[libsigrok.git] / output / output_gnuplot.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <sigrok.h>
#include <sigrok-internal.h>
#include "config.h"

struct context {
	unsigned int num_enabled_probes;
	unsigned int unitsize;
	char *probelist[SR_MAX_NUM_PROBES + 1];
	char *header;
};

#define MAX_HEADER_LEN \
	(1024 + (SR_MAX_NUM_PROBES * (SR_MAX_PROBENAME_LEN + 10)))

static const char *gnuplot_header = "\
# Sample data in space-separated columns format usable by gnuplot\n\
#\n\
# Generated by: %s on %s%s\
# Period: %s\n\
#\n\
# Column\tProbe\n\
# -------------------------------------\
----------------------------------------\n\
# 0\t\tSample counter (for internal gnuplot purposes)\n%s\n";

static const char *gnuplot_header_comment = "\
# Comment: Acquisition with %d/%d probes at %s\n";

static int init(struct sr_output *o)
{
	struct context *ctx;
	struct sr_probe *probe;
	GSList *l;
	uint64_t samplerate;
	unsigned int i;
	int b, num_probes;
	char *c, *frequency_s;
	char wbuf[1000], comment[128];
	time_t t;

	if (!o) {
		sr_warn("gnuplot out: %s: o was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!o->device) {
		sr_warn("gnuplot out: %s: o->device was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!o->device->plugin) {
		sr_warn("gnuplot out: %s: o->device->plugin was NULL",
			__func__);
		return SR_ERR_ARG;
	}

	if (!(ctx = calloc(1, sizeof(struct context)))) {
		sr_warn("gnuplot out: %s: ctx calloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	if (!(ctx->header = calloc(1, MAX_HEADER_LEN + 1))) {
		sr_warn("gnuplot out: %s: ctx->header calloc failed",
			__func__);
		free(ctx);
		return SR_ERR_MALLOC;
	}

	o->internal = ctx;
	ctx->num_enabled_probes = 0;
	for (l = o->device->probes; l; l = l->next) {
		probe = l->data; /* TODO: Error checks. */
		if (!probe->enabled)
			continue;
		ctx->probelist[ctx->num_enabled_probes++] = probe->name;
	}
	ctx->probelist[ctx->num_enabled_probes] = 0;
	ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;

	num_probes = g_slist_length(o->device->probes);
	comment[0] = '\0';
	if (sr_device_has_hwcap(o->device, SR_HWCAP_SAMPLERATE)) {
		samplerate = *((uint64_t *) o->device->plugin->get_device_info(
				o->device->plugin_index, SR_DI_CUR_SAMPLERATE));
		if (!(frequency_s = sr_samplerate_string(samplerate))) {
			sr_warn("gnuplot out: %s: sr_samplerate_string failed",
				__func__);
			free(ctx->header);
			free(ctx);
			return SR_ERR;
		}
		snprintf(comment, 127, gnuplot_header_comment,
			ctx->num_enabled_probes, num_probes, frequency_s);
		free(frequency_s);
	}

	/* Columns / channels */
	wbuf[0] = '\0';
	for (i = 0; i < ctx->num_enabled_probes; i++) {
		c = (char *)&wbuf + strlen((char *)&wbuf);
		sprintf(c, "# %d\t\t%s\n", i + 1, ctx->probelist[i]);
	}

	if (!(frequency_s = sr_period_string(samplerate))) {
		sr_warn("gnuplot out: %s: sr_period_string failed", __func__);
		free(ctx->header);
		free(ctx);
		return SR_ERR;
	}

	t = time(NULL);
	b = snprintf(ctx->header, MAX_HEADER_LEN, gnuplot_header,
		     PACKAGE_STRING, ctime(&t), comment, frequency_s,
		     (char *)&wbuf);
	free(frequency_s);

	if (b < 0) {
		sr_warn("gnuplot out: %s: sprintf failed", __func__);
		free(ctx->header);
		free(ctx);
		return SR_ERR;
	}

