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/*
* Copyright (C) 2009 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.
*/
#include "AACDecoder.h"
#include "../../include/ESDS.h"
#include "pvmp4audiodecoder_api.h"
#include <media/stagefright/MediaBufferGroup.h>
#include <media/stagefright/MediaDebug.h>
#include <media/stagefright/MediaDefs.h>
#include <media/stagefright/MetaData.h>
namespace android {
AACDecoder::AACDecoder(const sp<MediaSource> &source)
: mSource(source),
mStarted(false),
mBufferGroup(NULL),
mConfig(new tPVMP4AudioDecoderExternal),
mDecoderBuf(NULL),
mAnchorTimeUs(0),
mNumSamplesOutput(0),
mInputBuffer(NULL) {
}
AACDecoder::~AACDecoder() {
if (mStarted) {
stop();
}
delete mConfig;
mConfig = NULL;
}
status_t AACDecoder::start(MetaData *params) {
CHECK(!mStarted);
mBufferGroup = new MediaBufferGroup;
mBufferGroup->add_buffer(new MediaBuffer(2048 * 2));
mConfig->outputFormat = OUTPUTFORMAT_16PCM_INTERLEAVED;
mConfig->aacPlusUpsamplingFactor = 0;
mConfig->aacPlusEnabled = false;
// The software decoder doesn't properly support mono output on
// AACplus files. Always output stereo.
mConfig->desiredChannels = 2;
UInt32 memRequirements = PVMP4AudioDecoderGetMemRequirements();
mDecoderBuf = malloc(memRequirements);
CHECK_EQ(PVMP4AudioDecoderInitLibrary(mConfig, mDecoderBuf),
MP4AUDEC_SUCCESS);
uint32_t type;
const void *data;
size_t size;
sp<MetaData> meta = mSource->getFormat();
if (meta->findData(kKeyESDS, &type, &data, &size)) {
ESDS esds((const char *)data, size);
CHECK_EQ(esds.InitCheck(), OK);
const void *codec_specific_data;
size_t codec_specific_data_size;
esds.getCodecSpecificInfo(
&codec_specific_data, &codec_specific_data_size);
mConfig->pInputBuffer = (UChar *)codec_specific_data;
mConfig->inputBufferCurrentLength = codec_specific_data_size;
mConfig->inputBufferMaxLength = 0;
mConfig->inputBufferUsedLength = 0;
mConfig->remainderBits = 0;
mConfig->pOutputBuffer = NULL;
mConfig->pOutputBuffer_plus = NULL;
mConfig->repositionFlag = false;
CHECK_EQ(PVMP4AudioDecoderConfig(mConfig, mDecoderBuf),
MP4AUDEC_SUCCESS);
}
mSource->start();
mAnchorTimeUs = 0;
mNumSamplesOutput = 0;
mStarted = true;
return OK;
}
status_t AACDecoder::stop() {
CHECK(mStarted);
if (mInputBuffer) {
mInputBuffer->release();
mInputBuffer = NULL;
}
free(mDecoderBuf);
mDecoderBuf = NULL;
delete mBufferGroup;
mBufferGroup = NULL;
mSource->stop();
mStarted = false;
return OK;
}
sp<MetaData> AACDecoder::getFormat() {
sp<MetaData> srcFormat = mSource->getFormat();
int32_t sampleRate;
CHECK(srcFormat->findInt32(kKeySampleRate, &sampleRate));
sp<MetaData> meta = new MetaData;
meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW);
// We'll always output stereo, regardless of how many channels are
// present in the input due to decoder limitations.
meta->setInt32(kKeyChannelCount, 2);
meta->setInt32(kKeySampleRate, sampleRate);
int64_t durationUs;
if (srcFormat->findInt64(kKeyDuration, &durationUs)) {
meta->setInt64(kKeyDuration, durationUs);
}
return meta;
}
status_t AACDecoder::read(
MediaBuffer **out, const ReadOptions *options) {
status_t err;
*out = NULL;
int64_t seekTimeUs;
if (options && options->getSeekTo(&seekTimeUs)) {
CHECK(seekTimeUs >= 0);
mNumSamplesOutput = 0;
if (mInputBuffer) {
mInputBuffer->release();
mInputBuffer = NULL;
}
} else {
seekTimeUs = -1;
}
if (mInputBuffer == NULL) {
err = mSource->read(&mInputBuffer, options);
if (err != OK) {
return err;
}
int64_t timeUs;
if (mInputBuffer->meta_data()->findInt64(kKeyTime, &timeUs)) {
mAnchorTimeUs = timeUs;
mNumSamplesOutput = 0;
} else {
// We must have a new timestamp after seeking.
CHECK(seekTimeUs < 0);
}
}
MediaBuffer *buffer;
CHECK_EQ(mBufferGroup->acquire_buffer(&buffer), OK);
mConfig->pInputBuffer =
(UChar *)mInputBuffer->data() + mInputBuffer->range_offset();
mConfig->inputBufferCurrentLength = mInputBuffer->range_length();
mConfig->inputBufferMaxLength = 0;
mConfig->inputBufferUsedLength = 0;
mConfig->remainderBits = 0;
mConfig->pOutputBuffer = static_cast<Int16 *>(buffer->data());
mConfig->pOutputBuffer_plus = NULL;
mConfig->repositionFlag = false;
Int decoderErr = PVMP4AudioDecodeFrame(mConfig, mDecoderBuf);
if (decoderErr != MP4AUDEC_SUCCESS) {
LOGE("AAC decoder returned error %d", decoderErr);
buffer->release();
buffer = NULL;
return ERROR_MALFORMED;
}
buffer->set_range(
0, mConfig->frameLength * sizeof(int16_t) * mConfig->desiredChannels);
mInputBuffer->set_range(
mInputBuffer->range_offset() + mConfig->inputBufferUsedLength,
mInputBuffer->range_length() - mConfig->inputBufferUsedLength);
if (mInputBuffer->range_length() == 0) {
mInputBuffer->release();
mInputBuffer = NULL;
}
buffer->meta_data()->setInt64(
kKeyTime,
mAnchorTimeUs
+ (mNumSamplesOutput * 1000000) / mConfig->samplingRate);
mNumSamplesOutput += mConfig->frameLength;
*out = buffer;
return OK;
}
} // namespace android
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