IHDCP.cpp revision ec3acca4a75fc4adc076b56751124f507b419622
1/*
2 * Copyright (C) 2012 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 "IHDCP"
19#include <utils/Log.h>
20
21#include <binder/Parcel.h>
22#include <media/IHDCP.h>
23#include <media/stagefright/MediaErrors.h>
24#include <media/stagefright/foundation/ADebug.h>
25
26namespace android {
27
28enum {
29    OBSERVER_NOTIFY = IBinder::FIRST_CALL_TRANSACTION,
30    HDCP_SET_OBSERVER,
31    HDCP_INIT_ASYNC,
32    HDCP_SHUTDOWN_ASYNC,
33    HDCP_GET_CAPS,
34    HDCP_ENCRYPT,
35    HDCP_ENCRYPT_NATIVE,
36    HDCP_DECRYPT,
37};
38
39struct BpHDCPObserver : public BpInterface<IHDCPObserver> {
40    BpHDCPObserver(const sp<IBinder> &impl)
41        : BpInterface<IHDCPObserver>(impl) {
42    }
43
44    virtual void notify(
45            int msg, int ext1, int ext2, const Parcel *obj) {
46        Parcel data, reply;
47        data.writeInterfaceToken(IHDCPObserver::getInterfaceDescriptor());
48        data.writeInt32(msg);
49        data.writeInt32(ext1);
50        data.writeInt32(ext2);
51        if (obj && obj->dataSize() > 0) {
52            data.appendFrom(const_cast<Parcel *>(obj), 0, obj->dataSize());
53        }
54        remote()->transact(OBSERVER_NOTIFY, data, &reply, IBinder::FLAG_ONEWAY);
55    }
56};
57
58IMPLEMENT_META_INTERFACE(HDCPObserver, "android.hardware.IHDCPObserver");
59
60struct BpHDCP : public BpInterface<IHDCP> {
61    BpHDCP(const sp<IBinder> &impl)
62        : BpInterface<IHDCP>(impl) {
63    }
64
65    virtual status_t setObserver(const sp<IHDCPObserver> &observer) {
66        Parcel data, reply;
67        data.writeInterfaceToken(IHDCP::getInterfaceDescriptor());
68        data.writeStrongBinder(observer->asBinder());
69        remote()->transact(HDCP_SET_OBSERVER, data, &reply);
70        return reply.readInt32();
71    }
72
73    virtual status_t initAsync(const char *host, unsigned port) {
74        Parcel data, reply;
75        data.writeInterfaceToken(IHDCP::getInterfaceDescriptor());
76        data.writeCString(host);
77        data.writeInt32(port);
78        remote()->transact(HDCP_INIT_ASYNC, data, &reply);
79        return reply.readInt32();
80    }
81
82    virtual status_t shutdownAsync() {
83        Parcel data, reply;
84        data.writeInterfaceToken(IHDCP::getInterfaceDescriptor());
85        remote()->transact(HDCP_SHUTDOWN_ASYNC, data, &reply);
86        return reply.readInt32();
87    }
88
89    virtual uint32_t getCaps() {
90        Parcel data, reply;
91        data.writeInterfaceToken(IHDCP::getInterfaceDescriptor());
92        remote()->transact(HDCP_GET_CAPS, data, &reply);
93        return reply.readInt32();
94    }
95
96    virtual status_t encrypt(
97            const void *inData, size_t size, uint32_t streamCTR,
98            uint64_t *outInputCTR, void *outData) {
99        Parcel data, reply;
100        data.writeInterfaceToken(IHDCP::getInterfaceDescriptor());
101        data.writeInt32(size);
102        data.write(inData, size);
103        data.writeInt32(streamCTR);
104        remote()->transact(HDCP_ENCRYPT, data, &reply);
105
106        status_t err = reply.readInt32();
107
108        if (err != OK) {
109            *outInputCTR = 0;
110
111            return err;
112        }
113
114        *outInputCTR = reply.readInt64();
115        reply.read(outData, size);
116
117        return err;
118    }
119
120    virtual status_t encryptNative(
121            const sp<GraphicBuffer> &graphicBuffer,
122            size_t offset, size_t size, uint32_t streamCTR,
123            uint64_t *outInputCTR, void *outData) {
124        Parcel data, reply;
125        data.writeInterfaceToken(IHDCP::getInterfaceDescriptor());
126        data.write(*graphicBuffer);
127        data.writeInt32(offset);
128        data.writeInt32(size);
129        data.writeInt32(streamCTR);
130        remote()->transact(HDCP_ENCRYPT_NATIVE, data, &reply);
131
132        status_t err = reply.readInt32();
133
134        if (err != OK) {
135            *outInputCTR = 0;
136            return err;
137        }
138
139        *outInputCTR = reply.readInt64();
140        reply.read(outData, size);
141
142        return err;
143    }
144
145    virtual status_t decrypt(
146            const void *inData, size_t size,
147            uint32_t streamCTR, uint64_t inputCTR,
148            void *outData) {
149        Parcel data, reply;
150        data.writeInterfaceToken(IHDCP::getInterfaceDescriptor());
151        data.writeInt32(size);
152        data.write(inData, size);
153        data.writeInt32(streamCTR);
154        data.writeInt64(inputCTR);
155        remote()->transact(HDCP_DECRYPT, data, &reply);
156
157        status_t err = reply.readInt32();
158
