It turns out #include "settings.h" pulls in rbpaths.h which ends up
remapping open() to the path-mangling rockbox open().
By defining RB_FILESYSTEM_OS we prevent the remap. My mistake for not
testing this before committing!
Change-Id: I2978eb7b413693c4cb887b7ac7b2457780db7d25
With a full-scale 440Hz tone, the line out voltage
measured approx. 5.8Vpp at the 0 setting. WAY too hot!
(9 dBV, in fact)
For 0.894Vpp (-10 dBV - consumer devices), -18 appears to be
about right for line level signals, but for "pro" equipment
a different level may be desired.
Therefore, the user to cap the line out level by re-using the global
volume limit setting.
Change-Id: I0d1d6482ea95537e9a2d00884eaee2713771c614
Inline assembly in RoLO and the FiiO M3K bootloader used 'jr' to
jump to a newly loaded Rockbox binary, but incorrectly left the
branch delay slot open. That gives GCC an opening to place illegal
instrutions, etc, which might cause an unhandled exception.
Change-Id: Ia7a561fe530e94a41189d25f18a767c448177960
- Proper error codes are now returned from all functions. These codes will
be used by a host-side flash tool for error reporting.
- nand_erase_block() was replaced by nand_erase_bytes(). The caller can't
know how big an eraseblock is with the current API, so next best thing
is to verify the correct alignment inside the call and reject the erase
if it isn't properly aligned.
- Fixed typo in nandcmd_block_erase() which would cause an SFC error to be
interpreted as success. Yikes.
Change-Id: Id4ac9b44fa7fc2fcb81ff19ba730df78457c0383
Ensure the default setting reflects what the service manual says the
official battery capacity is. Change the ranges to reflect what
replacement batteries are actually available.
This range is actually much shorter in reality due to these units
requiring the rarer 3 pin battery type that uses a thermistor. As such
there's only one real replacement battery for each.
So the HDD1630 caps out around 700 mah while the HDD6330 caps out around
680 mah.
Change-Id: I2dbbba83ad2cd6e1d84e3481c4af84a06c45e16b
headphone ADC thread stack was slightly too small. Bump it up a bit.
(it was _perfectly_ sized for the prior older toolchain+optimization flags...)
Change-Id: I2ca67c2b85c54f879892a31e281d7696f893389c
Use of IF_COP_CORE was mistakenly introduced as part of 89acde6af2,
effectively short-circuiting multiple tests resulting in the code
paths always being executed, on both cores.
Use the correct macro, so per-CPU paths are handled properly.
Change-Id: Id346cf759fc1b06b7d56694d7af1f469caf785a4
This appears to finally fix the issue
turns out the status register we were writing was only for the CPU
COP cache flush wiped out the CPU cache
--
Added some defines to cut down on the magic numbers
Added some comments explaining such
Set the address to full 20 bit address
0x1FFFFF which is then left shifted 11 internally -- somewhere around 4GB?
Link explains the cache status bits
https://daniel.haxx.se/sansa/memory_controller.txt
Change-Id: I57b7187c2f71a5b54ce145bf3a21ed492a8993cb
Enable its use in the jz47xx MIPS targets.
(accidently committed g#3249 before making these changes)
Change-Id: I1791946f632901f0c7a94b04b009671aa0d71717
This is just a minor cleanup of Solomon Peachy's code, and using
per-filesystem buffers instead of a single static buffer.
Tested and working on the FiiO M3K.
Change-Id: I3c19e8cc24e2f8aa07668c9d1c6d63364815050a
This uses the new unicode string literal feature that is available
now to greatly simplify the initialization of these special string
types. This makes them much more readable at a quick glance.
Change-Id: Iad8b49aa763486608e3bb7e83fb8abfb48ce0a7b
-- apparenty 0x4 aligned doesn't work properly
requires 0x8 alignment at least for the h10 20gb
but enabled for all processors that define MEM_ALIGN_ATTR
Change-Id: I11edaab183b91a6d158f1f439f173b9b699dc914
-- apparenty 0x4 aligned doesn't work properly
requires 0x8 alignment at least for the h10 20gb
but enabled for all arm processors
assign the default framebuffer to the default_vp as well
Change-Id: I0b76c30f2ddb5d6d2f7c6a132e4081aee58da17b
In the old position of the call, the first battery reading would
be made before initializing the target's power management code.
