[libsigrokdecode.git] / session.c

/*
 * This file is part of the libsigrokdecode project.
 *
 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
 *
 * 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 <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
#include "libsigrokdecode.h"
#include <inttypes.h>
#include <glib.h>

/**
 * @file
 *
 * Session handling.
 */

/**
 * @defgroup grp_session Session handling
 *
 * Starting and handling decoding sessions.
 *
 * @{
 */

/** @cond PRIVATE */

SRD_PRIV GSList *sessions = NULL;
SRD_PRIV int max_session_id = -1;

/** @endcond */

/**
 * 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. Must not be NULL.
 *
 * @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)
		return SRD_ERR_ARG;

	*sess = g_malloc(sizeof(struct srd_session));
	(*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("Creating 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. Must not be NULL.
 *
 * @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 (!sess)
		return SRD_ERR_ARG;

	srd_dbg("Calling start() of all instances in session %d.", sess->session_id);

	/* Run the start() method of 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;
}

static int srd_inst_send_meta(struct srd_decoder_inst *di, int key,
		GVariant *data)
{
	PyObject *py_ret;
	GSList *l;
	struct srd_decoder_inst *next_di;
	int ret;
	PyGILState_STATE gstate;

	if (key != SRD_CONF_SAMPLERATE)
		/* This is the only key we pass on to the decoder for now. */
		return SRD_OK;

	gstate = PyGILState_Ensure();

	if (PyObject_HasAttrString(di->py_inst, "metadata")) {
		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);
	}

	PyGILState_Release(gstate);

	/* Push metadata to all the PDs stacked on top of this one. */
	for (l = di->next_di; l; l = l->next) {
		next_di = l->data;
		if ((ret = srd_inst_send_meta(next_di, key, data)) != SRD_OK)
			return ret;
	}

	return SRD_OK;
}

/**
 * Set a metadata configuration key in a session.
 *
 * @param sess The session to configure. Must not be NULL.
 * @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 (!sess)
		return SRD_ERR_ARG;

	if (!key) {
		srd_err("Invalid key.");
		return SRD_ERR_ARG;
	}

	if (!data) {
		srd_err("Invalid value.");
		return SRD_ERR_ARG;
	}

	/* Hardcoded to samplerate/uint64 for now. */

	if (key != SRD_CONF_SAMPLERATE) {
		srd_err("Unknown config key %d.", key);
		return SRD_ERR_ARG;
	}
	if (!g_variant_is_of_type(data, G_VARIANT_TYPE_UINT64)) {
		srd_err("Invalid value type: expected uint64, got %s",
				g_variant_get_type_string(data));
		return SRD_ERR_ARG;
	}