159        if (err != OK) {
160            return err;
161        }
162
163        reply.read(outData, size);
164
165        return err;
166    }
167};
168
169IMPLEMENT_META_INTERFACE(HDCP, "android.hardware.IHDCP");
170
171status_t BnHDCPObserver::onTransact(
172        uint32_t code, const Parcel &data, Parcel *reply, uint32_t flags) {
173    switch (code) {
174        case OBSERVER_NOTIFY:
175        {
176            CHECK_INTERFACE(IHDCPObserver, data, reply);
177
178            int msg = data.readInt32();
179            int ext1 = data.readInt32();
180            int ext2 = data.readInt32();
181
182            Parcel obj;
183            if (data.dataAvail() > 0) {
184                obj.appendFrom(
185                        const_cast<Parcel *>(&data),
186                        data.dataPosition(),
187                        data.dataAvail());
188            }
189
190            notify(msg, ext1, ext2, &obj);
191
192            return OK;
193        }
194
195        default:
196            return BBinder::onTransact(code, data, reply, flags);
197    }
198}
199
200status_t BnHDCP::onTransact(
201        uint32_t code, const Parcel &data, Parcel *reply, uint32_t flags) {
202    switch (code) {
203        case HDCP_SET_OBSERVER:
204        {
205            CHECK_INTERFACE(IHDCP, data, reply);
206
207            sp<IHDCPObserver> observer =
208                interface_cast<IHDCPObserver>(data.readStrongBinder());
209
210            reply->writeInt32(setObserver(observer));
211            return OK;
212        }
213
214        case HDCP_INIT_ASYNC:
215        {
216            CHECK_INTERFACE(IHDCP, data, reply);
217
218            const char *host = data.readCString();
219            unsigned port = data.readInt32();
220
221            reply->writeInt32(initAsync(host, port));
222            return OK;
223        }
224
225        case HDCP_SHUTDOWN_ASYNC:
226        {
227            CHECK_INTERFACE(IHDCP, data, reply);
228
229            reply->writeInt32(shutdownAsync());
230            return OK;
231        }
232
233        case HDCP_GET_CAPS:
234        {
235            CHECK_INTERFACE(IHDCP, data, reply);
236
237            reply->writeInt32(getCaps());
238            return OK;
239        }
240
241        case HDCP_ENCRYPT:
242        {
243            size_t size = data.readInt32();
244
245            void *inData = malloc(2 * size);
246            void *outData = (uint8_t *)inData + size;
247
248            data.read(inData, size);
249
250            uint32_t streamCTR = data.readInt32();
251            uint64_t inputCTR;
252            status_t err = encrypt(inData, size, streamCTR, &inputCTR, outData);
253
254            reply->writeInt32(err);
255
256            if (err == OK) {
257                reply->writeInt64(inputCTR);
258                reply->write(outData, size);
259            }
260
261            free(inData);
262            inData = outData = NULL;
263
264            return OK;
265        }
266
267        case HDCP_ENCRYPT_NATIVE:
268        {
269            CHECK_INTERFACE(IHDCP, data, reply);
270
271            sp<GraphicBuffer> graphicBuffer = new GraphicBuffer();
272            data.read(*graphicBuffer);
273            size_t offset = data.readInt32();
274            size_t size = data.readInt32();
275            uint32_t streamCTR = data.readInt32();
276            void *outData = malloc(size);
277            uint64_t inputCTR;
278
279            status_t err = encryptNative(graphicBuffer, offset, size,
280                                         streamCTR, &inputCTR, outData);
281
282            reply->writeInt32(err);
283
284            if (err == OK) {
285                reply->writeInt64(inputCTR);
286                reply->write(outData, size);
287            }
288
289            free(outData);
290            outData = NULL;
291
292            return OK;
293        }
294
295        case HDCP_DECRYPT:
296        {
297            size_t size = data.readInt32();
298
299            void *inData = malloc(2 * size);
300            void *outData = (uint8_t *)inData + size;
301
302            data.read(inData, size);
303
304            uint32_t streamCTR = data.readInt32();
305            uint64_t inputCTR = data.readInt64();
306            status_t err = decrypt(inData, size, streamCTR, inputCTR, outData);
307
308            reply->writeInt32(err);
309
310            if (err == OK) {
311                reply->write(outData, size);
312            }
313
314            free(inData);
315            inData = outData = NULL;
316
317            return OK;
318        }
319
320        default:
321            return BBinder::onTransact(code, data, reply, flags);
322    }
323}
324
325}  // namespace android
326