avcodec/mips: [loongson] optimize theora decoding with mmi.

Optimize theora decoding with mmi in functions:
1. ff_vp3_idct_add_mmi
2. ff_vp3_idct_put_mmi
3. ff_vp3_idct_dc_add_mmi
4. ff_put_no_rnd_pixels_l2_mmi

Theora decoding speed improved about 32%(from 88fps to 116fps, Tested on loongson 3A3000).
Reviewed-by: Shiyou Yin <yinshiyou-hf@loongson.cn>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/mips/Makefile

@@ -87,3 +87,4 @@ MMI-OBJS-$(CONFIG_HPELDSP)                += mips/hpeldsp_mmi.o
 MMI-OBJS-$(CONFIG_VC1_DECODER)            += mips/vc1dsp_mmi.o
 MMI-OBJS-$(CONFIG_WMV2DSP)                += mips/wmv2dsp_mmi.o
 MMI-OBJS-$(CONFIG_HEVC_DECODER)           += mips/hevcdsp_mmi.o
+MMI-OBJS-$(CONFIG_VP3DSP)                 += mips/vp3dsp_idct_mmi.o

libavcodec/mips/vp3dsp_init_mips.c

@@ -38,8 +38,22 @@ static av_cold void vp3dsp_init_msa(VP3DSPContext *c, int flags)
 }
 #endif /* HAVE_MSA */
 
+#if HAVE_MMI
+static av_cold void vp3dsp_init_mmi(VP3DSPContext *c, int flags)
+{
+    c->put_no_rnd_pixels_l2 = ff_put_no_rnd_pixels_l2_mmi;
+
+    c->idct_add      = ff_vp3_idct_add_mmi;
+    c->idct_put      = ff_vp3_idct_put_mmi;
+    c->idct_dc_add   = ff_vp3_idct_dc_add_mmi;
+}
+#endif /* HAVE_MMI */
+
 av_cold void ff_vp3dsp_init_mips(VP3DSPContext *c, int flags)
 {
+#if HAVE_MMI
+    vp3dsp_init_mmi(c, flags);
+#endif /* HAVE_MMI */
 #if HAVE_MSA
     vp3dsp_init_msa(c, flags);
 #endif /* HAVE_MSA */

libavcodec/mips/vp3dsp_mips.h

@@ -34,4 +34,10 @@ void ff_put_no_rnd_pixels_l2_msa(uint8_t *dst, const uint8_t *src1,
 void ff_vp3_h_loop_filter_msa(uint8_t *first_pixel, ptrdiff_t stride,
                               int *bounding_values);
 
+void ff_vp3_idct_add_mmi(uint8_t *dest, ptrdiff_t line_size, int16_t *block);
+void ff_vp3_idct_put_mmi(uint8_t *dest, ptrdiff_t line_size, int16_t *block);
+void ff_vp3_idct_dc_add_mmi(uint8_t *dest, ptrdiff_t line_size, int16_t *block);
+void ff_put_no_rnd_pixels_l2_mmi(uint8_t *dst, const uint8_t *src1,
+                                 const uint8_t *src2, ptrdiff_t stride, int h);
+
 #endif /* #ifndef AVCODEC_MIPS_VP3DSP_MIPS_H */