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afaa75b9 BV |
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 | ||
6ec6c43b | 20 | #include <config.h> |
0605f874 | 21 | #include <string.h> |
c1aae900 | 22 | #include <libsigrok/libsigrok.h> |
afaa75b9 BV |
23 | #include "libsigrok-internal.h" |
24 | ||
25 | #define LOG_PREFIX "output/wav" | |
26 | ||
0605f874 BV |
27 | /* Minimum/maximum number of samples per channel to put in a data chunk */ |
28 | #define MIN_DATA_CHUNK_SAMPLES 10 | |
29 | ||
30 | struct out_context { | |
7ea75009 | 31 | double scale; |
0605f874 BV |
32 | gboolean header_done; |
33 | uint64_t samplerate; | |
34 | int num_channels; | |
35 | GSList *channels; | |
36 | int chanbuf_size; | |
37 | int *chanbuf_used; | |
38 | uint8_t **chanbuf; | |
c7224164 | 39 | float *fdata; |
0605f874 BV |
40 | }; |
41 | ||
42 | static int realloc_chanbufs(const struct sr_output *o, int size) | |
43 | { | |
44 | struct out_context *outc; | |
45 | int i; | |
46 | ||
47 | outc = o->priv; | |
48 | for (i = 0; i < outc->num_channels; i++) { | |
176d785d | 49 | if (!(outc->chanbuf[i] = g_try_realloc(outc->chanbuf[i], sizeof(float) * size))) { |
0605f874 BV |
50 | sr_err("Unable to allocate enough output buffer memory."); |
51 | return SR_ERR; | |
52 | } | |
53 | outc->chanbuf_used[i] = 0; | |
54 | } | |
55 | outc->chanbuf_size = size; | |
56 | ||
57 | return SR_OK; | |
58 | } | |
59 | ||
60 | static int flush_chanbufs(const struct sr_output *o, GString *out) | |
61 | { | |
62 | struct out_context *outc; | |
364859ac BV |
63 | int num_samples, i, j; |
64 | char *buf, *bufp; | |
0605f874 BV |
65 | |
66 | outc = o->priv; | |
67 | ||
68 | /* Any one of them will do. */ | |
364859ac BV |
69 | num_samples = outc->chanbuf_used[0]; |
70 | if (!(buf = g_try_malloc(4 * num_samples * outc->num_channels))) { | |
0605f874 BV |
71 | sr_err("Unable to allocate enough interleaved output buffer memory."); |
72 | return SR_ERR; | |
73 | } | |
0605f874 | 74 | |
364859ac BV |
75 | bufp = buf; |
76 | for (i = 0; i < num_samples; i++) { | |
0605f874 | 77 | for (j = 0; j < outc->num_channels; j++) { |
364859ac BV |
78 | memcpy(bufp, outc->chanbuf[j] + i * 4, 4); |
79 | bufp += 4; | |
0605f874 BV |
80 | } |
81 | } | |
364859ac | 82 | g_string_append_len(out, buf, 4 * num_samples * outc->num_channels); |
0605f874 BV |
83 | g_free(buf); |
84 | ||
85 | for (i = 0; i < outc->num_channels; i++) | |
86 | outc->chanbuf_used[i] = 0; | |
87 | ||
88 | return SR_OK; | |
89 | } | |
90 | ||
afaa75b9 BV |
91 | static int init(struct sr_output *o, GHashTable *options) |
92 | { | |
0605f874 BV |
93 | struct out_context *outc; |
94 | struct sr_channel *ch; | |
95 | GSList *l; | |
afaa75b9 | 96 | |
0605f874 BV |
97 | outc = g_malloc0(sizeof(struct out_context)); |
98 | o->priv = outc; | |
dcc55fe9 | 99 | outc->scale = g_variant_get_double(g_hash_table_lookup(options, "scale")); |
7ea75009 | 100 | |
0605f874 BV |
101 | for (l = o->sdi->channels; l; l = l->next) { |
102 | ch = l->data; | |
103 | if (ch->type != SR_CHANNEL_ANALOG) | |
104 | continue; | |
