diff options
Diffstat (limited to 'third_party/aom/av1/decoder/pvq_decoder.c')
| -rw-r--r-- | third_party/aom/av1/decoder/pvq_decoder.c | 378 |
1 files changed, 0 insertions, 378 deletions
diff --git a/third_party/aom/av1/decoder/pvq_decoder.c b/third_party/aom/av1/decoder/pvq_decoder.c deleted file mode 100644 index d9a8e8056..000000000 --- a/third_party/aom/av1/decoder/pvq_decoder.c +++ /dev/null @@ -1,378 +0,0 @@ -/* - * 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 <stdio.h> -#include <stdlib.h> -#include "./aom_config.h" -#include "aom_dsp/bitreader.h" -#include "aom_dsp/entcode.h" -#include "aom_dsp/entdec.h" -#include "av1/common/odintrin.h" -#include "av1/common/partition.h" -#include "av1/common/pvq_state.h" -#include "av1/decoder/decint.h" -#include "av1/decoder/pvq_decoder.h" -#include "aom_ports/system_state.h" - -int aom_read_symbol_pvq_(aom_reader *r, aom_cdf_prob *cdf, int nsymbs - ACCT_STR_PARAM) { - if (cdf[0] == 0) - aom_cdf_init_q15_1D(cdf, nsymbs, CDF_SIZE(nsymbs)); - return aom_read_symbol(r, cdf, nsymbs, ACCT_STR_NAME); -} - -static void aom_decode_pvq_codeword(aom_reader *r, od_pvq_codeword_ctx *ctx, - od_coeff *y, int n, int k) { - int i; - aom_decode_band_pvq_splits(r, ctx, y, n, k, 0); - for (i = 0; i < n; i++) { - if (y[i] && aom_read_bit(r, "pvq:sign")) y[i] = -y[i]; - } -} - -/** Inverse of neg_interleave; decodes the interleaved gain. - * - * @param [in] x quantized/interleaved gain to decode - * @param [in] ref quantized gain of the reference - * @return original quantized gain value - */ -static int neg_deinterleave(int x, int ref) { - if (x < 2*ref-1) { - if (x & 1) return ref - 1 - (x >> 1); - else return ref + (x >> 1); - } - else return x+1; -} - -/** Synthesizes one parition of coefficient values from a PVQ-encoded - * vector. - * - * @param [out] xcoeff output coefficient partition (x in math doc) - * @param [in] ypulse PVQ-encoded values (y in math doc); in the noref - * case, this vector has n entries, in the - * reference case it contains n-1 entries - * (the m-th entry is not included) - * @param [in] ref reference vector (prediction) - * @param [in] n number of elements in this partition - * @param [in] gr gain of the reference vector (prediction) - * @param [in] noref indicates presence or lack of prediction - * @param [in] g decoded quantized vector gain - * @param [in] theta decoded theta (prediction error) - * @param [in] qm QM with magnitude compensation - * @param [in] qm_inv Inverse of QM with magnitude compensation - */ -static void pvq_synthesis(od_coeff *xcoeff, od_coeff *ypulse, od_val16 *r16, - int n, od_val32 gr, int noref, od_val32 g, od_val32 theta, const int16_t *qm_inv, - int shift) { - int s; - int m; - /* Sign of the Householder reflection vector */ - s = 0; - /* Direction of the Householder reflection vector */ - m = noref ? 0 : od_compute_householder(r16, n, gr, &s, shift); - od_pvq_synthesis_partial(xcoeff, ypulse, r16, n, noref, g, theta, m, s, - qm_inv); -} - -typedef struct { - od_coeff *ref; - int nb_coeffs; - int allow_flip; -} cfl_ctx; - -/** Decodes a single vector of integers (eg, a partition within a - * coefficient block) encoded using PVQ - * - * @param [in,out] ec range encoder - * @param [in] q0 scale/quantizer - * @param [in] n number of coefficients in partition - * @param [in,out] model entropy decoder state - * @param [in,out] adapt adaptation context - * @param [in,out] exg ExQ16 expectation of decoded gain value - * @param [in,out] ext ExQ16 expectation of decoded theta value - * @param [in] ref 'reference' (prediction) vector - * @param [out] out decoded partition - * @param [out] noref boolean indicating absence of reference - * @param [in] beta per-band activity masking