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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 "NBAIO"
//#define LOG_NDEBUG 0
#include <utils/Log.h>
#include <media/nbaio/NBAIO.h>
namespace android {
size_t Format_frameSize(const NBAIO_Format& format)
{
return format.mFrameSize;
}
const NBAIO_Format Format_Invalid = { 0, 0, AUDIO_FORMAT_INVALID, 0 };
unsigned Format_sampleRate(const NBAIO_Format& format)
{
if (!Format_isValid(format)) {
return 0;
}
return format.mSampleRate;
}
unsigned Format_channelCount(const NBAIO_Format& format)
{
if (!Format_isValid(format)) {
return 0;
}
return format.mChannelCount;
}
NBAIO_Format Format_from_SR_C(unsigned sampleRate, unsigned channelCount,
audio_format_t format)
{
if (sampleRate == 0 || channelCount == 0 || !audio_is_valid_format(format)) {
return Format_Invalid;
}
NBAIO_Format ret;
ret.mSampleRate = sampleRate;
ret.mChannelCount = channelCount;
ret.mFormat = format;
ret.mFrameSize = audio_is_linear_pcm(format) ?
channelCount * audio_bytes_per_sample(format) : sizeof(uint8_t);
return ret;
}
// This is a default implementation; it is expected that subclasses will optimize this.
ssize_t NBAIO_Sink::writeVia(writeVia_t via, size_t total, void *user, size_t block)
{
if (!mNegotiated) {
return (ssize_t) NEGOTIATE;
}
static const size_t maxBlock = 32;
size_t frameSize = Format_frameSize(mFormat);
ALOG_ASSERT(frameSize > 0 && frameSize <= 8);
// double guarantees alignment for stack similar to what malloc() gives for heap
if (block == 0 || block > maxBlock) {
block = maxBlock;
}
double buffer[((frameSize * block) + sizeof(double) - 1) / sizeof(double)];
size_t accumulator = 0;
while (accumulator < total) {
size_t count = total - accumulator;
if (count > block) {
count = block;
}
ssize_t ret = via(user, buffer, count);
if (ret > 0) {
ALOG_ASSERT((size_t) ret <= count);
size_t maxRet = ret;
ret = write(buffer, maxRet);
if (ret > 0) {
ALOG_ASSERT((size_t) ret <= maxRet);
accumulator += ret;
continue;
}
}
return accumulator > 0 ? accumulator : ret;
}
return accumulator;
}
// This is a default implementation; it is expected that subclasses will optimize this.
ssize_t NBAIO_Source::readVia(readVia_t via, size_t total, void *user,
int64_t readPTS, size_t block)
{
if (!mNegotiated) {
return (ssize_t) NEGOTIATE;
}
static const size_t maxBlock = 32;
size_t frameSize = Format_frameSize(mFormat);
ALOG_ASSERT(frameSize > 0 && frameSize <= 8);
// double guarantees alignment for stack similar to what malloc() gives for heap
if (block == 0 || block > maxBlock) {
block = maxBlock;
}
double buffer[((frameSize * block) + sizeof(double) - 1) / sizeof(double)];
size_t accumulator = 0;
while (accumulator < total) {
size_t count = total - accumulator;
if (count > block) {
count = block;
}
ssize_t ret = read(buffer, count, readPTS);
if (ret > 0) {
ALOG_ASSERT((size_t) ret <= count);
size_t maxRet = ret;
ret = via(user, buffer, maxRet, readPTS);
if (ret > 0) {
ALOG_ASSERT((size_t) ret <= maxRet);
accumulator += ret;
continue;
}
}
return accumulator > 0 ? accumulator : ret;
}
return accumulator;
}
// Default implementation that only accepts my mFormat
ssize_t NBAIO_Port::negotiate(const NBAIO_Format offers[], size_t numOffers,
NBAIO_Format counterOffers[], size_t& numCounterOffers)
{
ALOGV("negotiate offers=%p numOffers=%u countersOffers=%p numCounterOffers=%u",
offers, numOffers, counterOffers, numCounterOffers);
if (Format_isValid(mFormat)) {
for (size_t i = 0; i < numOffers; ++i) {
if (Format_isEqual(offers[i], mFormat)) {
mNegotiated = true;
return i;
}
}
if (numCounterOffers > 0) {
counterOffers[0] = mFormat;
}
numCounterOffers = 1;
} else {
numCounterOffers = 0;
}
return (ssize_t) NEGOTIATE;
}
bool Format_isValid(const NBAIO_Format& format)
{
return format.mSampleRate != 0 && format.mChannelCount != 0 &&
format.mFormat != AUDIO_FORMAT_INVALID && format.mFrameSize != 0;
}
bool Format_isEqual(const NBAIO_Format& format1, const NBAIO_Format& format2)
{
return format1.mSampleRate == format2.mSampleRate &&
format1.mChannelCount == format2.mChannelCount && format1.mFormat == format2.mFormat &&
format1.mFrameSize == format2.mFrameSize;
}
} // namespace android
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