You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
122 lines
3.9 KiB
122 lines
3.9 KiB
/*
|
|
**
|
|
** 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.
|
|
*/
|
|
|
|
#ifndef ANDROID_SPDIF_STREAM_OUT_H
|
|
#define ANDROID_SPDIF_STREAM_OUT_H
|
|
|
|
#include <stdint.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <system/audio.h>
|
|
|
|
#include "AudioStreamOut.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);
|
|
|
|
virtual ~SpdifStreamOut() { }
|
|
|
|
virtual status_t open(
|
|
audio_io_handle_t handle,
|
|
audio_devices_t devices,
|
|
struct audio_config *config,
|
|
const char *address);
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
virtual ssize_t write(const void* buffer, size_t bytes);
|
|
|
|
/**
|
|
* @return frame size from the perspective of the application and the AudioFlinger.
|
|
*/
|
|
virtual size_t getFrameSize() const { return sizeof(int8_t); }
|
|
|
|
/**
|
|
* @return format from the perspective of the application and the AudioFlinger.
|
|
*/
|
|
virtual audio_format_t getFormat() const { return mApplicationFormat; }
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
virtual uint32_t getSampleRate() const { return mApplicationSampleRate; }
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
virtual audio_channel_mask_t getChannelMask() const { return mApplicationChannelMask; }
|
|
|
|
virtual status_t flush();
|
|
virtual status_t standby();
|
|
|
|
private:
|
|
|
|
class MySPDIFEncoder : public SPDIFEncoder
|
|
{
|
|
public:
|
|
MySPDIFEncoder(SpdifStreamOut *spdifStreamOut, audio_format_t format)
|
|
: SPDIFEncoder(format)
|
|
, mSpdifStreamOut(spdifStreamOut)
|
|
{
|
|
}
|
|
|
|
virtual ssize_t writeOutput(const void* buffer, size_t bytes)
|
|
{
|
|
return mSpdifStreamOut->writeDataBurst(buffer, bytes);
|
|
}
|
|
protected:
|
|
SpdifStreamOut * const mSpdifStreamOut;
|
|
};
|
|
|
|
MySPDIFEncoder mSpdifEncoder;
|
|
audio_format_t mApplicationFormat;
|
|
uint32_t mApplicationSampleRate;
|
|
audio_channel_mask_t mApplicationChannelMask;
|
|
|
|
ssize_t writeDataBurst(const void* data, size_t bytes);
|
|
ssize_t writeInternal(const void* buffer, size_t bytes);
|
|
|
|
};
|
|
|
|
} // namespace android
|
|
|
|
#endif // ANDROID_SPDIF_STREAM_OUT_H
|