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1d36b4d2 | 1 | /* |
50985c20 | 2 | * This file is part of the libsigrok project. |
1d36b4d2 BV |
3 | * |
4 | * Copyright (C) 2013 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> |
1d36b4d2 BV |
21 | #include <sys/types.h> |
22 | #include <sys/stat.h> | |
23 | #include <unistd.h> | |
24 | #include <fcntl.h> | |
cb41a838 | 25 | #include <ctype.h> |
1d36b4d2 | 26 | #include <string.h> |
962d4344 | 27 | #include <stdint.h> |
c1aae900 | 28 | #include <libsigrok/libsigrok.h> |
1d36b4d2 BV |
29 | #include "libsigrok-internal.h" |
30 | ||
3544f848 | 31 | #define LOG_PREFIX "input/wav" |
1d36b4d2 | 32 | |
cb41a838 | 33 | /* How many bytes at a time to process and send to the session bus. */ |
9a4fd01a | 34 | #define CHUNK_SIZE (1 * 1024 * 1024 * sizeof(float)) |
17bfaca6 BV |
35 | |
36 | /* Minimum size of header + 1 8-bit mono PCM sample. */ | |
37 | #define MIN_DATA_CHUNK_OFFSET 45 | |
38 | ||
cb41a838 | 39 | /* Expect to find the "data" chunk within this offset from the start. */ |
b944e336 | 40 | #define MAX_DATA_CHUNK_OFFSET 1024 |
cb41a838 | 41 | |
76598cda UH |
42 | #define WAVE_FORMAT_PCM_ 0x0001 |
43 | #define WAVE_FORMAT_IEEE_FLOAT_ 0x0003 | |
44 | #define WAVE_FORMAT_EXTENSIBLE_ 0xfffe | |
1d36b4d2 BV |
45 | |
46 | struct context { | |
d0181813 | 47 | gboolean started; |
17bfaca6 | 48 | int fmt_code; |
1d36b4d2 BV |
49 | uint64_t samplerate; |
50 | int samplesize; | |
51 | int num_channels; | |
cb41a838 | 52 | int unitsize; |
17bfaca6 | 53 | gboolean found_data; |
1d36b4d2 BV |
54 | }; |
55 | ||
17bfaca6 | 56 | static int parse_wav_header(GString *buf, struct context *inc) |
1d36b4d2 | 57 | { |
17bfaca6 | 58 | uint64_t samplerate; |
cbd9e6e9 | 59 | unsigned int fmt_code, samplesize, num_channels, unitsize; |
1d36b4d2 | 60 | |
cbd9e6e9 | 61 | if (buf->len < MIN_DATA_CHUNK_OFFSET) |
d0181813 | 62 | return SR_ERR_NA; |
1d36b4d2 | 63 | |
962d4344 BV |
64 | fmt_code = RL16(buf->str + 20); |
65 | samplerate = RL32(buf->str + 24); | |
cbd9e6e9 | 66 | |
962d4344 BV |
67 | samplesize = RL16(buf->str + 32); |
68 | num_channels = RL16(buf->str + 22); | |
cbd9e6e9 BV |
69 | if (num_channels == 0) |
70 | return SR_ERR; | |
17bfaca6 | 71 | unitsize = samplesize / num_channels; |
e8779db7 BV |
72 | if (unitsize != 1 && unitsize != 2 && unitsize != 4) { |
73 | sr_err("Only 8, 16 or 32 bits per sample supported."); | |
74 | return SR_ERR_DATA; | |
75 | } | |
76 | ||
76598cda UH |
77 | if (fmt_code == WAVE_FORMAT_PCM_) { |
78 | } else if (fmt_code == WAVE_FORMAT_IEEE_FLOAT_) { | |
17bfaca6 BV |
79 | if (unitsize != 4) { |
80 | sr_err("only 32-bit floats supported."); | |
4f979115 | 81 | return SR_ERR_DATA; |
17bfaca6 | 82 | } |
76598cda | 83 | } else if (fmt_code == WAVE_FORMAT_EXTENSIBLE_) { |
cbd9e6e9 BV |
