| /* |
| * Copyright (C) 2009 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_TAG "SampleTable" |
| //#define LOG_NDEBUG 0 |
| #include <utils/Log.h> |
| |
| #include "include/SampleTable.h" |
| #include "include/SampleIterator.h" |
| |
| #include <arpa/inet.h> |
| |
| #include <media/stagefright/DataSource.h> |
| #include <media/stagefright/MediaDebug.h> |
| #include <media/stagefright/Utils.h> |
| |
| namespace android { |
| |
| // static |
| const uint32_t SampleTable::kChunkOffsetType32 = FOURCC('s', 't', 'c', 'o'); |
| // static |
| const uint32_t SampleTable::kChunkOffsetType64 = FOURCC('c', 'o', '6', '4'); |
| // static |
| const uint32_t SampleTable::kSampleSizeType32 = FOURCC('s', 't', 's', 'z'); |
| // static |
| const uint32_t SampleTable::kSampleSizeTypeCompact = FOURCC('s', 't', 'z', '2'); |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| SampleTable::SampleTable(const sp<DataSource> &source) |
| : mDataSource(source), |
| mChunkOffsetOffset(-1), |
| mChunkOffsetType(0), |
| mNumChunkOffsets(0), |
| mSampleToChunkOffset(-1), |
| mNumSampleToChunkOffsets(0), |
| mSampleSizeOffset(-1), |
| mSampleSizeFieldSize(0), |
| mDefaultSampleSize(0), |
| mNumSampleSizes(0), |
| mTimeToSampleCount(0), |
| mTimeToSample(NULL), |
| mSyncSampleOffset(-1), |
| mNumSyncSamples(0), |
| mSampleToChunkEntries(NULL) { |
| mSampleIterator = new SampleIterator(this); |
| } |
| |
| SampleTable::~SampleTable() { |
| delete[] mSampleToChunkEntries; |
| mSampleToChunkEntries = NULL; |
| |
| delete[] mTimeToSample; |
| mTimeToSample = NULL; |
| |
| delete mSampleIterator; |
| mSampleIterator = NULL; |
| } |
| |
| status_t SampleTable::setChunkOffsetParams( |
| uint32_t type, off_t data_offset, size_t data_size) { |
| if (mChunkOffsetOffset >= 0) { |
| return ERROR_MALFORMED; |
| } |
| |
| CHECK(type == kChunkOffsetType32 || type == kChunkOffsetType64); |
| |
| mChunkOffsetOffset = data_offset; |
| mChunkOffsetType = type; |
| |
| if (data_size < 8) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t header[8]; |
| if (mDataSource->readAt( |
| data_offset, header, sizeof(header)) < (ssize_t)sizeof(header)) { |
| return ERROR_IO; |
| } |
| |
| if (U32_AT(header) != 0) { |
| // Expected version = 0, flags = 0. |
| return ERROR_MALFORMED; |
| } |
| |
| mNumChunkOffsets = U32_AT(&header[4]); |
| |
| if (mChunkOffsetType == kChunkOffsetType32) { |
| if (data_size < 8 + mNumChunkOffsets * 4) { |
| return ERROR_MALFORMED; |
| } |
| } else { |
| if (data_size < 8 + mNumChunkOffsets * 8) { |
| return ERROR_MALFORMED; |
| } |
| } |
| |
| return OK; |
| } |
| |
| status_t SampleTable::setSampleToChunkParams( |
| off_t data_offset, size_t data_size) { |
| if (mSampleToChunkOffset >= 0) { |
| return ERROR_MALFORMED; |
| } |
| |
| mSampleToChunkOffset = data_offset; |
| |
| if (data_size < 8) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t header[8]; |
| if (mDataSource->readAt( |
| data_offset, header, sizeof(header)) < (ssize_t)sizeof(header)) { |
| return ERROR_IO; |
| } |
| |
| if (U32_AT(header) != 0) { |
| // Expected version = 0, flags = 0. |
| return ERROR_MALFORMED; |
| } |
| |
| mNumSampleToChunkOffsets = U32_AT(&header[4]); |
| |
| if (data_size < 8 + mNumSampleToChunkOffsets * 12) { |
| return ERROR_MALFORMED; |
| } |
| |
| mSampleToChunkEntries = |
| new SampleToChunkEntry[mNumSampleToChunkOffsets]; |
| |
| for (uint32_t i = 0; i < mNumSampleToChunkOffsets; ++i) { |
| uint8_t buffer[12]; |
| if (mDataSource->readAt( |
| mSampleToChunkOffset + 8 + i * 12, buffer, sizeof(buffer)) |
| != (ssize_t)sizeof(buffer)) { |
| return ERROR_IO; |
| } |
| |
| CHECK(U32_AT(buffer) >= 1); // chunk index is 1 based in the spec. |
| |
| // We want the chunk index to be 0-based. |
| mSampleToChunkEntries[i].startChunk = U32_AT(buffer) - 1; |
