src/pcm_reader.h

   1 /*
   2  * Copyright (C) 2013 nu774
   3  * For conditions of distribution and use, see copyright notice in COPYING
   4  */
   5 #ifndef PCM_READER_H
   6 #define PCM_READER_H
   7
   8 #include "lpcm.h"
   9
  10 typedef struct pcm_reader_t pcm_reader_t;
  11
  12 typedef struct pcm_reader_vtbl_t {
  13     const pcm_sample_description_t *(*get_format)(pcm_reader_t *);
  14     int64_t (*get_length)(pcm_reader_t *);
  15     int64_t (*get_position)(pcm_reader_t *);
  16     int (*read_frames)(pcm_reader_t *, void *, unsigned);
  17     void (*teardown)(pcm_reader_t **);
  18 } pcm_reader_vtbl_t;
  19
  20 struct pcm_reader_t {
  21     pcm_reader_vtbl_t *vtbl;
  22 };
  23
  24 typedef int (*pcm_read_callback)(void *cookie, void *data, uint32_t count);
  25 typedef int (*pcm_seek_callback)(void *cookie, int64_t off, int whence);
  26 typedef int64_t (*pcm_tell_callback)(void *cookie);
  27
  28 typedef struct pcm_io_vtbl_t {
  29     pcm_read_callback read;
  30     pcm_seek_callback seek;
  31     pcm_tell_callback tell;
  32 } pcm_io_vtbl_t;
  33
  34 typedef struct pcm_io_context_t {
  35     pcm_io_vtbl_t *vtbl;
  36     void *cookie;
  37 } pcm_io_context_t;
  38
  39 static inline
  40 const pcm_sample_description_t *pcm_get_format(pcm_reader_t *r)
  41 {
  42     return r->vtbl->get_format(r);
  43 }
  44
  45 static inline
  46 int64_t pcm_get_length(pcm_reader_t *r)
  47 {
  48     return r->vtbl->get_length(r);
  49 }
  50
  51 static inline
  52 int64_t pcm_get_position(pcm_reader_t *r)
  53 {
  54     return r->vtbl->get_position(r);
  55 }
  56
  57 static inline
  58 int64_t pcm_read_frames(pcm_reader_t *r, void *data, unsigned nframes)
  59 {
  60     return r->vtbl->read_frames(r, data, nframes);
  61 }
  62
  63 static inline
  64 void pcm_teardown(pcm_reader_t **r)
  65 {
  66     (*r)->vtbl->teardown(r);
  67 }
  68
  69 static inline
  70 uint32_t bitcount(uint32_t bits)
  71 {
  72     bits = (bits & 0x55555555) + (bits >> 1 & 0x55555555);
  73     bits = (bits & 0x33333333) + (bits >> 2 & 0x33333333);
  74     bits = (bits & 0x0f0f0f0f) + (bits >> 4 & 0x0f0f0f0f);
  75     bits = (bits & 0x00ff00ff) + (bits >> 8 & 0x00ff00ff);
  76     return (bits & 0x0000ffff) + (bits >>16 & 0x0000ffff);
  77 }
  78
  79 #define TRY_IO(expr) \
  80     do { \
  81         if ((expr)) goto FAIL; \
  82     } while (0)
  83
  84 #define ENSURE(expr) \
  85     do { \
  86         if (!(expr)) goto FAIL;\
  87     } while (0)
  88
  89 int pcm_read(pcm_io_context_t *io, void *buffer, uint32_t size);
  90 int pcm_skip(pcm_io_context_t *io, int64_t count);
  91
  92 static inline int pcm_seek(pcm_io_context_t *io, int64_t off, int whence)
  93 {
  94     return io->vtbl->seek ? io->vtbl->seek(io->cookie, off, whence) : -1;
  95 }
  96
  97 static inline int64_t pcm_tell(pcm_io_context_t *io)
  98 {
  99     return io->vtbl->tell ? io->vtbl->tell(io->cookie) : -1;
 100 }
 101
 102 int pcm_read16le(pcm_io_context_t *io, uint16_t *value);
 103 int pcm_read16be(pcm_io_context_t *io, uint16_t *value);
 104 int pcm_read32le(pcm_io_context_t *io, uint32_t *value);
 105 int pcm_read32be(pcm_io_context_t *io, uint32_t *value);
 106 int pcm_read64le(pcm_io_context_t *io, uint64_t *value);
 107 int pcm_read64be(pcm_io_context_t *io, uint64_t *value);
 108 int pcm_scanl(pcm_io_context_t *io, const char *fmt, ...);
 109 int pcm_scanb(pcm_io_context_t *io, const char *fmt, ...);
 110
 111 int apple_chan_chunk(pcm_io_context_t *io, uint32_t chunk_size,
 112                      pcm_sample_description_t *fmt, uint8_t *mapping);
 113
 114 pcm_reader_t *pcm_open_sint16_converter(pcm_reader_t *reader);
 115
 116 pcm_reader_t *extrapolater_open(pcm_reader_t *reader);
 117
 118 #endif