beta param - * @param [in] is_keyframe whether we're encoding a keyframe - * @param [in] pli plane index - * @param [in] cdf_ctx selects which cdf context to use - * @param [in,out] skip_rest whether to skip further bands in each direction - * @param [in] band index of the band being decoded - * @param [in] band index of the band being decoded - * @param [out] skip skip flag with range [0,1] - * @param [in] qm QM with magnitude compensation - * @param [in] qm_inv Inverse of QM with magnitude compensation - */ -static void pvq_decode_partition(aom_reader *r, - int q0, - int n, - generic_encoder model[3], - od_adapt_ctx *adapt, - int *exg, - int *ext, - od_coeff *ref, - od_coeff *out, - int *noref, - od_val16 beta, - int is_keyframe, - int pli, - int cdf_ctx, - cfl_ctx *cfl, - int has_skip, - int *skip_rest, - int band, - int *skip, - const int16_t *qm, - const int16_t *qm_inv) { - int k; - od_val32 qcg; - int itheta; - od_val32 theta; - od_val32 gr; - od_val32 gain_offset; - od_coeff y[MAXN]; - int qg; - int id; - int i; - od_val16 ref16[MAXN]; - int rshift; - theta = 0; - gr = 0; - gain_offset = 0; - /* Skip is per-direction. For band=0, we can use any of the flags. */ - if (skip_rest[(band + 2) % 3]) { - qg = 0; - if (is_keyframe) { - itheta = -1; - *noref = 1; - } - else { - itheta = 0; - *noref = 0; - } - } - else { - /* Jointly decode gain, itheta and noref for small values. Then we handle - larger gain. */ - id = aom_read_symbol_pvq(r, &adapt->pvq.pvq_gaintheta_cdf[cdf_ctx][0], - 8 + 7*has_skip, "pvq:gaintheta"); - if (!is_keyframe && id >= 10) id++; - if (is_keyframe && id >= 8) id++; - if (id >= 8) { - id -= 8; - skip_rest[0] = skip_rest[1] = skip_rest[2] = 1; - } - qg = id & 1; - itheta = (id >> 1) - 1; - *noref = (itheta == -1); - } - /* The CfL flip bit is only decoded on the first band that has noref=0. */ - if (cfl->allow_flip && !*noref) { - int flip; - flip = aom_read_bit(r, "cfl:flip"); - if (flip) { - for (i = 0; i < cfl->nb_coeffs; i++) cfl->ref[i] = -cfl->ref[i]; - } - cfl->allow_flip = 0; - } - if (qg > 0) { - int tmp; - tmp = *exg; - qg = 1 + generic_decode(r, &model[!*noref], &tmp, 2, "pvq:gain"); - OD_IIR_DIADIC(*exg, qg << 16, 2); - } - *skip = 0; -#if defined(OD_FLOAT_PVQ) - rshift = 0; -#else - /* Shift needed to make the reference fit in 15 bits, so that the Householder - vector can fit in 16 bits. */ - rshift = OD_MAXI(0, od_vector_log_mag(ref, n) - 14); -#endif - for (i = 0; i < n; i++) { -#if defined(OD_FLOAT_PVQ) - ref16[i] = ref[i]*(double)qm[i]*OD_QM_SCALE_1; -#else - ref16[i] = OD_SHR_ROUND(ref[i]*qm[i], OD_QM_SHIFT + rshift); -#endif - } - if(!*noref){ - /* we have a reference; compute its gain */ - od_val32 cgr; - int icgr; - int cfl_enabled; - cfl_enabled = pli != 0 && is_keyframe && !OD_DISABLE_CFL; - cgr = od_pvq_compute_gain(ref16, n, q0, &gr, beta, rshift); - if (cfl_enabled) cgr = OD_CGAIN_SCALE; -#if defined(OD_FLOAT_PVQ) - icgr = (int)floor(.5 + cgr); -#else - icgr = OD_SHR_ROUND(cgr, OD_CGAIN_SHIFT); -#endif - /* quantized gain is interleave encoded when there's a reference; - deinterleave it now */ - if (is_keyframe) qg = neg_deinterleave(qg, icgr); - else { - qg = neg_deinterleave(qg, icgr + 1) - 1; - if (qg == 0) *skip = (icgr ? OD_PVQ_SKIP_ZERO : OD_PVQ_SKIP_COPY); - } - if (qg == icgr && itheta == 0 && !cfl_enabled) *skip = OD_PVQ_SKIP_COPY; - gain_offset = cgr - OD_SHL(icgr, OD_CGAIN_SHIFT); - qcg = OD_SHL(qg, OD_CGAIN_SHIFT) + gain_offset; - /* read and decode first-stage PVQ error theta */ - if (itheta > 1) { - int tmp; - tmp = *ext; - itheta = 2 + generic_decode(r, &model[2], &tmp, 2, "pvq:theta"); - OD_IIR_DIADIC(*ext, itheta << 16, 2); - } - theta = od_pvq_compute_theta(itheta, od_pvq_compute_max_theta(qcg, beta)); - } - else{ - itheta = 0; - if (!is_keyframe) qg++; - qcg = OD_SHL(qg, OD_CGAIN_SHIFT); - if (qg == 0) *skip = OD_PVQ_SKIP_ZERO; - } - - k = od_pvq_compute_k(qcg, itheta, *noref, n, beta); - if (k != 0) { - /* when noref==0, y is actually size n-1 */ - aom_decode_pvq_codeword(r, &adapt->pvq.pvq_codeword_ctx, y, - n - !