You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
99 lines
2.4 KiB
99 lines
2.4 KiB
/*
|
|
* Copyright (C) 2012 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#define LOG_TAG "PipeReader"
|
|
//#define LOG_NDEBUG 0
|
|
|
|
#include <cutils/compiler.h>
|
|
#include <cutils/atomic.h>
|
|
#include <utils/Log.h>
|
|
#include <media/nbaio/PipeReader.h>
|
|
|
|
namespace android {
|
|
|
|
PipeReader::PipeReader(Pipe& pipe) :
|
|
NBAIO_Source(pipe.mFormat),
|
|
mPipe(pipe), mFifoReader(mPipe.mFifo, false /*throttlesWriter*/, false /*flush*/),
|
|
mFramesOverrun(0),
|
|
mOverruns(0)
|
|
{
|
|
android_atomic_inc(&pipe.mReaders);
|
|
}
|
|
|
|
PipeReader::~PipeReader()
|
|
{
|
|
#if !LOG_NDEBUG
|
|
int32_t readers =
|
|
#else
|
|
(void)
|
|
#endif
|
|
android_atomic_dec(&mPipe.mReaders);
|
|
ALOG_ASSERT(readers > 0);
|
|
}
|
|
|
|
ssize_t PipeReader::availableToRead()
|
|
{
|
|
if (CC_UNLIKELY(!mNegotiated)) {
|
|
return NEGOTIATE;
|
|
}
|
|
size_t lost;
|
|
ssize_t avail = mFifoReader.available(&lost);
|
|
if (avail == -EOVERFLOW || lost > 0) {
|
|
mFramesOverrun += lost;
|
|
++mOverruns;
|
|
avail = OVERRUN;
|
|
}
|
|
return avail;
|
|
}
|
|
|
|
ssize_t PipeReader::read(void *buffer, size_t count)
|
|
{
|
|
size_t lost;
|
|
ssize_t actual = mFifoReader.read(buffer, count, NULL /*timeout*/, &lost);
|
|
ALOG_ASSERT(actual <= count);
|
|
if (actual == -EOVERFLOW || lost > 0) {
|
|
mFramesOverrun += lost;
|
|
++mOverruns;
|
|
actual = OVERRUN;
|
|
}
|
|
if (actual <= 0) {
|
|
return actual;
|
|
}
|
|
mFramesRead += (size_t) actual;
|
|
return actual;
|
|
}
|
|
|
|
ssize_t PipeReader::flush()
|
|
{
|
|
if (CC_UNLIKELY(!mNegotiated)) {
|
|
return NEGOTIATE;
|
|
}
|
|
size_t lost;
|
|
ssize_t flushed = mFifoReader.flush(&lost);
|
|
if (flushed == -EOVERFLOW || lost > 0) {
|
|
mFramesOverrun += lost;
|
|
++mOverruns;
|
|
flushed = OVERRUN;
|
|
}
|
|
if (flushed <= 0) {
|
|
return flushed;
|
|
}
|
|
mFramesRead += (size_t) flushed; // we consider flushed frames as read, but not lost frames
|
|
return flushed;
|
|
}
|
|
|
|
} // namespace android
|