AMRExtractor::AMRExtractor(const sp<DataSource> &source)
: mDataSource(source),
mInitCheck(NO_INIT),
mOffsetTableLength(0) {
String8 mimeType;
float confidence;
if (!SniffAMR(mDataSource, &mimeType, &confidence, NULL)) {
return;
}
mIsWide = (mimeType == MEDIA_MIMETYPE_AUDIO_AMR_WB);
mMeta = new MetaData;
mMeta->setCString(
kKeyMIMEType, mIsWide ? MEDIA_MIMETYPE_AUDIO_AMR_WB
: MEDIA_MIMETYPE_AUDIO_AMR_NB);
mMeta->setInt32(kKeyChannelCount, 1);
mMeta->setInt32(kKeySampleRate, mIsWide ? 16000 : 8000);
off64_t offset = mIsWide ? 9 : 6;
off64_t streamSize;
size_t frameSize, numFrames = 0;
int64_t duration = 0;
if (mDataSource->getSize(&streamSize) == OK) {
while (offset < streamSize) {
status_t status = getFrameSizeByOffset(source, offset, mIsWide, &frameSize);
if (status == ERROR_END_OF_STREAM) {
break;
} else if (status != OK) {
return;
}
if ((numFrames % 50 == 0) && (numFrames / 50 < OFFSET_TABLE_LEN)) {
CHECK_EQ(mOffsetTableLength, numFrames / 50);
mOffsetTable[mOffsetTableLength] = offset - (mIsWide ? 9: 6);
mOffsetTableLength ++;
}
offset += frameSize;
duration += 20000; // Each frame is 20ms
numFrames ++;
}
mMeta->setInt64(kKeyDuration, duration);
}
mInitCheck = OK;
}
status_t AMRSource::read(
MediaBuffer **out, const ReadOptions *options) {
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode mode;
if (mOffsetTableLength > 0 && options && options->getSeekTo(&seekTimeUs, &mode)) {
size_t size;
int64_t seekFrame = seekTimeUs / 20000ll; // 20ms per frame.
mCurrentTimeUs = seekFrame * 20000ll;
size_t index = seekFrame < 0 ? 0 : seekFrame / 50;
if (index >= mOffsetTableLength) {
index = mOffsetTableLength - 1;
}
mOffset = mOffsetTable[index] + (mIsWide ? 9 : 6);
for (size_t i = 0; i< seekFrame - index * 50; i++) {
status_t err;
if ((err = getFrameSizeByOffset(mDataSource, mOffset,
mIsWide, &size)) != OK) {
return err;
}
mOffset += size;
}
}
uint8_t header;
ssize_t n = mDataSource->readAt(mOffset, &header, 1);
if (n < 1) {
return ERROR_END_OF_STREAM;
}
if (header & 0x83) {
// Padding bits must be 0.
ALOGE("padding bits must be 0, header is 0x%02x", header);
return ERROR_MALFORMED;
}
unsigned FT = (header >> 3) & 0x0f;
size_t frameSize = getFrameSize(mIsWide, FT);
if (frameSize == 0) {
return ERROR_MALFORMED;
}
MediaBuffer *buffer;
status_t err = mGroup->acquire_buffer(&buffer);
if (err != OK) {
return err;
}
n = mDataSource->readAt(mOffset, buffer->data(), frameSize);
if (n != (ssize_t)frameSize) {
buffer->release();
buffer = NULL;
if (n < 0) {
return ERROR_IO;
} else {
// only partial frame is available, treat it as EOS.
mOffset += n;
return ERROR_END_OF_STREAM;
}
}
buffer->set_range(0, frameSize);
buffer->meta_data()->setInt64(kKeyTime, mCurrentTimeUs);
buffer->meta_data()->setInt32(kKeyIsSyncFrame, 1);
mOffset += frameSize;
mCurrentTimeUs += 20000; // Each frame is 20ms
*out = buffer;
return OK;
}
status_t AMRSource::read(
MediaBuffer **out, const ReadOptions *options) {
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode mode;
if (options && options->getSeekTo(&seekTimeUs, &mode)) {
#ifdef MTK_AOSP_ENHANCEMENT
// Maybe risk (int)index >= (uint)mOffsetTableLength warning: comparison between signed and unsigned integer expressions
// should check seekTimeUs < 0 case
if (seekTimeUs < 0) {
ALOGW("seekTimeUs:%lld < 0", seekTimeUs);
seekTimeUs = 0;
}
#endif
size_t size;
int64_t seekFrame = seekTimeUs / 20000ll; // 20ms per frame.
mCurrentTimeUs = seekFrame * 20000ll;
size_t index = seekFrame < 0 ? 0 : seekFrame / 50;
if (index >= mOffsetTableLength) {
index = mOffsetTableLength - 1;
}
mOffset = mOffsetTable[index] + (mIsWide ? 9 : 6);
for (size_t i = 0; i< seekFrame - index * 50; i++) {
status_t err;
if ((err = getFrameSizeByOffset(mDataSource, mOffset,
mIsWide, &size)) != OK) {
return err;
}
mOffset += size;
}
}
uint8_t header;
ssize_t n = mDataSource->readAt(mOffset, &header, 1);
if (n < 1) {
return ERROR_END_OF_STREAM;
}
#ifdef MTK_AOSP_ENHANCEMENT
int count = 0;
while(header & 0x83)
{
if ((count % 10) == 0)
SXLOGW("AMRSource::read--Frame head error,skip until to find an valid one count %d",count);
mOffset++;
count++;
if (count>320) {
SXLOGW("getFrameSizeByOffset--can not find the correct frame header in 64 byte");
return ERROR_END_OF_STREAM;
}
n = mDataSource->readAt(mOffset, &header, 1);
if (n < 1) {
return ERROR_END_OF_STREAM;
}
}
#else
if (header & 0x83) {
// Padding bits must be 0.