*noref, k); - } - else { - OD_CLEAR(y, n); - } - if (*skip) { - if (*skip == OD_PVQ_SKIP_COPY) OD_COPY(out, ref, n); - else OD_CLEAR(out, n); - } - else { - od_val32 g; - g = od_gain_expand(qcg, q0, beta); - pvq_synthesis(out, y, ref16, n, gr, *noref, g, theta, qm_inv, rshift); - } - /* If OD_PVQ_SKIP_ZERO or OD_PVQ_SKIP_COPY, set skip to 1 for visualization */ - if (*skip) *skip = 1; -} - -/** Decodes a coefficient block (except for DC) encoded using PVQ - * - * @param [in,out] dec daala decoder context - * @param [in] ref 'reference' (prediction) vector - * @param [out] out decoded partition - * @param [in] q0 quantizer - * @param [in] pli plane index - * @param [in] bs log of the block size minus two - * @param [in] beta per-band activity masking beta param - * @param [in] is_keyframe whether we're encoding a keyframe - * @param [out] flags bitmask of the per band skip and noref flags - * @param [in] ac_dc_coded skip flag for the block (range 0-3) - * @param [in] qm QM with magnitude compensation - * @param [in] qm_inv Inverse of QM with magnitude compensation - */ -void od_pvq_decode(daala_dec_ctx *dec, - od_coeff *ref, - od_coeff *out, - int q0, - int pli, - int bs, - const od_val16 *beta, - int is_keyframe, - unsigned int *flags, - PVQ_SKIP_TYPE ac_dc_coded, - const int16_t *qm, - const int16_t *qm_inv){ - - int noref[PVQ_MAX_PARTITIONS]; - int skip[PVQ_MAX_PARTITIONS]; - int *exg; - int *ext; - int nb_bands; - int i; - const int *off; - int size[PVQ_MAX_PARTITIONS]; - generic_encoder *model; - int skip_rest[3] = {0}; - cfl_ctx cfl; - const unsigned char *pvq_qm; - int use_masking; - - aom_clear_system_state(); - - /*Default to skip=1 and noref=0 for all bands.*/ - for (i = 0; i < PVQ_MAX_PARTITIONS; i++) { - noref[i] = 0; - skip[i] = 1; - } - - use_masking = dec->use_activity_masking; - - if (use_masking) - pvq_qm = &dec->state.pvq_qm_q4[pli][0]; - else - pvq_qm = 0; - - exg = &dec->state.adapt->pvq.pvq_exg[pli][bs][0]; - ext = dec->state.adapt->pvq.pvq_ext + bs*PVQ_MAX_PARTITIONS; - model = dec->state.adapt->pvq.pvq_param_model; - nb_bands = OD_BAND_OFFSETS[bs][0]; - off = &OD_BAND_OFFSETS[bs][1]; - out[0] = ac_dc_coded & DC_CODED; - if (ac_dc_coded < AC_CODED) { - if (is_keyframe) for (i = 1; i < 1 << (2*bs + 4); i++) out[i] = 0; - else for (i = 1; i < 1 << (2*bs + 4); i++) out[i] = ref[i]; - } - else { - for (i = 0; i < nb_bands; i++) size[i] = off[i+1] - off[i]; - cfl.ref = ref; - cfl.nb_coeffs = off[nb_bands]; - cfl.allow_flip = pli != 0 && is_keyframe; - for (i = 0; i < nb_bands; i++) { - int q; - - if (use_masking) - q = OD_MAXI(1, q0 * pvq_qm[od_qm_get_index(bs, i + 1)] >> 4); - else - q = OD_MAXI(1, q0); - - pvq_decode_partition(dec->r, q, size[i], - model, dec->state.adapt, exg + i, ext + i, ref + off[i], out + off[i], - &noref[i], beta[i], is_keyframe, pli, - (pli != 0)*OD_TXSIZES*PVQ_MAX_PARTITIONS + bs*PVQ_MAX_PARTITIONS + i, - &cfl, i == 0 && (i < nb_bands - 1), skip_rest, i, &skip[i], - qm + off[i], qm_inv + off[i]); - if (i == 0 && !skip_rest[0] && bs > 0) { - int skip_dir; - int j; - skip_dir = aom_read_symbol(dec->r, - &dec->state.adapt->pvq.pvq_skip_dir_cdf[(pli != 0) + 2*(bs - 1)][0], 7, - "pvq:skiprest"); - for (j = 0; j < 3; j++) skip_rest[j] = !!(skip_dir & (1 << j)); - } - } - } - *flags = 0; - for (i = nb_bands - 1; i >= 0; i--) { - *flags <<= 1; - *flags |= noref[i]&1; - *flags <<= 1; - *flags |= skip[i]&1; - } -} |