	srd_dbg("Setting session %d samplerate to %"G_GUINT64_FORMAT".",
			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.
 *
 * If no channel map has been set up, the logic samples must be arranged
 * in channel order, in the least amount of space possible. The default
 * channel set consists of all required channels + all optional channels.
 *
 * The size of a sample in inbuf is 'unitsize' bytes. If no channel map
 * has been configured, it is the minimum number of bytes needed to store
 * the default channels.
 *
 * The calls to this function must provide the samples that shall be
 * used by the protocol decoder
 *  - in the correct order ([...]5, 6, 4, 7, 8[...] is a bug),
 *  - starting from sample zero (2, 3, 4, 5, 6[...] is a bug),
 *  - consecutively, with no gaps (0, 1, 2, 4, 5[...] is a bug).
 *
 * The start- and end-sample numbers are absolute sample numbers (relative
 * to the start of the whole capture/file/stream), i.e. they are not relative
 * sample numbers within the chunk specified by 'inbuf' and 'inbuflen'.
 *
 * Correct example (4096 samples total, 4 chunks @ 1024 samples each):
 *   srd_session_send(s, 0,    1023, inbuf, 1024, 1);
 *   srd_session_send(s, 1024, 2047, inbuf, 1024, 1);
 *   srd_session_send(s, 2048, 3071, inbuf, 1024, 1);
 *   srd_session_send(s, 3072, 4095, inbuf, 1024, 1);
 *
 * The chunk size ('inbuflen') can be arbitrary and can differ between calls.
 *
 * Correct example (4096 samples total, 7 chunks @ various samples each):
 *   srd_session_send(s, 0,    1023, inbuf, 1024, 1);
 *   srd_session_send(s, 1024, 1123, inbuf,  100, 1);
 *   srd_session_send(s, 1124, 1423, inbuf,  300, 1);
 *   srd_session_send(s, 1424, 1642, inbuf,  219, 1);
 *   srd_session_send(s, 1643, 2047, inbuf,  405, 1);
 *   srd_session_send(s, 2048, 3071, inbuf, 1024, 1);
 *   srd_session_send(s, 3072, 4095, inbuf, 1024, 1);
 *
 * INCORRECT example (4096 samples total, 4 chunks @ 1024 samples each, but
 * the start- and end-samplenumbers are not absolute):
 *   srd_session_send(s, 0,    1023, inbuf, 1024, 1);
 *   srd_session_send(s, 0,    1023, inbuf, 1024, 1);
 *   srd_session_send(s, 0,    1023, inbuf, 1024, 1);
 *   srd_session_send(s, 0,    1023, inbuf, 1024, 1);
 *
 * @param sess The session to use. Must not be NULL.
 * @param abs_start_samplenum The absolute starting sample number for the
 *              buffer's sample set, relative to the start of capture.
 * @param abs_end_samplenum The absolute ending sample number for the
 *              buffer's sample set, relative to the start of capture.
 * @param inbuf Pointer to sample data. Must not be NULL.
 * @param inbuflen Length in bytes of the buffer. Must be > 0.
 * @param unitsize The number of bytes per sample. Must be > 0.
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 *
 * @since 0.4.0
 */
SRD_API int srd_session_send(struct srd_session *sess,
		uint64_t abs_start_samplenum, uint64_t abs_end_samplenum,
		const uint8_t *inbuf, uint64_t inbuflen, uint64_t unitsize)
{
	GSList *d;
	int ret;

	if (!sess)
		return SRD_ERR_ARG;

	for (d = sess->di_list; d; d = d->next) {
		if ((ret = srd_inst_decode(d->data, abs_start_samplenum,
				abs_end_samplenum, inbuf, inbuflen, unitsize)) != SRD_OK)
			return ret;
	}

	return SRD_OK;
}

/**
 * Terminate currently executing decoders in a session, reset internal state.
 *
 * All decoder instances have their .wait() method terminated, which
 * shall terminate .decode() as well. Afterwards the decoders' optional
 * .reset() method gets executed.
 *
 * This routine allows callers to abort pending expensive operations,
 * when they are no longer interested in the decoders' results. Note
 * that the decoder state is lost and aborted work cannot resume.
 *
 * This routine also allows callers to re-use previously created decoder
 * stacks to process new input data which is not related to previously
 * processed input data. This avoids the necessity to re-construct the
 * decoder stack.
 *
 * @param sess The session in which to terminate decoders. Must not be NULL.
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 *
 * @since 0.5.1
 */
SRD_API int srd_session_terminate_reset(struct srd_session *sess)
{
	GSList *d;
	int ret;

	if (!sess)
		return SRD_ERR_ARG;

	for (d = sess->di_list; d; d = d->next) {
		ret = srd_inst_terminate_reset(d->data);
		if (ret != 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. Must not be NULL.
 *
 * @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)
		return SRD_ERR_ARG;

	session_id = sess->session_id;
	if (sess->di_list)
		srd_inst_free_all(sess);
	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.
 *             Must not be NULL.
 * @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 cb, void *cb_data)
{
	struct srd_pd_callback *pd_cb;

	if (!sess)
		return SRD_ERR_ARG;

	srd_dbg("Registering new callback for output type %s.",
		output_type_name(output_type));

	pd_cb = g_malloc(sizeof(struct srd_pd_callback));
	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 (!sess)
		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;
}

