bool OmxJpegImageDecoder::decodeSource(sp<MediaSource> decoder,
const sp<MediaSource>& source, SkBitmap* bm) {
status_t rt = decoder->start();
if (rt != OK) {
ALOGE("Cannot start OMX Decoder!");
return false;
}
int64_t startTime = getNowUs();
MediaBuffer *buffer;
// decode source
status_t err = decoder->read(&buffer, NULL);
int64_t duration = getNowUs() - startTime;
if (err != OK) {
CHECK(buffer == NULL);
}
printf("Duration in decoder->read(): %.1f (msecs). \n",
duration / 1E3 );
// Copy pixels from buffer to bm.
// May need to check buffer->rawBytes() == bm->rawBytes().
CHECK_EQ(buffer->size(), bm->getSize());
memcpy(bm->getPixels(), buffer->data(), buffer->size());
buffer->release();
decoder->stop();
return true;
}
status_t TimedTextVOBSUBSource::read(
int64_t *startTimeUs, int64_t *endTimeUs, Parcel *parcel,
const MediaSource::ReadOptions *options)
{
MediaBuffer *textBuffer = NULL;
uint32_t type;
const int *paletteData;
size_t paletteDataSize = 0;
status_t err = mSource->read(&textBuffer, options);
if (err != OK)
{
ALOGE("mSource->read() failed, error code %d\n", err);
return err;
}
CHECK(textBuffer != NULL);
textBuffer->meta_data()->findInt64(kKeyTime, startTimeUs);
char * content = (char *)textBuffer->data();
size_t size = textBuffer->size();
CHECK_GE(*startTimeUs, 0);
mSubParser->stInit(content, size);
do
{
err = mSubParser->stParseControlPacket();
if (err != OK)
break;
if (mSubParser->m_iDataPacketSize <= 4)
break;
if (err != OK)
break;
err = mSubParser->stParseDataPacket(NULL, 0);
if (err != OK)
break;
//*startTimeUs = (int64_t)(mSubParser->m_iBeginTime);
ALOGE("Call extractAndAppendLocalDescriptions, send data to \n");
extractAndAppendLocalDescriptions(*startTimeUs, textBuffer, parcel);
}
while (false);
textBuffer->release();
*endTimeUs = -1;
mSubParser->incTmpFileIdx();
ALOGE("read() finished\n");
return OK;
}
int OMXInterface::EncodeDecodeAudio(const char *mimeType, void *sourceData, size_t sourceSize, int32_t srcChannelCount, int32_t srcSampleRate, void **destData, size_t *destSize, bool encode)
{
sp<MetaData> meta, outFormat;
void *retBuffer = NULL;
int retVal = OK;
meta = new MetaData;
if (meta == NULL)
{
return ENOMEM;
}
meta->setCString(kKeyMIMEType, mimeType);
meta->setInt32(kKeyChannelCount, srcChannelCount);
meta->setInt32(kKeySampleRate, srcSampleRate);
OMXClient *m_Client = new OMXClient;
sp<MediaSource> m_SourceAudio = new MemAudioSource(sourceData, sourceSize, srcChannelCount, srcSampleRate);
sp<MediaSource> m_Decoder = OMXCodec::Create(m_Client->interface(), meta,
encode, m_SourceAudio, NULL);
if (m_Decoder->start() == OK)
{
outFormat = m_Decoder->getFormat();
MediaBuffer *outMediaBuffer = NULL;
if (m_Decoder->read(&outMediaBuffer) == OK)
{
size_t outSize = outMediaBuffer->size();
*destData = (void *)new char[outSize];
memcpy(*destData, outMediaBuffer->data(), outSize);
if (destSize != NULL)
{
*destSize = outSize;
}
}
else
{
retVal = -2;
}
m_Decoder->stop();
}
else
{
retVal = -1;
}
m_Client->disconnect();
return retVal;
}