105 | if (!ch->enabled) | |
106 | continue; | |
107 | outc->channels = g_slist_append(outc->channels, ch); | |
108 | outc->num_channels++; | |
109 | } | |
110 | ||
111 | outc->chanbuf = g_malloc0(sizeof(float *) * outc->num_channels); | |
112 | outc->chanbuf_used = g_malloc0(sizeof(int) * outc->num_channels); | |
113 | ||
114 | /* Start off the interleaved buffer with 100 samples/channel. */ | |
115 | realloc_chanbufs(o, 100); | |
116 | ||
afaa75b9 BV |
117 | return SR_OK; |
118 | } | |
119 | ||
0605f874 BV |
120 | static void add_data_chunk(const struct sr_output *o, GString *gs) |
121 | { | |
122 | struct out_context *outc; | |
123 | char tmp[4]; | |
124 | ||
125 | outc = o->priv; | |
126 | g_string_append(gs, "fmt "); | |
127 | /* Remaining chunk size */ | |
128 | WL32(tmp, 0x12); | |
129 | g_string_append_len(gs, tmp, 4); | |
130 | /* Format code 3 = IEEE float */ | |
131 | WL16(tmp, 0x0003); | |
132 | g_string_append_len(gs, tmp, 2); | |
133 | /* Number of channels */ | |
134 | WL16(tmp, outc->num_channels); | |
135 | g_string_append_len(gs, tmp, 2); | |
136 | /* Samplerate */ | |
137 | WL32(tmp, outc->samplerate); | |
138 | g_string_append_len(gs, tmp, 4); | |
139 | /* Byterate, using 32-bit floats. */ | |
140 | WL32(tmp, outc->samplerate * outc->num_channels * 4); | |
141 | g_string_append_len(gs, tmp, 4); | |
142 | /* Blockalign */ | |
143 | WL16(tmp, outc->num_channels * 4); | |
144 | g_string_append_len(gs, tmp, 2); | |
145 | /* Bits per sample */ | |
146 | WL16(tmp, 32); | |
147 | g_string_append_len(gs, tmp, 2); | |
148 | WL16(tmp, 0); | |
149 | g_string_append_len(gs, tmp, 2); | |
150 | ||
151 | g_string_append(gs, "data"); | |
152 | /* Data chunk size, max it out. */ | |
153 | WL32(tmp, 0xffffffff); | |
154 | g_string_append_len(gs, tmp, 4); | |
155 | } | |
156 | ||
157 | static GString *gen_header(const struct sr_output *o) | |
158 | { | |
159 | struct out_context *outc; | |
160 | GVariant *gvar; | |
161 | GString *header; | |
162 | char tmp[4]; | |
163 | ||
164 | outc = o->priv; | |
165 | if (outc->samplerate == 0) { | |
166 | if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE, | |
167 | &gvar) == SR_OK) { | |
168 | outc->samplerate = g_variant_get_uint64(gvar); | |
169 | g_variant_unref(gvar); | |
170 | } | |
171 | } | |
172 | ||
173 | header = g_string_sized_new(512); | |
174 | g_string_append(header, "RIFF"); | |
175 | /* Total size. Max out the field. */ | |
176 | WL32(tmp, 0xffffffff); | |
177 | g_string_append_len(header, tmp, 4); | |
178 | g_string_append(header, "WAVE"); | |
179 | add_data_chunk(o, header); | |
180 | ||
181 | return header; | |
182 | } | |
183 | ||
184 | /* | |
185 | * Stores the float in little-endian BINARY32 IEEE-754 2008 format. | |
186 | */ | |
187 | static void float_to_le(uint8_t *buf, float value) | |
188 | { | |
8cd15dd4 | 189 | uint8_t *old; |
0605f874 | 190 | |
8cd15dd4 | 191 | old = (uint8_t *)&value; |
0605f874 BV |
192 | #ifdef WORDS_BIGENDIAN |
193 | buf[0] = old[3]; | |
194 | buf[1] = old[2]; | |
195 | buf[2] = old[1]; | |
196 | buf[3] = old[0]; | |
197 | #else | |
