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.

/*-----------------------------------------------------*
 | Table for routine Log2().                           |
 -----------------------------------------------------*/

static const Word16 table[33] =
{
    0, 1455, 2866, 4236, 5568, 6863, 8124, 9352, 10549, 11716,
    12855, 13967, 15054, 16117, 17156, 18172, 19167, 20142, 21097, 22033,
    22951, 23852, 24735, 25603, 26455, 27291, 28113, 28922, 29716, 30497,
    31266, 32023, 32767
};