void createMediaBufferCopy(
const MediaBuffer& sourceBuffer,
int64_t frameTime,
MediaBuffer **newBuffer) {
LOGV("createMediaBufferCopy");
size_t sourceSize = sourceBuffer.size();
void* sourcePointer = sourceBuffer.data();
(*newBuffer) = new MediaBuffer(sourceSize);
memcpy((*newBuffer)->data(), sourcePointer, sourceSize);
(*newBuffer)->meta_data()->setInt64(kKeyTime, frameTime);
}
status_t AMRWBEncoder::read(
MediaBuffer **out, const ReadOptions *options) {
status_t err;
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode mode;
CHECK(options == NULL || !options->getSeekTo(&seekTimeUs, &mode));
bool readFromSource = false;
int64_t wallClockTimeUs = -1;
while (mNumInputSamples < kNumSamplesPerFrame) {
if (mInputBuffer == NULL) {
err = mSource->read(&mInputBuffer, options);
if (err != OK) {
/*m@nufront start*/
if (mInputBuffer != NULL) {
mInputBuffer->release();
mInputBuffer = NULL;
}
mStarted = false;
mFrameEncodingCompletionCondition.signal();
ZJFLOGD("function out for ERROR_END_OF_STREAM");
return ERROR_END_OF_STREAM;
#if 0
if (mNumInputSamples == 0) {
return ERROR_END_OF_STREAM;
}
memset(&mInputFrame[mNumInputSamples],
0,
sizeof(int16_t)
* (kNumSamplesPerFrame - mNumInputSamples));
mNumInputSamples = kNumSamplesPerFrame;
break;
#endif
/*m@nufront end*/
}
size_t align = mInputBuffer->range_length() % sizeof(int16_t);
CHECK_EQ(align, 0);
int64_t timeUs;
if (mInputBuffer->meta_data()->findInt64(kKeyDriftTime, &timeUs)) {
wallClockTimeUs = timeUs;
}
if (mInputBuffer->meta_data()->findInt64(kKeyAnchorTime, &timeUs)) {
mAnchorTimeUs = timeUs;
}
readFromSource = true;
} else {
readFromSource = false;
}
size_t copy =
(kNumSamplesPerFrame - mNumInputSamples) * sizeof(int16_t);
if (copy > mInputBuffer->range_length()) {
copy = mInputBuffer->range_length();
}
memcpy(&mInputFrame[mNumInputSamples],
(const uint8_t *)mInputBuffer->data()
+ mInputBuffer->range_offset(),
copy);
mInputBuffer->set_range(
mInputBuffer->range_offset() + copy,
mInputBuffer->range_length() - copy);
if (mInputBuffer->range_length() == 0) {
mInputBuffer->release();
mInputBuffer = NULL;
}
mNumInputSamples += copy / sizeof(int16_t);
if (mNumInputSamples >= kNumSamplesPerFrame) {
mNumInputSamples %= kNumSamplesPerFrame;
break; // Get a whole input frame 640 bytes
}
}
VO_CODECBUFFER inputData;
memset(&inputData, 0, sizeof(inputData));
inputData.Buffer = (unsigned char*) mInputFrame;
inputData.Length = kInputBufferSize;
CHECK(VO_ERR_NONE == mApiHandle->SetInputData(mEncoderHandle,&inputData));
/*m@nufrnt start*/
//MediaBuffer *buffer;
//CHECK_EQ(mBufferGroup->acquire_buffer(&buffer), OK);
MediaBuffer *buffer;
{
Mutex::Autolock autoLock(mLock);
buffer = new MediaBuffer(1024);
++mNumClientOwnedBuffers;
buffer->setObserver(this);
buffer->add_ref();
}
/*m@nufrnt end*/
uint8_t *outPtr = (uint8_t *)buffer->data();
VO_CODECBUFFER outputData;
memset(&outputData, 0, sizeof(outputData));
VO_AUDIO_OUTPUTINFO outputInfo;
memset(&outputInfo, 0, sizeof(outputInfo));
VO_U32 ret = VO_ERR_NONE;
outputData.Buffer = outPtr;
