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 devc->hw_params = NULL;
48 g_free((void *)devc->samplerates);
49 devc->samplerates = NULL;
52 static int dev_clear(void)
54 return std_dev_clear(di, clear_helper);
57 static int init(struct sr_context *sr_ctx)
59 return std_init(sr_ctx, di, LOG_PREFIX);
62 static GSList *scan(GSList *options)
64 return alsa_scan(options, di);
67 static GSList *dev_list(void)
69 return ((struct drv_context *)(di->priv))->instances;
72 static int dev_open(struct sr_dev_inst *sdi)
74 struct dev_context *devc;
80 sr_err("devc->hwdev was NULL.");
84 sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
85 ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
86 SND_PCM_STREAM_CAPTURE, 0);
88 sr_err("Can't open audio device: %s.", snd_strerror(ret));
92 sr_dbg("Initializing hardware parameter structure.");
93 ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
95 sr_err("Can't initialize hardware parameter structure: %s.",
100 sdi->status = SR_ST_ACTIVE;
105 static int dev_close(struct sr_dev_inst *sdi)
108 struct dev_context *devc;
112 if (devc->capture_handle) {
113 sr_dbg("Closing PCM device.");
114 if ((ret = snd_pcm_close(devc->capture_handle)) < 0)
115 sr_err("Failed to close device: %s.",
117 devc->capture_handle = NULL;
118 sdi->status = SR_ST_INACTIVE;
120 sr_dbg("No capture handle, no need to close audio device.");
126 static int cleanup(void)
131 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
133 struct dev_context *devc;
136 case SR_CONF_SAMPLERATE:
138 *data = g_variant_new_uint64(devc->cur_samplerate);
147 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
149 struct dev_context *devc;
151 if (sdi->status != SR_ST_ACTIVE)
152 return SR_ERR_DEV_CLOSED;
157 case SR_CONF_SAMPLERATE:
158 alsa_set_samplerate(sdi, g_variant_get_uint64(data));
160 case SR_CONF_LIMIT_SAMPLES:
161 devc->limit_samples = g_variant_get_uint64(data);
170 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
172 struct dev_context *devc;
178 case SR_CONF_DEVICE_OPTIONS:
179 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
180 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
182 case SR_CONF_SAMPLERATE:
183 if (!sdi || !sdi->priv)
186 if (!devc->samplerates) {
187 sr_err("Instance did not contain a samplerate list.");
190 for (i = 0; devc->samplerates[i]; i++)
192 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
193 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
194 devc->samplerates, i, sizeof(uint64_t));
195 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
196 *data = g_variant_builder_end(&gvb);
205 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
207 struct dev_context *devc;
211 if (sdi->status != SR_ST_ACTIVE)
212 return SR_ERR_DEV_CLOSED;
215 devc->cb_data = cb_data;
216 devc->num_samples = 0;
218 sr_dbg("Setting audio access type to RW/interleaved.");
219 ret = snd_pcm_hw_params_set_access(devc->capture_handle,
220 devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
222 sr_err("Can't set audio access type: %s.", snd_strerror(ret));
226 /* FIXME: Hardcoded for 16bits. */
227 if (SND_PCM_FORMAT_S16 == SND_PCM_FORMAT_S16_LE)
228 endianness = "little endian";
230 endianness = "big endian";
231 sr_dbg("Setting audio sample format to signed 16bit (%s).", endianness);
232 ret = snd_pcm_hw_params_set_format(devc->capture_handle,
236 sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
240 sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
241 devc->cur_samplerate);
242 ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params,
243 (unsigned int)devc->cur_samplerate, 0);
245 sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
249 sr_dbg("Setting audio channel count to %d.", devc->num_probes);
250 ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
251 devc->hw_params, devc->num_probes);
253 sr_err("Can't set channel count: %s.", snd_strerror(ret));
257 sr_dbg("Setting audio parameters.");
258 ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
260 sr_err("Can't set parameters: %s.", snd_strerror(ret));
264 sr_dbg("Preparing audio interface for use.");
265 ret = snd_pcm_prepare(devc->capture_handle);
267 sr_err("Can't prepare audio interface for use: %s.",
272 count = snd_pcm_poll_descriptors_count(devc->capture_handle);
274 sr_err("Unable to obtain poll descriptors count.");
278 if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
279 sr_err("Failed to malloc ufds.");
280 return SR_ERR_MALLOC;
283 sr_spew("Getting %d poll descriptors.", count);
284 ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
286 sr_err("Unable to obtain poll descriptors: %s.",
292 /* Send header packet to the session bus. */
293 std_session_send_df_header(cb_data, LOG_PREFIX);
295 /* Poll every 10ms, or whenever some data comes in. */
296 sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
297 alsa_receive_data, (void *)sdi);
299 // g_free(devc->ufds); /* FIXME */
304 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
306 struct sr_datafeed_packet packet;
307 struct dev_context *devc;
310 devc->cb_data = cb_data;
312 sr_source_remove(devc->ufds[0].fd);
314 /* Send end packet to the session bus. */
315 sr_dbg("Sending SR_DF_END packet.");
316 packet.type = SR_DF_END;
317 sr_session_send(cb_data, &packet);
322 SR_PRIV struct sr_dev_driver alsa_driver_info = {
324 .longname = "ALSA driver",
329 .dev_list = dev_list,
330 .dev_clear = dev_clear,
331 .config_get = config_get,
332 .config_set = config_set,
333 .config_list = config_list,
334 .dev_open = dev_open,
335 .dev_close = dev_close,
336 .dev_acquisition_start = dev_acquisition_start,
337 .dev_acquisition_stop = dev_acquisition_stop,