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
24 #include "libsigrok.h"
25 #include "libsigrok-internal.h"
31 static const int hwcaps[] = {
33 SR_HWCAP_LIMIT_SAMPLES,
38 static const char *probe_names[] = {
39 "Channel 0", "Channel 1",
43 SR_PRIV struct sr_dev_driver alsa_driver_info;
44 static struct sr_dev_driver *di = &alsa_driver_info;
46 static int clear_instances(void)
48 struct drv_context *drvc;
50 if (!(drvc = di->priv))
53 g_slist_free_full(drvc->instances, (GDestroyNotify)alsa_dev_inst_clear);
54 drvc->instances = NULL;
59 static int hw_init(struct sr_context *sr_ctx)
61 struct drv_context *drvc;
63 if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
64 sr_err("Driver context malloc failed.");
68 drvc->sr_ctx = sr_ctx;
74 static GSList *hw_scan(GSList *options)
76 return alsa_scan(options, di);
79 static GSList *hw_dev_list(void)
81 struct drv_context *drvc;
85 return drvc->instances;
88 static int hw_dev_open(struct sr_dev_inst *sdi)
90 struct dev_context *devc;
96 sr_err("devc->hwdev was NULL.");
100 sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
101 ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
102 SND_PCM_STREAM_CAPTURE, 0);
104 sr_err("Can't open audio device: %s.", snd_strerror(ret));
108 sr_dbg("Initializing hardware parameter structure.");
109 ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
111 sr_err("Can't initialize hardware parameter structure: %s.",
119 static int hw_dev_close(struct sr_dev_inst *sdi)
122 struct dev_context *devc;
126 sr_dbg("Closing device.");
128 if (devc->capture_handle) {
129 sr_dbg("Closing PCM device.");
130 if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
131 sr_err("Failed to close device: %s.",
133 devc->capture_handle = NULL;
136 sr_dbg("No capture handle, no need to close audio device.");
142 static int hw_cleanup(void)
149 static int hw_info_get(int info_id, const void **data,
150 const struct sr_dev_inst *sdi)
152 struct dev_context *devc;
154 if (info_id != SR_DI_HWCAPS) /* For SR_DI_HWCAPS sdi will be NULL. */
161 case SR_DI_NUM_PROBES:
162 *data = &devc->num_probes;
164 case SR_DI_PROBE_NAMES:
167 case SR_DI_CUR_SAMPLERATE:
168 *data = &devc->cur_samplerate;
170 case SR_DI_SAMPLERATES:
171 if (!devc->supp_rates.list) {
172 sr_err("Instance did not contain a samplerate list");
175 *data = &devc->supp_rates;
178 sr_err("Invalid info_id: %d.", info_id);
185 static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
188 struct dev_context *devc;
193 case SR_HWCAP_SAMPLERATE:
194 alsa_set_samplerate(sdi, *(const uint64_t *)value);
196 case SR_HWCAP_LIMIT_SAMPLES:
197 devc->limit_samples = *(const uint64_t *)value;
200 sr_err("Unknown capability: %d.", hwcap);
207 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
210 struct sr_datafeed_packet packet;
211 struct sr_datafeed_header header;
212 struct sr_datafeed_meta_analog meta;
213 struct dev_context *devc;
218 devc->cb_data = cb_data;
219 devc->num_samples = 0;
221 sr_dbg("Setting audio access type to RW/interleaved.");
222 ret = snd_pcm_hw_params_set_access(devc->capture_handle,
223 devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
225 sr_err("Can't set audio access type: %s.", snd_strerror(ret));
229 /* FIXME: Hardcoded for 16bits. */
230 if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
231 endianess = "lilltle endian";
233 endianess = "big endian";
234 sr_dbg("Setting audio sample format to signed 16bit (%s).", endianess);
235 ret = snd_pcm_hw_params_set_format(devc->capture_handle,
239 sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
243 sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
244 devc->cur_samplerate);
245 ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
246 (unsigned int)devc->cur_samplerate, 0);
248 sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
252 sr_dbg("Setting audio channel count to %d.", devc->num_probes);
253 ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
254 devc->hw_params, devc->num_probes);
256 sr_err("Can't set channel count: %s.", snd_strerror(ret));
260 sr_dbg("Setting audio parameters.");
261 ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
263 sr_err("Can't set parameters: %s.", snd_strerror(ret));
267 sr_dbg("Preparing audio interface for use.");
268 ret = snd_pcm_prepare(devc->capture_handle);
270 sr_err("Can't prepare audio interface for use: %s.",
275 count = snd_pcm_poll_descriptors_count(devc->capture_handle);
277 sr_err("Unable to obtain poll descriptors count.");
280 sr_spew("Obtained poll descriptor count: %d.", count);
282 if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
283 sr_err("Failed to malloc ufds.");
284 return SR_ERR_MALLOC;
287 sr_err("Getting %d poll descriptors.", count);
288 ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
290 sr_err("Unable to obtain poll descriptors: %s.",
296 /* Send header packet to the session bus. */
297 sr_dbg("Sending SR_DF_HEADER packet.");
298 packet.type = SR_DF_HEADER;
299 packet.payload = (uint8_t *)&header;
300 header.feed_version = 1;
301 gettimeofday(&header.starttime, NULL);
302 sr_session_send(devc->cb_data, &packet);
304 /* Send metadata about the SR_DF_ANALOG packets to come. */
305 sr_dbg("Sending SR_DF_META_ANALOG packet.");
306 packet.type = SR_DF_META_ANALOG;
307 packet.payload = &meta;
308 meta.num_probes = devc->num_probes;
309 sr_session_send(devc->cb_data, &packet);
311 /* Poll every 10ms, or whenever some data comes in. */
312 sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
313 alsa_receive_data, (void *)sdi);
315 // g_free(devc->ufds); /* FIXME */
320 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
322 struct sr_datafeed_packet packet;
323 struct dev_context *devc;
326 devc->cb_data = cb_data;
328 sr_source_remove(devc->ufds[0].fd);
330 /* Send end packet to the session bus. */
331 sr_dbg("Sending SR_DF_END packet.");
332 packet.type = SR_DF_END;
333 sr_session_send(cb_data, &packet);
338 SR_PRIV struct sr_dev_driver alsa_driver_info = {
340 .longname = "ALSA driver",
343 .cleanup = hw_cleanup,
345 .dev_list = hw_dev_list,
346 .dev_clear = clear_instances,
347 .dev_open = hw_dev_open,
348 .dev_close = hw_dev_close,
349 .info_get = hw_info_get,
350 .dev_config_set = hw_dev_config_set,
351 .dev_acquisition_start = hw_dev_acquisition_start,
352 .dev_acquisition_stop = hw_dev_acquisition_stop,