outputData.Length = buffer->size();
ret = mApiHandle->GetOutputData(mEncoderHandle, &outputData, &outputInfo);
CHECK(ret == VO_ERR_NONE || ret == VO_ERR_INPUT_BUFFER_SMALL);
buffer->set_range(0, outputData.Length);
++mNumFramesOutput;
int64_t mediaTimeUs = mNumFramesOutput * 20000LL;
buffer->meta_data()->setInt64(kKeyTime, mAnchorTimeUs + mediaTimeUs);
if (readFromSource && wallClockTimeUs != -1) {
buffer->meta_data()->setInt64(kKeyDriftTime, mediaTimeUs - wallClockTimeUs);
}
*out = buffer;
return OK;
}
status_t MP3Source::read(
MediaBuffer **out, const ReadOptions *options) {
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode mode;
bool seekCBR = false;
if (options != NULL && options->getSeekTo(&seekTimeUs, &mode)) {
int64_t actualSeekTimeUs = seekTimeUs;
#ifndef ANDROID_DEFAULT_CODE
if(!mEnableTOC){
#endif
if (mSeeker == NULL
|| !mSeeker->getOffsetForTime(&actualSeekTimeUs, &mCurrentPos)) {
int32_t bitrate;
if (!mMeta->findInt32(kKeyBitRate, &bitrate)) {
// bitrate is in bits/sec.
ALOGI("no bitrate");
return ERROR_UNSUPPORTED;
}
mCurrentTimeUs = seekTimeUs;
mCurrentPos = mFirstFramePos + seekTimeUs * bitrate / 8000000;
seekCBR = true;
} else {
mCurrentTimeUs = actualSeekTimeUs;
}
#ifndef ANDROID_DEFAULT_CODE
}else{
MP3_EXTR_DBG("before getFramePos seekTimeUs=%lld",seekTimeUs);
off_t ActualPos=0;
status_t stat=getFramePos(seekTimeUs, &mCurrentTimeUs, &ActualPos, true);
if(stat==BAD_VALUE){
int32_t bitrate;
if (!mMeta->findInt32(kKeyBitRate, &bitrate)) {
// bitrate is in bits/sec.
MP3_EXTR_WARN("no bitrate");
return ERROR_UNSUPPORTED;
}
mCurrentTimeUs = seekTimeUs;
mCurrentPos = mFirstFramePos + seekTimeUs * bitrate / 8000000;
if (mSeeker == NULL || !mSeeker->getOffsetForTime(&actualSeekTimeUs, &mCurrentPos)) {
int32_t bitrate;
if (!mMeta->findInt32(kKeyBitRate, &bitrate)) {
// bitrate is in bits/sec.
ALOGI("no bitrate");
return ERROR_UNSUPPORTED;
}
mCurrentTimeUs = seekTimeUs;
mCurrentPos = mFirstFramePos + seekTimeUs * bitrate / 8000000;
seekCBR = true;
} else {
mCurrentTimeUs = actualSeekTimeUs;
}
}else if(stat == ERROR_END_OF_STREAM){
return stat;
}else{
mCurrentPos= ActualPos;
MP3_EXTR_DBG("after seek mCurrentTimeUs=%lld,pActualPos=%ld",mCurrentTimeUs,ActualPos);
}
}
#endif
mBasisTimeUs = mCurrentTimeUs;
mSamplesRead = 0;
}
MediaBuffer *buffer;
status_t err = mGroup->acquire_buffer(&buffer);
if (err != OK) {
return err;
}
size_t frame_size;
int bitrate;
int num_samples;
int sample_rate;
for (;;) {
ssize_t n = mDataSource->readAt(mCurrentPos, buffer->data(), 4);
if (n < 4) {
buffer->release();
buffer = NULL;
return ERROR_END_OF_STREAM;
}
uint32_t header = U32_AT((const uint8_t *)buffer->data());
if ((header & kMask) == (mFixedHeader & kMask)
&& GetMPEGAudioFrameSize(
header, &frame_size, &sample_rate, NULL,
&bitrate, &num_samples)) {
// re-calculate mCurrentTimeUs because we might have called Resync()
if (seekCBR) {
mCurrentTimeUs = (mCurrentPos - mFirstFramePos) * 8000 / bitrate;
mBasisTimeUs = mCurrentTimeUs;
}
break;
}
// Lost sync.
