StagefrightMetadataRetriever.cpp revision 16afe2fb439cab6125bb46a07a8078d4ce1c1ea5 
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,
112        uint32_t flags,
113        int64_t frameTimeUs,
114        int seekMode) {
115    sp<MediaSource> decoder =
116        OMXCodec::Create(
117                client->interface(), source->getFormat(), false, source,
118                NULL, flags | OMXCodec::kClientNeedsFramebuffer);
119
120    if (decoder.get() == NULL) {
121        LOGV("unable to instantiate video decoder.");
122
123        return NULL;
124    }
125
126    status_t err = decoder->start();
127    if (err != OK) {
128        LOGW("OMXCodec::start returned error %d (0x%08x)\n", err, err);
129        return NULL;
130    }
131
132    // Read one output buffer, ignore format change notifications
133    // and spurious empty buffers.
134
135    MediaSource::ReadOptions options;
136    if (seekMode < MediaSource::ReadOptions::SEEK_PREVIOUS_SYNC ||
137        seekMode > MediaSource::ReadOptions::SEEK_CLOSEST) {
138
139        LOGE("Unknown seek mode: %d", seekMode);
140        return NULL;
141    }
142
143    MediaSource::ReadOptions::SeekMode mode =
144            static_cast<MediaSource::ReadOptions::SeekMode>(seekMode);
145
146    int64_t thumbNailTime;
147    if (frameTimeUs < 0 && trackMeta->findInt64(kKeyThumbnailTime, &thumbNailTime)) {
148        options.setSeekTo(thumbNailTime, mode);
149    } else {
150        thumbNailTime = -1;
151        options.setSeekTo(frameTimeUs, mode);
152    }
153
154    MediaBuffer *buffer = NULL;
155    do {
156        if (buffer != NULL) {
157            buffer->release();
158            buffer = NULL;
159        }
160        err = decoder->read(&buffer, &options);
161        options.clearSeekTo();
162    } while (err == INFO_FORMAT_CHANGED
163             || (buffer != NULL && buffer->range_length() == 0));
164
165    if (err != OK) {
166        CHECK_EQ(buffer, NULL);
167
168        LOGV("decoding frame failed.");
169        decoder->stop();
170
171        return NULL;
172    }
173
174    LOGV("successfully decoded video frame.");
175
176    int32_t unreadable;
177    if (buffer->meta_data()->findInt32(kKeyIsUnreadable, &unreadable)
178            && unreadable != 0) {
179        LOGV("video frame is unreadable, decoder does not give us access "
180             "to the video data.");
181
182        buffer->release();
183        buffer = NULL;
184
185        decoder->stop();
186
187        return NULL;
188    }
189
190    int64_t timeUs;
191    CHECK(buffer->meta_data()->findInt64(kKeyTime, &timeUs));
192    if (thumbNailTime >= 0) {
193        if (timeUs != thumbNailTime) {
194            const char *mime;
195            CHECK(trackMeta->findCString(kKeyMIMEType, &mime));
196
197            LOGV("thumbNailTime = %lld us, timeUs = %lld us, mime = %s",
198                 thumbNailTime, timeUs, mime);
199        }
200    }
201
202    sp<MetaData> meta = decoder->getFormat();
203
204    int32_t width, height;
205    CHECK(meta->findInt32(kKeyWidth, &width));
206    CHECK(meta->findInt32(kKeyHeight, &height));
207
208    int32_t crop_left, crop_top, crop_right, crop_bottom;
209    if (!meta->findRect(
210                kKeyCropRect,
211                &crop_left, &crop_top, &crop_right, &crop_bottom)) {
212        crop_left = crop_top = 0;
213        crop_right = width - 1;
214        crop_bottom = height - 1;
215    }
216
217    int32_t rotationAngle;
218    if (!trackMeta->findInt32(kKeyRotation, &rotationAngle)) {
219        rotationAngle = 0;  // By default, no rotation
220    }
221