/** @} */
Commit	Line	Data
fe9d91a8 BV	1	/*
	2	* This file is part of the libsigrokdecode project.
	3	*
	4	* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
	5	* Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
	6	*
	7	* This program is free software: you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation, either version 3 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
36784362	21	#include <config.h>
f6c7eade MC	22	#include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
f6c7eade MC	23	#include "libsigrokdecode.h"
d95f2888	24	#include <inttypes.h>
fe9d91a8 BV	25	#include <glib.h>
	26
	27	/**
	28	* @file
	29	*
	30	* Session handling.
	31	*/
	32
	33	/**
	34	* @defgroup grp_session Session handling
	35	*
	36	* Starting and handling decoding sessions.
	37	*
	38	* @{
	39	*/
	40
	41	/** @cond PRIVATE */
	42
	43	SRD_PRIV GSList *sessions = NULL;
23a29d24	44	SRD_PRIV int max_session_id = -1;
fe9d91a8 BV	45
	46	/** @endcond */
	47
fe9d91a8 BV	48	/**
	49	* Create a decoding session.
	50	*
	51	* A session holds all decoder instances, their stack relationships and
	52	* output callbacks.
	53	*
	54	* @param sess A pointer which will hold a pointer to a newly
4ccebbd3	55	* initialized session on return. Must not be NULL.
fe9d91a8 BV	56	*
	57	* @return SRD_OK upon success, a (negative) error code otherwise.
	58	*
	59	* @since 0.3.0
	60	*/
	61	SRD_API int srd_session_new(struct srd_session **sess)
	62	{
4ccebbd3	63	if (!sess)
fe9d91a8	64	return SRD_ERR_ARG;
fe9d91a8	65
077fa8ac	66	*sess = g_malloc(sizeof(struct srd_session));
fe9d91a8 BV	67	(*sess)->session_id = ++max_session_id;
	68	(sess)->di_list = (sess)->callbacks = NULL;
	69
	70	/* Keep a list of all sessions, so we can clean up as needed. */
	71	sessions = g_slist_append(sessions, *sess);
	72
755e4a1e	73	srd_dbg("Creating session %d.", (*sess)->session_id);
fe9d91a8 BV	74
	75	return SRD_OK;
	76	}
	77
	78	/**
	79	* Start a decoding session.
	80	*
	81	* Decoders, instances and stack must have been prepared beforehand,
	82	* and all SRD_CONF parameters set.
	83	*
4ccebbd3	84	* @param sess The session to start. Must not be NULL.
fe9d91a8 BV	85	*
	86	* @return SRD_OK upon success, a (negative) error code otherwise.
	87	*
	88	* @since 0.3.0
	89	*/
	90	SRD_API int srd_session_start(struct srd_session *sess)
	91	{
	92	GSList *d;
	93	struct srd_decoder_inst *di;
	94	int ret;
	95
4ccebbd3 UH	96	if (!sess)
4ccebbd3 UH	97	return SRD_ERR_ARG;
fe9d91a8	98
755e4a1e	99	srd_dbg("Calling start() of all instances in session %d.", sess->session_id);
fe9d91a8	100
755e4a1e	101	/* Run the start() method of all decoders receiving frontend data. */
fe9d91a8 BV	102	ret = SRD_OK;
	103	for (d = sess->di_list; d; d = d->next) {
	104	di = d->data;
	105	if ((ret = srd_inst_start(di)) != SRD_OK)
	106	break;
	107	}
	108
	109	return ret;
	110	}
	111
4467372a	112	static int srd_inst_send_meta(struct srd_decoder_inst *di, int key,
fe9d91a8 BV	113	GVariant *data)
	114	{
	115	PyObject *py_ret;
937e4c51 SB	116	GSList *l;
	117	struct srd_decoder_inst *next_di;
	118	int ret;
514b2edc	119	PyGILState_STATE gstate;
fe9d91a8 BV	120
	121	if (key != SRD_CONF_SAMPLERATE)
	122	/* This is the only key we pass on to the decoder for now. */
	123	return SRD_OK;
	124
514b2edc UH	125	gstate = PyGILState_Ensure();
514b2edc UH	126
937e4c51 SB	127	if (PyObject_HasAttrString(di->py_inst, "metadata")) {
