[libsigrok.git] / src / output / wav.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2014 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 <string.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"

#define LOG_PREFIX "output/wav"

/* Minimum/maximum number of samples per channel to put in a data chunk */
#define MIN_DATA_CHUNK_SAMPLES 10

struct out_context {
	gboolean header_done;
	uint64_t samplerate;
	int num_channels;
	GSList *channels;
	int chanbuf_size;
	int *chanbuf_used;
	uint8_t **chanbuf;
};

static int realloc_chanbufs(const struct sr_output *o, int size)
{
	struct out_context *outc;
	int i;

	outc = o->priv;
	for (i = 0; i < outc->num_channels; i++) {
		if (!(outc->chanbuf[i] = g_try_realloc(outc->chanbuf[i], sizeof(float) * size))) { 
			sr_err("Unable to allocate enough output buffer memory.");
			return SR_ERR;
		}
		outc->chanbuf_used[i] = 0;
	}
	outc->chanbuf_size = size;

	return SR_OK;
}

static int flush_chanbufs(const struct sr_output *o, GString *out)
{
	struct out_context *outc;
	int num_samples, i, j;
	char *buf, *bufp;

	outc = o->priv;

	/* Any one of them will do. */
	num_samples = outc->chanbuf_used[0];
	if (!(buf = g_try_malloc(4 * num_samples * outc->num_channels))) {
		sr_err("Unable to allocate enough interleaved output buffer memory.");
		return SR_ERR;
	}

	bufp = buf;
	for (i = 0; i < num_samples; i++) {
		for (j = 0; j < outc->num_channels; j++) {
			memcpy(bufp, outc->chanbuf[j] + i * 4, 4);
			bufp += 4;
		}
	}
	g_string_append_len(out, buf, 4 * num_samples * outc->num_channels);
	g_free(buf);

	for (i = 0; i < outc->num_channels; i++)
		outc->chanbuf_used[i] = 0;

	return SR_OK;
}

static int init(struct sr_output *o, GHashTable *options)
{
	struct out_context *outc;
	struct sr_channel *ch;
	GSList *l;

	(void)options;

	outc = g_malloc0(sizeof(struct out_context));
	o->priv = outc;

	for (l = o->sdi->channels; l; l = l->next) {
		ch = l->data;
		if (ch->type != SR_CHANNEL_ANALOG)
			continue;
		if (!ch->enabled)
			continue;
		outc->channels = g_slist_append(outc->channels, ch);
		outc->num_channels++;
	}

	outc->chanbuf = g_malloc0(sizeof(float *) * outc->num_channels);
	outc->chanbuf_used = g_malloc0(sizeof(int) * outc->num_channels);

	/* Start off the interleaved buffer with 100 samples/channel. */
	realloc_chanbufs(o, 100);

	return SR_OK;
}

static void add_data_chunk(const struct sr_output *o, GString *gs)
{
	struct out_context *outc;
	char tmp[4];

	outc = o->priv;
	g_string_append(gs, "fmt ");
	/* Remaining chunk size */
	WL32(tmp, 0x12);
	g_string_append_len(gs, tmp, 4);
	/* Format code 3 = IEEE float */
	WL16(tmp, 0x0003);
	g_string_append_len(gs, tmp, 2);
	/* Number of channels */
	WL16(tmp, outc->num_channels);
	g_string_append_len(gs, tmp, 2);
	/* Samplerate */
	WL32(tmp, outc->samplerate);
	g_string_append_len(gs, tmp, 4);
	/* Byterate, using 32-bit floats. */
	WL32(tmp, outc->samplerate * outc->num_channels * 4);
	g_string_append_len(gs, tmp, 4);
	/* Blockalign */
	WL16(tmp, outc->num_channels * 4);
	g_string_append_len(gs, tmp, 2);
	/* Bits per sample */
	WL16(tmp, 32);
	g_string_append_len(gs, tmp, 2);
	WL16(tmp, 0);
	g_string_append_len(gs, tmp, 2);

	g_string_append(gs, "data");
	/* Data chunk size, max it out. */
	WL32(tmp, 0xffffffff);
	g_string_append_len(gs, tmp, 4);
}

static GString *gen_header(const struct sr_output *o)
{
	struct out_context *outc;
	GVariant *gvar;
	GString *header;
	char tmp[4];

