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1 | /* | |
2 | * This file is part of the libsigrok project. | |
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 | ||
20 | #include <sys/types.h> | |
21 | #include <sys/stat.h> | |
22 | #include <unistd.h> | |
23 | #include <fcntl.h> | |
24 | #include <ctype.h> | |
25 | #include <string.h> | |
26 | #include "libsigrok.h" | |
27 | #include "libsigrok-internal.h" | |
28 | ||
29 | #define LOG_PREFIX "input/wav" | |
30 | ||
31 | /* How many bytes at a time to process and send to the session bus. */ | |
32 | #define CHUNK_SIZE 4096 | |
33 | ||
34 | /* Minimum size of header + 1 8-bit mono PCM sample. */ | |
35 | #define MIN_DATA_CHUNK_OFFSET 45 | |
36 | ||
37 | /* Expect to find the "data" chunk within this offset from the start. */ | |
38 | #define MAX_DATA_CHUNK_OFFSET 256 | |
39 | ||
40 | #define WAVE_FORMAT_PCM 1 | |
41 | #define WAVE_FORMAT_IEEE_FLOAT 3 | |
42 | ||
43 | struct context { | |
44 | int fmt_code; | |
45 | uint64_t samplerate; | |
46 | int samplesize; | |
47 | int num_channels; | |
48 | int unitsize; | |
49 | gboolean found_data; | |
50 | }; | |
51 | ||
52 | static int parse_wav_header(GString *buf, struct context *inc) | |
53 | { | |
54 | uint64_t samplerate; | |
55 | int fmt_code, samplesize, num_channels, unitsize; | |
56 | ||
57 | if (buf->len < MIN_DATA_CHUNK_OFFSET) { | |
58 | return SR_ERR; | |
59 | } | |
60 | ||
61 | fmt_code = GUINT16_FROM_LE(*(uint16_t *)(buf->str + 20)); | |
62 | samplerate = GUINT32_FROM_LE(*(uint32_t *)(buf->str + 24)); | |
63 | samplesize = GUINT16_FROM_LE(*(uint16_t *)(buf->str + 32)); | |
64 | num_channels = GUINT16_FROM_LE(*(uint16_t *)(buf->str + 22)); | |
65 | /* TODO div0 */ | |
66 | unitsize = samplesize / num_channels; | |
67 | ||
68 | if (fmt_code == WAVE_FORMAT_PCM) { | |
69 | if (samplesize != 1 && samplesize != 2 && samplesize != 4) { | |
70 | sr_err("only 8, 16 or 32 bits per sample supported."); | |
71 | return SR_ERR; | |
72 | } | |
73 | } else if (fmt_code == WAVE_FORMAT_IEEE_FLOAT) { | |
74 | if (unitsize != 4) { | |
75 | sr_err("only 32-bit floats supported."); | |
76 | return SR_ERR; | |
77 | } | |
78 | } else { | |
79 | sr_err("Only PCM and floating point samples are supported."); | |
80 | return SR_ERR; | |
81 | } | |
82 | ||
83 | if (inc) { | |
84 | inc->fmt_code = fmt_code; | |
85 | inc->samplerate = samplerate; | |
86 | inc->samplesize = samplesize; | |
87 | inc->num_channels = num_channels; | |
88 | inc->unitsize = unitsize; | |
89 | inc->found_data = FALSE; | |
90 | } | |
91 | ||
92 | return SR_OK; | |
93 | } | |
94 | ||
95 | static int format_match(GHashTable *metadata) | |
96 | { | |
97 | GString *buf; | |
98 | ||
99 | buf = g_hash_table_lookup(metadata, GINT_TO_POINTER(SR_INPUT_META_HEADER)); | |
100 | if (strncmp(buf->str, "RIFF", 4)) | |
101 | return FALSE; | |
102 | if (strncmp(buf->str + 8, "WAVE", 4)) | |
103 | return FALSE; | |
104 | if (strncmp(buf->str + 12, "fmt ", 4)) | |
105 | return FALSE; | |
106 | /* | |
107 | * Only gets called when we already know this is a WAV file, so | |
108 | * this parser can log error messages. | |
109 | */ | |
110 | if (parse_wav_header(buf, NULL) != SR_OK) | |
111 | return FALSE; | |
112 | ||
113 | return TRUE; | |
114 | } | |
115 | ||
116 | static int init(struct sr_input *in, GHashTable *options) | |
117 | { | |
118 | (void)options; | |
119 | ||
