StagefrightMetadataRetriever.cpp revision 139a5d5bd33c9fc7708d0a79f11ee928f7796e6b 
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 "StagefrightMetadataRetriever"
19#include <utils/Log.h>
20
21#include "include/StagefrightMetadataRetriever.h"
22
23#include <media/stagefright/ColorConverter.h>
24#include <media/stagefright/DataSource.h>
25#include <media/stagefright/FileSource.h>
26#include <media/stagefright/MediaDebug.h>
27#include <media/stagefright/MediaExtractor.h>
28#include <media/stagefright/MetaData.h>
29#include <media/stagefright/OMXCodec.h>
30
31namespace android {
32
33StagefrightMetadataRetriever::StagefrightMetadataRetriever()
34    : mParsedMetaData(false),
35      mAlbumArt(NULL) {
36    LOGV("StagefrightMetadataRetriever()");
37
38    DataSource::RegisterDefaultSniffers();
39    CHECK_EQ(mClient.connect(), OK);
40}
41
42StagefrightMetadataRetriever::~StagefrightMetadataRetriever() {
43    LOGV("~StagefrightMetadataRetriever()");
44
45    delete mAlbumArt;
46    mAlbumArt = NULL;
47
48    mClient.disconnect();
49}
50
51status_t StagefrightMetadataRetriever::setDataSource(const char *uri) {
52    LOGV("setDataSource(%s)", uri);
53
54    mParsedMetaData = false;
55    mMetaData.clear();
56    delete mAlbumArt;
57    mAlbumArt = NULL;
58
59    mSource = DataSource::CreateFromURI(uri);
60
61    if (mSource == NULL) {
62        return UNKNOWN_ERROR;
63    }
64
65    mExtractor = MediaExtractor::Create(mSource);
66
67    if (mExtractor == NULL) {
68        mSource.clear();
69
70        return UNKNOWN_ERROR;
71    }
72
73    return OK;
74}
75
76// Warning caller retains ownership of the filedescriptor! Dup it if necessary.
77status_t StagefrightMetadataRetriever::setDataSource(
78        int fd, int64_t offset, int64_t length) {
79    fd = dup(fd);
80
81    LOGV("setDataSource(%d, %lld, %lld)", fd, offset, length);
82
83    mParsedMetaData = false;
84    mMetaData.clear();
85    delete mAlbumArt;
86    mAlbumArt = NULL;
87
88    mSource = new FileSource(fd, offset, length);
89
90    status_t err;
91    if ((err = mSource->initCheck()) != OK) {
92        mSource.clear();
93
94        return err;
95    }
96
97    mExtractor = MediaExtractor::Create(mSource);
98
99    if (mExtractor == NULL) {
100        mSource.clear();
101
102        return UNKNOWN_ERROR;
103    }
104
105    return OK;
106}
107
108static VideoFrame *extractVideoFrameWithCodecFlags(
109        OMXClient *client,
110        const sp<MetaData> &trackMeta,
111        const sp<MediaSource> &source, uint32_t flags) {
112    sp<MediaSource> decoder =
113        OMXCodec::Create(
114                client->interface(), source->getFormat(), false, source,
115                NULL, flags);
116
117    if (decoder.get() == NULL) {
118        LOGV("unable to instantiate video decoder.");
119
120        return NULL;
121    }
122
123    status_t err = decoder->start();
124    if (err != OK) {
125        LOGW("OMXCodec::start returned error %d (0x%08x)\n", err, err);
126        return NULL;
127    }
128
129    // Read one output buffer, ignore format change notifications
130    // and spurious empty buffers.
