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android13/frameworks/av/media/extractors/mpeg2/MPEG2TSExtractor.cpp

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/*
* Copyright (C) 2010 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 "MPEG2TSExtractor"
#include <inttypes.h>
#include <utils/Log.h>
#include <android-base/macros.h>
#include "MPEG2TSExtractor.h"
#include <media/IStreamSource.h>
#include <media/stagefright/foundation/ABuffer.h>
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/foundation/ALooper.h>
#include <media/stagefright/foundation/AUtils.h>
#include <media/stagefright/foundation/MediaKeys.h>
#include <media/stagefright/DataSourceBase.h>
#include <media/stagefright/MediaDefs.h>
#include <media/stagefright/MediaErrors.h>
#include <media/stagefright/MetaData.h>
#include <media/stagefright/Utils.h>
#include <mpeg2ts/AnotherPacketSource.h>
#include <utils/String8.h>
#include <hidl/HybridInterface.h>
#include <android/hardware/cas/1.0/ICas.h>
namespace android {
using hardware::cas::V1_0::ICas;
static const size_t kTSPacketSize = 188;
static const int kMaxDurationReadSize = 250000LL;
static const int kMaxDurationRetry = 6;
struct MPEG2TSSource : public MediaTrackHelper {
MPEG2TSSource(
MPEG2TSExtractor *extractor,
const sp<AnotherPacketSource> &impl,
bool doesSeek);
virtual ~MPEG2TSSource();
virtual media_status_t start();
virtual media_status_t stop();
virtual media_status_t getFormat(AMediaFormat *);
virtual media_status_t read(
MediaBufferHelper **buffer, const ReadOptions *options = NULL);
private:
MPEG2TSExtractor *mExtractor;
sp<AnotherPacketSource> mImpl;
// If there are both audio and video streams, only the video stream
// will signal seek on the extractor; otherwise the single stream will seek.
bool mDoesSeek;
DISALLOW_EVIL_CONSTRUCTORS(MPEG2TSSource);
};
MPEG2TSSource::MPEG2TSSource(
MPEG2TSExtractor *extractor,
const sp<AnotherPacketSource> &impl,
bool doesSeek)
: mExtractor(extractor),
mImpl(impl),
mDoesSeek(doesSeek) {
}
MPEG2TSSource::~MPEG2TSSource() {
}
media_status_t MPEG2TSSource::start() {
// initialize with one small buffer, but allow growth
mBufferGroup->init(1 /* one buffer */, 256 /* buffer size */, 64 /* max number of buffers */);
if (!mImpl->start(NULL)) { // AnotherPacketSource::start() doesn't use its argument
return AMEDIA_OK;
}
return AMEDIA_ERROR_UNKNOWN;
}
media_status_t MPEG2TSSource::stop() {
if (!mImpl->stop()) {
return AMEDIA_OK;
}
return AMEDIA_ERROR_UNKNOWN;
}
void copyAMessageToAMediaFormat(AMediaFormat *format, sp<AMessage> msg) {
size_t numEntries = msg->countEntries();
for (size_t i = 0; i < numEntries; i++) {
AMessage::Type type;
const char *name = msg->getEntryNameAt(i, &type);
AMessage::ItemData id = msg->getEntryAt(i);
switch (type) {
case AMessage::kTypeInt32:
int32_t val32;
if (id.find(&val32)) {
AMediaFormat_setInt32(format, name, val32);
}
break;
case AMessage::kTypeInt64:
int64_t val64;
if (id.find(&val64)) {
AMediaFormat_setInt64(format, name, val64);
}
break;
case AMessage::kTypeFloat:
float valfloat;
if (id.find(&valfloat)) {
AMediaFormat_setFloat(format, name, valfloat);
}
break;
case AMessage::kTypeDouble:
double valdouble;
if (id.find(&valdouble)) {
AMediaFormat_setDouble(format, name, valdouble);
}
break;
case AMessage::kTypeString:
if (AString s; id.find(&s)) {
AMediaFormat_setString(format, name, s.c_str());
}
break;
case AMessage::kTypeBuffer:
{
sp<ABuffer> buffer;
if (id.find(&buffer)) {
