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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> | |
a7e00a42 | 17 | #include "pcm_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 | } |