status_t AudioTrack::set(
int streamType,
uint32_t sampleRate,
int format,
int channelMask,
int frameCount,
uint32_t flags,
callback_t cbf,
void* user,
int notificationFrames,
const sp<IMemory>& sharedBuffer,
bool threadCanCallJava,
int sessionId)
{
LOGV_IF(sharedBuffer != 0, "sharedBuffer: %p, size: %d", sharedBuffer->pointer(), sharedBuffer->size());
AutoMutex lock(mLock);
if (mAudioTrack != 0) {
LOGE("Track already in use");
return INVALID_OPERATION;
}
int afSampleRate;
if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) {
return NO_INIT;
}
uint32_t afLatency;
if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) {
return NO_INIT;
}
// handle default values first.
if (streamType == AUDIO_STREAM_DEFAULT) {
streamType = AUDIO_STREAM_MUSIC;
}
if (sampleRate == 0) {
sampleRate = afSampleRate;
}
// these below should probably come from the audioFlinger too...
if (format == 0) {
format = AUDIO_FORMAT_PCM_16_BIT;
}
if (channelMask == 0) {
channelMask = AUDIO_CHANNEL_OUT_STEREO;
}
// validate parameters
if (!audio_is_valid_format(format)) {
LOGE("Invalid format");
return BAD_VALUE;
}
// force direct flag if format is not linear PCM
if (!audio_is_linear_pcm(format)) {
flags |= AUDIO_POLICY_OUTPUT_FLAG_DIRECT;
}
if (!audio_is_output_channel(channelMask)) {
LOGE("Invalid channel mask");
return BAD_VALUE;
}
uint32_t channelCount = popcount(channelMask);
audio_io_handle_t output = AudioSystem::getOutput(
(audio_stream_type_t)streamType,
sampleRate,format, channelMask,
(audio_policy_output_flags_t)flags);
if (output == 0) {
LOGE("Could not get audio output for stream type %d", streamType);
return BAD_VALUE;
}
mVolume[LEFT] = 1.0f;
mVolume[RIGHT] = 1.0f;
mSendLevel = 0;
mFrameCount = frameCount;
mNotificationFramesReq = notificationFrames;
mSessionId = sessionId;
mAuxEffectId = 0;
// create the IAudioTrack
status_t status = createTrack_l(streamType,
sampleRate,
(uint32_t)format,
(uint32_t)channelMask,
frameCount,
flags,
sharedBuffer,
output,
true);
if (status != NO_ERROR) {
return status;
}
if (cbf != 0) {
mAudioTrackThread = new AudioTrackThread(*this, threadCanCallJava);
if (mAudioTrackThread == 0) {
LOGE("Could not create callback thread");
return NO_INIT;
}
}
mStatus = NO_ERROR;
mStreamType = streamType;
mFormat = (uint32_t)format;
mChannelMask = (uint32_t)channelMask;
mChannelCount = channelCount;
mSharedBuffer = sharedBuffer;
mMuted = false;
mActive = 0;
mCbf = cbf;
mUserData = user;
mLoopCount = 0;
mMarkerPosition = 0;
mMarkerReached = false;
mNewPosition = 0;
mUpdatePeriod = 0;
mFlushed = false;
mFlags = flags;
AudioSystem::acquireAudioSessionId(mSessionId);
mRestoreStatus = NO_ERROR;
return NO_ERROR;
}
// checks if the IO profile is compatible with specified parameters.
// Sampling rate, format and channel mask must be specified in order to
// get a valid a match
bool IOProfile::isCompatibleProfile(audio_devices_t device,
const String8& address,
uint32_t samplingRate,
uint32_t *updatedSamplingRate,
audio_format_t format,
audio_format_t *updatedFormat,
audio_channel_mask_t channelMask,
audio_channel_mask_t *updatedChannelMask,
uint32_t flags) const
{
const bool isPlaybackThread =
getType() == AUDIO_PORT_TYPE_MIX && getRole() == AUDIO_PORT_ROLE_SOURCE;
const bool isRecordThread =
getType() == AUDIO_PORT_TYPE_MIX && getRole() == AUDIO_PORT_ROLE_SINK;
ALOG_ASSERT(isPlaybackThread != isRecordThread);
if (device != AUDIO_DEVICE_NONE) {
// just check types if multiple devices are selected
if (popcount(device & ~AUDIO_DEVICE_BIT_IN) > 1) {
if ((mSupportedDevices.types() & device) != device) {
return false;
}
} else if (mSupportedDevices.getDevice(device, address) == 0) {
return false;
}
}
if (!audio_is_valid_format(format) ||
(isPlaybackThread && (samplingRate == 0 || !audio_is_output_channel(channelMask))) ||
(isRecordThread && (!audio_is_input_channel(channelMask)))) {
return false;
}
audio_format_t myUpdatedFormat = format;
audio_channel_mask_t myUpdatedChannelMask = channelMask;
uint32_t myUpdatedSamplingRate = samplingRate;
if (isRecordThread)
{
if (checkCompatibleAudioProfile(
myUpdatedSamplingRate, myUpdatedChannelMask, myUpdatedFormat) != NO_ERROR) {
return false;
}
} else {
if (checkExactAudioProfile(samplingRate, channelMask, format) != NO_ERROR) {
return false;
}
}
if (isPlaybackThread && (getFlags() & flags) != flags) {
return false;
}
// The only input flag that is allowed to be different is the fast flag.
// An existing fast stream is compatible with a normal track request.
// An existing normal stream is compatible with a fast track request,
// but the fast request will be denied by AudioFlinger and converted to normal track.
if (isRecordThread && ((getFlags() ^ flags) &
~AUDIO_INPUT_FLAG_FAST)) {
return false;
}
if (updatedSamplingRate != NULL) {
*updatedSamplingRate = myUpdatedSamplingRate;
}
if (updatedFormat != NULL) {
*updatedFormat = myUpdatedFormat;
}
if (updatedChannelMask != NULL) {
*updatedChannelMask = myUpdatedChannelMask;
}
return true;
}
