From e4fe71c04fbe69581ba10f7b19158a4559b5a5d8 Mon Sep 17 00:00:00 2001 From: Vadim Yanitskiy Date: Mon, 19 Jun 2017 17:59:48 +0700 Subject: core/conv: use proper filenames We already have generic convolutional transcoding implementation written by Sylvain Munaut and named 'conv.c', so 'viterbi_*' names looked a bit confusing. Let's use a single naming scheme for Viterbi related code. Change-Id: I61062a8d1fbf5f5fc85b4fac58dc4e9fa8b5ef90 --- src/viterbi_generic.c | 207 -------------------------------------------------- 1 file changed, 207 deletions(-) delete mode 100644 src/viterbi_generic.c (limited to 'src/viterbi_generic.c') diff --git a/src/viterbi_generic.c b/src/viterbi_generic.c deleted file mode 100644 index 60426685..00000000 --- a/src/viterbi_generic.c +++ /dev/null @@ -1,207 +0,0 @@ -/* - * Viterbi decoder - * - * Copyright (C) 2013, 2014 Thomas Tsou - * - * All Rights Reserved - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#include -#include -#include - -/* Add-Compare-Select (ACS-Butterfly) - * Compute 4 accumulated path metrics and 4 path selections. Note that path - * selections are store as -1 and 0 rather than 0 and 1. This is to match - * the output format of the SSE packed compare instruction 'pmaxuw'. - */ - -static void acs_butterfly(int state, int num_states, - int16_t metric, int16_t *sum, - int16_t *new_sum, int16_t *path) -{ - int state0, state1; - int sum0, sum1, sum2, sum3; - - state0 = *(sum + (2 * state + 0)); - state1 = *(sum + (2 * state + 1)); - - sum0 = state0 + metric; - sum1 = state1 - metric; - sum2 = state0 - metric; - sum3 = state1 + metric; - - if (sum0 >= sum1) { - *new_sum = sum0; - *path = -1; - } else { - *new_sum = sum1; - *path = 0; - } - - if (sum2 >= sum3) { - *(new_sum + num_states / 2) = sum2; - *(path + num_states / 2) = -1; - } else { - *(new_sum + num_states / 2) = sum3; - *(path + num_states / 2) = 0; - } -} - -/* Branch metrics unit N=2 */ -static void gen_branch_metrics_n2(int num_states, const int8_t *seq, - const int16_t *out, int16_t *metrics) -{ - int i; - - for (i = 0; i < num_states / 2; i++) { - metrics[i] = seq[0] * out[2 * i + 0] + - seq[1] * out[2 * i + 1]; - } -} - -/* Branch metrics unit N=3 */ -static void gen_branch_metrics_n3(int num_states, const int8_t *seq, - const int16_t *out, int16_t *metrics) -{ - int i; - - for (i = 0; i < num_states / 2; i++) { - metrics[i] = seq[0] * out[4 * i + 0] + - seq[1] * out[4 * i + 1] + - seq[2] * out[4 * i + 2]; - } -} - -/* Branch metrics unit N=4 */ -static void gen_branch_metrics_n4(int num_states, const int8_t *seq, - const int16_t *out, int16_t *metrics) -{ - int i; - - for (i = 0; i < num_states / 2; i++) { - metrics[i] = seq[0] * out[4 * i + 0] + - seq[1] * out[4 * i + 1] + - seq[2] * out[4 * i + 2] + - seq[3] * out[4 * i + 3]; - } -} - -/* Path metric unit */ -static void gen_path_metrics(int num_states, int16_t *sums, - int16_t *metrics, int16_t *paths, int norm) -{ - int i; - int16_t min; - int16_t new_sums[num_states]; - - for (i = 0; i < num_states / 2; i++) - acs_butterfly(i, num_states, metrics[i], - sums, &new_sums[i], &paths[i]); - - if (norm) { - min = new_sums[0]; - - for (i = 1; i < num_states; i++) - if (new_sums[i] < min) - min = new_sums[i]; - - for (i = 0; i < num_states; i++) - new_sums[i] -= min; - } - - memcpy(sums, new_sums, num_states * sizeof(int16_t)); -} - -/* Not-aligned Memory Allocator */ -__attribute__ ((visibility("hidden"))) -int16_t *osmo_conv_gen_vdec_malloc(size_t n) -{ - return (int16_t *) malloc(sizeof(int16_t) * n); -} - -__attribute__ ((visibility("hidden"))) -void osmo_conv_gen_vdec_free(int16_t *ptr) -{ - free(ptr); -} - -/* 16-state branch-path metrics units (K=5) */ -__attribute__ ((visibility("hidden"))) -void osmo_conv_gen_metrics_k5_n2(const int8_t *seq, const int16_t *out, - int16_t *sums, int16_t *paths, int norm) -{ - int16_t metrics[8]; - - gen_branch_metrics_n2(16, seq, out, metrics); - gen_path_metrics(16, sums, metrics, paths, norm); -} - -__attribute__ ((visibility("hidden"))) -void osmo_conv_gen_metrics_k5_n3(const int8_t *seq, const int16_t *out, - int16_t *sums, int16_t *paths, int norm) -{ - int16_t metrics[8]; - - gen_branch_metrics_n3(16, seq, out, metrics); - gen_path_metrics(16, sums, metrics, paths, norm); - -} - -__attribute__ ((visibility("hidden"))) -void osmo_conv_gen_metrics_k5_n4(const int8_t *seq, const int16_t *out, - int16_t *sums, int16_t *paths, int norm) -{ - int16_t metrics[8]; - - gen_branch_metrics_n4(16, seq, out, metrics); - gen_path_metrics(16, sums, metrics, paths, norm); - -} - -/* 64-state branch-path metrics units (K=7) */ -__attribute__ ((visibility("hidden"))) -void osmo_conv_gen_metrics_k7_n2(const int8_t *seq, const int16_t *out, - int16_t *sums, int16_t *paths, int norm) -{ - int16_t metrics[32]; - - gen_branch_metrics_n2(64, seq, out, metrics); - gen_path_metrics(64, sums, metrics, paths, norm); - -} - -__attribute__ ((visibility("hidden"))) -void osmo_conv_gen_metrics_k7_n3(const int8_t *seq, const int16_t *out, - int16_t *sums, int16_t *paths, int norm) -{ - int16_t metrics[32]; - - gen_branch_metrics_n3(64, seq, out, metrics); - gen_path_metrics(64, sums, metrics, paths, norm); - -} - -__attribute__ ((visibility("hidden"))) -void osmo_conv_gen_metrics_k7_n4(const int8_t *seq, const int16_t *out, - int16_t *sums, int16_t *paths, int norm) -{ - int16_t metrics[32]; - - gen_branch_metrics_n4(64, seq, out, metrics); - gen_path_metrics(64, sums, metrics, paths, norm); -} -- cgit v1.2.3