summaryrefslogtreecommitdiff
path: root/src/read-wav.c
blob: 0d3a62d9c2b6ec97db069183232339719ea9e1f9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
/*-*- Mode: C; c-basic-offset: 8 -*-*/

/***
  This file is part of libcanberra.

  Copyright 2008 Lennart Poettering

  libcanberra is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation, either version 2.1 of the
  License, or (at your option) any later version.

  libcanberra is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with libcanberra. If not, see
  <http://www.gnu.org/licenses/>.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "canberra.h"
#include "read-wav.h"
#include "macro.h"
#include "malloc.h"

#define FILE_SIZE_MAX (64U*1024U*1024U)

/* Stores the bit indexes in dwChannelMask */
enum {
        BIT_FRONT_LEFT,
        BIT_FRONT_RIGHT,
        BIT_FRONT_CENTER,
        BIT_LOW_FREQUENCY,
        BIT_BACK_LEFT,
        BIT_BACK_RIGHT,
        BIT_FRONT_LEFT_OF_CENTER,
        BIT_FRONT_RIGHT_OF_CENTER,
        BIT_BACK_CENTER,
        BIT_SIDE_LEFT,
        BIT_SIDE_RIGHT,
        BIT_TOP_CENTER,
        BIT_TOP_FRONT_LEFT,
        BIT_TOP_FRONT_CENTER,
        BIT_TOP_FRONT_RIGHT,
        BIT_TOP_BACK_LEFT,
        BIT_TOP_BACK_CENTER,
        BIT_TOP_BACK_RIGHT,
        _BIT_MAX
};

static const ca_channel_position_t channel_table[_BIT_MAX] = {
        [BIT_FRONT_LEFT] = CA_CHANNEL_FRONT_LEFT,
        [BIT_FRONT_RIGHT] = CA_CHANNEL_FRONT_RIGHT,
        [BIT_FRONT_CENTER] = CA_CHANNEL_FRONT_CENTER,
        [BIT_LOW_FREQUENCY] = CA_CHANNEL_LFE,
        [BIT_BACK_LEFT] = CA_CHANNEL_REAR_LEFT,
        [BIT_BACK_RIGHT] = CA_CHANNEL_REAR_RIGHT,
        [BIT_FRONT_LEFT_OF_CENTER] = CA_CHANNEL_FRONT_LEFT_OF_CENTER,
        [BIT_FRONT_RIGHT_OF_CENTER] = CA_CHANNEL_FRONT_RIGHT_OF_CENTER,
        [BIT_BACK_CENTER] = CA_CHANNEL_REAR_CENTER,
        [BIT_SIDE_LEFT] = CA_CHANNEL_SIDE_LEFT,
        [BIT_SIDE_RIGHT] = CA_CHANNEL_SIDE_RIGHT,
        [BIT_TOP_CENTER] = CA_CHANNEL_TOP_CENTER,
        [BIT_TOP_FRONT_LEFT] = CA_CHANNEL_TOP_FRONT_LEFT,
        [BIT_TOP_FRONT_CENTER] = CA_CHANNEL_TOP_FRONT_CENTER,
        [BIT_TOP_FRONT_RIGHT] = CA_CHANNEL_TOP_FRONT_RIGHT,
        [BIT_TOP_BACK_LEFT] = CA_CHANNEL_TOP_REAR_LEFT,
        [BIT_TOP_BACK_CENTER] = CA_CHANNEL_TOP_REAR_CENTER,
        [BIT_TOP_BACK_RIGHT] = CA_CHANNEL_TOP_REAR_RIGHT
};

struct ca_wav {
        FILE *file;

        off_t data_size;
        unsigned nchannels;
        unsigned rate;
        unsigned depth;
        uint32_t channel_mask;

        ca_channel_position_t channel_map[_BIT_MAX];
};

