diff options
Diffstat (limited to 'media/libstagefright/webm/WebmWriter.cpp')
-rw-r--r-- | media/libstagefright/webm/WebmWriter.cpp | 551 |
1 files changed, 551 insertions, 0 deletions
diff --git a/media/libstagefright/webm/WebmWriter.cpp b/media/libstagefright/webm/WebmWriter.cpp new file mode 100644 index 0000000..03cf92a --- /dev/null +++ b/media/libstagefright/webm/WebmWriter.cpp @@ -0,0 +1,551 @@ +/* + * Copyright (C) 2014 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 "WebmWriter" + +#include "EbmlUtil.h" +#include "WebmWriter.h" + +#include <media/stagefright/MetaData.h> +#include <media/stagefright/MediaDefs.h> +#include <media/stagefright/foundation/ADebug.h> + +#include <utils/Errors.h> + +#include <unistd.h> +#include <fcntl.h> +#include <sys/stat.h> +#include <inttypes.h> + +using namespace webm; + +namespace { +size_t XiphLaceCodeLen(size_t size) { + return size / 0xff + 1; +} + +size_t XiphLaceEnc(uint8_t *buf, size_t size) { + size_t i; + for (i = 0; size >= 0xff; ++i, size -= 0xff) { + buf[i] = 0xff; + } + buf[i++] = size; + return i; +} +} + +namespace android { + +static const int64_t kMinStreamableFileSizeInBytes = 5 * 1024 * 1024; + +WebmWriter::WebmWriter(int fd) + : mFd(dup(fd)), + mInitCheck(mFd < 0 ? NO_INIT : OK), + mTimeCodeScale(1000000), + mStartTimestampUs(0), + mStartTimeOffsetMs(0), + mSegmentOffset(0), + mSegmentDataStart(0), + mInfoOffset(0), + mInfoSize(0), + mTracksOffset(0), + mCuesOffset(0), + mPaused(false), + mStarted(false), + mIsFileSizeLimitExplicitlyRequested(false), + mIsRealTimeRecording(false), + mStreamableFile(true), + mEstimatedCuesSize(0) { + mStreams[kAudioIndex] = WebmStream(kAudioType, "Audio", &WebmWriter::audioTrack); + mStreams[kVideoIndex] = WebmStream(kVideoType, "Video", &WebmWriter::videoTrack); + mSinkThread = new WebmFrameSinkThread( + mFd, + mSegmentDataStart, + mStreams[kVideoIndex].mSink, + mStreams[kAudioIndex].mSink, + mCuePoints); +} + +WebmWriter::WebmWriter(const char *filename) + : mInitCheck(NO_INIT), + mTimeCodeScale(1000000), + mStartTimestampUs(0), + mStartTimeOffsetMs(0), + mSegmentOffset(0), + mSegmentDataStart(0), + mInfoOffset(0), + mInfoSize(0), + mTracksOffset(0), + mCuesOffset(0), + mPaused(false), + mStarted(false), + mIsFileSizeLimitExplicitlyRequested(false), + mIsRealTimeRecording(false), + mStreamableFile(true), + mEstimatedCuesSize(0) { + mFd = open(filename, O_CREAT | O_LARGEFILE | O_TRUNC | O_RDWR, S_IRUSR | S_IWUSR); + if (mFd >= 0) { + ALOGV("fd %d; flags: %o", mFd, fcntl(mFd, F_GETFL, 0)); + mInitCheck = OK; + } + mStreams[kAudioIndex] = WebmStream(kAudioType, "Audio", &WebmWriter::audioTrack); + mStreams[kVideoIndex] = WebmStream(kVideoType, "Video", &WebmWriter::videoTrack); + mSinkThread = new WebmFrameSinkThread( + mFd, + mSegmentDataStart, + mStreams[kVideoIndex].mSink, + mStreams[kAudioIndex].mSink, + mCuePoints); +} + +// static +sp<WebmElement> WebmWriter::videoTrack(const sp<MetaData>& md) { + int32_t width, height; + CHECK(md->findInt32(kKeyWidth, &width)); + CHECK(md->findInt32(kKeyHeight, &height)); + return