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1 | /* | |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com> | |
5 | * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include "protocol.h" | |
23 | #include "libsigrok.h" | |
24 | #include "libsigrok-internal.h" | |
25 | ||
26 | #include <stdlib.h> | |
27 | #include <unistd.h> | |
28 | #include <string.h> | |
29 | ||
30 | #define DEFAULT_PROBES 2 | |
31 | #define SAMPLE_WIDTH 16 | |
32 | #define DEFAULT_SAMPLERATE 44100 | |
33 | // #define AUDIO_DEV "plughw:0,0" | |
34 | #define AUDIO_DEV "default" | |
35 | ||
36 | static const int hwcaps[] = { | |
37 | SR_HWCAP_SAMPLERATE, | |
38 | SR_HWCAP_LIMIT_SAMPLES, | |
39 | SR_HWCAP_CONTINUOUS, | |
40 | 0, | |
41 | }; | |
42 | ||
43 | static const char *probe_names[] = { | |
44 | "Channel 0", "Channel 1", | |
45 | NULL, | |
46 | }; | |
47 | ||
48 | SR_PRIV struct sr_dev_driver alsa_driver_info; | |
49 | static struct sr_dev_driver *di = &alsa_driver_info; | |
50 | ||
51 | static int clear_instances(void) | |
52 | { | |
53 | /* TODO */ | |
54 | ||
55 | return SR_OK; | |
56 | } | |
57 | ||
58 | static int hw_init(struct sr_context *sr_ctx) | |
59 | { | |
60 | struct drv_context *drvc; | |
61 | ||
62 | if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) { | |
63 | sr_err("Driver context malloc failed."); | |
64 | return SR_ERR_MALLOC; | |
65 | } | |
66 | ||
67 | drvc->sr_ctx = sr_ctx; | |
68 | di->priv = drvc; | |
69 | ||
70 | return SR_OK; | |
71 | } | |
72 | ||
73 | static GSList *hw_scan(GSList *options) | |
74 | { | |
75 | struct drv_context *drvc; | |
76 | struct dev_context *devc; | |
77 | struct sr_dev_inst *sdi; | |
78 | struct sr_probe *probe; | |
79 | GSList *devices; | |
80 | int i; | |
81 | ||
82 | (void)options; | |
83 | ||
84 | drvc = di->priv; | |
85 | drvc->instances = NULL; | |
86 | ||
87 | devices = NULL; | |
88 | ||
89 | if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) { | |
90 | sr_err("Device context malloc failed."); | |
91 | return NULL; | |
92 | } | |
93 | ||
94 | if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL))) { | |
95 | sr_err("Failed to create device instance."); | |
96 | return NULL; | |
97 | } | |
98 | ||
99 | /* Set the samplerate to a default value for now. */ | |
100 | devc->cur_samplerate = DEFAULT_SAMPLERATE; | |
101 | devc->num_probes = DEFAULT_PROBES; | |
102 | ||
103 | sdi->priv = devc; | |
104 | sdi->driver = di; | |
105 | ||
106 | for (i = 0; probe_names[i]; i++) { | |
107 | if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE, | |
108 | probe_names[i]))) { | |
109 | sr_err("Failed to create probe."); | |
110 | return NULL; | |
111 | } | |
112 | sdi->probes = g_slist_append(sdi->probes, probe); | |
113 | } | |
114 | ||
115 | drvc->instances = g_slist_append(drvc->instances, sdi); | |
116 | devices = g_slist_append(devices, sdi); | |
117 | ||
118 | return devices; | |
119 | } | |
120 | ||
121 | static GSList *hw_dev_list(void) | |
122 | { | |
123 | struct drv_context *drvc; | |
124 | ||
125 | drvc = di->priv; | |
126 | ||
127 | return drvc->instances; | |
128 | } | |
129 | ||
130 | static int hw_dev_open(struct sr_dev_inst *sdi) | |
131 | { | |
132 | struct dev_context *devc; | |
133 | int ret; | |
134 | ||
135 | devc = sdi->priv; | |
136 | ||
137 | sr_dbg("Opening audio device '%s' for stream capture.", AUDIO_DEV); | |
138 | ret = snd_pcm_open(&devc->capture_handle, AUDIO_DEV, | |
139 | SND_PCM_STREAM_CAPTURE, 0); | |
140 | if (ret < 0) { | |
141 | sr_err("Can't open audio device: %s.", snd_strerror(ret)); | |
142 | return SR_ERR; | |
143 | } | |
144 | ||
145 | sr_dbg("Allocating hardware parameter structure."); | |
146 | ret = snd_pcm_hw_params_malloc(&devc->hw_params); | |
147 | if (ret < 0) { | |
148 | sr_err("Can't allocate hardware parameter structure: %s.", | |
149 | snd_strerror(ret)); | |
150 | return SR_ERR_MALLOC; | |
151 | } | |
152 | ||
153 | sr_dbg("Initializing hardware parameter structure."); | |
