/* * This file is part of the libsigrokdecode project. * * Copyright (C) 2010 Uwe Hermann * Copyright (C) 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 "libsigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */ #include "libsigrokdecode-internal.h" #include "config.h" #include #include #include #include /** * @mainpage libsigrokdecode API * * @section sec_intro Introduction * * The sigrok project aims at creating a * portable, cross-platform, Free/Libre/Open-Source signal analysis software * suite that supports various device types (such as logic analyzers, * oscilloscopes, multimeters, and more). * * libsigrokdecode is a * shared library written in C which provides the basic API for (streaming) * protocol decoding functionality. * * The protocol decoders * are written in Python (>= 3.0). * * @section sec_api API reference * * See the "Modules" page for an introduction to various libsigrokdecode * related topics and the detailed API documentation of the respective * functions. * * You can also browse the API documentation by file, or review all * data structures. * * @section sec_mailinglists Mailing lists * * There are two mailing lists for sigrok/libsigrokdecode: sigrok-devel and sigrok-commits. * * @section sec_irc IRC * * You can find the sigrok developers in the * \#sigrok * IRC channel on Freenode. * * @section sec_website Website * * sigrok.org/wiki/Libsigrokdecode */ /** * @file * * Initializing and shutting down libsigrokdecode. */ /** * @defgroup grp_init Initialization * * Initializing and shutting down libsigrokdecode. * * Before using any of the libsigrokdecode functionality, srd_init() must * be called to initialize the library. * * When libsigrokdecode functionality is no longer needed, srd_exit() should * be called. * * @{ */ /** @cond PRIVATE */ SRD_PRIV GSList *sessions = NULL; static int max_session_id = -1; static int session_is_valid(struct srd_session *sess); /* decoder.c */ extern SRD_PRIV GSList *pd_list; /* module_sigrokdecode.c */ extern PyMODINIT_FUNC PyInit_sigrokdecode(void); /* type_logic.c */ extern SRD_PRIV PyTypeObject srd_logic_type; /** @endcond */ /** * Initialize libsigrokdecode. * * This initializes the Python interpreter, and creates and initializes * a "sigrokdecode" Python module. * * Then, it searches for sigrok protocol decoders in the "decoders" * subdirectory of the the libsigrokdecode installation directory. * All decoders that are found are loaded into memory and added to an * internal list of decoders, which can be queried via srd_decoder_list(). * * The caller is responsible for calling the clean-up function srd_exit(), * which will properly shut down libsigrokdecode and free its allocated memory. * * Multiple calls to srd_init(), without calling srd_exit() in between, * are not allowed. * * @param path Path to an extra directory containing protocol decoders * which will be added to the Python sys.path. May be NULL. * * @return SRD_OK upon success, a (negative) error code otherwise. * Upon Python errors, SRD_ERR_PYTHON is returned. If the decoders * directory cannot be accessed, SRD_ERR_DECODERS_DIR is returned. * If not enough memory could be allocated, SRD_ERR_MALLOC is returned. * * @since 0.1.0 */ SRD_API int srd_init(const char *path) { int ret; char *env_path; if (max_session_id != -1) { srd_err("libsigrokdecode is already initialized."); return SRD_ERR; } srd_dbg("Initializing libsigrokdecode."); /* Add our own module to the list of built-in modules. */ PyImport_AppendInittab("sigrokdecode", PyInit_sigrokdecode); /* Initialize the Python interpreter. */ Py_Initialize(); /* Installed decoders. */ if ((ret = srd_decoder_searchpath_add(DECODERS_DIR)) != SRD_OK) { Py_Finalize(); return ret; } /* Path specified