FileSource.cpp revision d066bc8faf68b9fcb034ceb203e8d7e8213dc1ce 
1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "FileSource"
19#include <utils/Log.h>
20
21#include <media/stagefright/foundation/ADebug.h>
22#include <media/stagefright/FileSource.h>
23#include <sys/types.h>
24#include <unistd.h>
25#include <sys/types.h>
26#include <sys/stat.h>
27#include <fcntl.h>
28
29namespace android {
30
31FileSource::FileSource(const char *filename)
32    : mFd(-1),
33      mOffset(0),
34      mLength(-1),
35      mDecryptHandle(NULL),
36      mDrmManagerClient(NULL),
37      mDrmBufOffset(0),
38      mDrmBufSize(0),
39      mDrmBuf(NULL){
40
41    mFd = open(filename, O_LARGEFILE | O_RDONLY);
42
43    if (mFd >= 0) {
44        mLength = lseek64(mFd, 0, SEEK_END);
45    } else {
46        ALOGE("Failed to open file '%s'. (%s)", filename, strerror(errno));
47    }
48}
49
50FileSource::FileSource(int fd, int64_t offset, int64_t length)
51    : mFd(fd),
52      mOffset(offset),
53      mLength(length),
54      mDecryptHandle(NULL),
55      mDrmManagerClient(NULL),
56      mDrmBufOffset(0),
57      mDrmBufSize(0),
58      mDrmBuf(NULL){
59    CHECK(offset >= 0);
60    CHECK(length >= 0);
61}
62
63FileSource::~FileSource() {
64    if (mFd >= 0) {
65        close(mFd);
66        mFd = -1;
67    }
68
69    if (mDrmBuf != NULL) {
70        delete[] mDrmBuf;
71        mDrmBuf = NULL;
72    }
73
74    if (mDecryptHandle != NULL) {
75        // To release mDecryptHandle
76        CHECK(mDrmManagerClient);
77        mDrmManagerClient->closeDecryptSession(mDecryptHandle);
78        mDecryptHandle = NULL;
79    }
80
81    if (mDrmManagerClient != NULL) {
82        delete mDrmManagerClient;
83        mDrmManagerClient = NULL;
84    }
85}
86
87status_t FileSource::initCheck() const {
88    return mFd >= 0 ? OK : NO_INIT;
89}
90
91ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
92    if (mFd < 0) {
93        return NO_INIT;
94    }
95
96    Mutex::Autolock autoLock(mLock);
97
98    if (mLength >= 0) {
99        if (offset >= mLength) {
100            return 0;  // read beyond EOF.
101        }
102        int64_t numAvailable = mLength - offset;
103        if ((int64_t)size > numAvailable) {
104            size = numAvailable;
105        }
106    }
107
108    if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
109            == mDecryptHandle->decryptApiType) {
110        return readAtDRM(offset, data, size);
111   } else {
112        off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
113        if (result == -1) {
114            ALOGE("seek to %lld failed", (long long)(offset + mOffset));
115            return UNKNOWN_ERROR;
116        }
117
118        return ::read(mFd, data, size);
119    }
120}
121
122status_t FileSource::getSize(off64_t *size) {
123    Mutex::Autolock autoLock(mLock);
124
125    if (mFd < 0) {
126        return NO_INIT;
127    }
128
129    *size = mLength;
130
131    return OK;
132}
133
134sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
135    if (mDrmManagerClient == NULL) {
136        mDrmManagerClient = new DrmManagerClient();
137    }
138
139    if (mDrmManagerClient == NULL) {
140        return NULL;
141    }
142
143    if (mDecryptHandle == NULL) {
144        mDecryptHandle = mDrmManagerClient->openDecryptSession(
145                mFd, mOffset, mLength, mime);
146    }
147
148    if (mDecryptHandle == NULL) {
149        delete mDrmManagerClient;
150        mDrmManagerClient = NULL;
151    }
152
153    return mDecryptHandle;
154}
155
156void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
157    handle = mDecryptHandle;
158
159    *client = mDrmManagerClient;
160}
161
162ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) {
163    size_t DRM_CACHE_SIZE = 1024;
164    if (mDrmBuf == NULL) {
165        mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
166    }
167
168    if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
169            && (offset + mOffset + size) <= static_cast<size_t>(mDrmBufOffset + mDrmBufSize)) {
170        /* Use buffered data */
171        memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
172        return size;
173    } else if (size <= DRM_CACHE_SIZE) {
174        /* Buffer new data */
175        mDrmBufOffset =  offset + mOffset;
176        mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
177                DRM_CACHE_SIZE, offset + mOffset);
178        if (mDrmBufSize > 0) {
179            int64_t dataRead = 0;
180            dataRead = size > static_cast<size_t>(mDrmBufSize) ? mDrmBufSize : size;
181            memcpy(data, (void*)mDrmBuf, dataRead);
182            return dataRead;
183        } else {
184            return mDrmBufSize;
185        }
186    } else {
187        /* Too big chunk to cache. Call DRM directly */
188        return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
189    }
190}
191}  // namespace android
192