WebmElement::VideoTrackEntry(width, height); +} + +// static +sp<WebmElement> WebmWriter::audioTrack(const sp<MetaData>& md) { + int32_t nChannels, samplerate; + uint32_t type; + const void *headerData1; + const char headerData2[] = { 3, 'v', 'o', 'r', 'b', 'i', 's', 7, 0, 0, 0, + 'a', 'n', 'd', 'r', 'o', 'i', 'd', 0, 0, 0, 0, 1 }; + const void *headerData3; + size_t headerSize1, headerSize2 = sizeof(headerData2), headerSize3; + + CHECK(md->findInt32(kKeyChannelCount, &nChannels)); + CHECK(md->findInt32(kKeySampleRate, &samplerate)); + CHECK(md->findData(kKeyVorbisInfo, &type, &headerData1, &headerSize1)); + CHECK(md->findData(kKeyVorbisBooks, &type, &headerData3, &headerSize3)); + + size_t codecPrivateSize = 1; + codecPrivateSize += XiphLaceCodeLen(headerSize1); + codecPrivateSize += XiphLaceCodeLen(headerSize2); + codecPrivateSize += headerSize1 + headerSize2 + headerSize3; + + off_t off = 0; + sp<ABuffer> codecPrivateBuf = new ABuffer(codecPrivateSize); + uint8_t *codecPrivateData = codecPrivateBuf->data(); + codecPrivateData[off++] = 2; + + off += XiphLaceEnc(codecPrivateData + off, headerSize1); + off += XiphLaceEnc(codecPrivateData + off, headerSize2); + + memcpy(codecPrivateData + off, headerData1, headerSize1); + off += headerSize1; + memcpy(codecPrivateData + off, headerData2, headerSize2); + off += headerSize2; + memcpy(codecPrivateData + off, headerData3, headerSize3); + + sp<WebmElement> entry = WebmElement::AudioTrackEntry( + nChannels, + samplerate, + codecPrivateBuf); + return entry; +} + +size_t WebmWriter::numTracks() { + Mutex::Autolock autolock(mLock); + + size_t numTracks = 0; + for (size_t i = 0; i < kMaxStreams; ++i) { + if (mStreams[i].mTrackEntry != NULL) { + numTracks++; + } + } + + return numTracks; +} + +uint64_t WebmWriter::estimateCuesSize(int32_t bitRate) { + // This implementation is based on estimateMoovBoxSize in MPEG4Writer. + // + // Statistical analysis shows that metadata usually accounts + // for a small portion of the total file size, usually < 0.6%. + + // The default MIN_MOOV_BOX_SIZE is set to 0.6% x 1MB / 2, + // where 1MB is the common file size limit for MMS application. + // The default MAX _MOOV_BOX_SIZE value is based on about 3 + // minute video recording with a bit rate about 3 Mbps, because + // statistics also show that most of the video captured are going + // to be less than 3 minutes. + + // If the estimation is wrong, we will pay the price of wasting + // some reserved space. This should not happen so often statistically. + static const int32_t factor = 2; + static const int64_t MIN_CUES_SIZE = 3 * 1024; // 3 KB + static const int64_t MAX_CUES_SIZE = (180 * 3000000 * 6LL / 8000); + int64_t size = MIN_CUES_SIZE; + + // Max file size limit is set + if (mMaxFileSizeLimitBytes != 0 && mIsFileSizeLimitExplicitlyRequested) { + size = mMaxFileSizeLimitBytes * 6 / 1000; + } + + // Max file duration limit is set + if (mMaxFileDurationLimitUs != 0) { + if (bitRate > 0) { + int64_t size2 = ((mMaxFileDurationLimitUs * bitRate * 6) / 1000 / 8000000); + if (mMaxFileSizeLimitBytes != 0 && mIsFileSizeLimitExplicitlyRequested) { + // When