libstagefright: Extended media support via FFMPEG

 * Original work by Michael Chen - https://github.com/omxcodec
 * Kitkat port from Android X86 project

libstagefright: add null checking to addPlugin

libstagefright: fix error handling of dlsym()

According 'man dlsym', a NULL return from dlsym() doesn't indicate an error.
The correct way to test for an error is to call dlerror() to clear any old
error conditions, then call dlsym(), and then call dlerror() again to check
whether its return value is not NULL.

libstagefright: add more media mimetypes

This is the first step to add the ffmpeg plugins.

libstagefright: add ExtractorPlugin

The patch allows to load an ExtractorPlugin to extend the functions of
DataSource::sniff and MediaExtractor. A plugin has to implement a C
function getExtractorPlugin to fill the MediaExtractor::Plugin struct.

The filename of the plugin could be specified by the
media.stagefright.extractor-plugin property.

Change-Id: I995a37a4f1ab4bba6ca3c24c7001a27a1e3ccb90

FLACExtractor: Add more sample rates support

In FLACExtractor.cpp, it has function to check file's sample rate.
If the input sample rate is not in its list, it will return "unsupported
sample rate" issue. Modify code to make other sample rates (100,1k,42k,46k)
pass the check

Issue: AXIA-1441
Change-Id: I48f91119275560ec6d00feb0dedc70d10aa55262
Signed-off-by: Xiaobing Feng <xiaobing.feng@windriver.com>
Signed-off-by: Matt Gumbel <matthew.k.gumbel@intel.com>

libstagefright: add ffmpeg components

libstagefright: add more decoders

Add support for wma, wmv, ra, ape, dts decoders.

Change-Id: Iaf48a806aa0cef7d9bcb848383fc3d778c8bd248

libstagefright: allow to use the extended extractor in priority

If the meta contains the string "extended-extractor-use",
use the extended extractor first.

add support for rv20, rv30

add ffmpeg heuristic decoder

Change-Id: I5eed11b563ca7f15d44bacfb795d6f3da08ab883

add HEVC(H.265) decoder and cleanup

Squashed the following commits of branch cm_maguro-10.1 from
https://github.com/omxcodec/android_frameworks_av.git
by Michael Chen <omxcodec@gmail.com>

defb904 remove MEDIA_MIMETYPE_AUDIO_MP2
8036958 add fetchUriFromFd func to get file name
91bc7d5 fix videoCompressionFormatString and audioCodingTypeString funcs
f03069f reset FRAME_DROP_FREQ to 0
718b99a add HEVC(H.265) decoder
84f8bf6 cleanup
f026c93 cleanup
440614a add debug info

Change-Id: Ie75db0778f633357e2280aef6d47a0fa3beb823e

AwesomePlayer: use AwesomeLocalRenderer for OMX.ffmpeg.* components

stagefright: Remove duplicate types from QC media defs

Change-Id: I50ecafe79a2985d0868a1ac82464d6ca448aa2c5