154 | ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params); | |
155 | if (ret < 0) { | |
156 | sr_err("Can't initialize hardware parameter structure: %s.", | |
157 | snd_strerror(ret)); | |
158 | return SR_ERR; | |
159 | } | |
160 | ||
161 | return SR_OK; | |
162 | } | |
163 | ||
164 | static int hw_dev_close(struct sr_dev_inst *sdi) | |
165 | { | |
166 | int ret; | |
167 | struct dev_context *devc; | |
168 | ||
169 | devc = sdi->priv; | |
170 | ||
171 | sr_dbg("Closing device."); | |
172 | ||
173 | if (devc->hw_params) { | |
174 | sr_dbg("Freeing hardware parameters."); | |
175 | snd_pcm_hw_params_free(devc->hw_params); | |
176 | } else { | |
177 | sr_dbg("No hardware parameters, no need to free."); | |
178 | } | |
179 | ||
180 | if (devc->capture_handle) { | |
181 | sr_dbg("Closing PCM device."); | |
182 | if ((ret = snd_pcm_close(devc->capture_handle)) < 0) { | |
183 | sr_err("Failed to close device: %s.", | |
184 | snd_strerror(ret)); | |
185 | } | |
186 | } else { | |
187 | sr_dbg("No capture handle, no need to close audio device."); | |
188 | } | |
189 | ||
190 | return SR_OK; | |
191 | } | |
192 | ||
193 | static int hw_cleanup(void) | |
194 | { | |
195 | clear_instances(); | |
196 | ||
197 | return SR_OK; | |
198 | } | |
199 | ||
200 | static int hw_info_get(int info_id, const void **data, | |
201 | const struct sr_dev_inst *sdi) | |
202 | { | |
203 | struct dev_context *devc; | |
204 | ||
205 | if (info_id != SR_DI_HWCAPS) /* For SR_DI_HWCAPS sdi will be NULL. */ | |
206 | devc = sdi->priv; | |
207 | ||
208 | switch (info_id) { | |
209 | case SR_DI_HWCAPS: | |
210 | *data = hwcaps; | |
211 | break; | |
212 | case SR_DI_NUM_PROBES: | |
213 | *data = GINT_TO_POINTER(DEFAULT_PROBES); | |
214 | break; | |
215 | case SR_DI_PROBE_NAMES: | |
216 | *data = probe_names; | |
217 | break; | |
218 | case SR_DI_CUR_SAMPLERATE: | |
219 | *data = &devc->cur_samplerate; | |
220 | break; | |
221 | default: | |
222 | sr_err("Invalid info_id: %d.", info_id); | |
223 | return SR_ERR_ARG; | |
224 | } | |
225 | ||
226 | return SR_OK; | |
227 | } | |
228 | ||
229 | static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap, | |
230 | const void *value) | |
231 | { | |
232 | struct dev_context *devc; | |
233 | ||
234 | devc = sdi->priv; | |
235 | ||
236 | switch (hwcap) { | |
237 | case SR_HWCAP_SAMPLERATE: | |
238 | devc->cur_samplerate = *(const uint64_t *)value; | |
239 | break; | |
240 | case SR_HWCAP_LIMIT_SAMPLES: | |
241 | devc->limit_samples = *(const uint64_t *)value; | |
242 | break; | |
243 | default: | |
244 | sr_err("Unknown capability: %d.", hwcap); | |
245 | return SR_ERR; | |
246 | } | |
247 | ||
248 | return SR_OK; | |
249 | } | |
250 | ||
251 | static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi, | |
252 | void *cb_data) | |
253 | { | |
254 | struct sr_datafeed_packet packet; | |
255 | struct sr_datafeed_header header; | |
256 | struct sr_datafeed_meta_analog meta; | |
257 | struct dev_context *devc; | |
258 | int count, ret; | |
259 | ||
260 | devc = sdi->priv; | |
261 | devc->cb_data = cb_data; | |
262 | ||
263 | sr_dbg("Setting audio access type to RW/interleaved."); | |
264 | ret = snd_pcm_hw_params_set_access(devc->capture_handle, | |
265 | devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); | |
266 | if (ret < 0) { | |
267 | sr_err("Can't set audio access type: %s.", snd_strerror(ret)); | |
268 | return SR_ERR; | |
269 | } | |
270 | ||
271 | /* FIXME: Hardcoded for 16bits. */ | |
272 | sr_dbg("Setting audio sample format to signed 16bit (little endian)."); | |
273 | ret = snd_pcm_hw_params_set_format(devc->capture_handle, | |
274 | devc->hw_params, SND_PCM_FORMAT_S16_LE); | |
275 | if (ret < 0) { | |
276 | sr_err("Can't set audio sample format: %s.", snd_strerror(ret)); | |
277 | return SR_ERR; | |
278 | } | |
279 | ||
280 | sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.", | |
281 | devc->cur_samplerate); | |
