/*
* Copyright (C) 2011 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 USE_LOG SLAndroidLogLevel_Debug
#include "sles_allinclusive.h"
#include "android/include/AacBqToPcmCbRenderer.h"
#include "android/channels.h"
#include <media/stagefright/SimpleDecodingSource.h>
namespace android {
// ADTS header size is 7, but frame size information ends on byte 6 (when counting from byte 1)
#define ADTS_HEADER_SIZE_UP_TO_FRAMESIZE 6
/**
* Returns the size of an AAC ADTS frame.
* Note that if the returned value + offset > size, it means that a partial frame starts at that
* offset, but this function will still return the size of the full frame.
* @param data pointer to the compressed audio data
* @param offset offset in bytes relative to data of where the frame is supposed to start
* @param size the size in bytes of the data block starting at data
* @return the size in bytes of the AAC ADTS frame starting at the given offset of the given
* memory address, 0 if the frame couldn't be parsed.
*/
static size_t getAdtsFrameSize(const uint8_t *data, off64_t offset, size_t size) {
size_t frameSize = 0;
if (!(offset + ADTS_HEADER_SIZE_UP_TO_FRAMESIZE < (off64_t) size)) {
SL_LOGE("AacBqToPcmCbRenderer::getAdtsFrameSize() returns 0 (can't read syncword or header)"
);
return 0;
}
const uint8_t *syncword = data + offset;
if ((syncword[0] != 0xff) || ((syncword[1] & 0xf6) != 0xf0)) {
SL_LOGE("AacBqToPcmCbRenderer::getAdtsFrameSize() returns 0 (wrong syncword)");
return 0;
}
const uint8_t protectionAbsent = data[offset+1] & 0x1;
const uint8_t* header = data + offset + 3;
frameSize = (header[0] & 0x3) << 11 | header[1] << 3 | header[2] >> 5;
// the frame size read already contains the size of the header, so no need to add it here
// protectionAbsent is 0 if there is CRC
static const size_t kAdtsHeaderLengthNoCrc = 7;
static const size_t kAdtsHeaderLengthWithCrc = 9;
size_t headSize = protectionAbsent ? kAdtsHeaderLengthNoCrc : kAdtsHeaderLengthWithCrc;
if (headSize > frameSize) {
SL_LOGE("AacBqToPcmCbRenderer::getAdtsFrameSize() returns 0 (frameSize %zu < headSize %zu)",
frameSize, headSize);
return 0;
}
SL_LOGV("AacBqToPcmCbRenderer::getAdtsFrameSize() returns %u", frameSize);
return frameSize;
}
/**
* Returns whether a block of memory starts and ends on AAC ADTS frame boundaries
* @param data pointer to the compressed audio data
* @param size the size in bytes of the data block to validate
* @return SL_RESULT_SUCCESS if there is AAC ADTS data, and it starts and ends on frame boundaries,
* or an appropriate error code otherwise:
* SL_RESULT_PARAMETER_INVALID if not possible to attempt validation of even one frame
* SL_RESULT_CONTENT_CORRUPTED if the frame contents are otherwise invalid
*/
SLresult AacBqToPcmCbRenderer::validateBufferStartEndOnFrameBoundaries(void* data, size_t size)
{
off64_t offset = 0;
size_t frameSize = 0;
if ((NULL == data) || (size == 0)) {
SL_LOGE("No ADTS to validate");
return SL_RESULT_PARAMETER_INVALID;
}
while (offset < (off64_t) size) {
if ((frameSize = getAdtsFrameSize((uint8_t *)data, offset, size)) == 0) {
SL_LOGE("found ADTS frame of size 0 at offset %lld", (long long) offset);
return SL_RESULT_CONTENT_CORRUPTED;
}
//SL_LOGV("last good offset %llu", offset);
offset += frameSize;
if (offset > (off64_t) size) {
SL_LOGE("found incomplete ADTS frame at end of data");
return SL_RESULT_CONTENT_CORRUPTED;
}
}
if (offset != (off64_t) size) {
SL_LOGE("ADTS parsing error: reached end of incomplete frame");
}
assert(offset == (off64_t) size);
return SL_RESULT_SUCCESS;
}
//--------------------------------------------------------------------------------------------------
