NdkMediaExtractor.cpp revision 58344bc9165a9465a63acc874f3e71251a0d7f50 
1/*
2 * Copyright (C) 2014 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 "NdkMediaExtractor"
19
20
21#include "NdkMediaError.h"
22#include "NdkMediaExtractor.h"
23#include "NdkMediaFormatPriv.h"
24
25
26#include <utils/Log.h>
27#include <utils/StrongPointer.h>
28#include <media/hardware/CryptoAPI.h>
29#include <media/stagefright/foundation/ABuffer.h>
30#include <media/stagefright/foundation/AMessage.h>
31#include <media/stagefright/MetaData.h>
32#include <media/stagefright/NuMediaExtractor.h>
33#include <media/IMediaHTTPService.h>
34#include <android_runtime/AndroidRuntime.h>
35#include <android_util_Binder.h>
36
37#include <jni.h>
38
39using namespace android;
40
41static media_status_t translate_error(status_t err) {
42    if (err == OK) {
43        return AMEDIA_OK;
44    }
45    ALOGE("sf error code: %d", err);
46    return AMEDIA_ERROR_UNKNOWN;
47}
48
49struct AMediaExtractor {
50    sp<NuMediaExtractor> mImpl;
51    sp<ABuffer> mPsshBuf;
52
53};
54
55extern "C" {
56
57EXPORT
58AMediaExtractor* AMediaExtractor_new() {
59    ALOGV("ctor");
60    AMediaExtractor *mData = new AMediaExtractor();
61    mData->mImpl = new NuMediaExtractor();
62    return mData;
63}
64
65EXPORT
66media_status_t AMediaExtractor_delete(AMediaExtractor *mData) {
67    ALOGV("dtor");
68    delete mData;
69    return AMEDIA_OK;
70}
71
72EXPORT
73media_status_t AMediaExtractor_setDataSourceFd(AMediaExtractor *mData, int fd, off64_t offset, off64_t length) {
74    ALOGV("setDataSource(%d, %lld, %lld)", fd, offset, length);
75    return translate_error(mData->mImpl->setDataSource(fd, offset, length));
76}
77
78EXPORT
79media_status_t AMediaExtractor_setDataSource(AMediaExtractor *mData, const char *location) {
80    ALOGV("setDataSource(%s)", location);
81    // TODO: add header support
82
83    JNIEnv *env = AndroidRuntime::getJNIEnv();
84    jobject service = NULL;
85    if (env == NULL) {
86        ALOGE("setDataSource(path) must be called from Java thread");
87        env->ExceptionClear();
88        return AMEDIA_ERROR_UNSUPPORTED;
89    }
90
91    jclass mediahttpclass = env->FindClass("android/media/MediaHTTPService");
92    if (mediahttpclass == NULL) {
93        ALOGE("can't find MediaHttpService");
94        env->ExceptionClear();
95        return AMEDIA_ERROR_UNSUPPORTED;
96    }
97
98    jmethodID mediaHttpCreateMethod = env->GetStaticMethodID(mediahttpclass,
99            "createHttpServiceBinderIfNecessary", "(Ljava/lang/String;)Landroid/os/IBinder;");
100    if (mediaHttpCreateMethod == NULL) {
101        ALOGE("can't find method");
102        env->ExceptionClear();
103        return AMEDIA_ERROR_UNSUPPORTED;
104    }
105
106    jstring jloc = env->NewStringUTF(location);
107
108    service = env->CallStaticObjectMethod(mediahttpclass, mediaHttpCreateMethod, jloc);
109    env->DeleteLocalRef(jloc);
110
111    sp<IMediaHTTPService> httpService;
112    if (service != NULL) {
113        sp<IBinder> binder = ibinderForJavaObject(env, service);
114        httpService = interface_cast<IMediaHTTPService>(binder);
115    }
116
117    status_t err = mData->mImpl->setDataSource(httpService, location, NULL);
118    env->ExceptionClear();
119    return translate_error(err);
120}
121
122EXPORT
123size_t AMediaExtractor_getTrackCount(AMediaExtractor *mData) {
124    return mData->mImpl->countTracks();
125}
126
127EXPORT
