Add lossless compression mode.

This commit adds lossless compression capability to the experimental
branch. The lossless experiment can be enabled using --enable-lossless
in configure. When the experiment is enabled, the encoder will use
lossless compression mode by command line option --lossless, and the
decoder automatically recognizes a losslessly encoded clip and decodes
accordingly.

To achieve the lossless coding, this commit has changed the following:
    1. To encode at lossless mode, encoder forces the use of unit
quantizer, i.e, Q 0, where effective quantization is 1. Encoder also
disables the usage of 8x8 transform and allows only 4x4 transform;
    2. At Q 0, the first order 4x4  DCT/IDCT have been switched over
to a pair of forward and inverse Walsh-Hadamard Transform
(http://goo.gl/EIsfy),  with proper scaling applied to match the range
of the original 4x4 DCT/IDCT pair;
    3. At Q 0, the second order remains to use the previous
walsh-hadamard transform pair. However, to maintain the reversibility
in second order transform at Q 0, scaling down is applied to first
order DC coefficients prior to forward transform, and scaling up is
applied to the second order output prior to quantization. Symmetric
upscaling and downscaling are added around inverse second order
transform;
    4. At lossless mode, encoder also disables a number of minor
features to ensure no loss is introduced, these features includes:
        a. Trellis quantization optimization
        b. Loop filtering
        c. Aggressive zero-binning, rounding and zero-bin boosting
        d. Mode based zero-bin boosting

Lossless coding test was performed on all clips within the derf set,
to verify that the commit has achieved lossless compression for all
clips. The average compression ratio is around 2.57 to 1.
(http://goo.gl/dEShs)

Change-Id: Ia3aba7dd09df40dd590f93b9aba134defbc64e34

diff --git a/configure b/configure
index b1a3f66..5f39413 100755 (executable)
--- a/configure
+++ b/configure
@@ -232,6 +232,7 @@ EXPERIMENT_LIST="
     newintramodes
     adaptive_entropy
     pred_filter
+    lossless
 "
 CONFIG_LIST="
     external_build

diff --git a/vp8/common/idct.h b/vp8/common/idct.h
index e8ca23d..bafa662 100644 (file)
--- a/vp8/common/idct.h
+++ b/vp8/common/idct.h
@@ -31,6 +31,10 @@
 #include "arm/idct_arm.h"
 #endif
 
+#if CONFIG_LOSSLESS
+#define WHT_UPSCALE_FACTOR 3
+#define Y2_WHT_UPSCALE_FACTOR 2
+#endif
 
 #ifndef vp8_idct_idct8
 #define vp8_idct_idct8 vp8_short_idct8x8_c
@@ -85,6 +89,14 @@ extern prototype_second_order(vp8_idct_iwalsh1);
 #endif
 extern prototype_second_order(vp8_idct_iwalsh16);
 
+#if CONFIG_LOSSLESS
+extern prototype_idct(vp8_short_inv_walsh4x4_x8_c);
+extern prototype_idct(vp8_short_inv_walsh4x4_1_x8_c);
+extern prototype_idct_scalar_add(vp8_dc_only_inv_walsh_add_c);
+extern prototype_second_order(vp8_short_inv_walsh4x4_lossless_c);
+extern prototype_second_order(vp8_short_inv_walsh4x4_1_lossless_c);
+#endif
+
 typedef prototype_idct((*vp8_idct_fn_t));
 typedef prototype_idct_scalar_add((*vp8_idct_scalar_add_fn_t));
 typedef prototype_second_order((*vp8_second_order_fn_t));

diff --git a/vp8/common/idctllm.c b/vp8/common/idctllm.c
index 75ce8d4..acb856d 100644 (file)
--- a/vp8/common/idctllm.c
+++ b/vp8/common/idctllm.c
@@ -23,6 +23,7 @@
  *         x * sqrt(2) * cos (pi/8) = x + x * (sqrt(2) *cos(pi/8)-1).
  **************************************************************************/
 #include "vpx_ports/config.h"
+#include "vp8/common/idct.h"
 
 
 #include <math.h>
@@ -195,6 +196,163 @@ void vp8_short_inv_walsh4x4_1_c(short *in, short *out)
     }
 }
 