AMediaFormat_setBuffer(format, name, buffer->data(), buffer->size());
}
break;
}
default:
ALOGW("ignoring unsupported type %d '%s'", type, name);
}
}
}
media_status_t MPEG2TSSource::getFormat(AMediaFormat *meta) {
sp<MetaData> implMeta = mImpl->getFormat();
sp<AMessage> msg;
convertMetaDataToMessage(implMeta, &msg);
copyAMessageToAMediaFormat(meta, msg);
return AMEDIA_OK;
}
media_status_t MPEG2TSSource::read(
MediaBufferHelper **out, const ReadOptions *options) {
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode seekMode;
if (mDoesSeek && options && options->getSeekTo(&seekTimeUs, &seekMode)) {
// seek is needed
status_t err = mExtractor->seek(seekTimeUs, (ReadOptions::SeekMode)seekMode);
if (err == ERROR_END_OF_STREAM) {
return AMEDIA_ERROR_END_OF_STREAM;
} else if (err != OK) {
return AMEDIA_ERROR_UNKNOWN;
}
}
if (mExtractor->feedUntilBufferAvailable(mImpl) != OK) {
return AMEDIA_ERROR_END_OF_STREAM;
}
MediaBufferBase *mbuf;
mImpl->read(&mbuf, (MediaTrack::ReadOptions*) options);
size_t length = mbuf->range_length();
MediaBufferHelper *outbuf;
mBufferGroup->acquire_buffer(&outbuf, false, length);
memcpy(outbuf->data(), mbuf->data(), length);
outbuf->set_range(0, length);
*out = outbuf;
MetaDataBase &inMeta = mbuf->meta_data();
AMediaFormat *outMeta = outbuf->meta_data();
AMediaFormat_clear(outMeta);
int64_t val64;
if (inMeta.findInt64(kKeyTime, &val64)) {
AMediaFormat_setInt64(outMeta, AMEDIAFORMAT_KEY_TIME_US, val64);
}
int32_t val32;
if (inMeta.findInt32(kKeyIsSyncFrame, &val32)) {
AMediaFormat_setInt32(outMeta, AMEDIAFORMAT_KEY_IS_SYNC_FRAME, val32);
}
if (inMeta.findInt32(kKeyCryptoMode, &val32)) {
AMediaFormat_setInt32(outMeta, AMEDIAFORMAT_KEY_CRYPTO_MODE, val32);
}
uint32_t bufType;
const void *bufData;
size_t bufSize;
if (inMeta.findData(kKeyCryptoIV, &bufType, &bufData, &bufSize)) {
AMediaFormat_setBuffer(outMeta, AMEDIAFORMAT_KEY_CRYPTO_IV, bufData, bufSize);
}
if (inMeta.findData(kKeyCryptoKey, &bufType, &bufData, &bufSize)) {
AMediaFormat_setBuffer(outMeta, AMEDIAFORMAT_KEY_CRYPTO_KEY, bufData, bufSize);
}
if (inMeta.findData(kKeyPlainSizes, &bufType, &bufData, &bufSize)) {
AMediaFormat_setBuffer(outMeta, AMEDIAFORMAT_KEY_CRYPTO_PLAIN_SIZES, bufData, bufSize);
}
if (inMeta.findData(kKeyEncryptedSizes, &bufType, &bufData, &bufSize)) {
AMediaFormat_setBuffer(outMeta, AMEDIAFORMAT_KEY_CRYPTO_ENCRYPTED_SIZES, bufData, bufSize);
}
if (inMeta.findData(kKeySEI, &bufType, &bufData, &bufSize)) {
AMediaFormat_setBuffer(outMeta, AMEDIAFORMAT_KEY_SEI, bufData, bufSize);
}
if (inMeta.findData(kKeyAudioPresentationInfo, &bufType, &bufData, &bufSize)) {
AMediaFormat_setBuffer(outMeta, AMEDIAFORMAT_KEY_AUDIO_PRESENTATION_INFO, bufData, bufSize);
}
mbuf->release();
return AMEDIA_OK;
}
////////////////////////////////////////////////////////////////////////////////
MPEG2TSExtractor::MPEG2TSExtractor(DataSourceHelper *source)
: mDataSource(source),
mParser(new ATSParser),
mLastSyncEvent(0),
mOffset(0) {
char header;
if (source->readAt(0, &header, 1) == 1 && header == 0x47) {
mHeaderSkip = 0;
} else {
mHeaderSkip = 4;
}
init();
}
MPEG2TSExtractor::~MPEG2TSExtractor() {
delete mDataSource;
}
size_t MPEG2TSExtractor::countTracks() {
return mSourceImpls.size();
}
MediaTrackHelper *MPEG2TSExtractor::getTrack(size_t index) {
if (index >= mSourceImpls.size()) {
return NULL;
}
// The seek reference track (video if present; audio otherwise) performs
// seek requests, while other tracks ignore requests.
