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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.
*/
#pragma once
#include <stdint.h>
#include <sys/types.h>
#include <system/audio.h>
#include "AudioStreamOut.h"
#include <afutils/NBAIO_Tee.h>
#include <audio_utils/spdif/SPDIFEncoder.h>
namespace android {
/**
* Stream that is a PCM data burst in the HAL but looks like an encoded stream
* to the AudioFlinger. Wraps encoded data in an SPDIF wrapper per IEC61973-3.
*/
class SpdifStreamOut : public AudioStreamOut {
public:
SpdifStreamOut(AudioHwDevice *dev, audio_output_flags_t flags,
audio_format_t format);
status_t open(
audio_io_handle_t handle,
audio_devices_t devices,
struct audio_config *config,
const char *address) override;
/**
* Write audio buffer to driver. Returns number of bytes written, or a
* negative status_t. If at least one frame was written successfully prior to the error,
* it is suggested that the driver return that successful (short) byte count
* and then return an error in the subsequent call.
*
* If set_callback() has previously been called to enable non-blocking mode
* the write() is not allowed to block. It must write only the number of
* bytes that currently fit in the driver/hardware buffer and then return
* this byte count. If this is less than the requested write size the
* callback function must be called when more space is available in the
* driver/hardware buffer.
*/
ssize_t write(const void* buffer, size_t bytes) override;
/**
* @return frame size from the perspective of the application and the AudioFlinger.
*/
[[nodiscard]] size_t getFrameSize() const override { return sizeof(int8_t); }
/**
* @return audio_config_base_t from the perspective of the application and the AudioFlinger.
*/
[[nodiscard]] audio_config_base_t getAudioProperties() const override {
return mApplicationConfig;
}
/**
* @return format from the perspective of the application and the AudioFlinger.
*/
[[nodiscard]] virtual audio_format_t getFormat() const { return mApplicationConfig.format; }
/**
* The HAL may be running at a higher sample rate if, for example, playing wrapped EAC3.
* @return sample rate from the perspective of the application and the AudioFlinger.
*/
[[nodiscard]] virtual uint32_t getSampleRate() const { return mApplicationConfig.sample_rate; }
/**
* The HAL is in stereo mode when playing multi-channel compressed audio over HDMI.
* @return channel mask from the perspective of the application and the AudioFlinger.
*/
[[nodiscard]] virtual audio_channel_mask_t getChannelMask() const {
return mApplicationConfig.channel_mask;
}
status_t flush() override;
status_t standby() override;
private:
class MySPDIFEncoder : public SPDIFEncoder
{
public:
MySPDIFEncoder(SpdifStreamOut *spdifStreamOut, audio_format_t format)
: SPDIFEncoder(format)
, mSpdifStreamOut(spdifStreamOut)
{
}
ssize_t writeOutput(const void* buffer, size_t bytes) override
{
return mSpdifStreamOut->writeDataBurst(buffer, bytes);
}
protected:
SpdifStreamOut * const mSpdifStreamOut;
};
MySPDIFEncoder mSpdifEncoder;
audio_config_base_t mApplicationConfig = AUDIO_CONFIG_BASE_INITIALIZER;
ssize_t writeDataBurst(const void* data, size_t bytes);
#ifdef TEE_SINK
NBAIO_Tee mTee;
#endif
};
} // namespace android