xvid: Add C IDCT

Thanks to Pascal Massimino and Michael Militzer for relicensing as LGPL.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

libavcodec/dct-test.c

@@ -42,6 +42,7 @@
 #include "dct.h"
 #include "idctdsp.h"
 #include "simple_idct.h"
+#include "xvididct.h"
 #include "aandcttab.h"
 #include "faandct.h"
 #include "faanidct.h"
@@ -62,11 +63,14 @@ static const struct algo fdct_tab[4] = {
     { "IJG-LLM-INT", ff_jpeg_fdct_islow_8, FF_IDCT_PERM_NONE },
 };
 
-static const struct algo idct_tab[4] = {
+static const struct algo idct_tab[] = {
     { "FAANI",       ff_faanidct,          FF_IDCT_PERM_NONE },
     { "REF-DBL",     ff_ref_idct,          FF_IDCT_PERM_NONE },
     { "INT",         ff_j_rev_dct,         FF_IDCT_PERM_LIBMPEG2 },
     { "SIMPLE-C",    ff_simple_idct_8,     FF_IDCT_PERM_NONE },
+#if CONFIG_MPEG4_DECODER
+    { "XVID",        ff_xvid_idct,         FF_IDCT_PERM_NONE, 0, 1 },
+#endif /* CONFIG_MPEG4_DECODER */
 };
 
 #if ARCH_ARM

libavcodec/x86/xvididct_init.c

@@ -26,10 +26,16 @@
 #include "idctdsp.h"
 #include "xvididct.h"
 
-av_cold void ff_xvid_idct_init_x86(IDCTDSPContext *c)
+av_cold void ff_xvid_idct_init_x86(IDCTDSPContext *c, AVCodecContext *avctx,
+                                   unsigned high_bit_depth)
 {
     int cpu_flags = av_get_cpu_flags();
 
+    if (high_bit_depth ||
+        !(avctx->idct_algo == FF_IDCT_AUTO ||
+          avctx->idct_algo == FF_IDCT_XVID))
+        return;
+
     if (INLINE_MMX(cpu_flags)) {
         c->idct_put  = ff_xvid_idct_mmx_put;
         c->idct_add  = ff_xvid_idct_mmx_add;

libavcodec/xvididct.h

@@ -19,11 +19,16 @@
 #ifndef AVCODEC_XVIDIDCT_H
 #define AVCODEC_XVIDIDCT_H
 
+#include <stdint.h>
+
 #include "avcodec.h"
 #include "idctdsp.h"
 
+void ff_xvid_idct(int16_t *const in);
+
 void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx);
 
-void ff_xvid_idct_init_x86(IDCTDSPContext *c);
+void ff_xvid_idct_init_x86(IDCTDSPContext *c, AVCodecContext *avctx,
+                           unsigned high_bit_depth);
 
 #endif /* AVCODEC_XVIDIDCT_H */

tests/fate/xvid.mak

 fate-xvid-custom-matrix: CMD = framemd5 -flags +bitexact -idct simple  -i $(TARGET_SAMPLES)/mpeg4/xvid_vlc_trac7411.h263
-fate-xvid-idctmmx:       CMD = framemd5 -flags +bitexact -cpuflags all -i $(TARGET_SAMPLES)/mpeg4/xvid_vlc_trac7411.h263
+fate-xvid-idct:          CMD = framemd5 -flags +bitexact -cpuflags all -i $(TARGET_SAMPLES)/mpeg4/xvid_vlc_trac7411.h263
 
-FATE_XVID-$(call DEMDEC, M4V, MPEG4) += fate-xvid-custom-matrix
-FATE_XVID-$(filter $(HAVE_MMX_INLINE), $(call DEMDEC, M4V, MPEG4)) += fate-xvid-idctmmx
+FATE_XVID-$(call DEMDEC, M4V, MPEG4) += fate-xvid-custom-matrix fate-xvid-idct
 
 FATE_SAMPLES_AVCONV += $(FATE_XVID-yes)