avcodec/v210enc: Move ff_v210enc_init into a header

This removes a dependency of checkasm on lavc/v210_enc.o
and also allows to inline ff_v210enc_init() irrespectively of
interposing.
This dependency pulled basically all of libavcodec into checkasm,
in particular all codecs.
This also makes checkasm work when using shared Windows builds:
On Windows, it needs to be known to the compiler whether a data
symbol is external to the library/executable or not; hence the
need for av_export_avutil. checkasm needs access to the internals
of the libraries it tests and is therefore linked statically to all
the libraries. This means that the users of avpriv_cga_font and
avpriv_vga16_font in libavcodec (namely ansi.o, bintext.o, tmv.o)
end up in the same executable as the symbols, although they have
been compiled as if these symbols were external, leading to linker
errors. With this commit said files are discarded by the linker,
bypassing this problem.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/v210_template.c

@@ -22,16 +22,6 @@
 #include "bytestream.h"
 #include "internal.h"
 
-#define CLIP(v, depth) av_clip(v, 1<<(depth-8), ((1<<depth)-(1<<(depth-8))-1))
-#define WRITE_PIXELS(a, b, c, depth)                      \
-    do {                                                  \
-        val  =  CLIP(*a++, depth)  << (10-depth);         \
-        val |=  (CLIP(*b++, depth) << (20-depth)) |       \
-                (CLIP(*c++, depth) << (30-depth));        \
-        AV_WL32(dst, val);                                \
-        dst += 4;                                         \
-    } while (0)
-
 static void RENAME(v210_enc)(AVCodecContext *avctx,
         uint8_t *dst, const AVFrame *pic)
 {

libavcodec/v210enc.c

@@ -27,6 +27,7 @@
 #include "encode.h"
 #include "internal.h"
 #include "v210enc.h"
+#include "v210enc_init.h"
 
 #define TYPE uint8_t
 #define DEPTH 8
@@ -48,52 +49,6 @@
 #undef BYTES_PER_PIXEL
 #undef TYPE
 
-static void v210_planar_pack_8_c(const uint8_t *y, const uint8_t *u,
-                                 const uint8_t *v, uint8_t *dst,
-                                 ptrdiff_t width)
-{
-    uint32_t val;
-    int i;
-
-    /* unroll this to match the assembly */
-    for (i = 0; i < width - 11; i += 12) {
-        WRITE_PIXELS(u, y, v, 8);
-        WRITE_PIXELS(y, u, y, 8);
-        WRITE_PIXELS(v, y, u, 8);
-        WRITE_PIXELS(y, v, y, 8);
-        WRITE_PIXELS(u, y, v, 8);
-        WRITE_PIXELS(y, u, y, 8);
-        WRITE_PIXELS(v, y, u, 8);
-        WRITE_PIXELS(y, v, y, 8);
-    }
-}
-
-static void v210_planar_pack_10_c(const uint16_t *y, const uint16_t *u,
-                                  const uint16_t *v, uint8_t *dst,
-                                  ptrdiff_t width)
-{
-    uint32_t val;
-    int i;
-
-    for (i = 0; i < width - 5; i += 6) {
-        WRITE_PIXELS(u, y, v, 10);
-        WRITE_PIXELS(y, u, y, 10);
-        WRITE_PIXELS(v, y, u, 10);
-        WRITE_PIXELS(y, v, y, 10);
-    }
-}
-
-av_cold void ff_v210enc_init(V210EncContext *s)
-{
-    s->pack_line_8  = v210_planar_pack_8_c;
-    s->pack_line_10 = v210_planar_pack_10_c;
-    s->sample_factor_8  = 2;
-    s->sample_factor_10 = 1;
-
-    if (ARCH_X86)
-        ff_v210enc_init_x86(s);
-}
-
 static av_cold int encode_init(AVCodecContext *avctx)
 {
     V210EncContext *s = avctx->priv_data;

libavcodec/v210enc.h

@@ -32,8 +32,6 @@ typedef struct V210EncContext {
     int sample_factor_10;
 } V210EncContext;
 
-void ff_v210enc_init(V210EncContext *s);
-
 void ff_v210enc_init_x86(V210EncContext *s);
 
 #endif /* AVCODEC_V210ENC_H */

libavcodec/v210enc_init.h

@@ -0,0 +1,90 @@
+/*
+ * V210 encoder DSP init
+ *
+ * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot 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
+ */
+
+#ifndef AVCODEC_V210ENC_INIT_H
+#define AVCODEC_V210ENC_INIT_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "config.h"
+#include "libavutil/attributes.h"
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
+#include "v210enc.h"
+
+#define CLIP(v, depth) av_clip(v, 1<<(depth-8), ((1<<depth)-(1<<(depth-8))-1))
+#define WRITE_PIXELS(a, b, c, depth)                      \
+    do {                                                  \
+        val  =  CLIP(*a++, depth)  << (10-depth);         \
+        val |=  (CLIP(*b++, depth) << (20-depth)) |       \
+                (CLIP(*c++, depth) << (30-depth));        \
+        AV_WL32(dst, val);                                \
+        dst += 4;                                         \
+    } while (0)
+
+static void v210_planar_pack_8_c(const uint8_t *y, const uint8_t *u,
+                                 const uint8_t *v, uint8_t *dst,
+                                 ptrdiff_t width)
+{
+    uint32_t val;
+
+    /* unroll this to match the assembly */
+    for (int i = 0; i < width - 11; i += 12) {
+        WRITE_PIXELS(u, y, v, 8);
+        WRITE_PIXELS(y, u, y, 8);
+        WRITE_PIXELS(v, y, u, 8);
+        WRITE_PIXELS(y, v, y, 8);
+        WRITE_PIXELS(u, y, v, 8);
+        WRITE_PIXELS(y, u, y, 8);
+        WRITE_PIXELS(v, y, u, 8);
+        WRITE_PIXELS(y, v, y, 8);
+    }
+}
+
+static void v210_planar_pack_10_c(const uint16_t *y, const uint16_t *u,
+                                  const uint16_t *v, uint8_t *dst,
+                                  ptrdiff_t width)
+{
+    uint32_t val;
+
+    for (int i = 0; i < width - 5; i += 6) {
+        WRITE_PIXELS(u, y, v, 10);
+        WRITE_PIXELS(y, u, y, 10);
+        WRITE_PIXELS(v, y, u, 10);
+        WRITE_PIXELS(y, v, y, 10);
+    }
+}
+
+static av_cold av_unused void ff_v210enc_init(V210EncContext *s)
+{
+    s->pack_line_8  = v210_planar_pack_8_c;
+    s->pack_line_10 = v210_planar_pack_10_c;
+    s->sample_factor_8  = 2;
+    s->sample_factor_10 = 1;
+
+    if (ARCH_X86)
+        ff_v210enc_init_x86(s);
+}
+
+#endif /* AVCODEC_V210ENC_INIT_H */

tests/checkasm/v210enc.c

@@ -20,7 +20,7 @@
 
 #include <string.h>
 #include "checkasm.h"
-#include "libavcodec/v210enc.h"
+#include "libavcodec/v210enc_init.h"
 #include "libavutil/common.h"
 #include "libavutil/internal.h"
 #include "libavutil/intreadwrite.h"