	outc = o->priv;
	if (outc->samplerate == 0) {
		if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE,
				&gvar) == SR_OK) {
			outc->samplerate = g_variant_get_uint64(gvar);
			g_variant_unref(gvar);
		}
	}

	header = g_string_sized_new(512);
	g_string_append(header, "RIFF");
	/* Total size. Max out the field. */
	WL32(tmp, 0xffffffff);
	g_string_append_len(header, tmp, 4);
	g_string_append(header, "WAVE");
	add_data_chunk(o, header);

	return header;
}

/*
 * Stores the float in little-endian BINARY32 IEEE-754 2008 format.
 */
static void float_to_le(uint8_t *buf, float value)
{
	char *old;

	old = (char *)&value;
#ifdef WORDS_BIGENDIAN
	buf[0] = old[3];
	buf[1] = old[2];
	buf[2] = old[1];
	buf[3] = old[0];
#else
	buf[0] = old[0];
	buf[1] = old[1];
	buf[2] = old[2];
	buf[3] = old[3];
#endif
}

/*
 * Returns the number of samples used in the current channel buffers,
 * or -1 if they're not all the same.
 */
static int check_chanbuf_size(const struct sr_output *o)
{
	struct out_context *outc;
	int size, i;

	outc = o->priv;
	size = 0;
	for (i = 0; i < outc->num_channels; i++) {
		if (size == 0) {
			if (outc->chanbuf_used[i] == 0) {
				/* Nothing in all the buffers yet. */
				size = -1;
				break;
			} else
				/* New high water mark. */
				size = outc->chanbuf_used[i];
		} else if (outc->chanbuf_used[i] != size) {
			/* All channel buffers are not equally full yet. */
			size = -1;
			break;
		}
	}

	return size;
}
static int receive(const struct sr_output *o, const struct sr_datafeed_packet *packet,
		GString **out)
{
	struct out_context *outc;
	const struct sr_datafeed_meta *meta;
	const struct sr_datafeed_analog *analog;
	const struct sr_config *src;
	struct sr_channel *ch;
	GSList *l;
	int num_channels, size, *chan_idx, idx, i, j;
	uint8_t *buf;

	*out = NULL;
	if (!o || !o->sdi || !(outc = o->priv))
		return SR_ERR_ARG;

	switch (packet->type) {
	case SR_DF_META:
		meta = packet->payload;
		for (l = meta->config; l; l = l->next) {
			src = l->data;
			if (src->key != SR_CONF_SAMPLERATE)
				continue;
			outc->samplerate = g_variant_get_uint64(src->data);
		}
		break;
	case SR_DF_ANALOG:
		if (!outc->header_done) {
			*out = gen_header(o);
			outc->header_done = TRUE;
		} else
			*out = g_string_sized_new(512);

		analog = packet->payload;
		if (analog->num_samples == 0)
			return SR_OK;

		num_channels = g_slist_length(analog->channels);
		if (num_channels > outc->num_channels) {
			sr_err("Packet has %d channels, but only %d were enabled.",
					num_channels, outc->num_channels);
			return SR_ERR;
		}

		if (analog->num_samples > outc->chanbuf_size) {
			if (realloc_chanbufs(o, analog->num_samples) != SR_OK)
				return SR_ERR_MALLOC;
		}

		/* Index the channels in this packet, so we can interleave quicker. */
		chan_idx = g_malloc(sizeof(int) * outc->num_channels);
		for (i = 0; i < num_channels; i++) {
			ch = g_slist_nth_data(analog->channels, i);
			chan_idx[i] = g_slist_index(outc->channels, ch);
		}

		for (i = 0; i < analog->num_samples; i++) {
			for (j = 0; j < num_channels; j++) {
				idx = chan_idx[j];
				buf = outc->chanbuf[idx] + outc->chanbuf_used[idx]++ * 4;
				float_to_le(buf, analog->data[i * num_channels + j]);
			}
		}
		g_free(chan_idx);

		size = check_chanbuf_size(o);
		if (size > MIN_DATA_CHUNK_SAMPLES)
			if (flush_chanbufs(o, *out) != SR_OK)
				return SR_ERR;
		break;
	case SR_DF_END:
		size = check_chanbuf_size(o);
		if (size > 0) {
			*out = g_string_sized_new(4 * size * outc->num_channels);
			if (flush_chanbufs(o, *out) != SR_OK)
				return SR_ERR;
		}
		break;
	}

