When a certain event occur, check if CT registered to receive that
notification and send a response.
Example event for PTS test TC_TG_NFY_BV_02_C:
> ACL data: handle 11 flags 0x02 dlen 22
L2CAP(d): cid 0x0043 len 18 [psm 23]
AVCTP: Command : pt 0x00 transaction 2 pid 0x110e
AV/C: Notify: address 0x48 opcode 0x00
Subunit: Panel
Opcode: Vendor Dependent
Company ID: 0x001958
AVRCP: RegisterNotification: pt 0x00 len 0x0005
EventID: 0x02 (EVENT_TRACK_CHANGED)
Interval: 0x00000000 (0 seconds)
< ACL data: handle 11 flags 0x02 dlen 26
L2CAP(d): cid 0x0043 len 22 [psm 23]
AVCTP: Response : pt 0x00 transaction 2 pid 0x110e
AV/C: Interim: address 0x48 opcode 0x00
Subunit: Panel
Opcode: Vendor Dependent
Company ID: 0x001958
AVRCP: RegisterNotification: pt 0x00 len 0x0009
EventID: 0x02 (EVENT_TRACK_CHANGED)
Identifier: 0x0 (PLAYING)
[...]
< ACL data: handle 11 flags 0x02 dlen 26
L2CAP(d): cid 0x0043 len 22 [psm 23]
AVCTP: Response : pt 0x00 transaction 2 pid 0x110e
AV/C: Changed: address 0x48 opcode 0x00
Subunit: Panel
Opcode: Vendor Dependent
Company ID: 0x001958
AVRCP: RegisterNotification: pt 0x00 len 0x0009
EventID: 0x02 (EVENT_TRACK_CHANGED)
Identifier: 0x0 (PLAYING)
---
audio/control.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 91 insertions(+), 4 deletions(-)
diff --git a/audio/control.c b/audio/control.c
index a29a392..2070e10 100644
--- a/audio/control.c
+++ b/audio/control.c
@@ -79,6 +79,7 @@
#define CTYPE_ACCEPTED 0x9
#define CTYPE_REJECTED 0xA
#define CTYPE_STABLE 0xC
+#define CTYPE_CHANGED 0xD
#define CTYPE_INTERIM 0xF
/* opcodes */
@@ -313,6 +314,7 @@ struct control {
uint8_t key_quirks[256];
uint16_t registered_events;
+ uint8_t transaction_events[AVRCP_EVENT_TRACK_CHANGED + 1];
};
static struct {
@@ -716,6 +718,73 @@ static const char *battery_status_to_str(enum battery_status status)
return NULL;
}
+static int avctp_send_event(struct control *control, uint8_t id, void *data)
+{
+ uint8_t buf[AVCTP_HEADER_LENGTH + AVRCP_HEADER_LENGTH +
+ AVRCP_SPECAVCPDU_HEADER_LENGTH + 9];
+ struct avctp_header *avctp = (void *) buf;
+ struct avrcp_header *avrcp = (void *) &buf[AVCTP_HEADER_LENGTH];
+ struct avrcp_spec_avc_pdu *pdu = (void *) &buf[AVCTP_HEADER_LENGTH +
+ AVRCP_HEADER_LENGTH];
+ int sk = g_io_channel_unix_get_fd(control->io);
+ uint16_t size;
+
+ memset(buf, 0, sizeof(buf));
+
+ avctp->transaction = control->transaction_events[id];
+ avctp->packet_type = AVCTP_PACKET_SINGLE;
+ avctp->cr = AVCTP_RESPONSE;
+ avctp->pid = htons(AV_REMOTE_SVCLASS_ID);
+
+ avrcp->code = CTYPE_CHANGED;
+ avrcp->subunit_type = SUBUNIT_PANEL;
+ avrcp->opcode = OP_VENDORDEP;
+
+ pdu->company_id[0] = IEEEID_BTSIG >> 16;
+ pdu->company_id[1] = (IEEEID_BTSIG >> 8) & 0xFF;
+ pdu->company_id[2] = IEEEID_BTSIG & 0xFF;
+
+ pdu->pdu_id = AVRCP_REGISTER_NOTIFICATION;
+ pdu->params[0] = id;
+
+ DBG("id=%u", id);
+
+ switch (id) {
+ case AVRCP_EVENT_PLAYBACK_STATUS_CHANGED:
+ size = 2;
+ pdu->params[1] = *((uint8_t *)data);
+
+ break;
+ case AVRCP_EVENT_TRACK_CHANGED: {
+ size = 9;
+
+ /*
+ * AVRCP 1.3 supports only one track identifier: PLAYING
+ * (0x0). When 1.4 version is added, this shall be changed to
+ * contain the identifier of the track.
