| /* |
| * 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 "MPEG2TSWriter" |
| #include <media/stagefright/foundation/ADebug.h> |
| |
| #include <media/stagefright/foundation/hexdump.h> |
| #include <media/stagefright/foundation/ABuffer.h> |
| #include <media/stagefright/foundation/AMessage.h> |
| #include <media/stagefright/MPEG2TSWriter.h> |
| #include <media/stagefright/MediaBuffer.h> |
| #include <media/stagefright/MediaDefs.h> |
| #include <media/stagefright/MediaErrors.h> |
| #include <media/stagefright/MediaSource.h> |
| #include <media/stagefright/MetaData.h> |
| #include <media/stagefright/Utils.h> |
| #include <arpa/inet.h> |
| |
| #include "include/ESDS.h" |
| |
| namespace android { |
| |
| struct MPEG2TSWriter::SourceInfo : public AHandler { |
| SourceInfo(const sp<MediaSource> &source); |
| |
| void start(const sp<AMessage> ¬ify); |
| void stop(); |
| |
| unsigned streamType() const; |
| unsigned incrementContinuityCounter(); |
| |
| void readMore(); |
| |
| enum { |
| kNotifyStartFailed, |
| kNotifyBuffer, |
| kNotifyReachedEOS, |
| }; |
| |
| sp<ABuffer> lastAccessUnit(); |
| int64_t lastAccessUnitTimeUs(); |
| void setLastAccessUnit(const sp<ABuffer> &accessUnit); |
| |
| void setEOSReceived(); |
| bool eosReceived() const; |
| |
| protected: |
| virtual void onMessageReceived(const sp<AMessage> &msg); |
| |
| virtual ~SourceInfo(); |
| |
| private: |
| enum { |
| kWhatStart = 'strt', |
| kWhatRead = 'read', |
| }; |
| |
| sp<MediaSource> mSource; |
| sp<ALooper> mLooper; |
| sp<AMessage> mNotify; |
| |
| sp<ABuffer> mAACCodecSpecificData; |
| |
| sp<ABuffer> mAACBuffer; |
| |
| sp<ABuffer> mLastAccessUnit; |
| bool mEOSReceived; |
| |
| unsigned mStreamType; |
| unsigned mContinuityCounter; |
| |
| void extractCodecSpecificData(); |
| |
| bool appendAACFrames(MediaBuffer *buffer); |
| bool flushAACFrames(); |
| |
| void postAVCFrame(MediaBuffer *buffer); |
| |
| DISALLOW_EVIL_CONSTRUCTORS(SourceInfo); |
| }; |
| |
| MPEG2TSWriter::SourceInfo::SourceInfo(const sp<MediaSource> &source) |
| : mSource(source), |
| mLooper(new ALooper), |
| mEOSReceived(false), |
| mStreamType(0), |
| mContinuityCounter(0) { |
| mLooper->setName("MPEG2TSWriter source"); |
| |
| sp<MetaData> meta = mSource->getFormat(); |
| const char *mime; |
| CHECK(meta->findCString(kKeyMIMEType, &mime)); |
| |
| if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC)) { |
| mStreamType = 0x0f; |
| } else if (!strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC)) { |
| mStreamType = 0x1b; |
| } else { |
| TRESPASS(); |
| } |
| } |
| |
| MPEG2TSWriter::SourceInfo::~SourceInfo() { |
| } |
| |
| unsigned MPEG2TSWriter::SourceInfo::streamType() const { |
| return mStreamType; |
| } |
| |
| unsigned MPEG2TSWriter::SourceInfo::incrementContinuityCounter() { |
| if (++mContinuityCounter == 16) { |
| mContinuityCounter = 0; |
| } |
| |
| return mContinuityCounter; |
| } |
| |
| void MPEG2TSWriter::SourceInfo::start(const sp<AMessage> ¬ify) { |
| mLooper->registerHandler(this); |
| mLooper->start(); |
| |
| mNotify = notify; |
| |
| (new AMessage(kWhatStart, id()))->post(); |
| } |
| |
| void MPEG2TSWriter::SourceInfo::stop() { |
| mLooper->unregisterHandler(id()); |
| mLooper->stop(); |
| |
| mSource->stop(); |
| } |
| |
| void MPEG2TSWriter::SourceInfo::extractCodecSpecificData() { |
| sp<MetaData> meta = mSource->getFormat(); |
| |
| const char *mime; |
| CHECK(meta->findCString(kKeyMIMEType, &mime)); |
