_act,
+                            SynthFilterContext *synth, FFTContext *imdct,
+                            float synth_buf_ptr[512],
+                            int *synth_buf_offset, float synth_buf2[32],
+                            const float window[512], float *samples_out,
+                            float raXin[32], float scale);
 } DCADSPContext;
 
 void ff_dcadsp_init(DCADSPContext *s);