rockbox/firmware/target/hosted/pcm-alsa.c, branch master

Tweak some PCM drivers for less typecasting with the data pointer.

2012-03-04T13:52:50+00:00

Yeah, sizeof (void) here with GCC is 1. If something has a problem
with that, we'll set it straight.

Change-Id: I9ad3eee75dd440f6404a04a501d1533c8bc18ba9

Revise the PCM callback system after adding multichannel audio.

2012-03-03T06:23:38+00:00

Additional status callback is added to pcm_play/rec_data instead of
using a special function to set it. Status includes DMA error
reporting to the status callback. Playback and recording callback
become more alike except playback uses "const void **addr" (because
the data should not be altered) and recording  uses "void **addr".
"const" is put in place throughout where appropriate.

Most changes are fairly trivial. One that should be checked in
particular because it isn't so much is telechips, if anyone cares to
bother. PP5002 is not so trivial either but that tested as working.

Change-Id: I4928d69b3b3be7fb93e259f81635232df9bd1df2
Reviewed-on: http://gerrit.rockbox.org/166
Reviewed-by: Michael Sevakis 
Tested-by: Michael Sevakis

ypr0: Work around warning introduced by buggy alsa headers.

2012-01-22T19:59:20+00:00

Change-Id: I7c57ad5504db51d2f7563d2f26ff66f8d189b360

hosted/pcm/alsa: Use alternate signal stack for the async callback.

2012-01-21T17:39:19+00:00

Signals are by default executed on the user stack, i.e. the stack of
the currently active thread. This has two problems:
1) The stack size of the current stack is likely insufficient (unless
using sigaltstack threads) because our stack sizes are normally
below MINSIGSTKSIZE which is needed to deliver a signal.
2) Some of our asm code does nasty tricks with the stack pointer. When a
signal comes in during this bad things can happen, e.g. random memory
being overwritten or simply a crash.

Using a well defined stack fixes this. This is comparable with the
separate irq stack on native targets.

ypr0: Cleanup and simplify ascodec functions. Fix audiohw_{pre,post}init() not being called.

2011-12-24T17:59:43+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31423 a1c6a512-1295-4272-9138-f99709370657

Initial commit of the Samsung YP-R0 port.

2011-12-24T11:56:46+00:00

This port is a hybrid native/RaaA port. It runs on a embedded linux system,
but is the only application. It therefore can implement lots of stuff that
native targets also implement, while leveraging the underlying linux kernel.

The port is quite advanced. User interface, audio playback, plugins work
mostly fine. Missing is e.g. power mangement and USB (see SamsungYPR0 wiki page).

Included in utils/ypr0tools are scripts and programs required to generate
a patched firmware. The patched firmware has the rootfs modified to load
Rockbox. It includes a early/safe USB mode.

This port needs a new toolchain, one that includes glibc headers and libraries.
rockboxdev.sh can generate it, but e.g. codesourcey and distro packages may
also work.

Most of the initial effort is done by Lorenzo Miori and others (on ABI),
including reverse engineering and patching of the original firmware,
initial drivers, and more. Big thanks to you.

Flyspray: FS#12348
Author: Lorenzo Miori, myself

Merry christmas to ypr0 owners! :)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31415 a1c6a512-1295-4272-9138-f99709370657