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 int32_t hwcaps[] = {
32 SR_CONF_LIMIT_SAMPLES,
36 SR_PRIV struct sr_dev_driver alsa_driver_info;
37 static struct sr_dev_driver *di = &alsa_driver_info;
39 static int clear_instances(void)
41 struct drv_context *drvc;
43 if (!(drvc = di->priv))
46 g_slist_free_full(drvc->instances, (GDestroyNotify)alsa_dev_inst_clear);
47 drvc->instances = NULL;
52 static int hw_init(struct sr_context *sr_ctx)
54 return std_hw_init(sr_ctx, di, LOG_PREFIX);
57 static GSList *hw_scan(GSList *options)
59 return alsa_scan(options, di);
62 static GSList *hw_dev_list(void)
64 return ((struct drv_context *)(di->priv))->instances;
67 static int hw_dev_open(struct sr_dev_inst *sdi)
69 struct dev_context *devc;
75 sr_err("devc->hwdev was NULL.");
79 sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
80 ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
81 SND_PCM_STREAM_CAPTURE, 0);
83 sr_err("Can't open audio device: %s.", snd_strerror(ret));
87 sr_dbg("Initializing hardware parameter structure.");
88 ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
90 sr_err("Can't initialize hardware parameter structure: %s.",
95 sdi->status = SR_ST_ACTIVE;
100 static int hw_dev_close(struct sr_dev_inst *sdi)
103 struct dev_context *devc;
107 if (devc->capture_handle) {
108 sr_dbg("Closing PCM device.");
109 if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
110 sr_err("Failed to close device: %s.",
112 devc->capture_handle = NULL;
113 sdi->status = SR_ST_INACTIVE;
116 sr_dbg("No capture handle, no need to close audio device.");
122 static int hw_cleanup(void)
129 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
131 struct dev_context *devc;
134 case SR_CONF_SAMPLERATE:
136 *data = g_variant_new_uint64(devc->cur_samplerate);
145 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
147 struct dev_context *devc;
149 if (sdi->status != SR_ST_ACTIVE)
150 return SR_ERR_DEV_CLOSED;
155 case SR_CONF_SAMPLERATE:
156 alsa_set_samplerate(sdi, g_variant_get_uint64(data));
158 case SR_CONF_LIMIT_SAMPLES:
159 devc->limit_samples = g_variant_get_uint64(data);
168 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
170 struct dev_context *devc;
176 case SR_CONF_DEVICE_OPTIONS:
177 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
178 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
180 case SR_CONF_SAMPLERATE:
181 if (!sdi || !sdi->priv)
184 if (!devc->samplerates) {
185 sr_err("Instance did not contain a samplerate list.");
188 for (i = 0; devc->samplerates[i]; i++)
190 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
191 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
192 devc->samplerates, i, sizeof(uint64_t));
193 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
194 *data = g_variant_builder_end(&gvb);
203 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
206 struct dev_context *devc;
210 if (sdi->status != SR_ST_ACTIVE)
211 return SR_ERR_DEV_CLOSED;
214 devc->cb_data = cb_data;
215 devc->num_samples = 0;
217 sr_dbg("Setting audio access type to RW/interleaved.");
218 ret = snd_pcm_hw_params_set_access(devc->capture_handle,
219 devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
221 sr_err("Can't set audio access type: %s.", snd_strerror(ret));
225 /* FIXME: Hardcoded for 16bits. */
226 if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
227 endianness = "little endian";
229 endianness = "big endian";
230 sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness);
231 ret = snd_pcm_hw_params_set_format(devc->capture_handle,
235 sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
239 sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
240 devc->cur_samplerate);
241 ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
242 (unsigned int)devc->cur_samplerate, 0);
244 sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
248 sr_dbg("Setting audio channel count to %d.", devc->num_probes);
249 ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
250 devc->hw_params, devc->num_probes);
252 sr_err("Can't set channel count: %s.", snd_strerror(ret));
256 sr_dbg("Setting audio parameters.");
257 ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
259 sr_err("Can't set parameters: %s.", snd_strerror(ret));
263 sr_dbg("Preparing audio interface for use.");
264 ret = snd_pcm_prepare(devc->capture_handle);
266 sr_err("Can't prepare audio interface for use: %s.",
271 count = snd_pcm_poll_descriptors_count(devc->capture_handle);
273 sr_err("Unable to obtain poll descriptors count.");
277 if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
278 sr_err("Failed to malloc ufds.");
279 return SR_ERR_MALLOC;
282 sr_spew("Getting %d poll descriptors.", count);
283 ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
285 sr_err("Unable to obtain poll descriptors: %s.",
291 /* Send header packet to the session bus. */
292 std_session_send_df_header(cb_data, LOG_PREFIX);
294 /* Poll every 10ms, or whenever some data comes in. */
295 sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
296 alsa_receive_data, (void *)sdi);
298 // g_free(devc->ufds); /* FIXME */
303 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
305 struct sr_datafeed_packet packet;
306 struct dev_context *devc;
309 devc->cb_data = cb_data;
311 sr_source_remove(devc->ufds[0].fd);
313 /* Send end packet to the session bus. */
314 sr_dbg("Sending SR_DF_END packet.");
315 packet.type = SR_DF_END;
316 sr_session_send(cb_data, &packet);
321 SR_PRIV struct sr_dev_driver alsa_driver_info = {
323 .longname = "ALSA driver",
326 .cleanup = hw_cleanup,
328 .dev_list = hw_dev_list,
329 .dev_clear = clear_instances,
330 .config_get = config_get,
331 .config_set = config_set,
332 .config_list = config_list,
333 .dev_open = hw_dev_open,
334 .dev_close = hw_dev_close,
335 .dev_acquisition_start = hw_dev_acquisition_start,
336 .dev_acquisition_stop = hw_dev_acquisition_stop,