	return 0;
}

static int event(struct sr_output *o, int event_type, char **data_out,
		 uint64_t *length_out)
{
	struct context *ctx;

	if (!o) {
		sr_warn("gnuplot out: %s: o was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!data_out) {
		sr_warn("gnuplot out: %s: data_out was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!length_out) {
		sr_warn("gnuplot out: %s: length_out was NULL", __func__);
		return SR_ERR_ARG;
	}

	ctx = o->internal;

	switch (event_type) {
	case SR_DF_TRIGGER:
		/* TODO: Can a trigger mark be in a gnuplot data file? */
		break;
	case SR_DF_END:
		free(o->internal);
		o->internal = NULL;
		break;
	default:
		sr_warn("gnuplot out: %s: unsupported event type: %d",
			__func__, event_type);
		break;
	}

	*data_out = NULL;
	*length_out = 0;

	return SR_OK;
}

static int data(struct sr_output *o, const char *data_in, uint64_t length_in,
		char **data_out, uint64_t *length_out)
{
	struct context *ctx;
	unsigned int max_linelen, outsize, p, curbit, i;
	uint64_t sample;
	static uint64_t samplecount = 0, old_sample = 0;
	char *outbuf, *c;

	if (!o) {
		sr_warn("gnuplot out: %s: o was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!o->internal) {
		sr_warn("gnuplot out: %s: o->internal was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!data_in) {
		sr_warn("gnuplot out: %s: data_in was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!data_out) {
		sr_warn("gnuplot out: %s: data_out was NULL", __func__);
		return SR_ERR_ARG;
	}

	if (!length_out) {
		sr_warn("gnuplot out: %s: length_out was NULL", __func__);
		return SR_ERR_ARG;
	}

	ctx = o->internal;
	max_linelen = 16 + ctx->num_enabled_probes * 2;
	outsize = length_in / ctx->unitsize * max_linelen;
	if (ctx->header)
		outsize += strlen(ctx->header);

	if (!(outbuf = calloc(1, outsize))) {
		sr_warn("gnuplot out: %s: outbuf calloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	outbuf[0] = '\0';
	if (ctx->header) {
		/* The header is still here, this must be the first packet. */
		strncpy(outbuf, ctx->header, outsize);
		free(ctx->header);
		ctx->header = NULL;
	}

	for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {

		memcpy(&sample, data_in + i, ctx->unitsize);

		/*
		 * Don't output the same samples multiple times. However, make
		 * sure to output at least the first and last sample.
		 */
		if (samplecount++ != 0 && sample == old_sample) {
			if (i != (length_in - ctx->unitsize))
				continue;
		}
		old_sample = sample;

		/* The first column is a counter (needed for gnuplot). */
		c = outbuf + strlen(outbuf);
		sprintf(c, "%" PRIu64 "\t", samplecount++);

		/* The next columns are the values of all channels. */
		for (p = 0; p < ctx->num_enabled_probes; p++) {
			curbit = (sample & ((uint64_t) (1 << p))) >> p;
			c = outbuf + strlen(outbuf);
			sprintf(c, "%d ", curbit);
		}

		c = outbuf + strlen(outbuf);
		sprintf(c, "\n");
	}

	*data_out = outbuf;
	*length_out = strlen(outbuf);

	return SR_OK;
}

struct sr_output_format output_gnuplot = {
	.id = "gnuplot",
	.description = "Gnuplot",
	.df_type = SR_DF_LOGIC,
	.init = init,
	.data = data,
	.event = event,
};