128AMediaFormat* AMediaExtractor_getTrackFormat(AMediaExtractor *mData, size_t idx) {
129    sp<AMessage> format;
130    mData->mImpl->getTrackFormat(idx, &format);
131    return AMediaFormat_fromMsg(&format);
132}
133
134EXPORT
135media_status_t AMediaExtractor_selectTrack(AMediaExtractor *mData, size_t idx) {
136    ALOGV("selectTrack(%zu)", idx);
137    return translate_error(mData->mImpl->selectTrack(idx));
138}
139
140EXPORT
141media_status_t AMediaExtractor_unselectTrack(AMediaExtractor *mData, size_t idx) {
142    ALOGV("unselectTrack(%zu)", idx);
143    return translate_error(mData->mImpl->unselectTrack(idx));
144}
145
146EXPORT
147bool AMediaExtractor_advance(AMediaExtractor *mData) {
148    //ALOGV("advance");
149    return mData->mImpl->advance();
150}
151
152EXPORT
153media_status_t AMediaExtractor_seekTo(AMediaExtractor *ex, int64_t seekPosUs, SeekMode mode) {
154    android::MediaSource::ReadOptions::SeekMode sfmode;
155    if (mode == AMEDIAEXTRACTOR_SEEK_PREVIOUS_SYNC) {
156        sfmode = android::MediaSource::ReadOptions::SEEK_PREVIOUS_SYNC;
157    } else if (mode == AMEDIAEXTRACTOR_SEEK_CLOSEST_SYNC) {
158        sfmode = android::MediaSource::ReadOptions::SEEK_CLOSEST_SYNC;
159    } else {
160        sfmode = android::MediaSource::ReadOptions::SEEK_NEXT_SYNC;
161    }
162
163    return translate_error(ex->mImpl->seekTo(seekPosUs, sfmode));
164}
165
166EXPORT
167ssize_t AMediaExtractor_readSampleData(AMediaExtractor *mData, uint8_t *buffer, size_t capacity) {
168    //ALOGV("readSampleData");
169    sp<ABuffer> tmp = new ABuffer(buffer, capacity);
170    if (mData->mImpl->readSampleData(tmp) == OK) {
171        return tmp->size();
172    }
173    return -1;
174}
175
176EXPORT
177uint32_t AMediaExtractor_getSampleFlags(AMediaExtractor *mData) {
178    int sampleFlags = 0;
179    sp<MetaData> meta;
180    status_t err = mData->mImpl->getSampleMeta(&meta);
181    if (err != OK) {
182        return -1;
183    }
184    int32_t val;
185    if (meta->findInt32(kKeyIsSyncFrame, &val) && val != 0) {
186        sampleFlags |= AMEDIAEXTRACTOR_SAMPLE_FLAG_SYNC;
187    }
188
189    uint32_t type;
190    const void *data;
191    size_t size;
192    if (meta->findData(kKeyEncryptedSizes, &type, &data, &size)) {
193        sampleFlags |= AMEDIAEXTRACTOR_SAMPLE_FLAG_ENCRYPTED;
194    }
195    return sampleFlags;
196}
197
198EXPORT
199int AMediaExtractor_getSampleTrackIndex(AMediaExtractor *mData) {
200    size_t idx;
201    if (mData->mImpl->getSampleTrackIndex(&idx) != OK) {
202        return -1;
203    }
204    return idx;
205}
206
207EXPORT
208int64_t AMediaExtractor_getSampleTime(AMediaExtractor *mData) {
209    int64_t time;
210    if (mData->mImpl->getSampleTime(&time) != OK) {
211        return -1;
212    }
213    return time;
214}
215
216EXPORT
217PsshInfo* AMediaExtractor_getPsshInfo(AMediaExtractor *ex) {
218
219    if (ex->mPsshBuf != NULL) {
220        return (PsshInfo*) ex->mPsshBuf->data();
221    }
222
223    sp<AMessage> format;
224    ex->mImpl->getFileFormat(&format);
225    sp<ABuffer> buffer;
226    if(!format->findBuffer("pssh", &buffer)) {
227        return NULL;
228    }
229
230    // the format of the buffer is 1 or more of:
231    //    {
232    //        16 byte uuid
233    //        4 byte data length N
234    //        N bytes of data
235    //    }
236
237    // Determine the number of entries in the source data.
238    // Since we got the data from stagefright, we trust it is valid and properly formatted.
