1 /******************************************************************************
2 *
3 * Copyright 2003-2016 Broadcom Corporation
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 ******************************************************************************/
18
19 /******************************************************************************
20 *
21 * Interface to AVRCP mandatory commands
22 *
23 ******************************************************************************/
24 #include <base/logging.h>
25 #include <string.h>
26
27 #include <log/log.h>
28
29 #include "avrc_api.h"
30 #include "avrc_int.h"
31 #include "bt_common.h"
32 #include "btu.h"
33 #include "osi/include/fixed_queue.h"
34 #include "osi/include/osi.h"
35 #include "osi/include/properties.h"
36
37 /*****************************************************************************
38 * Global data
39 ****************************************************************************/
40
41 #define AVRC_MAX_RCV_CTRL_EVT AVCT_BROWSE_UNCONG_IND_EVT
42
43 #ifndef MAX
44 #define MAX(a, b) ((a) > (b) ? (a) : (b))
45 #endif
46
47 static const uint8_t avrc_ctrl_event_map[] = {
48 AVRC_OPEN_IND_EVT, /* AVCT_CONNECT_CFM_EVT */
49 AVRC_OPEN_IND_EVT, /* AVCT_CONNECT_IND_EVT */
50 AVRC_CLOSE_IND_EVT, /* AVCT_DISCONNECT_CFM_EVT */
51 AVRC_CLOSE_IND_EVT, /* AVCT_DISCONNECT_IND_EVT */
52 AVRC_CONG_IND_EVT, /* AVCT_CONG_IND_EVT */
53 AVRC_UNCONG_IND_EVT, /* AVCT_UNCONG_IND_EVT */
54 AVRC_BROWSE_OPEN_IND_EVT, /* AVCT_BROWSE_CONN_CFM_EVT */
55 AVRC_BROWSE_OPEN_IND_EVT, /* AVCT_BROWSE_CONN_IND_EVT */
56 AVRC_BROWSE_CLOSE_IND_EVT, /* AVCT_BROWSE_DISCONN_CFM_EVT */
57 AVRC_BROWSE_CLOSE_IND_EVT, /* AVCT_BROWSE_DISCONN_IND_EVT */
58 AVRC_BROWSE_CONG_IND_EVT, /* AVCT_BROWSE_CONG_IND_EVT */
59 AVRC_BROWSE_UNCONG_IND_EVT /* AVCT_BROWSE_UNCONG_IND_EVT */
60 };
61
62 /* use this unused opcode to indication no need to call the callback function */
63 #define AVRC_OP_DROP 0xFE
64 /* use this unused opcode to indication no need to call the callback function &
65 * free buffer */
66 #define AVRC_OP_DROP_N_FREE 0xFD
67
68 #define AVRC_OP_UNIT_INFO_RSP_LEN 8
69 #define AVRC_OP_SUB_UNIT_INFO_RSP_LEN 8
70 #define AVRC_OP_REJ_MSG_LEN 11
71
72 /* Flags definitions for AVRC_MsgReq */
73 #define AVRC_MSG_MASK_IS_VENDOR_CMD 0x01
74 #define AVRC_MSG_MASK_IS_CONTINUATION_RSP 0x02
75
76 /******************************************************************************
77 *
78 * Function avrc_ctrl_cback
79 *
80 * Description This is the callback function used by AVCTP to report
81 * received link events.
82 *
83 * Returns Nothing.
84 *
85 *****************************************************************************/
avrc_ctrl_cback(uint8_t handle,uint8_t event,uint16_t result,const RawAddress * peer_addr)86 static void avrc_ctrl_cback(uint8_t handle, uint8_t event, uint16_t result,
87 const RawAddress* peer_addr) {
88 uint8_t avrc_event;
89
90 if (event <= AVRC_MAX_RCV_CTRL_EVT && avrc_cb.ccb[handle].ctrl_cback) {
91 avrc_event = avrc_ctrl_event_map[event];
92 if (event == AVCT_CONNECT_CFM_EVT) {
93 if (result != 0) /* failed */
94 avrc_event = AVRC_CLOSE_IND_EVT;
95 }
96 avrc_cb.ccb[handle].ctrl_cback.Run(handle, avrc_event, result, peer_addr);
97 }
98
99 if ((event == AVCT_DISCONNECT_CFM_EVT) ||
100 (event == AVCT_DISCONNECT_IND_EVT)) {
101 avrc_flush_cmd_q(handle);
102 alarm_free(avrc_cb.ccb_int[handle].tle);
103 avrc_cb.ccb_int[handle].tle = NULL;
104 }
105 }
106
107 /******************************************************************************
108 *
109 * Function avrc_flush_cmd_q
110 *
111 * Description Flush command queue for the specified avrc handle
112 *
113 * Returns Nothing.
114 *
115 *****************************************************************************/
avrc_flush_cmd_q(uint8_t handle)116 void avrc_flush_cmd_q(uint8_t handle) {
117 AVRC_TRACE_DEBUG("AVRC: Flushing command queue for handle=0x%02x", handle);
118 avrc_cb.ccb_int[handle].flags &= ~AVRC_CB_FLAGS_RSP_PENDING;
119
120 alarm_cancel(avrc_cb.ccb_int[handle].tle);
121 fixed_queue_free(avrc_cb.ccb_int[handle].cmd_q, osi_free);
122 avrc_cb.ccb_int[handle].cmd_q = NULL;
123 }
124
125 /******************************************************************************
126 *
127 * Function avrc_process_timeout
128 *
129 * Description Handle avrc command timeout
130 *
131 * Returns Nothing.
132 *
133 *****************************************************************************/
avrc_process_timeout(void * data)134 void avrc_process_timeout(void* data) {
135 tAVRC_PARAM* param = (tAVRC_PARAM*)data;
136
137 AVRC_TRACE_DEBUG("AVRC: command timeout (handle=0x%02x, label=0x%02x)",
138 param->handle, param->label);
139
140 /* Notify app */
141 if (avrc_cb.ccb[param->handle].ctrl_cback) {
142 avrc_cb.ccb[param->handle].ctrl_cback.Run(
143 param->handle, AVRC_CMD_TIMEOUT_EVT, param->label, NULL);
144 }
145
146 /* If vendor command timed-out, then send next command in the queue */
147 if (param->msg_mask & AVRC_MSG_MASK_IS_VENDOR_CMD) {
148 avrc_send_next_vendor_cmd(param->handle);
149 }
150 osi_free(param);
151 }
152
153 /******************************************************************************
154 *
155 * Function avrc_send_next_vendor_cmd
156 *
157 * Description Dequeue and send next vendor command for given handle
158 *
159 * Returns Nothing.
160 *
161 *****************************************************************************/
avrc_send_next_vendor_cmd(uint8_t handle)162 void avrc_send_next_vendor_cmd(uint8_t handle) {
163 BT_HDR* p_next_cmd;
164 uint8_t next_label;
165
166 while ((p_next_cmd = (BT_HDR*)fixed_queue_try_dequeue(
167 avrc_cb.ccb_int[handle].cmd_q)) != NULL) {
168 p_next_cmd->event &= 0xFF; /* opcode */
169 next_label = (p_next_cmd->layer_specific) >> 8; /* extract label */
170 p_next_cmd->layer_specific &= 0xFF; /* AVCT_DATA_CTRL or AVCT_DATA_BROWSE */
171
172 AVRC_TRACE_DEBUG(
173 "AVRC: Dequeuing command 0x%08x (handle=0x%02x, label=0x%02x)",
174 p_next_cmd, handle, next_label);
175
176 /* Send the message */
177 if ((AVCT_MsgReq(handle, next_label, AVCT_CMD, p_next_cmd)) ==
178 AVCT_SUCCESS) {
179 /* Start command timer to wait for response */
180 avrc_start_cmd_timer(handle, next_label, AVRC_MSG_MASK_IS_VENDOR_CMD);
181 return;
182 }
183 }
184
185 if (p_next_cmd == NULL) {
186 /* cmd queue empty */
187 avrc_cb.ccb_int[handle].flags &= ~AVRC_CB_FLAGS_RSP_PENDING;
188 }
189 }
190
191 /******************************************************************************
192 *
193 * Function avrc_start_cmd_timer
194 *
195 * Description Start timer for waiting for responses
196 *
197 * Returns Nothing.
