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 void clear_helper(void *priv)
41 struct dev_context *devc;
45 snd_pcm_hw_params_free(devc->hw_params);
46 g_free((void *)devc->samplerates);
49 static int clear_instances(void)
51 return std_dev_clear(di, clear_helper);
54 static int init(struct sr_context *sr_ctx)
56 return std_hw_init(sr_ctx, di, LOG_PREFIX);
59 static GSList *scan(GSList *options)
61 return alsa_scan(options, di);
64 static GSList *dev_list(void)
66 return ((struct drv_context *)(di->priv))->instances;
69 static int dev_open(struct sr_dev_inst *sdi)
71 struct dev_context *devc;
77 sr_err("devc->hwdev was NULL.");
81 sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
82 ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
83 SND_PCM_STREAM_CAPTURE, 0);
85 sr_err("Can't open audio device: %s.", snd_strerror(ret));
89 sr_dbg("Initializing hardware parameter structure.");
90 ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
92 sr_err("Can't initialize hardware parameter structure: %s.",
97 sdi->status = SR_ST_ACTIVE;
102 static int dev_close(struct sr_dev_inst *sdi)
105 struct dev_context *devc;
109 if (devc->capture_handle) {
110 sr_dbg("Closing PCM device.");
111 if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
112 sr_err("Failed to close device: %s.",
114 devc->capture_handle = NULL;
115 sdi->status = SR_ST_INACTIVE;
118 sr_dbg("No capture handle, no need to close audio device.");
124 static int cleanup(void)
126 return clear_instances();
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 dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
205 struct dev_context *devc;
209 if (sdi->status != SR_ST_ACTIVE)
210 return SR_ERR_DEV_CLOSED;
213 devc->cb_data = cb_data;
214 devc->num_samples = 0;
216 sr_dbg("Setting audio access type to RW/interleaved.");
217 ret = snd_pcm_hw_params_set_access(devc->capture_handle,
218 devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
220 sr_err("Can't set audio access type: %s.", snd_strerror(ret));
224 /* FIXME: Hardcoded for 16bits. */
225 if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
226 endianness = "little endian";
228 endianness = "big endian";
229 sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness);
230 ret = snd_pcm_hw_params_set_format(devc->capture_handle,
234 sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
238 sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
239 devc->cur_samplerate);
240 ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
241 (unsigned int)devc->cur_samplerate, 0);
243 sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
247 sr_dbg("Setting audio channel count to %d.", devc->num_probes);
248 ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
249 devc->hw_params, devc->num_probes);
251 sr_err("Can't set channel count: %s.", snd_strerror(ret));
255 sr_dbg("Setting audio parameters.");
256 ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
258 sr_err("Can't set parameters: %s.", snd_strerror(ret));
262 sr_dbg("Preparing audio interface for use.");
263 ret = snd_pcm_prepare(devc->capture_handle);
265 sr_err("Can't prepare audio interface for use: %s.",
270 count = snd_pcm_poll_descriptors_count(devc->capture_handle);
272 sr_err("Unable to obtain poll descriptors count.");
276 if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
277 sr_err("Failed to malloc ufds.");
278 return SR_ERR_MALLOC;
281 sr_spew("Getting %d poll descriptors.", count);
282 ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
284 sr_err("Unable to obtain poll descriptors: %s.",
290 /* Send header packet to the session bus. */
291 std_session_send_df_header(cb_data, LOG_PREFIX);
293 /* Poll every 10ms, or whenever some data comes in. */
294 sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
295 alsa_receive_data, (void *)sdi);
297 // g_free(devc->ufds); /* FIXME */
302 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
304 struct sr_datafeed_packet packet;
305 struct dev_context *devc;
308 devc->cb_data = cb_data;
310 sr_source_remove(devc->ufds[0].fd);
312 /* Send end packet to the session bus. */
313 sr_dbg("Sending SR_DF_END packet.");
314 packet.type = SR_DF_END;
315 sr_session_send(cb_data, &packet);
320 SR_PRIV struct sr_dev_driver alsa_driver_info = {
322 .longname = "ALSA driver",
327 .dev_list = dev_list,
328 .dev_clear = clear_instances,
329 .config_get = config_get,
330 .config_set = config_set,
331 .config_list = config_list,
332 .dev_open = dev_open,
333 .dev_close = dev_close,
334 .dev_acquisition_start = dev_acquisition_start,
335 .dev_acquisition_stop = dev_acquisition_stop,