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avrcp-lib.c
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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2014 Intel Corporation. All rights reserved.
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdbool.h>
#include <glib.h>
#include <errno.h>
#include <string.h>
#include "lib/bluetooth.h"
#include "src/shared/util.h"
#include "src/log.h"
#include "avctp.h"
#include "avrcp-lib.h"
/* Packet types */
#define AVRCP_PACKET_TYPE_SINGLE 0x00
#define AVRCP_PACKET_TYPE_START 0x01
#define AVRCP_PACKET_TYPE_CONTINUING 0x02
#define AVRCP_PACKET_TYPE_END 0x03
#define AVRCP_CHARSET_UTF8 0x006a
#if __BYTE_ORDER == __LITTLE_ENDIAN
struct avrcp_header {
uint8_t company_id[3];
uint8_t pdu_id;
uint8_t packet_type:2;
uint8_t rsvd:6;
uint16_t params_len;
uint8_t params[0];
} __attribute__ ((packed));
#define AVRCP_HEADER_LENGTH 7
#elif __BYTE_ORDER == __BIG_ENDIAN
struct avrcp_header {
uint8_t company_id[3];
uint8_t pdu_id;
uint8_t rsvd:6;
uint8_t packet_type:2;
uint16_t params_len;
uint8_t params[0];
} __attribute__ ((packed));
#define AVRCP_HEADER_LENGTH 7
#else
#error "Unknown byte order"
#endif
struct avrcp_browsing_header {
uint8_t pdu_id;
uint16_t params_len;
uint8_t params[0];
} __attribute__ ((packed));
#define AVRCP_BROWSING_HEADER_LENGTH 3
struct get_capabilities_req {
uint8_t cap;
uint8_t params[0];
} __attribute__ ((packed));
struct get_capabilities_rsp {
uint8_t cap;
uint8_t number;
uint8_t params[0];
} __attribute__ ((packed));
struct list_attributes_rsp {
uint8_t number;
uint8_t params[0];
} __attribute__ ((packed));
struct list_values_req {
uint8_t attr;
} __attribute__ ((packed));
struct list_values_rsp {
uint8_t number;
uint8_t params[0];
} __attribute__ ((packed));
struct get_value_req {
uint8_t number;
uint8_t attrs[0];
} __attribute__ ((packed));
struct attr_value {
uint8_t attr;
uint8_t value;
} __attribute__ ((packed));
struct value_rsp {
uint8_t number;
struct attr_value values[0];
} __attribute__ ((packed));
struct set_value_req {
uint8_t number;
struct attr_value values[0];
} __attribute__ ((packed));
struct get_attribute_text_req {
uint8_t number;
uint8_t attrs[0];
} __attribute__ ((packed));
struct text_value {
uint8_t attr;
uint16_t charset;
uint8_t len;
char data[0];
} __attribute__ ((packed));
struct get_attribute_text_rsp {
uint8_t number;
struct text_value values[0];
} __attribute__ ((packed));
struct get_value_text_req {
uint8_t attr;
uint8_t number;
uint8_t values[0];
} __attribute__ ((packed));
struct get_value_text_rsp {
uint8_t number;
struct text_value values[0];
} __attribute__ ((packed));
struct media_item {
uint32_t attr;
uint16_t charset;
uint16_t len;
char data[0];
} __attribute__ ((packed));
struct get_element_attributes_req {
uint64_t id;
uint8_t number;
uint32_t attrs[0];
} __attribute__ ((packed));
struct get_element_attributes_rsp {
uint8_t number;
struct media_item items[0];
} __attribute__ ((packed));
struct get_play_status_rsp {
uint32_t duration;
uint32_t position;
uint8_t status;
} __attribute__ ((packed));
struct register_notification_req {
uint8_t event;
uint32_t interval;
} __attribute__ ((packed));
struct register_notification_rsp {
uint8_t event;
uint8_t data[0];
} __attribute__ ((packed));
struct set_volume_req {
uint8_t value;
} __attribute__ ((packed));
struct set_volume_rsp {
