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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 2d46abdfbe91
children 20d44cfc219c
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1 Changes from gsm-codec-lib-r2 to gsm-codec-lib-r3:
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2
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3 * Libgsmfrp has been replaced with libgsmfr2, a major version change per SemVer.
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5 * The former dependency on historical libgsm has been eliminated; the
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6 functionality of libgsm (GSM 06.10 encoder and decoder implementation) has
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7 been absorbed into libgsmfr2.
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8
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2d46abdfbe91 libgsmefr version 1.1.0 for DHF addition
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9 * Libgsmefr version 1.1.0 exhibits approximately 2x performance improvement
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10 over the original version, and also exhibits a small addition to the public
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11 API: the RTP-encoded form of the standard EFR DHF is now provided as a const
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12 datum.
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14 * New library added: libtwamr for 3GPP AMR-NB codec, serving as a replacement
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15 for libopencore-amrnb in Themyscira GSM codec exploration workflows.
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17 * New command line utilities: amrefr-* and twamr-* related to libtwamr,
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18 gsmfr-* updates for libgsmfr2.
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20 * gsmfr-* utilities set: gsmfr-hand-test and gsmfr-max-out hack programs have
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21 been dropped. These hack programs were never properly documented and were
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22 written only as part of a debug chase, in pursuit of a bug that ultimately
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23 turned out to be in our then-hacky patch to osmo-bts-sysmo.
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25 * The configuration and build process has been revamped: the full suite of
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26 libraries and utilities can now be installed in any desired file system
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27 location without contortions.
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29 Changes from gsm-codec-lib-r1 to gsm-codec-lib-r2:
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31 * Libgsmfrp evolved from version 1.0.0 to version 1.0.2; please see
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32 doc/FR1-Rx-DTX for a detailing listing of libgsmfrp changes.
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34 * Some new utilities have been developed for studying AMR: see
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35 doc/AMR-study-utils for more information.
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37 * The subject of conversions between 16-bit 2's complement linear PCM and 8-bit
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38 A-law and mu-law PCM formats (G.711) has been thoroughly studied, the findings
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39 have been documented in doc/PCM8-conversions, and some new command line
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40 utilities have been added, described in the same article.
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42 * Many new table generators have been added to the dev subdirectory; some of
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43 them may be useful to other software developers.
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45 * pcap utilities have been split off to a separate rtp-debug-utils repository;
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46 this split was made so that those utilities can be developed freely while the
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47 gsm-codec-lib repository remains under strict release process control.