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-rw-r--r--media/libaom/src/av1/common/txb_common.h424
1 files changed, 424 insertions, 0 deletions
diff --git a/media/libaom/src/av1/common/txb_common.h b/media/libaom/src/av1/common/txb_common.h
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+++ b/media/libaom/src/av1/common/txb_common.h
@@ -0,0 +1,424 @@
+/*
+ * Copyright (c) 2017, 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.
+ */
+
+#ifndef AOM_AV1_COMMON_TXB_COMMON_H_
+#define AOM_AV1_COMMON_TXB_COMMON_H_
+
+extern const int16_t k_eob_group_start[12];
+extern const int16_t k_eob_offset_bits[12];
+
+extern const int8_t av1_coeff_band_4x4[16];
+
+extern const int8_t av1_coeff_band_8x8[64];
+
+extern const int8_t av1_coeff_band_16x16[256];
+
+extern const int8_t av1_coeff_band_32x32[1024];
+
+extern const int8_t *av1_nz_map_ctx_offset[TX_SIZES_ALL];
+
+typedef struct txb_ctx {
+ int txb_skip_ctx;
+ int dc_sign_ctx;
+} TXB_CTX;
+
+static const int base_level_count_to_index[13] = {
+ 0, 0, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,
+};
+
+static const TX_CLASS tx_type_to_class[TX_TYPES] = {
+ TX_CLASS_2D, // DCT_DCT
+ TX_CLASS_2D, // ADST_DCT
+ TX_CLASS_2D, // DCT_ADST
+ TX_CLASS_2D, // ADST_ADST
+ TX_CLASS_2D, // FLIPADST_DCT
+ TX_CLASS_2D, // DCT_FLIPADST
+ TX_CLASS_2D, // FLIPADST_FLIPADST
+ TX_CLASS_2D, // ADST_FLIPADST
+ TX_CLASS_2D, // FLIPADST_ADST
+ TX_CLASS_2D, // IDTX
+ TX_CLASS_VERT, // V_DCT
+ TX_CLASS_HORIZ, // H_DCT
+ TX_CLASS_VERT, // V_ADST
+ TX_CLASS_HORIZ, // H_ADST
+ TX_CLASS_VERT, // V_FLIPADST
+ TX_CLASS_HORIZ, // H_FLIPADST
+};
+
+static INLINE int get_txb_bwl(TX_SIZE tx_size) {
+ tx_size = av1_get_adjusted_tx_size(tx_size);
+ return tx_size_wide_log2[tx_size];
+}
+
+static INLINE int get_txb_wide(TX_SIZE tx_size) {
+ tx_size = av1_get_adjusted_tx_size(tx_size);
+ return tx_size_wide[tx_size];
+}
+
+static INLINE int get_txb_high(TX_SIZE tx_size) {
+ tx_size = av1_get_adjusted_tx_size(tx_size);
+ return tx_size_high[tx_size];
+}
+
+static INLINE uint8_t *set_levels(uint8_t *const levels_buf, const int width) {
+ return levels_buf + TX_PAD_TOP * (width + TX_PAD_HOR);
+}
+
+static INLINE int get_padded_idx(const int idx, const int bwl) {
+ return idx + ((idx >> bwl) << TX_PAD_HOR_LOG2);
+}
+
+static INLINE int get_base_ctx_from_count_mag(int row, int col, int count,
+ int sig_mag) {
+ const int ctx = base_level_count_to_index[count];
+ int ctx_idx = -1;
+
+ if (row == 0 && col == 0) {
+ if (sig_mag >= 2) return ctx_idx = 0;
+ if (sig_mag == 1) {
+ if (count >= 2)
+ ctx_idx = 1;
+ else
+ ctx_idx = 2;
+
+ return ctx_idx;
+ }
+
+ ctx_idx = 3 + ctx;