uint8_t value;
} __attribute__ ((packed));
struct set_addressed_req {
uint16_t id;
} __attribute__ ((packed));
struct set_addressed_rsp {
uint8_t status;
} __attribute__ ((packed));
struct set_browsed_req {
uint16_t id;
} __attribute__ ((packed));
struct set_browsed_rsp {
uint8_t status;
uint16_t counter;
uint32_t items;
uint16_t charset;
uint8_t depth;
uint8_t data[0];
} __attribute__ ((packed));
struct get_folder_items_req {
uint8_t scope;
uint32_t start;
uint32_t end;
uint8_t number;
uint32_t attrs[0];
} __attribute__ ((packed));
struct get_folder_items_rsp {
uint8_t status;
uint16_t counter;
uint16_t number;
uint8_t data[0];
} __attribute__ ((packed));
struct change_path_req {
uint16_t counter;
uint8_t direction;
uint64_t uid;
} __attribute__ ((packed));
struct change_path_rsp {
uint8_t status;
uint32_t items;
} __attribute__ ((packed));
struct get_item_attributes_req {
uint8_t scope;
uint64_t uid;
uint16_t counter;
uint8_t number;
uint32_t attrs[0];
} __attribute__ ((packed));
struct get_item_attributes_rsp {
uint8_t status;
uint8_t number;
struct media_item items[0];
} __attribute__ ((packed));
struct play_item_req {
uint8_t scope;
uint64_t uid;
uint16_t counter;
} __attribute__ ((packed));
struct play_item_rsp {
uint8_t status;
} __attribute__ ((packed));
struct search_req {
uint16_t charset;
uint16_t len;
char string[0];
} __attribute__ ((packed));
struct search_rsp {
uint8_t status;
uint16_t counter;
uint32_t items;
} __attribute__ ((packed));
struct add_to_now_playing_req {
uint8_t scope;
uint64_t uid;
uint16_t counter;
} __attribute__ ((packed));
struct add_to_now_playing_rsp {
uint8_t status;
} __attribute__ ((packed));
struct avrcp_control_handler {
uint8_t id;
uint8_t code;
uint8_t rsp;
ssize_t (*func) (struct avrcp *session, uint8_t transaction,
uint16_t params_len, uint8_t *params, void *user_data);
};
struct avrcp_browsing_handler {
uint8_t id;
ssize_t (*func) (struct avrcp *session, uint8_t transaction,
uint16_t params_len, uint8_t *params, void *user_data);
};
struct avrcp_continuing {
uint8_t pdu_id;
struct iovec pdu;
};
struct avrcp {
struct avctp *conn;
struct avrcp_player *player;
const struct avrcp_control_handler *control_handlers;
void *control_data;
unsigned int control_id;
uint16_t control_mtu;
struct avrcp_continuing *continuing;
const struct avrcp_passthrough_handler *passthrough_handlers;
void *passthrough_data;
unsigned int passthrough_id;
const struct avrcp_browsing_handler *browsing_handlers;
void *browsing_data;
unsigned int browsing_id;
avrcp_destroy_cb_t destroy;
void *destroy_data;
};
struct avrcp_player {
const struct avrcp_control_ind *ind;
const struct avrcp_control_cfm *cfm;
void *user_data;
};
static inline uint32_t ntoh24(const uint8_t src[3])
{
return src[0] << 16 | src[1] << 8 | src[2];
}
static inline void hton24(uint8_t dst[3], uint32_t src)
{
dst[0] = (src & 0xff0000) >> 16;
dst[1] = (src & 0x00ff00) >> 8;
dst[2] = (src & 0x0000ff);
}
static void continuing_free(struct avrcp_continuing *continuing)
{
g_free(continuing->pdu.iov_base);
g_free(continuing);
}
void avrcp_shutdown(struct avrcp *session)
{
if (session->conn) {
if (session->control_id > 0)
avctp_unregister_pdu_handler(session->conn,
session->control_id);
if (session->passthrough_id > 0)
avctp_unregister_passthrough_handler(session->conn,
session->passthrough_id);