	128	py_ret = PyObject_CallMethod(di->py_inst, "metadata", "lK",
	129	(long)SRD_CONF_SAMPLERATE,
	130	(unsigned long long)g_variant_get_uint64(data));
	131	Py_XDECREF(py_ret);
	132	}
fe9d91a8	133
514b2edc UH	134	PyGILState_Release(gstate);
514b2edc UH	135
937e4c51 SB	136	/* Push metadata to all the PDs stacked on top of this one. */
	137	for (l = di->next_di; l; l = l->next) {
	138	next_di = l->data;
	139	if ((ret = srd_inst_send_meta(next_di, key, data)) != SRD_OK)
	140	return ret;
	141	}
fe9d91a8 BV	142
	143	return SRD_OK;
	144	}
	145
	146	/**
	147	* Set a metadata configuration key in a session.
	148	*
4ccebbd3	149	* @param sess The session to configure. Must not be NULL.
fe9d91a8 BV	150	* @param key The configuration key (SRD_CONF_*).
	151	* @param data The new value for the key, as a GVariant with GVariantType
	152	* appropriate to that key. A floating reference can be passed
	153	* in; its refcount will be sunk and unreferenced after use.
	154	*
	155	* @return SRD_OK upon success, a (negative) error code otherwise.
	156	*
	157	* @since 0.3.0
	158	*/
	159	SRD_API int srd_session_metadata_set(struct srd_session *sess, int key,
	160	GVariant *data)
	161	{
	162	GSList *l;
	163	int ret;
	164
4ccebbd3	165	if (!sess)
fe9d91a8	166	return SRD_ERR_ARG;
fe9d91a8	167
ca27aa8f BV	168	if (!key) {
	169	srd_err("Invalid key.");
	170	return SRD_ERR_ARG;
	171	}
	172
	173	if (!data) {
	174	srd_err("Invalid value.");
	175	return SRD_ERR_ARG;
	176	}
	177
	178	/* Hardcoded to samplerate/uint64 for now. */
	179
fe9d91a8 BV	180	if (key != SRD_CONF_SAMPLERATE) {
	181	srd_err("Unknown config key %d.", key);
	182	return SRD_ERR_ARG;
	183	}
ca27aa8f BV	184	if (!g_variant_is_of_type(data, G_VARIANT_TYPE_UINT64)) {
	185	srd_err("Invalid value type: expected uint64, got %s",
	186	g_variant_get_type_string(data));
	187	return SRD_ERR_ARG;
	188	}
fe9d91a8	189
23e806c2	190	srd_dbg("Setting session %d samplerate to %"G_GUINT64_FORMAT".",
fe9d91a8 BV	191	sess->session_id, g_variant_get_uint64(data));
	192
	193	ret = SRD_OK;
	194	for (l = sess->di_list; l; l = l->next) {
	195	if ((ret = srd_inst_send_meta(l->data, key, data)) != SRD_OK)
	196	break;
	197	}
	198
	199	g_variant_unref(data);
	200
	201	return ret;
	202	}
	203
	204	/**
	205	* Send a chunk of logic sample data to a running decoder session.
	206	*
6a15597a UH	207	* If no channel map has been set up, the logic samples must be arranged
	208	* in channel order, in the least amount of space possible. The default
	209	* channel set consists of all required channels + all optional channels.
fe9d91a8	210	*
cda2d36c UH	211	* The size of a sample in inbuf is 'unitsize' bytes. If no channel map
	212	* has been configured, it is the minimum number of bytes needed to store
	213	* the default channels.
fe9d91a8	214	*
4564e8e5 UH	215	* The calls to this function must provide the samples that shall be
	216	* used by the protocol decoder
	217	* - in the correct order ([...]5, 6, 4, 7, 8[...] is a bug),
	218	* - starting from sample zero (2, 3, 4, 5, 6[...] is a bug),
	219	* - consecutively, with no gaps (0, 1, 2, 4, 5[...] is a bug).
	220	*
	221	* The start- and end-sample numbers are absolute sample numbers (relative
	222	* to the start of the whole capture/file/stream), i.e. they are not relative