return new MPEG2TSSource(this, mSourceImpls.editItemAt(index),
(mSeekSyncPoints == &mSyncPoints.editItemAt(index)));
}
media_status_t MPEG2TSExtractor::getTrackMetaData(
AMediaFormat *meta,
size_t index, uint32_t /* flags */) {
if (meta == nullptr) {
return AMEDIA_ERROR_INVALID_PARAMETER;
}
sp<MetaData> implMeta = index < mSourceImpls.size()
? mSourceImpls.editItemAt(index)->getFormat() : NULL;
if (implMeta == NULL) {
return AMEDIA_ERROR_UNKNOWN;
}
sp<AMessage> msg = new AMessage;
convertMetaDataToMessage(implMeta, &msg);
copyAMessageToAMediaFormat(meta, msg);
return AMEDIA_OK;
}
media_status_t MPEG2TSExtractor::getMetaData(AMediaFormat *meta) {
AMediaFormat_setString(meta, AMEDIAFORMAT_KEY_MIME, MEDIA_MIMETYPE_CONTAINER_MPEG2TS);
return AMEDIA_OK;
}
//static
bool MPEG2TSExtractor::isScrambledFormat(MetaDataBase &format) {
const char *mime;
return format.findCString(kKeyMIMEType, &mime)
&& (!strcasecmp(MEDIA_MIMETYPE_VIDEO_SCRAMBLED, mime)
|| !strcasecmp(MEDIA_MIMETYPE_AUDIO_SCRAMBLED, mime));
}
media_status_t MPEG2TSExtractor::setMediaCas(const uint8_t* casToken, size_t size) {
HalToken halToken;
halToken.setToExternal((uint8_t*)casToken, size);
sp<ICas> cas = ICas::castFrom(retrieveHalInterface(halToken));
ALOGD("setMediaCas: %p", cas.get());
status_t err = mParser->setMediaCas(cas);
if (err == OK) {
ALOGI("All tracks now have descramblers");
init();
return AMEDIA_OK;
}
return AMEDIA_ERROR_UNKNOWN;
}
status_t MPEG2TSExtractor::findIndexOfSource(const sp<AnotherPacketSource> &impl, size_t *index) {
for (size_t i = 0; i < mSourceImpls.size(); i++) {
if (mSourceImpls[i] == impl) {
*index = i;
return OK;
}
}
return NAME_NOT_FOUND;
}
void MPEG2TSExtractor::addSource(const sp<AnotherPacketSource> &impl) {
size_t index;
if (findIndexOfSource(impl, &index) != OK) {
mSourceImpls.push(impl);
mSyncPoints.push();
}
}
void MPEG2TSExtractor::init() {
bool haveAudio = false;
bool haveVideo = false;
int64_t startTime = ALooper::GetNowUs();
size_t index;
status_t err;
while ((err = feedMore(true /* isInit */)) == OK
|| err == ERROR_DRM_DECRYPT_UNIT_NOT_INITIALIZED) {
if (haveAudio && haveVideo) {
addSyncPoint_l(mLastSyncEvent);
mLastSyncEvent.reset();
break;
}
if (!haveVideo) {
sp<AnotherPacketSource> impl = mParser->getSource(ATSParser::VIDEO);
if (impl != NULL) {
sp<MetaData> format = impl->getFormat();
if (format != NULL) {
haveVideo = true;
addSource(impl);
if (!isScrambledFormat(*(format.get()))) {
if (findIndexOfSource(impl, &index) == OK) {
mSeekSyncPoints = &mSyncPoints.editItemAt(index);
}
}
}
}
}
if (!haveAudio) {
sp<AnotherPacketSource> impl = mParser->getSource(ATSParser::AUDIO);
if (impl != NULL) {
sp<MetaData> format = impl->getFormat();
if (format != NULL) {
haveAudio = true;
addSource(impl);
if (!isScrambledFormat(*(format.get())) && !haveVideo) {
if (findIndexOfSource(impl, &index) == OK) {