If the target needs to initialize before giving a battery reading,
then the first reading would be wrong and the power thread might
inappropriately shut down based on a false zero reading.
The new position avoids forcing special-case logic onto the target
power management code.
Change-Id: I483cfabe30c6881d80a1094fd526fa0065523d19
This allows the user to make use of the DAC's power-saving abilities.
The two modes are "high performance" and "battery saver". This feature
is supported by the AK4376 DAC in the upcoming FiiO M3K port.
The setting is only a manual toggle right now, but in the future it
could be hooked up to the battery level (via another setting) so it
can be toggled automatically when the battery gets too low.
Change-Id: I482af6e2f969fcbdeb3411bd3ff91f866b12d027
The storage subsystem aggressively issues SLEEPNOW events when idle
and power off happened a fixed 2s later. This turns out to not be
enough time for FC1307A (eg iFlash) adapters to flush outstanding writes.
So, when we detect a lack of PM support, increase the poweroff delay to
5 seconds to compensate for not being able to issue the ATA SLEEP command.
Hopefully this is enough time. If not, we will have to re-disable PM
entirely when we detect these popular adapters. Thankfully that is now
just an #ifdef away.
Change-Id: I4112b9acb965973d81f70483bd9d595461c7301c
It's possible to get up to 3000mAh batteries for this device, although
it requires that you use an iFlash adapter to make enough space.
Signed-off-by: Caleb Connolly <caleb@connolly.tech>
Change-Id: I0d0d02aa30caffcae4a7e8c805516a1266eef359
The FC1307A ATA->SD chipset (used by the common iFlash adapters)
doesn't support mandatory ATA power management commands, leading to
massive data corruption if they were issued.
A workaround was identified (54629073ae) that basically disabled all of
rockbox's power management code for these adapters, which extends well
beyond the specific ATA commands issued.
This patch moves the gating test to the issuance of the actual SLEEP,
so that the rest of rockbox's PM code can function as intended. This
allows the device to get powered down when idle, yielding potentially
significant improvements in battery life.
Change-Id: Ia13e2405243fe5efe6f68c3a549ab4933567790b
* PREV/NEXT now swapped so they do what is expected in most contexts
* List and setting context retains prior behavior
* Enable the ADC that reads the headset remote and map the keys.
* As ADC-based remote "events" arrive as press/release pairs,
delay the button release.
Change-Id: I22d4eac3bfe1573b50eca795cf377bdafdeb5336
affects all hiby targets, fiiom3k, and ibasso dx50/dx90
As well as deduplicating a small pile of code, this also implements
hysteresis so we're not doing a sysfs read/lookup multiple times
back-to-back every time the power management tick fires.
Change-Id: I2f7672acbb36341becf67e07960c24c681270d09
This means we will no longer send them routinely and instead rely on
the HID driver to send them when the host requests it. This also
moves the reporting out of the power management code where it probably
did not belong in the first place.
Change-Id: I9c8420e81897f1f6caaa55ffacc7525589f1ef75
Previously these were placed in DRAM, which is overwritten by RoLo
when it loads a new image, but RoLo must call commit_discard_idcache()
after loading the image.
Change-Id: I5dcc4ca711b774166f83c668695edbcabfab2604
This allows rockbox to report its battery status through the
HID Battery Strength method that is available through the
Device Controls usage page.
Change-Id: Ia7a7dd9b9d476dd9df5a5f5becabc5ae823e9a89
SSDs that respect powermgmt commands should be treated the same, as the
powermgmt commands are an important part of ensuring it's safe to shut
down.
And greatly expand the comment explaining things.
Change-Id: Ia52b99fca802f495422b5ee097390a72dbc28f61
Commit 5462907 made sure that SLEEP commands weren't issued on devices that don't support ATA power management commands (e.g. certain CF->SD converters including several iFlash models).
Since Rockbox waits for the disk to become inactive in shutdown_hw(), which won't happen in this case, the OS would previously stall during the shutdown process until a timeout was reached.
Change-Id: I03bb05f6f6401bb8f0da5d0b76bd3f07681fdc06
The filesystem API often passes in unaligned receive buffers, and some
code (eg BMP reader) processes data in-place, leading to data loss when
we dropped the cache.
