Change-Id: I47c5ae09ff620b46e42463654e1a073b59fb2191

Right now GUI boost interfers with test_codec running unboosted
by varying the CPU frequency.  This at least makes it more consistent
if run without user input.

Change-Id: I121615098d6bd72ccd13c4e665cc2e4d45d7b58c

Replaces the NATIVE_FREQUENCY constant with a configurable frequency.

The user may select 48000Hz if the hardware supports it. The default is
still 44100Hz and the minimum is 44100Hz. The setting is located in the
playback settings, under "Frequency".

"Frequency" was duplicated in english.lang for now to avoid having to
fix every .lang file for the moment and throwing everything out of sync
because of the new play_frequency feature in features.txt. The next
cleanup should combine it with the one included for recording and
generalize the ID label.

If the hardware doesn't support 48000Hz, no setting will be available.

On particular hardware where very high rates are practical and desireable,
the upper bound can be extended by patching.

The PCM mixer can be configured to play at the full hardware frequency
range. The DSP core can configure to the hardware minimum up to the
maximum playback setting (some buffers must be reserved according to
the maximum rate).

If only 44100Hz is supported or possible on a given target for playback,
using the DSP and mixer at other samperates is possible if the hardware
offers them.

Change-Id: I6023cf0c0baa8bc6292b6919b4dd3618a6a25622
Reviewed-on: http://gerrit.rockbox.org/479
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Tested-by: Michael Sevakis <jethead71@rockbox.org>

Boost only for tests and unboost immediately afterwards. It was leaving
the CPU boosted after exiting.

Change-Id: I010c4b975bd27e8990dc057ddd244dab233411ca

Creates a standard buffer passing, local data passing and messaging
system for processing stages. Stages can be moved to their own source
files to reduce clutter and ease assimilation of new ones. dsp.c
becomes dsp_core.c which supports an engine and framework for effects.

Formats and change notifications are passed along with the buffer so
that they arrive at the correct time at each stage in the chain
regardless of the internal delays of a particular one.

Removes restrictions on the number of samples that can be processed at
a time and it pays attention to destination buffer size restrictions
without having to limit input count, which also allows pcmbuf to
remain fuller and safely set its own buffer limits as it sees fit.
There is no longer a need to query input/output counts given a certain
number of input samples; just give it the sizes of the source and
destination buffers.

Works in harmony with stages that are not deterministic in terms of
sample input/output ratio (like both resamplers but most notably
the timestretch). As a result it fixes quirks with timestretch hanging
up with certain settings and it now operates properly throughout its
full settings range.
Change-Id: Ib206ec78f6f6c79259c5af9009fe021d68be9734
Reviewed-on: http://gerrit.rockbox.org/200
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Tested-by: Michael Sevakis <jethead71@rockbox.org>

On big-endian architecture, DSP output must be coverted to little-
endian first. DSP output is also always interleaved stereo, 16 bit,
NATIVE_FREQUENCY and wavinfo should be correct for this.

Also, use standard clip_sample_16 already available.

Change-Id: Ifa7b9fc77f0573070c7e79f059dc3000c437c42e

Change-Id: Idcd7b024edb7a550b42b935fadfb3d869bab14c6

1) change all keymaps to PLA
2) add alternative exit keymaps

Change-Id: I5cb8b1fcc515d2b6f9934482e72b80767b2c2fb0
Reviewed-on: http://gerrit.rockbox.org/158
Reviewed-by: Thomas Martitz <kugel@rockbox.org>

Change-Id: I8f2105fe3357f00d9e085444cd867bec0e2a7143

This reverts commit 84c77d40f512b5052edec1b9c283b0bea0b68b27.

The commit used an unrelated define which doesn't actually work.