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126 lines
3.9 KiB
126 lines
3.9 KiB
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "SourceAudioBufferProvider"
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//#define LOG_NDEBUG 0
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#include <utils/Log.h>
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#include <media/nbaio/SourceAudioBufferProvider.h>
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namespace android {
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SourceAudioBufferProvider::SourceAudioBufferProvider(const sp<NBAIO_Source>& source) :
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mSource(source),
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// mFrameSize below
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mAllocated(NULL), mSize(0), mOffset(0), mRemaining(0), mGetCount(0), mFramesReleased(0)
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{
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ALOG_ASSERT(source != 0);
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// negotiate with source
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NBAIO_Format counterOffers[1];
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size_t numCounterOffers = 1;
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ssize_t index = source->negotiate(NULL, 0, counterOffers, numCounterOffers);
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ALOG_ASSERT(index == (ssize_t) NEGOTIATE && numCounterOffers > 0);
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numCounterOffers = 0;
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index = source->negotiate(counterOffers, 1, NULL, numCounterOffers);
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ALOG_ASSERT(index == 0);
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mFrameSize = Format_frameSize(source->format());
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}
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SourceAudioBufferProvider::~SourceAudioBufferProvider()
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{
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free(mAllocated);
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}
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status_t SourceAudioBufferProvider::getNextBuffer(Buffer *buffer)
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{
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ALOG_ASSERT(buffer != NULL && buffer->frameCount > 0 && mGetCount == 0);
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// any leftover data available?
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if (mRemaining > 0) {
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ALOG_ASSERT(mOffset + mRemaining <= mSize);
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if (mRemaining < buffer->frameCount) {
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buffer->frameCount = mRemaining;
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}
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buffer->raw = (char *) mAllocated + (mOffset * mFrameSize);
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mGetCount = buffer->frameCount;
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return OK;
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}
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// do we need to reallocate?
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if (buffer->frameCount > mSize) {
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free(mAllocated);
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// Android convention is to _not_ check the return value of malloc and friends.
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// But in this case the calloc() can also fail due to integer overflow,
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// so we check and recover.
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mAllocated = calloc(buffer->frameCount, mFrameSize);
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if (mAllocated == NULL) {
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mSize = 0;
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goto fail;
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}
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mSize = buffer->frameCount;
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}
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{
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// read from source
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ssize_t actual = mSource->read(mAllocated, buffer->frameCount);
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if (actual > 0) {
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ALOG_ASSERT((size_t) actual <= buffer->frameCount);
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mOffset = 0;
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mRemaining = actual;
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buffer->raw = mAllocated;
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buffer->frameCount = actual;
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mGetCount = actual;
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return OK;
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}
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}
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fail:
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buffer->raw = NULL;
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buffer->frameCount = 0;
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mGetCount = 0;
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return NOT_ENOUGH_DATA;
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}
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void SourceAudioBufferProvider::releaseBuffer(Buffer *buffer)
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{
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ALOG_ASSERT((buffer != NULL) &&
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(buffer->raw == (char *) mAllocated + (mOffset * mFrameSize)) &&
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(buffer->frameCount <= mGetCount) &&
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(mGetCount <= mRemaining) &&
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(mOffset + mRemaining <= mSize));
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mOffset += buffer->frameCount;
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mRemaining -= buffer->frameCount;
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mFramesReleased += buffer->frameCount;
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buffer->raw = NULL;
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buffer->frameCount = 0;
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mGetCount = 0;
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}
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size_t SourceAudioBufferProvider::framesReady() const
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{
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ssize_t avail = mSource->availableToRead();
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return avail < 0 ? 0 : (size_t) avail;
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}
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int64_t SourceAudioBufferProvider::framesReleased() const
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{
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return mFramesReleased;
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}
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void SourceAudioBufferProvider::onTimestamp(const ExtendedTimestamp ×tamp)
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{
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mSource->onTimestamp(timestamp);
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}
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} // namespace android
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