decode.c

/*
 * This file is part of the sigrok-cli project.
 *
 * 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 <stdlib.h>
#include <string.h>
#include <glib.h>
#include "sigrok-cli.h"

#ifdef HAVE_SRD
static GHashTable *pd_ann_visible = NULL;
static GHashTable *pd_meta_visible = NULL;
static GHashTable *pd_binary_visible = NULL;
static GHashTable *pd_channel_maps = NULL;

uint64_t pd_samplerate = 0;

extern struct srd_session *srd_sess;

static const char *keyword_assign = "assign_channels";
static const char *assign_by_index = "auto_index";
static const char *assign_by_name = "auto_names";

static int opts_to_gvar(struct srd_decoder *dec, GHashTable *hash,
		GHashTable **options)
{
	struct srd_decoder_option *o;
	GSList *optl;
	GVariant *gvar;
	gint64 val_int;
	double val_dbl;
	int ret;
	char *val_str, *conv;

	ret = TRUE;
	*options = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
			(GDestroyNotify)g_variant_unref);

	for (optl = dec->options; optl; optl = optl->next) {
		o = optl->data;
		if (!(val_str = g_hash_table_lookup(hash, o->id)))
			/* Not specified. */
			continue;
		if (g_variant_is_of_type(o->def, G_VARIANT_TYPE_STRING)) {
			gvar = g_variant_new_string(val_str);
		} else if (g_variant_is_of_type(o->def, G_VARIANT_TYPE_INT64)) {
			conv = NULL;
			val_int = strtoll(val_str, &conv, 0);
			if (!conv || conv == val_str || *conv) {
				g_critical("Protocol decoder '%s' option '%s' "
						"requires a number.", dec->name, o->id);
				ret = FALSE;
				break;
			}
			gvar = g_variant_new_int64(val_int);
		} else if (g_variant_is_of_type(o->def, G_VARIANT_TYPE_DOUBLE)) {
			conv = NULL;
			val_dbl = strtod(val_str, &conv);
			if (!conv || conv == val_str || *conv) {
				g_critical("Protocol decoder '%s' option '%s' requires a float number.",
					dec->name, o->id);
				ret = FALSE;
				break;
			}
			gvar = g_variant_new_double(val_dbl);
		} else {
			g_critical("Unsupported type for option '%s' (%s)",
					o->id, g_variant_get_type_string(o->def));
			ret = FALSE;
			break;
		}
		g_variant_ref_sink(gvar);
		g_hash_table_insert(*options, g_strdup(o->id), gvar);
		g_hash_table_remove(hash, o->id);
	}

	return ret;
}

static int move_hash_element(GHashTable *src, GHashTable *dest, const void *key)
{
	void *orig_key, *value;

	if (!g_hash_table_lookup_extended(src, key, &orig_key, &value))
		/* Not specified. */
		return FALSE;
	g_hash_table_steal(src, orig_key);
	g_hash_table_insert(dest, orig_key, value);

	return TRUE;
}

static GHashTable *extract_channel_map(struct srd_decoder *dec, GHashTable *hash)
{
	GHashTable *channel_map;
	struct srd_channel *pdch;
	GSList *l;

	channel_map = g_hash_table_new_full(g_str_hash, g_str_equal,
					  g_free, g_free);

	move_hash_element(hash, channel_map, keyword_assign);
	for (l = dec->channels; l; l = l->next) {
		pdch = l->data;
		move_hash_element(hash, channel_map, pdch->id);
	}
	for (l = dec->opt_channels; l; l = l->next) {
		pdch = l->data;
		move_hash_element(hash, channel_map, pdch->id);
	}

	return channel_map;
}

static int register_pd(char *opt_pds, char *opt_pd_annotations)
{
	int ret;
	struct srd_decoder *dec;
	struct srd_decoder_inst *di, *di_prior;
	char **pdtokens, **pdtok, *pd_name;
	GHashTable *pd_opthash, *options, *channels;
	GList *leftover, *l;

	ret = 0;
	pd_name = NULL;
	di_prior = NULL;
	pd_opthash = options = channels = NULL;

	pdtokens = g_strsplit(opt_pds, ",", 0);
	for (pdtok = pdtokens; *pdtok; pdtok++) {
		if (!(pd_opthash = parse_generic_arg(*pdtok, TRUE, NULL))) {
			g_critical("Invalid protocol decoder option '%s'.", *pdtok);
			break;
		}

		pd_name = g_strdup(g_hash_table_lookup(pd_opthash, "sigrok_key"));
		g_hash_table_remove(pd_opthash, "sigrok_key");
		if (srd_decoder_load(pd_name) != SRD_OK) {
			g_critical("Failed to load protocol decoder %s.", pd_name);
			ret = 1;
			break;
		}
		if (!(dec = srd_decoder_get_by_id(pd_name))) {
			g_critical("Failed to get decoder %s by id.", pd_name);
			ret = 1;
			break;
		}

