1/******************************************************************************
2 *
3 *  Copyright (C) 2006-2013 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#include <string.h>
19
20#include "gki.h"
21#include "avrc_api.h"
22#include "avrc_defs.h"
23#include "avrc_int.h"
24
25/*****************************************************************************
26**  Global data
27*****************************************************************************/
28
29
30#if (AVRC_METADATA_INCLUDED == TRUE)
31/*******************************************************************************
32**
33** Function         avrc_bld_next_cmd
34**
35** Description      This function builds the Request Continue or Abort command.
36**
37** Returns          AVRC_STS_NO_ERROR, if the command is built successfully
38**                  Otherwise, the error code.
39**
40*******************************************************************************/
41static tAVRC_STS avrc_bld_next_cmd (tAVRC_NEXT_CMD *p_cmd, BT_HDR *p_pkt)
42{
43    UINT8   *p_data, *p_start;
44
45    AVRC_TRACE_API0("avrc_bld_next_cmd");
46
47    /* get the existing length, if any, and also the num attributes */
48    p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
49    p_data = p_start + 2; /* pdu + rsvd */
50
51    /* add fixed lenth 1 - pdu_id (1) */
52    UINT16_TO_BE_STREAM(p_data, 1);
53    UINT8_TO_BE_STREAM(p_data, p_cmd->target_pdu);
54    p_pkt->len = (p_data - p_start);
55
56    return AVRC_STS_NO_ERROR;
57}
58
59/*****************************************************************************
60**  the following commands are introduced in AVRCP 1.4
61*****************************************************************************/
62
63#if (AVRC_ADV_CTRL_INCLUDED == TRUE)
64/*******************************************************************************
65**
66** Function         avrc_bld_set_abs_volume_cmd
67**
68** Description      This function builds the Set Absolute Volume command.
69**
70** Returns          AVRC_STS_NO_ERROR, if the command is built successfully
71**                  Otherwise, the error code.
72**
73*******************************************************************************/
74static tAVRC_STS avrc_bld_set_abs_volume_cmd (tAVRC_SET_VOLUME_CMD *p_cmd, BT_HDR *p_pkt)
75{
76    UINT8   *p_data, *p_start;
77
78    AVRC_TRACE_API0("avrc_bld_set_abs_volume_cmd");
79    /* get the existing length, if any, and also the num attributes */
80    p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
81    p_data = p_start + 2; /* pdu + rsvd */
82    /* add fixed lenth 1 - volume (1) */
83    UINT16_TO_BE_STREAM(p_data, 1);
84    UINT8_TO_BE_STREAM(p_data, (AVRC_MAX_VOLUME & p_cmd->volume));
85    p_pkt->len = (p_data - p_start);
86    return AVRC_STS_NO_ERROR;
87}
88
89/*******************************************************************************
90**
91** Function         avrc_bld_vol_change_notfn
92**
93** Description      This function builds the register notification for volume change.
94**
95** Returns          AVRC_STS_NO_ERROR, if the command is built successfully
96**                  Otherwise, the error code.
97**
98*******************************************************************************/
99static tAVRC_STS avrc_bld_vol_change_notfn(BT_HDR * p_pkt)
100{
101    UINT8   *p_data, *p_start;
102
103    AVRC_TRACE_API0("avrc_bld_vol_change");
104    /* get the existing length, if any, and also the num attributes */
105    // Set the notify value
106    p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
107    p_data = p_start + 2; /* pdu + rsvd */
108    /* add fixed length 5 -*/
109    UINT16_TO_BE_STREAM(p_data, 5);
110    UINT8_TO_BE_STREAM(p_data,AVRC_EVT_VOLUME_CHANGE);
111    UINT32_TO_BE_STREAM(p_data, 0);
112    p_pkt->len = (p_data - p_start);
113    return AVRC_STS_NO_ERROR;
114}
115#endif
116
117/*******************************************************************************
118**
119** Function         avrc_bld_init_cmd_buffer
120**
121** Description      This function initializes the command buffer based on PDU
122**
123** Returns          NULL, if no GKI buffer or failure to build the message.
124**                  Otherwise, the GKI buffer that contains the initialized message.
