f40bfc9267
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
#include "bitstream.h"
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#define SHN_OUTPUT_DEPTH 29 /* 28 bits + sign */
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#define MAX_CHANNELS 2
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#define MAX_PRED_ORDER 16
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#define MAX_NWRAP MAX_PRED_ORDER
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#define MAX_NMEAN 4
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/* NUM_DEC_LOOPS should be even number */
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#define NUM_DEC_LOOPS 26
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#define DEFAULT_BLOCK_SIZE 256
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#define MAX_HEADER_SIZE DEFAULT_BLOCK_SIZE*4
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#define MAX_BUFFER_SIZE 2*DEFAULT_BLOCK_SIZE*NUM_DEC_LOOPS
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#define MAX_DECODE_SIZE ((DEFAULT_BLOCK_SIZE*NUM_DEC_LOOPS/2) + MAX_NWRAP)
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#define MAX_OFFSET_SIZE MAX_NMEAN
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#define FN_DIFF0 0
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#define FN_DIFF1 1
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#define FN_DIFF2 2
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#define FN_DIFF3 3
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#define FN_QUIT 4
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#define FN_BLOCKSIZE 5
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#define FN_BITSHIFT 6
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#define FN_QLPC 7
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#define FN_ZERO 8
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#define FN_VERBATIM 9
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#define FN_ERROR 10
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typedef struct ShortenContext {
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GetBitContext gb;
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int32_t lpcqoffset;
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uint32_t totalsamples;
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int header_bits;
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int channels;
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int sample_rate;
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int bits_per_sample;
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int version;
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int bitshift;
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int last_bitshift;
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int nmean;
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int nwrap;
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int blocksize;
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int bitindex;
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} ShortenContext;
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int shorten_init(ShortenContext* s, uint8_t *buf, int buf_size);
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int shorten_decode_frames(ShortenContext *s, int *nsamples,
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int32_t *decoded0, int32_t *decoded1,
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int32_t *offset0, int32_t *offset1,
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uint8_t *buf, int buf_size,
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void (*yield)(void)) ICODE_ATTR;
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