(And document exactly what we're doing, so we don't go through this again
at $future_date)
Change-Id: If47a7f2148a5a1a43777f0bd3be1bdfe8239e91e
Since that encompasses _all_ of our native targets in a post-archos world,
either replace it with #if (CONFIG_PLATFORM & PLATFORM_NATIVE) or
delete it altogher as appropriate.
Change-Id: I9128a456e850d5c96a9e05806aad3acd923f90c5
In fixing the original bug I tried to optimize discard_dcache_range()
to minimize writeback and inadvertently introduced a second bug, which
typically ends in a TLB refill panic.
It occurs only if the range fits within one cache line, and when both
the start and end of the range are not aligned to a cache line. This
causes ptr to be incremented and end to be decremented, so ptr > end,
and the loop can't terminate.
Change-Id: Ibaac072f1369268d3327d534ad08ef9dcee3db65
- The range-based cache operations on MIPS were broken and only worked
properly when BOTH the address and size were multiples of the cache
line size. If this was not the case, the last cache line of the range
would not be touched!
Fix is to align start/end pointers to cache lines before iterating.
- To my knowledge all MIPS processors have a cache, so I enabled
HAVE_CPU_CACHE_ALIGN by default. This also allows mmu-mips.c to use
the CACHEALIGN_UP/DOWN macros.
- Make jz4760/system-target.h define its cache line size properly.
Change-Id: I1fcd04a59791daa233b9699f04d5ac1cc6bacee7
ATA DMA was enabled for all PP502x targets in d118f47 after previously reported instabilities were thought to have been fixed. The iPod 4G target remains unstable when UDMA 2 is enabled. File system corruption will eventually occur even using stock hardware in normal usage, according to both my own experience and that of several other forum users. UDMA 1 appears to be stable.
Change-Id: I8526bad9e879f5dad5174cfe07cd8828d8b72406
Without this, if a device is left plugged in and idle, unplugging it will
trigger an immediate shutdown.
Change-Id: I65caaa0c1473562ec5d0bb776b01d4d222d69965
Basically no longer treat SCROLL_FWD/BACK as "button" events, instead
relying on the scrollwheel hooks to handle things properly.
Change-Id: I9bf18595ab3ca68e912f6dfb1f2eac2544578e73
Before this was just implemented inline wherever it was needed. Now
it is provided as 2 inline functions in a header called checksum.h.
There should be no differences in actual behavior.
Change-Id: I5d756cc01dc6225f5cc8b6af90911a3fc7b57cd5
* Bump internal mix buffer size by 4x, to 1K frames (matching ALSA period)
* Handle an underrun that occurs when filling the audio buffer
* Log underruns and make them available in the debug info
Change-Id: I28d56dd35d88851fa167ad92368a5882937a758f
It's not large enough on some targets.
(this will be revisited when the USB insertion prompt stuff is moved
out of the USB helper and over to the main thread)
Change-Id: Iefed2cdf2fbb4ce92569fc5cacbdb479b7d24e61
This removes all the pre-release bootloader of version 7 and
replaces them with production releases of version 8. The
pre-releases have their own problems and should be left
behind as they were never officially released.
Change-Id: If96531ba63cf4401d04133bda94735fe94ae4de1
This makes it so the thread cached variable is only read if building
the regular firmware. For bootloaders the data is now read directly.
This fixes the functions for bootloaders so they do not have to import
the power management code just so these functions will work when in
the bootloader.
Change-Id: Ic425b02c08b48df7a11a6c19c022b0e1cb316a85
v3: Add in config option
v4: Bugfixes
v5: Force a redraw upon exiting
v6: keypress-in-chargeonly mode enables mass storage (and vice versa)
v7: Fix bootloader builds
v8: Update manual, and have bootloader respect keypresses
v9: Change default to mass storage (ie no change in behavior)
todo:
* test-build dx50/dx90
* Switch from yes/no to proper menu?
* prevent WPS progress bar from drawing over us
Change-Id: I82e0ccb08497b7a5aa756ce77f1332ee963703a7
...
Change-Id: I7946cf240b18a4fa8ace5e25e1eb6e97b8b12d7c
This was introduced in e13c600133 back
when the author was trying to optimize the LCD code with DMA. For
whatever reason this broke the bootloader for the last 10 years or so
and no one could figure out why. This is now fixed.
However the bootloader is still currently broken in HEAD due to recent
changes to the LCD code. A fix for that is not yet known.