| mSampleToChunkEntries[i].samplesPerChunk = U32_AT(&buffer[4]); |
| mSampleToChunkEntries[i].chunkDesc = U32_AT(&buffer[8]); |
| } |
| |
| return OK; |
| } |
| |
| status_t SampleTable::setSampleSizeParams( |
| uint32_t type, off_t data_offset, size_t data_size) { |
| if (mSampleSizeOffset >= 0) { |
| return ERROR_MALFORMED; |
| } |
| |
| CHECK(type == kSampleSizeType32 || type == kSampleSizeTypeCompact); |
| |
| mSampleSizeOffset = data_offset; |
| |
| if (data_size < 12) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t header[12]; |
| if (mDataSource->readAt( |
| data_offset, header, sizeof(header)) < (ssize_t)sizeof(header)) { |
| return ERROR_IO; |
| } |
| |
| if (U32_AT(header) != 0) { |
| // Expected version = 0, flags = 0. |
| return ERROR_MALFORMED; |
| } |
| |
| mDefaultSampleSize = U32_AT(&header[4]); |
| mNumSampleSizes = U32_AT(&header[8]); |
| |
| if (type == kSampleSizeType32) { |
| mSampleSizeFieldSize = 32; |
| |
| if (mDefaultSampleSize != 0) { |
| return OK; |
| } |
| |
| if (data_size < 12 + mNumSampleSizes * 4) { |
| return ERROR_MALFORMED; |
| } |
| } else { |
| if ((mDefaultSampleSize & 0xffffff00) != 0) { |
| // The high 24 bits are reserved and must be 0. |
| return ERROR_MALFORMED; |
| } |
| |
| mSampleSizeFieldSize = mDefaultSampleSize & 0xf; |
| mDefaultSampleSize = 0; |
| |
| if (mSampleSizeFieldSize != 4 && mSampleSizeFieldSize != 8 |
| && mSampleSizeFieldSize != 16) { |
| return ERROR_MALFORMED; |
| } |
| |
| if (data_size < 12 + (mNumSampleSizes * mSampleSizeFieldSize + 4) / 8) { |
| return ERROR_MALFORMED; |
| } |
| } |
| |
| return OK; |
| } |
| |
| status_t SampleTable::setTimeToSampleParams( |
| off_t data_offset, size_t data_size) { |
| if (mTimeToSample != NULL || data_size < 8) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t header[8]; |
| if (mDataSource->readAt( |
| data_offset, header, sizeof(header)) < (ssize_t)sizeof(header)) { |
| return ERROR_IO; |
| } |
| |
| if (U32_AT(header) != 0) { |
| // Expected version = 0, flags = 0. |
| return ERROR_MALFORMED; |
| } |
| |
| mTimeToSampleCount = U32_AT(&header[4]); |
| mTimeToSample = new uint32_t[mTimeToSampleCount * 2]; |
| |
| size_t size = sizeof(uint32_t) * mTimeToSampleCount * 2; |
| if (mDataSource->readAt( |
| data_offset + 8, mTimeToSample, size) < (ssize_t)size) { |
| return ERROR_IO; |
| } |
| |
| for (uint32_t i = 0; i < mTimeToSampleCount * 2; ++i) { |
| mTimeToSample[i] = ntohl(mTimeToSample[i]); |
| } |
| |
| return OK; |
| } |
| |
| status_t SampleTable::setSyncSampleParams(off_t data_offset, size_t data_size) { |
| if (mSyncSampleOffset >= 0 || data_size < 8) { |
| return ERROR_MALFORMED; |
| } |
| |
| mSyncSampleOffset = data_offset; |
| |
| uint8_t header[8]; |
| if (mDataSource->readAt( |
| data_offset, header, sizeof(header)) < (ssize_t)sizeof(header)) { |
| return ERROR_IO; |
| } |
| |
| if (U32_AT(header) != 0) { |
| // Expected version = 0, flags = 0. |
| return ERROR_MALFORMED; |
| } |
| |
| mNumSyncSamples = U32_AT(&header[4]); |
| |
| if (mNumSyncSamples < 2) { |
| LOGW("Table of sync samples is empty or has only a single entry!"); |
| } |
| return OK; |
| } |
| |
| uint32_t SampleTable::countChunkOffsets() const { |
| return mNumChunkOffsets; |
| } |
| |
| uint32_t SampleTable::countSamples() const { |
| return mNumSampleSizes; |
| } |
| |
| status_t SampleTable::getMaxSampleSize(size_t *max_size) { |
| Mutex::Autolock autoLock(mLock); |
| |
| *max_size = 0; |
| |
| for (uint32_t i = 0; i < mNumSampleSizes; ++i) { |
| size_t sample_size; |
| status_t err = getSampleSize_l(i, &sample_size); |
| |
| if (err != OK) { |
| return err; |
| } |
| |
| if (sample_size > *max_size) { |
| *max_size = sample_size; |
| } |
| } |
| |
| return OK; |
| } |
| |
| uint32_t abs_difference(uint32_t time1, uint32_t time2) { |