+#if CONFIG_LOSSLESS
+void vp8_short_inv_walsh4x4_lossless_c(short *input, short *output)
+{
+    int i;
+    int a1, b1, c1, d1;
+    short *ip = input;
+    short *op = output;
+
+    for (i = 0; i < 4; i++)
+    {
+        a1 = ((ip[0] + ip[3]))>>Y2_WHT_UPSCALE_FACTOR;
+        b1 = ((ip[1] + ip[2]))>>Y2_WHT_UPSCALE_FACTOR;
+        c1 = ((ip[1] - ip[2]))>>Y2_WHT_UPSCALE_FACTOR;
+        d1 = ((ip[0] - ip[3]))>>Y2_WHT_UPSCALE_FACTOR;
+
+        op[0] = (a1 + b1 + 1)>>1;
+        op[1] = (c1 + d1)>>1;
+        op[2] = (a1 - b1)>>1;
+        op[3] = (d1 - c1)>>1;
+
+        ip += 4;
+        op += 4;
+    }
+
+    ip = output;
+    op = output;
+    for (i = 0; i < 4; i++)
+    {
+        a1 = ip[0] + ip[12];
+        b1 = ip[4] + ip[8];
+        c1 = ip[4] - ip[8];
+        d1 = ip[0] - ip[12];
+
+
+        op[0] = ((a1 + b1 + 1)>>1)<<Y2_WHT_UPSCALE_FACTOR;
+        op[4] = ((c1 + d1)>>1)<<Y2_WHT_UPSCALE_FACTOR;
+        op[8] = ((a1 - b1)>>1)<<Y2_WHT_UPSCALE_FACTOR;
+        op[12]= ((d1 - c1)>>1)<<Y2_WHT_UPSCALE_FACTOR;
+
+        ip++;
+        op++;
+    }
+}
+
+void vp8_short_inv_walsh4x4_1_lossless_c(short *in, short *out)
+{
+    int i;
+    short tmp[4];
+    short *ip = in;
+    short *op = tmp;
+
+    op[0] =((ip[0]>>Y2_WHT_UPSCALE_FACTOR)+ 1)>>1;
+    op[1] = op[2] = op[3] = ((ip[0]>>Y2_WHT_UPSCALE_FACTOR)>>1);
+
+    ip = tmp;
+    op = out;
+    for(i = 0; i<4; i++)
+    {
+        op[0] =((ip[0]+ 1)>>1)<<Y2_WHT_UPSCALE_FACTOR;
+        op[4] = op[8] = op[12] = ((ip[0]>>1))<<Y2_WHT_UPSCALE_FACTOR;
+        ip ++;
+        op ++;
+    }
+}
+
+void vp8_short_inv_walsh4x4_x8_c(short *input, short *output, int pitch)
+{
+    int i;
+    int a1, b1, c1, d1;
+    short *ip = input;
+    short *op = output;
+    int shortpitch = pitch >> 1;
+
+    for (i = 0; i < 4; i++)
+    {
+        a1 = ((ip[0] + ip[3]))>>WHT_UPSCALE_FACTOR;
+        b1 = ((ip[1] + ip[2]))>>WHT_UPSCALE_FACTOR;
+        c1 = ((ip[1] - ip[2]))>>WHT_UPSCALE_FACTOR;
+        d1 = ((ip[0] - ip[3]))>>WHT_UPSCALE_FACTOR;
+
+        op[0] = (a1 + b1 + 1)>>1;
+        op[1] = (c1 + d1)>>1;
+        op[2] = (a1 - b1)>>1;
+        op[3] = (d1 - c1)>>1;
+
+        ip += 4;
+        op += shortpitch;
+    }
+
+    ip = output;
+    op = output;
+    for (i = 0; i < 4; i++)
+    {
+        a1 = ip[shortpitch*0] + ip[shortpitch*3];
+        b1 = ip[shortpitch*1] + ip[shortpitch*2];
+        c1 = ip[shortpitch*1] - ip[shortpitch*2];
+        d1 = ip[shortpitch*0] - ip[shortpitch*3];
+
+
+        op[shortpitch*0] = (a1 + b1 + 1)>>1;
+        op[shortpitch*1] = (c1 + d1)>>1;
+        op[shortpitch*2] = (a1 - b1)>>1;
+        op[shortpitch*3] = (d1 - c1)>>1;
+
+        ip++;
+        op++;
+    }
+}
+
+void vp8_short_inv_walsh4x4_1_x8_c(short *in, short *out, int pitch)
+{
+    int i;
+    short tmp[4];
+    short *ip = in;
+    short *op = tmp;
+    int shortpitch = pitch >> 1;
+
+    op[0] =((ip[0]>>WHT_UPSCALE_FACTOR) + 1)>>1;
+    op[1] = op[2] = op[3] = ((ip[0]>>WHT_UPSCALE_FACTOR)>>1);
+
+
+    ip = tmp;
+    op = out;
+    for(i = 0; i<4; i++)
+    {
+        op[shortpitch*0] =(ip[0]+ 1)>>1;
+        op[shortpitch*1] = op[shortpitch*2] = op[shortpitch*3] = ip[0]>>1;
+        ip ++;
+        op ++;
+    }
+}
+
+void vp8_dc_only_inv_walsh_add_c(short input_dc, unsigned char *pred_ptr, unsigned char *dst_ptr, int pitch, int stride)
+{
+    int r, c;
+    short tmp[16];
+    vp8_short_inv_walsh4x4_1_x8_c( &input_dc, tmp, 4<<1);
+
+    for (r = 0; r < 4; r++)
+        {
+          for (c = 0; c < 4; c++)
+            {
+                int a = tmp[r*4 + c] + pred_ptr[c] ;
+                if (a < 0)
+                    a = 0;
+
+                if (a > 255)
+                    a = 255;
+
+                dst_ptr[c] = (unsigned char) a ;
+            }
+
+            dst_ptr += stride;
+            pred_ptr += pitch;
+        }
+}
+#endif
 
