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1 | #ifndef PCM_READER_H | |
2 | #define PCM_READER_H | |
3 | ||
4 | #include "lpcm.h" | |
5 | ||
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 | ||
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 | ||
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 | ||
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 | } | |
74 | ||
75 | #define TRY_IO(expr) \ | |
76 | do { \ | |
77 | if ((expr)) goto FAIL; \ | |
78 | } while (0) | |
79 | ||
80 | #define ENSURE(expr) \ | |
81 | do { \ | |
82 | if (!(expr)) goto FAIL;\ | |
83 | } while (0) | |
84 | ||
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 | ||
88 | static int pcm_seek(pcm_io_context_t *io, int64_t off, int whence) | |
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 | ||
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 | ||
112 | #endif |