+ assert(ctx_idx <= 6);
+ return ctx_idx;
+ } else if (row == 0) {
+ if (sig_mag >= 2) return ctx_idx = 6;
+ if (sig_mag == 1) {
+ if (count >= 2)
+ ctx_idx = 7;
+ else
+ ctx_idx = 8;
+ return ctx_idx;
+ }
+
+ ctx_idx = 9 + ctx;
+ assert(ctx_idx <= 11);
+ return ctx_idx;
+ } else if (col == 0) {
+ if (sig_mag >= 2) return ctx_idx = 12;
+ if (sig_mag == 1) {
+ if (count >= 2)
+ ctx_idx = 13;
+ else
+ ctx_idx = 14;
+
+ return ctx_idx;
+ }
+
+ ctx_idx = 15 + ctx;
+ assert(ctx_idx <= 17);
+ // TODO(angiebird): turn this on once the optimization is finalized
+ // assert(ctx_idx < 28);
+ } else {
+ if (sig_mag >= 2) return ctx_idx = 18;
+ if (sig_mag == 1) {
+ if (count >= 2)
+ ctx_idx = 19;
+ else
+ ctx_idx = 20;
+ return ctx_idx;
+ }
+
+ ctx_idx = 21 + ctx;
+
+ assert(ctx_idx <= 24);
+ }
+ return ctx_idx;
+}
+
+static INLINE int get_br_ctx_2d(const uint8_t *const levels,
+ const int c, // raster order
+ const int bwl) {
+ assert(c > 0);
+ const int row = c >> bwl;
+ const int col = c - (row << bwl);
+ const int stride = (1 << bwl) + TX_PAD_HOR;
+ const int pos = row * stride + col;
+ int mag = AOMMIN(levels[pos + 1], MAX_BASE_BR_RANGE) +
+ AOMMIN(levels[pos + stride], MAX_BASE_BR_RANGE) +
+ AOMMIN(levels[pos + 1 + stride], MAX_BASE_BR_RANGE);
+ mag = AOMMIN((mag + 1) >> 1, 6);
+ //((row | col) < 2) is equivalent to ((row < 2) && (col < 2))
+ if ((row | col) < 2) return mag + 7;
+ return mag + 14;
+}
+
+static AOM_FORCE_INLINE int get_br_ctx(const uint8_t *const levels,
+ const int c, // raster order
+ const int bwl, const TX_CLASS tx_class) {
+ const int row = c >> bwl;
+ const int col = c - (row << bwl);
+ const int stride = (1 << bwl) + TX_PAD_HOR;
+ const int pos = row * stride + col;
+ int mag = levels[pos + 1];
+ mag += levels[pos + stride];
+ switch (tx_class) {
+ case TX_CLASS_2D:
+ mag += levels[pos + stride + 1];
+ mag = AOMMIN((mag + 1) >> 1, 6);
+ if (c == 0) return mag;
+ if ((row < 2) && (col < 2)) return mag + 7;
+ break;
+ case TX_CLASS_HORIZ:
+ mag += levels[pos + 2];
+ mag = AOMMIN((mag + 1) >> 1, 6);
+ if (c == 0) return mag;
+ if (col == 0) return mag + 7;
+ break;
+ case TX_CLASS_VERT:
+ mag += levels[pos + (stride << 1)];
+ mag = AOMMIN((mag + 1) >> 1, 6);
+ if (c == 0) return mag;
+ if (row == 0) return mag + 7;
+ break;
+ default: break;
+ }
+
+ return mag + 14;
+}
+
+static const uint8_t clip_max3[256] = {
+ 0, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3
+};
+
+static AOM_FORCE_INLINE int get_nz_mag(const uint8_t *const levels,
+ const int bwl, const TX_CLASS tx_class) {
+ int mag;
+
+ // Note: AOMMIN(level, 3) is useless for decoder since level < 3.