AacBqToPcmCbRenderer::AacBqToPcmCbRenderer(const AudioPlayback_Parameters* params,
IAndroidBufferQueue *androidBufferQueue) :
AudioToCbRenderer(params),
mBqSource(new BufferQueueSource(androidBufferQueue))
{
SL_LOGD("AacBqToPcmCbRenderer::AacBqToPcmCbRenderer()");
}
AacBqToPcmCbRenderer::~AacBqToPcmCbRenderer() {
SL_LOGD("AacBqToPcmCbRenderer::~AacBqToPcmCbRenderer()");
}
//--------------------------------------------------
// Event handlers
void AacBqToPcmCbRenderer::onPrepare() {
SL_LOGD("AacBqToPcmCbRenderer::onPrepare()");
Mutex::Autolock _l(mBufferSourceLock);
// Initialize the PCM format info with the known parameters before the start of the decode
{
android::Mutex::Autolock autoLock(mPcmFormatLock);
mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_BITSPERSAMPLE] = SL_PCMSAMPLEFORMAT_FIXED_16;
mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_CONTAINERSIZE] = 16;
//FIXME not true on all platforms
mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_ENDIANNESS] = SL_BYTEORDER_LITTLEENDIAN;
// initialization with the default values: they will be replaced by the actual values
// once the decoder has figured them out
mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_NUMCHANNELS] = UNKNOWN_NUMCHANNELS;
mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_SAMPLERATE] = UNKNOWN_SAMPLERATE;
mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_CHANNELMASK] = SL_ANDROID_UNKNOWN_CHANNELMASK;
}
sp<MediaExtractor> extractor = new AacAdtsExtractor(mBqSource);
// only decoding a single track of data
const size_t kTrackToDecode = 0;
sp<IMediaSource> source = extractor->getTrack(kTrackToDecode);
if (source == 0) {
SL_LOGE("AacBqToPcmCbRenderer::onPrepare: error getting source from extractor");
notifyPrepared(ERROR_UNSUPPORTED);
return;
}
// the audio content is not raw PCM, so we need a decoder
source = SimpleDecodingSource::Create(source);
if (source == NULL) {
SL_LOGE("AacBqToPcmCbRenderer::onPrepare: Could not instantiate decoder.");
notifyPrepared(ERROR_UNSUPPORTED);
return;
}
sp<MetaData> meta = source->getFormat();
SL_LOGD("AacBqToPcmCbRenderer::onPrepare() after instantiating decoder");
if (source->start() != OK) {
SL_LOGE("AacBqToPcmCbRenderer::onPrepare() Failed to start source/decoder.");
notifyPrepared(MEDIA_ERROR_BASE);
return;
}
//---------------------------------
int32_t channelCount;
CHECK(meta->findInt32(kKeyChannelCount, &channelCount));
int32_t sr;
CHECK(meta->findInt32(kKeySampleRate, &sr));
// FIXME similar to AudioSfDecoder::onPrepare()
// already "good to go" (compare to AudioSfDecoder::onPrepare)
mCacheStatus = kStatusHigh;
mCacheFill = 1000;
notifyStatus();
notifyCacheFill();
{
android::Mutex::Autolock autoLock(mPcmFormatLock);
mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_SAMPLERATE] = sr;
mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_NUMCHANNELS] = channelCount;
mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_CHANNELMASK] =
sles_channel_out_mask_from_count(channelCount);
}
SL_LOGV("AacBqToPcmCbRenderer::onPrepare() channel count=%d SR=%d",
channelCount, sr);
//---------------------------------
// The data source, and audio source (a decoder) are ready to be used
mDataSource = mBqSource;
mAudioSource = source;
mAudioSourceStarted = true;
//-------------------------------------
// signal successful completion of prepare
mStateFlags |= kFlagPrepared;
// skipping past AudioToCbRenderer and AudioSfDecoder
GenericPlayer::onPrepare();
SL_LOGD("AacBqToPcmCbRenderer::onPrepare() done, mStateFlags=0x%x", mStateFlags);
}
} // namespace android