	223	* sample numbers within the chunk specified by 'inbuf' and 'inbuflen'.
	224	*
	225	* Correct example (4096 samples total, 4 chunks @ 1024 samples each):
	226	* srd_session_send(s, 0, 1023, inbuf, 1024, 1);
	227	* srd_session_send(s, 1024, 2047, inbuf, 1024, 1);
	228	* srd_session_send(s, 2048, 3071, inbuf, 1024, 1);
	229	* srd_session_send(s, 3072, 4095, inbuf, 1024, 1);
	230	*
	231	* The chunk size ('inbuflen') can be arbitrary and can differ between calls.
	232	*
	233	* Correct example (4096 samples total, 7 chunks @ various samples each):
	234	* srd_session_send(s, 0, 1023, inbuf, 1024, 1);
	235	* srd_session_send(s, 1024, 1123, inbuf, 100, 1);
	236	* srd_session_send(s, 1124, 1423, inbuf, 300, 1);
	237	* srd_session_send(s, 1424, 1642, inbuf, 219, 1);
	238	* srd_session_send(s, 1643, 2047, inbuf, 405, 1);
	239	* srd_session_send(s, 2048, 3071, inbuf, 1024, 1);
	240	* srd_session_send(s, 3072, 4095, inbuf, 1024, 1);
	241	*
	242	* INCORRECT example (4096 samples total, 4 chunks @ 1024 samples each, but
	243	* the start- and end-samplenumbers are not absolute):
	244	* srd_session_send(s, 0, 1023, inbuf, 1024, 1);
	245	* srd_session_send(s, 0, 1023, inbuf, 1024, 1);
	246	* srd_session_send(s, 0, 1023, inbuf, 1024, 1);
	247	* srd_session_send(s, 0, 1023, inbuf, 1024, 1);
	248	*
e27347a4	249	* @param sess The session to use. Must not be NULL.
4564e8e5 UH	250	* @param abs_start_samplenum The absolute starting sample number for the
	251	* buffer's sample set, relative to the start of capture.
	252	* @param abs_end_samplenum The absolute ending sample number for the
	253	* buffer's sample set, relative to the start of capture.
e27347a4 UH	254	* @param inbuf Pointer to sample data. Must not be NULL.
	255	* @param inbuflen Length in bytes of the buffer. Must be > 0.
	256	* @param unitsize The number of bytes per sample. Must be > 0.
fe9d91a8 BV	257	*
	258	* @return SRD_OK upon success, a (negative) error code otherwise.
	259	*
cda2d36c	260	* @since 0.4.0
fe9d91a8 BV	261	*/
fe9d91a8 BV	262	SRD_API int srd_session_send(struct srd_session *sess,
4564e8e5	263	uint64_t abs_start_samplenum, uint64_t abs_end_samplenum,
cda2d36c	264	const uint8_t *inbuf, uint64_t inbuflen, uint64_t unitsize)
fe9d91a8 BV	265	{
	266	GSList *d;
	267	int ret;
	268
4ccebbd3	269	if (!sess)
fe9d91a8	270	return SRD_ERR_ARG;
fe9d91a8	271
fe9d91a8	272	for (d = sess->di_list; d; d = d->next) {
4564e8e5 UH	273	if ((ret = srd_inst_decode(d->data, abs_start_samplenum,
4564e8e5 UH	274	abs_end_samplenum, inbuf, inbuflen, unitsize)) != SRD_OK)
fe9d91a8 BV	275	return ret;
	276	}
	277
	278	return SRD_OK;
	279	}
	280
9553e962 GS	281	/**
	282	* Terminate currently executing decoders in a session, reset internal state.
	283	*
	284	* All decoder instances have their .wait() method terminated, which
	285	* shall terminate .decode() as well. Afterwards the decoders' optional
	286	* .reset() method gets executed.
	287	*
	288	* This routine allows callers to abort pending expensive operations,
	289	* when they are no longer interested in the decoders' results. Note
	290	* that the decoder state is lost and aborted work cannot resume.
	291	*
	292	* This routine also allows callers to re-use previously created decoder
	293	* stacks to process new input data which is not related to previously
	294	* processed input data. This avoids the necessity to re-construct the
