| /* |
| * Copyright 2015 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 "CallbackDataSource" |
| #include <utils/Log.h> |
| |
| #include "include/CallbackDataSource.h" |
| |
| #include <binder/IMemory.h> |
| #include <media/IDataSource.h> |
| #include <media/stagefright/foundation/ADebug.h> |
| |
| #include <algorithm> |
| |
| namespace android { |
| |
| CallbackDataSource::CallbackDataSource( |
| const sp<IDataSource>& binderDataSource) |
| : mIDataSource(binderDataSource), |
| mIsClosed(false) { |
| // Set up the buffer to read into. |
| mMemory = mIDataSource->getIMemory(); |
| mName = String8::format("CallbackDataSource(%s)", mIDataSource->toString().string()); |
| |
| } |
| |
| CallbackDataSource::~CallbackDataSource() { |
| ALOGV("~CallbackDataSource"); |
| close(); |
| } |
| |
| status_t CallbackDataSource::initCheck() const { |
| if (mMemory == NULL) { |
| return UNKNOWN_ERROR; |
| } |
| return OK; |
| } |
| |
| ssize_t CallbackDataSource::readAt(off64_t offset, void* data, size_t size) { |
| if (mMemory == NULL || data == NULL) { |
| return -1; |
| } |
| |
| // IDataSource can only read up to mMemory->size() bytes at a time, but this |
| // method should be able to read any number of bytes, so read in a loop. |
| size_t totalNumRead = 0; |
| size_t numLeft = size; |
| const size_t bufferSize = mMemory->size(); |
| |
| while (numLeft > 0) { |
| size_t numToRead = std::min(numLeft, bufferSize); |
| ssize_t numRead = |
| mIDataSource->readAt(offset + totalNumRead, numToRead); |
| // A negative return value represents an error. Pass it on. |
| if (numRead < 0) { |
| return numRead == ERROR_END_OF_STREAM && totalNumRead > 0 ? totalNumRead : numRead; |
| } |
| // A zero return value signals EOS. Return the bytes read so far. |
| if (numRead == 0) { |
| return totalNumRead; |
| } |
| if ((size_t)numRead > numToRead) { |
| return ERROR_OUT_OF_RANGE; |
| } |
| CHECK(numRead >= 0 && (size_t)numRead <= bufferSize); |
| memcpy(((uint8_t*)data) + totalNumRead, mMemory->pointer(), numRead); |
| numLeft -= numRead; |
| totalNumRead += numRead; |
| } |
| |
| return totalNumRead; |
| } |
| |
| status_t CallbackDataSource::getSize(off64_t *size) { |
| status_t err = mIDataSource->getSize(size); |
| if (err != OK) { |
| return err; |
| } |
| if (*size < 0) { |
| // IDataSource will set size to -1 to indicate unknown size, but |
| // DataSource returns ERROR_UNSUPPORTED for that. |
| return ERROR_UNSUPPORTED; |
| } |
| return OK; |
| } |
| |
| uint32_t CallbackDataSource::flags() { |
| return mIDataSource->getFlags(); |
| } |
| |
| void CallbackDataSource::close() { |
| if (!mIsClosed) { |
| mIDataSource->close(); |
| mIsClosed = true; |
| } |
| } |
| |
| sp<DecryptHandle> CallbackDataSource::DrmInitialization(const char *mime) { |
| return mIDataSource->DrmInitialization(mime); |
| } |
| |
| sp<IDataSource> CallbackDataSource::getIDataSource() const { |
| return mIDataSource; |
| } |
| |
| TinyCacheSource::TinyCacheSource(const sp<DataSource>& source) |
| : mSource(source), mCachedOffset(0), mCachedSize(0) { |
| mName = String8::format("TinyCacheSource(%s)", mSource->toString().string()); |
| } |
| |
| status_t TinyCacheSource::initCheck() const { |
| return mSource->initCheck(); |
| } |
| |
| ssize_t TinyCacheSource::readAt(off64_t offset, void* data, size_t size) { |
| // Check if the cache satisfies the read. |
| if (mCachedOffset <= offset |
| && offset < (off64_t) (mCachedOffset + mCachedSize)) { |
| if (offset + size <= mCachedOffset + mCachedSize) { |
| memcpy(data, &mCache[offset - mCachedOffset], size); |
| return size; |
| } else { |
| // If the cache hits only partially, flush the cache and read the |
| // remainder. |
| |
| // This value is guaranteed to be greater than 0 because of the |
| // enclosing if statement. |
| const ssize_t remaining = mCachedOffset + mCachedSize - offset; |
| memcpy(data, &mCache[offset - mCachedOffset], remaining); |
| const ssize_t readMore = readAt(offset + remaining, |
| (uint8_t*)data + remaining, size - remaining); |
| if (readMore < 0) { |
| return readMore; |
| } |
| return remaining + readMore; |
| } |
| } |
| |
| if (size >= kCacheSize) { |
| return mSource->readAt(offset, data, size); |
| } |
| |
| // Fill the cache and copy to the caller. |
| const ssize_t numRead = mSource->readAt(offset, mCache, kCacheSize); |
| if (numRead <= 0) { |
| // Flush cache on error |
| mCachedSize = 0; |
| mCachedOffset = 0; |
| return numRead; |
| } |
| if ((size_t)numRead > kCacheSize) { |
| // Flush cache on error |
| mCachedSize = 0; |
| mCachedOffset = 0; |
| return ERROR_OUT_OF_RANGE; |
| } |
| |
| mCachedSize = numRead; |
| mCachedOffset = offset; |
| CHECK(mCachedSize <= kCacheSize && mCachedOffset >= 0); |
| const size_t numToReturn = std::min(size, (size_t)numRead); |
| memcpy(data, mCache, numToReturn); |
| |
| return numToReturn; |
| } |
| |
| status_t TinyCacheSource::getSize(off64_t *size) { |
| return mSource->getSize(size); |
| } |
| |
| uint32_t TinyCacheSource::flags() { |
| return mSource->flags(); |
| } |
| |
| sp<DecryptHandle> TinyCacheSource::DrmInitialization(const char *mime) { |
| // flush cache when DrmInitialization occurs since decrypted |
| // data may differ from what is in cache. |
| mCachedOffset = 0; |
| mCachedSize = 0; |
| return mSource->DrmInitialization(mime); |
| } |
| |
| sp<IDataSource> TinyCacheSource::getIDataSource() const { |
| return mSource->getIDataSource(); |
| } |
| |
| } // namespace android |