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Due to AudioPullFifo always clearing the |fifo_| before reading
another block from |read_cb_| we can actually remove the AudioFifo
object in favor of a plain AudioBus.
Speedup is ~17% over the old version per AudioConverter benchmark
using --audio-converter-iterations=500000:
Old: 430.04ms
New: 355.44ms
BUG=none
TEST=media_unittests
Review URL: https://chromiumcodereview.appspot.com/15394003
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@201662 0039d316-1c4b-4281-b951-d872f2087c98
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Currently we have roughly equivalent functionality in two places, and
the CloudView project will add a third. As such there's a need for a
single super class which can handle mixing, resampling, and general
conversion from one set of AudioParameters to another.
This change introduces the AudioTransform object which collapses the
key functionality from AudioRendererMixer and OnMoreDataResampler into
a single AudioTransform class which can do everything and is oblivious
to the peculiars of RenderCallback vs AudioSourceCallback.
It also introduces output_frames_ready() methods to the AudioPullFifo
and MultiChannelResampler classes so that buffer delay can be measured
accurately without resorting to input vs output byte counting.
Due to the bulk of AudioRendererMixer's functionality moving into the
new AudioTransform, it made sense to move some decisions into the
AudioRendererMixerInput class as well.
On my Z600, benchmarking 50000 iterations:
Convert() w/ FIFO took 7030.11ms.
Convert() w/o FIFO took 5218.83ms.
BUG=none
TEST=AudioTransform* unittests.
TBR=sergeyu
Review URL: https://chromiumcodereview.appspot.com/11410012
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@168976 0039d316-1c4b-4281-b951-d872f2087c98
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A FIFO (First In First Out) buffer to handle mismatches in buffer sizes
between a provider and consumer. The consumer will pull data from this FIFO.
If data is already available in the FIFO, it is provided to the consumer.
If insufficient data is available to satisfy the request, the FIFO will ask
the provider for more data to fulfill a request.
Patch by henrika@chromium.org:
http://codereview.chromium.org/10915123/
BUG=none
TEST=--gtest_filter=AudioPullFifoTest.*
TBR=henrika
Review URL: https://chromiumcodereview.appspot.com/10914178
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@155744 0039d316-1c4b-4281-b951-d872f2087c98
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