84 | if (buf->len < 70) |
85 | /* Not enough for extensible header and next chunk. */ | |
d0181813 | 86 | return SR_ERR_NA; |
cbd9e6e9 BV |
87 | |
88 | if (RL16(buf->str + 16) != 40) { | |
89 | sr_err("WAV extensible format chunk must be 40 bytes."); | |
90 | return SR_ERR; | |
91 | } | |
92 | if (RL16(buf->str + 36) != 22) { | |
93 | sr_err("WAV extension must be 22 bytes."); | |
94 | return SR_ERR; | |
95 | } | |
96 | if (RL16(buf->str + 34) != RL16(buf->str + 38)) { | |
97 | sr_err("Reduced valid bits per sample not supported."); | |
4f979115 | 98 | return SR_ERR_DATA; |
cbd9e6e9 BV |
99 | } |
100 | /* Real format code is the first two bytes of the GUID. */ | |
101 | fmt_code = RL16(buf->str + 44); | |
76598cda | 102 | if (fmt_code != WAVE_FORMAT_PCM_ && fmt_code != WAVE_FORMAT_IEEE_FLOAT_) { |
cbd9e6e9 | 103 | sr_err("Only PCM and floating point samples are supported."); |
4f979115 | 104 | return SR_ERR_DATA; |
cbd9e6e9 | 105 | } |
76598cda | 106 | if (fmt_code == WAVE_FORMAT_IEEE_FLOAT_ && unitsize != 4) { |
28d9df72 MC |
107 | sr_err("only 32-bit floats supported."); |
108 | return SR_ERR_DATA; | |
109 | } | |
17bfaca6 BV |
110 | } else { |
111 | sr_err("Only PCM and floating point samples are supported."); | |
4f979115 | 112 | return SR_ERR_DATA; |
17bfaca6 | 113 | } |
1d36b4d2 | 114 | |
17bfaca6 BV |
115 | if (inc) { |
116 | inc->fmt_code = fmt_code; | |
117 | inc->samplerate = samplerate; | |
118 | inc->samplesize = samplesize; | |
119 | inc->num_channels = num_channels; | |
120 | inc->unitsize = unitsize; | |
121 | inc->found_data = FALSE; | |
122 | } | |
1d36b4d2 BV |
123 | |
124 | return SR_OK; | |
125 | } | |
126 | ||
17bfaca6 | 127 | static int format_match(GHashTable *metadata) |
1d36b4d2 | 128 | { |
17bfaca6 | 129 | GString *buf; |
4f979115 | 130 | int ret; |
1d36b4d2 | 131 | |
17bfaca6 BV |
132 | buf = g_hash_table_lookup(metadata, GINT_TO_POINTER(SR_INPUT_META_HEADER)); |
133 | if (strncmp(buf->str, "RIFF", 4)) | |
4f979115 | 134 | return SR_ERR; |
17bfaca6 | 135 | if (strncmp(buf->str + 8, "WAVE", 4)) |
4f979115 | 136 | return SR_ERR; |
17bfaca6 | 137 | if (strncmp(buf->str + 12, "fmt ", 4)) |
4f979115 | 138 | return SR_ERR; |
17bfaca6 BV |
139 | /* |
140 | * Only gets called when we already know this is a WAV file, so | |
141 | * this parser can log error messages. | |
142 | */ | |
4f979115 BV |
143 | if ((ret = parse_wav_header(buf, NULL)) != SR_OK) |
144 | return ret; | |
1d36b4d2 | 145 | |
4f979115 | 146 | return SR_OK; |
1d36b4d2 BV |
147 | } |
148 | ||
17bfaca6 | 149 | static int init(struct sr_input *in, GHashTable *options) |
1d36b4d2 | 150 | { |
17bfaca6 | 151 | (void)options; |
1d36b4d2 | 152 | |
aac29cc1 | 153 | in->sdi = g_malloc0(sizeof(struct sr_dev_inst)); |
d0181813 | 154 | in->priv = g_malloc0(sizeof(struct context)); |
1d36b4d2 BV |
155 | |
