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15632dcc
编写于
5月 09, 2022
作者:
杨
杨帅
提交者:
Gitee
5月 09, 2022
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Signed-off-by: yangshuai<yangshuai67@huawei.com>
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zh-cn/application-dev/media/opensles-playback.md
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15632dcc
# OpenSL
ES音频播放开发指导
OpenSL
ES音频播放开发指导
##
场景介绍
场景介绍
OpenSL ES™ 是无授权费、跨平台、针对嵌入式系统精心优化的硬件音频加速API。
开发者可以通过本文了解到在OpenHarmony如何使用OpenSL ES进行音频播放相关操作;当前仅实现了部分OpenSL ES接口,未实现接口调用后会返回SL_RESULT_FEATURE_UNSUPPORTED
## 开发步骤
以下步骤描述了在
**openHarmony**
如何使用
**OpenSLES**
开发音频播放功能:
1.
使用
**slCreateEngine**
接口和获取
**engine**
实例。
```
c++
SLObjectItf
engineObject
=
nullptr
;
slCreateEngine
(
&
engineObject
,
0
,
nullptr
,
0
,
nullptr
,
nullptr
);
(
*
engineObject
)
->
Realize
(
engineObject
,
SL_BOOLEAN_FALSE
);
```
2.
获取接口
**SL_IID_ENGINE**
的
**engineEngine**
实例
```
c++
SLEngineItf
engineEngine
=
nullptr
;
(
*
engineObject
)
->
GetInterface
(
engineObject
,
SL_IID_ENGINE
,
&
engineEngine
);
```
3.
配置播放器信息,创建
**AudioPlayer**
。
```
c++
SLDataLocator_BufferQueue
slBufferQueue
=
{
SL_DATALOCATOR_BUFFERQUEUE
,
0
};
//具体参数需要根据音频文件格式进行适配
SLDataFormat_PCM
pcmFormat
=
{
SL_DATAFORMAT_PCM
,
2
,
48000
,
16
,
0
,
0
,
0
};
SLDataSource
slSource
=
{
&
slBufferQueue
,
&
pcmFormat
};
SLObjectItf
pcmPlayerObject
=
nullptr
;
(
*
engineEngine
)
->
CreateAudioPlayer
(
engineEngine
,
&
pcmPlayerObject
,
&
slSource
,
null
,
0
,
nullptr
,
nullptr
);
(
*
pcmPlayerObject
)
->
Realize
(
pcmPlayerObject
,
SL_BOOLEAN_FALSE
);
```
4.
获取接口
**SL_IID_OH_BUFFERQUEUE**
的
**bufferQueueItf**
实例
```
SLOHBufferQueueItf bufferQueueItf;
(*pcmPlayerObject)->GetInterface(pcmPlayerObject, SL_IID_OH_BUFFERQUEUE, &bufferQueueItf);
```
5.
打开音频文件,注册
**BuqqerQueueCallback**
回调
```
c++
FILE
*
wavFile_
=
nullptr
;
static
void
BuqqerQueueCallback
(
SLOHBufferQueueItf
bufferQueueItf
,
void
*
pContext
,
SLuint32
size
)
{
FILE
*
wavFile
=
(
FILE
*
)
pContext
;
if
(
!
feof
(
wavFile
))
{
SLuint8
*
buffer
=
nullptr
;
SLuint32
pSize
=
0
;
(
*
bufferQueueItf
)
->
GetBuffer
(
bufferQueueItf
,
&
buffer
,
pSize
);
//从文件读取数据
fread
(
buffer
,
1
,
size
,
wavFile
);
(
*
bufferQueueItf
)
->
Enqueue
(
bufferQueueItf
,
buffer
,
size
);
}
return
;
}
//wavFile_ 需要设置为用户想要播放的文件描述符
wavFile_
=
fopen
(
path
,
"rb"
);
(
*
bufferQueueItf
)
->
RegisterCallback
(
bufferQueueItf
,
BuqqerQueueCallback
,
wavFile_
);
```
6.
