X-Git-Url: http://sigrok.org/gitweb/?p=libsigrok.git;a=blobdiff_plain;f=filter.c;h=8e74b10d0f0f4ae8742b1ea3bba77243eaefc924;hp=fc6de634f1b276e4a1cd3a2c3d656e589f7e86fb;hb=HEAD;hpb=1907d2c928e328209f6d8832f73e369d28db5ab1 diff --git a/filter.c b/filter.c deleted file mode 100644 index fc6de634..00000000 --- a/filter.c +++ /dev/null @@ -1,144 +0,0 @@ -/* - * This file is part of the sigrok project. - * - * Copyright (C) 2010-2012 Bert Vermeulen - * - * 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 3 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, see . - */ - -#include -#include -#include -#include "libsigrok.h" -#include "libsigrok-internal.h" - -/** - * Remove unused probes from samples. - * - * Convert sample from maximum probes -- the way the hardware driver sent - * it -- to a sample taking up only as much space as required, with - * unused probes removed. - * - * The "unit size" is the number of bytes used to store probe values. - * For example, a unit size of 1 means one byte is used (which can store - * 8 probe values, each of them is 1 bit). A unit size of 2 means we can - * store 16 probe values, 3 means we can store 24 probe values, and so on. - * - * If the data coming from the logic analyzer has a unit size of 4 for - * example (as the device has 32 probes), but only 2 of them are actually - * used in an acquisition, this function can convert the samples to only - * use up 1 byte per sample (unit size = 1) instead of 4 bytes per sample. - * - * The output will contain the probe values in the order specified via the - * probelist. For example, if in_unitsize = 4, probelist = [5, 16, 30], and - * out_unitsize = 1, then the output samples (each of them one byte in size) - * will have the following format: bit 0 = value of probe 5, bit 1 = value - * of probe 16, bit 2 = value of probe 30. Unused bit(s) in the output byte(s) - * are zero. - * - * The caller must make sure that length_in is not bigger than the memory - * actually allocated for the input data (data_in), as this function does - * not check that. - * - * @param in_unitsize The unit size (>= 1) of the input (data_in). - * @param out_unitsize The unit size (>= 1) the output shall have (data_out). - * The requested unit size must be big enough to hold as - * much data as is specified by the number of enabled - * probes in 'probelist'. - * @param probelist Pointer to a list of probe numbers, numbered starting - * from 0. The list is terminated with -1. - * @param data_in Pointer to the input data buffer. Must not be NULL. - * @param length_in The input data length (>= 1), in number of bytes. - * @param data_out Variable which will point to the newly allocated buffer - * of output data. The caller is responsible for g_free()'ing - * the buffer when it's no longer needed. Must not be NULL. - * @param length_out Pointer to the variable which will contain the output - * data length (in number of bytes) when the function - * returns SR_OK. Must not be NULL. - * - * @return SR_OK upon success, SR_ERR_MALLOC upon memory allocation errors, - * or SR_ERR_ARG upon invalid arguments. - * If something other than SR_OK is returned, the values of - * out_unitsize, data_out, and length_out are undefined. - */ -SR_API int sr_filter_probes(int in_unitsize, int out_unitsize, - const int *probelist, const uint8_t *data_in, - uint64_t length_in, uint8_t **data_out, - uint64_t *length_out) -{ - unsigned int in_offset, out_offset; - int num_enabled_probes, out_bit, i; - uint64_t sample_in, sample_out; - - if (!probelist) { - sr_err("filter: %s: probelist was NULL", __func__); - return SR_ERR_ARG; - } - - if (!data_in) { - sr_err("filter: %s: data_in was NULL", __func__); - return SR_ERR_ARG; - } - - if (!data_out) { - sr_err("filter: %s: data_out was NULL", __func__); - return SR_ERR_ARG; - } - - if (!length_out) { - sr_err("filter: %s: length_out was NULL", __func__); - return SR_ERR_ARG; - } - - num_enabled_probes = 0; - for (i = 0; probelist[i] != -1; i++) - num_enabled_probes++; - - /* Are there more probes than the target unit size supports? */ - if (num_enabled_probes > out_unitsize * 8) { - sr_err("filter: %s: too many probes (%d) for the target unit " - "size (%d)", __func__, num_enabled_probes, out_unitsize); - return SR_ERR_ARG; - } - - if (!(*data_out = g_try_malloc(length_in))) { - sr_err("filter: %s: data_out malloc failed", __func__); - return SR_ERR_MALLOC; - } - - if (num_enabled_probes == in_unitsize * 8) { - /* All probes are used -- no need to compress anything. */ - memcpy(*data_out, data_in, length_in); - *length_out = length_in; - return SR_OK; - } - - /* If we reached this point, not all probes are used, so "compress". */ - in_offset = out_offset = 0; - while (in_offset <= length_in - in_unitsize) { - memcpy(&sample_in, data_in + in_offset, in_unitsize); - sample_out = out_bit = 0; - for (i = 0; probelist[i] != -1; i++) { - if (sample_in & (1 << (probelist[i]))) - sample_out |= (1 << out_bit); - out_bit++; - } - memcpy((*data_out) + out_offset, &sample_out, out_unitsize); - in_offset += in_unitsize; - out_offset += out_unitsize; - } - *length_out = out_offset; - - return SR_OK; -}