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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 Bert Vermeulen <bert@biot.com> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <string.h> | |
21 | #include "libsigrok.h" | |
22 | #include "libsigrok-internal.h" | |
23 | ||
24 | #define LOG_PREFIX "output/wav" | |
25 | ||
26 | /* Minimum/maximum number of samples per channel to put in a data chunk */ | |
27 | #define MIN_DATA_CHUNK_SAMPLES 10 | |
28 | ||
29 | struct out_context { | |
30 | double scale; | |
31 | gboolean header_done; | |
32 | uint64_t samplerate; | |
33 | int num_channels; | |
34 | GSList *channels; | |
35 | int chanbuf_size; | |
36 | int *chanbuf_used; | |
37 | uint8_t **chanbuf; | |
38 | }; | |
39 | ||
40 | static int realloc_chanbufs(const struct sr_output *o, int size) | |
41 | { | |
42 | struct out_context *outc; | |
43 | int i; | |
44 | ||
45 | outc = o->priv; | |
46 | for (i = 0; i < outc->num_channels; i++) { | |
47 | if (!(outc->chanbuf[i] = g_try_realloc(outc->chanbuf[i], sizeof(float) * size))) { | |
48 | sr_err("Unable to allocate enough output buffer memory."); | |
49 | return SR_ERR; | |
50 | } | |
51 | outc->chanbuf_used[i] = 0; | |
52 | } | |
53 | outc->chanbuf_size = size; | |
54 | ||
55 | return SR_OK; | |
56 | } | |
57 | ||
58 | static int flush_chanbufs(const struct sr_output *o, GString *out) | |
59 | { | |
60 | struct out_context *outc; | |
61 | int num_samples, i, j; | |
62 | char *buf, *bufp; | |
63 | ||
64 | outc = o->priv; | |
65 | ||
66 | /* Any one of them will do. */ | |
67 | num_samples = outc->chanbuf_used[0]; | |
68 | if (!(buf = g_try_malloc(4 * num_samples * outc->num_channels))) { | |
69 | sr_err("Unable to allocate enough interleaved output buffer memory."); | |
70 | return SR_ERR; | |
71 | } | |
72 | ||
73 | bufp = buf; | |
74 | for (i = 0; i < num_samples; i++) { | |
75 | for (j = 0; j < outc->num_channels; j++) { | |
76 | memcpy(bufp, outc->chanbuf[j] + i * 4, 4); | |
77 | bufp += 4; | |
78 | } | |
79 | } | |
80 | g_string_append_len(out, buf, 4 * num_samples * outc->num_channels); | |
81 | g_free(buf); | |
82 | ||
83 | for (i = 0; i < outc->num_channels; i++) | |
84 | outc->chanbuf_used[i] = 0; | |
85 | ||
86 | return SR_OK; | |
87 | } | |
88 | ||
89 | static int init(struct sr_output *o, GHashTable *options) | |
90 | { | |
91 | struct out_context *outc; | |
92 | struct sr_channel *ch; | |
93 | GSList *l; | |
94 | ||
95 | outc = g_malloc0(sizeof(struct out_context)); | |
96 | o->priv = outc; | |
97 | outc->scale = g_variant_get_double(g_hash_table_lookup(options, "scale")); | |
98 | ||
99 | for (l = o->sdi->channels; l; l = l->next) { | |
100 | ch = l->data; | |
101 | if (ch->type != SR_CHANNEL_ANALOG) | |
102 | continue; | |
103 | if (!ch->enabled) | |
104 | continue; | |
105 | outc->channels = g_slist_append(outc->channels, ch); | |
106 | outc->num_channels++; | |
107 | } | |
108 | ||
109 | outc->chanbuf = g_malloc0(sizeof(float *) * outc->num_channels); | |
110 | outc->chanbuf_used = g_malloc0(sizeof(int) * outc->num_channels); | |
111 | ||
112 | /* Start off the interleaved buffer with 100 samples/channel. */ | |
113 | realloc_chanbufs(o, 100); | |
114 | ||
115 | return SR_OK; | |
116 | } | |
117 | ||
118 | static void add_data_chunk(const struct sr_output *o, GString *gs) | |
119 | { | |
120 | struct out_context *outc; | |
121 | char tmp[4]; | |
122 | ||
123 | outc = o->priv; | |
124 | g_string_append(gs, "fmt "); | |
125 | /* Remaining chunk size */ | |
126 | WL32(tmp, 0x12); | |
127 | g_string_append_len(gs, tmp, 4); | |
128 | /* Format code 3 = IEEE float */ | |
