1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/*
**
** 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 "AudioHwDevice.h"
#include "AudioStreamOut.h"
#include "SpdifStreamOut.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);
virtual status_t getRenderPosition(uint32_t *frames);
virtual status_t getPresentationPosition(uint64_t *frames, struct timespec *timestamp);
/**
* 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);
virtual size_t getFrameSize();
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;
};
int mRateMultiplier;
MySPDIFEncoder mSpdifEncoder;
// Used to implement getRenderPosition()
int64_t mRenderPositionHal;
uint32_t mPreviousHalPosition32;
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
|
