mobile/vty_interface.c: add new 'audio' section

This change introduces a new node named 'AUDIO', which is intended
to organize some audio related settings, such as:

  - io-target - TCH frame I/O back-end (e.g. gapk, hardware);
  - alsa-output-dev - ALSA playback (i.e. speakers) device name;
  - alsa-input-dev - ALSA recording (i.e. mic) device name.

The last two are actual when 'io-target' is set to 'gapk'.
For now, all introduced parameters don't affect anything.

Change-Id: I62cd5ef22ca2290fcafe65c78537ddbcb39fb8c6

1 files changed, 21 insertions, 0 deletions

diff --git a/src/host/layer23/include/osmocom/bb/mobile/settings.h b/src/host/layer23/include/osmocom/bb/mobile/settings.h
index 99bbbdae..46e88045 100644
--- a/src/host/layer23/include/osmocom/bb/mobile/settings.h
+++ b/src/host/layer23/include/osmocom/bb/mobile/settings.h
@@ -13,6 +13,24 @@ enum mncc_handler_t {
 	MNCC_HANDLER_DUMMY,
 };
 
+/* TCH frame I/O target */
+enum audio_io_target {
+	/* Nothing, don't care about TCH */
+	AUDIO_IO_NONE = 0,
+	/* L1 hardware (e.g. Calypso DSP) */
+	AUDIO_IO_HARDWARE,
+	/* External MNCC application (e.g. LCR) */
+	AUDIO_IO_SOCKET,
+	/* Built-in GAPK-based back-end */
+	AUDIO_IO_GAPK,
+};
+
+struct audio_settings {
+	enum audio_io_target io_target;
+	char alsa_output_dev[128];
+	char alsa_input_dev[128];
+};
+
 struct gsm_settings {
 	char			layer2_socket_path[128];
 	char			sap_socket_path[128];
@@ -21,6 +39,9 @@ struct gsm_settings {
 	/* MNCC handler */
 	enum mncc_handler_t	mncc_handler;
 
+	/* Audio settings */
+	struct audio_settings	audio;
+
 	/* IMEI */
 	char			imei[16];
 	char			imeisv[17];