[libsigrok.git] / hardware / alsa / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
 * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.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 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 <unistd.h>
#include <string.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"

static const int32_t hwcaps[] = {
	SR_CONF_SAMPLERATE,
	SR_CONF_LIMIT_SAMPLES,
	SR_CONF_CONTINUOUS,
};

SR_PRIV struct sr_dev_driver alsa_driver_info;
static struct sr_dev_driver *di = &alsa_driver_info;

static void clear_helper(void *priv)
{
	struct dev_context *devc;

	devc = priv;

	snd_pcm_hw_params_free(devc->hw_params);
	devc->hw_params = NULL;

	g_free((void *)devc->samplerates);
	devc->samplerates = NULL;
}

static int dev_clear(void)
{
	return std_dev_clear(di, clear_helper);
}

static int init(struct sr_context *sr_ctx)
{
	return std_init(sr_ctx, di, LOG_PREFIX);
}

static GSList *scan(GSList *options)
{
	return alsa_scan(options, di);
}

static GSList *dev_list(void)
{
	return ((struct drv_context *)(di->priv))->instances;
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int ret;

	devc = sdi->priv;

	if (!(devc->hwdev)) {
		sr_err("devc->hwdev was NULL.");
		return SR_ERR_BUG;
	}

	sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
	ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
			   SND_PCM_STREAM_CAPTURE, 0);
	if (ret < 0) {
		sr_err("Can't open audio device: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	sr_dbg("Initializing hardware parameter structure.");
	ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
	if (ret < 0) {
		sr_err("Can't initialize hardware parameter structure: %s.",
		       snd_strerror(ret));
		return SR_ERR;
	}

	sdi->status = SR_ST_ACTIVE;

	return SR_OK;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	int ret;
	struct dev_context *devc;

	devc = sdi->priv;

	if (devc->capture_handle) {
		sr_dbg("Closing PCM device.");
		if ((ret = snd_pcm_close(devc->capture_handle)) < 0)
			sr_err("Failed to close device: %s.",
			       snd_strerror(ret));
		devc->capture_handle = NULL;
		sdi->status = SR_ST_INACTIVE;
	} else {
		sr_dbg("No capture handle, no need to close audio device.");
	}

	return SR_OK;
}

static int cleanup(void)
{
	return dev_clear();
}

static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc;

	(void)cg;

	switch (id) {
	case SR_CONF_SAMPLERATE:
		devc = sdi->priv;
		*data = g_variant_new_uint64(devc->cur_samplerate);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc;

	(void)cg;

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	devc = sdi->priv;

	switch (id) {
	case SR_CONF_SAMPLERATE:
		alsa_set_samplerate(sdi, g_variant_get_uint64(data));
		break;
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc;
	GVariant *gvar;
	GVariantBuilder gvb;
	int i;

	(void)cg;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
		break;
	case SR_CONF_SAMPLERATE:
		if (!sdi || !sdi->priv)
			return SR_ERR_ARG;
		devc = sdi->priv;
		if (!devc->samplerates) {
			sr_err("Instance did not contain a samplerate list.");
			return SR_ERR_ARG;
		}
		for (i = 0; devc->samplerates[i]; i++)
			;
		g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
		gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
				devc->samplerates, i, sizeof(uint64_t));
		g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
		*data = g_variant_builder_end(&gvb);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
{
	struct dev_context *devc;
	int count, ret;
	char *endianness;

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	devc = sdi->priv;
	devc->cb_data = cb_data;
	devc->num_samples = 0;

	sr_dbg("Setting audio access type to RW/interleaved.");
	ret = snd_pcm_hw_params_set_access(devc->capture_handle,
			devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
	if (ret < 0) {
		sr_err("Can't set audio access type: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	/* FIXME: Hardcoded for 16bits. */
	if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
		endianness = "little endian";
	else
		endianness = "big endian";
	sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness);
	ret = snd_pcm_hw_params_set_format(devc->capture_handle,
					   devc->hw_params,
					   SND_PCM_FORMAT_S16);
	if (ret < 0) {
		sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
	       devc->cur_samplerate);
	ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
					 (unsigned int)devc->cur_samplerate, 0);
	if (ret < 0) {
		sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	sr_dbg("Setting audio channel count to %d.", devc->num_channels);
	ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
					     devc->hw_params, devc->num_channels);
	if (ret < 0) {
		sr_err("Can't set channel count: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	sr_dbg("Setting audio parameters.");
	ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
	if (ret < 0) {
		sr_err("Can't set parameters: %s.", snd_strerror(ret));
		return SR_ERR;
	}

