+#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 *wav_open(pcm_io_context_t *io, int ignore_length);
+pcm_reader_t *raw_open(pcm_io_context_t *io,
+ const pcm_sample_description_t *desc);
+pcm_reader_t *caf_open(pcm_io_context_t *io,
+ aacenc_tag_callback_t tag_callback, void *tag_ctx);
+
+pcm_reader_t *pcm_open_native_converter(pcm_reader_t *reader);
+pcm_reader_t *pcm_open_float_converter(pcm_reader_t *reader);
+pcm_reader_t *pcm_open_sint16_converter(pcm_reader_t *reader);
+
+pcm_reader_t *extrapolater_open(pcm_reader_t *reader);
+pcm_reader_t *limiter_open(pcm_reader_t *reader);
+