FileSource.cpp revision 29357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47 
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#include <media/stagefright/FileSource.h>
18#include <media/stagefright/MediaDebug.h>
19#include <sys/types.h>
20#include <unistd.h>
21#include <sys/types.h>
22#include <sys/stat.h>
23#include <fcntl.h>
24
25namespace android {
26
27FileSource::FileSource(const char *filename)
28    : mFd(-1),
29      mOffset(0),
30      mLength(-1),
31      mDecryptHandle(NULL),
32      mDrmManagerClient(NULL),
33      mDrmBufOffset(0),
34      mDrmBufSize(0),
35      mDrmBuf(NULL){
36
37    mFd = open(filename, O_LARGEFILE | O_RDONLY);
38}
39
40FileSource::FileSource(int fd, int64_t offset, int64_t length)
41    : mFd(fd),
42      mOffset(offset),
43      mLength(length),
44      mDecryptHandle(NULL),
45      mDrmManagerClient(NULL),
46      mDrmBufOffset(0),
47      mDrmBufSize(0),
48      mDrmBuf(NULL){
49    CHECK(offset >= 0);
50    CHECK(length >= 0);
51}
52
53FileSource::~FileSource() {
54    if (mFd >= 0) {
55        close(mFd);
56        mFd = -1;
57    }
58
59    if (mDrmBuf != NULL) {
60        delete[] mDrmBuf;
61        mDrmBuf = NULL;
62    }
63
64    if (mDecryptHandle != NULL) {
65        // To release mDecryptHandle
66        CHECK(mDrmManagerClient);
67        mDrmManagerClient->closeDecryptSession(mDecryptHandle);
68        mDecryptHandle = NULL;
69    }
70
71    if (mDrmManagerClient != NULL) {
72        delete mDrmManagerClient;
73        mDrmManagerClient = NULL;
74    }
75}
76
77status_t FileSource::initCheck() const {
78    return mFd >= 0 ? OK : NO_INIT;
79}
80
81ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
82    if (mFd < 0) {
83        return NO_INIT;
84    }
85
86    Mutex::Autolock autoLock(mLock);
87
88    if (mLength >= 0) {
89        if (offset >= mLength) {
90            return 0;  // read beyond EOF.
91        }
92        int64_t numAvailable = mLength - offset;
93        if ((int64_t)size > numAvailable) {
94            size = numAvailable;
95        }
96    }
97
98    if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
99            == mDecryptHandle->decryptApiType) {
100        return readAtDRM(offset, data, size);
101   } else {
102        off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
103        if (result == -1) {
104            ALOGE("seek to %lld failed", offset + mOffset);
105            return UNKNOWN_ERROR;
106        }
107
108        return ::read(mFd, data, size);
109    }
110}
111
112status_t FileSource::getSize(off64_t *size) {
113    Mutex::Autolock autoLock(mLock);
114
115    if (mFd < 0) {
116        return NO_INIT;
117    }
118
119    if (mLength >= 0) {
120        *size = mLength;
121
122        return OK;
123    }
124
125    *size = lseek64(mFd, 0, SEEK_END);
126
127    return OK;
128}
129
130sp<DecryptHandle> FileSource::DrmInitialization() {
131    if (mDrmManagerClient == NULL) {
132        mDrmManagerClient = new DrmManagerClient();
133    }
134
135    if (mDrmManagerClient == NULL) {
136        return NULL;
137    }
138
139    if (mDecryptHandle == NULL) {
140        mDecryptHandle = mDrmManagerClient->openDecryptSession(
141                mFd, mOffset, mLength);
142    }
143
144    if (mDecryptHandle == NULL) {
145        delete mDrmManagerClient;
146        mDrmManagerClient = NULL;
147    }
148
149    return mDecryptHandle;
150}
151
152void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
153    handle = mDecryptHandle;
154
155    *client = mDrmManagerClient;
156}
157
158ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) {
159    size_t DRM_CACHE_SIZE = 1024;
160    if (mDrmBuf == NULL) {
161        mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
162    }
163
164    if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
165            && (offset + mOffset + size) <= (mDrmBufOffset + mDrmBufSize)) {
166        /* Use buffered data */
167        memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
168        return size;
169    } else if (size <= DRM_CACHE_SIZE) {
170        /* Buffer new data */
171        mDrmBufOffset =  offset + mOffset;
172        mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
173                DRM_CACHE_SIZE, offset + mOffset);
174        if (mDrmBufSize > 0) {
175            int64_t dataRead = 0;
176            dataRead = size > mDrmBufSize ? mDrmBufSize : size;
177            memcpy(data, (void*)mDrmBuf, dataRead);
178            return dataRead;
179        } else {
180            return mDrmBufSize;
181        }
182    } else {
183        /* Too big chunk to cache. Call DRM directly */
184        return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
185    }
186}
187}  // namespace android
188