156 | return SR_OK; | |
157 | } | |
158 | ||
17bfaca6 | 159 | static int find_data_chunk(GString *buf, int initial_offset) |
cb41a838 | 160 | { |
17bfaca6 | 161 | unsigned int offset, i; |
cb41a838 BV |
162 | |
163 | offset = initial_offset; | |
0c5f2abc | 164 | while (offset < MIN(MAX_DATA_CHUNK_OFFSET, buf->len)) { |
17bfaca6 | 165 | if (!memcmp(buf->str + offset, "data", 4)) |
cb41a838 BV |
166 | /* Skip into the samples. */ |
167 | return offset + 8; | |
168 | for (i = 0; i < 4; i++) { | |
94b138a3 | 169 | if (!isalnum(buf->str[offset + i]) |
17bfaca6 | 170 | && !isblank(buf->str[offset + i])) |
cb41a838 BV |
171 | /* Doesn't look like a chunk ID. */ |
172 | return -1; | |
173 | } | |
174 | /* Skip past this chunk. */ | |
962d4344 | 175 | offset += 8 + RL32(buf->str + offset + 4); |
cb41a838 BV |
176 | } |
177 | ||
b944e336 SB |
178 | if (offset > MAX_DATA_CHUNK_OFFSET) |
179 | return -1; | |
180 | ||
cb41a838 BV |
181 | return offset; |
182 | } | |
183 | ||
17bfaca6 BV |
184 | static void send_chunk(const struct sr_input *in, int offset, int num_samples) |
185 | { | |
186 | struct sr_datafeed_packet packet; | |
0f33aaef UH |
187 | struct sr_datafeed_analog analog; |
188 | struct sr_analog_encoding encoding; | |
189 | struct sr_analog_meaning meaning; | |
190 | struct sr_analog_spec spec; | |
17bfaca6 | 191 | struct context *inc; |
2cff7a2b | 192 | float *fdata; |
17bfaca6 BV |
193 | int total_samples, samplenum; |
194 | char *s, *d; | |
1d36b4d2 | 195 | |
7db06394 | 196 | inc = in->priv; |
17bfaca6 BV |
197 | |
198 | s = in->buf->str + offset; | |
2cff7a2b | 199 | fdata = g_malloc0(CHUNK_SIZE * sizeof(float)); |
17bfaca6 | 200 | d = (char *)fdata; |
17bfaca6 BV |
201 | total_samples = num_samples * inc->num_channels; |
202 | for (samplenum = 0; samplenum < total_samples; samplenum++) { | |
76598cda | 203 | if (inc->fmt_code == WAVE_FORMAT_PCM_) { |
8b5aefc6 | 204 | switch (inc->unitsize) { |
17bfaca6 BV |
205 | case 1: |
206 | /* 8-bit PCM samples are unsigned. */ | |
8b5aefc6 | 207 | fdata[samplenum] = *(uint8_t*)(s) / (float)255; |
17bfaca6 BV |
208 | break; |
209 | case 2: | |
8b5aefc6 | 210 | fdata[samplenum] = RL16S(s) / (float)INT16_MAX; |
17bfaca6 BV |
211 | break; |
212 | case 4: | |
8b5aefc6 | 213 | fdata[samplenum] = RL32S(s) / (float)INT32_MAX; |
17bfaca6 BV |
214 | break; |
215 | } | |
216 | } else { | |
217 | /* BINARY32 float */ | |
cb41a838 | 218 | #ifdef WORDS_BIGENDIAN |
28d9df72 | 219 | int i; |
17bfaca6 | 220 | for (i = 0; i < inc->unitsize; i++) |
28d9df72 | 221 | d[i] = s[inc->unitsize - 1 - i]; |
cb41a838 | 222 | #else |
17bfaca6 | 223 | memcpy(d, s, inc->unitsize); |
cb41a838 | 224 | #endif |
1d36b4d2 | 225 | } |
17bfaca6 BV |
226 | s += inc->unitsize; |
227 | d += inc->unitsize; | |
228 | } | |
0f33aaef | 229 | |
7dcaddd3 UH |