+ mag = clip_max3[levels[1]]; // { 0, 1 }
+ mag += clip_max3[levels[(1 << bwl) + TX_PAD_HOR]]; // { 1, 0 }
+
+ if (tx_class == TX_CLASS_2D) {
+ mag += clip_max3[levels[(1 << bwl) + TX_PAD_HOR + 1]]; // { 1, 1 }
+ mag += clip_max3[levels[2]]; // { 0, 2 }
+ mag += clip_max3[levels[(2 << bwl) + (2 << TX_PAD_HOR_LOG2)]]; // { 2, 0 }
+ } else if (tx_class == TX_CLASS_VERT) {
+ mag += clip_max3[levels[(2 << bwl) + (2 << TX_PAD_HOR_LOG2)]]; // { 2, 0 }
+ mag += clip_max3[levels[(3 << bwl) + (3 << TX_PAD_HOR_LOG2)]]; // { 3, 0 }
+ mag += clip_max3[levels[(4 << bwl) + (4 << TX_PAD_HOR_LOG2)]]; // { 4, 0 }
+ } else {
+ mag += clip_max3[levels[2]]; // { 0, 2 }
+ mag += clip_max3[levels[3]]; // { 0, 3 }
+ mag += clip_max3[levels[4]]; // { 0, 4 }
+ }
+
+ return mag;
+}
+
+#define NZ_MAP_CTX_0 SIG_COEF_CONTEXTS_2D
+#define NZ_MAP_CTX_5 (NZ_MAP_CTX_0 + 5)
+#define NZ_MAP_CTX_10 (NZ_MAP_CTX_0 + 10)
+
+static const int nz_map_ctx_offset_1d[32] = {
+ NZ_MAP_CTX_0, NZ_MAP_CTX_5, NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10,
+ NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10,
+ NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10,
+ NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10,
+ NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10,
+ NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10, NZ_MAP_CTX_10,
+ NZ_MAP_CTX_10, NZ_MAP_CTX_10,
+};
+
+static AOM_FORCE_INLINE int get_nz_map_ctx_from_stats(
+ const int stats,
+ const int coeff_idx, // raster order
+ const int bwl, const TX_SIZE tx_size, const TX_CLASS tx_class) {
+ // tx_class == 0(TX_CLASS_2D)
+ if ((tx_class | coeff_idx) == 0) return 0;
+ int ctx = (stats + 1) >> 1;
+ ctx = AOMMIN(ctx, 4);
+ switch (tx_class) {
+ case TX_CLASS_2D: {
+ // This is the algorithm to generate av1_nz_map_ctx_offset[][]
+ // const int width = tx_size_wide[tx_size];
+ // const int height = tx_size_high[tx_size];
+ // if (width < height) {
+ // if (row < 2) return 11 + ctx;
+ // } else if (width > height) {
+ // if (col < 2) return 16 + ctx;
+ // }
+ // if (row + col < 2) return ctx + 1;
+ // if (row + col < 4) return 5 + ctx + 1;
+ // return 21 + ctx;
+ return ctx + av1_nz_map_ctx_offset[tx_size][coeff_idx];
+ }
+ case TX_CLASS_HORIZ: {
+ const int row = coeff_idx >> bwl;
+ const int col = coeff_idx - (row << bwl);
+ return ctx + nz_map_ctx_offset_1d[col];
+ break;
+ }
+ case TX_CLASS_VERT: {
+ const int row = coeff_idx >> bwl;
+ return ctx + nz_map_ctx_offset_1d[row];
+ break;
+ }
+ default: break;
+ }
+ return 0;
+}
+
+typedef aom_cdf_prob (*base_cdf_arr)[CDF_SIZE(4)];
+typedef aom_cdf_prob (*br_cdf_arr)[CDF_SIZE(BR_CDF_SIZE)];
+
+static INLINE int get_lower_levels_ctx_eob(int bwl, int height, int scan_idx) {
+ if (scan_idx == 0) return 0;
+ if (scan_idx <= (height << bwl) / 8) return 1;
+ if (scan_idx <= (height << bwl) / 4) return 2;
+ return 3;
+}
+
+static INLINE int get_lower_levels_ctx_2d(const uint8_t *levels, int coeff_idx,
+ int bwl, TX_SIZE tx_size) {
+ assert(coeff_idx > 0);
+ int mag;
+ // Note: AOMMIN(level, 3) is useless for decoder since level < 3.