239    const uint8_t* data = buffer->data();
240    size_t len = buffer->size();
241    size_t numentries = 0;
242    while (len > 0) {
243        numentries++;
244
245        // skip uuid
246        data += 16;
247        len -= 16;
248
249        // get data length
250        uint32_t datalen = *((uint32_t*)data);
251        data += 4;
252        len -= 4;
253
254        // skip the data
255        data += datalen;
256        len -= datalen;
257    }
258
259    // there are <numentries> in the source buffer, we need
260    // (source buffer size) - (sizeof(uint32_t) * numentries) + sizeof(size_t)
261    //  + ((sizeof(void*) + sizeof(size_t)) * numentries) bytes for the PsshInfo structure
262    // Or in other words, the data lengths in the source structure are replaced by size_t
263    // (which may be the same size or larger, for 64 bit), and in addition there is an
264    // extra pointer for each entry, and an extra size_t for the entire PsshInfo.
265    size_t newsize = buffer->size() - (sizeof(uint32_t) * numentries) + sizeof(size_t)
266            + ((sizeof(void*) + sizeof(size_t)) * numentries);
267    ex->mPsshBuf = new ABuffer(newsize);
268    ex->mPsshBuf->setRange(0, newsize);
269
270    // copy data
271    const uint8_t* src = buffer->data();
272    uint8_t* dst = ex->mPsshBuf->data();
273    uint8_t* dstdata = dst + sizeof(size_t) + numentries * sizeof(PsshEntry);
274    *((size_t*)dst) = numentries;
275    dst += sizeof(size_t);
276    for (size_t i = 0; i < numentries; i++) {
277        // copy uuid
278        memcpy(dst, src, 16);
279        src += 16;
280        dst += 16;
281
282        // get/copy data length
283        uint32_t datalen = *((uint32_t*)src);
284        *((size_t*)dst) = datalen;
285        src += sizeof(uint32_t);
286        dst += sizeof(size_t);
287
288        // the next entry in the destination is a pointer to the actual data, which we store
289        // after the array of PsshEntry
290        *((void**)dst) = dstdata;
291        dst += sizeof(void*);
292
293        // copy the actual data
294        memcpy(dstdata, src, datalen);
295        dstdata += datalen;
296        src += datalen;
297    }
298
299    return (PsshInfo*) ex->mPsshBuf->data();
300}
301
302EXPORT
303AMediaCodecCryptoInfo *AMediaExtractor_getSampleCryptoInfo(AMediaExtractor *ex) {
304    sp<MetaData> meta;
305    if(ex->mImpl->getSampleMeta(&meta) != 0) {
306        return NULL;
307    }
308
309    uint32_t type;
310    const void *crypteddata;
311    size_t cryptedsize;
312    if (!meta->findData(kKeyEncryptedSizes, &type, &crypteddata, &cryptedsize)) {
313        return NULL;
314    }
315    size_t numSubSamples = cryptedsize / sizeof(size_t);
316
317    const void *cleardata;
318    size_t clearsize;
319    if (meta->findData(kKeyPlainSizes, &type, &cleardata, &clearsize)) {
320        if (clearsize != cryptedsize) {
321            // The two must be of the same length.
322            return NULL;
323        }
324    }
325
326    const void *key;
327    size_t keysize;
328    if (meta->findData(kKeyCryptoIV, &type, &key, &keysize)) {
329        if (keysize != 16) {
330            // IVs must be 16 bytes in length.
331            return NULL;
332        }
333    }
334
335    const void *iv;
336    size_t ivsize;
337    if (meta->findData(kKeyCryptoIV, &type, &iv, &ivsize)) {
338        if (ivsize != 16) {
339            // IVs must be 16 bytes in length.
340            return NULL;
341        }
342    }
343
344    int32_t mode;
345    if (!meta->findInt32(kKeyCryptoMode, &mode)) {
346        mode = CryptoPlugin::kMode_AES_CTR;
347    }
348
349    return AMediaCodecCryptoInfo_new(
350            numSubSamples,
351            (uint8_t*) key,
352            (uint8_t*) iv,
353            (cryptoinfo_mode_t) mode,
354            (size_t*) cleardata,
355            (size_t*) crypteddata);
356}
357
358
359} // extern "C"
360
361