	sr_dbg("Preparing audio interface for use.");
	ret = snd_pcm_prepare(devc->capture_handle);
	if (ret < 0) {
		sr_err("Can't prepare audio interface for use: %s.",
		       snd_strerror(ret));
		return SR_ERR;
	}

	count = snd_pcm_poll_descriptors_count(devc->capture_handle);
	if (count < 1) {
		sr_err("Unable to obtain poll descriptors count.");
		return SR_ERR;
	}

	if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
		sr_err("Failed to malloc ufds.");
		return SR_ERR_MALLOC;
	}

	sr_spew("Getting %d poll descriptors.", count);
	ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
	if (ret < 0) {
		sr_err("Unable to obtain poll descriptors: %s.",
		       snd_strerror(ret));
		g_free(devc->ufds);
		return SR_ERR;
	}

	/* Send header packet to the session bus. */
	std_session_send_df_header(cb_data, LOG_PREFIX);

	/* Poll every 10ms, or whenever some data comes in. */
	sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
		      alsa_receive_data, (void *)sdi);

	// g_free(devc->ufds); /* FIXME */

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct dev_context *devc;

	devc = sdi->priv;
	devc->cb_data = cb_data;

	sr_source_remove(devc->ufds[0].fd);

	/* Send end packet to the session bus. */
	sr_dbg("Sending SR_DF_END packet.");
	packet.type = SR_DF_END;
	sr_session_send(cb_data, &packet);

