[FFmpeg-cvslog] rv34: DC-only inverse transform
Christophe GISQUET
git at videolan.org
Fri Jan 13 01:41:22 CET 2012
ffmpeg | branch: master | Christophe GISQUET <christophe.gisquet at gmail.com> | Sun Jan 1 18:33:22 2012 +0100| [3faa303a47e0c3b59a53988e0f76018930c6cb1a] | committer: Kostya Shishkov
rv34: DC-only inverse transform
When decoding coefficients, detect whether the block is DC-only, and take
advantage of this knowledge to perform DC-only inverse transform.
This is achieved by:
- first, changing the 108x4 element modulo_three_table into a 108 element
table (kind of base4), and accessing each value using mask and shifts.
- then, checking low bits for 0 (as they represent the presence of higher
frequency coefficients)
Also provide x86 SIMD code for the DC-only inverse transform.
Signed-off-by: Kostya Shishkov <kostya.shishkov at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3faa303a47e0c3b59a53988e0f76018930c6cb1a
---
libavcodec/rv34.c | 95 +++++++++++++++++++++++++----------------
libavcodec/rv34data.h | 44 +++++++------------
libavcodec/rv34dsp.c | 24 ++++++++++
libavcodec/rv34dsp.h | 2 +
libavcodec/x86/Makefile | 6 ++-
libavcodec/x86/rv34dsp.asm | 55 +++++++++++++++++++++++
libavcodec/x86/rv34dsp_init.c | 40 +++++++++++++++++
7 files changed, 200 insertions(+), 66 deletions(-)
diff --git a/libavcodec/rv34.c b/libavcodec/rv34.c
index ec826fd..6cfefa0 100644
--- a/libavcodec/rv34.c
+++ b/libavcodec/rv34.c
@@ -204,7 +204,7 @@ static int rv34_decode_cbp(GetBitContext *gb, RV34VLC *vlc, int table)
}
for(i = 0; i < 4; i++){
- t = modulo_three_table[code][i];
+ t = (modulo_three_table[code] >> (6 - 2*i)) & 3;
if(t == 1)
cbp |= cbp_masks[get_bits1(gb)] << i;
if(t == 2)
@@ -238,41 +238,42 @@ static inline void decode_coeff(DCTELEM *dst, int coef, int esc, GetBitContext *
*/
static inline void decode_subblock(DCTELEM *dst, int code, const int is_block2, GetBitContext *gb, VLC *vlc, int q)
{
- int coeffs[4];
+ int flags = modulo_three_table[code];
- coeffs[0] = modulo_three_table[code][0];
- coeffs[1] = modulo_three_table[code][1];
- coeffs[2] = modulo_three_table[code][2];
- coeffs[3] = modulo_three_table[code][3];
- decode_coeff(dst , coeffs[0], 3, gb, vlc, q);
+ decode_coeff( dst+0, (flags >> 6) , 3, gb, vlc, q);
if(is_block2){
- decode_coeff(dst+8, coeffs[1], 2, gb, vlc, q);
- decode_coeff(dst+1, coeffs[2], 2, gb, vlc, q);
+ decode_coeff(dst+8, (flags >> 4) & 3, 2, gb, vlc, q);
+ decode_coeff(dst+1, (flags >> 2) & 3, 2, gb, vlc, q);
}else{
- decode_coeff(dst+1, coeffs[1], 2, gb, vlc, q);
- decode_coeff(dst+8, coeffs[2], 2, gb, vlc, q);
+ decode_coeff(dst+1, (flags >> 4) & 3, 2, gb, vlc, q);
+ decode_coeff(dst+8, (flags >> 2) & 3, 2, gb, vlc, q);
}
- decode_coeff(dst+9, coeffs[3], 2, gb, vlc, q);
+ decode_coeff( dst+9, (flags >> 0) & 3, 2, gb, vlc, q);
+}
+
+/**
+ * Decode a single coefficient.