ALOGV("lost sync! header = 0x%08x, old header = 0x%08x\n", header, mFixedHeader);
off64_t pos = mCurrentPos;
if (!Resync(mDataSource, mFixedHeader, &pos, NULL, NULL)) {
ALOGE("Unable to resync. Signalling end of stream.");
buffer->release();
buffer = NULL;
return ERROR_END_OF_STREAM;
}
mCurrentPos = pos;
// Try again with the new position.
}
CHECK(frame_size <= buffer->size());
ssize_t n = mDataSource->readAt(mCurrentPos, buffer->data(), frame_size);
if (n < (ssize_t)frame_size) {
buffer->release();
buffer = NULL;
return ERROR_END_OF_STREAM;
}
buffer->set_range(0, frame_size);
buffer->meta_data()->setInt64(kKeyTime, mCurrentTimeUs);
buffer->meta_data()->setInt32(kKeyIsSyncFrame, 1);
mCurrentPos += frame_size;
mSamplesRead += num_samples;
mCurrentTimeUs = mBasisTimeUs + ((mSamplesRead * 1000000) / sample_rate);
*out = buffer;
return OK;
}
status_t APESource::read(
MediaBuffer **out, const ReadOptions *options)
{
*out = NULL;
uint32_t newframe = 0 , firstbyte = 0;
///LOGV("APESource::read");
int64_t seekTimeUs;
ReadOptions::SeekMode mode;
int32_t bitrate = 0;
if (!mMeta->findInt32(kKeyBitRate, &bitrate)
|| !mMeta->findInt32(kKeySampleRate, &mSampleRate))
{
LOGI("no bitrate");
return ERROR_UNSUPPORTED;
}
if (options != NULL && options->getSeekTo(&seekTimeUs, &mode))
{
{
int64_t duration = 0;
int64_t seektabletime = 0;
if ((mTotalsample > 0) && (mTableOfContents[0] > 0) && (mSamplesPerFrame > 0)
&& mMeta->findInt64(kKeyDuration, &duration))
{
ape_parser_ctx_t ape_ctx;
uint32_t filepos, blocks_to_skip;
ape_ctx.samplerate = mSampleRate;
ape_ctx.blocksperframe = mSamplesPerFrame;
ape_ctx.totalframes = mTotalFrame;
ape_ctx.seektable = mTableOfContents;
ape_ctx.firstframe = mTableOfContents[0];
if (ape_calc_seekpos_by_microsecond(&ape_ctx,
seekTimeUs,
&newframe,
&filepos,
&firstbyte,
&blocks_to_skip) < 0)
{
LOGD("getseekto error exit");
return ERROR_UNSUPPORTED;
}
mCurrentPos = filepos;
mCurrentTimeUs = (int64_t)newframe * mSamplesPerFrame * 1000000ll / mSampleRate;
LOGD("getseekto seekTimeUs=%lld, Actual time%lld, filepos%x,frame %d, seekbyte %d", seekTimeUs, mCurrentTimeUs, mCurrentPos, newframe, firstbyte);
}
else
{
LOGD("getseekto parameter error exit");
return ERROR_UNSUPPORTED;
}
}
}
if ((mFileoffset != 0)
&& (mCurrentPos >= mFileoffset))
{
LOGD("APESource::readAt to end filesize %x curr: %x", mFileoffset, mCurrentPos);
return ERROR_END_OF_STREAM;
}
MediaBuffer *buffer;
status_t err = mGroup->acquire_buffer(&buffer);
if (err != OK)
{
LOGD("APESource::acquire_buffer fail");
return err;
}
size_t frame_size;
frame_size = kMaxFrameSize;
ssize_t n = 0;
#ifdef ENABLE_MMRIOTHREAD
if (options != NULL && options->getSeekTo(&seekTimeUs, &mode))
{
ResetReadioPtr(mCurrentPos);
}
n = ReadBitsteam(buffer->data(), frame_size);
#else
///frame_size = mMaxBufferSize;
n = mDataSource->readAt(mCurrentPos, buffer->data(), frame_size);
#endif
///LOGE("APESource::readAt %x, %x, %d, %d, %d, %d, %d", mCurrentPos, buffer->data(), buffer->size(), mTotalsample, bitrate, mSampleRate, frame_size);