 void vp8_dc_only_idct_add_8x8_c(short input_dc,
                                 unsigned char *pred_ptr,

diff --git a/vp8/common/onyx.h b/vp8/common/onyx.h
index 574c8bf..8d4cb3e 100644 (file)
--- a/vp8/common/onyx.h
+++ b/vp8/common/onyx.h
@@ -153,6 +153,7 @@ extern "C"
         int worst_allowed_q;
         int best_allowed_q;
         int cq_level;
+        int lossless;
 
         // two pass datarate control
         int two_pass_vbrbias;        // two pass datarate control tweaks

diff --git a/vp8/decoder/decodframe.c b/vp8/decoder/decodframe.c
index cb1f6d1..4d6ebbe 100644 (file)
--- a/vp8/decoder/decodframe.c
+++ b/vp8/decoder/decodframe.c
@@ -140,6 +140,35 @@ void mb_init_dequantizer(VP8D_COMP *pbi, MACROBLOCKD *xd)
         xd->block[i].dequant = pc->Y1dequant[QIndex];
     }
 
+#if CONFIG_LOSSLESS
+    if(!QIndex)
+    {
+      pbi->common.rtcd.idct.idct1        = vp8_short_inv_walsh4x4_1_x8_c;
+      pbi->common.rtcd.idct.idct16       = vp8_short_inv_walsh4x4_x8_c;
+      pbi->common.rtcd.idct.idct1_scalar_add  = vp8_dc_only_inv_walsh_add_c;
+      pbi->common.rtcd.idct.iwalsh1      = vp8_short_inv_walsh4x4_1_lossless_c;
+      pbi->common.rtcd.idct.iwalsh16     = vp8_short_inv_walsh4x4_lossless_c;
+      pbi->dequant.idct_add            = vp8_dequant_idct_add_lossless_c;
+      pbi->dequant.dc_idct_add         = vp8_dequant_dc_idct_add_lossless_c;
+      pbi->dequant.dc_idct_add_y_block = vp8_dequant_dc_idct_add_y_block_lossless_c;
+      pbi->dequant.idct_add_y_block    = vp8_dequant_idct_add_y_block_lossless_c;
+      pbi->dequant.idct_add_uv_block   = vp8_dequant_idct_add_uv_block_lossless_c;
+    }
+    else
+    {
+      pbi->common.rtcd.idct.idct1        = vp8_short_idct4x4llm_1_c;
+      pbi->common.rtcd.idct.idct16       = vp8_short_idct4x4llm_c;
+      pbi->common.rtcd.idct.idct1_scalar_add  = vp8_dc_only_idct_add_c;
+      pbi->common.rtcd.idct.iwalsh1      = vp8_short_inv_walsh4x4_1_c;
+      pbi->common.rtcd.idct.iwalsh16     = vp8_short_inv_walsh4x4_c;
+      pbi->dequant.idct_add            = vp8_dequant_idct_add_c;
+      pbi->dequant.dc_idct_add         = vp8_dequant_dc_idct_add_c;
+      pbi->dequant.dc_idct_add_y_block = vp8_dequant_dc_idct_add_y_block_c;
+      pbi->dequant.idct_add_y_block    = vp8_dequant_idct_add_y_block_c;
+      pbi->dequant.idct_add_uv_block   = vp8_dequant_idct_add_uv_block_c;
+    }
+#endif
+
     for (i = 16; i < 24; i++)
     {
         xd->block[i].dequant = pc->UVdequant[QIndex];

diff --git a/vp8/decoder/dequantize.c b/vp8/decoder/dequantize.c
index f830327..a6247b2 100644 (file)
--- a/vp8/decoder/dequantize.c
+++ b/vp8/decoder/dequantize.c
@@ -20,6 +20,11 @@ extern void vp8_short_idct4x4llm_1_c(short *input, short *output, int pitch);
 extern void vp8_short_idct8x8_c(short *input, short *output, int pitch);
 extern void vp8_short_idct8x8_1_c(short *input, short *output, int pitch);
 
