1、工作目标
1.1、封装ON2 API以使在Ubuntu和Android中ffmpeg能用硬件解码多种格式视频文件。
即能使用ON2来解码如下格式的文件：H264，MPEG-1，MPEG-2，MPEG-4，H263，Sorensen Spark，DivX，RV，VC-1
表1
| Standard | Decoder support |
| H.264 profile and level | • Baseline Profile, levels 1 - 4.1 |
| • Main Profile, levels 1 - 4.1 | |
| • High Profile, levels 1 - 4.1 | |
| SVC profile and level | • Scalable Baseline Profile, base layer only |
| MPEG-4 visual profile and level | • Simple Profile, levels 0 - 6 |
| • Advanced Simple Profile, levels 0 - 5 | |
| MPEG-2 profile and level | • Main Profile, low, medium and high levels |
| MPEG-1 profile and level | • Main Profile, low, medium and high levels |
| H.263 profile and level | • Main Profile, low, medium and high levels |
| Sorenson Spark profile and level | • Main Profile, low, medium and high levels |
| VC-1 profile and level | • Simple Profile, low, medium and high levels |
| • Main Profile, low, medium and high levels | |
| • Advanced Profile, levels 0-3 | |
| JPEG profile and level | • Simple Profile, low, medium and high levels |
| • Main Profile, low, medium and high levels | |
| • Advanced Profile, levels 0-4 | |
| RV profile and level | • RV8 |
| • RV9 | |
| • RV10 | |
| VP6 profile and level | • VP6.0 (Simple Profile) |
| • VP6.1 | |
| • VP6.2 (Advanced Profile) | |
| DivX ® profile and level | • DivX Home Theater Profile Qualified TM |
| • DivX3 | |
| • DivX4 | |
| • DivX5 | |
| • DivX6 |
2、工作内容
2.1、Ubuntu
封装ON2 API到ffmpeg中使Gstreamer&Mplayer能硬解h264&mpeg2视频，以满足演示的需要。
2.1.1 方案
出于任务时间和工作复杂度以及后期维护性的考虑，修改当前ffmpeg中匹配的decoder，
使其直接调用on2 api进行解码，而不是重新开发做一个decoder来专门处理on2支持的格式。
如下图：
图1 
2.2 Android
封装ON2 API到omx中使stagefright能使用on2解码视频。
2.2.1 在系统中的位置
图2 
