avcodec/cfhdenc: refactor DSP code for CFHD encoder

This is needed to implement x86 SIMD.

4 files changed, 151 insertions, 91 deletions

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 431e05b642..6dda8cbb1f 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -258,7 +258,7 @@ OBJS-$(CONFIG_CDGRAPHICS_DECODER)      += cdgraphics.o
 OBJS-$(CONFIG_CDTOONS_DECODER)         += cdtoons.o
 OBJS-$(CONFIG_CDXL_DECODER)            += cdxl.o
 OBJS-$(CONFIG_CFHD_DECODER)            += cfhd.o cfhddata.o cfhddsp.o
-OBJS-$(CONFIG_CFHD_ENCODER)            += cfhdenc.o cfhddata.o
+OBJS-$(CONFIG_CFHD_ENCODER)            += cfhdenc.o cfhddata.o cfhdencdsp.o
 OBJS-$(CONFIG_CINEPAK_DECODER)         += cinepak.o
 OBJS-$(CONFIG_CINEPAK_ENCODER)         += cinepakenc.o elbg.o
 OBJS-$(CONFIG_CLEARVIDEO_DECODER)      += clearvideo.o
diff --git a/libavcodec/cfhdenc.c b/libavcodec/cfhdenc.c
index 7b6b3c92f2..370b1e5063 100644
--- a/libavcodec/cfhdenc.c
+++ b/libavcodec/cfhdenc.c
@@ -33,6 +33,7 @@
 #include "avcodec.h"
 #include "bytestream.h"
 #include "cfhd.h"
+#include "cfhdencdsp.h"
 #include "put_bits.h"
 #include "internal.h"
 #include "thread.h"
@@ -239,6 +240,8 @@ typedef struct CFHDEncContext {
     Runbook  rb[321];
     Codebook cb[513];
     int16_t *alpha;
+
+    CFHDEncDSPContext dsp;
 } CFHDEncContext;
 
 static av_cold int cfhd_encode_init(AVCodecContext *avctx)
@@ -359,6 +362,8 @@ static av_cold int cfhd_encode_init(AVCodecContext *avctx)
             s->lut[i] = last;
     }
 
+    ff_cfhdencdsp_init(&s->dsp);
+
     if (s->planes != 4)
         return 0;
 
@@ -369,42 +374,6 @@ static av_cold int cfhd_encode_init(AVCodecContext *avctx)
     return 0;
 }
 
-static av_always_inline void filter(int16_t *input, ptrdiff_t in_stride,
-                          int16_t *low, ptrdiff_t low_stride,
-                          int16_t *high, ptrdiff_t high_stride,
-                          int len)
-{
-    low[(0>>1) * low_stride]   = av_clip_int16(input[0*in_stride] + input[1*in_stride]);
-    high[(0>>1) * high_stride] = av_clip_int16((5 * input[0*in_stride] - 11 * input[1*in_stride] +
-                                                4 * input[2*in_stride] +  4 * input[3*in_stride] -
-                                                1 * input[4*in_stride] -  1 * input[5*in_stride] + 4) >> 3);
-
-    for (int i = 2; i < len - 2; i += 2) {
-        low[(i>>1) * low_stride]   = av_clip_int16(input[i*in_stride] + input[(i+1)*in_stride]);
-        high[(i>>1) * high_stride] = av_clip_int16(((-input[(i-2)*in_stride] - input[(i-1)*in_stride] +
-                                                      input[(i+2)*in_stride] + input[(i+3)*in_stride] + 4) >> 3) +
-                                                      input[(i+0)*in_stride] - input[(i+1)*in_stride]);
-    }
-
-    low[((len-2)>>1) * low_stride]   = av_clip_int16(input[((len-2)+0)*in_stride] + input[((len-2)+1)*in_stride]);
-    high[((len-2)>>1) * high_stride] = av_clip_int16((11* input[((len-2)+0)*in_stride] - 5 * input[((len-2)+1)*in_stride] -
-                                                      4 * input[((len-2)-1)*in_stride] - 4 * input[((len-2)-2)*in_stride] +
-                                                      1 * input[((len-2)-3)*in_stride] + 1 * input[((len-2)-4)*in_stride] + 4) >> 3);
-}
-
-static void horiz_filter(int16_t *input, int16_t *low, int16_t *high,
-                         int width)
-{
-    filter(input, 1, low, 1, high, 1, width);
-}
-
-static void vert_filter(int16_t *input, ptrdiff_t in_stride,
-                        int16_t *low, ptrdiff_t low_stride,
-                        int16_t *high, ptrdiff_t high_stride, int len)
-{
-    filter(input, in_stride, low, low_stride, high, high_stride, len);
-}
-
 static void quantize_band(int16_t *input, int width, int a_width,
                           int height, unsigned quantization)
 {
@@ -454,6 +423,7 @@ static int cfhd_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                              const AVFrame *frame, int *got_packet)
 {
     CFHDEncContext *s = avctx->priv_data;
+    CFHDEncDSPContext *dsp = &s->dsp;
     PutByteContext *pby = &s->pby;
     PutBitContext *pb = &s->pb;
     const Codebook *const cb = s->cb;
@@ -480,12 +450,9 @@ static int cfhd_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
             in_stride = avctx->width;
         }
 