		/* Convert decoder option and channel values to GVariant. */
		if (!opts_to_gvar(dec, pd_opthash, &options)) {
			ret = 1;
			break;
		}
		channels = extract_channel_map(dec, pd_opthash);

		if (g_hash_table_size(pd_opthash) > 0) {
			leftover = g_hash_table_get_keys(pd_opthash);
			for (l = leftover; l; l = l->next)
				g_critical("Unknown option or channel '%s'", (char *)l->data);
			g_list_free(leftover);
			break;
		}

		if (!(di = srd_inst_new(srd_sess, pd_name, options))) {
			g_critical("Failed to instantiate protocol decoder %s.", pd_name);
			ret = 1;
			break;
		}

		if (pdtok == pdtokens) {
			/*
			 * Save the channel setup for later, but only on the
			 * first decoder (stacked decoders don't get channels).
			 */
			g_hash_table_insert(pd_channel_maps, g_strdup(di->inst_id), channels);
			channels = NULL;
		}

		/*
		 * If no annotation list was specified, add them all in now.
		 * This will be pared down later to leave only the last PD
		 * in the stack.
		 */
		if (!opt_pd_annotations) {
			g_hash_table_insert(pd_ann_visible, g_strdup(di->decoder->id),
					g_slist_append(NULL, GINT_TO_POINTER(-1)));
		}
		if (di_prior) {
			if (srd_inst_stack(srd_sess, di_prior, di) != SRD_OK) {
				g_critical("Failed to stack %s -> %s.",
					di_prior->inst_id, di->inst_id);
				ret = 1;
				break;
			}
			/* Remove annotations from prior levels. */
			if (!opt_pd_annotations)
				g_hash_table_remove(pd_ann_visible, di_prior->inst_id);
		}
		di_prior = di;
		g_free(pd_name);
		g_hash_table_destroy(pd_opthash);
		g_hash_table_destroy(options);
		pd_opthash = options = NULL;
	}

	if (pd_opthash)
		g_hash_table_destroy(pd_opthash);
	if (options)
		g_hash_table_destroy(options);
	if (channels)
		g_hash_table_destroy(channels);

	g_strfreev(pdtokens);

	return ret;
}

/*
 * Register all the PDs from all stacks.
 *
 * Each PD string is a single stack such as "uart:baudrate=19200,modbus".
 */
int register_pds(gchar **all_pds, char *opt_pd_annotations)
{
	int ret;

	ret = 0;
	pd_ann_visible = g_hash_table_new_full(g_str_hash, g_str_equal,
					       g_free, NULL);
	pd_channel_maps = g_hash_table_new_full(g_str_hash,
		g_str_equal, g_free, (GDestroyNotify)g_hash_table_destroy);

	for (int i = 0; all_pds[i]; i++)
		ret += register_pd(all_pds[i], opt_pd_annotations);

	return ret;
}

static void map_pd_inst_channels(void *key, void *value, void *user_data)
{
	GHashTable *channel_map;
	GHashTable *channel_indices;
	GSList *channel_list;
	struct srd_decoder_inst *di;
	struct srd_decoder *pd;
	GVariant *var;
	void *channel_id;
	void *channel_target;
	struct sr_channel *ch;
	GHashTableIter iter;
	enum assign_t {
		ASSIGN_UNKNOWN,
		ASSIGN_USER_SPEC,
		ASSIGN_BY_INDEX,
		ASSIGN_BY_NAMES,
	} assign;
	const char *keyword;
	GSList *l_pd, *l_pdo, *l_ch;
	struct srd_channel *pdch;

	channel_map = value;
	channel_list = user_data;

	di = srd_inst_find_by_id(srd_sess, key);
	if (!di) {
		g_critical("Protocol decoder instance \"%s\" not found.",
			   (char *)key);
		return;
	}
	channel_indices = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
					      (GDestroyNotify)g_variant_unref);

