You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
389 lines
9.9 KiB
389 lines
9.9 KiB
/*
|
|
* 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 LOG_NDEBUG 0
|
|
#define LOG_TAG "AACExtractor"
|
|
#include <utils/Log.h>
|
|
|
|
#include "include/AACExtractor.h"
|
|
#include "include/avc_utils.h"
|
|
|
|
#include <media/stagefright/foundation/ABuffer.h>
|
|
#include <media/stagefright/foundation/AMessage.h>
|
|
#include <media/stagefright/foundation/ADebug.h>
|
|
#include <media/stagefright/DataSource.h>
|
|
#include <media/stagefright/MediaBufferGroup.h>
|
|
#include <media/stagefright/MediaDefs.h>
|
|
#include <media/stagefright/MediaErrors.h>
|
|
#include <media/stagefright/MediaSource.h>
|
|
#include <media/stagefright/MetaData.h>
|
|
#include <utils/String8.h>
|
|
|
|
namespace android {
|
|
|
|
class AACSource : public MediaSource {
|
|
public:
|
|
AACSource(const sp<DataSource> &source,
|
|
const sp<MetaData> &meta,
|
|
const Vector<uint64_t> &offset_vector,
|
|
int64_t frame_duration_us);
|
|
|
|
virtual status_t start(MetaData *params = NULL);
|
|
virtual status_t stop();
|
|
|
|
virtual sp<MetaData> getFormat();
|
|
|
|
virtual status_t read(
|
|
MediaBuffer **buffer, const ReadOptions *options = NULL);
|
|
|
|
protected:
|
|
virtual ~AACSource();
|
|
|
|
private:
|
|
static const size_t kMaxFrameSize;
|
|
sp<DataSource> mDataSource;
|
|
sp<MetaData> mMeta;
|
|
|
|
off64_t mOffset;
|
|
int64_t mCurrentTimeUs;
|
|
bool mStarted;
|
|
MediaBufferGroup *mGroup;
|
|
|
|
Vector<uint64_t> mOffsetVector;
|
|
int64_t mFrameDurationUs;
|
|
|
|
AACSource(const AACSource &);
|
|
AACSource &operator=(const AACSource &);
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
// Returns the sample rate based on the sampling frequency index
|
|
uint32_t get_sample_rate(const uint8_t sf_index)
|
|
{
|
|
static const uint32_t sample_rates[] =
|
|
{
|
|
96000, 88200, 64000, 48000, 44100, 32000,
|
|
24000, 22050, 16000, 12000, 11025, 8000
|
|
};
|
|
|
|
if (sf_index < sizeof(sample_rates) / sizeof(sample_rates[0])) {
|
|
return sample_rates[sf_index];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Returns the frame length in bytes as described in an ADTS header starting at the given offset,
|
|
// or 0 if the size can't be read due to an error in the header or a read failure.
|
|
// The returned value is the AAC frame size with the ADTS header length (regardless of
|
|
// the presence of the CRC).
|
|
// If headerSize is non-NULL, it will be used to return the size of the header of this ADTS frame.
|
|
static size_t getAdtsFrameLength(const sp<DataSource> &source, off64_t offset, size_t* headerSize) {
|
|
|
|
const size_t kAdtsHeaderLengthNoCrc = 7;
|
|
const size_t kAdtsHeaderLengthWithCrc = 9;
|
|
|
|
size_t frameSize = 0;
|
|
|
|
uint8_t syncword[2];
|
|
if (source->readAt(offset, &syncword, 2) != 2) {
|
|
return 0;
|
|
}
|
|
if ((syncword[0] != 0xff) || ((syncword[1] & 0xf6) != 0xf0)) {
|
|
return 0;
|
|
}
|
|
|
|
uint8_t protectionAbsent;
|
|
if (source->readAt(offset + 1, &protectionAbsent, 1) < 1) {
|
|
return 0;
|
|
}
|
|
protectionAbsent &= 0x1;
|
|
|
|
uint8_t header[3];
|
|
if (source->readAt(offset + 3, &header, 3) < 3) {
