+static inline
+uint32_t bitcount(uint32_t bits)
+{
+ bits = (bits & 0x55555555) + (bits >> 1 & 0x55555555);
+ bits = (bits & 0x33333333) + (bits >> 2 & 0x33333333);
+ bits = (bits & 0x0f0f0f0f) + (bits >> 4 & 0x0f0f0f0f);
+ bits = (bits & 0x00ff00ff) + (bits >> 8 & 0x00ff00ff);
+ return (bits & 0x0000ffff) + (bits >>16 & 0x0000ffff);
+}
+
+#define TRY_IO(expr) \
+ do { \
+ if ((expr)) goto FAIL; \
+ } while (0)
+
+#define ENSURE(expr) \
+ do { \
+ if (!(expr)) goto FAIL;\
+ } while (0)
+
+int pcm_read(pcm_io_context_t *io, void *buffer, uint32_t size);
+int pcm_skip(pcm_io_context_t *io, int64_t count);
+
+static inline int pcm_seek(pcm_io_context_t *io, int64_t off, int whence)
+{
+ return io->vtbl->seek ? io->vtbl->seek(io->cookie, off, whence) : -1;
+}
+
+static inline int64_t pcm_tell(pcm_io_context_t *io)
+{
+ return io->vtbl->tell ? io->vtbl->tell(io->cookie) : -1;
+}
+
+int pcm_read16le(pcm_io_context_t *io, uint16_t *value);
+int pcm_read16be(pcm_io_context_t *io, uint16_t *value);
+int pcm_read32le(pcm_io_context_t *io, uint32_t *value);
+int pcm_read32be(pcm_io_context_t *io, uint32_t *value);
+int pcm_read64le(pcm_io_context_t *io, uint64_t *value);
+int pcm_read64be(pcm_io_context_t *io, uint64_t *value);
+int pcm_scanl(pcm_io_context_t *io, const char *fmt, ...);
+int pcm_scanb(pcm_io_context_t *io, const char *fmt, ...);
+
+int apple_chan_chunk(pcm_io_context_t *io, uint32_t chunk_size,
+ pcm_sample_description_t *fmt, uint8_t *mapping);
+
+pcm_reader_t *pcm_open_sint16_converter(pcm_reader_t *reader);
+
+pcm_reader_t *extrapolater_open(pcm_reader_t *reader);
+