+ */
+static inline void decode_subblock1(DCTELEM *dst, int code, GetBitContext *gb, VLC *vlc, int q)
+{
+ int coeff = modulo_three_table[code] >> 6;
+ decode_coeff(dst, coeff, 3, gb, vlc, q);
}
static inline void decode_subblock3(DCTELEM *dst, int code, const int is_block2, GetBitContext *gb, VLC *vlc,
int q_dc, int q_ac1, int q_ac2)
{
- int coeffs[4];
+ int flags = modulo_three_table[code];
- coeffs[0] = modulo_three_table[code][0];
- coeffs[1] = modulo_three_table[code][1];
- coeffs[2] = modulo_three_table[code][2];
- coeffs[3] = modulo_three_table[code][3];
- decode_coeff(dst , coeffs[0], 3, gb, vlc, q_dc);
+ decode_coeff( dst+0, (flags >> 6) , 3, gb, vlc, q_dc);
if(is_block2){
- decode_coeff(dst+8, coeffs[1], 2, gb, vlc, q_ac1);
- decode_coeff(dst+1, coeffs[2], 2, gb, vlc, q_ac1);
+ decode_coeff(dst+8, (flags >> 4) & 3, 2, gb, vlc, q_ac1);
+ decode_coeff(dst+1, (flags >> 2) & 3, 2, gb, vlc, q_ac1);
}else{
- decode_coeff(dst+1, coeffs[1], 2, gb, vlc, q_ac1);
- decode_coeff(dst+8, coeffs[2], 2, gb, vlc, q_ac1);
+ decode_coeff(dst+1, (flags >> 4) & 3, 2, gb, vlc, q_ac1);
+ decode_coeff(dst+8, (flags >> 2) & 3, 2, gb, vlc, q_ac1);
}
- decode_coeff(dst+9, coeffs[3], 2, gb, vlc, q_ac2);
+ decode_coeff( dst+9, (flags >> 0) & 3, 2, gb, vlc, q_ac2);
}
/**
@@ -286,16 +287,24 @@ static inline void decode_subblock3(DCTELEM *dst, int code, const int is_block2,
* o--o
*/
-static inline void rv34_decode_block(DCTELEM *dst, GetBitContext *gb, RV34VLC *rvlc, int fc, int sc, int q_dc, int q_ac1, int q_ac2)
+static inline int rv34_decode_block(DCTELEM *dst, GetBitContext *gb, RV34VLC *rvlc, int fc, int sc, int q_dc, int q_ac1, int q_ac2)
{
- int code, pattern;
+ int code, pattern, has_ac = 1;
code = get_vlc2(gb, rvlc->first_pattern[fc].table, 9, 2);
pattern = code & 0x7;
code >>= 3;
- decode_subblock3(dst, code, 0, gb, &rvlc->coefficient, q_dc, q_ac1, q_ac2);
+
+ if (modulo_three_table[code] & 0x3F) {
+ decode_subblock3(dst, code, 0, gb, &rvlc->coefficient, q_dc, q_ac1, q_ac2);
+ } else {
+ decode_subblock1(dst, code, gb, &rvlc->coefficient, q_dc);
+ if (!pattern)
+ return 0;
+ has_ac = 0;
+ }
if(pattern & 4){
code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);
@@ -309,7 +318,7 @@ static inline void rv34_decode_block(DCTELEM *dst, GetBitContext *gb, RV34VLC *r
code = get_vlc2(gb, rvlc->third_pattern[sc].table, 9, 2);
decode_subblock(dst + 8*2+2, code, 0, gb, &rvlc->coefficient, q_ac2);
}
-
+ return has_ac || pattern;
}
/**
@@ -1118,7 +1127,7 @@ static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)
MpegEncContext *s = &r->s;
GetBitContext *gb = &s->gb;
int cbp, cbp2;
- int q_dc, q_ac;
+ int q_dc, q_ac, has_ac;
int i, blknum, blkoff;
LOCAL_ALIGNED_16(DCTELEM, block16, [64]);