both file size and duration limits are set, + // we use the smaller limit of the two. + if (size > size2) { + size = size2; + } + } else { + // Only max file duration limit is set + size = size2; + } + } + } + + if (size < MIN_CUES_SIZE) { + size = MIN_CUES_SIZE; + } + + // Any long duration recording will be probably end up with + // non-streamable webm file. + if (size > MAX_CUES_SIZE) { + size = MAX_CUES_SIZE; + } + + ALOGV("limits: %" PRId64 "/%" PRId64 " bytes/us," + " bit rate: %d bps and the estimated cues size %" PRId64 " bytes", + mMaxFileSizeLimitBytes, mMaxFileDurationLimitUs, bitRate, size); + return factor * size; +} + +void WebmWriter::initStream(size_t idx) { + if (mStreams[idx].mThread != NULL) { + return; + } + if (mStreams[idx].mSource == NULL) { + ALOGV("adding dummy source ... "); + mStreams[idx].mThread = new WebmFrameEmptySourceThread( + mStreams[idx].mType, mStreams[idx].mSink); + } else { + ALOGV("adding source %p", mStreams[idx].mSource.get()); + mStreams[idx].mThread = new WebmFrameMediaSourceThread( + mStreams[idx].mSource, + mStreams[idx].mType, + mStreams[idx].mSink, + mTimeCodeScale, + mStartTimestampUs, + mStartTimeOffsetMs, + numTracks(), + mIsRealTimeRecording); + } +} + +void WebmWriter::release() { + close(mFd); + mFd = -1; + mInitCheck = NO_INIT; + mStarted = false; +} + +status_t WebmWriter::reset() { + if (mInitCheck != OK) { + return OK; + } else { + if (!mStarted) { + release(); + return OK; + } + } + + status_t err = OK; + int64_t maxDurationUs = 0; + int64_t minDurationUs = 0x7fffffffffffffffLL; + for (int i = 0; i < kMaxStreams; ++i) { + if (mStreams[i].mThread == NULL) { + continue; + } + + status_t status = mStreams[i].mThread->stop(); + if (err == OK && status != OK) { + err = status; + } + + int64_t durationUs = mStreams[i].mThread->getDurationUs(); + if (durationUs > maxDurationUs) { + maxDurationUs = durationUs; + } + if (durationUs < minDurationUs) { + minDurationUs = durationUs; + } + } + + if (numTracks() > 1) { + ALOGD("Duration from tracks range is [%" PRId64 ", %" PRId64 "] us", minDurationUs, maxDurationUs); + } + + mSinkThread->stop(); + + // Do not write out movie header on error. + if (err != OK) { + release(); + return err; + } + + sp<WebmElement> cues = new WebmMaster(kMkvCues, mCuePoints); + uint64_t cuesSize = cues->totalSize(); + // TRICKY Even when the cues do fit in the space we reserved, if they do not fit + // perfectly, we still need to check if there is enough "extra space" to write an + // EBML void element. + if (cuesSize != mEstimatedCuesSize && cuesSize > mEstimatedCuesSize - kMinEbmlVoidSize) { + mCuesOffset = ::lseek(mFd, 0, SEEK_CUR); + cues->write(mFd, cuesSize); + } else { + uint64_t spaceSize; + ::lseek(mFd, mCuesOffset, SEEK_SET); + cues->write(mFd, cuesSize); + sp<WebmElement> space = new EbmlVoid(mEstimatedCuesSize - cuesSize); + space->write(mFd, spaceSize); + } + + mCuePoints.clear(); + mStreams[kVideoIndex].mSink.clear(); + mStreams[kAudioIndex].mSink.clear(); + + uint8_t bary[sizeof(uint64_t)]; + uint64_t totalSize = ::lseek(mFd, 