avfilter/asubprocess: use integer format

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

libavfilter/af_asubprocess.c

@@ -292,14 +292,10 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 
     short buffer[100000];
     int k = 0;
-    for (int i = 0; i < in->nb_samples; i++)
-      {
-        for (int j = 0; j < inlink->ch_layout.nb_channels; j++)
-          {
-            float **xd = (float **)in->extended_data;
-            buffer[k++] = xd[j][i]*32000;
-          }
-      }
+    int32_t *xd = (int32_t *)in->data[0];
+    for (k = 0; k < in->nb_samples * inlink->ch_layout.nb_channels; k++) {
+        buffer[k] = xd[k] >> 16;
+    }
     sp_write (s->sp, buffer, 2 * k);
     if (s->eof)
     {
@@ -352,14 +348,10 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
             }
             short buffer[100000]; // FIXME avail * inlink->ch_layout.nb_channels];
             sp_read (s->sp, buffer, avail * 2 * inlink->ch_layout.nb_channels);
-            int k = 0;
-            for (int i = 0; i < avail; i++)
+            int32_t *xd = (int32_t *)out->data[0];
+            for (int k = 0; k < avail * inlink->ch_layout.nb_channels; k++)
             {
-                for (int j = 0; j < inlink->ch_layout.nb_channels; j++)
-                {
-                    float **xd = (float **)out->extended_data;
-                    xd[j][i] = buffer[k++] * (1/32000.);
-                }
+                xd[k] = buffer[k] << 16;
             }
             ret = ff_filter_frame(outlink, out);
         }
@@ -468,6 +460,6 @@ const AVFilter ff_af_asubprocess = {
     .activate      = activate,
     FILTER_INPUTS(asubprocess_inputs),
     FILTER_OUTPUTS(ff_audio_default_filterpad),
-    FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_FLTP),
+    FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_S32),
     .process_command = process_command,
 };