swr: support float & int32 in the resampler

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 113 insertions, 0 deletions

diff --git a/libswresample/resample_template.c b/libswresample/resample_template.c
new file mode 100644
index 0000000000..5d49374357
--- /dev/null
+++ b/libswresample/resample_template.c
@@ -0,0 +1,113 @@
+/*
+ * audio resampling
+ * Copyright (c) 2004-2012 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * audio resampling
+ * @author Michael Niedermayer <michaelni@gmx.at>
+ */
+
+int RENAME(swri_resample)(ResampleContext *c, DELEM *dst, const DELEM *src, int *consumed, int src_size, int dst_size, int update_ctx){
+    int dst_index, i;
+    int index= c->index;
+    int frac= c->frac;
+    int dst_incr_frac= c->dst_incr % c->src_incr;
+    int dst_incr=      c->dst_incr / c->src_incr;
+    int compensation_distance= c->compensation_distance;
+
+    av_assert1(c->filter_shift == FILTER_SHIFT);
+    av_assert1(c->felem_size == sizeof(FELEM));
+
+    if(compensation_distance == 0 && c->filter_length == 1 && c->phase_shift==0){
+        int64_t index2= ((int64_t)index)<<32;
+        int64_t incr= (1LL<<32) * c->dst_incr / c->src_incr;
+        dst_size= FFMIN(dst_size, (src_size-1-index) * (int64_t)c->src_incr / c->dst_incr);
+
+        for(dst_index=0; dst_index < dst_size; dst_index++){
+            dst[dst_index] = src[index2>>32];
+            index2 += incr;
+        }
+        index += dst_index * dst_incr;
+        index += (frac + dst_index * (int64_t)dst_incr_frac) / c->src_incr;
+        frac   = (frac + dst_index * (int64_t)dst_incr_frac) % c->src_incr;
+    }else{
+        for(dst_index=0; dst_index < dst_size; dst_index++){
+            FELEM *filter= ((FELEM*)c->filter_bank) + c->filter_length*(index & c->phase_mask);
+            int sample_index= index >> c->phase_shift;
+            FELEM2 val=0;
+
+            if(sample_index + c->filter_length > src_size || -sample_index >= src_size){
+                break;
+            }else if(sample_index < 0){
+                for(i=0; i<c->filter_length; i++)
+                    val += src[FFABS(sample_index + i)] * filter[i];
+            }else if(c->linear){
+                FELEM2 v2=0;
+                for(i=0; i<c->filter_length; i++){
+                    val += src[sample_index + i] * (FELEM2)filter[i];
+                    v2  += src[sample_index + i] * (FELEM2)filter[i + c->filter_length];
+                }
+                val+=(v2-val)*(FELEML)frac / c->src_incr;
+            }else{
+                for(i=0; i<c->filter_length; i++){
+                    val += src[sample_index + i] * (FELEM2)filter[i];
+                }
+            }
+
+            OUT(dst[dst_index], val);
+
+            frac += dst_incr_frac;
+            index += dst_incr;
+            if(frac >= c->src_incr){
+                frac -= c->src_incr;
+                index++;
+            }
+
+            if(dst_index + 1 == compensation_distance){
+                compensation_distance= 0;
+                dst_incr_frac= c->ideal_dst_incr % c->src_incr;
+                dst_incr=      c->ideal_dst_incr / c->src_incr;
+            }
+        }
+    }
+    *consumed= FFMAX(index, 0) >> c->phase_shift;
+    if(index>=0) index &= c->phase_mask;
+
+    if(compensation_distance){
+        compensation_distance -= dst_index;
+        assert(compensation_distance > 0);
+    }
+    if(update_ctx){
+        c->frac= frac;
+        c->index= index;
+        c->dst_incr= dst_incr_frac + c->src_incr*dst_incr;
+        c->compensation_distance= compensation_distance;
+    }
+#if 0
+    if(update_ctx && !c->compensation_distance){
+#undef rand
+        av_resample_compensate(c, rand() % (8000*2) - 8000, 8000*2);
+av_log(NULL, AV_LOG_DEBUG, "%d %d %d\n", c->dst_incr, c->ideal_dst_incr, c->compensation_distance);
+    }
+#endif
+
+    return dst_index;
+}