-        for (int i = 0; i < height * 2; i++) {
-            horiz_filter(input, low, high, width * 2);
-            input += in_stride;
-            low += a_width;
-            high += a_width;
-        }
+        dsp->horiz_filter(input, low, high,
+                          in_stride, a_width, a_width,
+                          width * 2, height * 2);
 
         input = s->plane[plane].l_h[7];
         low = s->plane[plane].subband[7];
@@ -493,23 +460,17 @@ static int cfhd_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
         high = s->plane[plane].subband[9];
         high_stride = s->plane[plane].band[2][0].a_width;
 
-        for (int i = 0; i < width; i++) {
-            vert_filter(input, a_width, low, low_stride, high, high_stride, height * 2);
-            input++;
-            low++;
-            high++;
-        }
+        dsp->vert_filter(input, low, high,
+                         a_width, low_stride, high_stride,
+                         width, height * 2);
 
         input = s->plane[plane].l_h[6];
         low = s->plane[plane].l_h[7];
         high = s->plane[plane].subband[8];
 
-        for (int i = 0; i < width; i++) {
-            vert_filter(input, a_width, low, low_stride, high, high_stride, height * 2);
-            input++;
-            low++;
-            high++;
-        }
+        dsp->vert_filter(input, low, high,
+                         a_width, low_stride, high_stride,
+                         width, height * 2);
 
         a_width = s->plane[plane].band[1][0].a_width;
         width = s->plane[plane].band[1][0].width;
@@ -527,34 +488,25 @@ static int cfhd_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
         }
 
         input = s->plane[plane].l_h[7];
-        for (int i = 0; i < height * 2; i++) {
-            horiz_filter(input, low, high, width * 2);
-            input += a_width * 2;
-            low += low_stride;
-            high += high_stride;
-        }
+        dsp->horiz_filter(input, low, high,
+                          a_width * 2, low_stride, high_stride,
+                          width * 2, height * 2);
 
         input = s->plane[plane].l_h[4];
         low = s->plane[plane].subband[4];
         high = s->plane[plane].subband[6];
 
-        for (int i = 0; i < width; i++) {
-            vert_filter(input, a_width, low, low_stride, high, high_stride, height * 2);
-            input++;
-            low++;
-            high++;
-        }
+        dsp->vert_filter(input, low, high,
+                         a_width, low_stride, high_stride,
+                         width, height * 2);
 
         input = s->plane[plane].l_h[3];
         low = s->plane[plane].l_h[4];
         high = s->plane[plane].subband[5];
 
-        for (int i = 0; i < width; i++) {
-            vert_filter(input, a_width, low, low_stride, high, high_stride, height * 2);
-            input++;
-            low++;
-            high++;
-        }
+        dsp->vert_filter(input, low, high,
+                         a_width, low_stride, high_stride,
+                         width, height * 2);
 
         a_width = s->plane[plane].band[0][0].a_width;
         width = s->plane[plane].band[0][0].width;
@@ -574,34 +526,25 @@ static int cfhd_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
         }
 
         input = s->plane[plane].l_h[4];
-        for (int i = 0; i < height * 2; i++) {
-            horiz_filter(input, low, high, width * 2);
-            input += a_width * 2;
-            low += low_stride;
-            high += high_stride;
-        }
+        dsp->horiz_filter(input, low, high,
+                          a_width * 2, low_stride, high_stride,
+                          width * 2, height * 2);
 
         low = s->plane[plane].subband[1];
         high = s->plane[plane].subband[3];
         input = s->plane[plane].l_h[1];
 
-        for (int i = 0; i < width; i++) {
-            vert_filter(input, a_width, low, low_stride, high, high_stride, height * 2);
-            input++;
-            low++;
-            high++;
-        }
+        dsp->vert_filter(input, low, high,
+                         a_width, low_stride, high_stride,
+                         width, height * 2);
 
         low = s->plane[plane].subband[0];
         high = s->plane[plane].subband[2];
         input = s->plane[plane].l_h[0];
 