198 *
199 *****************************************************************************/
avrc_start_cmd_timer(uint8_t handle,uint8_t label,uint8_t msg_mask)200 void avrc_start_cmd_timer(uint8_t handle, uint8_t label, uint8_t msg_mask) {
201 tAVRC_PARAM* param =
202 static_cast<tAVRC_PARAM*>(osi_malloc(sizeof(tAVRC_PARAM)));
203 param->handle = handle;
204 param->label = label;
205 param->msg_mask = msg_mask;
206
207 AVRC_TRACE_DEBUG("AVRC: starting timer (handle=0x%02x, label=0x%02x)", handle,
208 label);
209
210 alarm_set_on_mloop(avrc_cb.ccb_int[handle].tle, AVRC_CMD_TOUT_MS,
211 avrc_process_timeout, param);
212 }
213
214 /******************************************************************************
215 *
216 * Function avrc_get_data_ptr
217 *
218 * Description Gets a pointer to the data payload in the packet.
219 *
220 * Returns A pointer to the data payload.
221 *
222 *****************************************************************************/
avrc_get_data_ptr(BT_HDR * p_pkt)223 static uint8_t* avrc_get_data_ptr(BT_HDR* p_pkt) {
224 return (uint8_t*)(p_pkt + 1) + p_pkt->offset;
225 }
226
227 /******************************************************************************
228 *
229 * Function avrc_copy_packet
230 *
231 * Description Copies an AVRC packet to a new buffer. In the new buffer,
232 * the payload offset is at least AVCT_MSG_OFFSET octets.
233 *
234 * Returns The buffer with the copied data.
235 *
236 *****************************************************************************/
avrc_copy_packet(BT_HDR * p_pkt,int rsp_pkt_len)237 static BT_HDR* avrc_copy_packet(BT_HDR* p_pkt, int rsp_pkt_len) {
238 const int offset = MAX(AVCT_MSG_OFFSET, p_pkt->offset);
239 const int pkt_len = MAX(rsp_pkt_len, p_pkt->len);
240 BT_HDR* p_pkt_copy = (BT_HDR*)osi_malloc(BT_HDR_SIZE + offset + pkt_len);
241
242 /* Copy the packet header, set the new offset, and copy the payload */
243 memcpy(p_pkt_copy, p_pkt, BT_HDR_SIZE);
244 p_pkt_copy->offset = offset;
245 uint8_t* p_data = avrc_get_data_ptr(p_pkt);
246 uint8_t* p_data_copy = avrc_get_data_ptr(p_pkt_copy);
247 memcpy(p_data_copy, p_data, p_pkt->len);
248
249 return p_pkt_copy;
250 }
251
252 /******************************************************************************
253 *
254 * Function avrc_prep_end_frag
255 *
256 * Description This function prepares an end response fragment
257 *
258 * Returns Nothing.
259 *
260 *****************************************************************************/
avrc_prep_end_frag(uint8_t handle)261 static void avrc_prep_end_frag(uint8_t handle) {
262 tAVRC_FRAG_CB* p_fcb;
263 BT_HDR* p_pkt_new;
264 uint8_t *p_data, *p_orig_data;
265 uint8_t rsp_type;
266
267 AVRC_TRACE_DEBUG("%s", __func__);
268 p_fcb = &avrc_cb.fcb[handle];
269
270 /* The response type of the end fragment should be the same as the the PDU of
271 * "End Fragment Response" Errata:
272 * https://www.bluetooth.org/errata/errata_view.cfm?errata_id=4383
273 */
274 p_orig_data = ((uint8_t*)(p_fcb->p_fmsg + 1) + p_fcb->p_fmsg->offset);
275 rsp_type = ((*p_orig_data) & AVRC_CTYPE_MASK);
276
277 p_pkt_new = p_fcb->p_fmsg;
278 p_pkt_new->len -=
279 (AVRC_MAX_CTRL_DATA_LEN - AVRC_VENDOR_HDR_SIZE - AVRC_MIN_META_HDR_SIZE);
280 p_pkt_new->offset +=
281 (AVRC_MAX_CTRL_DATA_LEN - AVRC_VENDOR_HDR_SIZE - AVRC_MIN_META_HDR_SIZE);
282 p_data = (uint8_t*)(p_pkt_new + 1) + p_pkt_new->offset;
283 *p_data++ = rsp_type;
284 *p_data++ = (AVRC_SUB_PANEL << AVRC_SUBTYPE_SHIFT);
285 *p_data++ = AVRC_OP_VENDOR;
286 AVRC_CO_ID_TO_BE_STREAM(p_data, AVRC_CO_METADATA);
287 *p_data++ = p_fcb->frag_pdu;
288 *p_data++ = AVRC_PKT_END;
289
290 /* 4=pdu, pkt_type & len */
291 UINT16_TO_BE_STREAM(
292 p_data, (p_pkt_new->len - AVRC_VENDOR_HDR_SIZE - AVRC_MIN_META_HDR_SIZE));
293 }
294
295 /******************************************************************************
296 *
297 * Function avrc_send_continue_frag
298 *
299 * Description This function sends a continue response fragment
300 *
301 * Returns AVRC_SUCCESS if successful.
302 * AVRC_BAD_HANDLE if handle is invalid.
303 *
304 *****************************************************************************/
avrc_send_continue_frag(uint8_t handle,uint8_t label)305 static uint16_t avrc_send_continue_frag(uint8_t handle, uint8_t label) {
306 tAVRC_FRAG_CB* p_fcb;
307 BT_HDR *p_pkt_old, *p_pkt;
308 uint8_t *p_old, *p_data;
309 uint8_t cr = AVCT_RSP;
310
311 p_fcb = &avrc_cb.fcb[handle];
312 p_pkt = p_fcb->p_fmsg;
313
314 AVRC_TRACE_DEBUG("%s handle = %u label = %u len = %d", __func__, handle,
315 label, p_pkt->len);
316 if (p_pkt->len > AVRC_MAX_CTRL_DATA_LEN) {
317 int offset_len = MAX(AVCT_MSG_OFFSET, p_pkt->offset);
318 p_pkt_old = p_fcb->p_fmsg;
319 p_pkt = (BT_HDR*)osi_malloc(AVRC_PACKET_LEN + offset_len + BT_HDR_SIZE);
320 p_pkt->len = AVRC_MAX_CTRL_DATA_LEN;
321 p_pkt->offset = AVCT_MSG_OFFSET;
322 p_pkt->layer_specific = p_pkt_old->layer_specific;
323 p_pkt->event = p_pkt_old->event;
324 p_old = (uint8_t*)(p_pkt_old + 1) + p_pkt_old->offset;
325 p_data = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
326 memcpy(p_data, p_old, AVRC_MAX_CTRL_DATA_LEN);
327 /* use AVRC continue packet type */
328 p_data += AVRC_VENDOR_HDR_SIZE;
329 p_data++; /* pdu */
330 *p_data++ = AVRC_PKT_CONTINUE;
331 /* 4=pdu, pkt_type & len */
332 UINT16_TO_BE_STREAM(p_data,
333 (AVRC_MAX_CTRL_DATA_LEN - AVRC_VENDOR_HDR_SIZE - 4));
334
335 /* prepare the left over for as an end fragment */
336 avrc_prep_end_frag(handle);
337 } else {
338 /* end fragment. clean the control block */
339 p_fcb->frag_enabled = false;
340 p_fcb->p_fmsg = NULL;
341 }
342 return AVCT_MsgReq(handle, label, cr, p_pkt);
343 }
344
345 /******************************************************************************
346 *
347 * Function avrc_proc_vendor_command
348 *
349 * Description This function processes received vendor command.
