/* Copyright (c) 2022 Amazon Written by Jan Buethe */ /* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "os_support.h" #include "dred_decoder.h" #include "dred_coding.h" #include "celt/entdec.h" #include "celt/laplace.h" #include "dred_rdovae_stats_data.h" #include "dred_rdovae_constants.h" static void dred_decode_latents(ec_dec *dec, float *x, const opus_uint8 *scale, const opus_uint8 *r, const opus_uint8 *p0, int dim) { int i; for (i=0;idred_offset = 16 - ec_dec_uint(&ec, 32) - extra_offset + dred_frame_offset; /*printf("%d %d %d\n", dred_offset, q0, dQ);*/ qmax = 15; if (q0 < 14 && dQ > 0) { int nvals; int ft; int s; /* The distribution for the dQmax symbol is split evenly between zero (which implies qmax == 15) and larger values, with the probability of all larger values being uniform. This is equivalent to coding 1 bit to decide if the maximum is less than 15 followed by a uint to decide the actual value if it is less than 15, but combined into a single symbol. */ nvals = 15 - (q0 + 1); ft = 2*nvals; s = ec_decode(&ec, ft); if (s >= nvals) { qmax = q0 + (s - nvals) + 1; ec_dec_update(&ec, s, s + 1, ft); } else { ec_dec_update(&ec, 0, nvals, ft); } } state_qoffset = q0*DRED_STATE_DIM; dred_decode_latents( &ec, dec->state, dred_state_quant_scales_q8 + state_qoffset, dred_state_r_q8 + state_qoffset, dred_state_p0_q8 + state_qoffset, DRED_STATE_DIM); /* decode newest to oldest and store oldest to newest */ for (i = 0; i < IMIN(DRED_NUM_REDUNDANCY_FRAMES, (min_feature_frames+1)/2); i += 2) { /* FIXME: Figure out how to avoid missing a last frame that would take up < 8 bits. */ if (8*num_bytes - ec_tell(&ec) <= 7) break; q_level = compute_quantizer(q0, dQ, qmax, i/2); offset = q_level*DRED_LATENT_DIM; dred_decode_latents( &ec, &dec->latents[(i/2)*DRED_LATENT_DIM], dred_latent_quant_scales_q8 + offset, dred_latent_r_q8 + offset, dred_latent_p0_q8 + offset, DRED_LATENT_DIM ); offset = 2 * i * DRED_NUM_FEATURES; } dec->process_stage = 1; dec->nb_latents = i/2; return i/2; }