+#if CONFIG_LOSSLESS
+extern void vp8_short_inv_walsh4x4_x8_c(short *input, short *output, int pitch);
+extern void vp8_short_inv_walsh4x4_1_x8_c(short *input, short *output, int pitch);
+#endif
+
 #ifdef DEC_DEBUG
 extern int dec_debug;
 #endif
@@ -119,6 +124,86 @@ void vp8_dequant_dc_idct_add_c(short *input, short *dq, unsigned char *pred,
     }
 }
 
+#if CONFIG_LOSSLESS
+void vp8_dequant_idct_add_lossless_c(short *input, short *dq, unsigned char *pred,
+                            unsigned char *dest, int pitch, int stride)
+{
+    short output[16];
+    short *diff_ptr = output;
+    int r, c;
+    int i;
+
+    for (i = 0; i < 16; i++)
+    {
+        input[i] = dq[i] * input[i];
+    }
+
+    vp8_short_inv_walsh4x4_x8_c(input, output, 4 << 1);
+
+    vpx_memset(input, 0, 32);
+
+    for (r = 0; r < 4; r++)
+    {
+        for (c = 0; c < 4; c++)
+        {
+            int a = diff_ptr[c] + pred[c];
+
+            if (a < 0)
+                a = 0;
+
+            if (a > 255)
+                a = 255;
+
+            dest[c] = (unsigned char) a;
+        }
+
+        dest += stride;
+        diff_ptr += 4;
+        pred += pitch;
+    }
+}
+
+void vp8_dequant_dc_idct_add_lossless_c(short *input, short *dq, unsigned char *pred,
+                               unsigned char *dest, int pitch, int stride,
+                               int Dc)
+{
+    int i;
+    short output[16];
+    short *diff_ptr = output;
+    int r, c;
+
+    input[0] = (short)Dc;
+
+    for (i = 1; i < 16; i++)
+    {
+        input[i] = dq[i] * input[i];
+    }
+
+    vp8_short_inv_walsh4x4_x8_c(input, output, 4 << 1);
+    vpx_memset(input, 0, 32);
+
+    for (r = 0; r < 4; r++)
+    {
+        for (c = 0; c < 4; c++)
+        {
+            int a = diff_ptr[c] + pred[c];
+
+            if (a < 0)
+                a = 0;
+
+            if (a > 255)
+                a = 255;
+
+            dest[c] = (unsigned char) a;
+        }
+
+        dest += stride;
+        diff_ptr += 4;
+        pred += pitch;
+    }
+}
+#endif
+
 void vp8_dequantize_b_2x2_c(BLOCKD *d)
 {
     int i;

diff --git a/vp8/decoder/dequantize.h b/vp8/decoder/dequantize.h
index d0f162b..af84603 100644 (file)
--- a/vp8/decoder/dequantize.h
+++ b/vp8/decoder/dequantize.h
@@ -96,6 +96,13 @@ extern prototype_dequant_idct_add_y_block(vp8_dequant_idct_add_y_block);
 #endif
 extern prototype_dequant_idct_add_uv_block(vp8_dequant_idct_add_uv_block);
 
+#if CONFIG_LOSSLESS
+extern prototype_dequant_idct_add(vp8_dequant_idct_add_lossless_c);
+extern prototype_dequant_dc_idct_add(vp8_dequant_dc_idct_add_lossless_c);
+extern prototype_dequant_dc_idct_add_y_block(vp8_dequant_dc_idct_add_y_block_lossless_c);
+extern prototype_dequant_idct_add_y_block(vp8_dequant_idct_add_y_block_lossless_c);
+extern prototype_dequant_idct_add_uv_block(vp8_dequant_idct_add_uv_block_lossless_c);
+#endif
 
 #ifndef vp8_dequant_block_2x2
 #define vp8_dequant_block_2x2 vp8_dequantize_b_2x2_c

diff --git a/vp8/decoder/idct_blk.c b/vp8/decoder/idct_blk.c
index 16ac46c..ee23130 100644 (file)
--- a/vp8/decoder/idct_blk.c
+++ b/vp8/decoder/idct_blk.c
@@ -19,6 +19,12 @@ void vp8_dequant_idct_add_c(short *input, short *dq, unsigned char *pred,
                             unsigned char *dest, int pitch, int stride);
 void vp8_dc_only_idct_add_c(short input_dc, unsigned char *pred_ptr,
                             unsigned char *dst_ptr, int pitch, int stride);
+#if CONFIG_LOSSLESS
+void vp8_dequant_idct_add_lossless_c(short *input, short *dq, unsigned char *pred,
+                            unsigned char *dest, int pitch, int stride);
+void vp8_dc_only_idct_add_lossless_c(short input_dc, unsigned char *pred_ptr,
+                            unsigned char *dst_ptr, int pitch, int stride);
+#endif
 
 void vp8_dequant_dc_idct_add_y_block_c
             (short *q, short *dq, unsigned char *pre,
@@ -164,3 +170,108 @@ void vp8_dequant_idct_add_uv_block_8x8_c
   vp8_dequant_idct_add_8x8_c (q, dq, pre, dstv, 8, stride);
 }
 