350 *
351 * Returns if not NULL, the response to send right away.
352 *
353 *****************************************************************************/
avrc_proc_vendor_command(uint8_t handle,uint8_t label,BT_HDR * p_pkt,tAVRC_MSG_VENDOR * p_msg)354 static BT_HDR* avrc_proc_vendor_command(uint8_t handle, uint8_t label,
355 BT_HDR* p_pkt,
356 tAVRC_MSG_VENDOR* p_msg) {
357 BT_HDR* p_rsp = NULL;
358 uint8_t* p_data;
359 uint8_t* p_begin;
360 uint8_t pkt_type;
361 bool abort_frag = false;
362 tAVRC_STS status = AVRC_STS_NO_ERROR;
363 tAVRC_FRAG_CB* p_fcb;
364
365 p_begin = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
366 p_data = p_begin + AVRC_VENDOR_HDR_SIZE;
367 pkt_type = *(p_data + 1) & AVRC_PKT_TYPE_MASK;
368
369 if (pkt_type != AVRC_PKT_SINGLE) {
370 /* reject - commands can only be in single packets at AVRCP level */
371 AVRC_TRACE_ERROR("commands must be in single packet pdu:0x%x", *p_data);
372 /* use the current GKI buffer to send the reject */
373 status = AVRC_STS_BAD_CMD;
374 }
375 /* check if there are fragments waiting to be sent */
376 else if (avrc_cb.fcb[handle].frag_enabled) {
377 p_fcb = &avrc_cb.fcb[handle];
378 if (p_msg->company_id == AVRC_CO_METADATA) {
379 switch (*p_data) {
380 case AVRC_PDU_ABORT_CONTINUATION_RSP:
381 /* aborted by CT - send accept response */
382 abort_frag = true;
383 p_begin = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
384 *p_begin = (AVRC_RSP_ACCEPT & AVRC_CTYPE_MASK);
385 if (*(p_data + 4) != p_fcb->frag_pdu) {
386 *p_begin = (AVRC_RSP_REJ & AVRC_CTYPE_MASK);
387 *(p_data + 4) = AVRC_STS_BAD_PARAM;
388 } else {
389 p_data = (p_begin + AVRC_VENDOR_HDR_SIZE + 2);
390 UINT16_TO_BE_STREAM(p_data, 0);
391 p_pkt->len = (p_data - p_begin);
392 }
393 AVCT_MsgReq(handle, label, AVCT_RSP, p_pkt);
394 p_msg->hdr.opcode =
395 AVRC_OP_DROP; /* used the p_pkt to send response */
396 break;
397
398 case AVRC_PDU_REQUEST_CONTINUATION_RSP:
399 if (*(p_data + 4) == p_fcb->frag_pdu) {
400 avrc_send_continue_frag(handle, label);
401 p_msg->hdr.opcode = AVRC_OP_DROP_N_FREE;
402 } else {
403 /* the pdu id does not match - reject the command using the current
404 * GKI buffer */
405 AVRC_TRACE_ERROR(
406 "%s continue pdu: 0x%x does not match the current pdu: 0x%x",
407 __func__, *(p_data + 4), p_fcb->frag_pdu);
408 status = AVRC_STS_BAD_PARAM;
409 abort_frag = true;
410 }
411 break;
412
413 default:
414 /* implicit abort */
415 abort_frag = true;
416 }
417 } else {
418 abort_frag = true;
419 /* implicit abort */
420 }
421
422 if (abort_frag) {
423 osi_free_and_reset((void**)&p_fcb->p_fmsg);
424 p_fcb->frag_enabled = false;
425 }
426 }
427
428 if (status != AVRC_STS_NO_ERROR) {
429 p_rsp = (BT_HDR*)osi_malloc(BT_DEFAULT_BUFFER_SIZE);
430 p_rsp->offset = p_pkt->offset;
431 p_data = (uint8_t*)(p_rsp + 1) + p_pkt->offset;
432 *p_data++ = AVRC_RSP_REJ;
433 p_data += AVRC_VENDOR_HDR_SIZE; /* pdu */
434 *p_data++ = 0; /* pkt_type */
435 UINT16_TO_BE_STREAM(p_data, 1); /* len */
436 *p_data++ = status; /* error code */
437 p_rsp->len = AVRC_VENDOR_HDR_SIZE + 5;
438 }
439
440 return p_rsp;
441 }
442
443 /******************************************************************************
444 *
445 * Function avrc_proc_far_msg
446 *
447 * Description This function processes metadata fragmenation
448 * and reassembly
449 *
450 * Returns 0, to report the message with msg_cback .
451 *
452 *****************************************************************************/
avrc_proc_far_msg(uint8_t handle,uint8_t label,uint8_t cr,BT_HDR ** pp_pkt,tAVRC_MSG_VENDOR * p_msg)453 static uint8_t avrc_proc_far_msg(uint8_t handle, uint8_t label, uint8_t cr,
454 BT_HDR** pp_pkt, tAVRC_MSG_VENDOR* p_msg) {
455 BT_HDR* p_pkt = *pp_pkt;
456 uint8_t* p_data;
457 uint8_t drop_code = 0;
458 bool buf_overflow = false;
459 BT_HDR* p_rsp = NULL;
460 BT_HDR* p_cmd = NULL;
461 bool req_continue = false;
462 BT_HDR* p_pkt_new = NULL;
463 uint8_t pkt_type;
464 tAVRC_RASM_CB* p_rcb;
465 tAVRC_NEXT_CMD avrc_cmd;
466 tAVRC_STS status;
467
468 p_data = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
469
470 /* Skip over vendor header (ctype, subunit*, opcode, CO_ID) */
471 p_data += AVRC_VENDOR_HDR_SIZE;
472
473 pkt_type = *(p_data + 1) & AVRC_PKT_TYPE_MASK;
474 AVRC_TRACE_DEBUG("pkt_type %d", pkt_type);
475 p_rcb = &avrc_cb.rcb[handle];
476
477 /* check if the message needs to be re-assembled */
478 if (pkt_type == AVRC_PKT_SINGLE || pkt_type == AVRC_PKT_START) {
479 /* previous fragments need to be dropped, when received another new message
480 */
481 p_rcb->rasm_offset = 0;
482 osi_free_and_reset((void**)&p_rcb->p_rmsg);
483 }
484
485 if (pkt_type != AVRC_PKT_SINGLE && cr == AVCT_RSP) {
486 /* not a single response packet - need to re-assemble metadata messages */
487 if (pkt_type == AVRC_PKT_START) {
488 /* Allocate buffer for re-assembly */
489 p_rcb->rasm_pdu = *p_data;
490 p_rcb->p_rmsg = (BT_HDR*)osi_malloc(BT_DEFAULT_BUFFER_SIZE);
491 /* Copy START packet to buffer for re-assembling fragments */
492 memcpy(p_rcb->p_rmsg, p_pkt, sizeof(BT_HDR)); /* Copy bt hdr */
493
494 /* Copy metadata message */
495 memcpy((uint8_t*)(p_rcb->p_rmsg + 1),
496 (uint8_t*)(p_pkt + 1) + p_pkt->offset, p_pkt->len);
497
498 /* offset of start of metadata response in reassembly buffer */
499 p_rcb->p_rmsg->offset = p_rcb->rasm_offset = 0;
500
501 /*
502 * Free original START packet, replace with pointer to
503 * reassembly buffer.
504 */
505 osi_free(p_pkt);
506 *pp_pkt = p_rcb->p_rmsg;
507
508 /*
509 * Set offset to point to where to copy next - use the same
510 * reassembly logic as AVCT.