	return SR_OK;
}

static int cleanup(struct sr_output *o)
{
	struct out_context *outc;
	int i;

	outc = o->priv;
	g_slist_free(outc->channels);
	for (i = 0; i < outc->num_channels; i++)
		g_free(outc->chanbuf[i]);
	g_free(outc->chanbuf_used);
	g_free(outc->chanbuf);
	g_free(outc);
	o->priv = NULL;

	return SR_OK;
}

SR_PRIV struct sr_output_module output_wav = {
	.id = "wav",
	.name = "WAV",
	.desc = "WAVE file format",
	.init = init,
	.receive = receive,
	.cleanup = cleanup,
};
Commit	Line	Data
afaa75b9 BV	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2014 Bert Vermeulen <bert@biot.com>
	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 3 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, see <http://www.gnu.org/licenses/>.
	18	*/
	19
0605f874	20	#include <string.h>
afaa75b9 BV	21	#include "libsigrok.h"
	22	#include "libsigrok-internal.h"
	23
	24	#define LOG_PREFIX "output/wav"
	25
0605f874 BV	26	/* Minimum/maximum number of samples per channel to put in a data chunk */
	27	#define MIN_DATA_CHUNK_SAMPLES 10
	28
	29	struct out_context {
	30	gboolean header_done;
	31	uint64_t samplerate;
	32	int num_channels;
	33	GSList *channels;
	34	int chanbuf_size;
	35	int *chanbuf_used;
	36	uint8_t **chanbuf;
	37	};
	38
	39	static int realloc_chanbufs(const struct sr_output *o, int size)
	40	{
	41	struct out_context *outc;
	42	int i;
	43
	44	outc = o->priv;
	45	for (i = 0; i < outc->num_channels; i++) {
	46	if (!(outc->chanbuf[i] = g_try_realloc(outc->chanbuf[i], sizeof(float) * size))) {
	47	sr_err("Unable to allocate enough output buffer memory.");
	48	return SR_ERR;
	49	}
	50	outc->chanbuf_used[i] = 0;
	51	}
	52	outc->chanbuf_size = size;
	53
	54	return SR_OK;
	55	}
	56
	57	static int flush_chanbufs(const struct sr_output o, GString out)
	58	{
	59	struct out_context *outc;
364859ac BV	60	int num_samples, i, j;
364859ac BV	61	char buf, bufp;
0605f874 BV	62
	63	outc = o->priv;
	64
	65	/* Any one of them will do. */
364859ac BV	66	num_samples = outc->chanbuf_used[0];
364859ac BV	67	if (!(buf = g_try_malloc(4 * num_samples * outc->num_channels))) {
0605f874 BV	68	sr_err("Unable to allocate enough interleaved output buffer memory.");
	69	return SR_ERR;
	70	}
0605f874	71
364859ac BV	72	bufp = buf;
364859ac BV	73	for (i = 0; i < num_samples; i++) {
0605f874	74	for (j = 0; j < outc->num_channels; j++) {
364859ac BV	75	memcpy(bufp, outc->chanbuf[j] + i * 4, 4);
364859ac BV	76	bufp += 4;
0605f874 BV	77	}
0605f874 BV	78	}
364859ac	79	g_string_append_len(out, buf, 4 * num_samples * outc->num_channels);
0605f874 BV	80	g_free(buf);
	81
	82	for (i = 0; i < outc->num_channels; i++)
	83	outc->chanbuf_used[i] = 0;
	84
	85	return SR_OK;
	86	}
	87
afaa75b9 BV	88	static int init(struct sr_output o, GHashTable options)
afaa75b9 BV	89	{
0605f874 BV	90	struct out_context *outc;
	91	struct sr_channel *ch;
	92	GSList *l;
	93
afaa75b9 BV	94	(void)options;
afaa75b9 BV	95
0605f874 BV	96	outc = g_malloc0(sizeof(struct out_context));
	97	o->priv = outc;
	98
	99	for (l = o->sdi->channels; l; l = l->next) {
	100	ch = l->data;
	101	if (ch->type != SR_CHANNEL_ANALOG)
	102	continue;
	103	if (!ch->enabled)
	104	continue;
	105	outc->channels = g_slist_append(outc->channels, ch);
