FileSource.cpp revision 4ee31e2603b4019e4ae76e027115f80b818527aa 
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/foundation/ADebug.h>
18#include <media/stagefright/FileSource.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    if (mFd >= 0) {
40        mLength = lseek64(mFd, 0, SEEK_END);
41    }
42}
43
44FileSource::FileSource(int fd, int64_t offset, int64_t length)
45    : mFd(fd),
46      mOffset(offset),
47      mLength(length),
48      mDecryptHandle(NULL),
49      mDrmManagerClient(NULL),
50      mDrmBufOffset(0),
51      mDrmBufSize(0),
52      mDrmBuf(NULL){
53    CHECK(offset >= 0);
54    CHECK(length >= 0);
55}
56
57FileSource::~FileSource() {
58    if (mFd >= 0) {
59        close(mFd);
60        mFd = -1;
61    }
62
63    if (mDrmBuf != NULL) {
64        delete[] mDrmBuf;
65        mDrmBuf = NULL;
66    }
67
68    if (mDecryptHandle != NULL) {
69        // To release mDecryptHandle
70        CHECK(mDrmManagerClient);
71        mDrmManagerClient->closeDecryptSession(mDecryptHandle);
72        mDecryptHandle = NULL;
73    }
74
75    if (mDrmManagerClient != NULL) {
76        delete mDrmManagerClient;
77        mDrmManagerClient = NULL;
78    }
79}
80
81status_t FileSource::initCheck() const {
82    return mFd >= 0 ? OK : NO_INIT;
83}
84
85ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
86    if (mFd < 0) {
87        return NO_INIT;
88    }
89
90    Mutex::Autolock autoLock(mLock);
91
92    if (mLength >= 0) {
93        if (offset >= mLength) {
94            return 0;  // read beyond EOF.
95        }
96        int64_t numAvailable = mLength - offset;
97        if ((int64_t)size > numAvailable) {
98            size = numAvailable;
99        }
100    }
101
102    if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
103            == mDecryptHandle->decryptApiType) {
104        return readAtDRM(offset, data, size);
105   } else {
106        off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
107        if (result == -1) {
108            ALOGE("seek to %lld failed", offset + mOffset);
109            return UNKNOWN_ERROR;
110        }
111
112        return ::read(mFd, data, size);
113    }
114}
115
116status_t FileSource::getSize(off64_t *size) {
117    Mutex::Autolock autoLock(mLock);
118
119    if (mFd < 0) {
120        return NO_INIT;
121    }
122
123    *size = mLength;
124
125    return OK;
126}
127
128sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
129    if (mDrmManagerClient == NULL) {
130        mDrmManagerClient = new DrmManagerClient();
131    }
132
133    if (mDrmManagerClient == NULL) {
134        return NULL;
135    }
136
137    if (mDecryptHandle == NULL) {
138        mDecryptHandle = mDrmManagerClient->openDecryptSession(
139                mFd, mOffset, mLength, mime);
140    }
141
142    if (mDecryptHandle == NULL) {
143        delete mDrmManagerClient;
144        mDrmManagerClient = NULL;
145    }
146
147    return mDecryptHandle;
148}
149
150void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
151    handle = mDecryptHandle;
152
153    *client = mDrmManagerClient;
154}
155
156ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) {
157    size_t DRM_CACHE_SIZE = 1024;
158    if (mDrmBuf == NULL) {
159        mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
160    }
161
162    if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
163            && (offset + mOffset + size) <= (mDrmBufOffset + mDrmBufSize)) {
164        /* Use buffered data */
165        memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
166        return size;
167    } else if (size <= DRM_CACHE_SIZE) {
168        /* Buffer new data */
169        mDrmBufOffset =  offset + mOffset;
170        mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
171                DRM_CACHE_SIZE, offset + mOffset);
172        if (mDrmBufSize > 0) {
173            int64_t dataRead = 0;
174            dataRead = size > mDrmBufSize ? mDrmBufSize : size;
175            memcpy(data, (void*)mDrmBuf, dataRead);
176            return dataRead;
177        } else {
178            return mDrmBufSize;
179        }
180    } else {
181        /* Too big chunk to cache. Call DRM directly */
182        return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
183    }
184}
185}  // namespace android
186