#define CHUNK_ID_DATA 0x61746164U
#define CHUNK_ID_FMT 0x20746d66U

static const uint8_t pcm_guid[16] = {
        0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
        0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71
};

static int skip_to_chunk(ca_wav *w, uint32_t id, uint32_t *size) {

        ca_return_val_if_fail(w, CA_ERROR_INVALID);
        ca_return_val_if_fail(size, CA_ERROR_INVALID);

        for (;;) {
                uint32_t chunk[2];
                uint32_t s;

                if (fread(chunk, sizeof(uint32_t), CA_ELEMENTSOF(chunk), w->file) != CA_ELEMENTSOF(chunk))
                        goto fail_io;

                s = CA_UINT32_FROM_LE(chunk[1]);

                if (s <= 0 || s >= FILE_SIZE_MAX)
                        return CA_ERROR_TOOBIG;

                if (CA_UINT32_FROM_LE(chunk[0]) == id) {
                        *size = s;
                        break;
                }

                if (fseek(w->file, (long) s, SEEK_CUR) < 0)
                        return CA_ERROR_SYSTEM;
        }

        return CA_SUCCESS;

fail_io:

        if (feof(w->file))
                return CA_ERROR_CORRUPT;
        else if (ferror(w->file))
                return CA_ERROR_SYSTEM;

        ca_assert_not_reached();
}

int ca_wav_open(ca_wav **_w, FILE *f)  {
        uint32_t header[3], fmt_chunk[10];
        int ret;
        ca_wav *w;
        uint32_t file_size, fmt_size, data_size;
        ca_bool_t extensible;
        uint32_t format;

        ca_return_val_if_fail(_w, CA_ERROR_INVALID);
        ca_return_val_if_fail(f, CA_ERROR_INVALID);

        if (!(w = ca_new(ca_wav, 1)))
                return CA_ERROR_OOM;

        w->file = f;

        if (fread(header, sizeof(uint32_t), CA_ELEMENTSOF(header), f) != CA_ELEMENTSOF(header))
                goto fail_io;

        if (CA_UINT32_FROM_LE(header[0]) != 0x46464952U ||
            CA_UINT32_FROM_LE(header[2]) != 0x45564157U) {
                ret = CA_ERROR_CORRUPT;
                goto fail;
        }

        file_size = CA_UINT32_FROM_LE(header[1]);

        if (file_size <= 0 || file_size >= FILE_SIZE_MAX) {
                ret = CA_ERROR_TOOBIG;
                goto fail;
        }

        /* Skip to the fmt chunk */
        if ((ret = skip_to_chunk(w, CHUNK_ID_FMT, &fmt_size)) < 0)
                goto fail;

        switch (fmt_size) {

        case 14: /* WAVEFORMAT */
        case 16:
        case 18: /* WAVEFORMATEX */
                extensible = FALSE;
                break;

        case 40: /* WAVEFORMATEXTENSIBLE */
                extensible = TRUE;
                break;

        default:
                ret = CA_ERROR_NOTSUPPORTED;
                goto fail;
        }

        if (fread(fmt_chunk, 1, fmt_size, f) != fmt_size)
                goto fail_io;

        /* PCM? or WAVEX? */
        format = (CA_UINT32_FROM_LE(fmt_chunk[0]) & 0xFFFF);
        if ((!extensible && format != 0x0001) ||
            (extensible && format != 0xFFFE)) {
                ret = CA_ERROR_NOTSUPPORTED;
                goto fail;
        }

        if (extensible) {
                if (memcmp(fmt_chunk + 6, pcm_guid, 16) != 0) {
                        ret = CA_ERROR_NOTSUPPORTED;
                        goto fail;
                }

                w->channel_mask = CA_UINT32_FROM_LE(fmt_chunk[5]);
        } else
                w->channel_mask = 0;

        w->nchannels = CA_UINT32_FROM_LE(fmt_chunk[0]) >> 16;
        w->rate = CA_UINT32_FROM_LE(fmt_chunk[1]);
        w->depth = CA_UINT32_FROM_LE(fmt_chunk[3]) >> 16;

        if (w->nchannels <= 0 || w->rate <= 0) {
                ret = CA_ERROR_CORRUPT;
                goto fail;
        }

        if (w->depth != 16 && w->depth != 8) {
                ret = CA_ERROR_NOTSUPPORTED;
                goto fail;
        }

