Better ARM support for mplayer/ffmpeg, ported from atty fork

while playing with some new hardware, I found it's running a forked mplayer
 -- and it looks like they're following the GPL.

 The maintainer's page is here: http://atty.jp/?Zaurus/mplayer
 Unfortunately it's mostly in Japanese, so it's hard to figure out any
  details.

  Their code looks quite interesting (at least to those of us w/ ARM CPUs).

  The patches I've attached are the patches from atty.jp with a couple of
  modifications by myself:
  - ported to current CVS
  - reverted their change of removing SNOW support from ffmpeg
  - cleaned up their bswap mess
  - removed DOS-style linebreaks from various files

patch by (Bernhard Rosenkraenzer: bero, arklinux org)

Originally committed as revision 4311 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 97 insertions, 0 deletions

diff --git a/libavcodec/armv4l/mpegvideo_iwmmxt.c b/libavcodec/armv4l/mpegvideo_iwmmxt.c
new file mode 100644
index 0000000000..0f4c99e3ac
--- /dev/null
+++ b/libavcodec/armv4l/mpegvideo_iwmmxt.c
@@ -0,0 +1,97 @@
+#include "../dsputil.h"
+#include "../mpegvideo.h"
+#include "../avcodec.h"
+
+static void dct_unquantize_h263_intra_iwmmxt(MpegEncContext *s,
+                                             DCTELEM *block, int n, int qscale)
+{
+    int level, qmul, qadd;
+    int nCoeffs;
+    DCTELEM *block_orig = block;
+
+    assert(s->block_last_index[n]>=0);
+
+    qmul = qscale << 1;
+
+    if (!s->h263_aic) {
+        if (n < 4)
+            level = block[0] * s->y_dc_scale;
+        else
+            level = block[0] * s->c_dc_scale;
+        qadd = (qscale - 1) | 1;
+    }else{
+        qadd = 0;
+        level = block[0];
+    }
+    if(s->ac_pred)
+        nCoeffs=63;
+    else
+        nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
+
+    __asm__ __volatile__ (
+/*      "movd %1, %%mm6                 \n\t" //qmul */
+/*      "packssdw %%mm6, %%mm6          \n\t" */
+/*      "packssdw %%mm6, %%mm6          \n\t" */
+        "tbcsth wr6, %[qmul]            \n\t"
+/*      "movd %2, %%mm5                 \n\t" //qadd */
+/*      "packssdw %%mm5, %%mm5          \n\t" */
+/*      "packssdw %%mm5, %%mm5          \n\t" */
+        "tbcsth wr5, %[qadd]            \n\t"
+        "wzero wr7                      \n\t" /* "pxor %%mm7, %%mm7             \n\t" */
+        "wzero wr4                      \n\t" /* "pxor %%mm4, %%mm4             \n\t" */
+        "wsubh wr7, wr5, wr7            \n\t" /* "psubw %%mm5, %%mm7            \n\t" */
+        "1:                             \n\t"
+        "wldrd wr2, [%[block]]          \n\t" /* "movq (%0, %3), %%mm0          \n\t" */
+        "wldrd wr3, [%[block], #8]      \n\t" /* "movq 8(%0, %3), %%mm1         \n\t" */
+        "wmulsl wr0, wr6, wr2           \n\t" /* "pmullw %%mm6, %%mm0           \n\t" */
+        "wmulsl wr1, wr6, wr3           \n\t" /* "pmullw %%mm6, %%mm1           \n\t" */
+/*      "movq (%0, %3), %%mm2           \n\t" */
+/*      "movq 8(%0, %3), %%mm3          \n\t" */
+        "wcmpgtsh wr2, wr4, wr2         \n\t" /* "pcmpgtw %%mm4, %%mm2          \n\t" // block[i] < 0 ? -1 : 0 */
+        "wcmpgtsh wr3, wr4, wr2         \n\t" /* "pcmpgtw %%mm4, %%mm3          \n\t" // block[i] < 0 ? -1 : 0 */
+        "wxor wr0, wr2, wr0             \n\t" /* "pxor %%mm2, %%mm0             \n\t" */
+        "wxor wr1, wr3, wr1             \n\t" /* "pxor %%mm3, %%mm1             \n\t" */
+        "waddh wr0, wr7, wr0            \n\t" /* "paddw %%mm7, %%mm0            \n\t" */
+        "waddh wr1, wr7, wr1            \n\t" /* "paddw %%mm7, %%mm1            \n\t" */
+        "wxor wr2, wr0, wr2             \n\t" /* "pxor %%mm0, %%mm2             \n\t" */
+        "wxor wr3, wr1, wr3             \n\t" /* "pxor %%mm1, %%mm3             \n\t" */
+        "wcmpeqh wr0, wr7, wr0          \n\t" /* "pcmpeqw %%mm7, %%mm0          \n\t" // block[i] == 0 ? -1 : 0 */
+        "wcmpeqh wr1, wr7, wr1          \n\t" /* "pcmpeqw %%mm7, %%mm1          \n\t" // block[i] == 0 ? -1 : 0 */
+        "wandn wr0, wr2, wr0            \n\t" /* "pandn %%mm2, %%mm0            \n\t" */
+        "wandn wr1, wr3, wr1            \n\t" /* "pandn %%mm3, %%mm1            \n\t" */
+        "wstrd wr0, [%[block]]          \n\t" /* "movq %%mm0, (%0, %3)          \n\t" */
+        "wstrd wr1, [%[block], #8]      \n\t" /* "movq %%mm1, 8(%0, %3)         \n\t" */
+        "add %[block], %[block], #16    \n\t" /* "addl $16, %3                  \n\t" */
+        "subs %[i], %[i], #1            \n\t"
+        "bne 1b                         \n\t" /* "jng 1b                                \n\t" */
+        :[block]"+r"(block)
+        :[i]"r"((nCoeffs + 8) / 8), [qmul]"r"(qmul), [qadd]"r"(qadd)
+        :"memory");
+
+    block_orig[0] = level;
+}
+
+#if 0
+static void dct_unquantize_h263_inter_iwmmxt(MpegEncContext *s,
+                                             DCTELEM *block, int n, int qscale)
+{
+    int nCoeffs;
+
+    assert(s->block_last_index[n]>=0);
+
+    if(s->ac_pred)
+        nCoeffs=63;
+    else
+        nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
+
+    ippiQuantInvInter_Compact_H263_16s_I(block, nCoeffs+1, qscale);
+}
+#endif
+
+void MPV_common_init_iwmmxt(MpegEncContext *s)
+{
+    s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_iwmmxt;
+#if 0
+    s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_iwmmxt;
+#endif
+}