by the user. */ if (path) { if ((ret = srd_decoder_searchpath_add(path)) != SRD_OK) { Py_Finalize(); return ret; } } /* Environment variable overrides everything, for debugging. */ if ((env_path = getenv("SIGROKDECODE_DIR"))) { if ((ret = srd_decoder_searchpath_add(env_path)) != SRD_OK) { Py_Finalize(); return ret; } } max_session_id = 0; return SRD_OK; } /** * Shutdown libsigrokdecode. * * This frees all the memory allocated for protocol decoders and shuts down * the Python interpreter. * * This function should only be called if there was a (successful!) invocation * of srd_init() before. Calling this function multiple times in a row, without * any successful srd_init() calls in between, is not allowed. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @since 0.1.0 */ SRD_API int srd_exit(void) { GSList *l; srd_dbg("Exiting libsigrokdecode."); for (l = sessions; l; l = l->next) srd_session_destroy((struct srd_session *)l->data); srd_decoder_unload_all(); g_slist_free(pd_list); pd_list = NULL; /* Py_Finalize() returns void, any finalization errors are ignored. */ Py_Finalize(); max_session_id = -1; return SRD_OK; } /** * Add an additional search directory for the protocol decoders. * * The specified directory is prepended (not appended!) to Python's sys.path, * in order to search for sigrok protocol decoders in the specified * directories first, and in the generic Python module directories (and in * the current working directory) last. This avoids conflicts if there are * Python modules which have the same name as a sigrok protocol decoder in * sys.path or in the current working directory. * * @param path Path to the directory containing protocol decoders which shall * be added to the Python sys.path, or NULL. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @private * * @since 0.1.0 */ SRD_PRIV int srd_decoder_searchpath_add(const char *path) { PyObject *py_cur_path, *py_item; GString *new_path; int wc_len, i; wchar_t *wc_new_path; char *item; srd_dbg("Adding '%s' to module path.", path); new_path = g_string_sized_new(256); g_string_assign(new_path, path); py_cur_path = PySys_GetObject("path"); for (i = 0; i < PyList_Size(py_cur_path); i++) { g_string_append(new_path, G_SEARCHPATH_SEPARATOR_S); py_item = PyList_GetItem(py_cur_path, i); if (!PyUnicode_Check(py_item)) /* Shouldn't happen. */ continue; if (py_str_as_str(py_item, &item) != SRD_OK) continue; g_string_append(new_path, item); g_free(item); } /* Convert to wide chars. */ wc_len = sizeof(wchar_t) * (new_path->len + 1); if (!(wc_new_path = g_try_malloc(wc_len))) { srd_dbg("malloc failed"); return SRD_ERR_MALLOC; } mbstowcs(wc_new_path, new_path->str, wc_len); PySys_SetPath(wc_new_path); g_string_free(new_path, TRUE); g_free(wc_new_path); return SRD_OK; } /** @} */ /** * @defgroup grp_instances Decoder instances * * Decoder instance handling. * * @{ */ /** * Set one or more options in a decoder instance. * * Handled options are removed from the hash. * * @param di Decoder instance. * @param options A GHashTable of options to set. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @since 0.1.0 */ SRD_API int srd_inst_option_set(struct srd_decoder_inst *di, GHashTable *options) { PyObject *py_dec_options, *py_dec_optkeys, *py_di_options, *py_optval; PyObject *py_optlist, *py_classval; Py_UNICODE *py_ustr; GVariant *value; unsigned long long int val_ull; gint64 val_int; int num_optkeys, ret, size, i; const char *val_str; char *dbg, *key; if (!PyObject_HasAttrString(di->decoder->py_dec, "options")) { /* Decoder has no options. */ if (g_hash_table_size(options) == 0) { /* No options provided. */ return SRD_OK; } else { srd_err("Protocol decoder has no options."); return SRD_ERR_ARG; } return SRD_OK; } ret = SRD_ERR_PYTHON; key = NULL; py_dec_options = py_dec_optkeys = py_di_options = py_optval = NULL; py_optlist = py_classval = NULL; py_dec_options = PyObject_GetAttrString(di->decoder->py_dec, "options"); /* All of these are synthesized objects, so they're good. */ py_dec_optkeys = PyDict_Keys(py_dec_options); num_optkeys = PyList_Size(py_dec_optkeys); /* * The 'options' dictionary is a class variable, but we need to * change it. Changing it directly will affect the entire class, * so we need to create a new object for it, and populate that * instead. */ if (!