+ */
+ memset(&pdu->params[1], 0, 8);
+
+ break;
+ }
+ default:
+ error("Unknown event %u", id);
+ return -EINVAL;
+ }
+
+ pdu->params_len = htons(size);
+ size += AVCTP_HEADER_LENGTH + AVRCP_HEADER_LENGTH +
+ AVRCP_SPECAVCPDU_HEADER_LENGTH;
+
+ if (write(sk, buf, size) < 0)
+ return -errno;
+
+ /* Unregister event as per AVRCP 1.3 spec, section 5.4.2 */
+ control->registered_events ^= 1 << id;
+
+ return 0;
+}
+
static void mp_get_playback_status(struct media_player *mp, uint8_t *status,
uint32_t *elapsed, uint32_t *track_len)
{
@@ -754,6 +823,13 @@ static void mp_set_playback_status(struct control *control, uint8_t status,
return;
mp->status = status;
+
+ if (control->state == AVCTP_STATE_CONNECTED &&
+ (control->registered_events &
+ (1 << AVRCP_EVENT_PLAYBACK_STATUS_CHANGED))) {
+ avctp_send_event(control, AVRCP_EVENT_PLAYBACK_STATUS_CHANGED,
+ &status);
+ }
}
/*
@@ -901,6 +977,12 @@ static void mp_set_media_attributes(struct control *control,
"\tTrack number: %u\n\tTrack duration: %u",
mi->title, mi->artist, mi->album, mi->genre,
mi->ntracks, mi->track, mi->track_len);
+
+ if (control->state == AVCTP_STATE_CONNECTED &&
+ (control->registered_events &
+ (1 << AVRCP_EVENT_TRACK_CHANGED))) {
+ avctp_send_event(control, AVRCP_EVENT_TRACK_CHANGED, NULL);
+ }
}
static int avrcp_handle_get_capabilities(struct control *control,
@@ -1241,7 +1323,8 @@ static int avrcp_handle_get_play_status(struct control *control,
}
static int avrcp_handle_register_notification(struct control *control,
- struct avrcp_spec_avc_pdu *pdu)
+ struct avrcp_spec_avc_pdu *pdu,
+ uint8_t transaction)
{
uint16_t len = ntohs(pdu->params_len);
uint8_t status;
@@ -1280,8 +1363,9 @@ static int avrcp_handle_register_notification(struct control *control,
goto err;
}
- /* Register event */
+ /* Register event and save the transaction used */
control->registered_events |= (1 << pdu->params[0]);
+ control->transaction_events[pdu->params[0]] = transaction;
pdu->params_len = htons(len);
@@ -1294,6 +1378,7 @@ err:
/* handle vendordep pdu inside an avctp packet */
static int handle_vendordep_pdu(struct control *control,
+ struct avctp_header *avctp,
struct avrcp_header *avrcp,
int operand_count)
{
@@ -1464,7 +1549,8 @@ static int handle_vendordep_pdu(struct control *control,
goto err_metadata;
}
- len = avrcp_handle_register_notification(control, pdu);
+ len = avrcp_handle_register_notification(control, pdu,
+ avctp->transaction);
if (len < 0)
goto err_metadata;
@@ -1662,7 +1748,8 @@ static gboolean control_cb(GIOChannel *chan, GIOCondition cond,
int r_size;
operand_count -= 3;
avctp->cr = AVCTP_RESPONSE;
- r_size = handle_vendordep_pdu(control, avrcp, operand_count);
+ r_size = handle_vendordep_pdu(control, avctp, avrcp,
+ operand_count);
packet_size = AVCTP_HEADER_LENGTH + r_size;
} else {
avctp->cr = AVCTP_RESPONSE;
--
1.7.6
--
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