+#if CONFIG_LOSSLESS
+void vp8_dequant_dc_idct_add_y_block_lossless_c
+            (short *q, short *dq, unsigned char *pre,
+             unsigned char *dst, int stride, char *eobs, short *dc)
+{
+    int i, j;
+
+    for (i = 0; i < 4; i++)
+    {
+        for (j = 0; j < 4; j++)
+        {
+            if (*eobs++ > 1)
+                vp8_dequant_dc_idct_add_lossless_c (q, dq, pre, dst, 16, stride, dc[0]);
+            else
+                vp8_dc_only_inv_walsh_add_c(dc[0], pre, dst, 16, stride);
+
+            q   += 16;
+            pre += 4;
+            dst += 4;
+            dc  ++;
+        }
+
+        pre += 64 - 16;
+        dst += 4*stride - 16;
+    }
+}
+
+void vp8_dequant_idct_add_y_block_lossless_c
+            (short *q, short *dq, unsigned char *pre,
+             unsigned char *dst, int stride, char *eobs)
+{
+    int i, j;
+
+    for (i = 0; i < 4; i++)
+    {
+        for (j = 0; j < 4; j++)
+        {
+            if (*eobs++ > 1)
+                vp8_dequant_idct_add_lossless_c (q, dq, pre, dst, 16, stride);
+            else
+            {
+                vp8_dc_only_inv_walsh_add_c(q[0]*dq[0], pre, dst, 16, stride);
+                ((int *)q)[0] = 0;
+            }
+
+            q   += 16;
+            pre += 4;
+            dst += 4;
+        }
+
+        pre += 64 - 16;
+        dst += 4*stride - 16;
+    }
+}
+
+void vp8_dequant_idct_add_uv_block_lossless_c
+            (short *q, short *dq, unsigned char *pre,
+             unsigned char *dstu, unsigned char *dstv, int stride, char *eobs)
+{
+    int i, j;
+
+    for (i = 0; i < 2; i++)
+    {
+        for (j = 0; j < 2; j++)
+        {
+            if (*eobs++ > 1)
+                vp8_dequant_idct_add_lossless_c (q, dq, pre, dstu, 8, stride);
+            else
+            {
+                vp8_dc_only_inv_walsh_add_c(q[0]*dq[0], pre, dstu, 8, stride);
+                ((int *)q)[0] = 0;
+            }
+
+            q    += 16;
+            pre  += 4;
+            dstu += 4;
+        }
+
+        pre  += 32 - 8;
+        dstu += 4*stride - 8;
+    }
+
+    for (i = 0; i < 2; i++)
+    {
+        for (j = 0; j < 2; j++)
+        {
+            if (*eobs++ > 1)
+                vp8_dequant_idct_add_lossless_c (q, dq, pre, dstv, 8, stride);
+            else
+            {
+                vp8_dc_only_inv_walsh_add_c(q[0]*dq[0], pre, dstv, 8, stride);
+                ((int *)q)[0] = 0;
+            }
+
+            q    += 16;
+            pre  += 4;
+            dstv += 4;
+        }
+
+        pre  += 32 - 8;
+        dstv += 4*stride - 8;
+    }
+}
+#endif
+

diff --git a/vp8/encoder/dct.c b/vp8/encoder/dct.c
index 6f9c68e..568d0e0 100644 (file)
--- a/vp8/encoder/dct.c
+++ b/vp8/encoder/dct.c
@@ -11,6 +11,7 @@
 
 #include <math.h>
 #include "vpx_ports/config.h"
+#include "vp8/common/idct.h"
 