511 */
512 p_rcb->p_rmsg->offset += p_rcb->p_rmsg->len;
513 req_continue = true;
514 } else if (p_rcb->p_rmsg == NULL) {
515 /* Received a CONTINUE/END, but no corresponding START
516 (or previous fragmented response was dropped) */
517 AVRC_TRACE_DEBUG(
518 "Received a CONTINUE/END without no corresponding START \
519 (or previous fragmented response was dropped)");
520 drop_code = 5;
521 osi_free(p_pkt);
522 *pp_pkt = NULL;
523 } else {
524 /* get size of buffer holding assembled message */
525 /*
526 * NOTE: The buffer is allocated above at the beginning of the
527 * reassembly, and is always of size BT_DEFAULT_BUFFER_SIZE.
528 */
529 uint16_t buf_len = BT_DEFAULT_BUFFER_SIZE - sizeof(BT_HDR);
530 /* adjust offset and len of fragment for header byte */
531 p_pkt->offset += (AVRC_VENDOR_HDR_SIZE + AVRC_MIN_META_HDR_SIZE);
532 p_pkt->len -= (AVRC_VENDOR_HDR_SIZE + AVRC_MIN_META_HDR_SIZE);
533 /* verify length */
534 if ((p_rcb->p_rmsg->offset + p_pkt->len) > buf_len) {
535 AVRC_TRACE_WARNING(
536 "Fragmented message too big! - report the partial message");
537 p_pkt->len = buf_len - p_rcb->p_rmsg->offset;
538 pkt_type = AVRC_PKT_END;
539 buf_overflow = true;
540 }
541
542 /* copy contents of p_pkt to p_rx_msg */
543 memcpy((uint8_t*)(p_rcb->p_rmsg + 1) + p_rcb->p_rmsg->offset,
544 (uint8_t*)(p_pkt + 1) + p_pkt->offset, p_pkt->len);
545
546 if (pkt_type == AVRC_PKT_END) {
547 p_rcb->p_rmsg->offset = p_rcb->rasm_offset;
548 p_rcb->p_rmsg->len += p_pkt->len;
549 p_pkt_new = p_rcb->p_rmsg;
550 p_rcb->rasm_offset = 0;
551 p_rcb->p_rmsg = NULL;
552 p_msg->p_vendor_data = (uint8_t*)(p_pkt_new + 1) + p_pkt_new->offset;
553 p_msg->hdr.ctype = p_msg->p_vendor_data[0] & AVRC_CTYPE_MASK;
554 /* 6 = ctype, subunit*, opcode & CO_ID */
555 p_msg->p_vendor_data += AVRC_VENDOR_HDR_SIZE;
556 p_msg->vendor_len = p_pkt_new->len - AVRC_VENDOR_HDR_SIZE;
557 p_data = p_msg->p_vendor_data + 1; /* skip pdu */
558 *p_data++ = AVRC_PKT_SINGLE;
559 UINT16_TO_BE_STREAM(p_data,
560 (p_msg->vendor_len - AVRC_MIN_META_HDR_SIZE));
561 AVRC_TRACE_DEBUG("end frag:%d, total len:%d, offset:%d", p_pkt->len,
562 p_pkt_new->len, p_pkt_new->offset);
563 } else {
564 p_rcb->p_rmsg->offset += p_pkt->len;
565 p_rcb->p_rmsg->len += p_pkt->len;
566 p_pkt_new = NULL;
567 req_continue = true;
568 }
569 osi_free(p_pkt);
570 *pp_pkt = p_pkt_new;
571 }
572 }
573
574 if (cr == AVCT_CMD) {
575 p_rsp = avrc_proc_vendor_command(handle, label, *pp_pkt, p_msg);
576 if (p_rsp) {
577 AVCT_MsgReq(handle, label, AVCT_RSP, p_rsp);
578 osi_free_and_reset((void**)pp_pkt);
579 drop_code = 3;
580 } else if (p_msg->hdr.opcode == AVRC_OP_DROP) {
581 drop_code = 1;
582 } else if (p_msg->hdr.opcode == AVRC_OP_DROP_N_FREE)
583 drop_code = 4;
584
585 } else if (cr == AVCT_RSP) {
586 if (req_continue) {
587 avrc_cmd.pdu = AVRC_PDU_REQUEST_CONTINUATION_RSP;
588 drop_code = 2;
589 } else if (buf_overflow) {
590 /* Incoming message too big to fit in BT_DEFAULT_BUFFER_SIZE. Send abort
591 * to peer */
592 avrc_cmd.pdu = AVRC_PDU_ABORT_CONTINUATION_RSP;
593 drop_code = 4;
594 } else {
595 return drop_code;
596 }
597 avrc_cmd.status = AVRC_STS_NO_ERROR;
598 avrc_cmd.target_pdu = p_rcb->rasm_pdu;
599
600 tAVRC_COMMAND avrc_command;
601 avrc_command.continu = avrc_cmd;
602 status = AVRC_BldCommand(&avrc_command, &p_cmd);
603 if (status == AVRC_STS_NO_ERROR) {
604 AVRC_MsgReq(handle, (uint8_t)(label), AVRC_CMD_CTRL, p_cmd);
605 }
606 }
607
608 return drop_code;
609 }
610
611 /******************************************************************************
612 *
613 * Function avrc_msg_cback
614 *
615 * Description This is the callback function used by AVCTP to report
616 * received AV control messages.
617 *
618 * Returns Nothing.
619 *
620 *****************************************************************************/
avrc_msg_cback(uint8_t handle,uint8_t label,uint8_t cr,BT_HDR * p_pkt)621 static void avrc_msg_cback(uint8_t handle, uint8_t label, uint8_t cr,
622 BT_HDR* p_pkt) {
623 uint8_t opcode;
624 tAVRC_MSG msg;
625 uint8_t* p_data;
626 uint8_t* p_begin;
627 bool drop = false;
628 bool do_free = true;
629 BT_HDR* p_rsp = NULL;
630 uint8_t* p_rsp_data;
631 int xx;
632 bool reject = false;
633 const char* p_drop_msg = "dropped";
634 tAVRC_MSG_VENDOR* p_msg = &msg.vendor;
635
636 if (cr == AVCT_CMD && (p_pkt->layer_specific & AVCT_DATA_CTRL &&
637 AVRC_PACKET_LEN < sizeof(p_pkt->len))) {
638 /* Ignore the invalid AV/C command frame */
639 p_drop_msg = "dropped - too long AV/C cmd frame size";
640 osi_free(p_pkt);
641 return;
642 }
643
644 if (cr == AVCT_REJ) {
645 /* The peer thinks that this PID is no longer open - remove this handle */
646 /* */
647 osi_free(p_pkt);
648 AVCT_RemoveConn(handle);
649 return;
650 } else if (cr == AVCT_RSP) {
651 /* Received response. Stop command timeout timer */
652 AVRC_TRACE_DEBUG("AVRC: stopping timer (handle=0x%02x)", handle);
653 alarm_cancel(avrc_cb.ccb_int[handle].tle);
654 }
655
656 p_data = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
657 memset(&msg, 0, sizeof(tAVRC_MSG));
658
659 if (p_pkt->layer_specific == AVCT_DATA_BROWSE) {
660 opcode = AVRC_OP_BROWSE;
661 msg.browse.hdr.ctype = cr;
662 msg.browse.p_browse_data = p_data;
663 msg.browse.browse_len = p_pkt->len;
664 msg.browse.p_browse_pkt = p_pkt;
665 } else {
666 if (p_pkt->len < AVRC_AVC_HDR_SIZE) {
667 android_errorWriteLog(0x534e4554, "111803925");
668 AVRC_TRACE_WARNING("%s: message length %d too short: must be at least %d",
669 __func__, p_pkt->len, AVRC_AVC_HDR_SIZE);
670 osi_free(p_pkt);
671 return;
672 }
673 msg.hdr.ctype = p_data[0] & AVRC_CTYPE_MASK;
674 AVRC_TRACE_DEBUG("%s handle:%d, ctype:%d, offset:%d, len: %d", __func__,
675 handle, msg.hdr.ctype, p_pkt->offset, p_pkt->len);
676 msg.hdr.subunit_type =
677 (p_data[1] & AVRC_SUBTYPE_MASK) >> AVRC_SUBTYPE_SHIFT;
678 msg.hdr.subunit_id = p_data[1] & AVRC_SUBID_MASK;