	return SR_OK;
}

SR_PRIV struct sr_dev_driver alsa_driver_info = {
	.name = "alsa",
	.longname = "ALSA driver",
	.api_version = 1,
	.init = init,
	.cleanup = cleanup,
	.scan = scan,
	.dev_list = dev_list,
	.dev_clear = dev_clear,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = dev_open,
	.dev_close = dev_close,
	.dev_acquisition_start = dev_acquisition_start,
	.dev_acquisition_stop = dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
6ed4f044	1	/*
6944b2d0	2	* This file is part of the libsigrok project.
6ed4f044 DR	3	*
6ed4f044 DR	4	* Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
0254651d	5	* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
6944b2d0	6	* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
6ed4f044 DR	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
9cd9f6b7 AG	23	#include <stdlib.h>
	24	#include <unistd.h>
	25	#include <string.h>
721ecf3d UH	26	#include "libsigrok.h"
	27	#include "libsigrok-internal.h"
	28	#include "protocol.h"
472bbb46	29
aa0dbd68	30	static const int32_t hwcaps[] = {
1953564a BV	31	SR_CONF_SAMPLERATE,
	32	SR_CONF_LIMIT_SAMPLES,
	33	SR_CONF_CONTINUOUS,
6ed4f044 DR	34	};
6ed4f044 DR	35
0254651d UH	36	SR_PRIV struct sr_dev_driver alsa_driver_info;
0254651d UH	37	static struct sr_dev_driver *di = &alsa_driver_info;
6ed4f044	38
c43cf4d4	39	static void clear_helper(void *priv)
0254651d	40	{
c43cf4d4	41	struct dev_context *devc;
6944b2d0	42
c43cf4d4	43	devc = priv;
6944b2d0	44
c43cf4d4	45	snd_pcm_hw_params_free(devc->hw_params);
e11a1eba UH	46	devc->hw_params = NULL;
e11a1eba UH	47
c43cf4d4	48	g_free((void *)devc->samplerates);
e11a1eba	49	devc->samplerates = NULL;
c43cf4d4	50	}
0254651d	51
3b412e3a	52	static int dev_clear(void)
c43cf4d4 UH	53	{
c43cf4d4 UH	54	return std_dev_clear(di, clear_helper);
0254651d UH	55	}
0254651d UH	56
6078d2c9	57	static int init(struct sr_context *sr_ctx)
6ed4f044	58	{
f6beaac5	59	return std_init(sr_ctx, di, LOG_PREFIX);
0254651d UH	60	}
0254651d UH	61
6078d2c9	62	static GSList scan(GSList options)
0254651d	63	{
6944b2d0	64	return alsa_scan(options, di);
6ed4f044 DR	65	}
6ed4f044 DR	66
6078d2c9	67	static GSList *dev_list(void)
6ed4f044	68	{
0e94d524	69	return ((struct drv_context *)(di->priv))->instances;
0254651d UH	70	}
0254651d UH	71
6078d2c9	72	static int dev_open(struct sr_dev_inst *sdi)
0254651d UH	73	{
0254651d UH	74	struct dev_context *devc;
ebc34738	75	int ret;
6ed4f044	76
0254651d	77	devc = sdi->priv;
6ed4f044	78
6944b2d0 AG	79	if (!(devc->hwdev)) {
	80	sr_err("devc->hwdev was NULL.");
	81	return SR_ERR_BUG;
	82	}
	83
	84	sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
	85	ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
ea9cfed7	86	SND_PCM_STREAM_CAPTURE, 0);
ebc34738	87	if (ret < 0) {
0254651d	88	sr_err("Can't open audio device: %s.", snd_strerror(ret));
e46b8fb1	89	return SR_ERR;
6ed4f044 DR	90	}
6ed4f044 DR	91
0254651d UH	92	sr_dbg("Initializing hardware parameter structure.");
0254651d UH	93	ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
ebc34738	94	if (ret < 0) {
0254651d	95	sr_err("Can't initialize hardware parameter structure: %s.",
472bbb46	96	snd_strerror(ret));
e46b8fb1	97	return SR_ERR;
6ed4f044 DR	98	}
6ed4f044 DR	99
e73ffd42 BV	100	sdi->status = SR_ST_ACTIVE;
e73ffd42 BV	101
e46b8fb1	102	return SR_OK;
6ed4f044 DR	103	}
6ed4f044 DR	104
6078d2c9	105	static int dev_close(struct sr_dev_inst *sdi)
6ed4f044	106	{
0254651d UH	107	int ret;
0254651d UH	108	struct dev_context *devc;
6ed4f044	109
0254651d UH	110	devc = sdi->priv;
0254651d UH	111
0254651d UH	112	if (devc->capture_handle) {
0254651d UH	113	sr_dbg("Closing PCM device.");
e11a1eba	114	if ((ret = snd_pcm_close(devc->capture_handle)) < 0)
0254651d UH	115	sr_err("Failed to close device: %s.",
0254651d UH	116	snd_strerror(ret));
e11a1eba UH	117	devc->capture_handle = NULL;
e11a1eba UH	118	sdi->status = SR_ST_INACTIVE;
0254651d UH	119	} else {
	120	sr_dbg("No capture handle, no need to close audio device.");