-        for (int i = 0; i < width; i++) {
-            vert_filter(input, a_width, low, low_stride, high, high_stride, height * 2);
-            input++;
-            low++;
-            high++;
-        }
+        dsp->vert_filter(input, low, high,
+                         a_width, low_stride, high_stride,
+                         width, height * 2);
     }
 
     ret = ff_alloc_packet2(avctx, pkt, 64LL + s->planes * (2LL * avctx->width * avctx->height + 1000LL), 0);
diff --git a/libavcodec/cfhdencdsp.c b/libavcodec/cfhdencdsp.c
new file mode 100644
index 0000000000..0becb76d1d
--- /dev/null
+++ b/libavcodec/cfhdencdsp.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2015-2016 Kieran Kunhya <kieran@kunhya.com>
+ *
+ * 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
+ */
+
+#include "libavutil/attributes.h"
+#include "libavutil/common.h"
+#include "libavutil/avassert.h"
+
+#include "cfhdencdsp.h"
+
+static av_always_inline void filter(int16_t *input, ptrdiff_t in_stride,
+                          int16_t *low, ptrdiff_t low_stride,
+                          int16_t *high, ptrdiff_t high_stride,
+                          int len)
+{
+    low[(0>>1) * low_stride]   = av_clip_int16(input[0*in_stride] + input[1*in_stride]);
+    high[(0>>1) * high_stride] = av_clip_int16((5 * input[0*in_stride] - 11 * input[1*in_stride] +
+                                                4 * input[2*in_stride] +  4 * input[3*in_stride] -
+                                                1 * input[4*in_stride] -  1 * input[5*in_stride] + 4) >> 3);
+
+    for (int i = 2; i < len - 2; i += 2) {
+        low[(i>>1) * low_stride]   = av_clip_int16(input[i*in_stride] + input[(i+1)*in_stride]);
+        high[(i>>1) * high_stride] = av_clip_int16(((-input[(i-2)*in_stride] - input[(i-1)*in_stride] +
+                                                      input[(i+2)*in_stride] + input[(i+3)*in_stride] + 4) >> 3) +
+                                                      input[(i+0)*in_stride] - input[(i+1)*in_stride]);
+    }
+
+    low[((len-2)>>1) * low_stride]   = av_clip_int16(input[((len-2)+0)*in_stride] + input[((len-2)+1)*in_stride]);
+    high[((len-2)>>1) * high_stride] = av_clip_int16((11* input[((len-2)+0)*in_stride] - 5 * input[((len-2)+1)*in_stride] -
+                                                      4 * input[((len-2)-1)*in_stride] - 4 * input[((len-2)-2)*in_stride] +
+                                                      1 * input[((len-2)-3)*in_stride] + 1 * input[((len-2)-4)*in_stride] + 4) >> 3);
+}
+
+static void horiz_filter(int16_t *input, int16_t *low, int16_t *high,
+                         ptrdiff_t in_stride, ptrdiff_t low_stride,
+                         ptrdiff_t high_stride,
+                         int width, int height)
+{
+    for (int i = 0; i < height; i++) {
+        filter(input, 1, low, 1, high, 1, width);
+        input += in_stride;
+        low += low_stride;
+        high += high_stride;
+    }
+}
+
+static void vert_filter(int16_t *input, int16_t *low, int16_t *high,
+                        ptrdiff_t in_stride, ptrdiff_t low_stride,
+                        ptrdiff_t high_stride,
+                        int width, int height)
+{
+    for (int i = 0; i < width; i++)
+        filter(&input[i], in_stride, &low[i], low_stride, &high[i], high_stride, height);
+}
+
+av_cold void ff_cfhdencdsp_init(CFHDEncDSPContext *c)
+{
+    c->horiz_filter = horiz_filter;
+    c->vert_filter = vert_filter;
+}
diff --git a/libavcodec/cfhdencdsp.h b/libavcodec/cfhdencdsp.h
new file mode 100644
index 0000000000..b3aac8d0a7
--- /dev/null
+++ b/libavcodec/cfhdencdsp.h
@@ -0,0 +1,41 @@
+/*
+ * 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
+ */
+
+#ifndef AVCODEC_CFHDENCDSP_H
+#define AVCODEC_CFHDENCDSP_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+typedef struct CFHDEncDSPContext {
+    void (*horiz_filter)(int16_t *input, int16_t *low, int16_t *high,
+                         ptrdiff_t in_stride, ptrdiff_t low_stride,
+                         ptrdiff_t high_stride,
+                         int width, int height);
+
+    void (*vert_filter)(int16_t *input, int16_t *low, int16_t *high,
+                        ptrdiff_t in_stride, ptrdiff_t low_stride,
+                        ptrdiff_t high_stride,
+                        int width, int height);
+} CFHDEncDSPContext;
+
+void ff_cfhdencdsp_init(CFHDEncDSPContext *c);
+
+void ff_cfhdencdsp_init_x86(CFHDEncDSPContext *c);
+
+#endif /* AVCODEC_CFHDENCDSP_H */