Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

1 files changed, 256 insertions, 0 deletions

diff --git a/third_party/aom/av1/common/partition.c b/third_party/aom/av1/common/partition.c
new file mode 100644
index 000000000..634a9edd5
--- /dev/null
+++ b/third_party/aom/av1/common/partition.c
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+/*
+ * Copyright (c) 2001-2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+/* clang-format off */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "enums.h"
+#include "odintrin.h"
+#include "partition.h"
+#include "zigzag.h"
+
+OD_EXTERN const index_pair *OD_ZIGZAG4[4] = {
+  OD_ZIGZAG4_DCT_DCT,
+  OD_ZIGZAG4_ADST_DCT,
+  OD_ZIGZAG4_DCT_ADST,
+  OD_ZIGZAG4_ADST_ADST
+};
+
+OD_EXTERN const index_pair *OD_ZIGZAG8[4] = {
+  OD_ZIGZAG8_DCT_DCT,
+  OD_ZIGZAG8_ADST_DCT,
+  OD_ZIGZAG8_DCT_ADST,
+  OD_ZIGZAG8_ADST_ADST
+};
+
+OD_EXTERN const index_pair *OD_ZIGZAG16[4] = {
+  OD_ZIGZAG16_DCT_DCT,
+  OD_ZIGZAG16_ADST_DCT,
+  OD_ZIGZAG16_DCT_ADST,
+  OD_ZIGZAG16_ADST_ADST
+};
+
+OD_EXTERN const index_pair *OD_ZIGZAG32[4] = {
+  OD_ZIGZAG32_DCT_DCT,
+  OD_ZIGZAG32_DCT_DCT,
+  OD_ZIGZAG32_DCT_DCT,
+  OD_ZIGZAG32_DCT_DCT
+};
+
+/* The tables below specify how coefficient blocks are translated to
+   and from PVQ partition coding scan order for 4x4, 8x8 and 16x16 */
+
+static const int OD_LAYOUT32_OFFSETS[4] = { 0, 128, 256, 768 };
+const band_layout OD_LAYOUT32 = {
+  OD_ZIGZAG32,
+  32,
+  3,
+  OD_LAYOUT32_OFFSETS
+};
+
+static const int OD_LAYOUT16_OFFSETS[4] = { 0, 32, 64, 192 };
+const band_layout OD_LAYOUT16 = {
+  OD_ZIGZAG16,
+  16,
+  3,
+  OD_LAYOUT16_OFFSETS
+};
+
+const int OD_LAYOUT8_OFFSETS[4] = { 0, 8, 16, 48 };
+const band_layout OD_LAYOUT8 = {
+  OD_ZIGZAG8,
+  8,
+  3,
+  OD_LAYOUT8_OFFSETS
+};
+
+static const int OD_LAYOUT4_OFFSETS[2] = { 0, 15 };
+const band_layout OD_LAYOUT4 = {
+  OD_ZIGZAG4,
+  4,
+  1,
+  OD_LAYOUT4_OFFSETS
+};
+
+/* First element is the number of bands, followed by the list all the band
+  boundaries. */
+static const int OD_BAND_OFFSETS4[] = {1, 1, 16};
+static const int OD_BAND_OFFSETS8[] = {4, 1, 16, 24, 32, 64};
+static const int OD_BAND_OFFSETS16[] = {7, 1, 16, 24, 32, 64, 96, 128, 256};
+static const int OD_BAND_OFFSETS32[] = {10, 1, 16, 24, 32, 64, 96, 128, 256,
+ 384, 512, 1024};
+static const int OD_BAND_OFFSETS64[] = {13, 1, 16, 24, 32, 64, 96, 128, 256,
+ 384, 512, 1024, 1536, 2048, 4096};
+
+const int *const OD_BAND_OFFSETS[OD_TXSIZES + 1] = {
+  OD_BAND_OFFSETS4,
+  OD_BAND_OFFSETS8,
+  OD_BAND_OFFSETS16,
+  OD_BAND_OFFSETS32,
+  OD_BAND_OFFSETS64
+};
+
+/** Perform a single stage of conversion from a coefficient block in
+ * raster order into coding scan order
+ *
+ * @param [in]     layout  scan order specification
+ * @param [out]    dst     destination vector
+ * @param [in]     src     source coefficient block
+ * @param [int]    int     source vector row stride
+ */
+static void od_band_from_raster(const band_layout *layout, tran_low_t *dst,
+ const tran_low_t *src, int stride, TX_TYPE tx_type) {
+  int i;
+  int len;
+  len = layout->band_offsets[layout->nb_bands];
+  for (i = 0; i < len; i++) {
+    dst[i] = src[layout->dst_table[tx_type][i][1]*stride + layout->dst_table[tx_type][i][0]];
+  }
+}
+
+/** Perform a single stage of conversion from a vector in coding scan
+    order back into a coefficient block in raster order
+ *
+ * @param [in]     layout  scan order specification
+ * @param [out]    dst     destination coefficient block
+ * @param [in]     src     source vector
+ * @param [int]    stride  destination vector row stride
+ */
+static void od_raster_from_band(const band_layout *layout, tran_low_t *dst,
+ int stride, TX_TYPE tx_type, const tran_low_t *src) {
+  int i;
+  int len;
+  len = layout->band_offsets[layout->nb_bands];
+  for (i = 0; i < len; i++) {
+    dst[layout->dst_table[tx_type][i][1]*stride + layout->dst_table[tx_type][i][0]] = src[i];
+  }
+}
+
+static const band_layout *const OD_LAYOUTS[] = {&OD_LAYOUT4, &OD_LAYOUT8,
+ &OD_LAYOUT16, &OD_LAYOUT32};
+
+/** Converts a coefficient block in raster order into a vector in
+ * coding scan order with the PVQ partitions laid out one after
+ * another.  This works in stages; the 4x4 conversion is applied to
+ * the coefficients nearest DC, then the 8x8 applied to the 8x8 block
+ * nearest DC that was not already coded by 4x4, then 16x16 following
+ * the same pattern.