	121	}
697785d1 UH	122
697785d1 UH	123	return SR_OK;
6ed4f044 DR	124	}
6ed4f044 DR	125
6078d2c9	126	static int cleanup(void)
6ed4f044	127	{
3b412e3a	128	return dev_clear();
6ed4f044 DR	129	}
6ed4f044 DR	130
8f996b89	131	static int config_get(int id, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	132	const struct sr_channel_group *cg)
6ed4f044	133	{
0254651d	134	struct dev_context *devc;
6ed4f044	135
53b4680f	136	(void)cg;
8f996b89	137
035a1078	138	switch (id) {
123e1313	139	case SR_CONF_SAMPLERATE:
9a6517d1	140	devc = sdi->priv;
aa0dbd68	141	*data = g_variant_new_uint64(devc->cur_samplerate);
6ed4f044	142	break;
0254651d	143	default:
bd6fbf62	144	return SR_ERR_NA;
6ed4f044 DR	145	}
6ed4f044 DR	146
0254651d	147	return SR_OK;
6ed4f044 DR	148	}
6ed4f044 DR	149
8f996b89	150	static int config_set(int id, GVariant data, const struct sr_dev_inst sdi,
53b4680f	151	const struct sr_channel_group *cg)
6ed4f044	152	{
0254651d	153	struct dev_context *devc;
6ed4f044	154
53b4680f	155	(void)cg;
8f996b89	156
e73ffd42 BV	157	if (sdi->status != SR_ST_ACTIVE)
	158	return SR_ERR_DEV_CLOSED;
	159
0254651d	160	devc = sdi->priv;
6ed4f044	161
035a1078	162	switch (id) {
1953564a	163	case SR_CONF_SAMPLERATE:
aa0dbd68	164	alsa_set_samplerate(sdi, g_variant_get_uint64(data));
0254651d	165	break;
1953564a	166	case SR_CONF_LIMIT_SAMPLES:
aa0dbd68	167	devc->limit_samples = g_variant_get_uint64(data);
0254651d	168	break;
6ed4f044	169	default:
bd6fbf62	170	return SR_ERR_NA;
6ed4f044	171	}
0254651d UH	172
0254651d UH	173	return SR_OK;
6ed4f044 DR	174	}
6ed4f044 DR	175
8f996b89	176	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	177	const struct sr_channel_group *cg)
a1c743fc BV	178	{
a1c743fc BV	179	struct dev_context *devc;
aa0dbd68 BV	180	GVariant *gvar;
	181	GVariantBuilder gvb;
	182	int i;
a1c743fc	183
53b4680f	184	(void)cg;
8f996b89	185
a1c743fc	186	switch (key) {
9a6517d1	187	case SR_CONF_DEVICE_OPTIONS:
aa0dbd68 BV	188	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
aa0dbd68 BV	189	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
9a6517d1	190	break;
a1c743fc BV	191	case SR_CONF_SAMPLERATE:
	192	if (!sdi \|\| !sdi->priv)
	193	return SR_ERR_ARG;
	194	devc = sdi->priv;
aa0dbd68	195	if (!devc->samplerates) {
a1c743fc BV	196	sr_err("Instance did not contain a samplerate list.");
	197	return SR_ERR_ARG;
	198	}
aa0dbd68 BV	199	for (i = 0; devc->samplerates[i]; i++)
	200	;
	201	g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
	202	gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
	203	devc->samplerates, i, sizeof(uint64_t));
	204	g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
	205	*data = g_variant_builder_end(&gvb);
a1c743fc BV	206	break;
a1c743fc BV	207	default:
bd6fbf62	208	return SR_ERR_NA;
a1c743fc BV	209	}
	210
	211	return SR_OK;
	212	}
	213
6078d2c9	214	static int dev_acquisition_start(const struct sr_dev_inst sdi, void cb_data)
6ed4f044	215	{
0254651d UH	216	struct dev_context *devc;
0254651d UH	217	int count, ret;
721ecf3d	218	char *endianness;
6ed4f044	219
e73ffd42 BV	220	if (sdi->status != SR_ST_ACTIVE)
	221	return SR_ERR_DEV_CLOSED;
	222
0254651d UH	223	devc = sdi->priv;
0254651d UH	224	devc->cb_data = cb_data;
729850c9	225	devc->num_samples = 0;
6ed4f044	226
0254651d UH	227	sr_dbg("Setting audio access type to RW/interleaved.");
	228	ret = snd_pcm_hw_params_set_access(devc->capture_handle,
	229	devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
ebc34738	230	if (ret < 0) {
0254651d	231	sr_err("Can't set audio access type: %s.", snd_strerror(ret));
e46b8fb1	232	return SR_ERR;
6ed4f044 DR	233	}
6ed4f044 DR	234
0254651d	235	/* FIXME: Hardcoded for 16bits. */
729850c9	236	if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
721ecf3d	237	endianness = "little endian";
729850c9	238	else
721ecf3d UH	239	endianness = "big endian";
721ecf3d UH	240	sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness);
0254651d	241	ret = snd_pcm_hw_params_set_format(devc->capture_handle,
