Android Supported Media Formats安卓支持的影片格式(一)

Network Protocols网络协议

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The following network protocols are supported for audio and video playback:

• RTSP (RTP, SDP)
• HTTP/HTTPS progressive streaming 
• HTTP/HTTPS live streaming draft protocol:
  • MPEG-2 TS media files only
  • Protocol version 3 (Android 4.0 and above)
  • Protocol version 2 (Android 3.x)
  • Not supported before Android 3.0

Note: HTTPS is not supported before Android 3.1.

以下网络协议支持音频和视频播放:

• RTSP (RTP, SDP)

RTSP:实时流协议是一个应用层协议，用于控制具有实时特性的数据（例如 多媒体 流）的传送。

RTP: 实时传输协议RTP(Real-time Transport protocol)

SDP: 会话描述协议：为会话通知、会话邀请和其它形式的多媒体会话初始化等目的提供了多媒体会话描述。

下面的一些协议应该都是基于HTTP/HTTPS安全网络传输协议进行的，详细的一些网络协议请看这篇文章写得非常详细：http://blog.csdn.net/tjy1985/article/details/7996121

Core Media Formats（核心媒体格式）

从官网提供的这张表可以看做现在android支持的核心媒体格式有很多，以及 编码解码器的支持

 Core media format and codec support.

Type	Format / Codec	Encoder	Decoder	Details	Supported File Type(s) / Container Formats
Audio	AAC LC	•	•	Support for mono/stereo/5.0/5.1 content with standard sampling rates from 8 to 48 kHz.	• 3GPP (.3gp) • MPEG-4 (.mp4, .m4a) • ADTS raw AAC (.aac, decode in Android 3.1+, encode in Android 4.0+, ADIF not supported) • MPEG-TS (.ts, not seekable, Android 3.0+)
	HE-AACv1 (AAC+)	• (Android 4.1+)	•
	HE-AACv2 (enhanced AAC+)		•	Support for stereo/5.0/5.1 content with standard sampling rates from 8 to 48 kHz.
	AAC ELD (enhanced low delay AAC)	• (Android 4.1+)	• (Android 4.1+)	Support for mono/stereo content with standard sampling rates from 16 to 48 kHz
	AMR-NB	•	•	4.75 to 12.2 kbps sampled @ 8kHz	3GPP (.3gp)
	AMR-WB	•	•	9 rates from 6.60 kbit/s to 23.85 kbit/s sampled @ 16kHz	3GPP (.3gp)
	FLAC		• (Android 3.1+)	Mono/Stereo (no multichannel). Sample rates up to 48 kHz (but up to 44.1 kHz is recommended on devices with 44.1 kHz output, as the 48 to 44.1 kHz downsampler does not include a low-pass filter). 16-bit recommended; no dither applied for 24-bit.	FLAC (.flac) only
	MP3		•	Mono/Stereo 8-320Kbps constant (CBR) or variable bit-rate (VBR)	MP3 (.mp3)
	MIDI		•	MIDI Type 0 and 1. DLS Version 1 and 2. XMF and Mobile XMF. Support for ringtone formats RTTTL/RTX, OTA, and iMelody	• Type 0 and 1 (.mid, .xmf, .mxmf) • RTTTL/RTX (.rtttl, .rtx) • OTA (.ota) • iMelody (.imy)
	Vorbis		•		• Ogg (.ogg) • Matroska (.mkv, Android 4.0+)
	PCM/WAVE	• (Android 4.1+)	•	8- and 16-bit linear PCM (rates up to limit of hardware). Sampling rates for raw PCM recordings at 8000, 16000 and 44100 Hz.	WAVE (.wav)
Image	JPEG	•	•	Base+progressive	JPEG (.jpg)
	GIF		•		GIF (.gif)
	PNG	•	•		PNG (.png)
	BMP		•		BMP (.bmp)
	WebP	• (Android 4.0+) (Lossless, Transparency, Android 4.2.1+)	• (Android 4.0+) (Lossless, Transparency, Android 4.2.1+)		WebP (.webp)
Video	H.263	•	•		• 3GPP (.3gp) • MPEG-4 (.mp4)
	H.264 AVC	• (Android 3.0+)	•	Baseline Profile (BP)	• 3GPP (.3gp) • MPEG-4 (.mp4) • MPEG-TS (.ts, AAC audio only, not seekable, Android 3.0+)
	MPEG-4 SP		•		3GPP (.3gp)
	VP8	• (Android 4.3+)	• (Android 2.3.3+)	Streamable only in Android 4.0 and above	• WebM (.webm) • Matroska (.mkv, Android 4.0+)

Video Encoding Recommendations

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lists examples of video encoding profiles and parameters that the Android media framework supports for playback in the H.264 Baseline Profile codec. While table 3 lists examples that the framework supports for playback in the VP8 media codec.

In addition to these encoding parameter recommendations, a device's available video recording profiles can be used as a proxy for media playback capabilities. These profiles can be inspected using the CamcorderProfileclass, which is available since API level 8.

视频编码资料和参数

列出的例子视频编码资料和参数,Android媒体回放的框架支持H.264资料编解码器。表3列出的例子,该框架支持VP8媒体回放的编解码器。

除了这些编码参数的建议,提供设备的录像资料可以作为代理媒体播放功能。这些概要文件可以检查使用CamcorderProfile类,可以从API级别8。

支持H.264视频编解码器参数资料。

Table 2. Examples of supported video encoding parameters for the H.264 Baseline Profile codec.

	SD (Low quality)	SD (High quality)	HD 720p (N/A on all devices)
Video resolution	176 x 144 px	480 x 360 px	1280 x 720 px
Video frame rate	12 fps	30 fps	30 fps
Video bitrate	56 Kbps	500 Kbps	2 Mbps
Audio codec	AAC-LC	AAC-LC	AAC-LC
Audio channels	1 (mono)	2 (stereo)	2 (stereo)
Audio bitrate	24 Kbps	128 Kbps	192 Kbps

支持VP8视频编解码器参考资料

Table 3. Examples of supported video encoding parameters for the VP8 codec.

	SD (Low quality)	SD (High quality)	HD 720p (N/A on all devices)	HD 1080p (N/A on all devices)
Video resolution	320 x 180 px	640 x 360 px	1280 x 720 px	1920 x 1080 px
Video frame rate	30 fps	30 fps	30 fps	30 fps
Video bitrate	800 Kbps	2 Mbps	4 Mbps	10 Mbps