 #if CONFIG_INT_8X8FDCT
 
@@ -457,4 +458,98 @@ void vp8_short_walsh4x4_c(short *input, short *output, int pitch)
         ip += 4;
         op += 4;
     }
-}
\ No newline at end of file
+}
+
+#if CONFIG_LOSSLESS
+void vp8_short_walsh4x4_lossless_c(short *input, short *output, int pitch)
+{
+    int i;
+    int a1, b1, c1, d1;
+    short *ip = input;
+    short *op = output;
+    int pitch_short = pitch >>1;
+
+    for (i = 0; i < 4; i++)
+    {
+        a1 = (ip[0 * pitch_short] + ip[3 * pitch_short])>>Y2_WHT_UPSCALE_FACTOR;
+        b1 = (ip[1 * pitch_short] + ip[2 * pitch_short])>>Y2_WHT_UPSCALE_FACTOR;
+        c1 = (ip[1 * pitch_short] - ip[2 * pitch_short])>>Y2_WHT_UPSCALE_FACTOR;
+        d1 = (ip[0 * pitch_short] - ip[3 * pitch_short])>>Y2_WHT_UPSCALE_FACTOR;
+
+        op[0] = (a1 + b1 + 1)>>1;
+        op[4] = (c1 + d1)>>1;
+        op[8] = (a1 - b1)>>1;
+        op[12]= (d1 - c1)>>1;
+
+        ip++;
+        op++;
+    }
+    ip = output;
+    op = output;
+
+    for (i = 0; i < 4; i++)
+    {
+        a1 = ip[0] + ip[3];
+        b1 = ip[1] + ip[2];
+        c1 = ip[1] - ip[2];
+        d1 = ip[0] - ip[3];
+
+        op[0] = ((a1 + b1 + 1)>>1)<<Y2_WHT_UPSCALE_FACTOR;
+        op[1] = ((c1 + d1)>>1)<<Y2_WHT_UPSCALE_FACTOR;
+        op[2] = ((a1 - b1)>>1)<<Y2_WHT_UPSCALE_FACTOR;
+        op[3] = ((d1 - c1)>>1)<<Y2_WHT_UPSCALE_FACTOR;
+
+        ip += 4;
+        op += 4;
+    }
+}
+
+void vp8_short_walsh4x4_x8_c(short *input, short *output, int pitch)
+{
+    int i;
+    int a1, b1, c1, d1;
+    short *ip = input;
+    short *op = output;
+    int pitch_short = pitch >>1;
+
+    for (i = 0; i < 4; i++)
+    {
+        a1 = ip[0 * pitch_short] + ip[3 * pitch_short];
+        b1 = ip[1 * pitch_short] + ip[2 * pitch_short];
+        c1 = ip[1 * pitch_short] - ip[2 * pitch_short];
+        d1 = ip[0 * pitch_short] - ip[3 * pitch_short];
+
+        op[0] = (a1 + b1 +1)>>1;
+        op[4] = (c1 + d1)>>1;
+        op[8] = (a1 - b1)>>1;
+        op[12]= (d1 - c1)>>1;
+
+        ip++;
+        op++;
+    }
+    ip = output;
+    op = output;
+
+    for (i = 0; i < 4; i++)
+    {
+        a1 = ip[0] + ip[3];
+        b1 = ip[1] + ip[2];
+        c1 = ip[1] - ip[2];
+        d1 = ip[0] - ip[3];
+
+        op[0] = ((a1 + b1 +1)>>1)<<WHT_UPSCALE_FACTOR;
+        op[1] = ((c1 + d1)>>1)<<WHT_UPSCALE_FACTOR;
+        op[2] = ((a1 - b1)>>1)<<WHT_UPSCALE_FACTOR;
+        op[3] = ((d1 - c1)>>1)<<WHT_UPSCALE_FACTOR;
+
+        ip += 4;
+        op += 4;
+    }
+}
+
+void vp8_short_walsh8x4_x8_c(short *input, short *output, int pitch)
+{
+  vp8_short_walsh4x4_x8_c(input,   output,    pitch);
+  vp8_short_walsh4x4_x8_c(input + 4, output + 16, pitch);
+}
+#endif

diff --git a/vp8/encoder/dct.h b/vp8/encoder/dct.h
index 7ab525c..2a059a0 100644 (file)
--- a/vp8/encoder/dct.h
+++ b/vp8/encoder/dct.h
@@ -59,6 +59,12 @@ extern prototype_fdct(vp8_fdct_short8x4);
 #endif
 extern prototype_fdct(vp8_fdct_walsh_short4x4);
 
