src/pcm_reader.h

   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