//ssize_t n = mDataSource->readAt(mCurrentPos, buffer->data(), frame_size);
if ((mFileoffset != 0)
&& ((mCurrentPos + n) >= mFileoffset))
{
frame_size = mFileoffset - mCurrentPos;
memset(buffer->data() + frame_size, 0, n - frame_size);
}
else if ((n < (ssize_t)frame_size)
&& (n > 0))
{
frame_size = n;
off64_t fileoffset = 0;
mDataSource->getSize(&fileoffset);
LOGD("APESource::readAt not enough read %d frmsize %x, filepos %x, filesize %x", n, frame_size, mCurrentPos + frame_size, fileoffset);
//if ((mCurrentPos + frame_size) >= fileoffset
// && (mCurrentPos + frame_size) < mTableOfContents[mTotalFrame - 1])
if ((mCurrentPos + frame_size) >= fileoffset && (mCurrentPos + frame_size) < mTableOfContents[mSt_bound- 1])
{
memset(buffer->data(), 0, buffer->size());
/// for this file is not complete error, frame buffer should not transfer to avoid decoding noise data.
LOGD("APESource::file is not enough to end --> memset");
}
}
else if (n <= 0)
{
buffer->release();
buffer = NULL;
LOGD("APESource::readAt EOS filepos %x frmsize %d", mCurrentPos, frame_size);
return ERROR_END_OF_STREAM;
}
buffer->set_range(0, frame_size);
if (options != NULL && options->getSeekTo(&seekTimeUs, &mode))
{
buffer->meta_data()->setInt64(kKeyTime, mCurrentTimeUs);
buffer->meta_data()->setInt32(kKeyNemFrame, newframe);
buffer->meta_data()->setInt32(kKeySeekByte, firstbyte);
}
buffer->meta_data()->setInt32(kKeyIsSyncFrame, 1);
mCurrentPos += frame_size;
mCurrentTimeUs += (int64_t)(frame_size * 8000000ll) / bitrate ;
#ifdef ENABLE_MMRIOTHREAD
UpdateReadPtr(frame_size);
#endif
*out = buffer;
///LOGE("APESource::kKeyTime done %x %lld", mCurrentPos, mCurrentTimeUs);
return OK;
}
bool OmxDecoder::ReadVideo(VideoFrame *aFrame, int64_t aSeekTimeUs)
{
if (!mVideoSource.get())
return false;
ReleaseVideoBuffer();
status_t err;
if (aSeekTimeUs != -1) {
MediaSource::ReadOptions options;
options.setSeekTo(aSeekTimeUs);
err = mVideoSource->read(&mVideoBuffer, &options);
} else {
err = mVideoSource->read(&mVideoBuffer);
}
if (err == OK && mVideoBuffer->range_length() > 0) {
int64_t timeUs;
int32_t unreadable;
int32_t keyFrame;
if (!mVideoBuffer->meta_data()->findInt64(kKeyTime, &timeUs) ) {
LOG("no key time");
return false;
}
if (!mVideoBuffer->meta_data()->findInt32(kKeyIsSyncFrame, &keyFrame)) {
keyFrame = 0;
}
if (!mVideoBuffer->meta_data()->findInt32(kKeyIsUnreadable, &unreadable)) {
unreadable = 0;
}
LOG("data: %p size: %u offset: %u length: %u unreadable: %d",
mVideoBuffer->data(),
mVideoBuffer->size(),
mVideoBuffer->range_offset(),
mVideoBuffer->range_length(),
unreadable);
char *data = reinterpret_cast<char *>(mVideoBuffer->data()) + mVideoBuffer->range_offset();
size_t length = mVideoBuffer->range_length();
if (unreadable) {
LOG("video frame is unreadable");
}
if (!ToVideoFrame(aFrame, timeUs, data, length, keyFrame)) {
return false;
}
}
else if (err == INFO_FORMAT_CHANGED) {
// If the format changed, update our cached info.