129 | WL16(tmp, 0x0003); | |
130 | g_string_append_len(gs, tmp, 2); | |
131 | /* Number of channels */ | |
132 | WL16(tmp, outc->num_channels); | |
133 | g_string_append_len(gs, tmp, 2); | |
134 | /* Samplerate */ | |
135 | WL32(tmp, outc->samplerate); | |
136 | g_string_append_len(gs, tmp, 4); | |
137 | /* Byterate, using 32-bit floats. */ | |
138 | WL32(tmp, outc->samplerate * outc->num_channels * 4); | |
139 | g_string_append_len(gs, tmp, 4); | |
140 | /* Blockalign */ | |
141 | WL16(tmp, outc->num_channels * 4); | |
142 | g_string_append_len(gs, tmp, 2); | |
143 | /* Bits per sample */ | |
144 | WL16(tmp, 32); | |
145 | g_string_append_len(gs, tmp, 2); | |
146 | WL16(tmp, 0); | |
147 | g_string_append_len(gs, tmp, 2); | |
148 | ||
149 | g_string_append(gs, "data"); | |
150 | /* Data chunk size, max it out. */ | |
151 | WL32(tmp, 0xffffffff); | |
152 | g_string_append_len(gs, tmp, 4); | |
153 | } | |
154 | ||
155 | static GString *gen_header(const struct sr_output *o) | |
156 | { | |
157 | struct out_context *outc; | |
158 | GVariant *gvar; | |
159 | GString *header; | |
160 | char tmp[4]; | |
161 | ||
162 | outc = o->priv; | |
163 | if (outc->samplerate == 0) { | |
164 | if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE, | |
165 | &gvar) == SR_OK) { | |
166 | outc->samplerate = g_variant_get_uint64(gvar); | |
167 | g_variant_unref(gvar); | |
168 | } | |
169 | } | |
170 | ||
171 | header = g_string_sized_new(512); | |
172 | g_string_append(header, "RIFF"); | |
173 | /* Total size. Max out the field. */ | |
174 | WL32(tmp, 0xffffffff); | |
175 | g_string_append_len(header, tmp, 4); | |
176 | g_string_append(header, "WAVE"); | |
177 | add_data_chunk(o, header); | |
178 | ||
179 | return header; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Stores the float in little-endian BINARY32 IEEE-754 2008 format. | |
184 | */ | |
185 | static void float_to_le(uint8_t *buf, float value) | |
186 | { | |
187 | char *old; | |
188 | ||
189 | old = (char *)&value; | |
190 | #ifdef WORDS_BIGENDIAN | |
191 | buf[0] = old[3]; | |
192 | buf[1] = old[2]; | |
193 | buf[2] = old[1]; | |
194 | buf[3] = old[0]; | |
195 | #else | |
196 | buf[0] = old[0]; | |
197 | buf[1] = old[1]; | |
198 | buf[2] = old[2]; | |
199 | buf[3] = old[3]; | |
200 | #endif | |
201 | } | |
202 | ||
203 | /* | |
204 | * Returns the number of samples used in the current channel buffers, | |
205 | * or -1 if they're not all the same. | |
206 | */ | |
207 | static int check_chanbuf_size(const struct sr_output *o) | |
208 | { | |
209 | struct out_context *outc; | |
210 | int size, i; | |
211 | ||
212 | outc = o->priv; | |
213 | size = 0; | |
214 | for (i = 0; i < outc->num_channels; i++) { | |
215 | if (size == 0) { | |
216 | if (outc->chanbuf_used[i] == 0) { | |
217 | /* Nothing in all the buffers yet. */ | |
218 | size = -1; | |
219 | break; | |
220 | } else | |
221 | /* New high water mark. */ | |
222 | size = outc->chanbuf_used[i]; | |
223 | } else if (outc->chanbuf_used[i] != size) { | |
224 | /* All channel buffers are not equally full yet. */ | |
225 | size = -1; | |
226 | break; | |
227 | } | |
228 | } | |
229 | ||
230 | return size; | |
231 | } | |
232 | ||
233 | static int receive(const struct sr_output *o, const struct sr_datafeed_packet *packet, | |
234 | GString **out) | |
235 | { | |
236 | struct out_context *outc; | |
237 | const struct sr_datafeed_meta *meta; | |
238 | const struct sr_datafeed_analog *analog; | |
239 | const struct sr_config *src; | |
240 | struct sr_channel *ch; | |
241 | GSList *l; | |
242 | float f; | |
243 | int num_channels, size, *chan_idx, idx, i, j; | |
