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1 | #ifndef PCM_READER_H |
2 | #define PCM_READER_H |
3 | |
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4 | #include "lpcm.h" |
5 | |
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6 | typedef struct pcm_reader_t pcm_reader_t; |
7 | |
8 | typedef struct pcm_reader_vtbl_t { |
9 | const pcm_sample_description_t *(*get_format)(pcm_reader_t *); |
10 | int64_t (*get_length)(pcm_reader_t *); |
11 | int64_t (*get_position)(pcm_reader_t *); |
12 | int (*read_frames)(pcm_reader_t *, void *, unsigned); |
13 | void (*teardown)(pcm_reader_t **); |
14 | } pcm_reader_vtbl_t; |
15 | |
16 | struct pcm_reader_t { |
17 | pcm_reader_vtbl_t *vtbl; |
18 | }; |
19 | |
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20 | typedef int (*pcm_read_callback)(void *cookie, void *data, uint32_t count); |
21 | typedef int (*pcm_seek_callback)(void *cookie, int64_t off, int whence); |
22 | typedef int64_t (*pcm_tell_callback)(void *cookie); |
23 | |
24 | typedef struct pcm_io_vtbl_t { |
25 | pcm_read_callback read; |
26 | pcm_seek_callback seek; |
27 | pcm_tell_callback tell; |
28 | } pcm_io_vtbl_t; |
29 | |
30 | typedef struct pcm_io_context_t { |
31 | pcm_io_vtbl_t *vtbl; |
32 | void *cookie; |
33 | } pcm_io_context_t; |
34 | |
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35 | static inline |
36 | const pcm_sample_description_t *pcm_get_format(pcm_reader_t *r) |
37 | { |
38 | return r->vtbl->get_format(r); |
39 | } |
40 | |
41 | static inline |
42 | int64_t pcm_get_length(pcm_reader_t *r) |
43 | { |
44 | return r->vtbl->get_length(r); |
45 | } |
46 | |
47 | static inline |
48 | int64_t pcm_get_position(pcm_reader_t *r) |
49 | { |
50 | return r->vtbl->get_position(r); |
51 | } |
52 | |
53 | static inline |
54 | int64_t pcm_read_frames(pcm_reader_t *r, void *data, unsigned nframes) |
55 | { |
56 | return r->vtbl->read_frames(r, data, nframes); |
57 | } |
58 | |
59 | static inline |
60 | void pcm_teardown(pcm_reader_t **r) |
61 | { |
62 | (*r)->vtbl->teardown(r); |
63 | } |
64 | |
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65 | static inline |
66 | uint32_t bitcount(uint32_t bits) |
67 | { |
68 | bits = (bits & 0x55555555) + (bits >> 1 & 0x55555555); |
69 | bits = (bits & 0x33333333) + (bits >> 2 & 0x33333333); |
70 | bits = (bits & 0x0f0f0f0f) + (bits >> 4 & 0x0f0f0f0f); |
71 | bits = (bits & 0x00ff00ff) + (bits >> 8 & 0x00ff00ff); |
72 | return (bits & 0x0000ffff) + (bits >>16 & 0x0000ffff); |
73 | } |
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74 | |
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75 | #define TRY_IO(expr) \ |
76 | do { \ |
77 | if ((expr)) goto FAIL; \ |
78 | } while (0) |
79 | |
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80 | #define ENSURE(expr) \ |
81 | do { \ |
82 | if (!(expr)) goto FAIL;\ |
83 | } while (0) |
84 | |
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85 | int pcm_read(pcm_io_context_t *io, void *buffer, uint32_t size); |
86 | int pcm_skip(pcm_io_context_t *io, int64_t count); |
87 | |
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88 | static inline int pcm_seek(pcm_io_context_t *io, int64_t off, int whence) |
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89 | { |
90 | return io->vtbl->seek ? io->vtbl->seek(io->cookie, off, whence) : -1; |
91 | } |
92 | |
93 | static inline int64_t pcm_tell(pcm_io_context_t *io) |
94 | { |
95 | return io->vtbl->tell ? io->vtbl->tell(io->cookie) : -1; |
96 | } |
97 | |
98 | int pcm_read16le(pcm_io_context_t *io, uint16_t *value); |
99 | int pcm_read16be(pcm_io_context_t *io, uint16_t *value); |
100 | int pcm_read32le(pcm_io_context_t *io, uint32_t *value); |
101 | int pcm_read32be(pcm_io_context_t *io, uint32_t *value); |
102 | int pcm_read64le(pcm_io_context_t *io, uint64_t *value); |
103 | int pcm_read64be(pcm_io_context_t *io, uint64_t *value); |
104 | int pcm_scanl(pcm_io_context_t *io, const char *fmt, ...); |
105 | int pcm_scanb(pcm_io_context_t *io, const char *fmt, ...); |
106 | |
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107 | int apple_chan_chunk(pcm_io_context_t *io, uint32_t chunk_size, |
108 | pcm_sample_description_t *fmt, uint8_t *mapping); |
109 | |
110 | pcm_reader_t *pcm_open_sint16_converter(pcm_reader_t *reader); |
111 | |
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112 | #endif |