mSeekSyncPoints = &mSyncPoints.editItemAt(index);
}
}
}
}
}
addSyncPoint_l(mLastSyncEvent);
mLastSyncEvent.reset();
// ERROR_DRM_DECRYPT_UNIT_NOT_INITIALIZED is returned when the mpeg2ts
// is scrambled but we don't have a MediaCas object set. The extraction
// will only continue when setMediaCas() is called successfully.
if (err == ERROR_DRM_DECRYPT_UNIT_NOT_INITIALIZED) {
ALOGI("stopped parsing scrambled content, "
"haveAudio=%d, haveVideo=%d, elaspedTime=%" PRId64,
haveAudio, haveVideo, ALooper::GetNowUs() - startTime);
return;
}
// Wait only for 2 seconds to detect audio/video streams.
if (ALooper::GetNowUs() - startTime > 2000000LL) {
break;
}
}
off64_t size;
if (mDataSource->getSize(&size) == OK && (haveAudio || haveVideo)) {
size_t prevSyncSize = 1;
int64_t durationUs = -1;
List<int64_t> durations;
// Estimate duration --- stabilize until you get <500ms deviation.
while (feedMore() == OK
&& ALooper::GetNowUs() - startTime <= 2000000LL) {
if (mSeekSyncPoints->size() > prevSyncSize) {
prevSyncSize = mSeekSyncPoints->size();
int64_t diffUs = mSeekSyncPoints->keyAt(prevSyncSize - 1)
- mSeekSyncPoints->keyAt(0);
off64_t diffOffset = mSeekSyncPoints->valueAt(prevSyncSize - 1)
- mSeekSyncPoints->valueAt(0);
int64_t currentDurationUs = size * diffUs / diffOffset;
durations.push_back(currentDurationUs);
if (durations.size() > 5) {
durations.erase(durations.begin());
int64_t min = *durations.begin();
int64_t max = *durations.begin();
for (auto duration : durations) {
if (min > duration) {
min = duration;
}
if (max < duration) {
max = duration;
}
}
if (max - min < 500 * 1000) {
durationUs = currentDurationUs;
break;
}
}
}
}
bool found = false;
for (int i = 0; i < ATSParser::NUM_SOURCE_TYPES; ++i) {
ATSParser::SourceType type = static_cast<ATSParser::SourceType>(i);
sp<AnotherPacketSource> impl = mParser->getSource(type);
if (impl == NULL) {
continue;
}
int64_t trackDurationUs = durationUs;
status_t err;
int64_t bufferedDurationUs = impl->getBufferedDurationUs(&err);
if (err == ERROR_END_OF_STREAM) {
trackDurationUs = bufferedDurationUs;
}
if (trackDurationUs > 0) {
ALOGV("[SourceType%d] durationUs=%" PRId64 "", type, trackDurationUs);
const sp<MetaData> meta = impl->getFormat();
meta->setInt64(kKeyDuration, trackDurationUs);
impl->setFormat(meta);
found = true;
}
}
if (!found) {
estimateDurationsFromTimesUsAtEnd();
}
}
ALOGI("haveAudio=%d, haveVideo=%d, elaspedTime=%" PRId64,
haveAudio, haveVideo, ALooper::GetNowUs() - startTime);
}
status_t MPEG2TSExtractor::feedMore(bool isInit) {
Mutex::Autolock autoLock(mLock);
uint8_t packet[kTSPacketSize];
ssize_t n = mDataSource->readAt(mOffset + mHeaderSkip, packet, kTSPacketSize);
if (n < (ssize_t)kTSPacketSize) {
if (n >= 0) {
mParser->signalEOS(ERROR_END_OF_STREAM);
}
return (n < 0) ? (status_t)n : ERROR_END_OF_STREAM;
}
ATSParser::SyncEvent event(mOffset);