0, SEEK_END); + uint64_t segmentSize = totalSize - mSegmentDataStart; + ::lseek(mFd, mSegmentOffset + sizeOf(kMkvSegment), SEEK_SET); + uint64_t segmentSizeCoded = encodeUnsigned(segmentSize, sizeOf(kMkvUnknownLength)); + serializeCodedUnsigned(segmentSizeCoded, bary); + ::write(mFd, bary, sizeOf(kMkvUnknownLength)); + + uint64_t size; + uint64_t durationOffset = mInfoOffset + sizeOf(kMkvInfo) + sizeOf(mInfoSize) + + sizeOf(kMkvSegmentDuration) + sizeOf(sizeof(double)); + sp<WebmElement> duration = new WebmFloat( + kMkvSegmentDuration, + (double) (maxDurationUs * 1000 / mTimeCodeScale)); + duration->serializePayload(bary); + ::lseek(mFd, durationOffset, SEEK_SET); + ::write(mFd, bary, sizeof(double)); + + List<sp<WebmElement> > seekEntries; + seekEntries.push_back(WebmElement::SeekEntry(kMkvInfo, mInfoOffset - mSegmentDataStart)); + seekEntries.push_back(WebmElement::SeekEntry(kMkvTracks, mTracksOffset - mSegmentDataStart)); + seekEntries.push_back(WebmElement::SeekEntry(kMkvCues, mCuesOffset - mSegmentDataStart)); + sp<WebmElement> seekHead = new WebmMaster(kMkvSeekHead, seekEntries); + + uint64_t metaSeekSize; + ::lseek(mFd, mSegmentDataStart, SEEK_SET); + seekHead->write(mFd, metaSeekSize); + + uint64_t spaceSize; + sp<WebmElement> space = new EbmlVoid(kMaxMetaSeekSize - metaSeekSize); + space->write(mFd, spaceSize); + + release(); + return err; +} + +status_t WebmWriter::addSource(const sp<MediaSource> &source) { + Mutex::Autolock l(mLock); + if (mStarted) { + ALOGE("Attempt to add source AFTER recording is started"); + return UNKNOWN_ERROR; + } + + // At most 2 tracks can be supported. + if (mStreams[kVideoIndex].mTrackEntry != NULL + && mStreams[kAudioIndex].mTrackEntry != NULL) { + ALOGE("Too many tracks (2) to add"); + return ERROR_UNSUPPORTED; + } + + CHECK(source != NULL); + + // A track of type other than video or audio is not supported. + const char *mime; + source->getFormat()->findCString(kKeyMIMEType, &mime); + const char *vp8 = MEDIA_MIMETYPE_VIDEO_VP8; + const char *vorbis = MEDIA_MIMETYPE_AUDIO_VORBIS; + + size_t streamIndex; + if (!strncasecmp(mime, vp8, strlen(vp8))) { + streamIndex = kVideoIndex; + } else if (!strncasecmp(mime, vorbis, strlen(vorbis))) { + streamIndex = kAudioIndex; + } else { + ALOGE("Track (%s) other than %s or %s is not supported", mime, vp8, vorbis); + return ERROR_UNSUPPORTED; + } + + // No more than one video or one audio track is supported. + if (mStreams[streamIndex].mTrackEntry != NULL) { + ALOGE("%s track already exists", mStreams[streamIndex].mName); + return ERROR_UNSUPPORTED; + } + + // This is the first track of either audio or video. + // Go ahead to add the track. + mStreams[streamIndex].mSource = source; + mStreams[streamIndex].mTrackEntry = mStreams[streamIndex].mMakeTrack(source->getFormat()); + + return OK; +} + +status_t WebmWriter::start(MetaData *params) { + if (mInitCheck != OK) { + return UNKNOWN_ERROR; + } + + if (mStreams[kVideoIndex].mTrackEntry == NULL + && mStreams[kAudioIndex].mTrackEntry == NULL) { + ALOGE("No source added"); + return INVALID_OPERATION; + } + + if (mMaxFileSizeLimitBytes != 0) { + mIsFileSizeLimitExplicitlyRequested = true; + } + + if (params) { + int32_t isRealTimeRecording; + params->findInt32(kKeyRealTimeRecording, &isRealTimeRecording); + mIsRealTimeRecording = isRealTimeRecording; + } + + if (mStarted) { + if (mPaused) { + mPaused = false; + mStreams[kAudioIndex].mThread->resume(); + mStreams[kVideoIndex].mThread->resume(); + } + return OK; + } + + if (params) { + int32_t tcsl; + if (params->findInt32(kKeyTimeScale, &tcsl)) { + mTimeCodeScale = tcsl; + } + } + CHECK_GT(mTimeCodeScale, 0); + ALOGV("movie time scale: %" PRIu64, mTimeCodeScale); + + /* + * When the requested file size limit is small, the priority + * is to meet the file size limit requirement, rather than + * to make the file streamable. mStreamableFile does not tell + * whether the actual recorded file is streamable or not. + */ + mStreamableFile = (!mMaxFileSizeLimitBytes) + || (mMaxFileSizeLimitBytes >= kMinStreamableFileSizeInBytes); + + /* + * Write various metadata. + */ + sp<WebmElement> ebml, segment, info, seekHead, tracks, cues; + ebml = WebmElement::EbmlHeader(); + segment = new WebmMaster(kMkvSegment); + seekHead = new EbmlVoid(kMaxMetaSeekSize); + info = WebmElement::SegmentInfo(mTimeCodeScale, 0); + + List<sp<WebmElement> > children; + for (size_t i = 0; i < kMaxStreams; ++i) { + if (mStreams[i].mTrackEntry != NULL) { + children.push_back(mStreams[i].mTrackEntry); + } + } + tracks = new WebmMaster(kMkvTracks, children); + + if (!mStreamableFile) { + cues = NULL; + } else { + int32_t bitRate = -1; + if (params) { + params->findInt32(kKeyBitRate, &bitRate); + } + mEstimatedCuesSize = estimateCuesSize(bitRate); + CHECK_GE(mEstimatedCuesSize, 8); + cues = new EbmlVoid(mEstimatedCuesSize); + } + + sp<WebmElement> elems[] = { ebml, segment, seekHead, info, tracks, cues }; + size_t nElems = sizeof(elems) / sizeof(elems[0]); + uint64_t offsets[nElems]; + uint64_t sizes[nElems]; + for (uint32_t i = 0; i < nElems; i++) { + WebmElement *e = elems[i].get(); + if (!e) { + continue; + } + + uint64_t size; + offsets[i] = ::lseek(mFd, 0, SEEK_CUR); + sizes[i] = e->mSize; + e->write(mFd, size); + } + + mSegmentOffset = offsets[1]; + mSegmentDataStart = offsets[2]; + mInfoOffset = offsets[3]; + mInfoSize = sizes[3]; + mTracksOffset = offsets[4]; + mCuesOffset = offsets[5]; + + // start threads + if (params) { + params->findInt64(kKeyTime, &mStartTimestampUs); + } + + initStream(kAudioIndex); + initStream(kVideoIndex); + + mStreams[kAudioIndex].mThread->start(); + mStreams[kVideoIndex].mThread->start(); + mSinkThread->start(); + + mStarted = true; + return OK; +} + +status_t WebmWriter::pause() { + if (mInitCheck != OK) { + return OK; + } + mPaused = true; + status_t err = OK; + for (int i = 0; i < kMaxStreams; ++i) { + if (mStreams[i].mThread == NULL) { + continue; + } + status_t status = mStreams[i].mThread->pause(); + if (status != OK) { + err = status; + } + } + return err; +} + +status_t WebmWriter::stop() { + return reset(); +} + +bool WebmWriter::reachedEOS() { + return !mSinkThread->running(); +} +} /* namespace android */ |