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annotate amrconv/bitmanip.c @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents b092a510141e
children
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1 /*
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2 * This module provides two utility functions that serve as building blocks
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3 * for frame bit reordering operations.
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4 */
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5
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6 #include <stdint.h>
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8 msb_get_bit(buf, bn)
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9 uint8_t *buf;
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10 {
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11 int pos_byte = bn >> 3;
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12 int pos_bit = 7 - (bn & 7);
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14 return (buf[pos_byte] >> pos_bit) & 1;
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15 }
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17 msb_set_bit(buf, bn, bit)
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18 uint8_t *buf;
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19 {
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20 int pos_byte = bn >> 3;
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21 int pos_bit = 7 - (bn & 7);
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23 if (bit)
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24 buf[pos_byte] |= (1 << pos_bit);
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25 else
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26 buf[pos_byte] &= ~(1 << pos_bit);
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27 }