mOffset += mHeaderSkip + n;
status_t err = mParser->feedTSPacket(packet, kTSPacketSize, &event);
if (event.hasReturnedData()) {
if (isInit) {
mLastSyncEvent = event;
} else {
addSyncPoint_l(event);
}
}
return err;
}
void MPEG2TSExtractor::addSyncPoint_l(const ATSParser::SyncEvent &event) {
if (!event.hasReturnedData()) {
return;
}
for (size_t i = 0; i < mSourceImpls.size(); ++i) {
if (mSourceImpls[i].get() == event.getMediaSource().get()) {
KeyedVector<int64_t, off64_t> *syncPoints = &mSyncPoints.editItemAt(i);
syncPoints->add(event.getTimeUs(), event.getOffset());
// We're keeping the size of the sync points at most 5mb per a track.
size_t size = syncPoints->size();
if (size >= 327680) {
int64_t firstTimeUs = syncPoints->keyAt(0);
int64_t lastTimeUs = syncPoints->keyAt(size - 1);
if (event.getTimeUs() - firstTimeUs > lastTimeUs - event.getTimeUs()) {
syncPoints->removeItemsAt(0, 4096);
} else {
syncPoints->removeItemsAt(size - 4096, 4096);
}
}
break;
}
}
}
status_t MPEG2TSExtractor::estimateDurationsFromTimesUsAtEnd() {
if (!(mDataSource->flags() & DataSourceBase::kIsLocalFileSource)) {
return ERROR_UNSUPPORTED;
}
off64_t size = 0;
status_t err = mDataSource->getSize(&size);
if (err != OK) {
return err;
}
uint8_t packet[kTSPacketSize];
const off64_t zero = 0;
off64_t offset = max(zero, size - kMaxDurationReadSize);
if (mDataSource->readAt(offset, &packet, 0) < 0) {
return ERROR_IO;
}
int retry = 0;
bool allDurationsFound = false;
int64_t timeAnchorUs = mParser->getFirstPTSTimeUs();
do {
int bytesRead = 0;
sp<ATSParser> parser = new ATSParser(ATSParser::TS_TIMESTAMPS_ARE_ABSOLUTE);
ATSParser::SyncEvent ev(0);
offset = max(zero, size - (kMaxDurationReadSize << retry));
offset = (offset / kTSPacketSize) * kTSPacketSize;
for (;;) {
if (bytesRead >= kMaxDurationReadSize << max(0, retry - 1)) {
break;
}
ssize_t n = mDataSource->readAt(offset+mHeaderSkip, packet, kTSPacketSize);
if (n < 0) {
return n;
} else if (n < (ssize_t)kTSPacketSize) {
break;
}
offset += kTSPacketSize + mHeaderSkip;
bytesRead += kTSPacketSize + mHeaderSkip;
err = parser->feedTSPacket(packet, kTSPacketSize, &ev);
if (err != OK) {
return err;
}
if (ev.hasReturnedData()) {
int64_t durationUs = ev.getTimeUs();
ATSParser::SourceType type = ev.getType();
ev.reset();
int64_t firstTimeUs;
sp<AnotherPacketSource> src = mParser->getSource(type);
if (src == NULL || src->nextBufferTime(&firstTimeUs) != OK) {
continue;
}
durationUs += src->getEstimatedBufferDurationUs();
durationUs -= timeAnchorUs;
durationUs -= firstTimeUs;
if (durationUs > 0) {
int64_t origDurationUs, lastDurationUs;
const sp<MetaData> meta = src->getFormat();
const uint32_t kKeyLastDuration = 'ldur';
// Require two consecutive duration calculations to be within 1 sec before
// updating; use MetaData to store previous duration estimate in per-stream
// context.