| |
| if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC)) { |
| uint32_t type; |
| const void *data; |
| size_t size; |
| if (!meta->findData(kKeyESDS, &type, &data, &size)) { |
| // Codec specific data better be in the first data buffer. |
| return; |
| } |
| |
| ESDS esds((const char *)data, size); |
| CHECK_EQ(esds.InitCheck(), (status_t)OK); |
| |
| const uint8_t *codec_specific_data; |
| size_t codec_specific_data_size; |
| esds.getCodecSpecificInfo( |
| (const void **)&codec_specific_data, &codec_specific_data_size); |
| |
| CHECK_GE(codec_specific_data_size, 2u); |
| |
| mAACCodecSpecificData = new ABuffer(codec_specific_data_size); |
| |
| memcpy(mAACCodecSpecificData->data(), codec_specific_data, |
| codec_specific_data_size); |
| |
| return; |
| } |
| |
| if (strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC)) { |
| return; |
| } |
| |
| uint32_t type; |
| const void *data; |
| size_t size; |
| if (!meta->findData(kKeyAVCC, &type, &data, &size)) { |
| // Codec specific data better be part of the data stream then. |
| return; |
| } |
| |
| sp<ABuffer> out = new ABuffer(1024); |
| out->setRange(0, 0); |
| |
| const uint8_t *ptr = (const uint8_t *)data; |
| |
| size_t numSeqParameterSets = ptr[5] & 31; |
| |
| ptr += 6; |
| size -= 6; |
| |
| for (size_t i = 0; i < numSeqParameterSets; ++i) { |
| CHECK(size >= 2); |
| size_t length = U16_AT(ptr); |
| |
| ptr += 2; |
| size -= 2; |
| |
| CHECK(size >= length); |
| |
| CHECK_LE(out->size() + 4 + length, out->capacity()); |
| memcpy(out->data() + out->size(), "\x00\x00\x00\x01", 4); |
| memcpy(out->data() + out->size() + 4, ptr, length); |
| out->setRange(0, out->size() + length + 4); |
| |
| ptr += length; |
| size -= length; |
| } |
| |
| CHECK(size >= 1); |
| size_t numPictureParameterSets = *ptr; |
| ++ptr; |
| --size; |
| |
| for (size_t i = 0; i < numPictureParameterSets; ++i) { |
| CHECK(size >= 2); |
| size_t length = U16_AT(ptr); |
| |
| ptr += 2; |
| size -= 2; |
| |
| CHECK(size >= length); |
| |
| CHECK_LE(out->size() + 4 + length, out->capacity()); |
| memcpy(out->data() + out->size(), "\x00\x00\x00\x01", 4); |
| memcpy(out->data() + out->size() + 4, ptr, length); |
| out->setRange(0, out->size() + length + 4); |
| |
| ptr += length; |
| size -= length; |
| } |
| |
| out->meta()->setInt64("timeUs", 0ll); |
| |
| sp<AMessage> notify = mNotify->dup(); |
| notify->setInt32("what", kNotifyBuffer); |
| notify->setBuffer("buffer", out); |
| notify->setInt32("oob", true); |
| notify->post(); |
| } |
| |
| void MPEG2TSWriter::SourceInfo::postAVCFrame(MediaBuffer *buffer) { |
| sp<AMessage> notify = mNotify->dup(); |
| notify->setInt32("what", kNotifyBuffer); |
| |
| sp<ABuffer> copy = |
| new ABuffer(buffer->range_length()); |
| memcpy(copy->data(), |
| (const uint8_t *)buffer->data() |
| + buffer->range_offset(), |
| buffer->range_length()); |
| |
| int64_t timeUs; |
| CHECK(buffer->meta_data()->findInt64(kKeyTime, &timeUs)); |
| copy->meta()->setInt64("timeUs", timeUs); |
| |
| int32_t isSync; |
| if (buffer->meta_data()->findInt32(kKeyIsSyncFrame, &isSync) |
| && isSync != 0) { |
| copy->meta()->setInt32("isSync", true); |
| } |
| |
| notify->setBuffer("buffer", copy); |
| notify->post(); |
| } |
| |
| bool MPEG2TSWriter::SourceInfo::appendAACFrames(MediaBuffer *buffer) { |
| bool accessUnitPosted = false; |
| |
| if (mAACBuffer != NULL |
| && mAACBuffer->size() + 7 + buffer->range_length() |