	106	outc->num_channels++;
	107	}
	108
	109	outc->chanbuf = g_malloc0(sizeof(float ) outc->num_channels);
	110	outc->chanbuf_used = g_malloc0(sizeof(int) * outc->num_channels);
	111
	112	/* Start off the interleaved buffer with 100 samples/channel. */
	113	realloc_chanbufs(o, 100);
	114
afaa75b9 BV	115	return SR_OK;
	116	}
	117
0605f874 BV	118	static void add_data_chunk(const struct sr_output o, GString gs)
	119	{
	120	struct out_context *outc;
	121	char tmp[4];
	122
	123	outc = o->priv;
	124	g_string_append(gs, "fmt ");
	125	/* Remaining chunk size */
	126	WL32(tmp, 0x12);
	127	g_string_append_len(gs, tmp, 4);
	128	/* Format code 3 = IEEE float */
	129	WL16(tmp, 0x0003);
	130	g_string_append_len(gs, tmp, 2);
	131	/* Number of channels */
	132	WL16(tmp, outc->num_channels);
	133	g_string_append_len(gs, tmp, 2);
	134	/* Samplerate */
	135	WL32(tmp, outc->samplerate);
	136	g_string_append_len(gs, tmp, 4);
	137	/* Byterate, using 32-bit floats. */
	138	WL32(tmp, outc->samplerate * outc->num_channels * 4);
	139	g_string_append_len(gs, tmp, 4);
	140	/* Blockalign */
	141	WL16(tmp, outc->num_channels * 4);
	142	g_string_append_len(gs, tmp, 2);
	143	/* Bits per sample */
	144	WL16(tmp, 32);
	145	g_string_append_len(gs, tmp, 2);
	146	WL16(tmp, 0);
	147	g_string_append_len(gs, tmp, 2);
	148
	149	g_string_append(gs, "data");
	150	/* Data chunk size, max it out. */
	151	WL32(tmp, 0xffffffff);
	152	g_string_append_len(gs, tmp, 4);
	153	}
	154
	155	static GString gen_header(const struct sr_output o)
	156	{
	157	struct out_context *outc;
	158	GVariant *gvar;
	159	GString *header;
	160	char tmp[4];
	161
	162	outc = o->priv;
	163	if (outc->samplerate == 0) {
	164	if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE,
	165	&gvar) == SR_OK) {
	166	outc->samplerate = g_variant_get_uint64(gvar);
	167	g_variant_unref(gvar);
	168	}
	169	}
	170
	171	header = g_string_sized_new(512);
	172	g_string_append(header, "RIFF");
	173	/* Total size. Max out the field. */
	174	WL32(tmp, 0xffffffff);
	175	g_string_append_len(header, tmp, 4);
	176	g_string_append(header, "WAVE");
	177	add_data_chunk(o, header);
	178
	179	return header;
	180	}
	181
182	/*
183	* Stores the float in little-endian BINARY32 IEEE-754 2008 format.
184	*/
185	static void float_to_le(uint8_t *buf, float value)
186	{
187	char *old;
188
189	old = (char *)&value;
190	#ifdef WORDS_BIGENDIAN
191	buf[0] = old[3];
192	buf[1] = old[2];
193	buf[2] = old[1];
194	buf[3] = old[0];
195	#else
196	buf[0] = old[0];
197	buf[1] = old[1];
198	buf[2] = old[2];
199	buf[3] = old[3];
200	#endif
201	}
202
203	/*
204	* Returns the number of samples used in the current channel buffers,
205	* or -1 if they're not all the same.
206	*/
207	static int check_chanbuf_size(const struct sr_output *o)
208	{
209	struct out_context *outc;
210	int size, i;
211
212	outc = o->priv;
213	size = 0;
214	for (i = 0; i < outc->num_channels; i++) {
215	if (size == 0) {
216	if (outc->chanbuf_used[i] == 0) {
217	/* Nothing in all the buffers yet. */
218	size = -1;
219	break;
220	} else
221	/* New high water mark. */
222	size = outc->chanbuf_used[i];
223	} else if (outc->chanbuf_used[i] != size) {