return SetVideoFormat();
}
else if (err == ERROR_END_OF_STREAM) {
return false;
}
return true;
}
status_t ShoutcastSource::read(
MediaBuffer **out, const ReadOptions *options) {
CHECK(mStarted);
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode mode;
if (options && options->getSeekTo(&seekTimeUs, &mode)) {
return ERROR_UNSUPPORTED;
}
MediaBuffer *buffer;
status_t err = mGroup->acquire_buffer(&buffer);
if (err != OK) {
return err;
}
*out = buffer;
size_t num_bytes = buffer->size();
if (mMetaDataOffset > 0 && num_bytes > mBytesUntilMetaData) {
num_bytes = mBytesUntilMetaData;
}
ssize_t n = mHttp->receive(buffer->data(), num_bytes);
if (n <= 0) {
return (status_t)n;
}
buffer->set_range(0, n);
mBytesUntilMetaData -= (size_t)n;
if (mBytesUntilMetaData == 0) {
unsigned char num_16_byte_blocks = 0;
n = mHttp->receive((char *)&num_16_byte_blocks, 1);
CHECK_EQ(n, 1);
char meta[255 * 16];
size_t meta_size = num_16_byte_blocks * 16;
size_t meta_length = 0;
while (meta_length < meta_size) {
n = mHttp->receive(&meta[meta_length], meta_size - meta_length);
if (n <= 0) {
return (status_t)n;
}
meta_length += (size_t) n;
}
while (meta_length > 0 && meta[meta_length - 1] == '\0') {
--meta_length;
}
if (meta_length > 0) {
// Technically we should probably attach this meta data to the
// next buffer. XXX
buffer->meta_data()->setData('shou', 'shou', meta, meta_length);
}
mBytesUntilMetaData = mMetaDataOffset;
}
return OK;
}
status_t AMRNBEncoder::read(
MediaBuffer **out, const ReadOptions *options) {
status_t err;
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode mode;
CHECK(options == NULL || !options->getSeekTo(&seekTimeUs, &mode));
bool readFromSource = false;
int64_t wallClockTimeUs = -1;
while (mNumInputSamples < kNumSamplesPerFrame) {
if (mInputBuffer == NULL) {
err = mSource->read(&mInputBuffer, options);
if (err != OK) {
if (mNumInputSamples == 0) {
return ERROR_END_OF_STREAM;
}
memset(&mInputFrame[mNumInputSamples],
0,
sizeof(int16_t)
* (kNumSamplesPerFrame - mNumInputSamples));
mNumInputSamples = kNumSamplesPerFrame;
break;
}
size_t align = mInputBuffer->range_length() % sizeof(int16_t);
CHECK_EQ(align, 0);
readFromSource = true;
int64_t timeUs;
if (mInputBuffer->meta_data()->findInt64(kKeyDriftTime, &timeUs)) {
wallClockTimeUs = timeUs;
}
if (mInputBuffer->meta_data()->findInt64(kKeyAnchorTime, &timeUs)) {
mAnchorTimeUs = timeUs;
}
} else {
readFromSource = false;
}
size_t copy =
(kNumSamplesPerFrame - mNumInputSamples) * sizeof(int16_t);
if (copy > mInputBuffer->range_length()) {
copy = mInputBuffer->range_length();
}
memcpy(&mInputFrame[mNumInputSamples],
(const uint8_t *)mInputBuffer->data()
+ mInputBuffer->range_offset(),
copy);
mNumInputSamples += copy / sizeof(int16_t);
mInputBuffer->set_range(
mInputBuffer->range_offset() + copy,
mInputBuffer->range_length() - copy);
if (mInputBuffer->range_length() == 0) {
mInputBuffer->release();
mInputBuffer = NULL;
}
}
MediaBuffer *buffer;
CHECK_EQ(mBufferGroup->acquire_buffer(&buffer), OK);
uint8_t *outPtr = (uint8_t *)buffer->data();
Frame_Type_3GPP frameType;
int res = AMREncode(
mEncState, mSidState, (Mode)mMode,
mInputFrame, outPtr, &frameType, AMR_TX_WMF);
CHECK(res >= 0);
CHECK((size_t)res < buffer->size());
// Convert header byte from WMF to IETF format.