(py_di_options = PyObject_GetAttrString(di->py_inst, "options"))) goto err_out; Py_DECREF(py_di_options); py_di_options = PyDict_New(); PyObject_SetAttrString(di->py_inst, "options", py_di_options); for (i = 0; i < num_optkeys; i++) { /* Get the default class value for this option. */ py_str_as_str(PyList_GetItem(py_dec_optkeys, i), &key); if (!(py_optlist = PyDict_GetItemString(py_dec_options, key))) goto err_out; if (!(py_classval = PyList_GetItem(py_optlist, 1))) goto err_out; if (!PyUnicode_Check(py_classval) && !PyLong_Check(py_classval)) { srd_err("Options of type %s are not yet supported.", Py_TYPE(py_classval)->tp_name); goto err_out; } if ((value = g_hash_table_lookup(options, key))) { dbg = g_variant_print(value, TRUE); srd_dbg("got option '%s' = %s", key, dbg); g_free(dbg); /* An override for this option was provided. */ if (PyUnicode_Check(py_classval)) { if (!g_variant_is_of_type(value, G_VARIANT_TYPE_STRING)) { srd_err("Option '%s' requires a string value.", key); goto err_out; } val_str = g_variant_get_string(value, NULL); if (!(py_optval = PyUnicode_FromString(val_str))) { /* Some UTF-8 encoding error. */ PyErr_Clear(); srd_err("Option '%s' requires a UTF-8 string value.", key); goto err_out; } } else if (PyLong_Check(py_classval)) { if (!g_variant_is_of_type(value, G_VARIANT_TYPE_INT64)) { srd_err("Option '%s' requires an integer value.", key); goto err_out; } val_int = g_variant_get_int64(value); if (!(py_optval = PyLong_FromLong(val_int))) { /* ValueError Exception */ PyErr_Clear(); srd_err("Option '%s' has invalid integer value.", key); goto err_out; } } g_hash_table_remove(options, key); } else { /* Use the class default for this option. */ if (PyUnicode_Check(py_classval)) { /* Make a brand new copy of the string. */ py_ustr = PyUnicode_AS_UNICODE(py_classval); size = PyUnicode_GET_SIZE(py_classval); py_optval = PyUnicode_FromUnicode(py_ustr, size); } else if (PyLong_Check(py_classval)) { /* Make a brand new copy of the integer. */ val_ull = PyLong_AsUnsignedLongLong(py_classval); if (val_ull == (unsigned long long)-1) { /* OverFlowError exception */ PyErr_Clear(); srd_err("Invalid integer value for %s: " "expected integer.", key); goto err_out; } if (!(py_optval = PyLong_FromUnsignedLongLong(val_ull))) goto err_out; } } /* * If we got here, py_optval holds a known good new reference * to the instance option to set. */ if (PyDict_SetItemString(py_di_options, key, py_optval) == -1) goto err_out; g_free(key); key = NULL; } ret = SRD_OK; err_out: Py_XDECREF(py_di_options); Py_XDECREF(py_dec_optkeys); Py_XDECREF(py_dec_options); g_free(key); if (PyErr_Occurred()) { srd_exception_catch("Stray exception in srd_inst_option_set()."); ret = SRD_ERR_PYTHON; } return ret; } /* Helper GComparefunc for g_slist_find_custom() in srd_inst_probe_set_all() */ static gint compare_probe_id(const struct srd_probe *a, const char *probe_id) { return strcmp(a->id, probe_id); } /** * Set all probes in a decoder instance. * * This function sets _all_ probes for the specified decoder instance, i.e., * it overwrites any probes that were already defined (if any). * * @param di Decoder instance. * @param new_probes A GHashTable of probes to set. Key is probe name, value is * the probe number. Samples passed to this instance will be * arranged in this order. