FreeCalypso > hg > gsm-codec-lib
view doc/Utils-overview @ 477:4c9222d95647
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 | 047c198408c8 |
| children | 4f13db3a7086 |
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Here is the complete list of all command line utilities included in the present package: amr-cod-parse See AMR-study-utils article. amr-ietf-parse amr-cod2ietf amr-ietf2cod gsm-amr2efr See AMR-EFR-conversion article. gsm-efr2amr gsmefr-cod-parse See EFR-testing article. gsmefr-dec-parse gsmefr-cod2gsmx This program reads an EFR codec frame stream in ETSI *.cod format and converts it to Themyscira gsmx format. gsmefr-decode See Codec-utils article. gsmefr-decode-r gsmefr-encode gsmefr-encode-r gsmefr-dlcap-dec See Calypso-TCH-downlink article. gsmefr-dlcap-gsmx gsmefr-dlcap-parse gsmefr-etsi-dec See EFR-testing article. gsmefr-etsi-enc gsmefr-rec2etsi This program reads an EFR session recording in gsmx format and converts it into ETSI decoder input (.dec) format. It was written early in the project as a sanity check, to verify that the format of TCH uplink from sysmoBTS in EFR mode matches our expectations, before embarking on the labor-intensive project to librify EFR reference code from ETSI. gsmfr-cod2std This program reads an FR codec frame stream in ETSI *.cod format and converts it to "standard" *.gsm format. gsmfr-decode See Codec-utils article. gsmfr-decode-r gsmfr-decode-rb gsmfr-encode gsmfr-encode-r gsmfr-dlcap-gsmx See Calypso-TCH-downlink article. gsmfr-dlcap-parse gsmfr-preproc See FR1-Rx-DTX article. gsmrec-dump See Binary-file-format article. pcm16-check13 This program reads a 16-bit linear PCM recording file (raw BE by default, or raw LE with -l option) and checks if the 3 least significant bits of every sample are all zeros. All linear PCM samples consumed or generated by GSM codecs are only 13 bits wide, left-justified in 16-bit words, and so is output from G.711 A-law decoding - thus it is useful to be able to check if a given file in 16-bit PCM format is purely 13-bit or not. pcm16-raw2wav See PCM-file-formats article. pcm16-wav2raw pcm16-to-alaw See PCM8-conversions article. pcm16-to-ulaw pcm8-to-pcm16