+ levels = levels + get_padded_idx(coeff_idx, bwl);
+ mag = AOMMIN(levels[1], 3); // { 0, 1 }
+ mag += AOMMIN(levels[(1 << bwl) + TX_PAD_HOR], 3); // { 1, 0 }
+ mag += AOMMIN(levels[(1 << bwl) + TX_PAD_HOR + 1], 3); // { 1, 1 }
+ mag += AOMMIN(levels[2], 3); // { 0, 2 }
+ mag += AOMMIN(levels[(2 << bwl) + (2 << TX_PAD_HOR_LOG2)], 3); // { 2, 0 }
+
+ const int ctx = AOMMIN((mag + 1) >> 1, 4);
+ return ctx + av1_nz_map_ctx_offset[tx_size][coeff_idx];
+}
+static AOM_FORCE_INLINE int get_lower_levels_ctx(const uint8_t *levels,
+ int coeff_idx, int bwl,
+ TX_SIZE tx_size,
+ TX_CLASS tx_class) {
+ const int stats =
+ get_nz_mag(levels + get_padded_idx(coeff_idx, bwl), bwl, tx_class);
+ return get_nz_map_ctx_from_stats(stats, coeff_idx, bwl, tx_size, tx_class);
+}
+
+static INLINE int get_lower_levels_ctx_general(int is_last, int scan_idx,
+ int bwl, int height,
+ const uint8_t *levels,
+ int coeff_idx, TX_SIZE tx_size,
+ TX_CLASS tx_class) {
+ if (is_last) {
+ if (scan_idx == 0) return 0;
+ if (scan_idx <= (height << bwl) >> 3) return 1;
+ if (scan_idx <= (height << bwl) >> 2) return 2;
+ return 3;
+ }
+ return get_lower_levels_ctx(levels, coeff_idx, bwl, tx_size, tx_class);
+}
+
+static INLINE void set_dc_sign(int *cul_level, int dc_val) {
+ if (dc_val < 0)
+ *cul_level |= 1 << COEFF_CONTEXT_BITS;
+ else if (dc_val > 0)
+ *cul_level += 2 << COEFF_CONTEXT_BITS;
+}
+
+static INLINE void get_txb_ctx(const BLOCK_SIZE plane_bsize,
+ const TX_SIZE tx_size, const int plane,
+ const ENTROPY_CONTEXT *const a,
+ const ENTROPY_CONTEXT *const l,
+ TXB_CTX *const txb_ctx) {
+#define MAX_TX_SIZE_UNIT 16
+ static const int8_t signs[3] = { 0, -1, 1 };
+ static const int8_t dc_sign_contexts[4 * MAX_TX_SIZE_UNIT + 1] = {
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
+ };
+ const int txb_w_unit = tx_size_wide_unit[tx_size];
+ const int txb_h_unit = tx_size_high_unit[tx_size];
+ int dc_sign = 0;
+ int k = 0;
+
+ do {
+ const unsigned int sign = ((uint8_t)a[k]) >> COEFF_CONTEXT_BITS;
+ assert(sign <= 2);
+ dc_sign += signs[sign];
+ } while (++k < txb_w_unit);
+
+ k = 0;
+ do {
+ const unsigned int sign = ((uint8_t)l[k]) >> COEFF_CONTEXT_BITS;
+ assert(sign <= 2);
+ dc_sign += signs[sign];
+ } while (++k < txb_h_unit);
+
+ txb_ctx->dc_sign_ctx = dc_sign_contexts[dc_sign + 2 * MAX_TX_SIZE_UNIT];
+
+ if (plane == 0) {
+ if (plane_bsize == txsize_to_bsize[tx_size]) {
+ txb_ctx->txb_skip_ctx = 0;
+ } else {
+ // This is the algorithm to generate table skip_contexts[min][max].
+ // if (!max)
+ // txb_skip_ctx = 1;
+ // else if (!min)
+ // txb_skip_ctx = 2 + (max > 3);
+ // else if (max <= 3)
+ // txb_skip_ctx = 4;
+ // else if (min <= 3)
+ // txb_skip_ctx = 5;
+ // else
+ // txb_skip_ctx = 6;
+ static const uint8_t skip_contexts[5][5] = { { 1, 2, 2, 2, 3 },
+ { 1, 4, 4, 4, 5 },
+ { 1, 4, 4, 4, 5 },
+ { 1, 4, 4, 4, 5 },
+ { 1, 4, 4, 4, 6 } };
+ int top = 0;
+ int left = 0;
+
+ k = 0;
+ do {
+ top |= a[k];
+ } while (++k < txb_w_unit);
+ top &= COEFF_CONTEXT_MASK;
+
+ k = 0;
+ do {
+ left |= l[k];
+ } while (++k < txb_h_unit);
+ left &= COEFF_CONTEXT_MASK;
+ const int max = AOMMIN(top | left, 4);
+ const int min = AOMMIN(AOMMIN(top, left), 4);
+
+ txb_ctx->txb_skip_ctx = skip_contexts[min][max];
+ }
+ } else {
+ const int ctx_base = get_entropy_context(tx_size, a, l);
+ const int ctx_offset = (num_pels_log2_lookup[plane_bsize] >
+ num_pels_log2_lookup[txsize_to_bsize[tx_size]])
+ ? 10
+ : 7;
+ txb_ctx->txb_skip_ctx = ctx_base + ctx_offset;
+ }
+#undef MAX_TX_SIZE_UNIT
+}
+
+void av1_init_lv_map(AV1_COMMON *cm);
+
+#endif // AOM_AV1_COMMON_TXB_COMMON_H_
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