| > mAACBuffer->capacity()) { |
| accessUnitPosted = flushAACFrames(); |
| } |
| |
| if (mAACBuffer == NULL) { |
| size_t alloc = 4096; |
| if (buffer->range_length() + 7 > alloc) { |
| alloc = 7 + buffer->range_length(); |
| } |
| |
| mAACBuffer = new ABuffer(alloc); |
| |
| int64_t timeUs; |
| CHECK(buffer->meta_data()->findInt64(kKeyTime, &timeUs)); |
| |
| mAACBuffer->meta()->setInt64("timeUs", timeUs); |
| mAACBuffer->meta()->setInt32("isSync", true); |
| |
| mAACBuffer->setRange(0, 0); |
| } |
| |
| const uint8_t *codec_specific_data = mAACCodecSpecificData->data(); |
| |
| unsigned profile = (codec_specific_data[0] >> 3) - 1; |
| |
| unsigned sampling_freq_index = |
| ((codec_specific_data[0] & 7) << 1) |
| | (codec_specific_data[1] >> 7); |
| |
| unsigned channel_configuration = |
| (codec_specific_data[1] >> 3) & 0x0f; |
| |
| uint8_t *ptr = mAACBuffer->data() + mAACBuffer->size(); |
| |
| const uint32_t aac_frame_length = buffer->range_length() + 7; |
| |
| *ptr++ = 0xff; |
| *ptr++ = 0xf1; // b11110001, ID=0, layer=0, protection_absent=1 |
| |
| *ptr++ = |
| profile << 6 |
| | sampling_freq_index << 2 |
| | ((channel_configuration >> 2) & 1); // private_bit=0 |
| |
| // original_copy=0, home=0, copyright_id_bit=0, copyright_id_start=0 |
| *ptr++ = |
| (channel_configuration & 3) << 6 |
| | aac_frame_length >> 11; |
| *ptr++ = (aac_frame_length >> 3) & 0xff; |
| *ptr++ = (aac_frame_length & 7) << 5; |
| |
| // adts_buffer_fullness=0, number_of_raw_data_blocks_in_frame=0 |
| *ptr++ = 0; |
| |
| memcpy(ptr, |
| (const uint8_t *)buffer->data() + buffer->range_offset(), |
| buffer->range_length()); |
| |
| ptr += buffer->range_length(); |
| |
| mAACBuffer->setRange(0, ptr - mAACBuffer->data()); |
| |
| return accessUnitPosted; |
| } |
| |
| bool MPEG2TSWriter::SourceInfo::flushAACFrames() { |
| if (mAACBuffer == NULL) { |
| return false; |
| } |
| |
| sp<AMessage> notify = mNotify->dup(); |
| notify->setInt32("what", kNotifyBuffer); |
| notify->setBuffer("buffer", mAACBuffer); |
| notify->post(); |
| |
| mAACBuffer.clear(); |
| |
| return true; |
| } |
| |
| void MPEG2TSWriter::SourceInfo::readMore() { |
| (new AMessage(kWhatRead, id()))->post(); |
| } |
| |
| void MPEG2TSWriter::SourceInfo::onMessageReceived(const sp<AMessage> &msg) { |
| switch (msg->what()) { |
| case kWhatStart: |
| { |
| status_t err = mSource->start(); |
| if (err != OK) { |
| sp<AMessage> notify = mNotify->dup(); |
| notify->setInt32("what", kNotifyStartFailed); |
| notify->post(); |
| break; |
| } |
| |
| extractCodecSpecificData(); |
| |
| readMore(); |
| break; |
| } |
| |
| case kWhatRead: |
| { |
| MediaBuffer *buffer; |
| status_t err = mSource->read(&buffer); |
| |
| if (err != OK && err != INFO_FORMAT_CHANGED) { |
| if (mStreamType == 0x0f) { |
| flushAACFrames(); |
| } |
| |
| sp<AMessage> notify = mNotify->dup(); |
| notify->setInt32("what", kNotifyReachedEOS); |
| notify->setInt32("status", err); |
| notify->post(); |
| break; |
| } |
| |
| if (err == OK) { |
| if (mStreamType == 0x0f && mAACCodecSpecificData == NULL) { |
| // The first buffer contains codec specific data. |
| |
| CHECK_GE(buffer->range_length(), 2u); |
| |
| mAACCodecSpecificData = new ABuffer(buffer->range_length()); |
| |
| memcpy(mAACCodecSpecificData->data(), |
| (const uint8_t *)buffer->data() |
| + buffer->range_offset(), |
| buffer->range_length()); |
| } else if (buffer->range_length() > 0) { |
