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/*
* Copyright 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <grp.h>
#include <sys/stat.h>
#include <memory>
#include "osi/include/log.h"
#include "stack/btm/btm_sco.h"
#include "udrv/include/uipc.h"
#if ESCO_DATA_PATH == ESCO_DATA_PATH_PCM
// For hardware encoding path, provide an empty implementation
namespace bluetooth::audio::sco {
void open() {}
void cleanup() {}
size_t read(uint8_t*, uint32_t) { return 0; }
size_t write(const uint8_t*, uint32_t) { return 0; }
} // namespace bluetooth::audio::sco
#else
#define SCO_DATA_READ_POLL_MS 10
#define SCO_HOST_DATA_PATH "/var/run/bluetooth/audio/.sco_data"
// TODO(b/198260375): Make SCO data owner group configurable.
#define SCO_HOST_DATA_GROUP "bluetooth-audio"
namespace {
std::unique_ptr<tUIPC_STATE> sco_uipc = nullptr;
void sco_data_cb(tUIPC_CH_ID, tUIPC_EVENT event) {
switch (event) {
case UIPC_OPEN_EVT:
/*
* Read directly from media task from here on (keep callback for
* connection events.
*/
UIPC_Ioctl(*sco_uipc, UIPC_CH_ID_AV_AUDIO, UIPC_REG_REMOVE_ACTIVE_READSET,
NULL);
UIPC_Ioctl(*sco_uipc, UIPC_CH_ID_AV_AUDIO, UIPC_SET_READ_POLL_TMO,
reinterpret_cast<void*>(SCO_DATA_READ_POLL_MS));
break;
default:
break;
}
}
} // namespace
namespace bluetooth {
namespace audio {
namespace sco {
void open() {
if (sco_uipc != nullptr) {
LOG_WARN("Re-opening UIPC that is already running");
}
sco_uipc = UIPC_Init();
UIPC_Open(*sco_uipc, UIPC_CH_ID_AV_AUDIO, sco_data_cb, SCO_HOST_DATA_PATH);
struct group* grp = getgrnam(SCO_HOST_DATA_GROUP);
chmod(SCO_HOST_DATA_PATH, 0770);
if (grp) {
int res = chown(SCO_HOST_DATA_PATH, -1, grp->gr_gid);
if (res == -1) {
LOG_ERROR("%s failed: %s", __func__, strerror(errno));
}
}
}
void cleanup() {
if (sco_uipc == nullptr) {
return;
}
UIPC_Close(*sco_uipc, UIPC_CH_ID_ALL);
sco_uipc = nullptr;
}
size_t read(uint8_t* p_buf, uint32_t len) {
if (sco_uipc == nullptr) {
LOG_WARN("Read from uninitialized or closed UIPC");
return 0;
}
return UIPC_Read(*sco_uipc, UIPC_CH_ID_AV_AUDIO, p_buf, len);
}
size_t write(const uint8_t* p_buf, uint32_t len) {
if (sco_uipc == nullptr) {
LOG_WARN("Write to uninitialized or closed UIPC");
return 0;
}
return UIPC_Send(*sco_uipc, UIPC_CH_ID_AV_AUDIO, 0, p_buf, len);
}
} // namespace sco
} // namespace audio
} // namespace bluetooth
#endif
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