int luma_dc_quant;
@@ -1157,33 +1166,45 @@ static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)
if(r->is16){
q_dc = rv34_qscale_tab[luma_dc_quant];
q_ac = rv34_qscale_tab[s->qscale];
- memset(block16, 0, 64 * sizeof(*block16));
- rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac);
- r->rdsp.rv34_inv_transform_tab[1](block16);
+ s->dsp.clear_block(block16);
+ if (rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac))
+ r->rdsp.rv34_inv_transform_tab[1](block16);
+ else
+ r->rdsp.rv34_inv_transform_dc_tab[1](block16);
}
q_ac = rv34_qscale_tab[s->qscale];
for(i = 0; i < 16; i++, cbp >>= 1){
+ DCTELEM *ptr;
if(!r->is16 && !(cbp & 1)) continue;
blknum = ((i & 2) >> 1) + ((i & 8) >> 2);
blkoff = ((i & 1) << 2) + ((i & 4) << 3);
+ ptr = s->block[blknum] + blkoff;
if(cbp & 1)
- rv34_decode_block(s->block[blknum] + blkoff, gb,
- r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);
+ has_ac = rv34_decode_block(ptr, gb, r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);
+ else
+ has_ac = 0;
if(r->is16) //FIXME: optimize
- s->block[blknum][blkoff] = block16[(i & 3) | ((i & 0xC) << 1)];
- r->rdsp.rv34_inv_transform_tab[0](s->block[blknum] + blkoff);
+ ptr[0] = block16[(i & 3) | ((i & 0xC) << 1)];
+ if(has_ac)
+ r->rdsp.rv34_inv_transform_tab[0](ptr);
+ else
+ r->rdsp.rv34_inv_transform_dc_tab[0](ptr);
}
if(r->block_type == RV34_MB_P_MIX16x16)
r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];
q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];
for(; i < 24; i++, cbp >>= 1){
+ DCTELEM *ptr;
if(!(cbp & 1)) continue;
blknum = ((i & 4) >> 2) + 4;
blkoff = ((i & 1) << 2) + ((i & 2) << 4);
- rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->chroma_vlc, 1, q_dc, q_ac, q_ac);
- r->rdsp.rv34_inv_transform_tab[0](s->block[blknum] + blkoff);
+ ptr = s->block[blknum] + blkoff;
+ if (rv34_decode_block(ptr, gb, r->cur_vlcs, r->chroma_vlc, 1, q_dc, q_ac, q_ac))
+ r->rdsp.rv34_inv_transform_tab[0](ptr);
+ else
+ r->rdsp.rv34_inv_transform_dc_tab[0](ptr);
}
if (IS_INTRA(s->current_picture_ptr->f.mb_type[mb_pos]))
rv34_output_macroblock(r, intra_types, cbp2, r->is16);
diff --git a/libavcodec/rv34data.h b/libavcodec/rv34data.h
index fa41a88..41c5b20 100644
--- a/libavcodec/rv34data.h
+++ b/libavcodec/rv34data.h
@@ -50,34 +50,22 @@ static const uint8_t rv34_cbp_code[16] = {
* A lot of four-tuples in RV40 are represented as c0*27+c1*9+c2*3+c3.
* This table allows conversion from a value back to a vector.
*/
-static const uint8_t modulo_three_table[108][4] = {
- { 0, 0, 0, 0 }, { 0, 0, 0, 1 }, { 0, 0, 0, 2 }, { 0, 0, 1, 0 },
- { 0, 0, 1, 1 }, { 0, 0, 1, 2 }, { 0, 0, 2, 0 }, { 0, 0, 2, 1 },
- { 0, 0, 2, 2 }, { 0, 1, 0, 0 }, { 0, 1, 0, 1 }, { 0, 1, 0, 2 },
