FileSource.cpp revision 83b0fd9997b558f6c2ebf5e6e4db20570cb233b8 
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 <media/stagefright/Utils.h>
24#include <sys/types.h>
25#include <unistd.h>
26#include <sys/types.h>
27#include <sys/stat.h>
28#include <fcntl.h>
29
30namespace android {
31
32FileSource::FileSource(const char *filename)
33    : mFd(-1),
34      mOffset(0),
35      mLength(-1),
36      mDecryptHandle(NULL),
37      mDrmManagerClient(NULL),
38      mDrmBufOffset(0),
39      mDrmBufSize(0),
40      mDrmBuf(NULL){
41
42    ALOGV("%s", filename);
43    mFd = open(filename, O_LARGEFILE | O_RDONLY);
44
45    if (mFd >= 0) {
46        mLength = lseek64(mFd, 0, SEEK_END);
47    } else {
48        ALOGE("Failed to open file '%s'. (%s)", filename, strerror(errno));
49    }
50}
51
52FileSource::FileSource(int fd, int64_t offset, int64_t length)
53    : mFd(fd),
54      mOffset(offset),
55      mLength(length),
56      mDecryptHandle(NULL),
57      mDrmManagerClient(NULL),
58      mDrmBufOffset(0),
59      mDrmBufSize(0),
60      mDrmBuf(NULL){
61    ALOGV("fd=%d (%s), offset=%lld, length=%lld",
62            fd, nameForFd(fd).c_str(), (long long) offset, (long long) length);
63
64    CHECK(offset >= 0);
65    CHECK(length >= 0);
66}
67
68FileSource::~FileSource() {
69    if (mFd >= 0) {
70        close(mFd);
71        mFd = -1;
72    }
73
74    if (mDrmBuf != NULL) {
75        delete[] mDrmBuf;
76        mDrmBuf = NULL;
77    }
78
79    if (mDecryptHandle != NULL) {
80        // To release mDecryptHandle
81        CHECK(mDrmManagerClient);
82        mDrmManagerClient->closeDecryptSession(mDecryptHandle);
83        mDecryptHandle = NULL;
84    }
85
86    if (mDrmManagerClient != NULL) {
87        delete mDrmManagerClient;
88        mDrmManagerClient = NULL;
89    }
90}
91
92status_t FileSource::initCheck() const {
93    return mFd >= 0 ? OK : NO_INIT;
94}
95
96ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
97    if (mFd < 0) {
98        return NO_INIT;
99    }
100
101    Mutex::Autolock autoLock(mLock);
102
103    if (mLength >= 0) {
104        if (offset >= mLength) {
105            return 0;  // read beyond EOF.
106        }
107        uint64_t numAvailable = mLength - offset;
108        if ((uint64_t)size > numAvailable) {
109            size = numAvailable;
110        }
111    }
112
113    if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
114            == mDecryptHandle->decryptApiType) {
115        return readAtDRM(offset, data, size);
116   } else {
117        off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
118        if (result == -1) {
119            ALOGE("seek to %lld failed", (long long)(offset + mOffset));
120            return UNKNOWN_ERROR;
121        }
122
123        return ::read(mFd, data, size);
124    }
125}
126
127status_t FileSource::getSize(off64_t *size) {
128    Mutex::Autolock autoLock(mLock);
129
130    if (mFd < 0) {
131        return NO_INIT;
132    }
133
134    *size = mLength;
135
136    return OK;
137}
138
139sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
140    if (mDrmManagerClient == NULL) {
141        mDrmManagerClient = new DrmManagerClient();
142    }
143
144    if (mDrmManagerClient == NULL) {
145        return NULL;
146    }
147
148    if (mDecryptHandle == NULL) {
149        mDecryptHandle = mDrmManagerClient->openDecryptSession(
150                mFd, mOffset, mLength, mime);
151    }
152
153    if (mDecryptHandle == NULL) {
154        delete mDrmManagerClient;
155        mDrmManagerClient = NULL;
156    }
157
158    return mDecryptHandle;
159}
160
161void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
162    handle = mDecryptHandle;
163
164    *client = mDrmManagerClient;
165}
166
167ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) {
168    size_t DRM_CACHE_SIZE = 1024;
169    if (mDrmBuf == NULL) {
170        mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
171    }
172
173    if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
174            && (offset + mOffset + size) <= (mDrmBufOffset + mDrmBufSize)) {
175        /* Use buffered data */
176        memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
177        return size;
178    } else if (size <= DRM_CACHE_SIZE) {
179        /* Buffer new data */
180        mDrmBufOffset =  offset + mOffset;
181        mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
182                DRM_CACHE_SIZE, offset + mOffset);
183        if (mDrmBufSize > 0) {
184            int64_t dataRead = 0;
185            dataRead = size > mDrmBufSize ? mDrmBufSize : size;
186            memcpy(data, (void*)mDrmBuf, dataRead);
187            return dataRead;
188        } else {
189            return mDrmBufSize;
190        }
191    } else {
192        /* Too big chunk to cache. Call DRM directly */
193        return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
194    }
195}
196}  // namespace android
197