	/*
	 * The typical mode of operation is to apply a user specified
	 * mapping of sigrok channels to decoder inputs. Lack of mapping
	 * specs will assign no signals (compatible behaviour to earlier
	 * implementations).
	 *
	 * Alternatively we can assign sigrok logic channels to decoder
	 * inputs in the strict order of channel indices, or when their
	 * names match. Users need to request this automatic assignment
	 * though, because this behaviour differs from earlier versions.
	 *
	 * Even more sophisticated heuristics of mapping sigrok channels
	 * to decoder inputs are not implemented here. Later versions
	 * could translate the Pulseview approach to the C language, but
	 * it's better to stabilize that logic first before porting it.
	 */
	assign = ASSIGN_USER_SPEC;
	keyword = g_hash_table_lookup(channel_map, keyword_assign);
	if (g_hash_table_size(channel_map) != 1) {
		assign = ASSIGN_USER_SPEC;
	} else if (!keyword) {
		assign = ASSIGN_USER_SPEC;
	} else if (strcmp(keyword, assign_by_index) == 0) {
		assign = ASSIGN_BY_INDEX;
	} else if (strcmp(keyword, assign_by_name) == 0) {
		assign = ASSIGN_BY_NAMES;
	} else {
		g_critical("Unknown type of decoder channel assignment: %s.",
			keyword);
		return;
	}

	pd = di->decoder;
	if (assign == ASSIGN_BY_INDEX) {
		/*
		 * Iterate the protocol decoder's list of input signals
		 * (mandatory and optional, never more than the decoder's
		 * total channels count). Assign sigrok logic channels
		 * until either is exhausted. Use sigrok channels in the
		 * very order of their declaration in the input stream.
		 */
		l_ch = channel_list;
		l_pd = pd->channels;
		while (l_ch && l_pd) {
			ch = l_ch->data;
			l_ch = l_ch->next;
			if (ch->type != SR_CHANNEL_LOGIC)
				break;
			if (ch->index >= di->dec_num_channels)
				break;
			pdch = l_pd->data;
			l_pd = l_pd->next;
			if (!l_pd)
				l_pd = pd->opt_channels;
			/* TODO Emit an INFO message. */
			g_hash_table_insert(channel_map,
				g_strdup(pdch->id), g_strdup(ch->name));
		}
	} else if (assign == ASSIGN_BY_NAMES) {
		/*
		 * Iterate the protocol decoder's list of input signals.
		 * Search for sigrok logic channels that have matching
		 * names (case insensitive comparison). Not finding a
		 * sigrok channel of a given name is non-fatal (could be
		 * an optional channel, the decoder will check later for
		 * all mandatory channels to be assigned).
		 */
		l_pd = pd->channels;
		l_pdo = pd->opt_channels;
		while (l_pd) {
			pdch = l_pd->data;
			l_pd = l_pd->next;
			if (!l_pd) {
				l_pd = l_pdo;
				l_pdo = NULL;
			}
			ch = find_channel(channel_list, pdch->id, FALSE);
			if (!ch) {
				/* TODO Emit a WARN message. */
				/* if (l_pdo) ...; */
				continue;
			}
			if (ch->type != SR_CHANNEL_LOGIC) {
				/* TODO Emit a WARN message. */
				continue;
			}
			/* TODO Emit an INFO message. */
			g_hash_table_insert(channel_map,
				g_strdup(pdch->id), g_strdup(ch->name));
		}
	}

	g_hash_table_iter_init(&iter, channel_map);
	while (g_hash_table_iter_next(&iter, &channel_id, &channel_target)) {
		if (strcmp(channel_id, keyword_assign) == 0)
			continue;
		if (!channel_target) {
			g_printerr("cli: Channel name for \"%s\" missing.\n",
				   (char *)channel_id);
			continue;
		}
		ch = find_channel(channel_list, channel_target, TRUE);
		if (!ch) {
			g_printerr("cli: No channel with name \"%s\" found.\n",
				   (char *)channel_target);
			continue;
		}
		if (!ch->enabled)
			g_printerr("cli: Target channel \"%s\" not enabled.\n",
				   (char *)channel_target);