222    VideoFrame *frame = new VideoFrame;
223    frame->mWidth = crop_right - crop_left + 1;
224    frame->mHeight = crop_bottom - crop_top + 1;
225    frame->mDisplayWidth = frame->mWidth;
226    frame->mDisplayHeight = frame->mHeight;
227    frame->mSize = frame->mWidth * frame->mHeight * 2;
228    frame->mData = new uint8_t[frame->mSize];
229    frame->mRotationAngle = rotationAngle;
230
231    int32_t srcFormat;
232    CHECK(meta->findInt32(kKeyColorFormat, &srcFormat));
233
234    ColorConverter converter(
235            (OMX_COLOR_FORMATTYPE)srcFormat, OMX_COLOR_Format16bitRGB565);
236    CHECK(converter.isValid());
237
238    converter.convert(
239            (const uint8_t *)buffer->data() + buffer->range_offset(),
240            width, height,
241            crop_left, crop_top, crop_right, crop_bottom,
242            frame->mData,
243            frame->mWidth,
244            frame->mHeight,
245            0, 0, frame->mWidth - 1, frame->mHeight - 1);
246
247    buffer->release();
248    buffer = NULL;
249
250    decoder->stop();
251
252    return frame;
253}
254
255VideoFrame *StagefrightMetadataRetriever::getFrameAtTime(
256        int64_t timeUs, int option) {
257
258    LOGV("getFrameAtTime: %lld us option: %d", timeUs, option);
259    if (0 == (mMode & METADATA_MODE_FRAME_CAPTURE_ONLY)) {
260        LOGV("captureFrame disabled by mode (0x%08x)", mMode);
261
262        return NULL;
263    }
264
265    if (mExtractor.get() == NULL) {
266        LOGV("no extractor.");
267        return NULL;
268    }
269
270    size_t n = mExtractor->countTracks();
271    size_t i;
272    for (i = 0; i < n; ++i) {
273        sp<MetaData> meta = mExtractor->getTrackMetaData(i);
274
275        const char *mime;
276        CHECK(meta->findCString(kKeyMIMEType, &mime));
277
278        if (!strncasecmp(mime, "video/", 6)) {
279            break;
280        }
281    }
282
283    if (i == n) {
284        LOGV("no video track found.");
285        return NULL;
286    }
287
288    sp<MetaData> trackMeta = mExtractor->getTrackMetaData(
289            i, MediaExtractor::kIncludeExtensiveMetaData);
290
291    sp<MediaSource> source = mExtractor->getTrack(i);
292
293    if (source.get() == NULL) {
294        LOGV("unable to instantiate video track.");
295        return NULL;
296    }
297
298    VideoFrame *frame =
299        extractVideoFrameWithCodecFlags(
300                &mClient, trackMeta, source, OMXCodec::kPreferSoftwareCodecs,
301                timeUs, option);
302
303    if (frame == NULL) {
304        LOGV("Software decoder failed to extract thumbnail, "
305             "trying hardware decoder.");
306
307        frame = extractVideoFrameWithCodecFlags(&mClient, trackMeta, source, 0,
308                        timeUs, option);
309    }
310
311    return frame;
312}
313
314MediaAlbumArt *StagefrightMetadataRetriever::extractAlbumArt() {
315    LOGV("extractAlbumArt (extractor: %s)", mExtractor.get() != NULL ? "YES" : "NO");
316
317    if (0 == (mMode & METADATA_MODE_METADATA_RETRIEVAL_ONLY)) {
318        LOGV("extractAlbumArt/metadata retrieval disabled by mode");
319
320        return NULL;
321    }
322
323    if (mExtractor == NULL) {
324        return NULL;
325    }
326
327    if (!mParsedMetaData) {
328        parseMetaData();
329
330        mParsedMetaData = true;
331    }
332
333    if (mAlbumArt) {
334        return new MediaAlbumArt(*mAlbumArt);
335    }
336
337    return NULL;
338}
339
340const char *StagefrightMetadataRetriever::extractMetadata(int keyCode) {
341    if (0 == (mMode & METADATA_MODE_METADATA_RETRIEVAL_ONLY)) {