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @since 0.1.0 */ SRD_API int srd_inst_probe_set_all(struct srd_decoder_inst *di, GHashTable *new_probes) { GVariant *probe_val; GList *l; GSList *sl; struct srd_probe *p; int *new_probemap, new_probenum; char *probe_id; int i, num_required_probes; srd_dbg("set probes called for instance %s with list of %d probes", di->inst_id, g_hash_table_size(new_probes)); if (g_hash_table_size(new_probes) == 0) /* No probes provided. */ return SRD_OK; if (di->dec_num_probes == 0) { /* Decoder has no probes. */ srd_err("Protocol decoder %s has no probes to define.", di->decoder->name); return SRD_ERR_ARG; } new_probemap = NULL; if (!(new_probemap = g_try_malloc(sizeof(int) * di->dec_num_probes))) { srd_err("Failed to g_malloc() new probe map."); return SRD_ERR_MALLOC; } /* * For now, map all indexes to probe -1 (can be overridden later). * This -1 is interpreted as an unspecified probe later. */ for (i = 0; i < di->dec_num_probes; i++) new_probemap[i] = -1; for (l = g_hash_table_get_keys(new_probes); l; l = l->next) { probe_id = l->data; probe_val= g_hash_table_lookup(new_probes, probe_id); if (!g_variant_is_of_type(probe_val, G_VARIANT_TYPE_INT32)) { /* Probe name was specified without a value. */ srd_err("No probe number was specified for %s.", probe_id); g_free(new_probemap); return SRD_ERR_ARG; } new_probenum = g_variant_get_int32(probe_val); if (!(sl = g_slist_find_custom(di->decoder->probes, probe_id, (GCompareFunc)compare_probe_id))) { /* Fall back on optional probes. */ if (!(sl = g_slist_find_custom(di->decoder->opt_probes, probe_id, (GCompareFunc) compare_probe_id))) { srd_err("Protocol decoder %s has no probe " "'%s'.", di->decoder->name, probe_id); g_free(new_probemap); return SRD_ERR_ARG; } } p = sl->data; new_probemap[p->order] = new_probenum; srd_dbg("Setting probe mapping: %s (index %d) = probe %d.", p->id, p->order, new_probenum); } srd_dbg("Final probe map:"); num_required_probes = g_slist_length(di->decoder->probes); for (i = 0; i < di->dec_num_probes; i++) { srd_dbg(" - index %d = probe %d (%s)", i, new_probemap[i], (i < num_required_probes) ? "required" : "optional"); } g_free(di->dec_probemap); di->dec_probemap = new_probemap; return SRD_OK; } /** * Create a new protocol decoder instance. * * @param sess The session holding the protocol decoder instance. * @param decoder_id Decoder 'id' field. * @param options GHashtable of options which override the defaults set in * the decoder class. May be NULL. * * @return Pointer to a newly allocated struct srd_decoder_inst, or * NULL in case of failure. * * @since 0.1.0 (the API changed in 0.3.0, though) */ SRD_API struct srd_decoder_inst *srd_inst_new(struct srd_session *sess, const char *decoder_id, GHashTable *options) { int i; struct srd_decoder *dec; struct srd_decoder_inst *di; char *inst_id; srd_dbg("Creating new %s instance.", decoder_id); if (session_is_valid(sess) != SRD_OK) { srd_err("Invalid session."); return NULL; } if (!(dec = srd_decoder_get_by_id(decoder_id))) { srd_err("Protocol decoder %s not found.", decoder_id); return NULL; } if (!(di = g_try_malloc0(sizeof(struct srd_decoder_inst)))) { srd_err("Failed to g_malloc() instance."); return NULL; } di->decoder = dec; di->sess = sess; if (options) { inst_id = g_hash_table_lookup(options, "id"); di->inst_id = g_strdup(inst_id ? inst_id : decoder_id); g_hash_table_remove(options, "id"); } else di->inst_id = g_strdup(decoder_id); /* * Prepare a default probe map, where samples come in the * order in which the decoder class defined them. */ di->dec_num_probes = g_slist_length(di->decoder->probes) + g_slist_length(di->decoder->opt_probes); if (di->dec_num_probes) { if (!