- { 0, 1, 1, 0 }, { 0, 1, 1, 1 }, { 0, 1, 1, 2 }, { 0, 1, 2, 0 },
- { 0, 1, 2, 1 }, { 0, 1, 2, 2 }, { 0, 2, 0, 0 }, { 0, 2, 0, 1 },
- { 0, 2, 0, 2 }, { 0, 2, 1, 0 }, { 0, 2, 1, 1 }, { 0, 2, 1, 2 },
- { 0, 2, 2, 0 }, { 0, 2, 2, 1 }, { 0, 2, 2, 2 }, { 1, 0, 0, 0 },
- { 1, 0, 0, 1 }, { 1, 0, 0, 2 }, { 1, 0, 1, 0 }, { 1, 0, 1, 1 },
- { 1, 0, 1, 2 }, { 1, 0, 2, 0 }, { 1, 0, 2, 1 }, { 1, 0, 2, 2 },
- { 1, 1, 0, 0 }, { 1, 1, 0, 1 }, { 1, 1, 0, 2 }, { 1, 1, 1, 0 },
- { 1, 1, 1, 1 }, { 1, 1, 1, 2 }, { 1, 1, 2, 0 }, { 1, 1, 2, 1 },
- { 1, 1, 2, 2 }, { 1, 2, 0, 0 }, { 1, 2, 0, 1 }, { 1, 2, 0, 2 },
- { 1, 2, 1, 0 }, { 1, 2, 1, 1 }, { 1, 2, 1, 2 }, { 1, 2, 2, 0 },
- { 1, 2, 2, 1 }, { 1, 2, 2, 2 }, { 2, 0, 0, 0 }, { 2, 0, 0, 1 },
- { 2, 0, 0, 2 }, { 2, 0, 1, 0 }, { 2, 0, 1, 1 }, { 2, 0, 1, 2 },
- { 2, 0, 2, 0 }, { 2, 0, 2, 1 }, { 2, 0, 2, 2 }, { 2, 1, 0, 0 },
- { 2, 1, 0, 1 }, { 2, 1, 0, 2 }, { 2, 1, 1, 0 }, { 2, 1, 1, 1 },
- { 2, 1, 1, 2 }, { 2, 1, 2, 0 }, { 2, 1, 2, 1 }, { 2, 1, 2, 2 },
- { 2, 2, 0, 0 }, { 2, 2, 0, 1 }, { 2, 2, 0, 2 }, { 2, 2, 1, 0 },
- { 2, 2, 1, 1 }, { 2, 2, 1, 2 }, { 2, 2, 2, 0 }, { 2, 2, 2, 1 },
- { 2, 2, 2, 2 }, { 3, 0, 0, 0 }, { 3, 0, 0, 1 }, { 3, 0, 0, 2 },
- { 3, 0, 1, 0 }, { 3, 0, 1, 1 }, { 3, 0, 1, 2 }, { 3, 0, 2, 0 },
- { 3, 0, 2, 1 }, { 3, 0, 2, 2 }, { 3, 1, 0, 0 }, { 3, 1, 0, 1 },
- { 3, 1, 0, 2 }, { 3, 1, 1, 0 }, { 3, 1, 1, 1 }, { 3, 1, 1, 2 },
- { 3, 1, 2, 0 }, { 3, 1, 2, 1 }, { 3, 1, 2, 2 }, { 3, 2, 0, 0 },
- { 3, 2, 0, 1 }, { 3, 2, 0, 2 }, { 3, 2, 1, 0 }, { 3, 2, 1, 1 },
- { 3, 2, 1, 2 }, { 3, 2, 2, 0 }, { 3, 2, 2, 1 }, { 3, 2, 2, 2 },
+static const uint8_t modulo_three_table[108] = {
+ 0x00, 0x01, 0x02, 0x04, 0x05, 0x06, 0x08, 0x09, 0x0A,
+ 0x10, 0x11, 0x12, 0x14, 0x15, 0x16, 0x18, 0x19, 0x1A,
+ 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2A,
+
+ 0x40, 0x41, 0x42, 0x44, 0x45, 0x46, 0x48, 0x49, 0x4A,
+ 0x50, 0x51, 0x52, 0x54, 0x55, 0x56, 0x58, 0x59, 0x5A,
+ 0x60, 0x61, 0x62, 0x64, 0x65, 0x66, 0x68, 0x69, 0x6A,
+
+ 0x80, 0x81, 0x82, 0x84, 0x85, 0x86, 0x88, 0x89, 0x8A,
+ 0x90, 0x91, 0x92, 0x94, 0x95, 0x96, 0x98, 0x99, 0x9A,
+ 0xA0, 0xA1, 0xA2, 0xA4, 0xA5, 0xA6, 0xA8, 0xA9, 0xAA,
+
+ 0xC0, 0xC1, 0xC2, 0xC4, 0xC5, 0xC6, 0xC8, 0xC9, 0xCA,
+ 0xD0, 0xD1, 0xD2, 0xD4, 0xD5, 0xD6, 0xD8, 0xD9, 0xDA,
+ 0xE0, 0xE1, 0xE2, 0xE4, 0xE5, 0xE6, 0xE8, 0xE9, 0xEA,
};
/**
diff --git a/libavcodec/rv34dsp.c b/libavcodec/rv34dsp.c
index 1f4cea8..1767be4 100644
--- a/libavcodec/rv34dsp.c
+++ b/libavcodec/rv34dsp.c
@@ -97,13 +97,37 @@ static void rv34_inv_transform_noround_c(DCTELEM *block){
}
}
+static void rv34_inv_transform_dc_c(DCTELEM *block)
+{
+ DCTELEM dc = (13 * 13 * block[0] + 0x200) >> 10;
+ int i, j;
+
+ for (i = 0; i < 4; i++, block += 8)
