CRAS: audio_thread - Keep list of attached streams per device.

Instead of keeping a list of attached streams in the audio thread
struct, keep a list per device.  This will allow for different streams
to be routed to different or multiple devices in later commits.

Change-Id: I7d3d8437c96f3496375864575c36dab0b7c45c81
Signed-off-by: Dylan Reid <dgreid@chromium.org>
CRAS: mix - Re-order the checks in mix_add_stream.

Re-order the check for mute to be within the while loop.  This will
make mixing streams that require SRC on the server side simpler in a
later change.

Change-Id: I1b2ea5e542cfdec0e562e31cd70bd17276feb745
Signed-off-by: Dylan Reid <dgreid@chromium.org>
CRAS: audio_thread - remove fd from io stream

The fd parameter was just used as a cache.  Remove that and instead
get it from the stream when needed.  This is done so that
cras_io_stream can have per-stream details removed.  Eventually
cras_io_stream will be used for a stream to device mapping, and the
same stream could be held by multiple devices.

BUG=none
TEST=unittest

Change-Id: I9f82d3af07c6f29270d3273105213cd652b1ce10
CRAS: fmt_conv - Move creation from client to fmt_conv.

Move the code that configures the format converter from cras_client
into the format conversion core.  This will allow for the server side
to reuse the same set up code when the SRC is added to it.

BUG=none
TEST=unittests, play two different formats of audio.

Change-Id: Ie0277ae66666ba70ae2c2cea7b067b3378f3da3e
Signed-off-by: Dylan Reid <dgreid@chromium.org>
CRAS: audio_thread - use mix_mute_buffer helper.

Replace meset with cras_mux_mute_buffer.  No functional change.

Change-Id: I288736eb8141295e6ea01b6fb28324d49fc7570d
Signed-off-by: Dylan Reid <dgreid@chromium.org>
CRAS: audio_thread - Factor cras_io_stream to its own file.

Rename cras_io_stream to dev_stream and move it to its own source
file.  In later commits this struct will take on additional
responsibilities keeping sample rate converters and tracking how much
of a stream has been written to each device.

BUG=none
TEST=make check

Change-Id: Ifa19e8f1bb3557ca7c7ff4546ad445729bc3ddfb
Signed-off-by: Dylan Reid <dgreid@chromium.org>
CRAS: move stream mixing to dev_stream.

Move the shm interaction and some decision making to dev_stream as
this is a property of the stream.  cras_mix no longer needs to know
about shm and its unit test is now much cleaner.  This paves the way
to add sample rate conversion logic to dev_stream in a later commit.

BUG=none
TEST=make check, play a few simultaneous streams.

Change-Id: I5fbb3c670e86393a0c8d3454e29c4bf587a5015c
Signed-off-by: Dylan Reid <dgreid@chromium.org>
CRAS: fmt_conv - pass input frmaes as a pointer.

Pass in a pointer to the number of input frames instead of the number.
This allows the number to be updated with the actual amount of frames
that were read.

BUG=none
TEST=make check

Change-Id: Ife3af9262c22e46ca740d40ea229d50c93948864
Signed-off-by: Dylan Reid <dgreid@chromium.org>
CRAS: dev_stream - Add sample rate converter.

Add a sample rate converted to dev stream.  This adds an argument to
the constructor indicating the format of the device the stream will
play on.  If this format doesn't match the stream a sample rate
converter will be created.

A later change will modify audio_thread and rclient to use this
functionality.  For now rclient ensures that the formats match.

BUG=none
TEST=new unittest, the code doesn't run yet.

Change-Id: Id71e593cbed05abc1771e5232c0e181f862053f4
Signed-off-by: Dylan Reid <dgreid@chromium.org>
CRAS: audio_thread - Handle dev_stream with a format converter.

If a dev_stream has a format converter, update the amount of frames
available and use the format converter when rendering samples.

BUG=none
TEST=none, not used yet.

Change-Id: Id1929b1cf8677a57852c4a873c19373bda3303a4
Signed-off-by: Dylan Reid <dgreid@chromium.org>
CRAS: rclient - Accept the remote stream format.

Always accept the remote stream format when a stream is attached.  The
format conversion is now done in the audio thread, allow the client to
send whatever it wants.

This change will cause the client never to do format conversion, and
instead rely on the audio thread to convert to the format of the
device.

BUG=none
TEST=unittest, play record audio on blaze.

Change-Id: Ib6261a640cc237f74e92ee37ce555914d047a43e
Signed-off-by: Dylan Reid <dgreid@chromium.org>