48e2f01c |
1 | /* |
2 | * Copyright (C) 2013 nu774 |
3 | * For conditions of distribution and use, see copyright notice in COPYING |
4 | */ |
5 | #if HAVE_CONFIG_H |
6 | # include "config.h" |
7 | #endif |
8 | |
9 | #if HAVE_STDINT_H |
10 | # include <stdint.h> |
11 | #endif |
12 | |
13 | #include <stdio.h> |
14 | #include <stdlib.h> |
15 | #include <string.h> |
16 | #include <stdarg.h> |
17 | #include "wav_reader.h" |
48e2f01c |
18 | |
19 | #define RIFF_FOURCC(a,b,c,d) ((a)|((b)<<8)|((c)<<16)|((d)<<24)) |
20 | |
1af8624b |
21 | typedef struct wav_reader_t { |
2d744bd5 |
22 | pcm_reader_vtbl_t *vtbl; |
48e2f01c |
23 | pcm_sample_description_t sample_format; |
24 | int64_t length; |
25 | int64_t position; |
68879398 |
26 | int32_t data_offset; |
48e2f01c |
27 | int ignore_length; |
29a8f73f |
28 | pcm_io_context_t io; |
1af8624b |
29 | } wav_reader_t; |
48e2f01c |
30 | |
31 | static const uint8_t WAV_GUID_PCM[] = { |
32 | 1, 0, 0, 0, 0, 0, 0x10, 0, 0x80, 0, 0, 0xaa, 0, 0x38, 0x9b, 0x71 |
33 | }; |
34 | static const uint8_t WAV_GUID_FLOAT[] = { |
35 | 3, 0, 0, 0, 0, 0, 0x10, 0, 0x80, 0, 0, 0xaa, 0, 0x38, 0x9b, 0x71 |
36 | }; |
37 | |
2d744bd5 |
38 | static const pcm_sample_description_t *wav_get_format(pcm_reader_t *reader) |
48e2f01c |
39 | { |
2d744bd5 |
40 | return &((wav_reader_t *)reader)->sample_format; |
48e2f01c |
41 | } |
42 | |
2d744bd5 |
43 | static int64_t wav_get_length(pcm_reader_t *reader) |
48e2f01c |
44 | { |
2d744bd5 |
45 | return ((wav_reader_t *)reader)->length; |
48e2f01c |
46 | } |
47 | |
2d744bd5 |
48 | static int64_t wav_get_position(pcm_reader_t *reader) |
48e2f01c |
49 | { |
2d744bd5 |
50 | return ((wav_reader_t *)reader)->position; |
48e2f01c |
51 | } |
52 | |
2d744bd5 |
53 | static void wav_teardown(pcm_reader_t **reader) |
48e2f01c |
54 | { |
55 | free(*reader); |
56 | *reader = 0; |
57 | } |
58 | |
48e2f01c |
59 | static |
60 | uint32_t riff_next_chunk(wav_reader_t *reader, uint32_t *chunk_size) |
61 | { |
62 | uint32_t fcc; |
29a8f73f |
63 | return (pcm_scanl(&reader->io, "LL", &fcc, chunk_size) == 2) ? fcc : 0; |
48e2f01c |
64 | } |
65 | |
2d744bd5 |
66 | static |
67 | int wav_read_frames(pcm_reader_t *preader, void *buffer, unsigned nframes) |
48e2f01c |
68 | { |
69 | int rc; |
70 | unsigned nbytes; |
2d744bd5 |
71 | wav_reader_t *reader = (wav_reader_t *)preader; |
48e2f01c |
72 | |
73 | if (!reader->ignore_length && nframes > reader->length - reader->position) |
74 | nframes = reader->length - reader->position; |
75 | nbytes = nframes * reader->sample_format.bytes_per_frame; |
76 | if (nbytes) { |
29a8f73f |
77 | if ((rc = pcm_read(&reader->io, buffer, nbytes)) < 0) |
48e2f01c |
78 | return -1; |
79 | nframes = rc / reader->sample_format.bytes_per_frame; |
80 | reader->position += nframes; |
81 | } |
82 | return nframes; |
83 | } |
84 | |
85 | static |
86 | int riff_ds64(wav_reader_t *reader, int64_t *length) |
87 | { |
88 | uint32_t fcc, chunk_size, table_size; |
89 | uint64_t riff_size, sample_count; |
90 | |
91 | fcc = riff_next_chunk(reader, &chunk_size); |
29a8f73f |