224	/* All channel buffers are not equally full yet. */
225	size = -1;
226	break;
227	}
228	}
229
230	return size;
231	}
afaa75b9 BV	232	static int receive(const struct sr_output o, const struct sr_datafeed_packet packet,
	233	GString **out)
	234	{
0605f874 BV	235	struct out_context *outc;
	236	const struct sr_datafeed_meta *meta;
	237	const struct sr_datafeed_analog *analog;
	238	const struct sr_config *src;
	239	struct sr_channel *ch;
	240	GSList *l;
	241	int num_channels, size, *chan_idx, idx, i, j;
	242	uint8_t *buf;
	243
	244	*out = NULL;
	245	if (!o \|\| !o->sdi \|\| !(outc = o->priv))
	246	return SR_ERR_ARG;
	247
	248	switch (packet->type) {
	249	case SR_DF_META:
	250	meta = packet->payload;
	251	for (l = meta->config; l; l = l->next) {
	252	src = l->data;
	253	if (src->key != SR_CONF_SAMPLERATE)
	254	continue;
	255	outc->samplerate = g_variant_get_uint64(src->data);
	256	}
	257	break;
	258	case SR_DF_ANALOG:
	259	if (!outc->header_done) {
	260	*out = gen_header(o);
	261	outc->header_done = TRUE;
	262	} else
	263	*out = g_string_sized_new(512);
	264
	265	analog = packet->payload;
	266	if (analog->num_samples == 0)
	267	return SR_OK;
	268
	269	num_channels = g_slist_length(analog->channels);
	270	if (num_channels > outc->num_channels) {
	271	sr_err("Packet has %d channels, but only %d were enabled.",
	272	num_channels, outc->num_channels);
	273	return SR_ERR;
	274	}
	275
	276	if (analog->num_samples > outc->chanbuf_size) {
	277	if (realloc_chanbufs(o, analog->num_samples) != SR_OK)
	278	return SR_ERR_MALLOC;
	279	}
	280
	281	/* Index the channels in this packet, so we can interleave quicker. */
	282	chan_idx = g_malloc(sizeof(int) * outc->num_channels);
	283	for (i = 0; i < num_channels; i++) {
	284	ch = g_slist_nth_data(analog->channels, i);
	285	chan_idx[i] = g_slist_index(outc->channels, ch);
	286	}
	287
	288	for (i = 0; i < analog->num_samples; i++) {
	289	for (j = 0; j < num_channels; j++) {
	290	idx = chan_idx[j];
	291	buf = outc->chanbuf[idx] + outc->chanbuf_used[idx]++ * 4;
364859ac	292	float_to_le(buf, analog->data[i * num_channels + j]);
0605f874 BV	293	}
	294	}
	295	g_free(chan_idx);
	296
	297	size = check_chanbuf_size(o);
	298	if (size > MIN_DATA_CHUNK_SAMPLES)
	299	if (flush_chanbufs(o, *out) != SR_OK)
	300	return SR_ERR;
	301	break;
	302	case SR_DF_END:
	303	size = check_chanbuf_size(o);
	304	if (size > 0) {
	305	out = g_string_sized_new(4 size * outc->num_channels);
	306	if (flush_chanbufs(o, *out) != SR_OK)
	307	return SR_ERR;
	308	}
	309	break;
	310	}
afaa75b9 BV	311
	312	return SR_OK;
	313	}
	314
	315	static int cleanup(struct sr_output *o)
	316	{
0605f874 BV	317	struct out_context *outc;
	318	int i;
	319
	320	outc = o->priv;
	321	g_slist_free(outc->channels);
	322	for (i = 0; i < outc->num_channels; i++)
	323	g_free(outc->chanbuf[i]);
	324	g_free(outc->chanbuf_used);
	325	g_free(outc->chanbuf);
	326	g_free(outc);
	327	o->priv = NULL;
afaa75b9 BV	328
	329	return SR_OK;
	330	}
	331
	332	SR_PRIV struct sr_output_module output_wav = {
	333	.id = "wav",
	334	.name = "WAV",
0605f874	335	.desc = "WAVE file format",
afaa75b9 BV	336	.init = init,
	337	.receive = receive,
	338	.cleanup = cleanup,
	339	};
	340