| if (mStreamType == 0x0f) { |
| if (!appendAACFrames(buffer)) { |
| msg->post(); |
| } |
| } else { |
| postAVCFrame(buffer); |
| } |
| } else { |
| readMore(); |
| } |
| |
| buffer->release(); |
| buffer = NULL; |
| } |
| |
| // Do not read more data until told to. |
| break; |
| } |
| |
| default: |
| TRESPASS(); |
| } |
| } |
| |
| sp<ABuffer> MPEG2TSWriter::SourceInfo::lastAccessUnit() { |
| return mLastAccessUnit; |
| } |
| |
| void MPEG2TSWriter::SourceInfo::setLastAccessUnit( |
| const sp<ABuffer> &accessUnit) { |
| mLastAccessUnit = accessUnit; |
| } |
| |
| int64_t MPEG2TSWriter::SourceInfo::lastAccessUnitTimeUs() { |
| if (mLastAccessUnit == NULL) { |
| return -1; |
| } |
| |
| int64_t timeUs; |
| CHECK(mLastAccessUnit->meta()->findInt64("timeUs", &timeUs)); |
| |
| return timeUs; |
| } |
| |
| void MPEG2TSWriter::SourceInfo::setEOSReceived() { |
| CHECK(!mEOSReceived); |
| mEOSReceived = true; |
| } |
| |
| bool MPEG2TSWriter::SourceInfo::eosReceived() const { |
| return mEOSReceived; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| MPEG2TSWriter::MPEG2TSWriter(int fd) |
| : mFile(fdopen(dup(fd), "wb")), |
| mWriteCookie(NULL), |
| mWriteFunc(NULL), |
| mStarted(false), |
| mNumSourcesDone(0), |
| mNumTSPacketsWritten(0), |
| mNumTSPacketsBeforeMeta(0), |
| mPATContinuityCounter(0), |
| mPMTContinuityCounter(0) { |
| init(); |
| } |
| |
| MPEG2TSWriter::MPEG2TSWriter(const char *filename) |
| : mFile(fopen(filename, "wb")), |
| mWriteCookie(NULL), |
| mWriteFunc(NULL), |
| mStarted(false), |
| mNumSourcesDone(0), |
| mNumTSPacketsWritten(0), |
| mNumTSPacketsBeforeMeta(0), |
| mPATContinuityCounter(0), |
| mPMTContinuityCounter(0) { |
| init(); |
| } |
| |
| MPEG2TSWriter::MPEG2TSWriter( |
| void *cookie, |
| ssize_t (*write)(void *cookie, const void *data, size_t size)) |
| : mFile(NULL), |
| mWriteCookie(cookie), |
| mWriteFunc(write), |
| mStarted(false), |
| mNumSourcesDone(0), |
| mNumTSPacketsWritten(0), |
| mNumTSPacketsBeforeMeta(0), |
| mPATContinuityCounter(0), |
| mPMTContinuityCounter(0) { |
| init(); |
| } |
| |
| void MPEG2TSWriter::init() { |
| CHECK(mFile != NULL || mWriteFunc != NULL); |
| |
| initCrcTable(); |
| |
| mLooper = new ALooper; |
| mLooper->setName("MPEG2TSWriter"); |
| |
| mReflector = new AHandlerReflector<MPEG2TSWriter>(this); |
| |
| mLooper->registerHandler(mReflector); |
| mLooper->start(); |
| } |
| |
| MPEG2TSWriter::~MPEG2TSWriter() { |
| if (mStarted) { |
| reset(); |
| } |
| |
| mLooper->unregisterHandler(mReflector->id()); |
| mLooper->stop(); |
| |
| if (mFile != NULL) { |
| fclose(mFile); |
| mFile = NULL; |
| } |
| } |
| |
| status_t MPEG2TSWriter::addSource(const sp<MediaSource> &source) { |
| CHECK(!mStarted); |
| |
| sp<MetaData> meta = source->getFormat(); |
| const char *mime; |
| CHECK(meta->findCString(kKeyMIMEType, &mime)); |
| |
| if (strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC) |
| && strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC)) { |
| return ERROR_UNSUPPORTED; |
| } |
| |
| sp<SourceInfo> info = new SourceInfo(source); |
| |
| mSources.push(info); |
| |
| return OK; |
| } |
| |
| status_t MPEG2TSWriter::start(MetaData * /* param */) { |
| CHECK(!mStarted); |
| |
| mStarted = true; |
| mNumSourcesDone = 0; |
| mNumTSPacketsWritten = 0; |
| mNumTSPacketsBeforeMeta = 0; |
| |
| for (size_t i = 0; i < mSources.size(); ++i) { |
| sp<AMessage> notify = |