/* Temporarily disabled. */
#if 0
static int analog_init(struct sr_output *o)
{
	struct context *ctx;
	struct sr_probe *probe;
	GSList *l;
	uint64_t samplerate;
	unsigned int i;
	int b, num_probes;
	char *c, *frequency_s;
	char wbuf[1000], comment[128];
	time_t t;

	if (!(ctx = calloc(1, sizeof(struct context))))
		return SR_ERR_MALLOC;

	if (!(ctx->header = calloc(1, MAX_HEADER_LEN + 1))) {
		free(ctx);
		return SR_ERR_MALLOC;
	}

	o->internal = ctx;
	ctx->num_enabled_probes = 0;
	for (l = o->device->probes; l; l = l->next) {
		probe = l->data;
		if (!probe->enabled)
			continue;
		ctx->probelist[ctx->num_enabled_probes++] = probe->name;
	}
	ctx->probelist[ctx->num_enabled_probes] = 0;
//	ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
	ctx->unitsize = sizeof(struct sr_analog_sample) +
			(ctx->num_enabled_probes * sizeof(struct sr_analog_probe));

	num_probes = g_slist_length(o->device->probes);
	comment[0] = '\0';
	if (o->device->plugin && sr_device_has_hwcap(o->device, SR_HWCAP_SAMPLERATE)) {
		samplerate = *((uint64_t *) o->device->plugin->get_device_info(
				o->device->plugin_index, SR_DI_CUR_SAMPLERATE));
		if (!(frequency_s = sr_samplerate_string(samplerate))) {
			free(ctx->header);
			free(ctx);
			return SR_ERR;
		}
		snprintf(comment, 127, gnuplot_header_comment,
			ctx->num_enabled_probes, num_probes, frequency_s);
		free(frequency_s);
	}

	/* Columns / channels */
	wbuf[0] = '\0';
	for (i = 0; i < ctx->num_enabled_probes; i++) {
		c = (char *)&wbuf + strlen((char *)&wbuf);
		sprintf(c, "# %d\t\t%s\n", i + 1, ctx->probelist[i]);
	}

	if (!(frequency_s = sr_period_string(samplerate))) {
		free(ctx->header);
		free(ctx);
		return SR_ERR;
	}
	t = time(NULL);
	b = snprintf(ctx->header, MAX_HEADER_LEN, gnuplot_header,
		     PACKAGE_STRING, ctime(&t), comment, frequency_s,
		     (char *)&wbuf);
	free(frequency_s);

	if (b < 0) {
		free(ctx->header);
		free(ctx);
		return SR_ERR;
	}

	return 0;
}

static int analog_data(struct sr_output *o, char *data_in, uint64_t length_in,
		char **data_out, uint64_t *length_out)
{
	struct context *ctx;
	unsigned int max_linelen, outsize, p, /* curbit, */ i;
//	uint64_t sample;
	static uint64_t samplecount = 0;
	char *outbuf, *c;
	struct sr_analog_sample *sample;

	ctx = o->internal;
//	max_linelen = 16 + ctx->num_enabled_probes * 2;
	max_linelen = 16 + ctx->num_enabled_probes * 30;
	outsize = length_in / ctx->unitsize * max_linelen;
	if (ctx->header)
		outsize += strlen(ctx->header);

	if (!(outbuf = calloc(1, outsize)))
		return SR_ERR_MALLOC;

	outbuf[0] = '\0';
	if (ctx->header) {
		/* The header is still here, this must be the first packet. */
		strncpy(outbuf, ctx->header, outsize);
		free(ctx->header);
		ctx->header = NULL;
	}

	for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
//		memcpy(&sample, data_in + i, ctx->unitsize);
		sample = (struct sr_analog_sample *) (data_in + i);

		/* The first column is a counter (needed for gnuplot). */
		c = outbuf + strlen(outbuf);
		sprintf(c, "%" PRIu64 "\t", samplecount++);