		var = g_variant_new_int32(ch->index);
		g_variant_ref_sink(var);
		g_hash_table_insert(channel_indices, g_strdup(channel_id), var);
	}

	srd_inst_channel_set_all(di, channel_indices);
	g_hash_table_destroy(channel_indices);
}

void map_pd_channels(struct sr_dev_inst *sdi)
{
	GSList *channels;

	channels = sr_dev_inst_channels_get(sdi);

	if (pd_channel_maps) {
		g_hash_table_foreach(pd_channel_maps, &map_pd_inst_channels,
				     channels);
		g_hash_table_destroy(pd_channel_maps);
		pd_channel_maps = NULL;
	}
}

int setup_pd_annotations(char *opt_pd_annotations)
{
	GSList *l, *l_ann;
	struct srd_decoder *dec;
	int ann_class;
	char **pds, **pdtok, **keyval, **annlist, **ann, **ann_descr;
	const char *dec_id;
	const char *ann_txt;
	const char *ann_id;
	const struct srd_decoder_annotation_row *row_desc;
	char **ann_diag;

	/* Set up custom list of PDs and annotations to show. */
	pds = g_strsplit(opt_pd_annotations, ",", 0);
	for (pdtok = pds; *pdtok && **pdtok; pdtok++) {
		keyval = g_strsplit(*pdtok, "=", 0);
		dec_id = keyval[0];
		if (!(dec = srd_decoder_get_by_id(dec_id))) {
			g_critical("Protocol decoder '%s' not found.", dec_id);
			g_strfreev(keyval);
			g_strfreev(pds);
			return 1;
		}
		if (!dec->annotations) {
			g_critical("Protocol decoder '%s' has no annotations.", dec_id);
			g_strfreev(keyval);
			g_strfreev(pds);
			return 1;
		}
		ann_txt = (g_strv_length(keyval) == 2) ? keyval[1] : NULL;
		if (ann_txt && *ann_txt) {
			annlist = g_strsplit(ann_txt, ":", 0);
			for (ann = annlist; *ann && **ann; ann++) {
				ann_id = *ann;
				g_debug("cli: Lookup decoder %s annotation %s.", dec_id, ann_id);
				/* Lookup annotation class. */
				ann_class = 0;
				for (l = dec->annotations; l; l = l->next, ann_class++) {
					ann_descr = l->data;
					if (!canon_cmp(ann_descr[0], ann_id))
						/* Found it. */
						break;
				}
				if (l) {
					l_ann = g_hash_table_lookup(pd_ann_visible, dec_id);
					l_ann = g_slist_append(l_ann, GINT_TO_POINTER(ann_class));
					g_hash_table_replace(pd_ann_visible, g_strdup(dec_id), l_ann);
					g_debug("cli: Showing protocol decoder %s annotation "
							"class %d (%s).", dec_id, ann_class, ann_descr[0]);
					continue;
				}
				/* Lookup annotation row. */
				for (l = dec->annotation_rows; l; l = l->next) {
					row_desc = l->data;
					if (!canon_cmp(row_desc->id, ann_id))
						break;
				}
				if (l) {
					g_debug("cli: Showing decoder %s annotation row %s (%s).",
						dec_id, row_desc->id, row_desc->desc);
					l_ann = g_hash_table_lookup(pd_ann_visible, dec_id);
					for (l = row_desc->ann_classes; l; l = l->next) {
						/*
						 * This could just be:
						 *   l_ann = g_slist_append(l_ann, l->data);
						 * But we are explicit for readability
						 * and to access details for diagnostics.
						 */
						ann_class = GPOINTER_TO_INT(l->data);
						l_ann = g_slist_append(l_ann, GINT_TO_POINTER(ann_class));
						ann_diag = g_slist_nth_data(dec->annotations, ann_class);
						g_debug("cli: Adding class %d/%s from row %s.",
							ann_class, ann_diag[0], row_desc->id);
					}
					g_hash_table_replace(pd_ann_visible, g_strdup(dec_id), l_ann);
					continue;
				}
				/* No match found. */
				g_critical("Annotation '%s' not found "
						"for protocol decoder '%s'.", ann_id, dec_id);
				g_strfreev(keyval);
				g_strfreev(pds);
				return 1;
			}
		} else {
			/* No class specified: show all of them. */
			ann_class = -1;
			l_ann = g_slist_append(NULL, GINT_TO_POINTER(ann_class));
			g_hash_table_insert(pd_ann_visible, g_strdup(dec_id), l_ann);
			g_debug("cli: Showing all annotation classes for protocol "
					"decoder %s.", dec_id);
		}
		g_strfreev(keyval);
	}
	g_strfreev(pds);

