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/*
**
** Copyright 2015, 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.
*/
#define LOG_TAG "AudioFlinger"
//#define LOG_NDEBUG 0
#include <hardware/audio.h>
#include <utils/Log.h>
#include "AudioHwDevice.h"
#include "AudioStreamOut.h"
namespace android {
// ----------------------------------------------------------------------------
AudioStreamOut::AudioStreamOut(AudioHwDevice *dev, audio_output_flags_t flags)
: audioHwDev(dev)
, stream(NULL)
, flags(flags)
, mFramesWritten(0)
, mFramesWrittenAtStandby(0)
, mRenderPosition(0)
, mRateMultiplier(1)
, mHalFormatIsLinearPcm(false)
, mHalFrameSize(0)
{
}
audio_hw_device_t *AudioStreamOut::hwDev() const
{
return audioHwDev->hwDevice();
}
status_t AudioStreamOut::getRenderPosition(uint64_t *frames)
{
if (stream == NULL) {
return NO_INIT;
}
uint32_t halPosition = 0;
status_t status = stream->get_render_position(stream, &halPosition);
if (status != NO_ERROR) {
return status;
}
// Maintain a 64-bit render position using the 32-bit result from the HAL.
// This delta calculation relies on the arithmetic overflow behavior
// of integers. For example (100 - 0xFFFFFFF0) = 116.
uint32_t truncatedPosition = (uint32_t)mRenderPosition;
int32_t deltaHalPosition = (int32_t)(halPosition - truncatedPosition);
if (deltaHalPosition > 0) {
mRenderPosition += deltaHalPosition;
}
// Scale from HAL sample rate to application rate.
*frames = mRenderPosition / mRateMultiplier;
return status;
}
// return bottom 32-bits of the render position
status_t AudioStreamOut::getRenderPosition(uint32_t *frames)
{
uint64_t position64 = 0;
status_t status = getRenderPosition(&position64);
if (status == NO_ERROR) {
*frames = (uint32_t)position64;
}
return status;
}
status_t AudioStreamOut::getPresentationPosition(uint64_t *frames, struct timespec *timestamp)
{
if (stream == NULL) {
return NO_INIT;
}
uint64_t halPosition = 0;
status_t status = stream->get_presentation_position(stream, &halPosition, timestamp);
if (status != NO_ERROR) {
return status;
}
// Adjust for standby using HAL rate frames.
// Only apply this correction if the HAL is getting PCM frames.
if (mHalFormatIsLinearPcm) {
uint64_t adjustedPosition = (halPosition <= mFramesWrittenAtStandby) ?
0 : (halPosition - mFramesWrittenAtStandby);
// Scale from HAL sample rate to application rate.
*frames = adjustedPosition / mRateMultiplier;
} else {
// For offloaded MP3 and other compressed formats.
*frames = halPosition;
}
return status;
}
status_t AudioStreamOut::open(
audio_io_handle_t handle,
audio_devices_t devices,
struct audio_config *config,
const char *address)
{
audio_stream_out_t *outStream;
int status = hwDev()->open_output_stream(
hwDev(),
handle,
devices,
flags,
config,
&outStream,
address);
ALOGV("AudioStreamOut::open(), HAL open_output_stream returned "
" %p, sampleRate %d, Format %#x, "
"channelMask %#x, status %d",
outStream,
config->sample_rate,
config->format,
config->channel_mask,
status);
if (status == NO_ERROR) {
stream = outStream;
mHalFormatIsLinearPcm = audio_is_linear_pcm(config->format);
ALOGI("AudioStreamOut::open(), mHalFormatIsLinearPcm = %d", (int)mHalFormatIsLinearPcm);
mHalFrameSize = audio_stream_out_frame_size(stream);
}
return status;
}
audio_format_t AudioStreamOut::getFormat() const
{
return stream->common.get_format(&stream->common);
}
uint32_t AudioStreamOut::getSampleRate() const
{
return stream->common.get_sample_rate(&stream->common);
}
audio_channel_mask_t AudioStreamOut::getChannelMask() const
{
return stream->common.get_channels(&stream->common);
}
int AudioStreamOut::flush()
{
ALOG_ASSERT(stream != NULL);
mRenderPosition = 0;
mFramesWritten = 0;
mFramesWrittenAtStandby = 0;
if (stream->flush != NULL) {
return stream->flush(stream);
}
return NO_ERROR;
}
int AudioStreamOut::standby()
{
ALOG_ASSERT(stream != NULL);
mRenderPosition = 0;
mFramesWrittenAtStandby = mFramesWritten;
return stream->common.standby(&stream->common);
}
ssize_t AudioStreamOut::write(const void *buffer, size_t numBytes)
{
ALOG_ASSERT(stream != NULL);
ssize_t bytesWritten = stream->write(stream, buffer, numBytes);
if (bytesWritten > 0 && mHalFrameSize > 0) {
mFramesWritten += bytesWritten / mHalFrameSize;
}
return bytesWritten;
}
} // namespace android
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