+#if CONFIG_LOSSLESS
+extern prototype_fdct(vp8_short_walsh4x4_x8_c);
+extern prototype_fdct(vp8_short_walsh8x4_x8_c);
+extern prototype_fdct(vp8_short_walsh4x4_lossless_c);
+#endif
+
 typedef prototype_fdct(*vp8_fdct_fn_t);
 typedef struct
 {

diff --git a/vp8/encoder/onyx_if.c b/vp8/encoder/onyx_if.c
index ccb2cb7..bfcaf74 100644 (file)
--- a/vp8/encoder/onyx_if.c
+++ b/vp8/encoder/onyx_if.c
@@ -727,7 +727,11 @@ void vp8_set_speed_features(VP8_COMP *cpi)
     sf->quarter_pixel_search = 1;
     sf->half_pixel_search = 1;
     sf->iterative_sub_pixel = 1;
+#if CONFIG_LOSSLESS
+    sf->optimize_coefficients = 0;
+#else
     sf->optimize_coefficients = 1;
+#endif
     sf->no_skip_block4x4_search = 1;
 
     sf->first_step = 0;
@@ -1587,6 +1591,23 @@ void vp8_change_config(VP8_PTR ptr, VP8_CONFIG *oxcf)
     cpi->oxcf.best_allowed_q = q_trans[oxcf->best_allowed_q];
     cpi->oxcf.cq_level = q_trans[cpi->oxcf.cq_level];
 
+#if CONFIG_LOSSLESS
+    cpi->oxcf.lossless = oxcf->lossless;
+    if(cpi->oxcf.lossless)
+    {
+      cpi->rtcd.fdct.short4x4                  = vp8_short_walsh4x4_x8_c;
+      cpi->rtcd.fdct.fast4x4                   = vp8_short_walsh4x4_x8_c;
+      cpi->rtcd.fdct.short8x4                  = vp8_short_walsh8x4_x8_c;
+      cpi->rtcd.fdct.fast8x4                   = vp8_short_walsh8x4_x8_c;
+      cpi->rtcd.fdct.walsh_short4x4            = vp8_short_walsh4x4_lossless_c;
+      cpi->common.rtcd.idct.idct1        = vp8_short_inv_walsh4x4_1_x8_c;
+      cpi->common.rtcd.idct.idct16       = vp8_short_inv_walsh4x4_x8_c;
+      cpi->common.rtcd.idct.idct1_scalar_add  = vp8_dc_only_inv_walsh_add_c;
+      cpi->common.rtcd.idct.iwalsh1      = vp8_short_inv_walsh4x4_1_c;
+      cpi->common.rtcd.idct.iwalsh16     = vp8_short_inv_walsh4x4_lossless_c;
+    }
+#endif
+
     cpi->baseline_gf_interval = DEFAULT_GF_INTERVAL;
 
     cpi->ref_frame_flags = VP8_ALT_FLAG | VP8_GOLD_FLAG | VP8_LAST_FLAG;
@@ -2984,6 +3005,12 @@ void loopfilter_frame(VP8_COMP *cpi, VP8_COMMON *cm)
     {
         cm->filter_level = 0;
     }
+#if CONFIG_LOSSLESS
+    else if(cpi->oxcf.lossless)
+    {
+        cm->filter_level = 0;
+    }
+#endif
     else
     {
         struct vpx_usec_timer timer;
@@ -3139,7 +3166,11 @@ static void encode_frame_to_data_rate
     // For 2 Pass Only used where GF/ARF prediction quality
     // is above a threshold
     cpi->zbin_mode_boost = 0;
+#if CONFIG_LOSSLESS
+    cpi->zbin_mode_boost_enabled = FALSE;
+#else
     cpi->zbin_mode_boost_enabled = TRUE;
+#endif
     if ( cpi->gfu_boost <= 400 )
     {
         cpi->zbin_mode_boost_enabled = FALSE;

diff --git a/vp8/encoder/quantize.c b/vp8/encoder/quantize.c
index c0b1be3..dace31c 100644 (file)
--- a/vp8/encoder/quantize.c
+++ b/vp8/encoder/quantize.c
@@ -313,6 +313,17 @@ void vp8cx_init_quantizer(VP8_COMP *cpi)
     {
         int qzbin_factor = (vp8_dc_quant(Q,0) < 148) ? 84 : 80;
 
+#if CONFIG_LOSSLESS
+        if(cpi->oxcf.lossless)
+        {
+            if (Q==0)
+            {
+                qzbin_factor = 64;
+                qrounding_factor = 64;
+            }
+        }
+#endif
+
         // dc values
         quant_val = vp8_dc_quant(Q, cpi->common.y1dc_delta_q);
         invert_quant(cpi->Y1quant[Q] + 0,

diff --git a/vp8/encoder/ratectrl.c b/vp8/encoder/ratectrl.c
index 5ea7445..52424aa 100644 (file)
--- a/vp8/encoder/ratectrl.c
+++ b/vp8/encoder/ratectrl.c
@@ -264,6 +264,10 @@ void vp8_setup_key_frame(VP8_COMP *cpi)
 
     cpi->common.txfm_mode = ALLOW_8X8;
 