		/* The next columns are the values of all channels. */
		for (p = 0; p < ctx->num_enabled_probes; p++) {
//			curbit = (sample & ((uint64_t) (1 << p))) >> p;
			c = outbuf + strlen(outbuf);
//			sprintf(c, "%d ", curbit);
			/*
			 * FIXME: Should be doing proper raw->voltage conversion
			 * here, casting to int16_t isn't it. Remember that if
			 * res = 1 conversion isn't necessary.
			 */
			sprintf(c, "%f ", (double) ((int16_t) (sample->probes[p].val &
					((1 << sample->probes[p].res) - 1))));
		}

		c = outbuf + strlen(outbuf);
		sprintf(c, "\n");
	}

	*data_out = outbuf;
	*length_out = strlen(outbuf);

	return SR_OK;
}

struct sr_output_format output_analog_gnuplot = {
	.id = "analog_gnuplot",
	.description = "Gnuplot analog",
	.df_type = SR_DF_ANALOG,
	.init = analog_init,
	.data = analog_data,
	.event = event,
};
#endif
Commit	Line	Data
	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include <stdlib.h>
	22	#include <string.h>
	23	#include <glib.h>
	24	#include <sigrok.h>
	25	#include <sigrok-internal.h>
	26	#include "config.h"
	27
	28	struct context {
	29	unsigned int num_enabled_probes;
	30	unsigned int unitsize;
	31	char *probelist[SR_MAX_NUM_PROBES + 1];
	32	char *header;
	33	};
	34
	35	#define MAX_HEADER_LEN \
	36	(1024 + (SR_MAX_NUM_PROBES * (SR_MAX_PROBENAME_LEN + 10)))
	37
	38	static const char *gnuplot_header = "\
	39	# Sample data in space-separated columns format usable by gnuplot\n\
	40	#\n\
	41	# Generated by: %s on %s%s\
	42	# Period: %s\n\
	43	#\n\
	44	# Column\tProbe\n\
	45	# -------------------------------------\
	46	----------------------------------------\n\
	47	# 0\t\tSample counter (for internal gnuplot purposes)\n%s\n";
	48
	49	static const char *gnuplot_header_comment = "\
	50	# Comment: Acquisition with %d/%d probes at %s\n";
	51
	52	static int init(struct sr_output *o)
	53	{
	54	struct context *ctx;
	55	struct sr_probe *probe;
	56	GSList *l;
	57	uint64_t samplerate;
	58	unsigned int i;
	59	int b, num_probes;
	60	char c, frequency_s;
	61	char wbuf[1000], comment[128];
	62	time_t t;
	63
	64	if (!o) {
	65	sr_warn("gnuplot out: %s: o was NULL", __func__);
	66	return SR_ERR_ARG;
	67	}
	68
	69	if (!o->device) {
	70	sr_warn("gnuplot out: %s: o->device was NULL", __func__);
	71	return SR_ERR_ARG;
	72	}
	73
	74	if (!o->device->plugin) {
	75	sr_warn("gnuplot out: %s: o->device->plugin was NULL",
	76	__func__);
	77	return SR_ERR_ARG;
	78	}
	79
	80	if (!(ctx = calloc(1, sizeof(struct context)))) {
	81	sr_warn("gnuplot out: %s: ctx calloc failed", __func__);
	82	return SR_ERR_MALLOC;
	83	}
	84
	85	if (!(ctx->header = calloc(1, MAX_HEADER_LEN + 1))) {
	86	sr_warn("gnuplot out: %s: ctx->header calloc failed",
	87	__func__);
	88	free(ctx);
	89	return SR_ERR_MALLOC;
	90	}
	91
	92	o->internal = ctx;
	93	ctx->num_enabled_probes = 0;
	94	for (l = o->device->probes; l; l = l->next) {
	95	probe = l->data; /* TODO: Error checks. */
	96	if (!probe->enabled)
	97	continue;
	98	ctx->probelist[ctx->num_enabled_probes++] = probe->name;
	99	}
	100	ctx->probelist[ctx->num_enabled_probes] = 0;
	101	ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
