blob: 7be449c5bd950d08b1f70b542dc999a00eb759c4 (
plain)
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
|
/*
* Copyright (C) 2007 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_AUDIO_BUFFER_PROVIDER_H
#define ANDROID_AUDIO_BUFFER_PROVIDER_H
#include <utils/Errors.h>
namespace android {
// ----------------------------------------------------------------------------
class AudioBufferProvider
{
public:
// FIXME merge with AudioTrackShared::Buffer, AudioTrack::Buffer, and AudioRecord::Buffer
// and rename getNextBuffer() to obtainBuffer()
struct Buffer {
Buffer() : raw(NULL), frameCount(0) { }
union {
void* raw;
short* i16;
int8_t* i8;
};
size_t frameCount;
};
virtual ~AudioBufferProvider() {}
// value representing an invalid presentation timestamp
static const int64_t kInvalidPTS = 0x7FFFFFFFFFFFFFFFLL; // <stdint.h> is too painful
// pts is the local time when the next sample yielded by getNextBuffer
// will be rendered.
// Pass kInvalidPTS if the PTS is unknown or not applicable.
// On entry:
// buffer != NULL
// buffer->raw unused
// buffer->frameCount maximum number of desired frames
// On successful return:
// status NO_ERROR
// buffer->raw non-NULL pointer to buffer->frameCount contiguous available frames
// buffer->frameCount number of contiguous available frames at buffer->raw,
// 0 < buffer->frameCount <= entry value
// On error return:
// status != NO_ERROR
// buffer->raw NULL
// buffer->frameCount 0
virtual status_t getNextBuffer(Buffer* buffer, int64_t pts = kInvalidPTS) = 0;
// Release (a portion of) the buffer previously obtained by getNextBuffer().
// It is permissible to call releaseBuffer() multiple times per getNextBuffer().
// On entry:
// buffer->frameCount number of frames to release, must be <= number of frames
// obtained but not yet released
// buffer->raw unused
// On return:
// buffer->frameCount 0; implementation MUST set to zero
// buffer->raw undefined; implementation is PERMITTED to set to any value,
// so if caller needs to continue using this buffer it must
// keep track of the pointer itself
virtual void releaseBuffer(Buffer* buffer) = 0;
};
// ----------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_AUDIO_BUFFER_PROVIDER_H
|