|
|
return 0;
|
|
}
|
|
|
|
frameSize = (header[0] & 0x3) << 11 | header[1] << 3 | header[2] >> 5;
|
|
|
|
// protectionAbsent is 0 if there is CRC
|
|
size_t headSize = protectionAbsent ? kAdtsHeaderLengthNoCrc : kAdtsHeaderLengthWithCrc;
|
|
if (headSize > frameSize) {
|
|
return 0;
|
|
}
|
|
if (headerSize != NULL) {
|
|
*headerSize = headSize;
|
|
}
|
|
|
|
return frameSize;
|
|
}
|
|
|
|
AACExtractor::AACExtractor(
|
|
const sp<DataSource> &source, const sp<AMessage> &_meta)
|
|
: mDataSource(source),
|
|
mInitCheck(NO_INIT),
|
|
mFrameDurationUs(0) {
|
|
sp<AMessage> meta = _meta;
|
|
|
|
if (meta == NULL) {
|
|
String8 mimeType;
|
|
float confidence;
|
|
sp<AMessage> _meta;
|
|
|
|
if (!SniffAAC(mDataSource, &mimeType, &confidence, &meta)) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
int64_t offset;
|
|
CHECK(meta->findInt64("offset", &offset));
|
|
|
|
uint8_t profile, sf_index, channel, header[2];
|
|
if (mDataSource->readAt(offset + 2, &header, 2) < 2) {
|
|
return;
|
|
}
|
|
|
|
profile = (header[0] >> 6) & 0x3;
|
|
sf_index = (header[0] >> 2) & 0xf;
|
|
uint32_t sr = get_sample_rate(sf_index);
|
|
if (sr == 0) {
|
|
return;
|
|
}
|
|
channel = (header[0] & 0x1) << 2 | (header[1] >> 6);
|
|
|
|
mMeta = MakeAACCodecSpecificData(profile, sf_index, channel);
|
|
|
|
off64_t streamSize, numFrames = 0;
|
|
size_t frameSize = 0;
|
|
int64_t duration = 0;
|
|
|
|
if (mDataSource->getSize(&streamSize) == OK) {
|
|
while (offset < streamSize) {
|
|
if ((frameSize = getAdtsFrameLength(source, offset, NULL)) == 0) {
|
|
ALOGW("prematured AAC stream (%lld vs %lld)",
|
|
(long long)offset, (long long)streamSize);
|
|
break;
|
|
}
|
|
|
|
mOffsetVector.push(offset);
|
|
|
|
offset += frameSize;
|
|
numFrames ++;
|
|
}
|
|
|
|
// Round up and get the duration
|
|
mFrameDurationUs = (1024 * 1000000ll + (sr - 1)) / sr;
|
|
duration = numFrames * mFrameDurationUs;
|
|
mMeta->setInt64(kKeyDuration, duration);
|
|
}
|
|
|
|
mInitCheck = OK;
|
|
}
|
|
|
|
AACExtractor::~AACExtractor() {
|
|
}
|
|
|
|
sp<MetaData> AACExtractor::getMetaData() {
|
|
sp<MetaData> meta = new MetaData;
|
|
|
|
if (mInitCheck != OK) {
|
|
return meta;
|
|
}
|
|
|
|
meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_AAC_ADTS);
|
|
|
|
return meta;
|
|
}
|
|
|
|
size_t AACExtractor::countTracks() {
|
|
return mInitCheck == OK ? 1 : 0;
|
|
}
|
|
|
|
sp<IMediaSource> AACExtractor::getTrack(size_t index) {
|
|
if (mInitCheck != OK || index != 0) {
|
|
return NULL;
|
|
}
|
|
|
|
return new AACSource(mDataSource, mMeta, mOffsetVector, mFrameDurationUs);
|
|
}
|
|
|
|
sp<MetaData> AACExtractor::getTrackMetaData(size_t index, uint32_t /* flags */) {
|
|
if (mInitCheck != OK || index != 0) {
|
|
return NULL;
|
|
}
|
|
|
|
return mMeta;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
// 8192 = 2^13, 13bit AAC frame size (in bytes)
|
|
const size_t AACSource::kMaxFrameSize = 8192;
|
|
|
|
AACSource::AACSource(
|
|
const sp<DataSource> &source, const sp<MetaData> &meta,
|
|
const Vector<uint64_t> &offset_vector,
|
|
int64_t frame_duration_us)
|
|
: mDataSource(source),
|
|
mMeta(meta),
|
|
mOffset(0),
|
|
mCurrentTimeUs(0),
|
|
mStarted(false),
|
|