230 | /* TODO: Use proper 'digits' value for this device (and its modes). */ |
231 | sr_analog_init(&analog, &encoding, &meaning, &spec, 2); | |
0f33aaef | 232 | packet.type = SR_DF_ANALOG; |
17bfaca6 | 233 | packet.payload = &analog; |
17bfaca6 | 234 | analog.num_samples = num_samples; |
17bfaca6 | 235 | analog.data = fdata; |
0f33aaef UH |
236 | analog.meaning->channels = in->sdi->channels; |
237 | analog.meaning->mq = 0; | |
238 | analog.meaning->mqflags = 0; | |
239 | analog.meaning->unit = 0; | |
17bfaca6 | 240 | sr_session_send(in->sdi, &packet); |
2cff7a2b | 241 | g_free(fdata); |
17bfaca6 BV |
242 | } |
243 | ||
7066fd46 | 244 | static int process_buffer(struct sr_input *in) |
17bfaca6 | 245 | { |
7066fd46 | 246 | struct context *inc; |
d0181813 BV |
247 | struct sr_datafeed_packet packet; |
248 | struct sr_datafeed_meta meta; | |
d0181813 | 249 | struct sr_config *src; |
d0181813 | 250 | int offset, chunk_samples, total_samples, processed, max_chunk_samples; |
7066fd46 | 251 | int num_samples, i; |
17bfaca6 | 252 | |
d0181813 | 253 | inc = in->priv; |
d0181813 | 254 | if (!inc->started) { |
bee2b016 | 255 | std_session_send_df_header(in->sdi); |
d0181813 BV |
256 | |
257 | packet.type = SR_DF_META; | |
258 | packet.payload = &meta; | |
259 | src = sr_config_new(SR_CONF_SAMPLERATE, g_variant_new_uint64(inc->samplerate)); | |
260 | meta.config = g_slist_append(NULL, src); | |
261 | sr_session_send(in->sdi, &packet); | |
c01378c9 | 262 | g_slist_free(meta.config); |
d0181813 BV |
263 | sr_config_free(src); |
264 | ||
265 | inc->started = TRUE; | |
17bfaca6 | 266 | } |
17bfaca6 BV |
267 | |
268 | if (!inc->found_data) { | |
269 | /* Skip past size of 'fmt ' chunk. */ | |
962d4344 | 270 | i = 20 + RL32(in->buf->str + 16); |
17bfaca6 BV |
271 | offset = find_data_chunk(in->buf, i); |
272 | if (offset < 0) { | |
273 | if (in->buf->len > MAX_DATA_CHUNK_OFFSET) { | |
274 | sr_err("Couldn't find data chunk."); | |
275 | return SR_ERR; | |
276 | } | |
277 | } | |
278 | inc->found_data = TRUE; | |
279 | } else | |
280 | offset = 0; | |
281 | ||
282 | /* Round off up to the last channels * unitsize boundary. */ | |
288f8ce2 SB |
283 | chunk_samples = (in->buf->len - offset) / inc->samplesize; |
284 | max_chunk_samples = CHUNK_SIZE / inc->samplesize; | |
17bfaca6 BV |
285 | processed = 0; |
286 | total_samples = chunk_samples; | |
287 | while (processed < total_samples) { | |
288 | if (chunk_samples > max_chunk_samples) | |
289 | num_samples = max_chunk_samples; | |
290 | else | |
291 | num_samples = chunk_samples; | |
292 | send_chunk(in, offset, num_samples); | |
288f8ce2 | 293 | offset += num_samples * inc->samplesize; |
17bfaca6 BV |
294 | chunk_samples -= num_samples; |
295 | processed += num_samples; | |
296 | } | |
297 | ||
298 | if ((unsigned int)offset < in->buf->len) { | |