| return time1 > time2 ? time1 - time2 : time2 - time1; |
| } |
| |
| status_t SampleTable::findClosestSample( |
| uint32_t req_time, uint32_t *sample_index, uint32_t flags) { |
| Mutex::Autolock autoLock(mLock); |
| |
| uint32_t cur_sample = 0; |
| uint32_t time = 0; |
| for (uint32_t i = 0; i < mTimeToSampleCount; ++i) { |
| uint32_t n = mTimeToSample[2 * i]; |
| uint32_t delta = mTimeToSample[2 * i + 1]; |
| |
| if (req_time < time + n * delta) { |
| int j = (req_time - time) / delta; |
| |
| uint32_t time1 = time + j * delta; |
| uint32_t time2 = time1 + delta; |
| |
| if (i+1 == mTimeToSampleCount |
| || (abs_difference(req_time, time1) |
| < abs_difference(req_time, time2))) { |
| *sample_index = cur_sample + j; |
| } else { |
| *sample_index = cur_sample + j + 1; |
| } |
| |
| if (flags & kSyncSample_Flag) { |
| return findClosestSyncSample_l(*sample_index, sample_index); |
| } |
| |
| return OK; |
| } |
| |
| time += delta * n; |
| cur_sample += n; |
| } |
| |
| return ERROR_OUT_OF_RANGE; |
| } |
| |
| status_t SampleTable::findClosestSyncSample_l( |
| uint32_t start_sample_index, uint32_t *sample_index) { |
| *sample_index = 0; |
| |
| if (mSyncSampleOffset < 0) { |
| // All samples are sync-samples. |
| *sample_index = start_sample_index; |
| return OK; |
| } |
| |
| uint32_t x; |
| uint32_t left = 0; |
| uint32_t right = mNumSyncSamples; |
| while (left < right) { |
| uint32_t mid = (left + right) / 2; |
| |
| if (mDataSource->readAt( |
| mSyncSampleOffset + 8 + mid * 4, &x, 4) != 4) { |
| return ERROR_IO; |
| } |
| |
| x = ntohl(x); |
| |
| if (x < (start_sample_index + 1)) { |
| left = mid + 1; |
| } else if (x > (start_sample_index + 1)) { |
| right = mid; |
| } else { |
| break; |
| } |
| } |
| |
| *sample_index = x - 1; |
| |
| return OK; |
| } |
| |
| status_t SampleTable::findThumbnailSample(uint32_t *sample_index) { |
| Mutex::Autolock autoLock(mLock); |
| |
| if (mSyncSampleOffset < 0) { |
| // All samples are sync-samples. |
| *sample_index = 0; |
| return OK; |
| } |
| |
| uint32_t bestSampleIndex = 0; |
| size_t maxSampleSize = 0; |
| |
| static const size_t kMaxNumSyncSamplesToScan = 20; |
| |
| // Consider the first kMaxNumSyncSamplesToScan sync samples and |
| // pick the one with the largest (compressed) size as the thumbnail. |
| |
| size_t numSamplesToScan = mNumSyncSamples; |
| if (numSamplesToScan > kMaxNumSyncSamplesToScan) { |
| numSamplesToScan = kMaxNumSyncSamplesToScan; |
| } |
| |
| for (size_t i = 0; i < numSamplesToScan; ++i) { |
| uint32_t x; |
| if (mDataSource->readAt( |
| mSyncSampleOffset + 8 + i * 4, &x, 4) != 4) { |
| return ERROR_IO; |
| } |
| x = ntohl(x); |
| --x; |
| |
| // Now x is a sample index. |
| size_t sampleSize; |
| status_t err = getSampleSize_l(x, &sampleSize); |
| if (err != OK) { |
| return err; |
| } |
| |
| if (i == 0 || sampleSize > maxSampleSize) { |
| bestSampleIndex = x; |
| maxSampleSize = sampleSize; |
| } |
| } |
| |
| *sample_index = bestSampleIndex; |
| |
| return OK; |
| } |
| |
| status_t SampleTable::getSampleSize_l( |
| uint32_t sampleIndex, size_t *sampleSize) { |
| return mSampleIterator->getSampleSizeDirect( |
| sampleIndex, sampleSize); |
| } |
| |
| status_t SampleTable::getMetaDataForSample( |
| uint32_t sampleIndex, |
| off_t *offset, |
| size_t *size, |
| uint32_t *decodingTime) { |
| Mutex::Autolock autoLock(mLock); |
| |
| status_t err; |
| if ((err = mSampleIterator->seekTo(sampleIndex)) != OK) { |
| return err; |
| } |
| |
| if (offset) { |
| *offset = mSampleIterator->getSampleOffset(); |
| } |
| |
| if (size) { |
| *size = mSampleIterator->getSampleSize(); |
| } |
| |
| if (decodingTime) { |
| *decodingTime = mSampleIterator->getSampleTime(); |
| } |
| |
| return OK; |
| } |
| |
| } // namespace android |
| |