if (session->browsing_id > 0)
avctp_unregister_browsing_pdu_handler(session->conn,
session->browsing_id);
/* clear destroy callback that would call shutdown again */
avctp_set_destroy_cb(session->conn, NULL, NULL);
avctp_shutdown(session->conn);
}
if (session->destroy)
session->destroy(session->destroy_data);
if (session->continuing)
continuing_free(session->continuing);
g_free(session->player);
g_free(session);
}
static struct avrcp_header *parse_pdu(uint8_t *operands, size_t operand_count)
{
struct avrcp_header *pdu;
if (!operands || operand_count < sizeof(*pdu)) {
error("AVRCP: packet too small (%zu bytes)", operand_count);
return NULL;
}
pdu = (void *) operands;
pdu->params_len = ntohs(pdu->params_len);
if (operand_count != pdu->params_len + sizeof(*pdu)) {
error("AVRCP: invalid parameter length (%u bytes)",
pdu->params_len);
return NULL;
}
return pdu;
}
static struct avrcp_browsing_header *parse_browsing_pdu(uint8_t *operands,
size_t operand_count)
{
struct avrcp_browsing_header *pdu;
if (!operands || operand_count < sizeof(*pdu)) {
error("AVRCP: packet too small (%zu bytes)", operand_count);
return NULL;
}
pdu = (void *) operands;
pdu->params_len = ntohs(pdu->params_len);
if (operand_count != pdu->params_len + sizeof(*pdu)) {
error("AVRCP: invalid parameter length (%u bytes)",
pdu->params_len);
return NULL;
}
return pdu;
}
static uint8_t errno2status(int err)
{
switch (err) {
case -ENOSYS:
return AVRCP_STATUS_INVALID_COMMAND;
case -EINVAL:
return AVRCP_STATUS_INVALID_PARAM;
case 0:
return AVRCP_STATUS_SUCCESS;
case -ENOTDIR:
return AVRCP_STATUS_NOT_DIRECTORY;
case -EBADRQC:
return AVRCP_STATUS_INVALID_SCOPE;
case -ERANGE:
return AVRCP_STATUS_OUT_OF_BOUNDS;
case -ENOENT:
return AVRCP_STATUS_DOES_NOT_EXIST;
default:
return AVRCP_STATUS_INTERNAL_ERROR;
}
}
static ssize_t handle_vendordep_pdu(struct avctp *conn, uint8_t transaction,
uint8_t *code, uint8_t *subunit,
uint8_t *operands, size_t operand_count,
void *user_data)
{
struct avrcp *session = user_data;
const struct avrcp_control_handler *handler;
struct avrcp_header *pdu;
uint32_t company_id;
ssize_t ret;
pdu = parse_pdu(operands, operand_count);
if (!pdu) {
pdu = (void *) operands;
pdu->params[0] = AVRCP_STATUS_INVALID_COMMAND;
goto reject;
}
company_id = ntoh24(pdu->company_id);
if (company_id != IEEEID_BTSIG) {
*code = AVC_CTYPE_NOT_IMPLEMENTED;
return 0;
}
DBG("AVRCP PDU 0x%02X, len 0x%04X", pdu->pdu_id, pdu->params_len);
pdu->packet_type = 0;
pdu->rsvd = 0;
if (!session->control_handlers)
goto reject;
for (handler = session->control_handlers; handler->id; handler++) {
if (handler->id == pdu->pdu_id)
break;
}
if (handler->id != pdu->pdu_id || handler->code != *code) {
pdu->params[0] = AVRCP_STATUS_INVALID_COMMAND;
goto reject;
}
if (!handler->func) {
pdu->params[0] = AVRCP_STATUS_INVALID_PARAM;
goto reject;
}
ret = handler->func(session, transaction, pdu->params_len, pdu->params,
session->control_data);
if (ret == 0)
return -EAGAIN;
if (ret < 0) {
if (ret == -EAGAIN)
return ret;
pdu->params[0] = errno2status(ret);
goto reject;
}
*code = handler->rsp;
pdu->params_len = htons(ret);
return AVRCP_HEADER_LENGTH + ret;
reject:
pdu->params_len = htons(1);
*code = AVC_CTYPE_REJECTED;
return AVRCP_HEADER_LENGTH + 1;
}
static bool handle_passthrough_pdu(struct avctp *conn, uint8_t op,
bool pressed, void *user_data)
{