	102
	103	num_probes = g_slist_length(o->device->probes);
	104	comment[0] = '\0';
	105	if (sr_device_has_hwcap(o->device, SR_HWCAP_SAMPLERATE)) {
	106	samplerate = ((uint64_t ) o->device->plugin->get_device_info(
	107	o->device->plugin_index, SR_DI_CUR_SAMPLERATE));
	108	if (!(frequency_s = sr_samplerate_string(samplerate))) {
	109	sr_warn("gnuplot out: %s: sr_samplerate_string failed",
	110	__func__);
	111	free(ctx->header);
	112	free(ctx);
	113	return SR_ERR;
	114	}
	115	snprintf(comment, 127, gnuplot_header_comment,
	116	ctx->num_enabled_probes, num_probes, frequency_s);
	117	free(frequency_s);
	118	}
	119
	120	/* Columns / channels */
	121	wbuf[0] = '\0';
	122	for (i = 0; i < ctx->num_enabled_probes; i++) {
	123	c = (char )&wbuf + strlen((char )&wbuf);
	124	sprintf(c, "# %d\t\t%s\n", i + 1, ctx->probelist[i]);
	125	}
	126
	127	if (!(frequency_s = sr_period_string(samplerate))) {
	128	sr_warn("gnuplot out: %s: sr_period_string failed", __func__);
	129	free(ctx->header);
	130	free(ctx);
	131	return SR_ERR;
	132	}
	133
	134	t = time(NULL);
	135	b = snprintf(ctx->header, MAX_HEADER_LEN, gnuplot_header,
	136	PACKAGE_STRING, ctime(&t), comment, frequency_s,
	137	(char *)&wbuf);
	138	free(frequency_s);
	139
	140	if (b < 0) {
	141	sr_warn("gnuplot out: %s: sprintf failed", __func__);
	142	free(ctx->header);
	143	free(ctx);
	144	return SR_ERR;
	145	}
	146
	147	return 0;
	148	}
	149
	150	static int event(struct sr_output o, int event_type, char *data_out,
	151	uint64_t *length_out)
	152	{
	153	struct context *ctx;
	154
	155	if (!o) {
	156	sr_warn("gnuplot out: %s: o was NULL", __func__);
	157	return SR_ERR_ARG;
	158	}
	159
	160	if (!data_out) {
	161	sr_warn("gnuplot out: %s: data_out was NULL", __func__);
	162	return SR_ERR_ARG;
	163	}
	164
	165	if (!length_out) {
	166	sr_warn("gnuplot out: %s: length_out was NULL", __func__);
	167	return SR_ERR_ARG;
	168	}
	169
	170	ctx = o->internal;
	171
	172	switch (event_type) {
	173	case SR_DF_TRIGGER:
	174	/* TODO: Can a trigger mark be in a gnuplot data file? */
	175	break;
	176	case SR_DF_END:
	177	free(o->internal);
	178	o->internal = NULL;
	179	break;
	180	default:
	181	sr_warn("gnuplot out: %s: unsupported event type: %d",
	182	__func__, event_type);
	183	break;
	184	}
	185
	186	*data_out = NULL;
	187	*length_out = 0;
	188
	189	return SR_OK;
	190	}
	191
	192	static int data(struct sr_output o, const char data_in, uint64_t length_in,
	193	char *data_out, uint64_t length_out)
	194	{
	195	struct context *ctx;
	196	unsigned int max_linelen, outsize, p, curbit, i;
	197	uint64_t sample;
	198	static uint64_t samplecount = 0, old_sample = 0;
	199	char outbuf, c;
	200
	201	if (!o) {
	202	sr_warn("gnuplot out: %s: o was NULL", __func__);
	203	return SR_ERR_ARG;
	204	}
	205
	206	if (!o->internal) {
	207	sr_warn("gnuplot out: %s: o->internal was NULL", __func__);
	208	return SR_ERR_ARG;
	209	}
	210
	211	if (!data_in) {
	212	sr_warn("gnuplot out: %s: data_in was NULL", __func__);
	213	return SR_ERR_ARG;
	214	}
	215
	216	if (!data_out) {
	217	sr_warn("gnuplot out: %s: data_out was NULL", __func__);
	218	return SR_ERR_ARG;
	219	}
	220
