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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(NBAIO_Format format)
{
return Format_channelCount(format) * sizeof(short);
}
size_t Format_frameBitShift(NBAIO_Format format)
{
// sizeof(short) == 2, so frame size == 1 << channels
return Format_channelCount(format);
}
enum {
Format_SR_8000,
Format_SR_11025,
Format_SR_16000,
Format_SR_22050,
Format_SR_24000,
Format_SR_32000,
Format_SR_44100,
Format_SR_48000,
Format_SR_Mask = 7
};
enum {
Format_C_1 = 0x08,
Format_C_2 = 0x10,
Format_C_Mask = 0x18
};
unsigned Format_sampleRate(NBAIO_Format format)
{
if (format == Format_Invalid) {
return 0;
}
switch (format & Format_SR_Mask) {
case Format_SR_8000:
return 8000;
case Format_SR_11025:
return 11025;
case Format_SR_16000:
return 16000;
case Format_SR_22050:
return 22050;
case Format_SR_24000:
return 24000;
case Format_SR_32000:
return 32000;
case Format_SR_44100:
return 44100;
case Format_SR_48000:
return 48000;
default:
return 0;
}
}
unsigned Format_channelCount(NBAIO_Format format)
{
if (format == Format_Invalid) {
return 0;
}
switch (format & Format_C_Mask) {
case Format_C_1:
return 1;
case Format_C_2:
return 2;
default:
return 0;
}
}
NBAIO_Format Format_from_SR_C(unsigned sampleRate, unsigned channelCount)
{
NBAIO_Format format;
switch (sampleRate) {
case 8000:
format = Format_SR_8000;
break;
case 11025:
format = Format_SR_11025;
break;
case 16000:
format = Format_SR_16000;
break;
case 22050:
format = Format_SR_22050;
break;
case 24000:
format = Format_SR_24000;
break;
case 32000:
format = Format_SR_32000;
break;
case 44100:
format = Format_SR_44100;
break;
case 48000:
format = Format_SR_48000;
break;
default:
return Format_Invalid;
}
switch (channelCount) {
case 1:
format |= Format_C_1;
break;
case 2:
format |= Format_C_2;
break;
default:
return Format_Invalid;
}
return format;
}
// 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 (mFormat != Format_Invalid) {
for (size_t i = 0; i < numOffers; ++i) {
if (offers[i] == mFormat) {
mNegotiated = true;
return i;
}
}
if (numCounterOffers > 0) {
counterOffers[0] = mFormat;
}
numCounterOffers = 1;
} else {
numCounterOffers = 0;
}
return (ssize_t) NEGOTIATE;
}
} // namespace android
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