struct avrcp *session = user_data;
const struct avrcp_passthrough_handler *handler;
if (!session->passthrough_handlers)
return false;
for (handler = session->passthrough_handlers; handler->func;
handler++) {
if (handler->op == op)
break;
}
if (handler->func == NULL)
return false;
return handler->func(session, pressed, session->passthrough_data);
}
static void disconnect_cb(void *data)
{
struct avrcp *session = data;
session->conn = NULL;
avrcp_shutdown(session);
}
struct avrcp *avrcp_new(int fd, size_t imtu, size_t omtu, uint16_t version)
{
struct avrcp *session;
session = g_new0(struct avrcp, 1);
session->conn = avctp_new(fd, imtu, omtu, version);
if (!session->conn) {
g_free(session);
return NULL;
}
session->passthrough_id = avctp_register_passthrough_handler(
session->conn,
handle_passthrough_pdu,
session);
session->control_id = avctp_register_pdu_handler(session->conn,
AVC_OP_VENDORDEP,
handle_vendordep_pdu,
session);
session->control_mtu = omtu - AVC_DATA_OFFSET;
/*
* 27.1.2 AV/C Command Frame
* An AV/C command frame contains up to 512 octets of data
*/
if (session->control_mtu > AVC_DATA_MTU)
session->control_mtu = AVC_DATA_MTU;
avctp_set_destroy_cb(session->conn, disconnect_cb, session);
return session;
}
static ssize_t handle_browsing_pdu(struct avctp *conn,
uint8_t transaction, uint8_t *operands,
size_t operand_count, void *user_data)
{
struct avrcp *session = user_data;
const struct avrcp_browsing_handler *handler;
struct avrcp_browsing_header *pdu;
int ret;
pdu = parse_browsing_pdu(operands, operand_count);
if (!pdu) {
pdu = (void *) operands;
pdu->params[0] = AVRCP_STATUS_INVALID_COMMAND;
goto reject;
}
DBG("AVRCP Browsing PDU 0x%02X, len 0x%04X", pdu->pdu_id,
pdu->params_len);
if (!session->browsing_handlers) {
pdu->pdu_id = AVRCP_GENERAL_REJECT;
pdu->params[0] = AVRCP_STATUS_INTERNAL_ERROR;
goto reject;
}
for (handler = session->browsing_handlers; handler->id; handler++) {
if (handler->id == pdu->pdu_id)
break;
}
if (handler->id != pdu->pdu_id) {
pdu->pdu_id = AVRCP_GENERAL_REJECT;
pdu->params[0] = AVRCP_STATUS_INVALID_COMMAND;
goto reject;
}
if (!handler->func) {
pdu->params[0] = AVRCP_STATUS_INVALID_PARAM;
goto reject;
}
ret = handler->func(session, transaction, pdu->params_len, pdu->params,
session->control_data);
if (ret == 0)
return -EAGAIN;
if (ret < 0) {
if (ret == -EAGAIN)
return ret;
pdu->params[0] = errno2status(ret);
goto reject;
}
pdu->params_len = htons(ret);
return AVRCP_BROWSING_HEADER_LENGTH + ret;
reject:
pdu->params_len = htons(1);
return AVRCP_BROWSING_HEADER_LENGTH + 1;
}
static void browsing_disconnect_cb(void *data)
{
struct avrcp *session = data;
session->browsing_id = 0;
}
int avrcp_connect_browsing(struct avrcp *session, int fd, size_t imtu,
size_t omtu)
{
int err;
err = avctp_connect_browsing(session->conn, fd, imtu, omtu);
if (err < 0)
return err;
session->browsing_id = avctp_register_browsing_pdu_handler(
session->conn,
handle_browsing_pdu,
session,
browsing_disconnect_cb);
return 0;
}
void avrcp_set_destroy_cb(struct avrcp *session, avrcp_destroy_cb_t cb,
void *user_data)
{
session->destroy = cb;
session->destroy_data = user_data;
}
static ssize_t get_capabilities(struct avrcp *session, uint8_t transaction,
uint16_t params_len, uint8_t *params,
void *user_data)
{
struct avrcp_player *player = user_data;
struct get_capabilities_req *req;