	return 0;
}

int setup_pd_meta(char *opt_pd_meta)
{
	struct srd_decoder *dec;
	char **pds, **pdtok;

	pd_meta_visible = g_hash_table_new_full(g_str_hash, g_int_equal,
			g_free, NULL);
	pds = g_strsplit(opt_pd_meta, ",", 0);
	for (pdtok = pds; *pdtok && **pdtok; pdtok++) {
		if (!(dec = srd_decoder_get_by_id(*pdtok))) {
			g_critical("Protocol decoder '%s' not found.", *pdtok);
			return 1;
		}
		g_debug("cli: Showing protocol decoder meta output from '%s'.", *pdtok);
		g_hash_table_insert(pd_meta_visible, g_strdup(*pdtok), NULL);
	}
	g_strfreev(pds);

	return 0;
}

int setup_pd_binary(char *opt_pd_binary)
{
	GSList *l;
	struct srd_decoder *dec;
	int bin_class;
	char **pds, **pdtok, **keyval, **bin_name;

	pd_binary_visible = g_hash_table_new_full(g_str_hash, g_int_equal,
			g_free, NULL);
	pds = g_strsplit(opt_pd_binary, ",", 0);
	for (pdtok = pds; *pdtok && **pdtok; pdtok++) {
		keyval = g_strsplit(*pdtok, "=", 0);
		if (!(dec = srd_decoder_get_by_id(keyval[0]))) {
			g_critical("Protocol decoder '%s' not found.", keyval[0]);
			return 1;
		}
		if (!dec->binary) {
			g_critical("Protocol decoder '%s' has no binary output.", keyval[0]);
			return 1;
		}
		bin_class = 0;
		if (g_strv_length(keyval) == 2) {
			for (l = dec->binary; l; l = l->next, bin_class++) {
				bin_name = l->data;
				if (!strcmp(bin_name[0], keyval[1]))
					/* Found it. */
					break;
			}
			if (!l) {
				g_critical("binary output '%s' not found "
						"for protocol decoder '%s'.", keyval[1], keyval[0]);
				return 1;
			}
			g_debug("cli: Showing protocol decoder %s binary class "
					"%d (%s).", keyval[0], bin_class, bin_name[0]);
		} else {
			/* No class specified: output all of them. */
			bin_class = -1;
			g_debug("cli: Showing all binary classes for protocol "
					"decoder %s.", keyval[0]);
		}
		g_hash_table_insert(pd_binary_visible, g_strdup(keyval[0]), GINT_TO_POINTER(bin_class));
		g_strfreev(keyval);
	}
	g_strfreev(pds);

	return 0;
}

/*
 * Balance JSON object and array parentheses, and separate array items.
 * Somewhat convoluted API to re-use the routine for individual items as
 * well as the surrounding array and object, including deferred start of
 * the output and late flush (and to keep the state strictly local to the
 * routine). Some additional complexity due to JSON's inability to handle
 * a trailing comma at the last item. Code phrased such that text literals
 * are kept in their order of appearance in the output (where possible).
 */
static void jsontrace_open_close(gboolean is_close_req,
	gboolean open_item, gboolean close_item)
{
	static gboolean is_file_open;
	static gboolean is_item_open;

	if (is_close_req && is_item_open)
		close_item = TRUE;

	/* Automatic file header, and array item separation. */
	if (open_item) {
		if (!is_file_open)
			printf("{\"traceEvents\": [\n");
		if (is_item_open) {
			printf("}");
			is_item_open = FALSE;
		}
		if (is_file_open) {
			printf(",\n");
		}
		is_file_open = TRUE;
	}

	/* Array item open/append/close. */
	if (open_item) {
		printf("{");
		is_item_open = TRUE;
	}
	if (!open_item && !close_item && !is_close_req) {
		printf(", ");
		is_item_open = TRUE;
	}
	if (close_item) {
		printf("}");
		is_item_open = FALSE;
	}