(di->dec_probemap = g_try_malloc(sizeof(int) * di->dec_num_probes))) { srd_err("Failed to g_malloc() probe map."); g_free(di); return NULL; } for (i = 0; i < di->dec_num_probes; i++) di->dec_probemap[i] = i; } /* Create a new instance of this decoder class. */ if (!(di->py_inst = PyObject_CallObject(dec->py_dec, NULL))) { if (PyErr_Occurred()) srd_exception_catch("failed to create %s instance: ", decoder_id); g_free(di->dec_probemap); g_free(di); return NULL; } if (options && srd_inst_option_set(di, options) != SRD_OK) { g_free(di->dec_probemap); g_free(di); return NULL; } /* Instance takes input from a frontend by default. */ sess->di_list = g_slist_append(sess->di_list, di); return di; } /** * Stack a decoder instance on top of another. * * @param sess The session holding the protocol decoder instances. * @param di_from The instance to move. * @param di_to The instance on top of which di_from will be stacked. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @since 0.1.0 (the API changed in 0.3.0, though) */ SRD_API int srd_inst_stack(struct srd_session *sess, struct srd_decoder_inst *di_from, struct srd_decoder_inst *di_to) { if (session_is_valid(sess) != SRD_OK) { srd_err("Invalid session."); return SRD_ERR_ARG; } if (!di_from || !di_to) { srd_err("Invalid from/to instance pair."); return SRD_ERR_ARG; } if (g_slist_find(sess->di_list, di_to)) { /* Remove from the unstacked list. */ sess->di_list = g_slist_remove(sess->di_list, di_to); } /* Stack on top of source di. */ di_from->next_di = g_slist_append(di_from->next_di, di_to); return SRD_OK; } /** * Find a decoder instance by its instance ID. * * Only the bottom level of instances are searched -- instances already stacked * on top of another one will not be found. * * @param sess The session holding the protocol decoder instance. * @param inst_id The instance ID to be found. * * @return Pointer to struct srd_decoder_inst, or NULL if not found. * * @since 0.1.0 (the API changed in 0.3.0, though) */ SRD_API struct srd_decoder_inst *srd_inst_find_by_id(struct srd_session *sess, const char *inst_id) { GSList *l; struct srd_decoder_inst *tmp, *di; if (session_is_valid(sess) != SRD_OK) { srd_err("Invalid session."); return NULL; } di = NULL; for (l = sess->di_list; l; l = l->next) { tmp = l->data; if (!strcmp(tmp->inst_id, inst_id)) { di = tmp; break; } } return di; } static struct srd_decoder_inst *srd_sess_inst_find_by_obj( struct srd_session *sess, const GSList *stack, const PyObject *obj) { const GSList *l; struct srd_decoder_inst *tmp, *di; if (session_is_valid(sess) != SRD_OK) { srd_err("Invalid session."); return NULL; } di = NULL; for (l = stack ? stack : sess->di_list; di == NULL && l != NULL; l = l->next) { tmp = l->data; if (tmp->py_inst == obj) di = tmp; else if (tmp->next_di) di = srd_sess_inst_find_by_obj(sess, tmp->next_di, obj); } return di; } /** * Find a decoder instance by its Python object. * * I.e. find that instance's instantiation of the sigrokdecode.Decoder class. * This will recurse to find the instance anywhere in the stack tree of all * sessions. * * @param stack Pointer to a GSList of struct srd_decoder_inst, indicating the * stack to search. To start searching at the bottom level of * decoder instances, pass NULL. * @param obj The Python class instantiation. * * @return Pointer to struct srd_decoder_inst, or NULL if not found. * * @private * * @since 0.1.0 */ SRD_PRIV struct srd_decoder_inst *srd_inst_find_by_obj(const GSList *stack, const PyObject *obj) { struct srd_decoder_inst *di; struct srd_session *sess; GSList *l; di = NULL; for (l = sessions; di == NULL && l != NULL; l = l->next) { sess = l->data; di = srd_sess_inst_find_by_obj(sess, stack, obj); } return di; } /** @private */ SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di, PyObject *args) { PyObject *py_name, *py_res; GSList *l; struct srd_decoder_inst *next_di; srd_dbg("Calling start() method on protocol decoder instance %s.", di->inst_id); if (!