120 | in->sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, NULL, NULL, NULL); | |
121 | ||
122 | return SR_OK; | |
123 | } | |
124 | ||
125 | static int find_data_chunk(GString *buf, int initial_offset) | |
126 | { | |
127 | unsigned int offset, i; | |
128 | ||
129 | offset = initial_offset; | |
130 | while(offset < MIN(MAX_DATA_CHUNK_OFFSET, buf->len)) { | |
131 | if (!memcmp(buf->str + offset, "data", 4)) | |
132 | /* Skip into the samples. */ | |
133 | return offset + 8; | |
134 | for (i = 0; i < 4; i++) { | |
135 | if (!isalpha(buf->str[offset + i]) | |
136 | && !isascii(buf->str[offset + i]) | |
137 | && !isblank(buf->str[offset + i])) | |
138 | /* Doesn't look like a chunk ID. */ | |
139 | return -1; | |
140 | } | |
141 | /* Skip past this chunk. */ | |
142 | offset += 8 + GUINT32_FROM_LE(*(uint32_t *)(buf->str + offset + 4)); | |
143 | } | |
144 | ||
145 | return offset; | |
146 | } | |
147 | ||
148 | static int initial_receive(struct sr_input *in) | |
149 | { | |
150 | struct sr_datafeed_packet packet; | |
151 | struct sr_datafeed_meta meta; | |
152 | struct sr_channel *ch; | |
153 | struct sr_config *src; | |
154 | struct context *inc; | |
155 | int i; | |
156 | char channelname[8]; | |
157 | ||
158 | if (!in->buf) | |
159 | /* Shouldn't happen. */ | |
160 | return SR_ERR; | |
161 | ||
162 | inc = in->priv = g_malloc(sizeof(struct context)); | |
163 | if (parse_wav_header(in->buf, inc) != SR_OK) | |
164 | return SR_ERR; | |
165 | ||
166 | for (i = 0; i < inc->num_channels; i++) { | |
167 | snprintf(channelname, 8, "CH%d", i + 1); | |
168 | ch = sr_channel_new(i, SR_CHANNEL_ANALOG, TRUE, channelname); | |
169 | in->sdi->channels = g_slist_append(in->sdi->channels, ch); | |
170 | } | |
171 | ||
172 | std_session_send_df_header(in->sdi, LOG_PREFIX); | |
173 | ||
174 | packet.type = SR_DF_META; | |
175 | packet.payload = &meta; | |
176 | src = sr_config_new(SR_CONF_SAMPLERATE, g_variant_new_uint64(inc->samplerate)); | |
177 | meta.config = g_slist_append(NULL, src); | |
178 | sr_session_send(in->sdi, &packet); | |
179 | sr_config_free(src); | |
180 | ||
181 | return SR_OK; | |
182 | } | |
183 | ||
184 | static void send_chunk(const struct sr_input *in, int offset, int num_samples) | |
185 | { | |
186 | struct sr_datafeed_packet packet; | |
187 | struct sr_datafeed_analog analog; | |
188 | struct context *inc; | |
189 | float fdata[CHUNK_SIZE]; | |
190 | uint64_t sample; | |
191 | int total_samples, samplenum; | |
192 | char *s, *d; | |
193 | ||
194 | inc = in->priv; | |
195 | ||
196 | s = in->buf->str + offset; | |
197 | d = (char *)fdata; | |
198 | memset(fdata, 0, CHUNK_SIZE); | |
199 | total_samples = num_samples * inc->num_channels; | |
200 | for (samplenum = 0; samplenum < total_samples; samplenum++) { | |
201 | if (inc->fmt_code == WAVE_FORMAT_PCM) { | |
202 | sample = 0; | |
203 | memcpy(&sample, s, inc->unitsize); | |
204 | switch (inc->samplesize) { | |
205 | case 1: | |
206 | /* 8-bit PCM samples are unsigned. */ | |
207 | fdata[samplenum] = (uint8_t)sample / 255.0; | |
208 | break; | |
209 | case 2: | |
210 | fdata[samplenum] = GINT16_FROM_LE(sample) / 32767.0; | |
211 | break; | |
212 | case 4: | |
213 | fdata[samplenum] = GINT32_FROM_LE(sample) / 65535.0; | |
214 | break; | |
215 | } | |
216 | } else { | |
217 | /* BINARY32 float */ | |
218 | #ifdef WORDS_BIGENDIAN | |
219 | for (i = 0; i < inc->unitsize; i++) | |
220 | d[i] = s[inc->unitsize - i]; | |
