2 * This file is part of the libsigrok project.
4 * Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
5 * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
6 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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.
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.
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
26 #include "libsigrok.h"
27 #include "libsigrok-internal.h"
30 static const int hwcaps[] = {
32 SR_CONF_LIMIT_SAMPLES,
37 SR_PRIV struct sr_dev_driver alsa_driver_info;
38 static struct sr_dev_driver *di = &alsa_driver_info;
40 static int clear_instances(void)
42 struct drv_context *drvc;
44 if (!(drvc = di->priv))
47 g_slist_free_full(drvc->instances, (GDestroyNotify)alsa_dev_inst_clear);
48 drvc->instances = NULL;
53 static int hw_init(struct sr_context *sr_ctx)
55 return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
58 static GSList *hw_scan(GSList *options)
60 return alsa_scan(options, di);
63 static GSList *hw_dev_list(void)
65 return ((struct drv_context *)(di->priv))->instances;
68 static int hw_dev_open(struct sr_dev_inst *sdi)
70 struct dev_context *devc;
76 sr_err("devc->hwdev was NULL.");
80 sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
81 ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
82 SND_PCM_STREAM_CAPTURE, 0);
84 sr_err("Can't open audio device: %s.", snd_strerror(ret));
88 sr_dbg("Initializing hardware parameter structure.");
89 ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
91 sr_err("Can't initialize hardware parameter structure: %s.",
99 static int hw_dev_close(struct sr_dev_inst *sdi)
102 struct dev_context *devc;
106 if (devc->capture_handle) {
107 sr_dbg("Closing PCM device.");
108 if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
109 sr_err("Failed to close device: %s.",
111 devc->capture_handle = NULL;
114 sr_dbg("No capture handle, no need to close audio device.");
120 static int hw_cleanup(void)
127 static int config_get(int id, const void **data, const struct sr_dev_inst *sdi)
129 struct dev_context *devc;
132 case SR_CONF_SAMPLERATE:
134 *data = &devc->cur_samplerate;
143 static int config_set(int id, const void *value, const struct sr_dev_inst *sdi)
145 struct dev_context *devc;
150 case SR_CONF_SAMPLERATE:
151 alsa_set_samplerate(sdi, *(const uint64_t *)value);
153 case SR_CONF_LIMIT_SAMPLES:
154 devc->limit_samples = *(const uint64_t *)value;
157 sr_err("Unknown capability: %d.", id);
164 static int config_list(int key, const void **data, const struct sr_dev_inst *sdi)
166 struct dev_context *devc;
171 case SR_CONF_DEVICE_OPTIONS:
174 case SR_CONF_SAMPLERATE:
175 if (!sdi || !sdi->priv)
178 if (!devc->supp_rates.list) {
179 sr_err("Instance did not contain a samplerate list.");
182 *data = &devc->supp_rates;
191 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
194 struct sr_datafeed_packet packet;
195 struct sr_datafeed_header header;
196 struct dev_context *devc;
201 devc->cb_data = cb_data;
202 devc->num_samples = 0;
204 sr_dbg("Setting audio access type to RW/interleaved.");
205 ret = snd_pcm_hw_params_set_access(devc->capture_handle,
206 devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
208 sr_err("Can't set audio access type: %s.", snd_strerror(ret));
212 /* FIXME: Hardcoded for 16bits. */
213 if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
214 endianness = "little endian";
216 endianness = "big endian";
217 sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness);
218 ret = snd_pcm_hw_params_set_format(devc->capture_handle,
222 sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
226 sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
227 devc->cur_samplerate);
228 ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
229 (unsigned int)devc->cur_samplerate, 0);
231 sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
235 sr_dbg("Setting audio channel count to %d.", devc->num_probes);
236 ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
237 devc->hw_params, devc->num_probes);
239 sr_err("Can't set channel count: %s.", snd_strerror(ret));
243 sr_dbg("Setting audio parameters.");
244 ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
246 sr_err("Can't set parameters: %s.", snd_strerror(ret));
250 sr_dbg("Preparing audio interface for use.");
251 ret = snd_pcm_prepare(devc->capture_handle);
253 sr_err("Can't prepare audio interface for use: %s.",
258 count = snd_pcm_poll_descriptors_count(devc->capture_handle);
260 sr_err("Unable to obtain poll descriptors count.");
264 if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
265 sr_err("Failed to malloc ufds.");
266 return SR_ERR_MALLOC;
269 sr_spew("Getting %d poll descriptors.", count);
270 ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
272 sr_err("Unable to obtain poll descriptors: %s.",
278 /* Send header packet to the session bus. */
279 sr_dbg("Sending SR_DF_HEADER packet.");
280 packet.type = SR_DF_HEADER;
281 packet.payload = (uint8_t *)&header;
282 header.feed_version = 1;
283 gettimeofday(&header.starttime, NULL);
284 sr_session_send(devc->cb_data, &packet);
286 /* Poll every 10ms, or whenever some data comes in. */
287 sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
288 alsa_receive_data, (void *)sdi);
290 // g_free(devc->ufds); /* FIXME */
295 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
297 struct sr_datafeed_packet packet;
298 struct dev_context *devc;
301 devc->cb_data = cb_data;
303 sr_source_remove(devc->ufds[0].fd);
305 /* Send end packet to the session bus. */
306 sr_dbg("Sending SR_DF_END packet.");
307 packet.type = SR_DF_END;
308 sr_session_send(cb_data, &packet);
313 SR_PRIV struct sr_dev_driver alsa_driver_info = {
315 .longname = "ALSA driver",
318 .cleanup = hw_cleanup,
320 .dev_list = hw_dev_list,
321 .dev_clear = clear_instances,
322 .config_get = config_get,
323 .config_set = config_set,
324 .config_list = config_list,
325 .dev_open = hw_dev_open,
326 .dev_close = hw_dev_close,
327 .dev_acquisition_start = hw_dev_acquisition_start,
328 .dev_acquisition_stop = hw_dev_acquisition_stop,