	/* Automatic file footer on shutdown. */
	if (is_close_req && is_file_open) {
		printf("\n");
		printf("]}\n");
	}
	if (is_close_req)
		is_file_open = FALSE;

	/* Flush at end of lines, or end of file. */
	if (close_item || is_close_req)
		fflush(stdout);
}

/* Convert uint64 sample number to double timestamp in microseconds. */
static double jsontrace_ts_usec(uint64_t snum)
{
	double ts_usec;

	ts_usec = snum;
	ts_usec *= 1e6;
	ts_usec /= pd_samplerate;
	return ts_usec;
}

/* Emit two Google Trace Events (JSON) for one PD annotation (ss, es). */
static void jsontrace_annotation(struct srd_decoder *dec,
	struct srd_proto_data_annotation *pda, struct srd_proto_data *pdata)
{
	char *row_text;
	GSList *lrow, *lcls;
	struct srd_decoder_annotation_row *row;
	int cls;
	char **ann_descr;

	/*
	 * Search for an annotation row for this index, or use the
	 * annotation's descriptor.
	 */
	row_text = NULL;
	if (dec->annotation_rows) {
		for (lrow = dec->annotation_rows; lrow; lrow = lrow->next) {
			row = lrow->data;
			for (lcls = row->ann_classes; lcls; lcls = lcls->next) {
				cls = GPOINTER_TO_INT(lcls->data);
				if (cls == pda->ann_class) {
					row_text = row->desc;
					break;
				}
			}
			if (row_text)
				break;
		}
	}
	if (!row_text) {
		ann_descr = g_slist_nth_data(dec->annotations, pda->ann_class);
		row_text = ann_descr[0];
	}

	/*
	 * Emit two Google Trace Events for the start and end times.
	 * Set the 'pid' (process ID) to the decoder name to group a
	 * decoder's annotations. Set the 'tid' (thread ID) to the
	 * annotation row's description. The 'ts' (timestamp) is in
	 * microseconds. Set 'name' to the longest annotation text.
	 *
	 * BEWARE of the unfortunate JSON format limitation, which
	 * clutters data output calls with format helper calls.
	 * TODO Want to introduce a cJSON dependency to delegate the
	 * construction of output text?
	 */
	jsontrace_open_close(FALSE, TRUE, FALSE);
	printf("\"%s\": \"%s\"", "ph", "B");
	jsontrace_open_close(FALSE, FALSE, FALSE);
	printf("\"%s\": %lf", "ts", jsontrace_ts_usec(pdata->start_sample));
	jsontrace_open_close(FALSE, FALSE, FALSE);
	printf("\"%s\": \"%s\"", "pid", pdata->pdo->proto_id);
	jsontrace_open_close(FALSE, FALSE, FALSE);
	printf("\"%s\": \"%s\"", "tid", row_text);
	jsontrace_open_close(FALSE, FALSE, FALSE);
	printf("\"%s\": \"%s\"", "name", pda->ann_text[0]);

	jsontrace_open_close(FALSE, TRUE, FALSE);
	printf("\"%s\": \"%s\"", "ph", "E");
	jsontrace_open_close(FALSE, FALSE, FALSE);
	printf("\"%s\": %lf", "ts", jsontrace_ts_usec(pdata->end_sample));
	jsontrace_open_close(FALSE, FALSE, FALSE);
	printf("\"%s\": \"%s\"", "pid", pdata->pdo->proto_id);
	jsontrace_open_close(FALSE, FALSE, FALSE);
	printf("\"%s\": \"%s\"", "tid", row_text);
	jsontrace_open_close(FALSE, FALSE, FALSE);
	printf("\"%s\": \"%s\"", "name", pda->ann_text[0]);

	jsontrace_open_close(FALSE, FALSE, TRUE);
}

void show_pd_annotations(struct srd_proto_data *pdata, void *cb_data)
{
	struct srd_decoder *dec;
	struct srd_proto_data_annotation *pda;
	GSList *ann_list, *l;
	int i;
	char **ann_descr;
	gboolean show_ann, show_snum, show_class, show_quotes, show_abbrev;
	const char *quote;