+#if CONFIG_LOSSLESS
+    if(cpi->oxcf.lossless)
+        cpi->common.txfm_mode = ONLY_4X4;
+#endif
     //cpi->common.filter_level = 0;      // Reset every key frame.
     cpi->common.filter_level = cpi->common.base_qindex * 3 / 8 ;
 
@@ -292,6 +296,11 @@ void vp8_setup_inter_frame(VP8_COMP *cpi)
 
     cpi->common.txfm_mode = ALLOW_8X8;
 
+#if CONFIG_LOSSLESS
+    if(cpi->oxcf.lossless)
+        cpi->common.txfm_mode = ONLY_4X4;
+#endif
+
     if(cpi->common.refresh_alt_ref_frame)
     {
         vpx_memcpy( &cpi->common.fc,

diff --git a/vp8/vp8_cx_iface.c b/vp8/vp8_cx_iface.c
index 96dcedc..be32c37 100644 (file)
--- a/vp8/vp8_cx_iface.c
+++ b/vp8/vp8_cx_iface.c
@@ -317,6 +317,10 @@ static vpx_codec_err_t set_vp8e_config(VP8_CONFIG *oxcf,
 
     oxcf->tuning = vp8_cfg.tuning;
 
+#if CONFIG_LOSSLESS
+    oxcf->lossless = cfg.lossless;
+#endif
+
     /*
         printf("Current VP8 Settings: \n");
         printf("target_bandwidth: %d\n", oxcf->target_bandwidth);

diff --git a/vpx/vpx_encoder.h b/vpx/vpx_encoder.h
index 4863dcd..971a436 100644 (file)
--- a/vpx/vpx_encoder.h
+++ b/vpx/vpx_encoder.h
@@ -592,6 +592,12 @@ extern "C" {
          */
         unsigned int           kf_max_dist;
 
+
+        /*!\brief Enable lossless compression mode
+         *
+         * If this flag is set, the decoder will be in lossless compression mode.
+         */
+        unsigned int           lossless;
     } vpx_codec_enc_cfg_t; /**< alias for struct vpx_codec_enc_cfg */
 
 

diff --git a/vpxenc.c b/vpxenc.c
index 94235f4..e4b4422 100644 (file)
--- a/vpxenc.c
+++ b/vpxenc.c
@@ -966,6 +966,10 @@ static const arg_def_t q_hist_n         = ARG_DEF(NULL, "q-hist", 1,
         "Show quantizer histogram (n-buckets)");
 static const arg_def_t rate_hist_n         = ARG_DEF(NULL, "rate-hist", 1,
         "Show rate histogram (n-buckets)");
+#if CONFIG_LOSSLESS
+static const arg_def_t lossless_enabled = ARG_DEF(NULL, "lossless", 0,
+                                   "Enable lossless compression");
+#endif
 static const arg_def_t *main_args[] =
 {
     &debugmode,
@@ -973,6 +977,9 @@ static const arg_def_t *main_args[] =
     &deadline,
     &best_dl, &good_dl, &rt_dl,
     &verbosearg, &psnrarg, &recontest, &use_ivf, &q_hist_n, &rate_hist_n,
+#if CONFIG_LOSSLESS
+    &lossless_enabled,
+#endif
     NULL
 };
 
@@ -1670,6 +1677,10 @@ int main(int argc, const char **argv_)
     cfg.g_w = 0;
     cfg.g_h = 0;
 
+#if CONFIG_LOSSLESS
+    cfg.lossless = 0;
+#endif
+
     /* Now parse the remainder of the parameters. */
     for (argi = argj = argv; (*argj = *argi); argi += arg.argv_step)
     {
@@ -1753,10 +1764,22 @@ int main(int argc, const char **argv_)
             cfg.kf_max_dist = arg_parse_uint(&arg);
         else if (arg_match(&arg, &kf_disabled, argi))
             cfg.kf_mode = VPX_KF_DISABLED;
+#if CONFIG_LOSSLESS
+        else if (arg_match(&arg, &lossless_enabled, argi))
+            cfg.lossless = 1;
+#endif
         else
             argj++;
     }
 
+#if CONFIG_LOSSLESS
+        if (cfg.lossless)
+        {
+            cfg.rc_min_quantizer = 0;
+            cfg.rc_max_quantizer = 0;
+        }
+#endif
+
     /* Handle codec specific options */
 #if CONFIG_VP8_ENCODER
 
@@ -1929,6 +1952,9 @@ int main(int argc, const char **argv_)
             SHOW(kf_mode);
             SHOW(kf_min_dist);
             SHOW(kf_max_dist);
+#if CONFIG_LOSSLESS
+            SHOW(lossless);
+#endif
         }
 
         if(pass == (one_pass_only ? one_pass_only - 1 : 0)) {