(py_name = PyUnicode_FromString("start"))) { srd_err("Unable to build Python object for 'start'."); srd_exception_catch("Protocol decoder instance %s: ", di->inst_id); return SRD_ERR_PYTHON; } if (!(py_res = PyObject_CallMethodObjArgs(di->py_inst, py_name, args, NULL))) { srd_exception_catch("Protocol decoder instance %s: ", di->inst_id); return SRD_ERR_PYTHON; } Py_DecRef(py_res); Py_DecRef(py_name); /* * Start all the PDs stacked on top of this one. Pass along the * metadata all the way from the bottom PD, even though it's only * applicable to logic data for now. */ for (l = di->next_di; l; l = l->next) { next_di = l->data; srd_inst_start(next_di, args); } return SRD_OK; } /** * Run the specified decoder function. * * @param start_samplenum The starting sample number for the buffer's sample * set, relative to the start of capture. * @param di The decoder instance to call. Must not be NULL. * @param inbuf The buffer to decode. Must not be NULL. * @param inbuflen Length of the buffer. Must be > 0. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @private * * @since 0.1.0 */ SRD_PRIV int srd_inst_decode(uint64_t start_samplenum, const struct srd_decoder_inst *di, const uint8_t *inbuf, uint64_t inbuflen) { PyObject *py_res; srd_logic *logic; uint64_t end_samplenum; srd_dbg("Calling decode() on instance %s with %" PRIu64 " bytes " "starting at sample %" PRIu64 ".", di->inst_id, inbuflen, start_samplenum); /* Return an error upon unusable input. */ if (!di) { srd_dbg("empty decoder instance"); return SRD_ERR_ARG; } if (!inbuf) { srd_dbg("NULL buffer pointer"); return SRD_ERR_ARG; } if (inbuflen == 0) { srd_dbg("empty buffer"); return SRD_ERR_ARG; } /* * Create new srd_logic object. Each iteration around the PD's loop * will fill one sample into this object. */ logic = PyObject_New(srd_logic, &srd_logic_type); Py_INCREF(logic); logic->di = (struct srd_decoder_inst *)di; logic->start_samplenum = start_samplenum; logic->itercnt = 0; logic->inbuf = (uint8_t *)inbuf; logic->inbuflen = inbuflen; logic->sample = PyList_New(2); Py_INCREF(logic->sample); Py_IncRef(di->py_inst); end_samplenum = start_samplenum + inbuflen / di->data_unitsize; if (!(py_res = PyObject_CallMethod(di->py_inst, "decode", "KKO", logic->start_samplenum, end_samplenum, logic))) { srd_exception_catch("Protocol decoder instance %s: ", di->inst_id); return SRD_ERR_PYTHON; } Py_DecRef(py_res); return SRD_OK; } /** @private */ SRD_PRIV void srd_inst_free(struct srd_decoder_inst *di) { GSList *l; struct srd_pd_output *pdo; srd_dbg("Freeing instance %s", di->inst_id); Py_DecRef(di->py_inst); g_free(di->inst_id); g_free(di->dec_probemap); g_slist_free(di->next_di); for (l = di->pd_output; l; l = l->next) { pdo = l->data; g_free(pdo->proto_id); g_free(pdo); } g_slist_free(di->pd_output); g_free(di); } /** @private */ SRD_PRIV void srd_inst_free_all(struct srd_session *sess, GSList *stack) { GSList *l; struct srd_decoder_inst *di; if (session_is_valid(sess) != SRD_OK) { srd_err("Invalid session."); return; } di = NULL; for (l = stack ? stack : sess->di_list; di == NULL && l != NULL; l = l->next) { di = l->data; if (di->next_di) srd_inst_free_all(sess, di->next_di); srd_inst_free(di); } if (!stack) { g_slist_free(sess->di_list); sess->di_list = NULL; } } /** @} */ /** * @defgroup grp_session Session handling * * Starting and handling decoding sessions. * * @{ */ static int session_is_valid(struct srd_session *sess) { if (!sess || sess->session_id < 1) return SRD_ERR; return SRD_OK; } /** * Create a decoding session. * * A session holds all decoder instances, their stack relationships and * output callbacks. * * @param sess A pointer which will hold a pointer to a newly * initialized session on return. