stagefright: Fix FFMPEG catchall decoders

 * Get this metadata properly flowing
 * Allows us to play tracks such as Apple Lossless :)

Change-Id: I2990b30eef5b672da339d24444424c61a43b85c2
stagefright: Increase raw codec buffer size

 * Enlarge the buffer to handle up to 6 channels of 32-bit data.
 * We should probably do this dynamically in the future.

Change-Id: Id1af10b52c4e71e811d0d034baf2d3f1388f4abd
Truncate file before recording into it.

Recording into an existing file of non-zero length could leave old
data in the file after the recording ends. Best case that wastes
space, worst case it results in a file that's considered corrupt
on playback.

Change-Id: I2c77a107603b2b36790958360ff0856c2b28d677
Fix AAC recording issue

Fix uninitialized variable that caused ADTS recording to incorrectly
specify LTP object in the header.

Bug: 17895547
Change-Id: I75650f4963f4f371cd191bc635e32c9ab17fa8c9