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45 lines
1.7 KiB
45 lines
1.7 KiB
/* |
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index.h - compact version of famous library mpg123 |
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Copyright (C) 2017 Uncle Mike |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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*/ |
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#ifndef INDEX_H |
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#define INDEX_H |
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typedef struct frame_index_s |
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{ |
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mpg_off_t *data; // actual data, the frame positions |
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mpg_off_t step; // advancement in frame number per index point |
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mpg_off_t next; // frame offset supposed to come next into the index |
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size_t size; // total number of possible entries |
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size_t fill; // number of used entries |
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size_t grow_size;// if > 0: index allowed to grow on need with these steps, instead of lowering resolution |
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} frame_index_t; |
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// the condition for a framenum to be appended to the index. |
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#define FI_NEXT( fi, framenum ) ((fi).size && framenum == (fi).next) |
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// initialize stuff, set things to zero and NULL... |
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void fi_init( frame_index_t *fi ); |
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// deallocate/zero things. |
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void fi_exit( frame_index_t *fi ); |
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// prepare a given size, preserving current fill, if possible. |
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int fi_resize( frame_index_t *fi, size_t newsize ); |
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// append a frame position, reducing index density if needed. |
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void fi_add( frame_index_t *fi, mpg_off_t pos ); |
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// replace the frame index |
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int fi_set( frame_index_t *fi, mpg_off_t *offsets, mpg_off_t step, size_t fill ); |
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// empty the index (setting fill=0 and step=1), but keep current size. |
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void fi_reset( frame_index_t *fi ); |
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#endif//INDEX_H
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