+ for (j = 0; j < 4; j++)
+ block[j] = dc;
+}
+
+static void rv34_inv_transform_dc_noround_c(DCTELEM *block)
+{
+ DCTELEM dc = (13 * 13 * 3 * block[0]) >> 11;
+ int i, j;
+
+ for (i = 0; i < 4; i++, block += 8)
+ for (j = 0; j < 4; j++)
+ block[j] = dc;
+}
+
/** @} */ // transform
av_cold void ff_rv34dsp_init(RV34DSPContext *c, DSPContext* dsp) {
c->rv34_inv_transform_tab[0] = rv34_inv_transform_c;
c->rv34_inv_transform_tab[1] = rv34_inv_transform_noround_c;
+ c->rv34_inv_transform_dc_tab[0] = rv34_inv_transform_dc_c;
+ c->rv34_inv_transform_dc_tab[1] = rv34_inv_transform_dc_noround_c;
if (HAVE_NEON)
ff_rv34dsp_init_neon(c, dsp);
+ if (HAVE_MMX)
+ ff_rv34dsp_init_x86(c, dsp);
}
diff --git a/libavcodec/rv34dsp.h b/libavcodec/rv34dsp.h
index f2bc20e..6f53a09 100644
--- a/libavcodec/rv34dsp.h
+++ b/libavcodec/rv34dsp.h
@@ -56,6 +56,7 @@ typedef struct RV34DSPContext {
h264_chroma_mc_func avg_chroma_pixels_tab[3];
rv40_weight_func rv40_weight_pixels_tab[2];
rv34_inv_transform_func rv34_inv_transform_tab[2];
+ void (*rv34_inv_transform_dc_tab[2])(DCTELEM *block);
rv40_weak_loop_filter_func rv40_weak_loop_filter[2];
rv40_strong_loop_filter_func rv40_strong_loop_filter[2];
rv40_loop_filter_strength_func rv40_loop_filter_strength[2];
@@ -66,6 +67,7 @@ void ff_rv34dsp_init(RV34DSPContext *c, DSPContext* dsp);
void ff_rv40dsp_init(RV34DSPContext *c, DSPContext* dsp);
void ff_rv34dsp_init_neon(RV34DSPContext *c, DSPContext *dsp);
+void ff_rv34dsp_init_x86(RV34DSPContext *c, DSPContext *dsp);
void ff_rv40dsp_init_x86(RV34DSPContext *c, DSPContext *dsp);
void ff_rv40dsp_init_neon(RV34DSPContext *c, DSPContext *dsp);
diff --git a/libavcodec/x86/Makefile b/libavcodec/x86/Makefile
index 2abe4fb..1e88e4a 100644
--- a/libavcodec/x86/Makefile
+++ b/libavcodec/x86/Makefile
@@ -24,7 +24,11 @@ YASM-OBJS-$(CONFIG_H264PRED) += x86/h264_intrapred.o \
x86/h264_intrapred_10bit.o
MMX-OBJS-$(CONFIG_H264PRED) += x86/h264_intrapred_init.o
-MMX-OBJS-$(CONFIG_RV40_DECODER) += x86/rv40dsp.o \
+MMX-OBJS-$(CONFIG_RV30_DECODER) += x86/rv34dsp_init.o
+YASM-OBJS-$(CONFIG_RV30_DECODER) += x86/rv34dsp.o
+MMX-OBJS-$(CONFIG_RV40_DECODER) += x86/rv34dsp_init.o \
+ x86/rv40dsp.o
+YASM-OBJS-$(CONFIG_RV40_DECODER) += x86/rv34dsp.o
YASM-OBJS-$(CONFIG_VC1_DECODER) += x86/vc1dsp_yasm.o
diff --git a/libavcodec/x86/rv34dsp.asm b/libavcodec/x86/rv34dsp.asm
new file mode 100644
index 0000000..58f1af0
--- /dev/null
+++ b/libavcodec/x86/rv34dsp.asm
@@ -0,0 +1,55 @@
+;******************************************************************************
+;* MMX/SSE2-optimized functions for the RV30 and RV40 decoders
+;* Copyright (C) 2012 Christophe Gisquet <christophe.gisquet at gmail.com>
+;*
+;* This file is part of Libav.