131
132    MediaSource::ReadOptions options;
133    int64_t thumbNailTime;
134    if (trackMeta->findInt64(kKeyThumbnailTime, &thumbNailTime)) {
135        options.setSeekTo(thumbNailTime);
136    } else {
137        thumbNailTime = -1;
138    }
139
140    MediaBuffer *buffer = NULL;
141    do {
142        if (buffer != NULL) {
143            buffer->release();
144            buffer = NULL;
145        }
146        err = decoder->read(&buffer, &options);
147        options.clearSeekTo();
148    } while (err == INFO_FORMAT_CHANGED
149             || (buffer != NULL && buffer->range_length() == 0));
150
151    if (err != OK) {
152        CHECK_EQ(buffer, NULL);
153
154        LOGV("decoding frame failed.");
155        decoder->stop();
156
157        return NULL;
158    }
159
160    LOGV("successfully decoded video frame.");
161
162    int64_t timeUs;
163    CHECK(buffer->meta_data()->findInt64(kKeyTime, &timeUs));
164    if (thumbNailTime >= 0) {
165        if (timeUs != thumbNailTime) {
166            const char *mime;
167            CHECK(trackMeta->findCString(kKeyMIMEType, &mime));
168
169            LOGV("thumbNailTime = %lld us, timeUs = %lld us, mime = %s",
170                 thumbNailTime, timeUs, mime);
171        }
172    }
173
174    sp<MetaData> meta = decoder->getFormat();
175
176    int32_t width, height;
177    CHECK(meta->findInt32(kKeyWidth, &width));
178    CHECK(meta->findInt32(kKeyHeight, &height));
179
180    VideoFrame *frame = new VideoFrame;
181    frame->mWidth = width;
182    frame->mHeight = height;
183    frame->mDisplayWidth = width;
184    frame->mDisplayHeight = height;
185    frame->mSize = width * height * 2;
186    frame->mData = new uint8_t[frame->mSize];
187
188    int32_t srcFormat;
189    CHECK(meta->findInt32(kKeyColorFormat, &srcFormat));
190
191    ColorConverter converter(
192            (OMX_COLOR_FORMATTYPE)srcFormat, OMX_COLOR_Format16bitRGB565);
193    CHECK(converter.isValid());
194
195    converter.convert(
196            width, height,
197            (const uint8_t *)buffer->data() + buffer->range_offset(),
198            0,
199            frame->mData, width * 2);
200
201    buffer->release();
202    buffer = NULL;
203
204    decoder->stop();
205
206    return frame;
207}
208
209VideoFrame *StagefrightMetadataRetriever::captureFrame() {
210    LOGV("captureFrame");
211
212    if (0 == (mMode & METADATA_MODE_FRAME_CAPTURE_ONLY)) {
213        LOGV("captureFrame disabled by mode (0x%08x)", mMode);
214
215        return NULL;
216    }
217
218    if (mExtractor.get() == NULL) {
219        LOGV("no extractor.");
220        return NULL;
221    }
222
223    size_t n = mExtractor->countTracks();
224    size_t i;
225    for (i = 0; i < n; ++i) {
226        sp<MetaData> meta = mExtractor->getTrackMetaData(i);
227
228        const char *mime;
229        CHECK(meta->findCString(kKeyMIMEType, &mime));
230
231        if (!strncasecmp(mime, "video/", 6)) {
232            break;
233        }
234    }
235
236    if (i == n) {
237        LOGV("no video track found.");
238        return NULL;
239    }
240
241    sp<MetaData> trackMeta = mExtractor->getTrackMetaData(
242            i, MediaExtractor::kIncludeExtensiveMetaData);
243
244    sp<MediaSource> source = mExtractor->getTrack(i);
245
246    if (source.get() == NULL) {
247        LOGV("unable to instantiate video track.");
248        return NULL;
249    }
250
251    VideoFrame *frame =
252        extractVideoFrameWithCodecFlags(
253                &mClient, trackMeta, source, OMXCodec::kPreferSoftwareCodecs);
254
255    if (frame == NULL) {
256        LOGV("Software decoder failed to extract thumbnail, "
257             "trying hardware decoder.");
258
259        frame = extractVideoFrameWithCodecFlags(&mClient, trackMeta, source, 0);