198 | buf[0] = old[0]; | |
199 | buf[1] = old[1]; | |
200 | buf[2] = old[2]; | |
201 | buf[3] = old[3]; | |
202 | #endif | |
203 | } | |
204 | ||
205 | /* | |
206 | * Returns the number of samples used in the current channel buffers, | |
207 | * or -1 if they're not all the same. | |
208 | */ | |
209 | static int check_chanbuf_size(const struct sr_output *o) | |
210 | { | |
211 | struct out_context *outc; | |
212 | int size, i; | |
213 | ||
214 | outc = o->priv; | |
215 | size = 0; | |
216 | for (i = 0; i < outc->num_channels; i++) { | |
217 | if (size == 0) { | |
218 | if (outc->chanbuf_used[i] == 0) { | |
219 | /* Nothing in all the buffers yet. */ | |
220 | size = -1; | |
221 | break; | |
8cd15dd4 | 222 | } else { |
0605f874 BV |
223 | /* New high water mark. */ |
224 | size = outc->chanbuf_used[i]; | |
8cd15dd4 | 225 | } |
0605f874 BV |
226 | } else if (outc->chanbuf_used[i] != size) { |
227 | /* All channel buffers are not equally full yet. */ | |
228 | size = -1; | |
229 | break; | |
230 | } | |
231 | } | |
232 | ||
233 | return size; | |
234 | } | |
441e9eae | 235 | |
afaa75b9 BV |
236 | static int receive(const struct sr_output *o, const struct sr_datafeed_packet *packet, |
237 | GString **out) | |
238 | { | |
0605f874 BV |
239 | struct out_context *outc; |
240 | const struct sr_datafeed_meta *meta; | |
edb691fc | 241 | const struct sr_datafeed_analog *analog; |
0605f874 BV |
242 | const struct sr_config *src; |
243 | struct sr_channel *ch; | |
244 | GSList *l; | |
b73cac75 | 245 | const GSList *channels; |
7ea75009 | 246 | float f; |
b73cac75 ML |
247 | int num_channels, num_samples, size, *chan_idx, idx, i, j, ret; |
248 | float *data; | |
0605f874 BV |
249 | uint8_t *buf; |
250 | ||
251 | *out = NULL; | |
252 | if (!o || !o->sdi || !(outc = o->priv)) | |
253 | return SR_ERR_ARG; | |
254 | ||
255 | switch (packet->type) { | |
256 | case SR_DF_META: | |
257 | meta = packet->payload; | |
258 | for (l = meta->config; l; l = l->next) { | |
259 | src = l->data; | |
260 | if (src->key != SR_CONF_SAMPLERATE) | |
261 | continue; | |
262 | outc->samplerate = g_variant_get_uint64(src->data); | |
263 | } | |
264 | break; | |
edb691fc | 265 | case SR_DF_ANALOG: |
0605f874 BV |
266 | if (!outc->header_done) { |
267 | *out = gen_header(o); | |
268 | outc->header_done = TRUE; | |
8cd15dd4 | 269 | } else { |
0605f874 | 270 | *out = g_string_sized_new(512); |
8cd15dd4 | 271 | } |
0605f874 | 272 | |
edb691fc | 273 | analog = packet->payload; |
c1634386 UH |
274 | num_samples = analog->num_samples; |
275 | channels = analog->meaning->channels; | |
276 | num_channels = g_slist_length(analog->meaning->channels); | |
277 | if (!(data = g_try_realloc(outc->fdata, sizeof(float) * num_samples * num_channels))) | |
278 | return SR_ERR_MALLOC; | |
279 | outc->fdata = data; | |
280 | ret = sr_analog_to_float(analog, data); | |
281 | if (ret != SR_OK) | |
282 | return ret; | |
b73cac75 ML |
283 | |
284 | if (num_samples == 0) | |
0605f874 BV |
285 | return SR_OK; |
286 | ||
0605f874 BV |
287 | if (num_channels > outc->num_channels) { |
