| 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 inline 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 |