diff options
| author | Philipp Maier <pmaier@sysmocom.de> | 2017-06-02 13:22:34 +0200 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2017-06-22 17:08:15 +0000 |
| commit | 3149b0d076477303a38df735fe579b1b06ee17b2 (patch) | |
| tree | b4d6d5c5db72eeff2acf722c4329e596cdefe0d1 /src/gsm/gsm0808_utils.c | |
| parent | a9b92769482585b17467008fa0d78085d7b10820 (diff) | |
gsm0808: add function gsm0808_chan_type_to_speech_code()
The permitted speech field used in channel type element (struct
gsm0808_channel_type) uses a different representation as
the type field in the speech codec element (struct
gsm0808_speech_codec)
This patch adds a function to convert from permitted speech to
speech codec type.
Change-Id: Ib26a9c20864459b2baaa04f49b6e7902ba44b7cb
Diffstat (limited to 'src/gsm/gsm0808_utils.c')
| -rw-r--r-- | src/gsm/gsm0808_utils.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/gsm/gsm0808_utils.c b/src/gsm/gsm0808_utils.c index 60fb91cd..64ffec4e 100644 --- a/src/gsm/gsm0808_utils.c +++ b/src/gsm/gsm0808_utils.c @@ -645,4 +645,41 @@ int gsm0808_dec_cell_id_list(struct gsm0808_cell_id_list *cil, return (int)(elem - old_elem); } +/*! \brief Convert the representation of the permitted speech codec identifier + * that is used in struct gsm0808_channel_type to the speech codec + * representation we use in struct gsm0808_speech_codec. + * \param[in] perm_spch to be converted (see also gsm0808_permitted_speech) + * \returns GSM speech codec type; negative on error */ +int gsm0808_chan_type_to_speech_codec(uint8_t perm_spch) +{ + /*! The speech codec type, which is used in the channel type field to + * signal the permitted speech versions (codecs) has a different + * encoding than the type field in the speech codec type element + * (See also 3GPP TS 48.008, 3.2.2.11 and 3.2.2.103) */ + + switch (perm_spch) { + case GSM0808_PERM_FR1: + return GSM0808_SCT_FR1; + case GSM0808_PERM_FR2: + return GSM0808_SCT_FR2; + case GSM0808_PERM_FR3: + return GSM0808_SCT_FR3; + case GSM0808_PERM_FR4: + return GSM0808_SCT_FR4; + case GSM0808_PERM_FR5: + return GSM0808_SCT_FR5; + case GSM0808_PERM_HR1: + return GSM0808_SCT_HR1; + case GSM0808_PERM_HR3: + return GSM0808_SCT_HR3; + case GSM0808_PERM_HR4: + return GSM0808_SCT_HR4; + case GSM0808_PERM_HR6: + return GSM0808_SCT_HR6; + } + + /* Invalid input */ + return -EINVAL; +} + /*! @} */ |