92 | ENSURE(fcc == RIFF_FOURCC('d','s','6','4') && chunk_size >= 28); |
93 | TRY_IO(pcm_scanl(&reader->io, "QQQL", |
48e2f01c |
94 | &riff_size, length, &sample_count, &table_size) != 4); |
29a8f73f |
95 | TRY_IO(pcm_skip(&reader->io, (chunk_size - 27) & ~1)); |
48e2f01c |
96 | FAIL: |
97 | return -1; |
98 | } |
99 | |
100 | static |
101 | int wav_fmt(wav_reader_t *reader, uint32_t size) |
102 | { |
103 | uint16_t wFormatTag, nChannels, nBlockAlign, wBitsPerSample, cbSize; |
104 | uint32_t nSamplesPerSec, nAvgBytesPerSec, dwChannelMask = 0; |
105 | uint16_t wValidBitsPerSample; |
106 | uint8_t guid[16]; |
107 | int is_float = 0; |
108 | |
29a8f73f |
109 | ENSURE(size >= 16); |
110 | TRY_IO(pcm_scanl(&reader->io, "SSLLSS", &wFormatTag, &nChannels, |
48e2f01c |
111 | &nSamplesPerSec, &nAvgBytesPerSec, &nBlockAlign, |
112 | &wBitsPerSample) != 6); |
113 | wValidBitsPerSample = wBitsPerSample; |
114 | |
29a8f73f |
115 | ENSURE(wFormatTag == 1 || wFormatTag == 3 || wFormatTag == 0xfffe); |
116 | ENSURE(nChannels && nSamplesPerSec && nAvgBytesPerSec && |
117 | nBlockAlign && wBitsPerSample && !(wBitsPerSample & 7) && |
118 | nBlockAlign == nChannels * wBitsPerSample / 8); |
119 | |
48e2f01c |
120 | if (wFormatTag == 3) |
121 | is_float = 1; |
122 | |
123 | if (wFormatTag != 0xfffe) |
29a8f73f |
124 | TRY_IO(pcm_skip(&reader->io, (size - 15) & ~1)); |
48e2f01c |
125 | else { |
29a8f73f |
126 | ENSURE(size >= 40); |
127 | TRY_IO(pcm_scanl(&reader->io, "SSL", |
48e2f01c |
128 | &cbSize, &wValidBitsPerSample, &dwChannelMask) != 3); |
29a8f73f |
129 | TRY_IO(pcm_read(&reader->io, guid, 16) != 16); |
48e2f01c |
130 | |
131 | if (memcmp(guid, WAV_GUID_FLOAT, 16) == 0) |
132 | is_float = 1; |
29a8f73f |
133 | else if (memcmp(guid, WAV_GUID_PCM, 16) != 0) |
48e2f01c |
134 | goto FAIL; |
29a8f73f |
135 | ENSURE(wValidBitsPerSample && wValidBitsPerSample <= wBitsPerSample); |
136 | TRY_IO(pcm_skip(&reader->io, (size - 39) & ~1)); |
48e2f01c |
137 | } |
138 | reader->sample_format.sample_rate = nSamplesPerSec; |
139 | reader->sample_format.bits_per_channel = wValidBitsPerSample; |
140 | reader->sample_format.bytes_per_frame = nBlockAlign; |
141 | reader->sample_format.channels_per_frame = nChannels; |
142 | reader->sample_format.channel_mask = dwChannelMask; |
143 | if (is_float) |
144 | reader->sample_format.sample_type = PCM_TYPE_FLOAT; |
145 | else if (wBitsPerSample == 8) |
146 | reader->sample_format.sample_type = PCM_TYPE_UINT; |
147 | else |
148 | reader->sample_format.sample_type = PCM_TYPE_SINT; |
149 | return 0; |
150 | FAIL: |
151 | return -1; |
152 | } |
153 | |
154 | static |
155 | int wav_parse(wav_reader_t *reader, int64_t *data_length) |
156 | { |
157 | uint32_t container, fcc, chunk_size; |
158 | |
159 | *data_length = 0; |
160 | container = riff_next_chunk(reader, &chunk_size); |
29a8f73f |
161 | ENSURE(container == RIFF_FOURCC('R','I','F','F') || |
162 | container == RIFF_FOURCC('R','F','6','4')); |
163 | TRY_IO(pcm_read32le(&reader->io, &fcc)); |
164 | ENSURE(fcc == RIFF_FOURCC('W','A','V','E')); |
68879398 |
165 | |
48e2f01c |
