68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
#ifndef _ICELIB_H_
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#define _ICELIB_H_
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#include <stdint.h>
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/* Decodes Inti Creates's "ICE" engine BIGRP sounds. */
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#define ICESND_CODEC_RANGE 0x00
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#define ICESND_CODEC_DATA 0x01
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#define ICESND_CODEC_MIDI 0x02
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#define ICESND_CODEC_DCT 0x03
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#define ICESND_RESULT_OK 0
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#define ICESND_ERROR_HEADER -1
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#define ICESND_ERROR_SETUP -2
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#define ICESND_ERROR_DECODE -3
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typedef struct icesnd_handle_t icesnd_handle_t;
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#define ICESND_SEEK_SET 0
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#define ICESND_SEEK_CUR 1
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#define ICESND_SEEK_END 2
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typedef struct {
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/* whole file in memory (for testing) */
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const uint8_t* filebuf;
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int filebuf_size;
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/* custom IO */
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void* arg;
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int (*read)(void* dst, int size, int n, void* arg);
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int (*seek)(void* arg, int offset, int whence);
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} icesnd_callback_t;
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/* Inits ICE lib with config.
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* Original code expects all data in memory, but this allows setting read callbacks
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* (making it feed-style was a bit complex due to how data is laid out) */
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icesnd_handle_t* icesnd_init(int target_subsong, icesnd_callback_t* cb);
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void icesnd_free(icesnd_handle_t* handle);
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/* resets the decoder. If loop_starts and file loops and
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* (format is not seekable but separated into intro+body blocks) */
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void icesnd_reset(icesnd_handle_t* handle, int loop_start);
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/* Decodes up to samples for N channels into sbuf (interleaved). Returns samples done,
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* 0 if not possible (non-looped files past end) or negative on error.
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* May return less than wanted samples on block boundaries.
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*
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* It's designed to decode an arbitrary number of samples, as data isn't divided into frames (original
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* player does sample_rate/60.0 at a time). Codec 0 is aligned to 100 samples and codec 3 to 16 though. */
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int icesnd_decode(icesnd_handle_t* handle, int16_t* sbuf, int max_samples);
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typedef struct {
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int total_subsongs;
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int codec;
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int sample_rate;
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int channels;
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int loop_start;
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int num_samples;
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int loop_flag;
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} icesnd_info_t;
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/* loads info */
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int icesnd_info(icesnd_handle_t* handle, icesnd_info_t* info);
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#endif
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