mGroup(NULL),
|
|
mOffsetVector(offset_vector),
|
|
mFrameDurationUs(frame_duration_us) {
|
|
}
|
|
|
|
AACSource::~AACSource() {
|
|
if (mStarted) {
|
|
stop();
|
|
}
|
|
}
|
|
|
|
status_t AACSource::start(MetaData * /* params */) {
|
|
CHECK(!mStarted);
|
|
|
|
if (mOffsetVector.empty()) {
|
|
mOffset = 0;
|
|
} else {
|
|
mOffset = mOffsetVector.itemAt(0);
|
|
}
|
|
|
|
mCurrentTimeUs = 0;
|
|
mGroup = new MediaBufferGroup;
|
|
mGroup->add_buffer(new MediaBuffer(kMaxFrameSize));
|
|
mStarted = true;
|
|
|
|
return OK;
|
|
}
|
|
|
|
status_t AACSource::stop() {
|
|
CHECK(mStarted);
|
|
|
|
delete mGroup;
|
|
mGroup = NULL;
|
|
|
|
mStarted = false;
|
|
return OK;
|
|
}
|
|
|
|
sp<MetaData> AACSource::getFormat() {
|
|
return mMeta;
|
|
}
|
|
|
|
status_t AACSource::read(
|
|
MediaBuffer **out, const ReadOptions *options) {
|
|
*out = NULL;
|
|
|
|
int64_t seekTimeUs;
|
|
ReadOptions::SeekMode mode;
|
|
if (options && options->getSeekTo(&seekTimeUs, &mode)) {
|
|
if (mFrameDurationUs > 0) {
|
|
int64_t seekFrame = seekTimeUs / mFrameDurationUs;
|
|
mCurrentTimeUs = seekFrame * mFrameDurationUs;
|
|
|
|
mOffset = mOffsetVector.itemAt(seekFrame);
|
|
}
|
|
}
|
|
|
|
size_t frameSize, frameSizeWithoutHeader, headerSize;
|
|
if ((frameSize = getAdtsFrameLength(mDataSource, mOffset, &headerSize)) == 0) {
|
|
return ERROR_END_OF_STREAM;
|
|
}
|
|
|
|
MediaBuffer *buffer;
|
|
status_t err = mGroup->acquire_buffer(&buffer);
|
|
if (err != OK) {
|
|
return err;
|
|
}
|
|
|
|
frameSizeWithoutHeader = frameSize - headerSize;
|
|
if (mDataSource->readAt(mOffset + headerSize, buffer->data(),
|
|
frameSizeWithoutHeader) != (ssize_t)frameSizeWithoutHeader) {
|
|
buffer->release();
|
|
buffer = NULL;
|
|
|
|
return ERROR_IO;
|
|
}
|
|
|
|
buffer->set_range(0, frameSizeWithoutHeader);
|
|
buffer->meta_data()->setInt64(kKeyTime, mCurrentTimeUs);
|
|
buffer->meta_data()->setInt32(kKeyIsSyncFrame, 1);
|
|
|
|
mOffset += frameSize;
|
|
mCurrentTimeUs += mFrameDurationUs;
|
|
|
|
*out = buffer;
|
|
return OK;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
bool SniffAAC(
|
|
const sp<DataSource> &source, String8 *mimeType, float *confidence,
|
|
sp<AMessage> *meta) {
|
|
off64_t pos = 0;
|
|
|
|
for (;;) {
|
|
uint8_t id3header[10];
|
|
if (source->readAt(pos, id3header, sizeof(id3header))
|
|
< (ssize_t)sizeof(id3header)) {
|
|
return false;
|
|
}
|
|
|
|
if (memcmp("ID3", id3header, 3)) {
|
|
break;
|
|
}
|
|
|
|
// Skip the ID3v2 header.
|
|
|
|
size_t len =
|
|
((id3header[6] & 0x7f) << 21)
|
|
| ((id3header[7] & 0x7f) << 14)
|
|
| ((id3header[8] & 0x7f) << 7)
|
|
| (id3header[9] & 0x7f);
|
|
|
|
len += 10;
|
|
|
|
pos += len;
|
|
|
|
ALOGV("skipped ID3 tag, new starting offset is %lld (0x%016llx)",
|
|
(long long)pos, (long long)pos);
|
|
}
|
|
|
|
uint8_t header[2];
|
|
|
|
if (source->readAt(pos, &header, 2) != 2) {
|
|
return false;
|
|
}
|
|
|
|
// ADTS syncword
|
|
if ((header[0] == 0xff) && ((header[1] & 0xf6) == 0xf0)) {
|
|
*mimeType = MEDIA_MIMETYPE_AUDIO_AAC_ADTS;
|
|
*confidence = 0.2;
|
|
|
|
*meta = new AMessage;
|
|
(*meta)->setInt64("offset", pos);
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
} // namespace android
|