288 | sr_err("Packet has %d channels, but only %d were enabled.", | |
289 | num_channels, outc->num_channels); | |
290 | return SR_ERR; | |
291 | } | |
292 | ||
b73cac75 | 293 | if (num_samples > outc->chanbuf_size) { |
c1634386 | 294 | if (realloc_chanbufs(o, analog->num_samples) != SR_OK) |
0605f874 BV |
295 | return SR_ERR_MALLOC; |
296 | } | |
297 | ||
298 | /* Index the channels in this packet, so we can interleave quicker. */ | |
299 | chan_idx = g_malloc(sizeof(int) * outc->num_channels); | |
300 | for (i = 0; i < num_channels; i++) { | |
b73cac75 | 301 | ch = g_slist_nth_data((GSList *) channels, i); |
0605f874 BV |
302 | chan_idx[i] = g_slist_index(outc->channels, ch); |
303 | } | |
304 | ||
b73cac75 | 305 | for (i = 0; i < num_samples; i++) { |
0605f874 BV |
306 | for (j = 0; j < num_channels; j++) { |
307 | idx = chan_idx[j]; | |
308 | buf = outc->chanbuf[idx] + outc->chanbuf_used[idx]++ * 4; | |
17124cf9 | 309 | f = data[i * num_channels + j]; |
8cd15dd4 | 310 | if (outc->scale != 1.0) |
7ea75009 BV |
311 | f /= outc->scale; |
312 | float_to_le(buf, f); | |
0605f874 BV |
313 | } |
314 | } | |
315 | g_free(chan_idx); | |
316 | ||
317 | size = check_chanbuf_size(o); | |
318 | if (size > MIN_DATA_CHUNK_SAMPLES) | |
319 | if (flush_chanbufs(o, *out) != SR_OK) | |
320 | return SR_ERR; | |
321 | break; | |
322 | case SR_DF_END: | |
323 | size = check_chanbuf_size(o); | |
324 | if (size > 0) { | |
325 | *out = g_string_sized_new(4 * size * outc->num_channels); | |
326 | if (flush_chanbufs(o, *out) != SR_OK) | |
327 | return SR_ERR; | |
328 | } | |
329 | break; | |
330 | } | |
afaa75b9 BV |
331 | |
332 | return SR_OK; | |
333 | } | |
334 | ||
da3d141f SB |
335 | static struct sr_option options[] = { |
336 | { "scale", "Scale", "Scale values by factor", NULL, NULL }, | |
337 | ALL_ZERO | |
338 | }; | |
339 | ||
340 | static const struct sr_option *get_options(void) | |
341 | { | |
342 | if (!options[0].def) | |
8cd15dd4 | 343 | options[0].def = g_variant_ref_sink(g_variant_new_double(1.0)); |
da3d141f SB |
344 | |
345 | return options; | |
346 | } | |
347 | ||
afaa75b9 BV |
348 | static int cleanup(struct sr_output *o) |
349 | { | |
0605f874 BV |
350 | struct out_context *outc; |
351 | int i; | |
352 | ||
353 | outc = o->priv; | |
354 | g_slist_free(outc->channels); | |
da3d141f | 355 | g_variant_unref(options[0].def); |
0605f874 BV |
356 | for (i = 0; i < outc->num_channels; i++) |
357 | g_free(outc->chanbuf[i]); | |
358 | g_free(outc->chanbuf_used); | |
359 | g_free(outc->chanbuf); | |
c7224164 | 360 | g_free(outc->fdata); |
0605f874 BV |
361 | g_free(outc); |
362 | o->priv = NULL; | |
afaa75b9 BV |
363 | |
364 | return SR_OK; | |
365 | } | |
366 | ||
367 | SR_PRIV struct sr_output_module output_wav = { | |
368 | .id = "wav", | |
369 | .name = "WAV", | |
8cd15dd4 | 370 | .desc = "Microsoft WAV file format data", |
8a174d23 | 371 | .exts = (const char*[]){"wav", NULL}, |
3cd4b381 | 372 | .flags = 0, |
7ea75009 | 373 | .options = get_options, |
afaa75b9 BV |
374 | .init = init, |
375 | .receive = receive, | |
376 | .cleanup = cleanup, | |
377 | }; |