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annotate libtwamr/bits2prm.h @ 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 f931e704adc5
children
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1 /*
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2 *****************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 *****************************************************************************
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9 *
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10 * File : bits2prm.h
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11 * Purpose : Retrieves the vector of encoder parameters from
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12 * : the received serial bits in a frame.
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13 *
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14 *****************************************************************************
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15 */
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16 #ifndef bits2prm_h
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17 #define bits2prm_h "$Id $"
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18
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19 /*
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20 *****************************************************************************
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21 * INCLUDE FILES
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22 *****************************************************************************
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23 */
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24 #include "typedef.h"
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25 #include "tw_amr.h" /* for enum Mode */
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26 /*
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27 *****************************************************************************
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28 * DEFINITION OF DATA TYPES
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29 *****************************************************************************
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30 */
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31
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32 /*
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33 *****************************************************************************
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34 * DECLARATION OF PROTOTYPES
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35 *****************************************************************************
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36 */
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37 /*
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38 **************************************************************************
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39 *
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40 * Function : Bits2prm
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41 * Purpose : Retrieves the vector of encoder parameters from
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42 * the received serial bits in a frame.
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43 * Returns : void
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44 *
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45 **************************************************************************
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46 */
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47 void Bits2prm (
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48 enum Mode mode,
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49 const Word16 bits[], /* input : serial bits (max 244) */
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50 Word16 prm[] /* output: analysis parameters (max 57) */
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51 );
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52
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53 #endif