+ *
+ * @param [out]    dst        destination vector
+ * @param [in]     n          block size (along one side)
+ * @param [in]     ty_type    transfrom type
+ * @param [in]     src        source coefficient block
+ * @param [in]     stride     source vector row stride
+ */
+void od_raster_to_coding_order(tran_low_t *dst, int n, TX_TYPE ty_type,
+ const tran_low_t *src, int stride) {
+  int bs;
+  /* dst + 1 because DC is not included for 4x4 blocks. */
+  od_band_from_raster(OD_LAYOUTS[0], dst + 1, src, stride, ty_type);
+  for (bs = 1; bs < OD_TXSIZES; bs++) {
+    int size;
+    int offset;
+    /* Length of block size > 4. */
+    size = 1 << (OD_LOG_BSIZE0 + bs);
+    /* Offset is the size of the previous block squared. */
+    offset = 1 << 2*(OD_LOG_BSIZE0 - 1 + bs);
+    if (n >= size) {
+      /* 3 16x16 bands come after 3 8x8 bands, which come after 2 4x4 bands. */
+      od_band_from_raster(OD_LAYOUTS[bs], dst + offset, src, stride, ty_type);
+    }
+  }
+  dst[0] = src[0];
+}
+
+/** Converts a vector in coding scan order witht he PVQ partitions
+ * laid out one after another into a coefficient block in raster
+ * order. This works in stages in the reverse order of raster->scan
+ * order; the 16x16 conversion is applied to the coefficients that
+ * don't appear in an 8x8 block, then the 8x8 applied to the 8x8 block
+ * sans the 4x4 block it contains, then 4x4 is converted sans DC.
+ *
+ * @param [out]    dst        destination coefficient block
+ * @param [in]     stride     destination vector row stride
+ * @param [in]     src        source vector
+ * @param [in]     n          block size (along one side)
+ */
+void od_coding_order_to_raster(tran_low_t *dst, int stride, TX_TYPE ty_type,
+ const tran_low_t *src, int n) {
+  int bs;
+  /* src + 1 because DC is not included for 4x4 blocks. */
+  od_raster_from_band(OD_LAYOUTS[0], dst, stride, ty_type, src + 1);
+  for (bs = 1; bs < OD_TXSIZES; bs++) {
+    int size;
+    int offset;
+    /* Length of block size > 4 */
+    size = 1 << (OD_LOG_BSIZE0 + bs);
+    /* Offset is the size of the previous block squared. */
+    offset = 1 << 2*(OD_LOG_BSIZE0 - 1 + bs);
+    if (n >= size) {
+      /* 3 16x16 bands come after 3 8x8 bands, which come after 2 4x4 bands. */
+      od_raster_from_band(OD_LAYOUTS[bs], dst, stride, ty_type, src + offset);
+    }
+  }
+  dst[0] = src[0];
+}
+
+/** Perform a single stage of conversion from a coefficient block in
+ * raster order into coding scan order
+ *
+ * @param [in]     layout  scan order specification
+ * @param [out]    dst     destination vector
+ * @param [in]     src     source coefficient block
+ * @param [int]    int     source vector row stride
+ */
+static void od_band_from_raster_16(const band_layout *layout, int16_t *dst,
+ const int16_t *src, int stride) {
+  int i;
+  int len;
+  len = layout->band_offsets[layout->nb_bands];
+  for (i = 0; i < len; i++) {
+    dst[i] = src[layout->dst_table[DCT_DCT][i][1]*stride + layout->dst_table[DCT_DCT][i][0]];
+  }
+}
+
+/** Converts a coefficient block in raster order into a vector in
+ * coding scan order with the PVQ partitions laid out one after
+ * another.  This works in stages; the 4x4 conversion is applied to
+ * the coefficients nearest DC, then the 8x8 applied to the 8x8 block
+ * nearest DC that was not already coded by 4x4, then 16x16 following
+ * the same pattern.
+ *
+ * @param [out]    dst        destination vector
+ * @param [in]     n          block size (along one side)
+ * @param [in]     src        source coefficient block
+ * @param [in]     stride     source vector row stride
+ */
+void od_raster_to_coding_order_16(int16_t *dst, int n, const int16_t *src,
+ int stride) {
+  int bs;
+  /* dst + 1 because DC is not included for 4x4 blocks. */
+  od_band_from_raster_16(OD_LAYOUTS[0], dst + 1, src, stride);
+  for (bs = 1; bs < OD_TXSIZES; bs++) {
+    int size;
+    int offset;
+    /* Length of block size > 4. */
+    size = 1 << (OD_LOG_BSIZE0 + bs);
+    /* Offset is the size of the previous block squared. */
+    offset = 1 << 2*(OD_LOG_BSIZE0 - 1 + bs);
+    if (n >= size) {
+      /* 3 16x16 bands come after 3 8x8 bands, which come after 2 4x4 bands. */
+      od_band_from_raster_16(OD_LAYOUTS[bs], dst + offset, src, stride);
+    }
+  }
+  dst[0] = src[0];
+}