if (!meta->findInt64(kKeyDuration, &origDurationUs)
|| !meta->findInt64(kKeyLastDuration, &lastDurationUs)
|| (origDurationUs < durationUs
&& abs(durationUs - lastDurationUs) < 60000000)) {
meta->setInt64(kKeyDuration, durationUs);
}
meta->setInt64(kKeyLastDuration, durationUs);
}
}
}
if (!allDurationsFound) {
allDurationsFound = true;
for (auto t: {ATSParser::VIDEO, ATSParser::AUDIO}) {
sp<AnotherPacketSource> src = mParser->getSource(t);
if (src == NULL) {
continue;
}
int64_t durationUs;
const sp<MetaData> meta = src->getFormat();
if (!meta->findInt64(kKeyDuration, &durationUs)) {
allDurationsFound = false;
break;
}
}
}
++retry;
} while(!allDurationsFound && offset > 0 && retry <= kMaxDurationRetry);
return allDurationsFound? OK : ERROR_UNSUPPORTED;
}
uint32_t MPEG2TSExtractor::flags() const {
return CAN_PAUSE | CAN_SEEK_BACKWARD | CAN_SEEK_FORWARD;
}
status_t MPEG2TSExtractor::seek(int64_t seekTimeUs,
const MediaTrackHelper::ReadOptions::SeekMode &seekMode) {
if (mSeekSyncPoints == NULL || mSeekSyncPoints->isEmpty()) {
ALOGW("No sync point to seek to.");
// ... and therefore we have nothing useful to do here.
return OK;
}
// Determine whether we're seeking beyond the known area.
bool shouldSeekBeyond =
(seekTimeUs > mSeekSyncPoints->keyAt(mSeekSyncPoints->size() - 1));
// Determine the sync point to seek.
size_t index = 0;
for (; index < mSeekSyncPoints->size(); ++index) {
int64_t timeUs = mSeekSyncPoints->keyAt(index);
if (timeUs > seekTimeUs) {
break;
}
}
switch (seekMode) {
case MediaTrackHelper::ReadOptions::SEEK_NEXT_SYNC:
if (index == mSeekSyncPoints->size()) {
ALOGW("Next sync not found; starting from the latest sync.");
--index;
}
break;
case MediaTrackHelper::ReadOptions::SEEK_CLOSEST_SYNC:
case MediaTrackHelper::ReadOptions::SEEK_CLOSEST:
ALOGW("seekMode not supported: %d; falling back to PREVIOUS_SYNC",
seekMode);
FALLTHROUGH_INTENDED;
case MediaTrackHelper::ReadOptions::SEEK_PREVIOUS_SYNC:
if (index == 0) {
ALOGW("Previous sync not found; starting from the earliest "
"sync.");
} else {
--index;
}
break;
default:
return ERROR_UNSUPPORTED;
}
if (!shouldSeekBeyond || mOffset <= mSeekSyncPoints->valueAt(index)) {
int64_t actualSeekTimeUs = mSeekSyncPoints->keyAt(index);
mOffset = mSeekSyncPoints->valueAt(index);
status_t err = queueDiscontinuityForSeek(actualSeekTimeUs);
if (err != OK) {
return err;
}
}
if (shouldSeekBeyond) {
status_t err = seekBeyond(seekTimeUs);
if (err != OK) {
return err;
}
}
// Fast-forward to sync frame.
