Support for AT&T *8 Transfer (VRU only)

libs/freetdm/src/include/private/ftdm_core.h

@@ -155,6 +155,10 @@ extern "C" {
 #define ftdm_clear_alarm_flag(obj, flag) (obj)->alarm_flags &= ~(flag)
 #define ftdm_test_alarm_flag(obj, flag) ((obj)->alarm_flags & flag)
 
+#define ftdm_set_io_flag(obj, flag) (obj)->io_flags |= (flag)
+#define ftdm_clear_io_flag(obj, flag) (obj)->io_flags &= ~(flag)
+#define ftdm_test_io_flag(obj, flag) ((obj)->io_flags & flag)
+
 /*!
   \brief Set a flag on an arbitrary object
   \command obj the object to set the flags on
@@ -399,6 +403,7 @@ struct ftdm_channel {
 	uint64_t flags;
 	uint32_t pflags;
 	uint32_t sflags;
+	uint8_t	 io_flags;
 	ftdm_alarm_flag_t alarm_flags;
 	ftdm_channel_feature_t features;
 	ftdm_codec_t effective_codec;
@@ -503,6 +508,7 @@ struct ftdm_span {
 	ftdm_span_stop_t stop;
 	ftdm_channel_sig_read_t sig_read;
 	ftdm_channel_sig_write_t sig_write;
+	ftdm_channel_sig_dtmf_t sig_dtmf;
 	ftdm_channel_state_processor_t state_processor; /*!< This guy is called whenever state processing is required */
 	void *io_data; /*!< Private I/O data per span. Do not touch unless you are an I/O module */
 	char *type;
@@ -591,6 +597,10 @@ FT_DECLARE(void) ftdm_ack_indication(ftdm_channel_t *ftdmchan, ftdm_channel_indi
 
 FT_DECLARE(ftdm_iterator_t *) ftdm_get_iterator(ftdm_iterator_type_t type, ftdm_iterator_t *iter);
 
+FT_DECLARE(ftdm_status_t) ftdm_channel_process_media(ftdm_channel_t *ftdmchan, void *data, ftdm_size_t *datalen);
+
+FIO_WRITE_FUNCTION(ftdm_raw_write);
+FIO_READ_FUNCTION(ftdm_raw_read);
 
 /*! 
  * \brief Retrieves an event from the span

libs/freetdm/src/include/private/ftdm_state.h

@@ -67,6 +67,7 @@ typedef enum {
 	FTDM_CHANNEL_STATE_PROGRESS,
 	FTDM_CHANNEL_STATE_PROGRESS_MEDIA,
 	FTDM_CHANNEL_STATE_UP,
+	FTDM_CHANNEL_STATE_TRANSFER,
 	FTDM_CHANNEL_STATE_IDLE,
 	FTDM_CHANNEL_STATE_TERMINATING,
 	FTDM_CHANNEL_STATE_CANCEL,
@@ -78,7 +79,7 @@ typedef enum {
 } ftdm_channel_state_t;
 #define CHANNEL_STATE_STRINGS "DOWN", "HOLD", "SUSPENDED", "DIALTONE", "COLLECT", \
 		"RING", "RINGING", "BUSY", "ATTN", "GENRING", "DIALING", "GET_CALLERID", "CALLWAITING", \
-		"RESTART", "PROCEED", "PROGRESS", "PROGRESS_MEDIA", "UP", "IDLE", "TERMINATING", "CANCEL", \
+		"RESTART", "PROCEED", "PROGRESS", "PROGRESS_MEDIA", "UP", "TRANSFER", "IDLE", "TERMINATING", "CANCEL", \
 		"HANGUP", "HANGUP_COMPLETE", "IN_LOOP", "RESET", "INVALID"
 FTDM_STR2ENUM_P(ftdm_str2ftdm_channel_state, ftdm_channel_state2str, ftdm_channel_state_t)
 

libs/freetdm/src/include/private/ftdm_types.h

@@ -189,6 +189,8 @@ typedef enum {
 	/* If this flag is set, then this span cannot be stopped individually, it can only be stopped
 		on freetdm unload */
 	FTDM_SPAN_NON_STOPPABLE = (1 << 13),
+	/* If this flag is set, then this span supports TRANSFER state */
+	FTDM_SPAN_USE_TRANSFER = (1 << 14),
 } ftdm_span_flag_t;
 
 /*! \brief Channel supported features */
@@ -206,6 +208,13 @@ typedef enum {
 	FTDM_CHANNEL_FEATURE_MF_GENERATE = (1<<10), /*!< Channel can generate R2 MF tones (read-only) */
 } ftdm_channel_feature_t;
 
+/*! \brief Channel IO pending flags */
+typedef enum {
+	FTDM_CHANNEL_IO_EVENT = (1 << 0),
+	FTDM_CHANNEL_IO_READ = (1 << 1),
+	FTDM_CHANNEL_IO_WRITE = (1 << 2),
+} ftdm_channel_io_flags_t;
+
 /*!< Channel flags. This used to be an enum but we reached the 32bit limit for enums, is safer this way */
 #define FTDM_CHANNEL_CONFIGURED    (1ULL << 0)
 #define FTDM_CHANNEL_READY         (1ULL << 1)
@@ -214,7 +223,6 @@ typedef enum {
 #define FTDM_CHANNEL_SUPRESS_DTMF  (1ULL << 4)
 #define FTDM_CHANNEL_TRANSCODE     (1ULL << 5)
 #define FTDM_CHANNEL_BUFFER        (1ULL << 6)
-#define FTDM_CHANNEL_EVENT         (1ULL << 7)
 #define FTDM_CHANNEL_INTHREAD      (1ULL << 8)
 #define FTDM_CHANNEL_WINK          (1ULL << 9)
 #define FTDM_CHANNEL_FLASH         (1ULL << 10)
@@ -331,10 +339,11 @@ typedef ftdm_status_t (*ftdm_span_start_t)(ftdm_span_t *span);
 typedef ftdm_status_t (*ftdm_span_stop_t)(ftdm_span_t *span);
 typedef ftdm_status_t (*ftdm_channel_sig_read_t)(ftdm_channel_t *ftdmchan, void *data, ftdm_size_t size);
 typedef ftdm_status_t (*ftdm_channel_sig_write_t)(ftdm_channel_t *ftdmchan, void *data, ftdm_size_t size);
+typedef ftdm_status_t (*ftdm_channel_sig_dtmf_t)(ftdm_channel_t *ftdmchan, const char *dtmf);
 
 typedef enum {
 	FTDM_ITERATOR_VARS = 1,
-	FTDM_ITERATOR_CHANS, 
+	FTDM_ITERATOR_CHANS,
 } ftdm_iterator_type_t;
 
 struct ftdm_iterator {