if (!params || params_len != sizeof(*req))
return -EINVAL;
req = (void *) params;
switch (req->cap) {
case CAP_COMPANY_ID:
req->params[0] = 1;
hton24(&req->params[1], IEEEID_BTSIG);
return 5;
case CAP_EVENTS_SUPPORTED:
if (!player->ind || !player->ind->get_capabilities)
return -ENOSYS;
return player->ind->get_capabilities(session, transaction,
player->user_data);
}
return -EINVAL;
}
static ssize_t list_attributes(struct avrcp *session, uint8_t transaction,
uint16_t params_len, uint8_t *params,
void *user_data)
{
struct avrcp_player *player = user_data;
DBG("");
if (!player->ind || !player->ind->list_attributes)
return -ENOSYS;
return player->ind->list_attributes(session, transaction,
player->user_data);
}
static bool check_attributes(uint8_t number, const uint8_t *attrs)
{
int i;
for (i = 0; i < number; i++) {
if (attrs[i] > AVRCP_ATTRIBUTE_LAST ||
attrs[i] == AVRCP_ATTRIBUTE_ILEGAL)
return false;
}
return true;
}
static ssize_t get_attribute_text(struct avrcp *session, uint8_t transaction,
uint16_t params_len, uint8_t *params,
void *user_data)
{
struct avrcp_player *player = user_data;
struct get_attribute_text_req *req;
DBG("");
if (!player->ind || !player->ind->get_attribute_text)
return -ENOSYS;
if (!params || params_len < sizeof(*req))
return -EINVAL;
req = (void *) params;
if (params_len != sizeof(*req) + req->number)
return -EINVAL;
if (!check_attributes(req->number, req->attrs))
return -EINVAL;
return player->ind->get_attribute_text(session, transaction,
req->number, req->attrs,
player->user_data);
}
static ssize_t list_values(struct avrcp *session, uint8_t transaction,
uint16_t params_len, uint8_t *params,
void *user_data)
{
struct avrcp_player *player = user_data;
struct list_values_req *req;
DBG("");
if (!params || params_len != sizeof(*req))
return -EINVAL;
req = (void *) params;
if (req->attr > AVRCP_ATTRIBUTE_LAST ||
req->attr == AVRCP_ATTRIBUTE_ILEGAL)
return -EINVAL;
if (!player->ind || !player->ind->list_values)
return -ENOSYS;
return player->ind->list_values(session, transaction, req->attr,
player->user_data);
}
static bool check_value(uint8_t attr, uint8_t number, const uint8_t *values)
{
int i;
for (i = 0; i < number; i++) {
/* Check for invalid value */
switch (attr) {
case AVRCP_ATTRIBUTE_EQUALIZER:
if (values[i] < AVRCP_EQUALIZER_OFF ||
values[i] > AVRCP_EQUALIZER_ON)
return false;
break;
case AVRCP_ATTRIBUTE_REPEAT_MODE:
if (values[i] < AVRCP_REPEAT_MODE_OFF ||
values[i] > AVRCP_REPEAT_MODE_GROUP)
return false;
break;
case AVRCP_ATTRIBUTE_SHUFFLE:
if (values[i] < AVRCP_SHUFFLE_OFF ||
values[i] > AVRCP_SHUFFLE_GROUP)
return false;
break;
case AVRCP_ATTRIBUTE_SCAN:
if (values[i] < AVRCP_SCAN_OFF ||
values[i] > AVRCP_SCAN_GROUP)
return false;
break;
}
}
return true;
}
static ssize_t get_value_text(struct avrcp *session, uint8_t transaction,
uint16_t params_len, uint8_t *params,
void *user_data)
{
struct avrcp_player *player = user_data;
struct get_value_text_req *req;
DBG("");
if (!player->ind || !player->ind->get_value_text)
return -ENOSYS;
if (!params || params_len < sizeof(*req))
return -EINVAL;
req = (void *) params;
if (params_len != sizeof(*req) + req->number)
return -EINVAL;
if (req->number > AVRCP_ATTRIBUTE_LAST ||
req->number == AVRCP_ATTRIBUTE_ILEGAL)
return -EINVAL;
if (!check_value(req->attr, req->number, req->values))
return -EINVAL;