for (size_t i = 0; i < mSourceImpls.size(); ++i) {
const sp<AnotherPacketSource> &impl = mSourceImpls[i];
status_t err;
feedUntilBufferAvailable(impl);
while (impl->hasBufferAvailable(&err)) {
sp<AMessage> meta = impl->getMetaAfterLastDequeued(0);
sp<ABuffer> buffer;
if (meta == NULL) {
return UNKNOWN_ERROR;
}
int32_t sync;
if (meta->findInt32("isSync", &sync) && sync) {
break;
}
err = impl->dequeueAccessUnit(&buffer);
if (err != OK) {
return err;
}
feedUntilBufferAvailable(impl);
}
}
return OK;
}
status_t MPEG2TSExtractor::queueDiscontinuityForSeek(int64_t actualSeekTimeUs) {
// Signal discontinuity
sp<AMessage> extra(new AMessage);
extra->setInt64(kATSParserKeyMediaTimeUs, actualSeekTimeUs);
mParser->signalDiscontinuity(ATSParser::DISCONTINUITY_TIME, extra);
// After discontinuity, impl should only have discontinuities
// with the last being what we queued. Dequeue them all here.
for (size_t i = 0; i < mSourceImpls.size(); ++i) {
const sp<AnotherPacketSource> &impl = mSourceImpls.itemAt(i);
sp<ABuffer> buffer;
status_t err;
while (impl->hasBufferAvailable(&err)) {
if (err != OK) {
return err;
}
err = impl->dequeueAccessUnit(&buffer);
// If the source contains anything but discontinuity, that's
// a programming mistake.
CHECK(err == INFO_DISCONTINUITY);
}
}
// Feed until we have a buffer for each source.
for (size_t i = 0; i < mSourceImpls.size(); ++i) {
const sp<AnotherPacketSource> &impl = mSourceImpls.itemAt(i);
sp<ABuffer> buffer;
status_t err = feedUntilBufferAvailable(impl);
if (err != OK) {
return err;
}
}
return OK;
}
status_t MPEG2TSExtractor::seekBeyond(int64_t seekTimeUs) {
// If we're seeking beyond where we know --- read until we reach there.
size_t syncPointsSize = mSeekSyncPoints->size();
while (seekTimeUs > mSeekSyncPoints->keyAt(
mSeekSyncPoints->size() - 1)) {
status_t err;
if (syncPointsSize < mSeekSyncPoints->size()) {
syncPointsSize = mSeekSyncPoints->size();
int64_t syncTimeUs = mSeekSyncPoints->keyAt(syncPointsSize - 1);
// Dequeue buffers before sync point in order to avoid too much
// cache building up.
sp<ABuffer> buffer;
for (size_t i = 0; i < mSourceImpls.size(); ++i) {
const sp<AnotherPacketSource> &impl = mSourceImpls[i];
int64_t timeUs;
while ((err = impl->nextBufferTime(&timeUs)) == OK) {
if (timeUs < syncTimeUs) {
impl->dequeueAccessUnit(&buffer);
} else {
break;
}
}
if (err != OK && err != -EWOULDBLOCK) {
return err;
}
}
}
if (feedMore() != OK) {
return ERROR_END_OF_STREAM;
}
}
return OK;
}
status_t MPEG2TSExtractor::feedUntilBufferAvailable(
const sp<AnotherPacketSource> &impl) {
status_t finalResult;
while (!impl->hasBufferAvailable(&finalResult)) {
if (finalResult != OK) {
return finalResult;
}
status_t err = feedMore();
if (err != OK) {
impl->signalEOS(err);
}
}
return OK;
}
////////////////////////////////////////////////////////////////////////////////
bool SniffMPEG2TS(DataSourceHelper *source, float *confidence) {
for (int i = 0; i < 5; ++i) {
char header;
if (source->readAt(kTSPacketSize * i, &header, 1) != 1
|| header != 0x47) {
// not ts file, check if m2ts file
for (int j = 0; j < 5; ++j) {
char headers[5];
if (source->readAt((kTSPacketSize + 4) * j, &headers, 5) != 5
|| headers[4] != 0x47) {
// not m2ts file too, return
return false;
}
}
ALOGV("this is m2ts file\n");
break;
}
}
*confidence = 0.1f;
return true;
}
} // namespace android
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