Change-Id: I046d53f9f391f558c391f2fadb6b260fe3be4d92
* pcm_get_bytes_remaining()
* pcm_calculate_peaks()
* pcm_get_peak_buffer()
Nothing in-tree uses these at all (except for the lua plugin wrapper)
Change-Id: I971b7beed6760250c8b1ce58f401a601e1e2d585
This overhauls most of the code to be easier to understand in terms
of the interactions with the flash. I found the original to be rather
confusing with how it kept switching between byte and word offsets.
My solution was to make all external access to the flash in terms of
sectors and bytes. Whatever the flash uses internally is now handled
by the subroutines for performing the erase, program, and verify
operations.
This helps make it far more consistent for the code that actually uses
these operations as they do not need to concern themselves with word
sizes and offsets anymore.
As a side effect of this change the flash operations are now done
entirely by subroutines; even the batch operations that used to use
custom loops.
Additionally some functions were merged with other functions in order
to reduce the amount of functions as well as consolidating common
code fragments.
Change-Id: I4698e920a226a3bbe8070004a14e5848abdd70ec
Some mSATA adapters seem to have trouble working with Rockbox using our
normal PIO timings; the timing value we use is probably out of spec and
is different to the OF. Switch to using the OF's timings according to
which PIO mode we select. This may not completely resolve problems with
these adapters but allows Rockbox to boot and play audio.
Change-Id: If73210700eb4af01864b373709ee1d15c775fb11
Also audiohw driver to specific device name, rewrite alsa controls code to
cache more data, thus making the code easier and use less stack. Avoid using
short/long in pcm alsa code since it's the wrong size on 64-bit (simulator
for example)
Change-Id: Ibc1ec44396e37b6cbdedbcf37300878638e5d2d3
several issues I saw that could pontentially cause problems
scroll engine doesn't take text height into account when checking bounds
NBELEMS was one whole row too large hopefully I got them right this time
Change-Id: If303da8320429c3964fc675351cb088d46303745
Nothing in the core has used it for some time. It's exported to the
plugin API but the last plugins to use it were switched to the mixer API
back in 2011.
This allows us to get rid of pcm_play_dma_pause() from all audio drivers
Change-Id: Ic3fa02592316f84963e41d792d1cabb436d1ff6b
Basically we're overflowing IRAM by 48 bytes. Shrink the stack
by 48 bytes to compensate.
Fixing this properly will require careful decisions about what
(code and/or data) to eject from IRAM.
Change-Id: Ia3054280bcbd9813b9cce83f16ba4fbd15085110
I'm currently running up against the limitations of the lcd_draw functions
I want these functions to be able to be used on any size buffer not
just buffers with a stride matching the underlying device
[DONE] allow the framebuffer to be decoupled from the device framebuffer
[DONE need examples] allow for some simple blit like transformations
[DONE] remove the device framebuffer from the plugin api
[DONE}ditto remote framebuffer
[DONE] remove _viewport_get_framebuffer you can call struct *vp = lcd_set_viewport(NULL) and vp->buffer->fb_ptr
while remote lcds may compile (and work in the sim) its not been tested on targets
[FIXED] backdrops need work to be screen agnostic
[FIXED] screen statusbar is not being combined into the main viewport correctly yet
[FIXED] screen elements are displayed incorrectly after switch to void*
[FIXED] core didn't restore proper viewport on splash etc.
[NEEDS TESTING] remote lcd garbled data
[FIXED] osd lib garbled screen on bmp_part
[FIXED] grey_set_vp needs to return old viewport like lcd_set_viewport
[FIXED] Viewport update now handles viewports with differing buffers/strides by copying to the main buffer
[FIXED] splash on top of WPS leaves old framebuffer data (doesn't redraw)
[UPDATE] refined this a bit more to have clear_viewport set the clean bit and have skin_render do its own screen clear
scrolling viewports no longer trigger wps refresh
also fixed a bug where guisyncyesno was displaying and then disappearing
[ADDED!] New LCD macros that allow you to create properly size frame buffers in you desired size without wasting bytes
(LCD_ and LCD_REMOTE_)
LCD_STRIDE(w, h) same as STRIDE_MAIN
LCD_FBSTRIDE(w, h) returns target specific stride for a buffer W x H
LCD_NBELEMS(w, h) returns the number of fb_data sized elemenst needed for a buffer W x H
LCD_NATIVE_STRIDE(s) conversion between rockbox native vertical and lcd native stride (2bitH)
test_viewports.c has an example of usage
[FIXED!!] 2bit targets don't respect non-native strides
[FIXED] Few define snags
Change-Id: I0d04c3834e464eca84a5a715743a297a0cefd0af
In short, the display fading back in after a pause resuming interferes
with the audio codec, causing BadThings(tm) that cannot be recovered from
This really is just avoiding a known trigger; there's no guarantee this
condition won't occur under random circumstances during normal use,
and there's no good way to work around this from within rockbox.