679 opcode = p_data[2];
680 }
681
682 if (((avrc_cb.ccb[handle].control & AVRC_CT_TARGET) && (cr == AVCT_CMD)) ||
683 ((avrc_cb.ccb[handle].control & AVRC_CT_CONTROL) && (cr == AVCT_RSP))) {
684 switch (opcode) {
685 case AVRC_OP_UNIT_INFO:
686 if (cr == AVCT_CMD) {
687 /* send the response to the peer */
688 p_rsp = avrc_copy_packet(p_pkt, AVRC_OP_UNIT_INFO_RSP_LEN);
689 p_rsp_data = avrc_get_data_ptr(p_rsp);
690 *p_rsp_data = AVRC_RSP_IMPL_STBL;
691 /* check & set the offset. set response code, set subunit_type &
692 subunit_id,
693 set AVRC_OP_UNIT_INFO */
694 /* 3 bytes: ctype, subunit*, opcode */
695 p_rsp_data += AVRC_AVC_HDR_SIZE;
696 *p_rsp_data++ = 7;
697 /* Panel subunit & id=0 */
698 *p_rsp_data++ = (AVRC_SUB_PANEL << AVRC_SUBTYPE_SHIFT);
699 AVRC_CO_ID_TO_BE_STREAM(p_rsp_data, avrc_cb.ccb[handle].company_id);
700 p_rsp->len =
701 (uint16_t)(p_rsp_data - (uint8_t*)(p_rsp + 1) - p_rsp->offset);
702 cr = AVCT_RSP;
703 p_drop_msg = "auto respond";
704 } else {
705 /* parse response */
706 if (p_pkt->len < AVRC_OP_UNIT_INFO_RSP_LEN) {
707 AVRC_TRACE_WARNING(
708 "%s: message length %d too short: must be at least %d",
709 __func__, p_pkt->len, AVRC_OP_UNIT_INFO_RSP_LEN);
710 android_errorWriteLog(0x534e4554, "79883824");
711 drop = true;
712 p_drop_msg = "UNIT_INFO_RSP too short";
713 break;
714 }
715 p_data += 4; /* 3 bytes: ctype, subunit*, opcode + octet 3 (is 7)*/
716 msg.unit.unit_type =
717 (*p_data & AVRC_SUBTYPE_MASK) >> AVRC_SUBTYPE_SHIFT;
718 msg.unit.unit = *p_data & AVRC_SUBID_MASK;
719 p_data++;
720 AVRC_BE_STREAM_TO_CO_ID(msg.unit.company_id, p_data);
721 }
722 break;
723
724 case AVRC_OP_SUB_INFO:
725 if (cr == AVCT_CMD) {
726 /* send the response to the peer */
727 p_rsp = avrc_copy_packet(p_pkt, AVRC_OP_SUB_UNIT_INFO_RSP_LEN);
728 p_rsp_data = avrc_get_data_ptr(p_rsp);
729 *p_rsp_data = AVRC_RSP_IMPL_STBL;
730 /* check & set the offset. set response code, set (subunit_type &
731 subunit_id),
732 set AVRC_OP_SUB_INFO, set (page & extention code) */
733 p_rsp_data += 4;
734 /* Panel subunit & id=0 */
735 *p_rsp_data++ = (AVRC_SUB_PANEL << AVRC_SUBTYPE_SHIFT);
736 memset(p_rsp_data, AVRC_CMD_OPRND_PAD, AVRC_SUBRSP_OPRND_BYTES);
737 p_rsp_data += AVRC_SUBRSP_OPRND_BYTES;
738 p_rsp->len =
739 (uint16_t)(p_rsp_data - (uint8_t*)(p_rsp + 1) - p_rsp->offset);
740 cr = AVCT_RSP;
741 p_drop_msg = "auto responded";
742 } else {
743 /* parse response */
744 if (p_pkt->len < AVRC_OP_SUB_UNIT_INFO_RSP_LEN) {
745 AVRC_TRACE_WARNING(
746 "%s: message length %d too short: must be at least %d",
747 __func__, p_pkt->len, AVRC_OP_SUB_UNIT_INFO_RSP_LEN);
748 android_errorWriteLog(0x534e4554, "79883824");
749 drop = true;
750 p_drop_msg = "SUB_UNIT_INFO_RSP too short";
751 break;
752 }
753 p_data += AVRC_AVC_HDR_SIZE; /* 3 bytes: ctype, subunit*, opcode */
754 msg.sub.page =
755 (*p_data++ >> AVRC_SUB_PAGE_SHIFT) & AVRC_SUB_PAGE_MASK;
756 xx = 0;
757 while (*p_data != AVRC_CMD_OPRND_PAD && xx < AVRC_SUB_TYPE_LEN) {
758 msg.sub.subunit_type[xx] = *p_data++ >> AVRC_SUBTYPE_SHIFT;
759 if (msg.sub.subunit_type[xx] == AVRC_SUB_PANEL)
760 msg.sub.panel = true;
761 xx++;
762 }
763 }
764 break;
765
766 case AVRC_OP_VENDOR: {
767 p_data = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
768 p_begin = p_data;
769 if (p_pkt->len <
770 AVRC_VENDOR_HDR_SIZE) /* 6 = ctype, subunit*, opcode & CO_ID */
771 {
772 if (cr == AVCT_CMD)
773 reject = true;
774 else
775 drop = true;
776 break;
777 }
778 p_data += AVRC_AVC_HDR_SIZE; /* skip the first 3 bytes: ctype, subunit*,
779 opcode */
780 AVRC_BE_STREAM_TO_CO_ID(p_msg->company_id, p_data);
781 p_msg->p_vendor_data = p_data;
782 p_msg->vendor_len = p_pkt->len - (p_data - p_begin);
783
784 uint8_t drop_code = 0;
785 if (p_msg->company_id == AVRC_CO_METADATA) {
786 /* Validate length for metadata message */
787 if (p_pkt->len < (AVRC_VENDOR_HDR_SIZE + AVRC_MIN_META_HDR_SIZE)) {
788 if (cr == AVCT_CMD)
789 reject = true;
790 else
791 drop = true;
792 break;
793 }
794
795 /* Check+handle fragmented messages */
796 drop_code = avrc_proc_far_msg(handle, label, cr, &p_pkt, p_msg);
797 if (drop_code > 0) drop = true;
798 }
799 if (drop_code > 0) {
800 if (drop_code != 4) do_free = false;
801 switch (drop_code) {
802 case 1:
803 p_drop_msg = "sent_frag";
804 break;
805 case 2:
806 p_drop_msg = "req_cont";
807 break;
808 case 3:
809 p_drop_msg = "sent_frag3";
810 break;
811 case 4:
812 p_drop_msg = "sent_frag_free";
813 break;
814 default:
815 p_drop_msg = "sent_fragd";
816 }
817 }
818 /* If vendor response received, and did not ask for continuation */
819 /* then check queue for addition commands to send */
820 if ((cr == AVCT_RSP) && (drop_code != 2)) {
821 avrc_send_next_vendor_cmd(handle);
822 }
823 } break;
824
825 case AVRC_OP_PASS_THRU:
826 if (p_pkt->len < 5) /* 3 bytes: ctype, subunit*, opcode & op_id & len */
827 {
828 if (cr == AVCT_CMD)
829 reject = true;
830 else
831 drop = true;
832 break;
833 }
834 p_data += AVRC_AVC_HDR_SIZE; /* skip the first 3 bytes: ctype, subunit*,
835 opcode */
836 msg.pass.op_id = (AVRC_PASS_OP_ID_MASK & *p_data);
837 if (AVRC_PASS_STATE_MASK & *p_data)
838 msg.pass.state = true;
839 else
840 msg.pass.state = false;
841 p_data++;
842 msg.pass.pass_len = *p_data++;
843 if (msg.pass.pass_len != p_pkt->len - 5)
844 msg.pass.pass_len = p_pkt->len - 5;
845 if (msg.pass.pass_len)
846 msg.pass.p_pass_data = p_data;
847 else
848 msg.pass.p_pass_data = NULL;
849 break;
850
851 case AVRC_OP_BROWSE:
852 /* If browse response received, then check queue for addition commands
853 * to send */
854 if (cr == AVCT_RSP) {
855 avrc_send_next_vendor_cmd(handle);
856 }
857 break;
858
859 default:
860 if ((avrc_cb.ccb[handle].control & AVRC_CT_TARGET) &&
861 (cr == AVCT_CMD)) {
862 /* reject unsupported opcode */
863 reject = true;
864 }
865 drop = true;
866 break;