342        LOGV("extractAlbumArt/metadata retrieval disabled by mode");
343
344        return NULL;
345    }
346
347    if (mExtractor == NULL) {
348        return NULL;
349    }
350
351    if (!mParsedMetaData) {
352        parseMetaData();
353
354        mParsedMetaData = true;
355    }
356
357    ssize_t index = mMetaData.indexOfKey(keyCode);
358
359    if (index < 0) {
360        return NULL;
361    }
362
363    return strdup(mMetaData.valueAt(index).string());
364}
365
366void StagefrightMetadataRetriever::parseMetaData() {
367    sp<MetaData> meta = mExtractor->getMetaData();
368
369    struct Map {
370        int from;
371        int to;
372    };
373    static const Map kMap[] = {
374        { kKeyMIMEType, METADATA_KEY_MIMETYPE },
375        { kKeyCDTrackNumber, METADATA_KEY_CD_TRACK_NUMBER },
376        { kKeyDiscNumber, METADATA_KEY_DISC_NUMBER },
377        { kKeyAlbum, METADATA_KEY_ALBUM },
378        { kKeyArtist, METADATA_KEY_ARTIST },
379        { kKeyAlbumArtist, METADATA_KEY_ALBUMARTIST },
380        { kKeyAuthor, METADATA_KEY_AUTHOR },
381        { kKeyComposer, METADATA_KEY_COMPOSER },
382        { kKeyDate, METADATA_KEY_DATE },
383        { kKeyGenre, METADATA_KEY_GENRE },
384        { kKeyTitle, METADATA_KEY_TITLE },
385        { kKeyYear, METADATA_KEY_YEAR },
386        { kKeyWriter, METADATA_KEY_WRITER },
387    };
388    static const size_t kNumMapEntries = sizeof(kMap) / sizeof(kMap[0]);
389
390    for (size_t i = 0; i < kNumMapEntries; ++i) {
391        const char *value;
392        if (meta->findCString(kMap[i].from, &value)) {
393            mMetaData.add(kMap[i].to, String8(value));
394        }
395    }
396
397    const void *data;
398    uint32_t type;
399    size_t dataSize;
400    if (meta->findData(kKeyAlbumArt, &type, &data, &dataSize)) {
401        mAlbumArt = new MediaAlbumArt;
402        mAlbumArt->mSize = dataSize;
403        mAlbumArt->mData = new uint8_t[dataSize];
404        memcpy(mAlbumArt->mData, data, dataSize);
405    }
406
407    size_t numTracks = mExtractor->countTracks();
408
409    char tmp[32];
410    sprintf(tmp, "%d", numTracks);
411
412    mMetaData.add(METADATA_KEY_NUM_TRACKS, String8(tmp));
413
414    // The overall duration is the duration of the longest track.
415    int64_t maxDurationUs = 0;
416    for (size_t i = 0; i < numTracks; ++i) {
417        sp<MetaData> trackMeta = mExtractor->getTrackMetaData(i);
418
419        int64_t durationUs;
420        if (trackMeta->findInt64(kKeyDuration, &durationUs)) {
421            if (durationUs > maxDurationUs) {
422                maxDurationUs = durationUs;
423            }
424        }
425    }
426
427    // The duration value is a string representing the duration in ms.
428    sprintf(tmp, "%lld", (maxDurationUs + 500) / 1000);
429    mMetaData.add(METADATA_KEY_DURATION, String8(tmp));
430
431    if (numTracks == 1) {
432        const char *fileMIME;
433        CHECK(meta->findCString(kKeyMIMEType, &fileMIME));
434
435        if (!strcasecmp(fileMIME, "video/x-matroska")) {
436            sp<MetaData> trackMeta = mExtractor->getTrackMetaData(0);
437            const char *trackMIME;
438            CHECK(trackMeta->findCString(kKeyMIMEType, &trackMIME));
439
440            if (!strncasecmp("audio/", trackMIME, 6)) {
441                // The matroska file only contains a single audio track,
442                // rewrite its mime type.
443                mMetaData.add(
444                        METADATA_KEY_MIMETYPE, String8("audio/x-matroska"));
445            }
446        }
447    }
448}
449
450}  // namespace android
451