avcodec/dct: Move fdct function declarations to fdctdsp.h

It is the more proper place for them given that this is
the only API using them.
Also use a forward-declaration of AVCodecContext in fdctdsp.h
to avoid including avcodec.h in jfdct(fst|int).c.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/asvenc.c

@@ -33,7 +33,6 @@
 #include "asv.h"
 #include "avcodec.h"
 #include "codec_internal.h"
-#include "dct.h"
 #include "encode.h"
 #include "fdctdsp.h"
 #include "mpeg12data.h"

libavcodec/dct.h

@@ -52,13 +52,6 @@ void ff_dct_end (DCTContext *s);
 
 void ff_dct_init_x86(DCTContext *s);
 
-void ff_fdct_ifast(int16_t *data);
-void ff_fdct_ifast248(int16_t *data);
-void ff_jpeg_fdct_islow_8(int16_t *data);
-void ff_jpeg_fdct_islow_10(int16_t *data);
-void ff_fdct248_islow_8(int16_t *data);
-void ff_fdct248_islow_10(int16_t *data);
-
 void ff_j_rev_dct(int16_t *data);
 void ff_j_rev_dct4(int16_t *data);
 void ff_j_rev_dct2(int16_t *data);

libavcodec/fdctdsp.c

@@ -18,7 +18,6 @@
 
 #include "libavutil/attributes.h"
 #include "avcodec.h"
-#include "dct.h"
 #include "faandct.h"
 #include "fdctdsp.h"
 #include "config.h"

libavcodec/fdctdsp.h

@@ -21,17 +21,24 @@
 
 #include <stdint.h>
 
-#include "avcodec.h"
+struct AVCodecContext;
 
 typedef struct FDCTDSPContext {
     void (*fdct)(int16_t *block /* align 16 */);
     void (*fdct248)(int16_t *block /* align 16 */);
 } FDCTDSPContext;
 
-void ff_fdctdsp_init(FDCTDSPContext *c, AVCodecContext *avctx);
-void ff_fdctdsp_init_ppc(FDCTDSPContext *c, AVCodecContext *avctx,
+void ff_fdctdsp_init(FDCTDSPContext *c, struct AVCodecContext *avctx);
+void ff_fdctdsp_init_ppc(FDCTDSPContext *c, struct AVCodecContext *avctx,
                          unsigned high_bit_depth);
-void ff_fdctdsp_init_x86(FDCTDSPContext *c, AVCodecContext *avctx,
+void ff_fdctdsp_init_x86(FDCTDSPContext *c, struct AVCodecContext *avctx,
                          unsigned high_bit_depth);
 
+void ff_fdct_ifast(int16_t *data);
+void ff_fdct_ifast248(int16_t *data);
+void ff_jpeg_fdct_islow_8(int16_t *data);
+void ff_jpeg_fdct_islow_10(int16_t *data);
+void ff_fdct248_islow_8(int16_t *data);
+void ff_fdct248_islow_10(int16_t *data);
+
 #endif /* AVCODEC_FDCTDSP_H */

libavcodec/jfdctfst.c

@@ -68,7 +68,7 @@
 
 #include <stdint.h>
 #include "libavutil/attributes.h"
-#include "dct.h"
+#include "fdctdsp.h"
 
 #define DCTSIZE 8
 #define GLOBAL(x) x

libavcodec/jfdctint_template.c

@@ -60,7 +60,7 @@
  */
 
 #include "libavutil/common.h"
-#include "dct.h"
+#include "fdctdsp.h"
 
 #include "bit_depth_template.c"
 

libavcodec/mpegvideo_enc.c

@@ -43,7 +43,6 @@
 #include "libavutil/opt.h"
 #include "libavutil/thread.h"
 #include "avcodec.h"
-#include "dct.h"
 #include "encode.h"
 #include "idctdsp.h"
 #include "mpeg12codecs.h"

libavcodec/ppc/fdctdsp.c

@@ -25,6 +25,7 @@
 #include "libavutil/ppc/cpu.h"
 #include "libavutil/ppc/util_altivec.h"
 
+#include "libavcodec/avcodec.h"
 #include "libavcodec/fdctdsp.h"
 
 #include "fdct.h"

libavcodec/tests/dct.c

@@ -43,6 +43,7 @@
 #include "libavutil/time.h"
 
 #include "libavcodec/dct.h"
+#include "libavcodec/fdctdsp.h"
 #include "libavcodec/idctdsp.h"
 #include "libavcodec/simple_idct.h"
 #include "libavcodec/xvididct.h"