	221	if (!length_out) {
	222	sr_warn("gnuplot out: %s: length_out was NULL", __func__);
	223	return SR_ERR_ARG;
	224	}
	225
	226	ctx = o->internal;
	227	max_linelen = 16 + ctx->num_enabled_probes * 2;
	228	outsize = length_in / ctx->unitsize * max_linelen;
	229	if (ctx->header)
	230	outsize += strlen(ctx->header);
	231
	232	if (!(outbuf = calloc(1, outsize))) {
	233	sr_warn("gnuplot out: %s: outbuf calloc failed", __func__);
	234	return SR_ERR_MALLOC;
	235	}
	236
	237	outbuf[0] = '\0';
	238	if (ctx->header) {
	239	/* The header is still here, this must be the first packet. */
	240	strncpy(outbuf, ctx->header, outsize);
	241	free(ctx->header);
	242	ctx->header = NULL;
	243	}
	244
	245	for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
	246
	247	memcpy(&sample, data_in + i, ctx->unitsize);
	248
	249	/*
	250	* Don't output the same samples multiple times. However, make
	251	* sure to output at least the first and last sample.
	252	*/
	253	if (samplecount++ != 0 && sample == old_sample) {
	254	if (i != (length_in - ctx->unitsize))
	255	continue;
	256	}
	257	old_sample = sample;
	258
	259	/* The first column is a counter (needed for gnuplot). */
	260	c = outbuf + strlen(outbuf);
	261	sprintf(c, "%" PRIu64 "\t", samplecount++);
	262
	263	/* The next columns are the values of all channels. */
	264	for (p = 0; p < ctx->num_enabled_probes; p++) {
	265	curbit = (sample & ((uint64_t) (1 << p))) >> p;
	266	c = outbuf + strlen(outbuf);
	267	sprintf(c, "%d ", curbit);
	268	}
	269
	270	c = outbuf + strlen(outbuf);
	271	sprintf(c, "\n");
	272	}
	273
	274	*data_out = outbuf;
	275	*length_out = strlen(outbuf);
	276
	277	return SR_OK;
	278	}
	279
	280	struct sr_output_format output_gnuplot = {
	281	.id = "gnuplot",
	282	.description = "Gnuplot",
	283	.df_type = SR_DF_LOGIC,
	284	.init = init,
	285	.data = data,
	286	.event = event,
	287	};
	288
	289	/* Temporarily disabled. */
	290	#if 0
	291	static int analog_init(struct sr_output *o)
	292	{
	293	struct context *ctx;
	294	struct sr_probe *probe;
	295	GSList *l;
	296	uint64_t samplerate;
	297	unsigned int i;
	298	int b, num_probes;
	299	char c, frequency_s;
	300	char wbuf[1000], comment[128];
	301	time_t t;
	302
	303	if (!(ctx = calloc(1, sizeof(struct context))))
	304	return SR_ERR_MALLOC;
	305
	306	if (!(ctx->header = calloc(1, MAX_HEADER_LEN + 1))) {
	307	free(ctx);
	308	return SR_ERR_MALLOC;
	309	}
	310
	311	o->internal = ctx;
	312	ctx->num_enabled_probes = 0;
	313	for (l = o->device->probes; l; l = l->next) {
	314	probe = l->data;
	315	if (!probe->enabled)
	316	continue;
	317	ctx->probelist[ctx->num_enabled_probes++] = probe->name;
	318	}
	319	ctx->probelist[ctx->num_enabled_probes] = 0;
	320	// ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
	321	ctx->unitsize = sizeof(struct sr_analog_sample) +
	322	(ctx->num_enabled_probes * sizeof(struct sr_analog_probe));
	323
	324	num_probes = g_slist_length(o->device->probes);
	325	comment[0] = '\0';
	326	if (o->device->plugin && sr_device_has_hwcap(o->device, SR_HWCAP_SAMPLERATE)) {
	327	samplerate = ((uint64_t ) o->device->plugin->get_device_info(
	328	o->device->plugin_index, SR_DI_CUR_SAMPLERATE));