获取接口
**SL_PLAYSTATE_PLAYING**
的
**playItf**
实例,开始播放
```
c++
SLPlayItf
playItf
=
nullptr
;
(
*
pcmPlayerObject
)
->
GetInterface
(
pcmPlayerObject
,
SL_IID_PLAY
,
&
playItf
);
(
*
playItf
)
->
SetPlayState
(
playItf
,
SL_PLAYSTATE_PLAYING
);
```
7.
结束音频播放
```
c++
(
*
playItf
)
->
SetPlayState
(
playItf
,
SL_PLAYSTATE_STOPPED
);
(
*
pcmPlayerObject
)
->
Destroy
(
pcmPlayerObject
);
(
*
engineObject
)
->
Destroy
(
engineObject
);
```
[
**OpenSLES** 音频播放代码 demo
](
https://gitee.com/openharmony/multimedia_audio_standard/blob/master/services/test/audio_opensles_test.cpp
)
\ No newline at end of file
开发步骤
以下步骤描述了在OpenHarmony如何使用OpenSL ES开发音频播放功能:
1.
添加头文件
#include
<OpenSLES.h>
#include
<OpenSLES_OpenHarmony.h>
#include
<OpenSLES_Platform.h>
2.
使用 slCreateEngine 接口和获取 engine 实例。
SLObjectItf engineObject = nullptr;
slCreateEngine(&engineObject, 0, nullptr, 0, nullptr, nullptr);
(
*
engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
3.
获取接口 SL_IID_ENGINE 的 engineEngine 实例
SLEngineItf engineEngine = nullptr;
(
*
engineObject)->GetInterface(engineObject, SL_IID_ENGINE,
&engineEngine);
4.
配置播放器信息,创建 AudioPlayer 。
SLDataLocator_BufferQueue slBufferQueue = {
SL_DATALOCATOR_BUFFERQUEUE,
0
};
//具体参数需要根据音频文件格式进行适配
SLDataFormat_PCM pcmFormat = {
SL_DATAFORMAT_PCM,
2,
48000,
16,
0,
0,
0
};
SLDataSource slSource = {&slBufferQueue,
&pcmFormat};
SLObjectItf pcmPlayerObject = nullptr;
(
*
engineEngine)->CreateAudioPlayer(engineEngine, &pcmPlayerObject, &slSource, null, 0, nullptr, nullptr);
(
*
pcmPlayerObject)->Realize(pcmPlayerObject, SL_BOOLEAN_FALSE);
5.
获取接口 SL_IID_OH_BUFFERQUEUE 的 bufferQueueItf 实例
SLOHBufferQueueItf bufferQueueItf;
(
*
pcmPlayerObject)->GetInterface(pcmPlayerObject, SL_IID_OH_BUFFERQUEUE,
&bufferQueueItf);
6.
打开音频文件,注册 BuqqerQueueCallback 回调
FILE
*
wavFile_ = nullptr;
static void BuqqerQueueCallback (SLOHBufferQueueItf bufferQueueItf, void
*
pContext, SLuint32 size)
{
FILE
*wavFile = (FILE *
)pContext;
if (!feof(wavFile)) {
SLuint8
*
buffer = nullptr;
SLuint32 pSize = 0;
(
*
bufferQueueItf)->GetBuffer(bufferQueueItf, &buffer, pSize);
//从文件读取数据
fread(buffer, 1, size, wavFile);
(
*
bufferQueueItf)->Enqueue(bufferQueueItf, buffer, size);
}
return;
}
//wavFile_ 需要设置为用户想要播放的文件描述符
wavFile_ = fopen(path, "rb");
(
*
bufferQueueItf)->RegisterCallback(bufferQueueItf, BuqqerQueueCallback, wavFile_);
7.
获取接口 SL_PLAYSTATE_PLAYING 的 playItf 实例,开始播放
SLPlayItf playItf = nullptr;
(
*
pcmPlayerObject)->GetInterface(pcmPlayerObject, SL_IID_PLAY,
&playItf);
(
*
playItf)->SetPlayState(playItf, SL_PLAYSTATE_PLAYING);
8.
结束音频播放
(
*
playItf)->SetPlayState(playItf, SL_PLAYSTATE_STOPPED);
(
*
pcmPlayerObject)->Destroy(pcmPlayerObject);
(
*
engineObject)->Destroy(engineObject);
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