	(void)cb_data;

	if (!pd_ann_visible)
		return;

	if (!g_hash_table_lookup_extended(pd_ann_visible, pdata->pdo->di->decoder->id,
			NULL, (void **)&ann_list)) {
		/* Not in the list of PDs whose annotations we're showing. */
		return;
	}

	dec = pdata->pdo->di->decoder;
	pda = pdata->data;
	show_ann = FALSE;
	for (l = ann_list; l; l = l->next) {
		if (GPOINTER_TO_INT(l->data) == -1
				|| GPOINTER_TO_INT(l->data) == pda->ann_class) {
			show_ann = TRUE;
			break;
		}
	}
	if (!show_ann)
		return;

	/* Google Trace Events are rather special. Use a separate code path. */
	if (opt_pd_jsontrace) {
		jsontrace_annotation(dec, pda, pdata);
		return;
	}

	/*
	 * Determine which fields of the annotation to display. Inspect
	 * user specified options as well as the verbosity of the log level:
	 * - Optionally show the sample numbers for the annotation's span.
	 * - Always show the protocol decoder ID.
	 * - Optionally show the annotation's class description.
	 * - Always show the longest annotation text.
	 * - Optionally show alternative annotation text (abbreviations
	 *   for different zoom levels).
	 * - Optionally put quote marks around annotation text, when
	 *   recipients might have to deal with a set of text variants.
	 */
	show_snum = show_class = show_quotes = show_abbrev = FALSE;
	if (opt_pd_samplenum || opt_loglevel > SR_LOG_WARN) {
		show_snum = TRUE;
	}
	if (opt_loglevel > SR_LOG_WARN) {
		show_quotes = TRUE;
	}
	if (opt_loglevel > SR_LOG_INFO) {
		show_class = TRUE;
		show_abbrev = TRUE;
	}
	if (opt_pd_ann_class)
		show_class = TRUE;

	/*
	 * Display the annotation's fields after the layout was
	 * determined above.
	 */
	if (show_snum) {
		printf("%" PRIu64 "-%" PRIu64 " ",
			pdata->start_sample, pdata->end_sample);
	}
	printf("%s: ", pdata->pdo->proto_id);
	if (show_class) {
		ann_descr = g_slist_nth_data(dec->annotations, pda->ann_class);
		printf("%s: ", ann_descr[0]);
	}
	quote = show_quotes ? "\"" : "";
	printf("%s%s%s", quote, pda->ann_text[0], quote);
	if (show_abbrev) {
		for (i = 1; pda->ann_text[i]; i++)
			printf(" %s%s%s", quote, pda->ann_text[i], quote);
	}
	printf("\n");
	fflush(stdout);
}

void show_pd_meta(struct srd_proto_data *pdata, void *cb_data)
{
	(void)cb_data;

	if (!g_hash_table_lookup_extended(pd_meta_visible,
			pdata->pdo->di->decoder->id, NULL, NULL))
		/* Not in the list of PDs whose meta output we're showing. */
		return;

	if (opt_pd_samplenum || opt_loglevel > SR_LOG_WARN)
		printf("%"PRIu64"-%"PRIu64" ", pdata->start_sample, pdata->end_sample);
	printf("%s: ", pdata->pdo->proto_id);
	printf("%s: %s", pdata->pdo->meta_name, g_variant_print(pdata->data, FALSE));
	printf("\n");
	fflush(stdout);
}

void show_pd_binary(struct srd_proto_data *pdata, void *cb_data)
{
	struct srd_proto_data_binary *pdb;
	gpointer classp;
	int classi;

	(void)cb_data;

	if (!g_hash_table_lookup_extended(pd_binary_visible,
			pdata->pdo->di->decoder->id, NULL, (void **)&classp))
		/* Not in the list of PDs whose meta output we're showing. */
		return;

	classi = GPOINTER_TO_INT(classp);
	pdb = pdata->data;
	if (classi != -1 && classi != pdb->bin_class)
		/* Not showing this binary class. */
		return;

	/* Just send the binary output to stdout, no embellishments. */
	fwrite(pdb->data, pdb->size, 1, stdout);
	fflush(stdout);
}

void show_pd_prepare(void)
{
	if (opt_pd_jsontrace)
		jsontrace_open_close(TRUE, FALSE, FALSE);
}

void show_pd_close(void)
{
	if (opt_pd_jsontrace)
		jsontrace_open_close(TRUE, FALSE, FALSE);
}
#endif