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @since 0.3.0 */ SRD_API int srd_session_new(struct srd_session **sess) { if (!sess) { srd_err("Invalid session pointer."); return SRD_ERR_ARG; } if (!(*sess = g_try_malloc(sizeof(struct srd_session)))) return SRD_ERR_MALLOC; (*sess)->session_id = ++max_session_id; (*sess)->num_probes = (*sess)->unitsize = (*sess)->samplerate = 0; (*sess)->di_list = (*sess)->callbacks = NULL; /* Keep a list of all sessions, so we can clean up as needed. */ sessions = g_slist_append(sessions, *sess); srd_dbg("Created session %d.", (*sess)->session_id); return SRD_OK; } /** * Start a decoding session. * * Decoders, instances and stack must have been prepared beforehand, * and all SRD_CONF parameters set. * * @param sess The session to start. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @since 0.1.0 (the API changed in 0.3.0, though) */ SRD_API int srd_session_start(struct srd_session *sess) { PyObject *args; GSList *d; struct srd_decoder_inst *di; int ret; if (session_is_valid(sess) != SRD_OK) { srd_err("Invalid session pointer."); return SRD_ERR; } if (sess->num_probes == 0) { srd_err("Session has invalid number of probes."); return SRD_ERR; } if (sess->unitsize == 0) { srd_err("Session has invalid unitsize."); return SRD_ERR; } if (sess->samplerate == 0) { srd_err("Session has invalid samplerate."); return SRD_ERR; } ret = SRD_OK; srd_dbg("Calling start() on all instances in session %d with " "%" PRIu64 " probes, unitsize %" PRIu64 ", samplerate %" PRIu64 ".", sess->session_id, sess->num_probes, sess->unitsize, sess->samplerate); /* * Currently only one item of metadata is passed along to decoders, * samplerate. This can be extended as needed. */ if (!(args = Py_BuildValue("{s:l}", "samplerate", (long)sess->samplerate))) { srd_err("Unable to build Python object for metadata."); return SRD_ERR_PYTHON; } /* Run the start() method on all decoders receiving frontend data. */ for (d = sess->di_list; d; d = d->next) { di = d->data; di->data_num_probes = sess->num_probes; di->data_unitsize = sess->unitsize; di->data_samplerate = sess->samplerate; if ((ret = srd_inst_start(di, args)) != SRD_OK) break; } Py_DecRef(args); return ret; } /** * Set a configuration key in a session. * * @param sess The session to configure. * @param key The configuration key (SRD_CONF_*). * @param data The new value for the key, as a GVariant with GVariantType * appropriate to that key. A floating reference can be passed * in; its refcount will be sunk and unreferenced after use. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @since 0.3.0 */ SRD_API int srd_session_config_set(struct srd_session *sess, int key, GVariant *data) { if (session_is_valid(sess) != SRD_OK) { srd_err("Invalid session."); return SRD_ERR_ARG; } if (!data) { srd_err("Invalid config data."); return SRD_ERR_ARG; } if (!g_variant_is_of_type(data, G_VARIANT_TYPE_UINT64)) { srd_err("Value for key %d should be of type uint64.", key); return SRD_ERR_ARG; } switch (key) { case SRD_CONF_NUM_PROBES: sess->num_probes = g_variant_get_uint64(data); break; case SRD_CONF_UNITSIZE: sess->unitsize = g_variant_get_uint64(data); break; case SRD_CONF_SAMPLERATE: sess->samplerate = g_variant_get_uint64(data); break; default: srd_err("Cannot set config for unknown key %d.", key); return SRD_ERR_ARG; } g_variant_unref(data); return SRD_OK; } /** * Send a chunk of logic sample data to a running decoder session. * * @param sess The session to use. * @param start_samplenum The sample number of the first sample in this chunk. * @param inbuf Pointer to sample data. * @param inbuflen Length in bytes of the buffer. