X-Git-Url: http://sigrok.org/gitweb/?a=blobdiff_plain;f=session.c;fp=session.c;h=109ede10516251c8079d40ce67575532013867f4;hb=fe9d91a88a8896ef04d12682720943b237c0a295;hp=0000000000000000000000000000000000000000;hpb=2aa72348627817f068b6e1862727025a7cb5b662;p=libsigrokdecode.git diff --git a/session.c b/session.c new file mode 100644 index 0000000..109ede1 --- /dev/null +++ b/session.c @@ -0,0 +1,334 @@ +/* + * This file is part of the libsigrokdecode project. + * + * Copyright (C) 2010 Uwe Hermann + * Copyright (C) 2013 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 + +/** + * @file + * + * Session handling. + */ + +/** + * @defgroup grp_session Session handling + * + * Starting and handling decoding sessions. + * + * @{ + */ + +/** @cond PRIVATE */ + +SRD_PRIV GSList *sessions = NULL; +int max_session_id = -1; + +/** @endcond */ + +/** @private */ +SRD_PRIV 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)->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 0.3.0 + */ +SRD_API int srd_session_start(struct srd_session *sess) +{ + GSList *d; + struct srd_decoder_inst *di; + int ret; + + if (session_is_valid(sess) != SRD_OK) { + srd_err("Invalid session pointer."); + return SRD_ERR; + } + + srd_dbg("Calling start() on all instances in session %d.", sess->session_id); + + /* Run the start() method on all decoders receiving frontend data. */ + ret = SRD_OK; + for (d = sess->di_list; d; d = d->next) { + di = d->data; + if ((ret = srd_inst_start(di)) != SRD_OK) + break; + } + + return ret; +} + +/** @private */ +SRD_PRIV int srd_inst_send_meta(struct srd_decoder_inst *di, int key, + GVariant *data) +{ + PyObject *py_ret; + + if (key != SRD_CONF_SAMPLERATE) + /* This is the only key we pass on to the decoder for now. */ + return SRD_OK; + + if (!PyObject_HasAttrString(di->py_inst, "metadata")) + /* This decoder doesn't want metadata, that's fine. */ + return SRD_OK; + + py_ret = PyObject_CallMethod(di->py_inst, "metadata", "lK", + (long)SRD_CONF_SAMPLERATE, + (unsigned long long)g_variant_get_uint64(data)); + Py_XDECREF(py_ret); + + return SRD_OK; +} + +/** + * Set a metadata 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_metadata_set(struct srd_session *sess, int key, + GVariant *data) +{ + GSList *l; + int ret; + + if (session_is_valid(sess) != SRD_OK) { + srd_err("Invalid session."); + return SRD_ERR_ARG; + } + + if (key != SRD_CONF_SAMPLERATE) { + srd_err("Unknown config key %d.", key); + return SRD_ERR_ARG; + } + + srd_dbg("Setting session %d samplerate to %"PRIu64".", + sess->session_id, g_variant_get_uint64(data)); + + ret = SRD_OK; + for (l = sess->di_list; l; l = l->next) { + if ((ret = srd_inst_send_meta(l->data, key, data)) != SRD_OK) + break; + } + + g_variant_unref(data); + + return ret; +} + +/** + * Send a chunk of logic sample data to a running decoder session. + * + * The logic samples must be arranged in probe order, in the least + * amount of space possible. If no probes were configured, the default + * probe set consists of all required probes + all optional probes. + * + * The size of a sample in inbuf is the minimum number of bytes needed + * to store the configured (or default) probes. + * + * @param sess The session to use. + * @param start_samplenum The sample number of the first sample in this chunk. + * @param end_samplenum The sample number of the last 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 0.3.0 + */ +SRD_API int srd_session_send(struct srd_session *sess, + uint64_t start_samplenum, uint64_t end_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(d->data, start_samplenum, + end_samplenum, 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 0.3.0 + */ +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; +} + +/** @} */