244 | uint8_t *buf; | |
245 | ||
246 | *out = NULL; | |
247 | if (!o || !o->sdi || !(outc = o->priv)) | |
248 | return SR_ERR_ARG; | |
249 | ||
250 | switch (packet->type) { | |
251 | case SR_DF_META: | |
252 | meta = packet->payload; | |
253 | for (l = meta->config; l; l = l->next) { | |
254 | src = l->data; | |
255 | if (src->key != SR_CONF_SAMPLERATE) | |
256 | continue; | |
257 | outc->samplerate = g_variant_get_uint64(src->data); | |
258 | } | |
259 | break; | |
260 | case SR_DF_ANALOG: | |
261 | if (!outc->header_done) { | |
262 | *out = gen_header(o); | |
263 | outc->header_done = TRUE; | |
264 | } else | |
265 | *out = g_string_sized_new(512); | |
266 | ||
267 | analog = packet->payload; | |
268 | if (analog->num_samples == 0) | |
269 | return SR_OK; | |
270 | ||
271 | num_channels = g_slist_length(analog->channels); | |
272 | if (num_channels > outc->num_channels) { | |
273 | sr_err("Packet has %d channels, but only %d were enabled.", | |
274 | num_channels, outc->num_channels); | |
275 | return SR_ERR; | |
276 | } | |
277 | ||
278 | if (analog->num_samples > outc->chanbuf_size) { | |
279 | if (realloc_chanbufs(o, analog->num_samples) != SR_OK) | |
280 | return SR_ERR_MALLOC; | |
281 | } | |
282 | ||
283 | /* Index the channels in this packet, so we can interleave quicker. */ | |
284 | chan_idx = g_malloc(sizeof(int) * outc->num_channels); | |
285 | for (i = 0; i < num_channels; i++) { | |
286 | ch = g_slist_nth_data(analog->channels, i); | |
287 | chan_idx[i] = g_slist_index(outc->channels, ch); | |
288 | } | |
289 | ||
290 | for (i = 0; i < analog->num_samples; i++) { | |
291 | for (j = 0; j < num_channels; j++) { | |
292 | idx = chan_idx[j]; | |
293 | buf = outc->chanbuf[idx] + outc->chanbuf_used[idx]++ * 4; | |
294 | f = analog->data[i * num_channels + j]; | |
295 | if (outc->scale != 0.0) | |
296 | f /= outc->scale; | |
297 | float_to_le(buf, f); | |
298 | } | |
299 | } | |
300 | g_free(chan_idx); | |
301 | ||
302 | size = check_chanbuf_size(o); | |
303 | if (size > MIN_DATA_CHUNK_SAMPLES) | |
304 | if (flush_chanbufs(o, *out) != SR_OK) | |
305 | return SR_ERR; | |
306 | break; | |
307 | case SR_DF_END: | |
308 | size = check_chanbuf_size(o); | |
309 | if (size > 0) { | |
310 | *out = g_string_sized_new(4 * size * outc->num_channels); | |
311 | if (flush_chanbufs(o, *out) != SR_OK) | |
312 | return SR_ERR; | |
313 | } | |
314 | break; | |
315 | } | |
316 | ||
317 | return SR_OK; | |
318 | } | |
319 | ||
320 | static int cleanup(struct sr_output *o) | |
321 | { | |
322 | struct out_context *outc; | |
323 | int i; | |
324 | ||
325 | outc = o->priv; | |
326 | g_slist_free(outc->channels); | |
327 | for (i = 0; i < outc->num_channels; i++) | |
328 | g_free(outc->chanbuf[i]); | |
329 | g_free(outc->chanbuf_used); | |
330 | g_free(outc->chanbuf); | |
331 | g_free(outc); | |
332 | o->priv = NULL; | |
333 | ||
334 | return SR_OK; | |
335 | } | |
336 | ||
337 | static struct sr_option options[] = { | |
338 | { "scale", "Scale", "Scale values by factor", NULL, NULL }, | |
339 | ALL_ZERO | |
340 | }; | |
341 | ||
342 | static const struct sr_option *get_options(void) | |
343 | { | |
344 | if (!options[0].def) | |
345 | options[0].def = g_variant_ref_sink(g_variant_new_double(0.0)); | |
346 | ||
347 | return options; | |
348 | } | |
349 | ||
350 | SR_PRIV struct sr_output_module output_wav = { | |
351 | .id = "wav", | |
352 | .name = "WAV", | |
353 | .desc = "WAVE file format", | |
354 | .options = get_options, | |
355 | .init = init, | |
356 | .receive = receive, | |
357 | .cleanup = cleanup, | |
358 | }; | |
359 |