221 | #else | |
222 | memcpy(d, s, inc->unitsize); | |
223 | #endif | |
224 | } | |
225 | s += inc->unitsize; | |
226 | d += inc->unitsize; | |
227 | } | |
228 | packet.type = SR_DF_ANALOG; | |
229 | packet.payload = &analog; | |
230 | analog.channels = in->sdi->channels; | |
231 | analog.num_samples = num_samples; | |
232 | analog.mq = 0; | |
233 | analog.mqflags = 0; | |
234 | analog.unit = 0; | |
235 | analog.data = fdata; | |
236 | sr_session_send(in->sdi, &packet); | |
237 | } | |
238 | ||
239 | static int receive(const struct sr_input *in, GString *buf) | |
240 | { | |
241 | struct context *inc; | |
242 | int offset, chunk_samples, total_samples, processed, max_chunk_samples, num_samples, i; | |
243 | ||
244 | g_string_append_len(in->buf, buf->str, buf->len); | |
245 | ||
246 | if (!in->priv) { | |
247 | if (initial_receive((struct sr_input *)in) != SR_OK) | |
248 | return SR_ERR; | |
249 | if (in->buf->len < MIN_DATA_CHUNK_OFFSET) { | |
250 | /* | |
251 | * Don't even get started until there's enough room | |
252 | * for the data segment to start. | |
253 | */ | |
254 | return SR_OK; | |
255 | } | |
256 | } | |
257 | inc = in->priv; | |
258 | ||
259 | if (!inc->found_data) { | |
260 | /* Skip past size of 'fmt ' chunk. */ | |
261 | i = 20 + GUINT32_FROM_LE(*(uint32_t *)(in->buf->str + 16)); | |
262 | offset = find_data_chunk(in->buf, i); | |
263 | if (offset < 0) { | |
264 | if (in->buf->len > MAX_DATA_CHUNK_OFFSET) { | |
265 | sr_err("Couldn't find data chunk."); | |
266 | return SR_ERR; | |
267 | } | |
268 | } | |
269 | inc->found_data = TRUE; | |
270 | } else | |
271 | offset = 0; | |
272 | ||
273 | /* Round off up to the last channels * unitsize boundary. */ | |
274 | chunk_samples = (in->buf->len - offset) / inc->num_channels / inc->unitsize; | |
275 | max_chunk_samples = CHUNK_SIZE / inc->num_channels / inc->unitsize; | |
276 | processed = 0; | |
277 | total_samples = chunk_samples; | |
278 | while (processed < total_samples) { | |
279 | if (chunk_samples > max_chunk_samples) | |
280 | num_samples = max_chunk_samples; | |
281 | else | |
282 | num_samples = chunk_samples; | |
283 | send_chunk(in, offset, num_samples); | |
284 | offset += num_samples * inc->unitsize; | |
285 | chunk_samples -= num_samples; | |
286 | processed += num_samples; | |
287 | } | |
288 | ||
289 | if ((unsigned int)offset < in->buf->len) { | |
290 | /* | |
291 | * The incoming buffer wasn't processed completely. Stash | |
292 | * the leftover data for next time. | |
293 | */ | |
294 | g_string_erase(in->buf, 0, offset); | |
295 | } else | |
296 | g_string_truncate(in->buf, 0); | |
297 | ||
298 | return SR_OK; | |
299 | } | |
300 | ||
301 | static int cleanup(struct sr_input *in) | |
302 | { | |
303 | struct sr_datafeed_packet packet; | |
304 | ||
305 | if (in->priv) { | |
306 | /* End of stream. */ | |
307 | packet.type = SR_DF_END; | |
308 | sr_session_send(in->sdi, &packet); | |
309 | ||
310 | g_free(in->priv); | |
311 | in->priv = NULL; | |
312 | } | |
313 | ||
314 | return SR_OK; | |
315 | } | |
316 | ||
317 | SR_PRIV struct sr_input_module input_wav = { | |
318 | .id = "wav", | |
319 | .name = "WAV", | |
320 | .desc = "WAV file", | |
321 | .metadata = { SR_INPUT_META_HEADER | SR_INPUT_META_REQUIRED }, | |
322 | .format_match = format_match, | |
323 | .init = init, | |
324 | .receive = receive, | |
325 | .cleanup = cleanup, | |
326 | }; | |
327 |