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/*
* 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 "AudioStreamInSource"
//#define LOG_NDEBUG 0
#include <cutils/compiler.h>
#include <utils/Log.h>
#include <media/nbaio/AudioStreamInSource.h>
namespace android {
AudioStreamInSource::AudioStreamInSource(audio_stream_in *stream) :
NBAIO_Source(),
mStream(stream),
mStreamBufferSizeBytes(0),
mFramesOverrun(0),
mOverruns(0)
{
ALOG_ASSERT(stream != NULL);
}
AudioStreamInSource::~AudioStreamInSource()
{
}
ssize_t AudioStreamInSource::negotiate(const NBAIO_Format offers[], size_t numOffers,
NBAIO_Format counterOffers[], size_t& numCounterOffers)
{
if (mFormat == Format_Invalid) {
mStreamBufferSizeBytes = mStream->common.get_buffer_size(&mStream->common);
audio_format_t streamFormat = mStream->common.get_format(&mStream->common);
if (streamFormat == AUDIO_FORMAT_PCM_16_BIT) {
uint32_t sampleRate = mStream->common.get_sample_rate(&mStream->common);
audio_channel_mask_t channelMask =
(audio_channel_mask_t) mStream->common.get_channels(&mStream->common);
mFormat = Format_from_SR_C(sampleRate, popcount(channelMask));
mBitShift = Format_frameBitShift(mFormat);
}
}
return NBAIO_Source::negotiate(offers, numOffers, counterOffers, numCounterOffers);
}
size_t AudioStreamInSource::framesOverrun()
{
uint32_t framesOverrun = mStream->get_input_frames_lost(mStream);
if (framesOverrun > 0) {
mFramesOverrun += framesOverrun;
// FIXME only increment for contiguous ranges
++mOverruns;
}
return mFramesOverrun;
}
ssize_t AudioStreamInSource::read(void *buffer, size_t count)
{
if (CC_UNLIKELY(mFormat == Format_Invalid)) {
return NEGOTIATE;
}
ssize_t bytesRead = mStream->read(mStream, buffer, count << mBitShift);
if (bytesRead > 0) {
size_t framesRead = bytesRead >> mBitShift;
mFramesRead += framesRead;
return framesRead;
} else {
return bytesRead;
}
}
} // namespace android
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