867 }
868 } else /* drop the event */
869 {
870 if (opcode != AVRC_OP_BROWSE) drop = true;
871 }
872
873 if (reject) {
874 /* reject unsupported opcode */
875 p_rsp = avrc_copy_packet(p_pkt, AVRC_OP_REJ_MSG_LEN);
876 p_rsp_data = avrc_get_data_ptr(p_rsp);
877 *p_rsp_data = AVRC_RSP_REJ;
878 p_drop_msg = "rejected";
879 cr = AVCT_RSP;
880 drop = true;
881 }
882
883 if (p_rsp) {
884 /* set to send response right away */
885 AVCT_MsgReq(handle, label, cr, p_rsp);
886 drop = true;
887 }
888
889 if (!drop) {
890 msg.hdr.opcode = opcode;
891 avrc_cb.ccb[handle].msg_cback.Run(handle, label, opcode, &msg);
892 } else {
893 AVRC_TRACE_WARNING("%s %s msg handle:%d, control:%d, cr:%d, opcode:x%x",
894 __func__, p_drop_msg, handle,
895 avrc_cb.ccb[handle].control, cr, opcode);
896 }
897
898 if (opcode == AVRC_OP_BROWSE && msg.browse.p_browse_pkt == NULL) {
899 do_free = false;
900 }
901
902 if (do_free) osi_free(p_pkt);
903 }
904
905 /******************************************************************************
906 *
907 * Function avrc_pass_msg
908 *
909 * Description Compose a PASS THROUGH command according to p_msg
910 *
911 * Input Parameters:
912 * p_msg: Pointer to PASS THROUGH message structure.
913 *
914 * Output Parameters:
915 * None.
916 *
917 * Returns pointer to a valid GKI buffer if successful.
918 * NULL if p_msg is NULL.
919 *
920 *****************************************************************************/
avrc_pass_msg(tAVRC_MSG_PASS * p_msg)921 static BT_HDR* avrc_pass_msg(tAVRC_MSG_PASS* p_msg) {
922 CHECK(p_msg != NULL);
923 CHECK(AVRC_CMD_BUF_SIZE > (AVRC_MIN_CMD_LEN + p_msg->pass_len));
924
925 BT_HDR* p_cmd = (BT_HDR*)osi_malloc(AVRC_CMD_BUF_SIZE);
926 p_cmd->offset = AVCT_MSG_OFFSET;
927 p_cmd->layer_specific = AVCT_DATA_CTRL;
928
929 uint8_t* p_data = (uint8_t*)(p_cmd + 1) + p_cmd->offset;
930 *p_data++ = (p_msg->hdr.ctype & AVRC_CTYPE_MASK);
931 *p_data++ = (AVRC_SUB_PANEL << AVRC_SUBTYPE_SHIFT); /* Panel subunit & id=0 */
932 *p_data++ = AVRC_OP_PASS_THRU;
933 *p_data = (AVRC_PASS_OP_ID_MASK & p_msg->op_id);
934 if (p_msg->state) *p_data |= AVRC_PASS_STATE_MASK;
935 p_data++;
936
937 if (p_msg->op_id == AVRC_ID_VENDOR) {
938 *p_data++ = p_msg->pass_len;
939 if (p_msg->pass_len && p_msg->p_pass_data) {
940 memcpy(p_data, p_msg->p_pass_data, p_msg->pass_len);
941 p_data += p_msg->pass_len;
942 }
943 } else {
944 /* set msg len to 0 for other op_id */
945 *p_data++ = 0;
946 }
947 p_cmd->len = (uint16_t)(p_data - (uint8_t*)(p_cmd + 1) - p_cmd->offset);
948
949 return p_cmd;
950 }
951
952 /******************************************************************************
953 *
954 * Function AVRC_Open
955 *
956 * Description This function is called to open a connection to AVCTP.
957 * The connection can be either an initiator or acceptor, as
958 * determined by the p_ccb->stream parameter.
959 * The connection can be a target, a controller or for both
960 * role, as determined by the p_ccb->control parameter.
961 * By definition, a target connection is an acceptor connection
962 * that waits for an incoming AVCTP connection from the peer.
963 * The connection remains available to the application until
964 * the application closes it by calling AVRC_Close(). The
965 * application does not need to reopen the connection after an
966 * AVRC_CLOSE_IND_EVT is received.
967 *
968 * Input Parameters:
969 * p_ccb->company_id: Company Identifier.
970 *
971 * p_ccb->p_ctrl_cback: Pointer to control callback
972 * function.
973 *
974 * p_ccb->p_msg_cback: Pointer to message callback
975 * function.
976 *
977 * p_ccb->conn: AVCTP connection role. This is set to
978 * AVCTP_INT for initiator connections and AVCTP_ACP
979 * for acceptor connections.
980 *
981 * p_ccb->control: Control role. This is set to
982 * AVRC_CT_TARGET for target connections, AVRC_CT_CONTROL
983 * for control connections or
984 * (AVRC_CT_TARGET|AVRC_CT_CONTROL)
985 * for connections that support both roles.
986 *
987 * peer_addr: BD address of peer device. This value is
988 * only used for initiator connections; for acceptor
989 * connections it can be set to NULL.
990 *
991 * Output Parameters:
992 * p_handle: Pointer to handle. This parameter is only
993 * valid if AVRC_SUCCESS is returned.
994 *
995 * Returns AVRC_SUCCESS if successful.
996 * AVRC_NO_RESOURCES if there are not enough resources to open
997 * the connection.
998 *
999 *****************************************************************************/
AVRC_Open(uint8_t * p_handle,tAVRC_CONN_CB * p_ccb,const RawAddress & peer_addr)1000 uint16_t AVRC_Open(uint8_t* p_handle, tAVRC_CONN_CB* p_ccb,
1001 const RawAddress& peer_addr) {
1002 uint16_t status;
1003 tAVCT_CC cc;
1004
1005 cc.p_ctrl_cback = avrc_ctrl_cback; /* Control callback */
1006 cc.p_msg_cback = avrc_msg_cback; /* Message callback */
1007 cc.pid = UUID_SERVCLASS_AV_REMOTE_CONTROL; /* Profile ID */
1008 cc.role = p_ccb->conn; /* Initiator/acceptor role */
1009 cc.control = p_ccb->control; /* Control role (Control/Target) */
1010
1011 status = AVCT_CreateConn(p_handle, &cc, peer_addr);
1012 if (status == AVCT_SUCCESS) {
1013 avrc_cb.ccb[*p_handle] = *p_ccb;
1014 memset(&avrc_cb.ccb_int[*p_handle], 0, sizeof(tAVRC_CONN_INT_CB));
1015 memset(&avrc_cb.fcb[*p_handle], 0, sizeof(tAVRC_FRAG_CB));
1016 memset(&avrc_cb.rcb[*p_handle], 0, sizeof(tAVRC_RASM_CB));
1017 avrc_cb.ccb_int[*p_handle].tle = alarm_new("avrcp.commandTimer");
1018 avrc_cb.ccb_int[*p_handle].cmd_q = fixed_queue_new(SIZE_MAX);
1019 }
1020 AVRC_TRACE_DEBUG("%s role: %d, control:%d status:%d, handle:%d", __func__,
1021 cc.role, cc.control, status, *p_handle);
1022
1023 return status;
1024 }
1025
1026 /******************************************************************************
1027 *
1028 * Function AVRC_Close
1029 *
1030 * Description Close a connection opened with AVRC_Open().