	295	* decoder stack.
	296	*
4ccebbd3 UH	297	* @param sess The session in which to terminate decoders. Must not be NULL.
4ccebbd3 UH	298	*
9553e962 GS	299	* @return SRD_OK upon success, a (negative) error code otherwise.
9553e962 GS	300	*
3a063627	301	* @since 0.5.1
9553e962 GS	302	*/
	303	SRD_API int srd_session_terminate_reset(struct srd_session *sess)
	304	{
	305	GSList *d;
	306	int ret;
	307
4ccebbd3	308	if (!sess)
9553e962	309	return SRD_ERR_ARG;
9553e962 GS	310
	311	for (d = sess->di_list; d; d = d->next) {
	312	ret = srd_inst_terminate_reset(d->data);
	313	if (ret != SRD_OK)
	314	return ret;
	315	}
7969d803	316
9553e962 GS	317	return SRD_OK;
	318	}
	319
fe9d91a8 BV	320	/**
	321	* Destroy a decoding session.
	322	*
	323	* All decoder instances and output callbacks are properly released.
	324	*
4ccebbd3	325	* @param sess The session to be destroyed. Must not be NULL.
fe9d91a8 BV	326	*
	327	* @return SRD_OK upon success, a (negative) error code otherwise.
	328	*
	329	* @since 0.3.0
	330	*/
	331	SRD_API int srd_session_destroy(struct srd_session *sess)
	332	{
	333	int session_id;
	334
4ccebbd3	335	if (!sess)
fe9d91a8	336	return SRD_ERR_ARG;
fe9d91a8 BV	337
	338	session_id = sess->session_id;
	339	if (sess->di_list)
3262ef02	340	srd_inst_free_all(sess);
fe9d91a8 BV	341	if (sess->callbacks)
	342	g_slist_free_full(sess->callbacks, g_free);
	343	sessions = g_slist_remove(sessions, sess);
	344	g_free(sess);
	345
	346	srd_dbg("Destroyed session %d.", session_id);
	347
	348	return SRD_OK;
	349	}
	350
	351	/**
	352	* Register/add a decoder output callback function.
	353	*
	354	* The function will be called when a protocol decoder sends output back
	355	* to the PD controller (except for Python objects, which only go up the
	356	* stack).
	357	*
	358	* @param sess The output session in which to register the callback.
4ccebbd3	359	* Must not be NULL.
fe9d91a8 BV	360	* @param output_type The output type this callback will receive. Only one
	361	* callback per output type can be registered.
	362	* @param cb The function to call. Must not be NULL.
	363	* @param cb_data Private data for the callback function. Can be NULL.
	364	*
	365	* @since 0.3.0
	366	*/
	367	SRD_API int srd_pd_output_callback_add(struct srd_session *sess,
2372b199	368	int output_type, srd_pd_output_callback cb, void *cb_data)
fe9d91a8 BV	369	{
	370	struct srd_pd_callback *pd_cb;
	371
4ccebbd3	372	if (!sess)
fe9d91a8	373	return SRD_ERR_ARG;
fe9d91a8	374
5c723a57 UH	375	srd_dbg("Registering new callback for output type %s.",
5c723a57 UH	376	output_type_name(output_type));
fe9d91a8	377
077fa8ac	378	pd_cb = g_malloc(sizeof(struct srd_pd_callback));
fe9d91a8 BV	379	pd_cb->output_type = output_type;
	380	pd_cb->cb = cb;
	381	pd_cb->cb_data = cb_data;
	382	sess->callbacks = g_slist_append(sess->callbacks, pd_cb);
	383
	384	return SRD_OK;
	385	}
	386
	387	/** @private */
	388	SRD_PRIV struct srd_pd_callback *srd_pd_output_callback_find(
	389	struct srd_session *sess, int output_type)
	390	{
	391	GSList *l;
	392	struct srd_pd_callback tmp, pd_cb;
	393
4ccebbd3	394	if (!sess)
fe9d91a8	395	return NULL;
fe9d91a8 BV	396
	397	pd_cb = NULL;
	398	for (l = sess->callbacks; l; l = l->next) {
	399	tmp = l->data;
	400	if (tmp->output_type == output_type) {
	401	pd_cb = tmp;
	402	break;
	403	}
	404	}
	405
	406	return pd_cb;
	407	}
	408
	409	/** @} */