falconia has uploaded this change for review. ( https://gerrit.osmocom.org/c/libosmo-abis/+/43871?usp=email ) Change subject: trau2rtp_gen: add support for compressed CSD per TW-TS-007 ...................................................................... trau2rtp_gen: add support for compressed CSD per TW-TS-007 trau2rtp_gen utility converts TRAU frames supplied in hex form into RTP payloads also represented in hex form (TW-TS-005), wrapping around osmo_trau2rtp() API. Up until now this program had no support for CSD modes: the default osmo_trau2rtp() output format in these CSD modes is CLEARMODE with 160-byte payloads, which are too big for TW-TS-005. However, osmo_trau2rtp() now also supports the option of TW-TS-007 output format for CSD, and those compressed CSD payloads do fit within the limits of TW-TS-005 hex format. Add support for this compressed form of CSD to trau2rtp_gen. Change-Id: If8ae985672b33cf8867c9f2226bd15da719ab2e1 --- M tests/trau_conv/trau2rtp_gen.c M tests/trau_conv/trau2rtp_gen.notes 2 files changed, 14 insertions(+), 7 deletions(-) git pull ssh://gerrit.osmocom.org:29418/libosmo-abis refs/changes/71/43871/1 diff --git a/tests/trau_conv/trau2rtp_gen.c b/tests/trau_conv/trau2rtp_gen.c index 0f36d15..fb514a8 100644 --- a/tests/trau_conv/trau2rtp_gen.c +++ b/tests/trau_conv/trau2rtp_gen.c @@ -180,7 +180,7 @@ trau_8k_mode = false; direction = OSMO_TRAU_DIR_UL; - trau2rtp_st.rtp_extensions = 0; + trau2rtp_st.rtp_extensions = OSMO_RTP_EXT_TWTS007; while ((opt = getopt(argc, argv, "8dx")) != EOF) { switch (opt) { case '8': @@ -190,7 +190,7 @@ direction = OSMO_TRAU_DIR_DL; break; case 'x': - trau2rtp_st.rtp_extensions = + trau2rtp_st.rtp_extensions |= OSMO_RTP_EXT_TWTS001 | OSMO_RTP_EXT_TWTS002; break; default: diff --git a/tests/trau_conv/trau2rtp_gen.notes b/tests/trau_conv/trau2rtp_gen.notes index b6b3617..cba97bd 100644 --- a/tests/trau_conv/trau2rtp_gen.notes +++ b/tests/trau_conv/trau2rtp_gen.notes @@ -45,6 +45,10 @@ HRv1 TRAU-16k TS 48.061 sections 5.1.1.1 and 5.1.4.1.1 HRv1 TRAU-8k TS 48.061 sections 5.2.1.1 and 5.2.4.1 +CSD modes are also supported, in both TRAU-16k and TRAU-8k formats, with RTP +output in the compressed format of TW-TS-007. The resulting hex output follows +TW-TS-005 Annex D. + Input format and examples ========================= @@ -110,8 +114,8 @@ At the level of command line utilities, a separate program exists that exercises the AMR-specific TRAU to RTP conversion APIs - see tests/amr/trau2rtp_amr. -No CSD support yet -================== +CSD in TW-TS-007 format +======================= When the input is a TRAU frame in one of CSD modes, the output from osmo_trau2rtp() can be either a 160-byte CLEARMODE payload or a much more @@ -121,9 +125,12 @@ _can_ be represented in TW-TS-005 hex - and the current version of TW-TS-005 spec linked above includes Annex D that specifies such usage. -trau2rtp_gen utility can be extended to enable TW-TS-007 output and thereby add -support for at least one representation of GSM CSD in RTP - but no such -modification has been made yet. +trau2rtp_gen utility always produces output in TW-TS-007 format if the TRAU +frame input is in any of CSD modes. In the case of FR, HR and EFR speech the +presence or absence of -x option selects whether or not the output will include +RTP payload format extensions of TW-TS-001 or TW-TS-002 - but in the case of +CSD, TW-TS-007 output format is used unconditionally because the more standard +alternative of CLEARMODE cannot be supported in this environment. A need may also arise at some point to represent the bloated-but-standard CLEARMODE formats in hex as well. TW-TS-005 cannot be used for that purpose, -- To view, visit https://gerrit.osmocom.org/c/libosmo-abis/+/43871?usp=email To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings?usp=email Gerrit-MessageType: newchange Gerrit-Project: libosmo-abis Gerrit-Branch: master Gerrit-Change-Id: If8ae985672b33cf8867c9f2226bd15da719ab2e1 Gerrit-Change-Number: 43871 Gerrit-PatchSet: 1 Gerrit-Owner: falconia <falcon@freecalypso.org>