| new AMessage(kWhatSourceNotify, mReflector->id()); |
| |
| notify->setInt32("source-index", i); |
| |
| mSources.editItemAt(i)->start(notify); |
| } |
| |
| return OK; |
| } |
| |
| status_t MPEG2TSWriter::reset() { |
| CHECK(mStarted); |
| |
| for (size_t i = 0; i < mSources.size(); ++i) { |
| mSources.editItemAt(i)->stop(); |
| } |
| mStarted = false; |
| |
| return OK; |
| } |
| |
| status_t MPEG2TSWriter::pause() { |
| CHECK(mStarted); |
| |
| return OK; |
| } |
| |
| bool MPEG2TSWriter::reachedEOS() { |
| return !mStarted || (mNumSourcesDone == mSources.size() ? true : false); |
| } |
| |
| status_t MPEG2TSWriter::dump( |
| int /* fd */, const Vector<String16> & /* args */) { |
| return OK; |
| } |
| |
| void MPEG2TSWriter::onMessageReceived(const sp<AMessage> &msg) { |
| switch (msg->what()) { |
| case kWhatSourceNotify: |
| { |
| int32_t sourceIndex; |
| CHECK(msg->findInt32("source-index", &sourceIndex)); |
| |
| int32_t what; |
| CHECK(msg->findInt32("what", &what)); |
| |
| if (what == SourceInfo::kNotifyReachedEOS |
| || what == SourceInfo::kNotifyStartFailed) { |
| sp<SourceInfo> source = mSources.editItemAt(sourceIndex); |
| source->setEOSReceived(); |
| |
| sp<ABuffer> buffer = source->lastAccessUnit(); |
| source->setLastAccessUnit(NULL); |
| |
| if (buffer != NULL) { |
| writeTS(); |
| writeAccessUnit(sourceIndex, buffer); |
| } |
| |
| ++mNumSourcesDone; |
| } else if (what == SourceInfo::kNotifyBuffer) { |
| sp<ABuffer> buffer; |
| CHECK(msg->findBuffer("buffer", &buffer)); |
| |
| int32_t oob; |
| if (msg->findInt32("oob", &oob) && oob) { |
| // This is codec specific data delivered out of band. |
| // It can be written out immediately. |
| writeTS(); |
| writeAccessUnit(sourceIndex, buffer); |
| break; |
| } |
| |
| // We don't just write out data as we receive it from |
| // the various sources. That would essentially write them |
| // out in random order (as the thread scheduler determines |
| // how the messages are dispatched). |
| // Instead we gather an access unit for all tracks and |
| // write out the one with the smallest timestamp, then |
| // request more data for the written out track. |
| // Rinse, repeat. |
| // If we don't have data on any track we don't write |
| // anything just yet. |
| |
| sp<SourceInfo> source = mSources.editItemAt(sourceIndex); |
| |
| CHECK(source->lastAccessUnit() == NULL); |
| source->setLastAccessUnit(buffer); |
| |
| ALOGV("lastAccessUnitTimeUs[%d] = %.2f secs", |
| sourceIndex, source->lastAccessUnitTimeUs() / 1E6); |
| |
| int64_t minTimeUs = -1; |
| size_t minIndex = 0; |
| |
| for (size_t i = 0; i < mSources.size(); ++i) { |
| const sp<SourceInfo> &source = mSources.editItemAt(i); |
| |
| if (source->eosReceived()) { |
| continue; |
| } |
| |
| int64_t timeUs = source->lastAccessUnitTimeUs(); |
| if (timeUs < 0) { |
| minTimeUs = -1; |
| break; |
| } else if (minTimeUs < 0 || timeUs < minTimeUs) { |
| minTimeUs = timeUs; |
| minIndex = i; |
| } |
| } |
| |
| if (minTimeUs < 0) { |
| ALOGV("not a all tracks have valid data."); |
| break; |
| } |
| |
| ALOGV("writing access unit at time %.2f secs (index %zu)", |
| minTimeUs / 1E6, minIndex); |
| |
| source = mSources.editItemAt(minIndex); |
| |
| buffer = source->lastAccessUnit(); |
| source->setLastAccessUnit(NULL); |
| |
| writeTS(); |
| writeAccessUnit(minIndex, buffer); |
| |
| source->readMore(); |
| } |
| break; |
| } |
| |
| default: |
| TRESPASS(); |
| } |