166 | if (container == RIFF_FOURCC('R','F','6','4')) |
167 | riff_ds64(reader, data_length); |
168 | while ((fcc = riff_next_chunk(reader, &chunk_size)) != 0) { |
169 | if (fcc == RIFF_FOURCC('f','m','t',' ')) { |
170 | if (wav_fmt(reader, chunk_size) < 0) |
171 | goto FAIL; |
172 | } else if (fcc == RIFF_FOURCC('d','a','t','a')) { |
173 | if (container == RIFF_FOURCC('R','I','F','F')) |
174 | *data_length = chunk_size; |
3de0e22d |
175 | reader->data_offset = pcm_tell(&reader->io); |
48e2f01c |
176 | break; |
68879398 |
177 | } else { |
29a8f73f |
178 | TRY_IO(pcm_skip(&reader->io, (chunk_size + 1) & ~1)); |
68879398 |
179 | } |
48e2f01c |
180 | } |
181 | if (fcc == RIFF_FOURCC('d','a','t','a')) |
182 | return 0; |
183 | FAIL: |
184 | return -1; |
185 | } |
186 | |
2d744bd5 |
187 | static pcm_reader_vtbl_t wav_vtable = { |
188 | wav_get_format, |
189 | wav_get_length, |
190 | wav_get_position, |
191 | wav_read_frames, |
192 | wav_teardown |
193 | }; |
194 | |
29a8f73f |
195 | pcm_reader_t *wav_open(pcm_io_context_t *io, int ignore_length) |
48e2f01c |
196 | { |
68879398 |
197 | wav_reader_t *reader = 0; |
48e2f01c |
198 | int64_t data_length; |
68879398 |
199 | unsigned bpf; |
48e2f01c |
200 | |
201 | if ((reader = calloc(1, sizeof(wav_reader_t))) == 0) |
202 | return 0; |
29a8f73f |
203 | memcpy(&reader->io, io, sizeof(pcm_io_context_t)); |
48e2f01c |
204 | reader->ignore_length = ignore_length; |
205 | if (wav_parse(reader, &data_length) < 0) { |
206 | free(reader); |
207 | return 0; |
208 | } |
68879398 |
209 | bpf = reader->sample_format.bytes_per_frame; |
210 | if (ignore_length || !data_length || data_length % bpf) |
48e2f01c |
211 | reader->length = INT64_MAX; |
212 | else |
68879398 |
213 | reader->length = data_length / bpf; |
214 | |
29a8f73f |
215 | if (reader->length == INT64_MAX) { |
216 | if (pcm_seek(&reader->io, 0, SEEK_END) >= 0) { |
217 | int64_t size = pcm_tell(&reader->io); |
68879398 |
218 | if (size > 0) |
219 | reader->length = (size - reader->data_offset) / bpf; |
29a8f73f |
220 | pcm_seek(&reader->io, reader->data_offset, SEEK_SET); |
68879398 |
221 | } |
222 | } |
2d744bd5 |
223 | reader->vtbl = &wav_vtable; |
224 | return (pcm_reader_t *)reader; |
48e2f01c |
225 | } |
68543176 |
226 | |
29a8f73f |
227 | pcm_reader_t *raw_open(pcm_io_context_t *io, |
68543176 |
228 | const pcm_sample_description_t *desc) |
229 | { |
230 | wav_reader_t *reader = 0; |
231 | |
232 | if ((reader = calloc(1, sizeof(wav_reader_t))) == 0) |
233 | return 0; |
29a8f73f |
234 | memcpy(&reader->io, io, sizeof(pcm_io_context_t)); |
68543176 |
235 | memcpy(&reader->sample_format, desc, sizeof(pcm_sample_description_t)); |
29a8f73f |
236 | if (pcm_seek(&reader->io, 0, SEEK_END) >= 0) { |
237 | int64_t size = pcm_tell(&reader->io); |
238 | if (size > 0) |
239 | reader->length = size / reader->sample_format.bytes_per_frame; |
240 | pcm_seek(&reader->io, 0, SEEK_SET); |
68543176 |
241 | } else |
242 | reader->length = INT64_MAX; |
2d744bd5 |
243 | reader->vtbl = &wav_vtable; |
244 | return (pcm_reader_t *)reader; |
68543176 |
245 | } |