729850c9 AG	242	devc->hw_params,
729850c9 AG	243	SND_PCM_FORMAT_S16);
ebc34738	244	if (ret < 0) {
0254651d	245	sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
e46b8fb1	246	return SR_ERR;
6ed4f044 DR	247	}
6ed4f044 DR	248
0254651d UH	249	sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
0254651d UH	250	devc->cur_samplerate);
0d6ff103 AG	251	ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
0d6ff103 AG	252	(unsigned int)devc->cur_samplerate, 0);
ebc34738	253	if (ret < 0) {
0254651d	254	sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
e46b8fb1	255	return SR_ERR;
6ed4f044 DR	256	}
6ed4f044 DR	257
ba7dd8bb	258	sr_dbg("Setting audio channel count to %d.", devc->num_channels);
0254651d	259	ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
ba7dd8bb	260	devc->hw_params, devc->num_channels);
ebc34738	261	if (ret < 0) {
0254651d	262	sr_err("Can't set channel count: %s.", snd_strerror(ret));
e46b8fb1	263	return SR_ERR;
6ed4f044 DR	264	}
6ed4f044 DR	265
0254651d UH	266	sr_dbg("Setting audio parameters.");
0254651d UH	267	ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
ebc34738	268	if (ret < 0) {
0254651d	269	sr_err("Can't set parameters: %s.", snd_strerror(ret));
e46b8fb1	270	return SR_ERR;
6ed4f044 DR	271	}
6ed4f044 DR	272
0254651d UH	273	sr_dbg("Preparing audio interface for use.");
0254651d UH	274	ret = snd_pcm_prepare(devc->capture_handle);
ebc34738	275	if (ret < 0) {
0254651d	276	sr_err("Can't prepare audio interface for use: %s.",
ebc34738	277	snd_strerror(ret));
e46b8fb1	278	return SR_ERR;
6ed4f044 DR	279	}
6ed4f044 DR	280
0254651d	281	count = snd_pcm_poll_descriptors_count(devc->capture_handle);
6ed4f044	282	if (count < 1) {
472bbb46	283	sr_err("Unable to obtain poll descriptors count.");
e46b8fb1	284	return SR_ERR;
6ed4f044 DR	285	}
6ed4f044 DR	286
0254651d UH	287	if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
0254651d UH	288	sr_err("Failed to malloc ufds.");
e46b8fb1	289	return SR_ERR_MALLOC;
92b3101c	290	}
6ed4f044	291
3d6de074	292	sr_spew("Getting %d poll descriptors.", count);
0254651d	293	ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
ebc34738	294	if (ret < 0) {
0254651d	295	sr_err("Unable to obtain poll descriptors: %s.",
ebc34738	296	snd_strerror(ret));
0254651d	297	g_free(devc->ufds);
e46b8fb1	298	return SR_ERR;
6ed4f044 DR	299	}
6ed4f044 DR	300
0254651d	301	/* Send header packet to the session bus. */
29a27196	302	std_session_send_df_header(cb_data, LOG_PREFIX);
0254651d	303
0254651d UH	304	/* Poll every 10ms, or whenever some data comes in. */
0254651d UH	305	sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
9cd9f6b7	306	alsa_receive_data, (void *)sdi);
0254651d UH	307
0254651d UH	308	// g_free(devc->ufds); /* FIXME */
6ed4f044	309
e46b8fb1	310	return SR_OK;
6ed4f044 DR	311	}
6ed4f044 DR	312
6078d2c9	313	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
6ed4f044	314	{
0254651d UH	315	struct sr_datafeed_packet packet;
	316	struct dev_context *devc;
	317
	318	devc = sdi->priv;
	319	devc->cb_data = cb_data;
	320
	321	sr_source_remove(devc->ufds[0].fd);
	322
	323	/* Send end packet to the session bus. */
	324	sr_dbg("Sending SR_DF_END packet.");
	325	packet.type = SR_DF_END;
	326	sr_session_send(cb_data, &packet);
3010f21c UH	327
3010f21c UH	328	return SR_OK;
6ed4f044 DR	329	}
6ed4f044 DR	330
c09f0b57	331	SR_PRIV struct sr_dev_driver alsa_driver_info = {
e519ba86 UH	332	.name = "alsa",
	333	.longname = "ALSA driver",
	334	.api_version = 1,
6078d2c9 UH	335	.init = init,
	336	.cleanup = cleanup,
	337	.scan = scan,
	338	.dev_list = dev_list,
3b412e3a	339	.dev_clear = dev_clear,
035a1078 BV	340	.config_get = config_get,
035a1078 BV	341	.config_set = config_set,
a1c743fc	342	.config_list = config_list,
6078d2c9 UH	343	.dev_open = dev_open,
	344	.dev_close = dev_close,
	345	.dev_acquisition_start = dev_acquisition_start,
	346	.dev_acquisition_stop = dev_acquisition_stop,
0254651d	347	.priv = NULL,
6ed4f044	348	};