I suspect the underlying problem is that both the display control and
codec control share an i2c bus, but the kernel drivers implementing them
isn't using proper linux bus access/locking.
Change-Id: Id4f56f9cb269ed74aac2f041146b3630cef09030
This also modifies the configuration file to include macros
defined in the H100 / H120 implementation.
Change-Id: Iae845889c98661ec548c04fc57e733dcc346c0f1
REMOVED FROM ALL NATIVE BOOTLOADERS:
finish removing the text scrolling
pare down printf to a minimal subset (%c %s %l %d %u and %x(%p))
remove diacritic and rtl language support
GOAL 134000
START 135305
CURRENT 133700
SUCCESS! (ASSUMING IT WORKS -- UNESTED)
Change-Id: Ic3f6ac1dc260578f581ee53458b3e5bb47d313ec
* Get rid of non-async (ie tick task) mode due to inherent brokenness
* Get rid of nonblock mode; we never write if buffers aren't sufficient
* Move driver init into pcm_open() instead of pcm_init()
* Much better underrun handling
* Better error handling in some situations
* Add in recording functionality
* Use smaller audio buffers to avoid glitching
* Don't start audio buffer with silence
* Allow device name to be overridden by target
Recording portions based on work done by Lorenzo Miori in g#633
Change-Id: I0197bdc1749c28109eb79def1e6a3e1d62d8cef3
at 1 GHZ the intermediate calculation for cycles overflows 32 bits
this makes timer fail even with sensible values
solution divide both sides by 100
Change-Id: I18a4054c2d06fb72531d5496bba562f71b03984f
* Allow output device name to be specified
* Set hw/swparams prior to actual playback start, not at init
* If told to open a new device, cleanly close down old one.
Change-Id: Ib97310ec23588136c031466ee9c22312ab0f9f5a
* Enabled MULTIDRIVE and ROOTFS_HOTPLUG for full hotswap!
(Requires updated bootloader/integration!)
Change-Id: I7dad1f8d375e087c36fce37bec3e9184602ede50
* Cannot turn off the LCD directly (have to rely on backlight)
* Only insmod/rmmod the usb gadget modules if state changes
Change-Id: I9ea90177d496cd035ada93e04a93a7c6f2e84706
Whether or not this is correct depends on how the source material was
mastered, digitized, and/or encoded. There is no setting appropriate
for everything.
Eventually I'd like to make this configurable, but I'd want to have it
shared with more than one target first.
Change-Id: I20a0eff4b3dc2517c33db49d4f72e85bf81d1ca6
* Specify exported USB VID/PID in target config header
* Don't fail if the sd filesystem has already been remounted
(ie due to platform hotplug)
Change-Id: Ifd2dae0c4f15086bf2bf89eb093018b3c4d2b75d
The right thing here probably to just not bother at all, as this
bootloader can't launch rockbox yet anyway.
Change-Id: I62bd22353b6adc9dbe35b94f3b60a6a67348356a
(we were trying to foward-declare functions from within static
initializer context. GCC no longer accepts this)
Change-Id: I58f316ecc84c8ab45fffc054955727a55714b0a3
* Track mute state, only call hw if actual change is needed
* Don't unmute in audiohw_postinit()
* sample rate tracking fixes
* erosq: Don't start up muted
Change-Id: I004f787a4b7ea73c16b6ec9818ec29a12c89f46b
* If AUDIOHW_MUTE_ON_PAUSE, no meaningful change
* Unconditionally unmute on playback start
* xduoox3ii: Mute on sample rate change
* rocker/xduoo: Stay muted after startup
This avoids the nasty "pop" on startup, without doing
the full mute-on-pause stuff that causes unacceptable
dropouts on the X3ii.