| } |
| |
| void MPEG2TSWriter::writeProgramAssociationTable() { |
| // 0x47 |
| // transport_error_indicator = b0 |
| // payload_unit_start_indicator = b1 |
| // transport_priority = b0 |
| // PID = b0000000000000 (13 bits) |
| // transport_scrambling_control = b00 |
| // adaptation_field_control = b01 (no adaptation field, payload only) |
| // continuity_counter = b???? |
| // skip = 0x00 |
| // --- payload follows |
| // table_id = 0x00 |
| // section_syntax_indicator = b1 |
| // must_be_zero = b0 |
| // reserved = b11 |
| // section_length = 0x00d |
| // transport_stream_id = 0x0000 |
| // reserved = b11 |
| // version_number = b00001 |
| // current_next_indicator = b1 |
| // section_number = 0x00 |
| // last_section_number = 0x00 |
| // one program follows: |
| // program_number = 0x0001 |
| // reserved = b111 |
| // program_map_PID = 0x01e0 (13 bits!) |
| // CRC = 0x???????? |
| |
| static const uint8_t kData[] = { |
| 0x47, |
| 0x40, 0x00, 0x10, 0x00, // b0100 0000 0000 0000 0001 ???? 0000 0000 |
| 0x00, 0xb0, 0x0d, 0x00, // b0000 0000 1011 0000 0000 1101 0000 0000 |
| 0x00, 0xc3, 0x00, 0x00, // b0000 0000 1100 0011 0000 0000 0000 0000 |
| 0x00, 0x01, 0xe1, 0xe0, // b0000 0000 0000 0001 1110 0001 1110 0000 |
| 0x00, 0x00, 0x00, 0x00 // b???? ???? ???? ???? ???? ???? ???? ???? |
| }; |
| |
| sp<ABuffer> buffer = new ABuffer(188); |
| memset(buffer->data(), 0xff, buffer->size()); |
| memcpy(buffer->data(), kData, sizeof(kData)); |
| |
| if (++mPATContinuityCounter == 16) { |
| mPATContinuityCounter = 0; |
| } |
| buffer->data()[3] |= mPATContinuityCounter; |
| |
| uint32_t crc = htonl(crc32(&buffer->data()[5], 12)); |
| memcpy(&buffer->data()[17], &crc, sizeof(crc)); |
| |
| CHECK_EQ(internalWrite(buffer->data(), buffer->size()), buffer->size()); |
| } |
| |
| void MPEG2TSWriter::writeProgramMap() { |
| // 0x47 |
| // transport_error_indicator = b0 |
| // payload_unit_start_indicator = b1 |
| // transport_priority = b0 |
| // PID = b0 0001 1110 0000 (13 bits) [0x1e0] |
| // transport_scrambling_control = b00 |
| // adaptation_field_control = b01 (no adaptation field, payload only) |
| // continuity_counter = b???? |
| // skip = 0x00 |
| // -- payload follows |
| // table_id = 0x02 |
| // section_syntax_indicator = b1 |
| // must_be_zero = b0 |
| // reserved = b11 |
| // section_length = 0x??? |
| // program_number = 0x0001 |
| // reserved = b11 |
| // version_number = b00001 |
| // current_next_indicator = b1 |
| // section_number = 0x00 |
| // last_section_number = 0x00 |
| // reserved = b111 |
| // PCR_PID = b? ???? ???? ???? (13 bits) |
| // reserved = b1111 |
| // program_info_length = 0x000 |
| // one or more elementary stream descriptions follow: |
| // stream_type = 0x?? |
| // reserved = b111 |
| // elementary_PID = b? ???? ???? ???? (13 bits) |
| // reserved = b1111 |
| // ES_info_length = 0x000 |
| // CRC = 0x???????? |
| |
| static const uint8_t kData[] = { |
| 0x47, |
| 0x41, 0xe0, 0x10, 0x00, // b0100 0001 1110 0000 0001 ???? 0000 0000 |
| 0x02, 0xb0, 0x00, 0x00, // b0000 0010 1011 ???? ???? ???? 0000 0000 |
| 0x01, 0xc3, 0x00, 0x00, // b0000 0001 1100 0011 0000 0000 0000 0000 |
| 0xe0, 0x00, 0xf0, 0x00 // b111? ???? ???? ???? 1111 0000 0000 0000 |
| }; |
| |
| sp<ABuffer> buffer = new ABuffer(188); |
| memset(buffer->data(), 0xff, buffer->size()); |
| memcpy(buffer->data(), kData, sizeof(kData)); |
| |
| if (++mPMTContinuityCounter == 16) { |