125**
126*******************************************************************************/
127static BT_HDR *avrc_bld_init_cmd_buffer(tAVRC_COMMAND *p_cmd)
128{
129    UINT16 offset = 0, chnl = AVCT_DATA_CTRL, len=AVRC_META_CMD_POOL_SIZE;
130    BT_HDR *p_pkt=NULL;
131    UINT8  opcode;
132
133    opcode = avrc_opcode_from_pdu(p_cmd->pdu);
134    AVRC_TRACE_API2("avrc_bld_init_cmd_buffer: pdu=%x, opcode=%x", p_cmd->pdu, opcode);
135
136    switch (opcode)
137    {
138    case AVRC_OP_PASS_THRU:
139        offset  = AVRC_MSG_PASS_THRU_OFFSET;
140        break;
141
142    case AVRC_OP_VENDOR:
143        offset  = AVRC_MSG_VENDOR_OFFSET;
144        break;
145    }
146
147    /* allocate and initialize the buffer */
148    p_pkt = (BT_HDR *)GKI_getbuf(len);
149    if (p_pkt)
150    {
151        UINT8 *p_data, *p_start;
152
153        p_pkt->layer_specific = chnl;
154        p_pkt->event    = opcode;
155        p_pkt->offset   = offset;
156        p_data = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
157        p_start = p_data;
158
159        /* pass thru - group navigation - has a two byte op_id, so dont do it here */
160        if (opcode != AVRC_OP_PASS_THRU)
161            *p_data++ = p_cmd->pdu;
162
163        switch (opcode)
164        {
165        case AVRC_OP_VENDOR:
166            /* reserved 0, packet_type 0 */
167            UINT8_TO_BE_STREAM(p_data, 0);
168            /* continue to the next "case to add length */
169            /* add fixed lenth - 0 */
170            UINT16_TO_BE_STREAM(p_data, 0);
171            break;
172        }
173
174        p_pkt->len = (p_data - p_start);
175    }
176    p_cmd->cmd.opcode = opcode;
177    return p_pkt;
178}
179
180/*******************************************************************************
181**
182** Function         AVRC_BldCommand
183**
184** Description      This function builds the given AVRCP command to the given
185**                  GKI buffer
186**
187** Returns          AVRC_STS_NO_ERROR, if the command is built successfully
188**                  Otherwise, the error code.
189**
190*******************************************************************************/
191tAVRC_STS AVRC_BldCommand( tAVRC_COMMAND *p_cmd, BT_HDR **pp_pkt)
192{
193    tAVRC_STS status = AVRC_STS_BAD_PARAM;
194    BT_HDR  *p_pkt;
195    BOOLEAN alloc = FALSE;
196
197    AVRC_TRACE_API2("AVRC_BldCommand: pdu=%x status=%x", p_cmd->cmd.pdu, p_cmd->cmd.status);
198    if (!p_cmd || !pp_pkt)
199    {
200        AVRC_TRACE_API2("AVRC_BldCommand. Invalid parameters passed. p_cmd=%p, pp_pkt=%p",
201            p_cmd, pp_pkt);
202        return AVRC_STS_BAD_PARAM;
203    }
204
205    if (*pp_pkt == NULL)
206    {
207        if ((*pp_pkt = avrc_bld_init_cmd_buffer(p_cmd)) == NULL)
208        {
209            AVRC_TRACE_API0("AVRC_BldCommand: Failed to initialize command buffer");
210            return AVRC_STS_INTERNAL_ERR;
211        }
212        alloc = TRUE;
213    }
214    status = AVRC_STS_NO_ERROR;
215    p_pkt = *pp_pkt;
216
217    switch (p_cmd->pdu)
218    {
219    case AVRC_PDU_REQUEST_CONTINUATION_RSP:     /*        0x40 */
220        status = avrc_bld_next_cmd(&p_cmd->continu, p_pkt);
221        break;
222
223    case AVRC_PDU_ABORT_CONTINUATION_RSP:       /*          0x41 */
224        status = avrc_bld_next_cmd(&p_cmd->abort, p_pkt);
225        break;
226#if (AVRC_ADV_CTRL_INCLUDED == TRUE)
227    case AVRC_PDU_SET_ABSOLUTE_VOLUME:         /* 0x50 */
228        status = avrc_bld_set_abs_volume_cmd(&p_cmd->volume, p_pkt);
229        break;
230#endif
231
232    case AVRC_PDU_REGISTER_NOTIFICATION:      /* 0x31 */
233#if (AVRC_ADV_CTRL_INCLUDED == TRUE)
234        if(AVRC_EVT_VOLUME_CHANGE==p_cmd->reg_notif.event_id)
235           status=avrc_bld_vol_change_notfn(p_pkt);
236#endif
237        break;
238
239    }
240
241    if (alloc && (status != AVRC_STS_NO_ERROR) )
242    {
243        GKI_freebuf(p_pkt);
244        *pp_pkt = NULL;
245    }
246    AVRC_TRACE_API1("AVRC_BldCommand: returning %d", status);
247    return status;
248}
249#endif /* (AVRC_METADATA_INCLUDED == TRUE) */
250
251