1031 * This function is called when the
1032 * application is no longer using a connection.
1033 *
1034 * Input Parameters:
1035 * handle: Handle of this connection.
1036 *
1037 * Output Parameters:
1038 * None.
1039 *
1040 * Returns AVRC_SUCCESS if successful.
1041 * AVRC_BAD_HANDLE if handle is invalid.
1042 *
1043 *****************************************************************************/
AVRC_Close(uint8_t handle)1044 uint16_t AVRC_Close(uint8_t handle) {
1045 AVRC_TRACE_DEBUG("%s handle:%d", __func__, handle);
1046 avrc_flush_cmd_q(handle);
1047 return AVCT_RemoveConn(handle);
1048 }
1049
1050 /******************************************************************************
1051 *
1052 * Function AVRC_OpenBrowse
1053 *
1054 * Description This function is called to open a browsing connection to
1055 * AVCTP. The connection can be either an initiator or
1056 * acceptor, as determined by the p_conn_role.
1057 * The handle is returned by a previous call to AVRC_Open.
1058 *
1059 * Returns AVRC_SUCCESS if successful.
1060 * AVRC_NO_RESOURCES if there are not enough resources to open
1061 * the connection.
1062 *
1063 *****************************************************************************/
AVRC_OpenBrowse(uint8_t handle,uint8_t conn_role)1064 uint16_t AVRC_OpenBrowse(uint8_t handle, uint8_t conn_role) {
1065 return AVCT_CreateBrowse(handle, conn_role);
1066 }
1067
1068 /******************************************************************************
1069 *
1070 * Function AVRC_CloseBrowse
1071 *
1072 * Description Close a connection opened with AVRC_OpenBrowse().
1073 * This function is called when the
1074 * application is no longer using a connection.
1075 *
1076 * Returns AVRC_SUCCESS if successful.
1077 * AVRC_BAD_HANDLE if handle is invalid.
1078 *
1079 *****************************************************************************/
AVRC_CloseBrowse(uint8_t handle)1080 uint16_t AVRC_CloseBrowse(uint8_t handle) { return AVCT_RemoveBrowse(handle); }
1081
1082 /******************************************************************************
1083 *
1084 * Function AVRC_MsgReq
1085 *
1086 * Description This function is used to send the AVRCP byte stream in p_pkt
1087 * down to AVCTP.
1088 *
1089 * It is expected that p_pkt->offset is at least
1090 * AVCT_MSG_OFFSET
1091 * p_pkt->layer_specific is AVCT_DATA_CTRL or AVCT_DATA_BROWSE
1092 * p_pkt->event is AVRC_OP_VENDOR, AVRC_OP_PASS_THRU or
1093 * AVRC_OP_BROWSE
1094 * The above BT_HDR settings are set by the AVRC_Bld*
1095 * functions.
1096 *
1097 * Returns AVRC_SUCCESS if successful.
1098 * AVRC_BAD_HANDLE if handle is invalid.
1099 *
1100 *****************************************************************************/
AVRC_MsgReq(uint8_t handle,uint8_t label,uint8_t ctype,BT_HDR * p_pkt)1101 uint16_t AVRC_MsgReq(uint8_t handle, uint8_t label, uint8_t ctype,
1102 BT_HDR* p_pkt) {
1103 uint8_t* p_data;
1104 uint8_t cr = AVCT_CMD;
1105 bool chk_frag = true;
1106 uint8_t* p_start = NULL;
1107 tAVRC_FRAG_CB* p_fcb;
1108 uint16_t len;
1109 uint16_t status;
1110 uint8_t msg_mask = 0;
1111 uint16_t peer_mtu;
1112
1113 if (!p_pkt) return AVRC_BAD_PARAM;
1114
1115 AVRC_TRACE_DEBUG("%s handle = %u label = %u ctype = %u len = %d", __func__,
1116 handle, label, ctype, p_pkt->len);
1117 /* Handle for AVRCP fragment */
1118 bool is_new_avrcp = osi_property_get_bool("persist.bluetooth.enablenewavrcp", true);
1119 if (ctype >= AVRC_RSP_NOT_IMPL) cr = AVCT_RSP;
1120
1121 if (p_pkt->event == AVRC_OP_VENDOR) {
1122 if (is_new_avrcp) {
1123 p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset + AVRC_VENDOR_HDR_SIZE;
1124 } else {
1125 /* add AVRCP Vendor Dependent headers */
1126 p_start = ((uint8_t*)(p_pkt + 1) + p_pkt->offset);
1127 p_pkt->offset -= AVRC_VENDOR_HDR_SIZE;
1128 p_pkt->len += AVRC_VENDOR_HDR_SIZE;
1129 p_data = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
1130 *p_data++ = (ctype & AVRC_CTYPE_MASK);
1131 *p_data++ = (AVRC_SUB_PANEL << AVRC_SUBTYPE_SHIFT);
1132 *p_data++ = AVRC_OP_VENDOR;
1133 AVRC_CO_ID_TO_BE_STREAM(p_data, AVRC_CO_METADATA);
1134
1135 /* Check if this is a AVRC_PDU_REQUEST_CONTINUATION_RSP */
1136 if (cr == AVCT_CMD) {
1137 msg_mask |= AVRC_MSG_MASK_IS_VENDOR_CMD;
1138
1139 if ((*p_start == AVRC_PDU_REQUEST_CONTINUATION_RSP) ||
1140 (*p_start == AVRC_PDU_ABORT_CONTINUATION_RSP)) {
1141 msg_mask |= AVRC_MSG_MASK_IS_CONTINUATION_RSP;
1142 }
1143 }
1144 }
1145 } else if (p_pkt->event == AVRC_OP_PASS_THRU) {
1146 /* add AVRCP Pass Through headers */
1147 p_start = ((uint8_t*)(p_pkt + 1) + p_pkt->offset);
1148 p_pkt->offset -= AVRC_PASS_THRU_SIZE;
1149 p_pkt->len += AVRC_PASS_THRU_SIZE;
1150 p_data = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
1151 *p_data++ = (ctype & AVRC_CTYPE_MASK);
1152 *p_data++ = (AVRC_SUB_PANEL << AVRC_SUBTYPE_SHIFT);
1153 *p_data++ = AVRC_OP_PASS_THRU; /* opcode */
1154 *p_data++ = AVRC_ID_VENDOR; /* operation id */
1155 *p_data++ = 5; /* operation data len */
1156 AVRC_CO_ID_TO_BE_STREAM(p_data, AVRC_CO_METADATA);
1157 } else {
1158 chk_frag = false;
1159 if (p_pkt->layer_specific == AVCT_DATA_BROWSE) {
1160 peer_mtu = AVCT_GetBrowseMtu(handle);
1161 } else {
1162 peer_mtu = AVCT_GetPeerMtu(handle);
1163 }
1164 if (p_pkt->len > (peer_mtu - AVCT_HDR_LEN_SINGLE)) {
1165 AVRC_TRACE_ERROR(
1166 "%s bigger than peer mtu (p_pkt->len(%d) > peer_mtu(%d-%d))",
1167 __func__, p_pkt->len, peer_mtu, AVCT_HDR_LEN_SINGLE);
1168 osi_free(p_pkt);
1169 return AVRC_MSG_TOO_BIG;
1170 }
1171 }
1172
1173 /* abandon previous fragments */
1174 p_fcb = &avrc_cb.fcb[handle];
1175
1176 if (p_fcb == NULL) {
1177 AVRC_TRACE_ERROR("%s p_fcb is NULL", __func__);
1178 osi_free(p_pkt);
1179 return AVRC_NOT_OPEN;
1180 }
1181
1182 if (p_fcb->frag_enabled) p_fcb->frag_enabled = false;
1183