+;*
+;* Libav is free software; you can redistribute it and/or
+;* modify it under the terms of the GNU Lesser General Public
+;* License as published by the Free Software Foundation; either
+;* version 2.1 of the License, or (at your option) any later version.
+;*
+;* Libav is distributed in the hope that it will be useful,
+;* but WITHOUT ANY WARRANTY; without even the implied warranty of
+;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;* Lesser General Public License for more details.
+;*
+;* You should have received a copy of the GNU Lesser General Public
+;* License along with Libav; if not, write to the Free Software
+;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+;******************************************************************************
+
+%include "x86inc.asm"
+%include "x86util.asm"
+
+SECTION .text
+
+%macro IDCT_DC_NOROUND 1
+ imul %1, 13*13*3
+ sar %1, 11
+%endmacro
+
+%macro IDCT_DC_ROUND 1
+ imul %1, 13*13
+ add %1, 0x200
+ sar %1, 10
+%endmacro
+
+%macro rv34_idct_dequant4x4_dc 1
+cglobal rv34_idct_dequant4x4_%1_mmx2, 1, 2, 0
+ movsx r1, word [r0]
+ IDCT_DC r1
+ movd mm0, r1
+ pshufw mm0, mm0, 0
+ movq [r0+ 0], mm0
+ movq [r0+16], mm0
+ movq [r0+32], mm0
+ movq [r0+48], mm0
+ REP_RET
+%endmacro
+
+INIT_MMX
+%define IDCT_DC IDCT_DC_ROUND
+rv34_idct_dequant4x4_dc dc
+%define IDCT_DC IDCT_DC_NOROUND
+rv34_idct_dequant4x4_dc dc_noround
diff --git a/libavcodec/x86/rv34dsp_init.c b/libavcodec/x86/rv34dsp_init.c
new file mode 100644
index 0000000..4317e9b
--- /dev/null
+++ b/libavcodec/x86/rv34dsp_init.c
@@ -0,0 +1,40 @@
+/*
+ * RV30/40 MMX/SSE2 optimizations
+ * Copyright (C) 2012 Christophe Gisquet <christophe.gisquet at gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/cpu.h"
+#include "libavutil/x86_cpu.h"
+#include "libavcodec/dsputil.h"
+#include "libavcodec/rv34dsp.h"
+
+void ff_rv34_idct_dequant4x4_dc_mmx2(DCTELEM *block);
+void ff_rv34_idct_dequant4x4_dc_noround_mmx2(DCTELEM *block);
+
+av_cold void ff_rv34dsp_init_x86(RV34DSPContext* c, DSPContext *dsp)
+{
+#if HAVE_YASM
+ int mm_flags = av_get_cpu_flags();
+
+ if (mm_flags & AV_CPU_FLAG_MMX2) {
+ c->rv34_inv_transform_dc_tab[0] = ff_rv34_idct_dequant4x4_dc_mmx2;
+ c->rv34_inv_transform_dc_tab[1] = ff_rv34_idct_dequant4x4_dc_noround_mmx2;
+ }
+#endif
+}
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