libvpx: Add VP9 decoder.

source/libvpx/vp9/common/vp9_invtrans.c

+/*
+ *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "vp9/common/vp9_invtrans.h"
+#include "./vp9_rtcd.h"
+
+static void recon_dcblock(MACROBLOCKD *xd) {
+  BLOCKD *b = &xd->block[24];
+  int i;
+
+  for (i = 0; i < 16; i++) {
+    xd->block[i].dqcoeff[0] = b->diff[i];
+  }
+}
+
+static void recon_dcblock_8x8(MACROBLOCKD *xd) {
+  BLOCKD *b = &xd->block[24]; // for coeff 0, 2, 8, 10
+
+  xd->block[0].dqcoeff[0] = b->diff[0];
+  xd->block[4].dqcoeff[0] = b->diff[1];
+  xd->block[8].dqcoeff[0] = b->diff[4];
+  xd->block[12].dqcoeff[0] = b->diff[8];
+}
+
+void vp9_inverse_transform_b_4x4(MACROBLOCKD *xd, int block, int pitch) {
+  BLOCKD *b = &xd->block[block];
+  if (b->eob <= 1)
+    xd->inv_xform4x4_1_x8(b->dqcoeff, b->diff, pitch);
+  else
+    xd->inv_xform4x4_x8(b->dqcoeff, b->diff, pitch);
+}
+
+void vp9_inverse_transform_mby_4x4(MACROBLOCKD *xd) {
+  int i;
+  BLOCKD *blockd = xd->block;
+  int has_2nd_order = get_2nd_order_usage(xd);
+
+  if (has_2nd_order) {
+    /* do 2nd order transform on the dc block */
+    vp9_short_inv_walsh4x4(blockd[24].dqcoeff, blockd[24].diff);
+    recon_dcblock(xd);
+  }
+
+  for (i = 0; i < 16; i++) {
+    TX_TYPE tx_type = get_tx_type_4x4(xd, &xd->block[i]);
+    if (tx_type != DCT_DCT) {
+      vp9_ihtllm(xd->block[i].dqcoeff, xd->block[i].diff, 32,
+                   tx_type, 4);
+    } else {
+      vp9_inverse_transform_b_4x4(xd, i, 32);
+    }
+  }
+}
+
+void vp9_inverse_transform_mbuv_4x4(MACROBLOCKD *xd) {
+  int i;
+
+  for (i = 16; i < 24; i++) {
+    vp9_inverse_transform_b_4x4(xd, i, 16);
+  }
+}
+
+void vp9_inverse_transform_mb_4x4(MACROBLOCKD *xd) {
+  vp9_inverse_transform_mby_4x4(xd);
+  vp9_inverse_transform_mbuv_4x4(xd);
+}
+
+void vp9_inverse_transform_b_8x8(short *input_dqcoeff, short *output_coeff,
+                                 int pitch) {
+  vp9_short_idct8x8(input_dqcoeff, output_coeff, pitch);
+}
+
+void vp9_inverse_transform_mby_8x8(MACROBLOCKD *xd) {
+  int i;
+  BLOCKD *blockd = xd->block;
+  int has_2nd_order = get_2nd_order_usage(xd);
+
+  if (has_2nd_order) {
+    // do 2nd order transform on the dc block
+    vp9_short_ihaar2x2(blockd[24].dqcoeff, blockd[24].diff, 8);
+    recon_dcblock_8x8(xd); // need to change for 8x8
+  }
+
+  for (i = 0; i < 9; i += 8) {
+    TX_TYPE tx_type = get_tx_type_8x8(xd, &xd->block[i]);
+    if (tx_type != DCT_DCT) {
+      vp9_ihtllm(xd->block[i].dqcoeff, xd->block[i].diff, 32, tx_type, 8);
+    } else {
+      vp9_inverse_transform_b_8x8(&blockd[i].dqcoeff[0],
+                                  &blockd[i].diff[0], 32);
+    }
+  }
+  for (i = 2; i < 11; i += 8) {
+    TX_TYPE tx_type = get_tx_type_8x8(xd, &xd->block[i]);
+    if (tx_type != DCT_DCT) {
+      vp9_ihtllm(xd->block[i + 2].dqcoeff, xd->block[i].diff, 32, tx_type, 8);
+    } else {
+      vp9_inverse_transform_b_8x8(&blockd[i + 2].dqcoeff[0],
+                                  &blockd[i].diff[0], 32);
+    }
+  }
+}
+
+void vp9_inverse_transform_mbuv_8x8(MACROBLOCKD *xd) {
+  int i;
+  BLOCKD *blockd = xd->block;
+
+  for (i = 16; i < 24; i += 4) {
+    vp9_inverse_transform_b_8x8(&blockd[i].dqcoeff[0],
+                                &blockd[i].diff[0], 16);
+  }
+}
+
+void vp9_inverse_transform_mb_8x8(MACROBLOCKD *xd) {
+  vp9_inverse_transform_mby_8x8(xd);
+  vp9_inverse_transform_mbuv_8x8(xd);
+}
+
+void vp9_inverse_transform_b_16x16(short *input_dqcoeff,
+                                   short *output_coeff, int pitch) {
+  vp9_short_idct16x16(input_dqcoeff, output_coeff, pitch);
+}
+
+void vp9_inverse_transform_mby_16x16(MACROBLOCKD *xd) {
+  BLOCKD *bd = &xd->block[0];
+  TX_TYPE tx_type = get_tx_type_16x16(xd, bd);
+  if (tx_type != DCT_DCT) {
+    vp9_ihtllm(bd->dqcoeff, bd->diff, 32, tx_type, 16);
+  } else {
+    vp9_inverse_transform_b_16x16(&xd->block[0].dqcoeff[0],
+                                  &xd->block[0].diff[0], 32);
+  }
+}
+
+void vp9_inverse_transform_mb_16x16(MACROBLOCKD *xd) {
+  vp9_inverse_transform_mby_16x16(xd);
+  vp9_inverse_transform_mbuv_8x8(xd);
+}