ALOGE("padding bits must be 0, header is 0x%02x", header);
return ERROR_MALFORMED;
}
#endif
unsigned FT = (header >> 3) & 0x0f;
size_t frameSize = getFrameSize(mIsWide, FT);
if (frameSize == 0) {
return ERROR_MALFORMED;
}
MediaBuffer *buffer;
status_t err = mGroup->acquire_buffer(&buffer);
if (err != OK) {
return err;
}
n = mDataSource->readAt(mOffset, buffer->data(), frameSize);
if (n != (ssize_t)frameSize) {
buffer->release();
buffer = NULL;
return ERROR_IO;
}
buffer->set_range(0, frameSize);
buffer->meta_data()->setInt64(kKeyTime, mCurrentTimeUs);
buffer->meta_data()->setInt32(kKeyIsSyncFrame, 1);
mOffset += frameSize;
mCurrentTimeUs += 20000; // Each frame is 20ms
*out = buffer;
return OK;
}
AMRExtractor::AMRExtractor(const sp<DataSource> &source)
: mDataSource(source),
mInitCheck(NO_INIT),
mOffsetTableLength(0) {
String8 mimeType;
float confidence;
if (!SniffAMR(mDataSource, &mimeType, &confidence, NULL)) {
return;
}
mIsWide = (mimeType == MEDIA_MIMETYPE_AUDIO_AMR_WB);
mMeta = new MetaData;
mMeta->setCString(
kKeyMIMEType, mIsWide ? MEDIA_MIMETYPE_AUDIO_AMR_WB
: MEDIA_MIMETYPE_AUDIO_AMR_NB);
mMeta->setInt32(kKeyChannelCount, 1);
mMeta->setInt32(kKeySampleRate, mIsWide ? 16000 : 8000);
off64_t offset = mIsWide ? 9 : 6;
off64_t streamSize;
size_t frameSize, numFrames = 0;
int64_t duration = 0;
#ifdef MTK_AOSP_ENHANCEMENT
status_t ret = 0;
bool streamingFlag = mDataSource->flags() & DataSource::kIsCachingDataSource;
char *pData = new char [Buffer_Count_Readed];
ssize_t dataLen = 0;
size_t dataOffset = 0;
SXLOGD("AMRExtractor--is streaming flag=%d, pData:0x%x", streamingFlag, pData);
#endif
if (mDataSource->getSize(&streamSize) == OK) {
while (offset < streamSize) {
#ifdef MTK_AOSP_ENHANCEMENT
if (pData) {
if (dataLen==0) {
dataLen = mDataSource->readAt(offset, (void *)pData, Buffer_Count_Readed);
if (dataLen < 0) {
return;
}
dataOffset = 0;
}
ret = getFrameSizeByOffset_MMIO((uint8_t *)pData, dataLen, dataOffset, offset, mIsWide, &frameSize);
if (ret==NO_MEMORY) {
dataLen = 0;
continue;
}
}else {
ret = getFrameSizeByOffset(source, offset, mIsWide, &frameSize);
}
if (ret==ERROR_END_OF_STREAM) {
break;
}else if(ret!=OK) {
if (pData) delete [] pData;
pData = 0;
SXLOGD("AMRExtractor--getFrameSizeByOffset is not ok!");
return;
}
#else
if (getFrameSizeByOffset(source, offset, mIsWide, &frameSize) != OK) {
return;
}
#endif
if ((numFrames % 50 == 0) && (numFrames / 50 < OFFSET_TABLE_LEN)) {
CHECK_EQ(mOffsetTableLength, numFrames / 50);
mOffsetTable[mOffsetTableLength] = offset - (mIsWide ? 9: 6);
mOffsetTableLength ++;
}
#ifdef MTK_AOSP_ENHANCEMENT
else if(streamingFlag&&(numFrames>=50*OFFSET_TABLE_LEN)) {
duration += 20000*(streamSize - offset)/((offset - (mIsWide ? 9: 6))/(off64_t)numFrames);
SXLOGV("AMRExtractor--end duration=%lld, frame size = %lld", duration, (offset - (mIsWide ? 9: 6))/(off64_t)numFrames);
break;
}
#endif
offset += frameSize;
duration += 20000; // Each frame is 20ms
numFrames ++;
}
mMeta->setInt64(kKeyDuration, duration);
}
#ifdef MTK_AOSP_ENHANCEMENT
if (pData) delete [] pData;
pData = 0;
SXLOGD("AMRExtractor--constructor out -");
#endif
mInitCheck = OK;
}