260    }
261
262    return frame;
263}
264
265MediaAlbumArt *StagefrightMetadataRetriever::extractAlbumArt() {
266    LOGV("extractAlbumArt (extractor: %s)", mExtractor.get() != NULL ? "YES" : "NO");
267
268    if (0 == (mMode & METADATA_MODE_METADATA_RETRIEVAL_ONLY)) {
269        LOGV("extractAlbumArt/metadata retrieval disabled by mode");
270
271        return NULL;
272    }
273
274    if (mExtractor == NULL) {
275        return NULL;
276    }
277
278    if (!mParsedMetaData) {
279        parseMetaData();
280
281        mParsedMetaData = true;
282    }
283
284    if (mAlbumArt) {
285        return new MediaAlbumArt(*mAlbumArt);
286    }
287
288    return NULL;
289}
290
291const char *StagefrightMetadataRetriever::extractMetadata(int keyCode) {
292    if (0 == (mMode & METADATA_MODE_METADATA_RETRIEVAL_ONLY)) {
293        LOGV("extractAlbumArt/metadata retrieval disabled by mode");
294
295        return NULL;
296    }
297
298    if (mExtractor == NULL) {
299        return NULL;
300    }
301
302    if (!mParsedMetaData) {
303        parseMetaData();
304
305        mParsedMetaData = true;
306    }
307
308    ssize_t index = mMetaData.indexOfKey(keyCode);
309
310    if (index < 0) {
311        return NULL;
312    }
313
314    return strdup(mMetaData.valueAt(index).string());
315}
316
317void StagefrightMetadataRetriever::parseMetaData() {
318    sp<MetaData> meta = mExtractor->getMetaData();
319
320    struct Map {
321        int from;
322        int to;
323    };
324    static const Map kMap[] = {
325        { kKeyMIMEType, METADATA_KEY_MIMETYPE },
326        { kKeyCDTrackNumber, METADATA_KEY_CD_TRACK_NUMBER },
327        { kKeyDiscNumber, METADATA_KEY_DISC_NUMBER },
328        { kKeyAlbum, METADATA_KEY_ALBUM },
329        { kKeyArtist, METADATA_KEY_ARTIST },
330        { kKeyAlbumArtist, METADATA_KEY_ALBUMARTIST },
331        { kKeyAuthor, METADATA_KEY_AUTHOR },
332        { kKeyComposer, METADATA_KEY_COMPOSER },
333        { kKeyDate, METADATA_KEY_DATE },
334        { kKeyGenre, METADATA_KEY_GENRE },
335        { kKeyTitle, METADATA_KEY_TITLE },
336        { kKeyYear, METADATA_KEY_YEAR },
337        { kKeyWriter, METADATA_KEY_WRITER },
338    };
339    static const size_t kNumMapEntries = sizeof(kMap) / sizeof(kMap[0]);
340
341    for (size_t i = 0; i < kNumMapEntries; ++i) {
342        const char *value;
343        if (meta->findCString(kMap[i].from, &value)) {
344            mMetaData.add(kMap[i].to, String8(value));
345        }
346    }
347
348    const void *data;
349    uint32_t type;
350    size_t dataSize;
351    if (meta->findData(kKeyAlbumArt, &type, &data, &dataSize)) {
352        mAlbumArt = new MediaAlbumArt;
353        mAlbumArt->mSize = dataSize;
354        mAlbumArt->mData = new uint8_t[dataSize];
355        memcpy(mAlbumArt->mData, data, dataSize);
356    }
357
358    size_t numTracks = mExtractor->countTracks();
359
360    char tmp[32];
361    sprintf(tmp, "%d", numTracks);
362
363    mMetaData.add(METADATA_KEY_NUM_TRACKS, String8(tmp));
364
365    // The overall duration is the duration of the longest track.
366    int64_t maxDurationUs = 0;
367    for (size_t i = 0; i < numTracks; ++i) {
368        sp<MetaData> trackMeta = mExtractor->getTrackMetaData(i);
369
370        int64_t durationUs;
371        if (trackMeta->findInt64(kKeyDuration, &durationUs)) {
372            if (durationUs > maxDurationUs) {
373                maxDurationUs = durationUs;
374            }
375        }
376    }
377
378    // The duration value is a string representing the duration in ms.
379    sprintf(tmp, "%lld", (maxDurationUs + 500) / 1000);
380    mMetaData.add(METADATA_KEY_DURATION, String8(tmp));
381}
382
383
384}  // namespace android
385