1184 osi_free_and_reset((void**)&p_fcb->p_fmsg);
1185
1186 /* AVRCP spec has not defined any control channel commands that needs
1187 * fragmentation at this level
1188 * check for fragmentation only on the response */
1189 if ((cr == AVCT_RSP) && (chk_frag)) {
1190 if (p_pkt->len > AVRC_MAX_CTRL_DATA_LEN) {
1191 int offset_len = MAX(AVCT_MSG_OFFSET, p_pkt->offset);
1192 BT_HDR* p_pkt_new =
1193 (BT_HDR*)osi_malloc(AVRC_PACKET_LEN + offset_len + BT_HDR_SIZE);
1194 if (p_start != NULL) {
1195 p_fcb->frag_enabled = true;
1196 p_fcb->p_fmsg = p_pkt;
1197 p_fcb->frag_pdu = *p_start;
1198 p_pkt = p_pkt_new;
1199 p_pkt_new = p_fcb->p_fmsg;
1200 p_pkt->len = AVRC_MAX_CTRL_DATA_LEN;
1201 p_pkt->offset = p_pkt_new->offset;
1202 p_pkt->layer_specific = p_pkt_new->layer_specific;
1203 p_pkt->event = p_pkt_new->event;
1204 p_data = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
1205 p_start -= AVRC_VENDOR_HDR_SIZE;
1206 memcpy(p_data, p_start, AVRC_MAX_CTRL_DATA_LEN);
1207 /* use AVRC start packet type */
1208 p_data += AVRC_VENDOR_HDR_SIZE;
1209 p_data++; /* pdu */
1210 *p_data++ = AVRC_PKT_START;
1211
1212 /* 4 pdu, pkt_type & len */
1213 len = (AVRC_MAX_CTRL_DATA_LEN - AVRC_VENDOR_HDR_SIZE -
1214 AVRC_MIN_META_HDR_SIZE);
1215 UINT16_TO_BE_STREAM(p_data, len);
1216
1217 /* prepare the left over for as an end fragment */
1218 avrc_prep_end_frag(handle);
1219 AVRC_TRACE_DEBUG("%s p_pkt len:%d/%d, next len:%d", __func__,
1220 p_pkt->len, len, p_fcb->p_fmsg->len);
1221 } else {
1222 /* TODO: Is this "else" block valid? Remove it? */
1223 AVRC_TRACE_ERROR("%s no buffers for fragmentation", __func__);
1224 osi_free(p_pkt);
1225 return AVRC_NO_RESOURCES;
1226 }
1227 }
1228 } else if ((p_pkt->event == AVRC_OP_VENDOR) && (cr == AVCT_CMD) &&
1229 (avrc_cb.ccb_int[handle].flags & AVRC_CB_FLAGS_RSP_PENDING) &&
1230 !(msg_mask & AVRC_MSG_MASK_IS_CONTINUATION_RSP)) {
1231 /* If we are sending a vendor specific command, and a response is pending,
1232 * then enqueue the command until the response has been received.
1233 * This is to interop with TGs that abort sending responses whenever a new
1234 * command
1235 * is received (exception is continuation request command
1236 * must sent that to get additional response frags) */
1237 AVRC_TRACE_DEBUG(
1238 "AVRC: Enqueuing command 0x%08x (handle=0x%02x, label=0x%02x)", p_pkt,
1239 handle, label);
1240
1241 /* label in BT_HDR (will need this later when the command is dequeued) */
1242 p_pkt->layer_specific = (label << 8) | (p_pkt->layer_specific & 0xFF);
1243
1244 /* Enqueue the command */
1245 fixed_queue_enqueue(avrc_cb.ccb_int[handle].cmd_q, p_pkt);
1246 return AVRC_SUCCESS;
1247 }
1248
1249 /* Send the message */
1250 status = AVCT_MsgReq(handle, label, cr, p_pkt);
1251 if ((status == AVCT_SUCCESS) && (cr == AVCT_CMD)) {
1252 /* If a command was successfully sent, indicate that a response is pending
1253 */
1254 avrc_cb.ccb_int[handle].flags |= AVRC_CB_FLAGS_RSP_PENDING;
1255
1256 /* Start command timer to wait for response */
1257 avrc_start_cmd_timer(handle, label, msg_mask);
1258 }
1259
1260 return status;
1261 }
1262
1263 /******************************************************************************
1264 *
1265 * Function AVRC_PassCmd
1266 *
1267 * Description Send a PASS THROUGH command to the peer device. This
1268 * function can only be called for controller role connections.
1269 * Any response message from the peer is passed back through
1270 * the tAVRC_MSG_CBACK callback function.
1271 *
1272 * Input Parameters:
1273 * handle: Handle of this connection.
1274 *
1275 * label: Transaction label.
1276 *
1277 * p_msg: Pointer to PASS THROUGH message structure.
1278 *
1279 * Output Parameters:
1280 * None.
1281 *
1282 * Returns AVRC_SUCCESS if successful.
1283 * AVRC_BAD_HANDLE if handle is invalid.
1284 *
1285 *****************************************************************************/
AVRC_PassCmd(uint8_t handle,uint8_t label,tAVRC_MSG_PASS * p_msg)1286 uint16_t AVRC_PassCmd(uint8_t handle, uint8_t label, tAVRC_MSG_PASS* p_msg) {
1287 BT_HDR* p_buf;
1288 uint16_t status = AVRC_NO_RESOURCES;
1289 if (!p_msg) return AVRC_BAD_PARAM;
1290
1291 p_msg->hdr.ctype = AVRC_CMD_CTRL;
1292 p_buf = avrc_pass_msg(p_msg);
1293 if (p_buf) {
1294 status = AVCT_MsgReq(handle, label, AVCT_CMD, p_buf);
1295 if (status == AVCT_SUCCESS) {
1296 /* Start command timer to wait for response */
1297 avrc_start_cmd_timer(handle, label, 0);
1298 }
1299 }
1300 return (status);
1301 }
1302
1303 /******************************************************************************
1304 *
1305 * Function AVRC_PassRsp
1306 *
1307 * Description Send a PASS THROUGH response to the peer device. This
1308 * function can only be called for target role connections.
1309 * This function must be called when a PASS THROUGH command
1310 * message is received from the peer through the
1311 * tAVRC_MSG_CBACK callback function.
1312 *
1313 * Input Parameters:
1314 * handle: Handle of this connection.
1315 *
1316 * label: Transaction label. Must be the same value as
1317 * passed with the command message in the callback
1318 * function.
1319 *
1320 * p_msg: Pointer to PASS THROUGH message structure.
1321 *
1322 * Output Parameters:
1323 * None.
1324 *
1325 * Returns AVRC_SUCCESS if successful.
1326 * AVRC_BAD_HANDLE if handle is invalid.
1327 *
1328 *****************************************************************************/
AVRC_PassRsp(uint8_t handle,uint8_t label,tAVRC_MSG_PASS * p_msg)1329 uint16_t AVRC_PassRsp(uint8_t handle, uint8_t label, tAVRC_MSG_PASS* p_msg) {
1330 BT_HDR* p_buf;
1331 if (!p_msg) return AVRC_BAD_PARAM;
1332
1333 p_buf = avrc_pass_msg(p_msg);
1334 if (p_buf) return AVCT_MsgReq(handle, label, AVCT_RSP, p_buf);
1335 return AVRC_NO_RESOURCES;
1336 }
1337