282 | ret = snd_pcm_hw_params_set_rate(devc->capture_handle, devc->hw_params, | |
283 | (unsigned int)devc->cur_samplerate, 0); | |
284 | if (ret < 0) { | |
285 | sr_err("Can't set audio sample rate: %s.", snd_strerror(ret)); | |
286 | return SR_ERR; | |
287 | } | |
288 | ||
289 | sr_dbg("Setting audio channel count to %d.", devc->num_probes); | |
290 | ret = snd_pcm_hw_params_set_channels(devc->capture_handle, | |
291 | devc->hw_params, devc->num_probes); | |
292 | if (ret < 0) { | |
293 | sr_err("Can't set channel count: %s.", snd_strerror(ret)); | |
294 | return SR_ERR; | |
295 | } | |
296 | ||
297 | sr_dbg("Setting audio parameters."); | |
298 | ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params); | |
299 | if (ret < 0) { | |
300 | sr_err("Can't set parameters: %s.", snd_strerror(ret)); | |
301 | return SR_ERR; | |
302 | } | |
303 | ||
304 | sr_dbg("Preparing audio interface for use."); | |
305 | ret = snd_pcm_prepare(devc->capture_handle); | |
306 | if (ret < 0) { | |
307 | sr_err("Can't prepare audio interface for use: %s.", | |
308 | snd_strerror(ret)); | |
309 | return SR_ERR; | |
310 | } | |
311 | ||
312 | count = snd_pcm_poll_descriptors_count(devc->capture_handle); | |
313 | if (count < 1) { | |
314 | sr_err("Unable to obtain poll descriptors count."); | |
315 | return SR_ERR; | |
316 | } | |
317 | sr_spew("Obtained poll descriptor count: %d.", count); | |
318 | ||
319 | if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) { | |
320 | sr_err("Failed to malloc ufds."); | |
321 | return SR_ERR_MALLOC; | |
322 | } | |
323 | ||
324 | sr_err("Getting %d poll descriptors.", count); | |
325 | ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count); | |
326 | if (ret < 0) { | |
327 | sr_err("Unable to obtain poll descriptors: %s.", | |
328 | snd_strerror(ret)); | |
329 | g_free(devc->ufds); | |
330 | return SR_ERR; | |
331 | } | |
332 | ||
333 | /* Send header packet to the session bus. */ | |
334 | sr_dbg("Sending SR_DF_HEADER packet."); | |
335 | packet.type = SR_DF_HEADER; | |
336 | packet.payload = (uint8_t *)&header; | |
337 | header.feed_version = 1; | |
338 | gettimeofday(&header.starttime, NULL); | |
339 | sr_session_send(devc->cb_data, &packet); | |
340 | ||
341 | /* Send metadata about the SR_DF_ANALOG packets to come. */ | |
342 | sr_dbg("Sending SR_DF_META_ANALOG packet."); | |
343 | packet.type = SR_DF_META_ANALOG; | |
344 | packet.payload = &meta; | |
345 | meta.num_probes = devc->num_probes; | |
346 | sr_session_send(devc->cb_data, &packet); | |
347 | ||
348 | /* Poll every 10ms, or whenever some data comes in. */ | |
349 | sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10, | |
350 | alsa_receive_data, (void *)sdi); | |
351 | ||
352 | // g_free(devc->ufds); /* FIXME */ | |
353 | ||
354 | return SR_OK; | |
355 | } | |
356 | ||
357 | static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data) | |
358 | { | |
359 | struct sr_datafeed_packet packet; | |
360 | struct dev_context *devc; | |
361 | ||
362 | devc = sdi->priv; | |
363 | devc->cb_data = cb_data; | |
364 | ||
365 | sr_source_remove(devc->ufds[0].fd); | |
366 | ||
367 | /* Send end packet to the session bus. */ | |
368 | sr_dbg("Sending SR_DF_END packet."); | |
369 | packet.type = SR_DF_END; | |
370 | sr_session_send(cb_data, &packet); | |
371 | ||
372 | return SR_OK; | |
373 | } | |
374 | ||
375 | SR_PRIV struct sr_dev_driver alsa_driver_info = { | |
376 | .name = "alsa", | |
377 | .longname = "ALSA driver", | |
378 | .api_version = 1, | |
379 | .init = hw_init, | |
380 | .cleanup = hw_cleanup, | |
381 | .scan = hw_scan, | |
382 | .dev_list = hw_dev_list, | |
383 | .dev_clear = clear_instances, | |
384 | .dev_open = hw_dev_open, | |
385 | .dev_close = hw_dev_close, | |
386 | .info_get = hw_info_get, | |
387 | .dev_config_set = hw_dev_config_set, | |
388 | .dev_acquisition_start = hw_dev_acquisition_start, | |
389 | .dev_acquisition_stop = hw_dev_acquisition_stop, | |
390 | .priv = NULL, | |
391 | }; |