diracdsp: add dequantization SIMD

Currently unused, to be used in the following commits.
Signed-off-by: Rostislav Pehlivanov <rpehlivanov@obe.tv>

libavcodec/diracdsp.c

@@ -189,6 +189,27 @@ static void add_rect_clamped_c(uint8_t *dst, const uint16_t *src, int stride,
     }
 }
 
+#define DEQUANT_SUBBAND(PX)                                                                \
+static void dequant_subband_ ## PX ## _c(uint8_t *src, uint8_t *dst, ptrdiff_t stride,     \
+                                         const int qf, const int qs, int tot_v, int tot_h) \
+{                                                                                          \
+    int i, y;                                                                              \
+    for (y = 0; y < tot_v; y++) {                                                          \
+        PX c, sign, *src_r = (PX *)src, *dst_r = (PX *)dst;                                \
+        for (i = 0; i < tot_h; i++) {                                                      \
+            c = *src_r++;                                                                  \
+            sign = FFSIGN(c)*(!!c);                                                        \
+            c = (FFABS(c)*qf + qs) >> 2;                                                   \
+            *dst_r++ = c*sign;                                                             \
+        }                                                                                  \
+        src += tot_h << (sizeof(PX) >> 1);                                                 \
+        dst += stride;                                                                     \
+    }                                                                                      \
+}
+
+DEQUANT_SUBBAND(int16_t)
+DEQUANT_SUBBAND(int32_t)
+
 #define PIXFUNC(PFX, WIDTH)                                             \
     c->PFX ## _dirac_pixels_tab[WIDTH>>4][0] = ff_ ## PFX ## _dirac_pixels ## WIDTH ## _c; \
     c->PFX ## _dirac_pixels_tab[WIDTH>>4][1] = ff_ ## PFX ## _dirac_pixels ## WIDTH ## _l2_c; \
@@ -214,6 +235,9 @@ av_cold void ff_diracdsp_init(DiracDSPContext *c)
     c->biweight_dirac_pixels_tab[1] = biweight_dirac_pixels16_c;
     c->biweight_dirac_pixels_tab[2] = biweight_dirac_pixels32_c;
 
+    c->dequant_subband[0] = c->dequant_subband[2] = dequant_subband_int16_t_c;
+    c->dequant_subband[1] = c->dequant_subband[3] = dequant_subband_int32_t_c;
+
     PIXFUNC(put, 8);
     PIXFUNC(put, 16);
     PIXFUNC(put, 32);

libavcodec/diracdsp.h

@@ -22,6 +22,7 @@
 #define AVCODEC_DIRACDSP_H
 
 #include <stdint.h>
+#include <stddef.h>
 
 typedef void (*dirac_weight_func)(uint8_t *block, int stride, int log2_denom, int weight, int h);
 typedef void (*dirac_biweight_func)(uint8_t *dst, const uint8_t *src, int stride, int log2_denom, int weightd, int weights, int h);
@@ -46,6 +47,9 @@ typedef struct {
     void (*add_rect_clamped)(uint8_t *dst/*align 16*/, const uint16_t *src/*align 16*/, int stride, const int16_t *idwt/*align 16*/, int idwt_stride, int width, int height/*mod 2*/);
     void (*add_dirac_obmc[3])(uint16_t *dst, const uint8_t *src, int stride, const uint8_t *obmc_weight, int yblen);
 
+    /* 0-1: int16_t and int32_t asm/c, 2-3: int16 and int32_t, C only */
+    void (*dequant_subband[4])(uint8_t *src, uint8_t *dst, ptrdiff_t stride, const int qf, const int qs, int tot_v, int tot_h);
+
     dirac_weight_func weight_dirac_pixels_tab[3];
     dirac_biweight_func biweight_dirac_pixels_tab[3];
 } DiracDSPContext;

libavcodec/x86/diracdsp.asm

@@ -263,3 +263,40 @@ ADD_RECT sse2
 HPEL_FILTER sse2
 ADD_OBMC 32, sse2
 ADD_OBMC 16, sse2
+
+INIT_XMM sse4
+
+; void dequant_subband_32(uint8_t *src, uint8_t *dst, ptrdiff_t stride, const int qf, const int qs, int tot_v, int tot_h)
+cglobal dequant_subband_32, 7, 7, 4, src, dst, stride, qf, qs, tot_v, tot_h
+    movd   m2, qfd
+    movd   m3, qsd
+    SPLATD m2
+    SPLATD m3
+    mov    r4, tot_hq
+    mov    r3, dstq
+
+    .loop_v:
+    mov    tot_hq, r4
+    mov    dstq,   r3
+
+    .loop_h:
+    movu   m0, [srcq]
+
+    pabsd  m1, m0
+    pmulld m1, m2
+    paddd  m1, m3
+    psrld  m1,  2
+    psignd m1, m0
+
+    movu   [dstq], m1
+
+    add    srcq, mmsize
+    add    dstq, mmsize
+    sub    tot_hd, 4
+    jg     .loop_h
+
+    add    r3, strideq
+    dec    tot_vd
+    jg     .loop_v
+
+    RET

libavcodec/x86/diracdsp_init.c

@@ -46,6 +46,8 @@ void ff_put_rect_clamped_sse2(uint8_t *dst, int dst_stride, const int16_t *src,
 void ff_put_signed_rect_clamped_mmx(uint8_t *dst, int dst_stride, const int16_t *src, int src_stride, int width, int height);
 void ff_put_signed_rect_clamped_sse2(uint8_t *dst, int dst_stride, const int16_t *src, int src_stride, int width, int height);
 
+void ff_dequant_subband_32_sse4(uint8_t *src, uint8_t *dst, ptrdiff_t stride, const int qf, const int qs, int tot_v, int tot_h);
+
 #if HAVE_YASM
 
 #define HPEL_FILTER(MMSIZE, EXT)                                                             \
@@ -184,4 +186,8 @@ void ff_diracdsp_init_x86(DiracDSPContext* c)
         c->put_dirac_pixels_tab[2][0] = ff_put_dirac_pixels32_sse2;
         c->avg_dirac_pixels_tab[2][0] = ff_avg_dirac_pixels32_sse2;
     }
+
+    if (EXTERNAL_SSE4(mm_flags)) {
+        c->dequant_subband[1]         = ff_dequant_subband_32_sse4;
+    }
 }