audio_io_handle_t AudioPolicyService::getInput(audio_source_t inputSource,
uint32_t samplingRate,
audio_format_t format,
audio_channel_mask_t channelMask,
int audioSession,
audio_input_flags_t flags)
{
if (mAudioPolicyManager == NULL) {
return 0;
}
// already checked by client, but double-check in case the client wrapper is bypassed
if (inputSource >= AUDIO_SOURCE_CNT && inputSource != AUDIO_SOURCE_HOTWORD) {
return 0;
}
if ((inputSource == AUDIO_SOURCE_HOTWORD) && !captureHotwordAllowed()) {
return 0;
}
audio_io_handle_t input;
sp<AudioPolicyEffects>audioPolicyEffects;
{
Mutex::Autolock _l(mLock);
// the audio_in_acoustics_t parameter is ignored by get_input()
input = mAudioPolicyManager->getInput(inputSource, samplingRate,
format, channelMask,
(audio_session_t)audioSession, flags);
audioPolicyEffects = mAudioPolicyEffects;
}
if (input == 0) {
return input;
}
if (audioPolicyEffects != 0) {
// create audio pre processors according to input source
status_t status = audioPolicyEffects->addInputEffects(input, inputSource, audioSession);
if (status != NO_ERROR && status != ALREADY_EXISTS) {
ALOGW("Failed to add effects on input %d", input);
}
}
return input;
}
status_t AudioPolicyService::getInputForAttr(const audio_attributes_t *attr,
audio_io_handle_t *input,
audio_session_t session,
uid_t uid,
uint32_t samplingRate,
audio_format_t format,
audio_channel_mask_t channelMask,
audio_input_flags_t flags,
audio_port_handle_t selectedDeviceId)
{
if (mAudioPolicyManager == NULL) {
return NO_INIT;
}
// already checked by client, but double-check in case the client wrapper is bypassed
if (attr->source >= AUDIO_SOURCE_CNT && attr->source != AUDIO_SOURCE_HOTWORD &&
attr->source != AUDIO_SOURCE_FM_TUNER) {
return BAD_VALUE;
}
if ((attr->source == AUDIO_SOURCE_HOTWORD) && !captureHotwordAllowed()) {
return BAD_VALUE;
}
sp<AudioPolicyEffects>audioPolicyEffects;
status_t status;
AudioPolicyInterface::input_type_t inputType;
// if the caller is us, trust the specified uid
if (IPCThreadState::self()->getCallingPid() != getpid_cached || uid == (uid_t)-1) {
uid_t newclientUid = IPCThreadState::self()->getCallingUid();
if (uid != (uid_t)-1 && uid != newclientUid) {
ALOGW("%s uid %d tried to pass itself off as %d", __FUNCTION__, newclientUid, uid);
}
uid = newclientUid;
}
{
Mutex::Autolock _l(mLock);
// the audio_in_acoustics_t parameter is ignored by get_input()
status = mAudioPolicyManager->getInputForAttr(attr, input, session, uid,
samplingRate, format, channelMask,
flags, selectedDeviceId,
&inputType);
audioPolicyEffects = mAudioPolicyEffects;
if (status == NO_ERROR) {
// enforce permission (if any) required for each type of input
switch (inputType) {
case AudioPolicyInterface::API_INPUT_LEGACY:
break;
case AudioPolicyInterface::API_INPUT_TELEPHONY_RX:
// FIXME: use the same permission as for remote submix for now.
case AudioPolicyInterface::API_INPUT_MIX_CAPTURE:
if (!captureAudioOutputAllowed()) {
ALOGE("getInputForAttr() permission denied: capture not allowed");
status = PERMISSION_DENIED;
}
break;
case AudioPolicyInterface::API_INPUT_MIX_EXT_POLICY_REROUTE:
if (!modifyAudioRoutingAllowed()) {
ALOGE("getInputForAttr() permission denied: modify audio routing not allowed");
status = PERMISSION_DENIED;
}
break;
case AudioPolicyInterface::API_INPUT_INVALID:
default:
LOG_ALWAYS_FATAL("getInputForAttr() encountered an invalid input type %d",
(int)inputType);
}
}
if (status != NO_ERROR) {
if (status == PERMISSION_DENIED) {
mAudioPolicyManager->releaseInput(*input, session);
}
return status;
}
}
if (audioPolicyEffects != 0) {
// create audio pre processors according to input source
status_t status = audioPolicyEffects->addInputEffects(*input, attr->source, session);
if (status != NO_ERROR && status != ALREADY_EXISTS) {
ALOGW("Failed to add effects on input %d", *input);
}
}
return NO_ERROR;
}