123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
/*
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* @brief Circular buffer.
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*
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* Contributor(s):
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*
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* Eric des Courtis <eric.des.courtis@benbria.com>
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* Piotr Gregor <piotrgregor@rsyncme.org>
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*/
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#ifndef __AVMD_BUFFER_H__
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#define __AVMD_BUFFER_H__
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#include <stdlib.h>
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#ifdef WIN32
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#include <float.h>
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#include <inttypes.h>
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#endif
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#ifndef INT16_MIN
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#define INT16_MIN (-32767-1)
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#endif
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#ifndef INT16_MAX
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#define INT16_MAX (32767)
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#endif
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#define BUFF_TYPE double
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typedef struct {
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size_t pos;
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size_t lpos;
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BUFF_TYPE *buf;
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size_t buf_len;
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size_t mask;
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size_t i;
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size_t backlog;
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} circ_buffer_t;
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extern size_t next_power_of_2(size_t v);
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#define INC_POS(b) \
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{ \
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(b)->pos++; \
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(b)->pos &= (b)->mask; \
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(b)->lpos + 1 < 2 * (b)->buf_len ? (b)->lpos++ : (b)->lpos = (b)->buf_len; \
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if ((b)->backlog < (b)->buf_len) (b)->backlog++; \
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}
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#define DEC_POS(b) \
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{ \
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(b)->pos--; \
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(b)->pos &= (b)->mask; \
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(b)->lpos--; \
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if (((b)->backlog - 1) < (b)->backlog) (b)->backlog--; \
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}
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#define GET_SAMPLE(b, i) ((b)->buf[(i) & (b)->mask])
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#define SET_SAMPLE(b, i, v) ((b)->buf[(i) & (b)->mask] = (v))
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#define INSERT_FRAME(b, f, l) \
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do { \
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for ((b)->i = 0; (b)->i < (l); (b)->i++) { \
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SET_SAMPLE((b), ((b)->i + (b)->pos), (f)[(b)->i]); \
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} \
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(b)->pos += (l); \
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(b)->lpos += (l); \
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(b)->pos %= (b)->buf_len; \
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(b)->backlog += (l); \
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if ((b)->backlog > (b)->buf_len) (b)->backlog = (b)->buf_len; \
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} while (0)
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/* ((f)[(b)->i] >= 0) ? \
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((BUFF_TYPE)(f)[(b)->i] / (BUFF_TYPE)INT16_MAX): \
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(0.0 - ((BUFF_TYPE)(f)[(b)->i] / (BUFF_TYPE)INT16_MIN)) \ */
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#define INSERT_INT16_FRAME(b, f, l) \
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{ \
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for ((b)->i = 0; (b)->i < (l); (b)->i++) { \
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SET_SAMPLE( \
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(b), \
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((b)->i + (b)->pos), \
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( \
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(BUFF_TYPE)(f)[(b)->i] \
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) \
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); \
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} \
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(b)->pos += (l); \
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(b)->lpos += (l); \
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(b)->pos &= (b)->mask; \
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(b)->backlog += (l); \
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if ((b)->backlog > (b)->buf_len) (b)->backlog = (b)->buf_len; \
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}
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#define CALC_BUFF_LEN(fl, bl) (((fl) >= (bl))? next_power_of_2((fl) << 1): next_power_of_2((bl) << 1))
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#define INIT_CIRC_BUFFER(bf, bl, fl, s) \
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{ \
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(bf)->buf_len = CALC_BUFF_LEN((fl), (bl)); \
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(bf)->mask = (bf)->buf_len - 1; \
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(bf)->buf = (BUFF_TYPE *) switch_core_session_alloc(s, (bf)->buf_len * sizeof(BUFF_TYPE)); \
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(bf)->pos = 0; \
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(bf)->lpos = 0; \
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(bf)->backlog = 0; \
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(bf)->i = 0; \
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}
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//#define DESTROY_CIRC_BUFFER(b) free((b)->buf)
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#define GET_BACKLOG_POS(b) ((b)->lpos - (b)->backlog)
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#define GET_CURRENT_POS(b) ((b)->pos)
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#define GET_CURRENT_LPOS(b) ((b)->lpos)
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#define GET_CURRENT_SAMPLE(b) GET_SAMPLE((b), GET_CURRENT_LPOS((b)))
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#define ADD_SAMPLE(b, s) \
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do { \
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INC_POS((b)); \
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SET_SAMPLE((b), GET_CURRENT_LPOS((b)), (s)); \
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} while (0)
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#endif /* __AVMD_BUFFER_H__ */
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