outPtr[0] = ((outPtr[0] << 3) | 4) & 0x7c;
buffer->set_range(0, res);
// Each frame of 160 samples is 20ms long.
int64_t mediaTimeUs = mNumFramesOutput * 20000LL;
buffer->meta_data()->setInt64(
kKeyTime, mAnchorTimeUs + mediaTimeUs);
if (readFromSource && wallClockTimeUs != -1) {
buffer->meta_data()->setInt64(kKeyDriftTime,
mediaTimeUs - wallClockTimeUs);
}
++mNumFramesOutput;
*out = buffer;
mNumInputSamples = 0;
return OK;
}
status_t MP3Source::read(
MediaBuffer **out, const ReadOptions *options) {
*out = NULL;
int64_t seekTimeUs;
if (options != NULL && options->getSeekTo(&seekTimeUs)) {
int32_t bitrate;
if (!mMeta->findInt32(kKeyBitRate, &bitrate)) {
// bitrate is in kbits/sec.
LOGI("no bitrate");
return ERROR_UNSUPPORTED;
}
mCurrentTimeUs = seekTimeUs;
mCurrentPos = mFirstFramePos + seekTimeUs * bitrate / 1000000 * 125;
}
MediaBuffer *buffer;
status_t err = mGroup->acquire_buffer(&buffer);
if (err != OK) {
return err;
}
size_t frame_size;
for (;;) {
ssize_t n = mDataSource->read_at(mCurrentPos, buffer->data(), 4);
if (n < 4) {
buffer->release();
buffer = NULL;
return ERROR_END_OF_STREAM;
}
uint32_t header = U32_AT((const uint8_t *)buffer->data());
if (get_mp3_frame_size(header, &frame_size)) {
break;
}
// Lost sync.
LOGW("lost sync!\n");
off_t pos = mCurrentPos;
if (!Resync(mDataSource, mFixedHeader, &pos, NULL)) {
LOGE("Unable to resync. Signalling end of stream.");
buffer->release();
buffer = NULL;
return ERROR_END_OF_STREAM;
}
mCurrentPos = pos;
// Try again with the new position.
}
CHECK(frame_size <= buffer->size());
ssize_t n = mDataSource->read_at(mCurrentPos, buffer->data(), frame_size);
if (n < (ssize_t)frame_size) {
buffer->release();
buffer = NULL;
return ERROR_END_OF_STREAM;
}
buffer->set_range(0, frame_size);
buffer->meta_data()->setInt32(kKeyTimeUnits, mCurrentTimeUs / 1000);
buffer->meta_data()->setInt32(kKeyTimeScale, 1000);
mCurrentPos += frame_size;
mCurrentTimeUs += 1152 * 1000000 / 44100;
*out = buffer;
return OK;
}