| mPMTContinuityCounter = 0; |
| } |
| buffer->data()[3] |= mPMTContinuityCounter; |
| |
| size_t section_length = 5 * mSources.size() + 4 + 9; |
| buffer->data()[6] |= section_length >> 8; |
| buffer->data()[7] = section_length & 0xff; |
| |
| static const unsigned kPCR_PID = 0x1e1; |
| buffer->data()[13] |= (kPCR_PID >> 8) & 0x1f; |
| buffer->data()[14] = kPCR_PID & 0xff; |
| |
| uint8_t *ptr = &buffer->data()[sizeof(kData)]; |
| for (size_t i = 0; i < mSources.size(); ++i) { |
| *ptr++ = mSources.editItemAt(i)->streamType(); |
| |
| const unsigned ES_PID = 0x1e0 + i + 1; |
| *ptr++ = 0xe0 | (ES_PID >> 8); |
| *ptr++ = ES_PID & 0xff; |
| *ptr++ = 0xf0; |
| *ptr++ = 0x00; |
| } |
| |
| uint32_t crc = htonl(crc32(&buffer->data()[5], 12+mSources.size()*5)); |
| memcpy(&buffer->data()[17+mSources.size()*5], &crc, sizeof(crc)); |
| |
| CHECK_EQ(internalWrite(buffer->data(), buffer->size()), buffer->size()); |
| } |
| |
| void MPEG2TSWriter::writeAccessUnit( |
| int32_t sourceIndex, const sp<ABuffer> &accessUnit) { |
| // 0x47 |
| // transport_error_indicator = b0 |
| // payload_unit_start_indicator = b1 |
| // transport_priority = b0 |
| // PID = b0 0001 1110 ???? (13 bits) [0x1e0 + 1 + sourceIndex] |
| // transport_scrambling_control = b00 |
| // adaptation_field_control = b?? |
| // continuity_counter = b???? |
| // -- payload follows |
| // packet_startcode_prefix = 0x000001 |
| // stream_id = 0x?? (0xe0 for avc video, 0xc0 for aac audio) |
| // PES_packet_length = 0x???? |
| // reserved = b10 |
| // PES_scrambling_control = b00 |
| // PES_priority = b0 |
| // data_alignment_indicator = b1 |
| // copyright = b0 |
| // original_or_copy = b0 |
| // PTS_DTS_flags = b10 (PTS only) |
| // ESCR_flag = b0 |
| // ES_rate_flag = b0 |
| // DSM_trick_mode_flag = b0 |
| // additional_copy_info_flag = b0 |
| // PES_CRC_flag = b0 |
| // PES_extension_flag = b0 |
| // PES_header_data_length = 0x05 |
| // reserved = b0010 (PTS) |
| // PTS[32..30] = b??? |
| // reserved = b1 |
| // PTS[29..15] = b??? ???? ???? ???? (15 bits) |
| // reserved = b1 |
| // PTS[14..0] = b??? ???? ???? ???? (15 bits) |
| // reserved = b1 |
| // the first fragment of "buffer" follows |
| |
| sp<ABuffer> buffer = new ABuffer(188); |
| memset(buffer->data(), 0xff, buffer->size()); |
| |
| const unsigned PID = 0x1e0 + sourceIndex + 1; |
| |
| const unsigned continuity_counter = |
| mSources.editItemAt(sourceIndex)->incrementContinuityCounter(); |
| |
| // XXX if there are multiple streams of a kind (more than 1 audio or |
| // more than 1 video) they need distinct stream_ids. |
| const unsigned stream_id = |
| mSources.editItemAt(sourceIndex)->streamType() == 0x0f ? 0xc0 : 0xe0; |
| |
| int64_t timeUs; |
| CHECK(accessUnit->meta()->findInt64("timeUs", &timeUs)); |
| |
| uint32_t PTS = (timeUs * 9ll) / 100ll; |
| |
| size_t PES_packet_length = accessUnit->size() + 8; |
| bool padding = (accessUnit->size() < (188 - 18)); |
| |
| if (PES_packet_length >= 65536) { |
| // This really should only happen for video. |
| CHECK_EQ(stream_id, 0xe0u); |
| |
| // It's valid to set this to 0 for video according to the specs. |
| PES_packet_length = 0; |
| } |
| |
| uint8_t *ptr = buffer->data(); |
| *ptr++ = 0x47; |
| *ptr++ = 0x40 | (PID >> 8); |
| *ptr++ = PID & 0xff; |
| *ptr++ = (padding ? 0x30 : 0x10) | continuity_counter; |
| if (padding) { |
| int paddingSize = 188 - accessUnit->size() - 18; |
| *ptr++ = paddingSize - 1; |