        /* Skip to the data chunk */
        if ((ret = skip_to_chunk(w, CHUNK_ID_DATA, &data_size)) < 0)
                goto fail;
        w->data_size = (off_t) data_size;

        if ((w->data_size % (w->depth/8)) != 0) {
                ret = CA_ERROR_CORRUPT;
                goto fail;
        }

        *_w = w;

        return CA_SUCCESS;

fail_io:

        if (feof(f))
                ret = CA_ERROR_CORRUPT;
        else if (ferror(f))
                ret = CA_ERROR_SYSTEM;
        else
                ca_assert_not_reached();

fail:

        ca_free(w);

        return ret;
}

void ca_wav_close(ca_wav *w) {
        ca_assert(w);

        fclose(w->file);
        ca_free(w);
}

unsigned ca_wav_get_nchannels(ca_wav *w) {
        ca_assert(w);

        return w->nchannels;
}

unsigned ca_wav_get_rate(ca_wav *w) {
        ca_assert(w);

        return w->rate;
}

const ca_channel_position_t* ca_wav_get_channel_map(ca_wav *w) {
        unsigned c;
        ca_channel_position_t *p;

        ca_assert(w);

        if (!w->channel_mask)
                return NULL;

        p = w->channel_map;

        for (c = 0; c < _BIT_MAX; c++)
                if ((w->channel_mask & (1 << c)))
                        *(p++) = channel_table[c];

        ca_assert(p <= w->channel_map + _BIT_MAX);

        if (p != w->channel_map + w->nchannels)
                return NULL;

        return w->channel_map;
}

ca_sample_type_t ca_wav_get_sample_type(ca_wav *w) {
        ca_assert(w);

        return w->depth == 16 ?
#ifdef WORDS_BIGENDIAN
                CA_SAMPLE_S16RE
#else
                CA_SAMPLE_S16NE
#endif
                : CA_SAMPLE_U8;
}

int ca_wav_read_s16le(ca_wav *w, int16_t *d, size_t *n) {
        off_t remaining;

        ca_return_val_if_fail(w, CA_ERROR_INVALID);
        ca_return_val_if_fail(w->depth == 16, CA_ERROR_INVALID);
        ca_return_val_if_fail(d, CA_ERROR_INVALID);
        ca_return_val_if_fail(n, CA_ERROR_INVALID);
        ca_return_val_if_fail(*n > 0, CA_ERROR_INVALID);

        remaining = w->data_size / (off_t) sizeof(int16_t);

        if ((off_t) *n > remaining)
                *n = (size_t) remaining;

        if (*n > 0) {
                *n = fread(d, sizeof(int16_t), *n, w->file);

                if (*n <= 0 && ferror(w->file))
                        return CA_ERROR_SYSTEM;

                ca_assert(w->data_size >= (off_t) *n * (off_t) sizeof(int16_t));
                w->data_size -= (off_t) *n * (off_t) sizeof(int16_t);
        }

        return CA_SUCCESS;
}

int ca_wav_read_u8(ca_wav *w, uint8_t *d, size_t *n) {
        off_t remaining;

        ca_return_val_if_fail(w, CA_ERROR_INVALID);
        ca_return_val_if_fail(w->depth == 8, CA_ERROR_INVALID);
        ca_return_val_if_fail(d, CA_ERROR_INVALID);
        ca_return_val_if_fail(n, CA_ERROR_INVALID);
        ca_return_val_if_fail(*n > 0, CA_ERROR_INVALID);

        remaining = w->data_size / (off_t) sizeof(uint8_t);

        if ((off_t) *n > remaining)
                *n = (size_t) remaining;

        if (*n > 0) {
                *n = fread(d, sizeof(uint8_t), *n, w->file);

                if (*n <= 0 && ferror(w->file))
                        return CA_ERROR_SYSTEM;

                ca_assert(w->data_size >= (off_t) *n * (off_t) sizeof(uint8_t));
                w->data_size -= (off_t) *n * (off_t) sizeof(uint8_t);
        }

        return CA_SUCCESS;
}

off_t ca_wav_get_size(ca_wav *v) {
        ca_return_val_if_fail(v, (off_t) -1);

        return v->data_size;
}