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @since 0.1.0 */ SRD_API int srd_session_send(struct srd_session *sess, uint64_t start_samplenum, const uint8_t *inbuf, uint64_t inbuflen) { GSList *d; int ret; if (session_is_valid(sess) != SRD_OK) { srd_err("Invalid session."); return SRD_ERR_ARG; } srd_dbg("Calling decode() on all instances with starting sample " "number %" PRIu64 ", %" PRIu64 " bytes at 0x%p", start_samplenum, inbuflen, inbuf); for (d = sess->di_list; d; d = d->next) { if ((ret = srd_inst_decode(start_samplenum, d->data, inbuf, inbuflen)) != SRD_OK) return ret; } return SRD_OK; } /** * Destroy a decoding session. * * All decoder instances and output callbacks are properly released. * * @param sess The session to be destroyed. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @since 0.3.0 */ SRD_API int srd_session_destroy(struct srd_session *sess) { int session_id; if (!sess) { srd_err("Invalid session."); return SRD_ERR_ARG; } session_id = sess->session_id; if (sess->di_list) srd_inst_free_all(sess, NULL); if (sess->callbacks) g_slist_free_full(sess->callbacks, g_free); sessions = g_slist_remove(sessions, sess); g_free(sess); srd_dbg("Destroyed session %d.", session_id); return SRD_OK; } /** * Register/add a decoder output callback function. * * The function will be called when a protocol decoder sends output back * to the PD controller (except for Python objects, which only go up the * stack). * * @param sess The output session in which to register the callback. * @param output_type The output type this callback will receive. Only one * callback per output type can be registered. * @param cb The function to call. Must not be NULL. * @param cb_data Private data for the callback function. Can be NULL. * * @since 0.1.0 (the API changed in 0.3.0, though) */ SRD_API int srd_pd_output_callback_add(struct srd_session *sess, int output_type, srd_pd_output_callback_t cb, void *cb_data) { struct srd_pd_callback *pd_cb; if (session_is_valid(sess) != SRD_OK) { srd_err("Invalid session."); return SRD_ERR_ARG; } srd_dbg("Registering new callback for output type %d.", output_type); if (!(pd_cb = g_try_malloc(sizeof(struct srd_pd_callback)))) { srd_err("Failed to g_malloc() struct srd_pd_callback."); return SRD_ERR_MALLOC; } pd_cb->output_type = output_type; pd_cb->cb = cb; pd_cb->cb_data = cb_data; sess->callbacks = g_slist_append(sess->callbacks, pd_cb); return SRD_OK; } /** @private */ SRD_PRIV struct srd_pd_callback *srd_pd_output_callback_find( struct srd_session *sess, int output_type) { GSList *l; struct srd_pd_callback *tmp, *pd_cb; if (session_is_valid(sess) != SRD_OK) { srd_err("Invalid session."); return NULL; } pd_cb = NULL; for (l = sess->callbacks; l; l = l->next) { tmp = l->data; if (tmp->output_type == output_type) { pd_cb = tmp; break; } } return pd_cb; } /* This is the backend function to Python sigrokdecode.add() call. */ /** @private */ SRD_PRIV int srd_inst_pd_output_add(struct srd_decoder_inst *di, int output_type, const char *proto_id) { struct srd_pd_output *pdo; srd_dbg("Instance %s creating new output type %d for %s.", di->inst_id, output_type, proto_id); if (!(pdo = g_try_malloc(sizeof(struct srd_pd_output)))) { srd_err("Failed to g_malloc() struct srd_pd_output."); return -1; } /* pdo_id is just a simple index, nothing is deleted from this list anyway. */ pdo->pdo_id = g_slist_length(di->pd_output); pdo->output_type = output_type; pdo->di = di; pdo->proto_id = g_strdup(proto_id); di->pd_output = g_slist_append(di->pd_output, pdo); return pdo->pdo_id; } /** @} */