Khronos OpenSL ES

OpenSLES是一款免版税、跨平台、硬件加速的音频API,专为嵌入式系统设计。它提供了一种标准化的高性能、低延迟的方法来访问移动多媒体设备上的音频功能,适用于游戏、音乐播放等多种应用。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

OpenSL ES - The Standard for Embedded Audio Acceleration

OpenSL ES™ is a royalty-free, cross-platform, hardware-accelerated audio API tuned for embedded systems. It provides a standardized, high-performance, low-latency method to access audio functionality for developers of native applications on embedded mobile multimedia devices, enabling straightforward cross-platform deployment of hardware and software audio capabilities, reducing implementation effort, and promoting the market for advanced audio.

OpenSL ES 1.1 at a glance

The OpenSL ES 1.1 specification and header files are available in the Khronos Registry The OpenSL ES 1.1 Quick Reference card.

OpenSL ES 1.0.1 at a glance

The OpenSL ES 1.0.1 specification and header files are available in the Khronos Registry

The need for OpenSL ES

Currently the market offers a diversified range of multimedia devices and fragmentation in the developer space is high. Application developers are constantly porting their audio source code across several proprietary APIs. Just playing a simple sound on different platforms requires different code. OpenSL ES addresses the limitations of platform and provides additional tangible benefits:

OpenSL ES Features

Features of OpenSL ES

  • Royalty-free, open audio application API for embedded mobile multimedia devices
  • Suitable for both hardware and software implementations
  • Application-oriented "developer" API that standardizes access to advanced audio functionality:
    • Mandated audio format across platforms providing consistency for developers, with support for optional formats
    • Interactive music and ringtones using SP-MIDI, Mobile DLS, Mobile XMF
    • 3D positional audio provided for gaming using OpenGL ES
  • Cross-platform foundation for a wide range of higher-level audio APIs including: Mobile Media API (JSR-135); Advanced Multimedia Supplements (JSR-234)
  • Extensible to handle new capabilities
  • Profiles (subset of features satisfying typical use cases for a given market segment) will allow market segement targeting

Target Applications

  • Gaming
  • Multimedia interactive applications (Mixers, composers, DJ apps)
  • Interactive audio
  • 3D audio
  • Music playback, including digital audio
  • Ring-tone playback
  • Recording: access to the audio inputs (e.g. microphone input)
  • Device UI audio support

Target Devices

  • Mobile phones (simple phones to music and game-phones)
  • Smart-phones & PDAs
  • Portable game consoles
  • Portable multimedia players/devices (e.g. MP3 players, i/net tablets etc...)

Target devices minimum requirements: 8MB of RAM; 100MHz embedded processor(s) ; Handheld form factor, supports applications; Audio output via speaker(s), headset/headphone; Networking support for streaming: wireless, Bluetooth;

where OpenSL ES fits in the developer world

Profiles

OpenSL ES will be deployed on a wide range of devices catering to different market segments. The profiles are: Phone, Music and Game.

Game Profile
Targeted at the game-centric mobile device market : Advanced MIDI functionality, sophisticated audio capabilities such as 3D audio, audio effects, ability to handle buffers of audio, etc

Music Profile
Targeted at the music-centric mobile device market - High quality audio, ability to support multiple music audio codecs, audio streaming support

Phone Profile
Targeted at the basic mobile phone market - Includes ringtone and alert tone playback (i.e. basic MIDI functionality), basic audio playback and record functionality, and simple 2D audio games.


资源下载链接为: https://pan.quark.cn/s/1bfadf00ae14 “STC单片机电压测量”是一个以STC系列单片机为基础的电压检测应用案例,它涵盖了硬件电路设计、软件编程以及数据处理等核心知识点。STC单片机凭借其低功耗、高性价比和丰富的I/O接口,在电子工程领域得到了广泛应用。 STC是Specialized Technology Corporation的缩写,该公司的单片机基于8051内核,具备内部振荡器、高速运算能力、ISP(在系统编程)和IAP(在应用编程)功能,非常适合用于各种嵌入式控制系统。 在源代码方面,“浅雪”风格的代码通常简洁易懂,非常适合初学者学习。其中,“main.c”文件是程序的入口,包含了电压测量的核心逻辑;“STARTUP.A51”是启动代码,负责初始化单片机的硬件环境;“电压测量_uvopt.bak”和“电压测量_uvproj.bak”可能是Keil编译器的配置文件备份,用于设置编译选项和项目配置。 对于3S锂电池电压测量,3S锂电池由三节锂离子电池串联而成,标称电压为11.1V。测量时需要考虑电池的串联特性,通过分压电路将高电压转换为单片机可接受的范围,并实时监控,防止过充或过放,以确保电池的安全和寿命。 在电压测量电路设计中,“电压测量.lnp”文件可能包含电路布局信息,而“.hex”文件是编译后的机器码,用于烧录到单片机中。电路中通常会使用ADC(模拟数字转换器)将模拟电压信号转换为数字信号供单片机处理。 在软件编程方面,“StringData.h”文件可能包含程序中使用的字符串常量和数据结构定义。处理电压数据时,可能涉及浮点数运算,需要了解STC单片机对浮点数的支持情况,以及如何高效地存储和显示电压值。 用户界面方面,“电压测量.uvgui.kidd”可能是用户界面的配置文件,用于显示测量结果。在嵌入式系统中,用
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值