299 | /* | |
300 | * The incoming buffer wasn't processed completely. Stash | |
301 | * the leftover data for next time. | |
302 | */ | |
303 | g_string_erase(in->buf, 0, offset); | |
304 | } else | |
305 | g_string_truncate(in->buf, 0); | |
1d36b4d2 BV |
306 | |
307 | return SR_OK; | |
308 | } | |
309 | ||
7066fd46 BV |
310 | static int receive(struct sr_input *in, GString *buf) |
311 | { | |
312 | struct context *inc; | |
313 | int ret; | |
74c9a8d2 | 314 | char channelname[8]; |
7066fd46 BV |
315 | |
316 | g_string_append_len(in->buf, buf->str, buf->len); | |
317 | ||
318 | if (in->buf->len < MIN_DATA_CHUNK_OFFSET) { | |
319 | /* | |
320 | * Don't even try until there's enough room | |
321 | * for the data segment to start. | |
322 | */ | |
323 | return SR_OK; | |
324 | } | |
325 | ||
326 | inc = in->priv; | |
327 | if (!in->sdi_ready) { | |
328 | if ((ret = parse_wav_header(in->buf, inc)) == SR_ERR_NA) | |
329 | /* Not enough data yet. */ | |
330 | return SR_OK; | |
331 | else if (ret != SR_OK) | |
332 | return ret; | |
333 | ||
74c9a8d2 | 334 | for (int i = 0; i < inc->num_channels; i++) { |
00ed77f2 | 335 | snprintf(channelname, sizeof(channelname), "CH%d", i + 1); |
74c9a8d2 SB |
336 | sr_channel_new(in->sdi, i, SR_CHANNEL_ANALOG, TRUE, channelname); |
337 | } | |
338 | ||
7066fd46 BV |
339 | /* sdi is ready, notify frontend. */ |
340 | in->sdi_ready = TRUE; | |
341 | return SR_OK; | |
342 | } | |
343 | ||
344 | ret = process_buffer(in); | |
345 | ||
18078d05 | 346 | return ret; |
7066fd46 BV |
347 | } |
348 | ||
349 | static int end(struct sr_input *in) | |
7db06394 | 350 | { |
d0181813 | 351 | struct context *inc; |
7066fd46 BV |
352 | int ret; |
353 | ||
354 | if (in->sdi_ready) | |
355 | ret = process_buffer(in); | |
356 | else | |
357 | ret = SR_OK; | |
0a4d68f7 | 358 | |
d0181813 | 359 | inc = in->priv; |
3be42bc2 | 360 | if (inc->started) |
bee2b016 | 361 | std_session_send_df_end(in->sdi); |
7db06394 | 362 | |
7066fd46 | 363 | return ret; |
7db06394 BV |
364 | } |
365 | ||
ab4c27cf SA |
366 | static int reset(struct sr_input *in) |
367 | { | |
368 | struct context *inc = in->priv; | |
369 | ||
370 | inc->started = FALSE; | |
371 | g_string_truncate(in->buf, 0); | |
372 | ||
373 | return SR_OK; | |
374 | } | |
375 | ||
d4c93774 | 376 | SR_PRIV struct sr_input_module input_wav = { |
1d36b4d2 | 377 | .id = "wav", |
17bfaca6 | 378 | .name = "WAV", |
b20eb520 | 379 | .desc = "Microsoft WAV file format data", |
c7bc82ff | 380 | .exts = (const char*[]){"wav", NULL}, |
17bfaca6 | 381 | .metadata = { SR_INPUT_META_HEADER | SR_INPUT_META_REQUIRED }, |
1d36b4d2 BV |
382 | .format_match = format_match, |
383 | .init = init, | |
17bfaca6 | 384 | .receive = receive, |
7066fd46 | 385 | .end = end, |
ab4c27cf | 386 | .reset = reset, |
1d36b4d2 | 387 | }; |