return player->ind->get_value_text(session, transaction, params[0],
params[1], ¶ms[2],
player->user_data);
}
static ssize_t get_value(struct avrcp *session, uint8_t transaction,
uint16_t params_len, uint8_t *params,
void *user_data)
{
struct avrcp_player *player = user_data;
struct get_value_req *req;
DBG("");
if (!player->ind || !player->ind->get_value)
return -ENOSYS;
if (!params || params_len < sizeof(*req))
return -EINVAL;
req = (void *) params;
if (params_len < sizeof(*req) + req->number)
return -EINVAL;
if (!check_attributes(req->number, req->attrs))
return -EINVAL;
return player->ind->get_value(session, transaction, params[0],
¶ms[1], player->user_data);
}
static ssize_t set_value(struct avrcp *session, uint8_t transaction,
uint16_t params_len, uint8_t *params,
void *user_data)
{
struct avrcp_player *player = user_data;
struct set_value_req *req;
uint8_t attrs[AVRCP_ATTRIBUTE_LAST];
uint8_t values[AVRCP_ATTRIBUTE_LAST];
int i;
DBG("");
if (!player->ind || !player->ind->set_value)
return -ENOSYS;
if (!params || params_len < sizeof(*req))
return -EINVAL;
req = (void *) params;
if (params_len < sizeof(*req) + req->number * sizeof(*req->values))
return -EINVAL;
for (i = 0; i < req->number; i++) {
attrs[i] = req->values[i].attr;
values[i] = req->values[i].value;
if (!check_value(attrs[i], 1, &values[i]))
return -EINVAL;
}
return player->ind->set_value(session, transaction, req->number,
attrs, values, player->user_data);
}
static ssize_t get_play_status(struct avrcp *session, uint8_t transaction,
uint16_t params_len, uint8_t *params,
void *user_data)
{
struct avrcp_player *player = user_data;
DBG("");
if (!player->ind || !player->ind->get_play_status)
return -ENOSYS;
return player->ind->get_play_status(session, transaction,
player->user_data);
}
static bool parse_attributes(uint32_t *params, uint16_t params_len,
uint8_t number, uint32_t *attrs)
{
int i;
for (i = 0; i < number && params_len >= sizeof(*attrs); i++,
params_len -= sizeof(*attrs)) {
attrs[i] = be32_to_cpu(params[i]);
if (attrs[i] == AVRCP_MEDIA_ATTRIBUTE_ILLEGAL ||
attrs[i] > AVRCP_MEDIA_ATTRIBUTE_LAST)
return false;
}
return true;
}
static ssize_t get_element_attributes(struct avrcp *session,
uint8_t transaction,
uint16_t params_len,
uint8_t *params,
void *user_data)
{
struct avrcp_player *player = user_data;
struct get_element_attributes_req *req;
uint64_t uid;
uint32_t attrs[AVRCP_MEDIA_ATTRIBUTE_LAST];
DBG("");
if (!player->ind || !player->ind->get_element_attributes)
return -ENOSYS;
req = (void *) params;
if (!params || params_len < sizeof(*req))
return -EINVAL;
if (!parse_attributes(req->attrs, params_len - sizeof(*req),
req->number, attrs))
return -EINVAL;
uid = get_be64(params);
return player->ind->get_element_attributes(session, transaction, uid,
req->number, attrs,
player->user_data);
}
static ssize_t register_notification(struct avrcp *session, uint8_t transaction,
uint16_t params_len, uint8_t *params,
void *user_data)
{
struct avrcp_player *player = user_data;
struct register_notification_req *req;
uint32_t interval;
DBG("");
if (!player->ind || !player->ind->register_notification)
return -ENOSYS;
if (!params || params_len != sizeof(*req))
return -EINVAL;
req = (void *) params;
interval = be32_to_cpu(req->interval);
return player->ind->register_notification(session, transaction,
req->event, interval,
player->user_data);
}