Change-Id: I2e3ee0bb8094e288f37a0acada86a80016ce5cac
* HOME_DIR is now either "/" or special "<HOME>"
* target-specific "home dir path" is defined solely by PIVOT_ROOT
* PIVOT_ROOT path is now defined in toplevel config files
* Make Samsung YP-R0/R1 and SONY_NWZ use PIVOT_ROOT too
* Do not prepend PIVOT_ROOT path if the path already has it!
* Do not play these games for __PCTOOL__ builds
Change-Id: I3d51ad902a5f9cafe45ba15ba654f30f1ec6113a
The Q and K have a slightly different case, but the hardware under the
shell is completely identical.
These models are rebadged versions:
* Hifiwalker H2 (== Q)
* AGPTek H3 (== K)
* Surfans F20 (== K)
Other notes:
* Significant improvements in the shared Hiby-platform launcher/loader
* SD card can theoretically be hot-swapped now
* Support external USB mass storage!
* Some consolidation of Hiby-platform targets
* Some consolidation of plugin keymaps
Todo/known issues:
* Keymaps need to be gone over properly
* Convert to HAVE_SCROLLWHEEL?
Change-Id: I5a8a4f22c38a5b69392ca7c0a8ad8c4e07d9523c
Split WM1A/WM1Z because they don't have the same KAS. On newer devices, the KAS
is actually 64 bytes, not 60. The strange thing is that "get_dnk_nvp kas" returns
60 bytes whereas "get_dnk_prop kas" returns 64, not sure why.
Change-Id: I944d3d838209ba58388439af0cdf5d7c74f1f7fc
Most credit goes to: Roman Skylarov
Additional integration and refactoring by myself.
*** COMPLETELY UNTESTED ***
Change-Id: Ia64c36d92e0214c6b15f7a868df286f8113ea27b
This codec requires floating point.
Original author: Peter Sovietov
Ported to Rockbox: Roman Skylarov
Further integration and bugfixes: Solomon Peachy
Change-Id: I781ecd3592dfcdbbc694063334350342534f1d6c
It doesn't work properly and interferes with the power button in the keymap.
Rework WPS keymap a bit to make single-tap power emulate lock.
Change-Id: I9d9b9b4adcea3764e6e427f484e051c9bab9d13b
Basically, existing sizes apply for <= 48KHz audio. Up to 96K,
we double the mix buffer. up to 192K, we double it again.
Will help reduce the interrupt load and overall latency, keeping it
roughtly constant as a function of time, regardless of bitrate.
(It is acutally a fixed-size buffer, statically-allocated to handle the
worst-case bitrate the player supports. However, at runtime if we are
using a lower bitrate we will only use a portion of it in order to keep
latancies down)
Change-Id: I61ca23180a86502732b0903fe9691c1a8c2aeaea
Unsure why this is happening, but now we detect and recover errors at
startup.
Also clean up the mismash of printf(), DEBUGF(), etc in favor of panicf() for the really serious stuff and logf() for everything else.
Change-Id: I9aaa620d55d556645c9a6d108541b987983b32a8
Note: PCM mix buffer sizes are _way_ too small for these high bitrates
(We really need to make the mixer stuff use dynamic buffer sizes based
on the bitrate. Maybe pre-allocate a max size based on upper bitrate limit,
but use only part of it at lower bitrates? So we can have sane latency..)
Change-Id: Id7b4afd73dba7f1ffb84b2e1c016859fae5d6835
* xduoo x3ii/x20: Better line out support
* less granular volume settings (too many steps before)
* Better handling of swiching sample rates
* Log actual sample rate in debug menu
Most credit goes to Roman Stolyarov
Additional integration [re]work by myself
Change-Id: I63af3740678cf2ed3170f61534e1029c81826bb6
* Kill LCD when turning off the backlight
* Fix logic errors in lcd_enable() calls
* Use ioctls instead of sysfs to twiddle lcd enable
Change-Id: I6864ff63d87b747ac48719b0f4ba2de00333a1d3
* SAMPR_CAPS_ALL -> SAMPR_CAPS_ALL_48/96/192
* All targets claiming SAMPR_CAPS_ALL now get appropriate subset
* No need to explicitly define HAVE_PLAY_FREQ
* Rates that are a multiple of 44 or 48KHz can be used for playback
Inspired by a patch by Roman Stolyarov, but substantially rewritten by myself.
Change-Id: Iaca7363521b1cb9921e047ba1004d3cbe9c9c23e