	329	if (!(frequency_s = sr_samplerate_string(samplerate))) {
	330	free(ctx->header);
	331	free(ctx);
	332	return SR_ERR;
	333	}
	334	snprintf(comment, 127, gnuplot_header_comment,
	335	ctx->num_enabled_probes, num_probes, frequency_s);
	336	free(frequency_s);
	337	}
	338
	339	/* Columns / channels */
	340	wbuf[0] = '\0';
	341	for (i = 0; i < ctx->num_enabled_probes; i++) {
	342	c = (char )&wbuf + strlen((char )&wbuf);
	343	sprintf(c, "# %d\t\t%s\n", i + 1, ctx->probelist[i]);
	344	}
	345
	346	if (!(frequency_s = sr_period_string(samplerate))) {
	347	free(ctx->header);
	348	free(ctx);
	349	return SR_ERR;
	350	}
	351	t = time(NULL);
	352	b = snprintf(ctx->header, MAX_HEADER_LEN, gnuplot_header,
	353	PACKAGE_STRING, ctime(&t), comment, frequency_s,
	354	(char *)&wbuf);
	355	free(frequency_s);
	356
	357	if (b < 0) {
	358	free(ctx->header);
	359	free(ctx);
	360	return SR_ERR;
	361	}
	362
	363	return 0;
	364	}
	365
	366	static int analog_data(struct sr_output o, char data_in, uint64_t length_in,
	367	char *data_out, uint64_t length_out)
	368	{
	369	struct context *ctx;
	370	unsigned int max_linelen, outsize, p, /* curbit, */ i;
	371	// uint64_t sample;
	372	static uint64_t samplecount = 0;
	373	char outbuf, c;
	374	struct sr_analog_sample *sample;
	375
	376	ctx = o->internal;
	377	// max_linelen = 16 + ctx->num_enabled_probes * 2;
	378	max_linelen = 16 + ctx->num_enabled_probes * 30;
	379	outsize = length_in / ctx->unitsize * max_linelen;
	380	if (ctx->header)
	381	outsize += strlen(ctx->header);
	382
	383	if (!(outbuf = calloc(1, outsize)))
	384	return SR_ERR_MALLOC;
	385
	386	outbuf[0] = '\0';
	387	if (ctx->header) {
	388	/* The header is still here, this must be the first packet. */
	389	strncpy(outbuf, ctx->header, outsize);
	390	free(ctx->header);
	391	ctx->header = NULL;
	392	}
	393
	394	for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
	395	// memcpy(&sample, data_in + i, ctx->unitsize);
	396	sample = (struct sr_analog_sample *) (data_in + i);
	397
	398	/* The first column is a counter (needed for gnuplot). */
	399	c = outbuf + strlen(outbuf);
	400	sprintf(c, "%" PRIu64 "\t", samplecount++);
	401
	402	/* The next columns are the values of all channels. */
	403	for (p = 0; p < ctx->num_enabled_probes; p++) {
	404	// curbit = (sample & ((uint64_t) (1 << p))) >> p;
	405	c = outbuf + strlen(outbuf);
	406	// sprintf(c, "%d ", curbit);
	407	/*
	408	* FIXME: Should be doing proper raw->voltage conversion
	409	* here, casting to int16_t isn't it. Remember that if
	410	* res = 1 conversion isn't necessary.
	411	*/
	412	sprintf(c, "%f ", (double) ((int16_t) (sample->probes[p].val &
	413	((1 << sample->probes[p].res) - 1))));
	414	}
	415
	416	c = outbuf + strlen(outbuf);
	417	sprintf(c, "\n");
	418	}
	419
	420	*data_out = outbuf;
	421	*length_out = strlen(outbuf);
	422
	423	return SR_OK;
	424	}
	425
	426	struct sr_output_format output_analog_gnuplot = {
	427	.id = "analog_gnuplot",
	428	.description = "Gnuplot analog",
	429	.df_type = SR_DF_ANALOG,
	430	.init = analog_init,
	431	.data = analog_data,
	432	.event = event,
	433	};
	434	#endif