| if (paddingSize >= 2) { |
| *ptr++ = 0x00; |
| ptr += paddingSize - 2; |
| } |
| } |
| *ptr++ = 0x00; |
| *ptr++ = 0x00; |
| *ptr++ = 0x01; |
| *ptr++ = stream_id; |
| *ptr++ = PES_packet_length >> 8; |
| *ptr++ = PES_packet_length & 0xff; |
| *ptr++ = 0x84; |
| *ptr++ = 0x80; |
| *ptr++ = 0x05; |
| *ptr++ = 0x20 | (((PTS >> 30) & 7) << 1) | 1; |
| *ptr++ = (PTS >> 22) & 0xff; |
| *ptr++ = (((PTS >> 15) & 0x7f) << 1) | 1; |
| *ptr++ = (PTS >> 7) & 0xff; |
| *ptr++ = ((PTS & 0x7f) << 1) | 1; |
| |
| size_t sizeLeft = buffer->data() + buffer->size() - ptr; |
| size_t copy = accessUnit->size(); |
| if (copy > sizeLeft) { |
| copy = sizeLeft; |
| } |
| |
| memcpy(ptr, accessUnit->data(), copy); |
| |
| CHECK_EQ(internalWrite(buffer->data(), buffer->size()), buffer->size()); |
| |
| size_t offset = copy; |
| while (offset < accessUnit->size()) { |
| bool lastAccessUnit = ((accessUnit->size() - offset) < 184); |
| // for subsequent fragments of "buffer": |
| // 0x47 |
| // transport_error_indicator = b0 |
| // payload_unit_start_indicator = b0 |
| // transport_priority = b0 |
| // PID = b0 0001 1110 ???? (13 bits) [0x1e0 + 1 + sourceIndex] |
| // transport_scrambling_control = b00 |
| // adaptation_field_control = b?? |
| // continuity_counter = b???? |
| // the fragment of "buffer" follows. |
| |
| memset(buffer->data(), 0xff, buffer->size()); |
| |
| const unsigned continuity_counter = |
| mSources.editItemAt(sourceIndex)->incrementContinuityCounter(); |
| |
| ptr = buffer->data(); |
| *ptr++ = 0x47; |
| *ptr++ = 0x00 | (PID >> 8); |
| *ptr++ = PID & 0xff; |
| *ptr++ = (lastAccessUnit ? 0x30 : 0x10) | continuity_counter; |
| |
| if (lastAccessUnit) { |
| // Pad packet using an adaptation field |
| // Adaptation header all to 0 execpt size |
| uint8_t paddingSize = (uint8_t)184 - (accessUnit->size() - offset); |
| *ptr++ = paddingSize - 1; |
| if (paddingSize >= 2) { |
| *ptr++ = 0x00; |
| ptr += paddingSize - 2; |
| } |
| } |
| |
| size_t sizeLeft = buffer->data() + buffer->size() - ptr; |
| size_t copy = accessUnit->size() - offset; |
| if (copy > sizeLeft) { |
| copy = sizeLeft; |
| } |
| |
| memcpy(ptr, accessUnit->data() + offset, copy); |
| CHECK_EQ(internalWrite(buffer->data(), buffer->size()), |
| buffer->size()); |
| |
| offset += copy; |
| } |
| } |
| |
| void MPEG2TSWriter::writeTS() { |
| if (mNumTSPacketsWritten >= mNumTSPacketsBeforeMeta) { |
| writeProgramAssociationTable(); |
| writeProgramMap(); |
| |
| mNumTSPacketsBeforeMeta = mNumTSPacketsWritten + 2500; |
| } |
| } |
| |
| void MPEG2TSWriter::initCrcTable() { |
| uint32_t poly = 0x04C11DB7; |
| |
| for (int i = 0; i < 256; i++) { |
| uint32_t crc = i << 24; |
| for (int j = 0; j < 8; j++) { |
| crc = (crc << 1) ^ ((crc & 0x80000000) ? (poly) : 0); |
| } |
| mCrcTable[i] = crc; |
| } |
| } |
| |
| /** |
| * Compute CRC32 checksum for buffer starting at offset start and for length |
| * bytes. |
| */ |
| uint32_t MPEG2TSWriter::crc32(const uint8_t *p_start, size_t length) { |
| uint32_t crc = 0xFFFFFFFF; |
| const uint8_t *p; |
| |
| for (p = p_start; p < p_start + length; p++) { |
| crc = (crc << 8) ^ mCrcTable[((crc >> 24) ^ *p) & 0xFF]; |
| } |
| |
| return crc; |
| } |
| |
| ssize_t MPEG2TSWriter::internalWrite(const void *data, size_t size) { |
| if (mFile != NULL) { |
| return fwrite(data, 1, size, mFile); |
| } |
| |
| return (*mWriteFunc)(mWriteCookie, data, size); |
| } |
| |
| } // namespace android |
| |