StagefrightMetadataRetriever.cpp revision e94bd14078d327ef2f800e69907efce641a13272 
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    decoder->start();
124
125    // Read one output buffer, ignore format change notifications
126    // and spurious empty buffers.
127
128    MediaSource::ReadOptions options;
129    int64_t thumbNailTime;
130    if (trackMeta->findInt64(kKeyThumbnailTime, &thumbNailTime)) {
131        options.setSeekTo(thumbNailTime);
132    } else {
133        thumbNailTime = -1;
134    }
135
136    MediaBuffer *buffer = NULL;
137    status_t err;
138    do {
139        if (buffer != NULL) {
140            buffer->release();
141            buffer = NULL;
142        }
143        err = decoder->read(&buffer, &options);
144        options.clearSeekTo();
145    } while (err == INFO_FORMAT_CHANGED
146             || (buffer != NULL && buffer->range_length() == 0));
147
148    if (err != OK) {
149        CHECK_EQ(buffer, NULL);
150
151        LOGV("decoding frame failed.");
152        decoder->stop();
153
154        return NULL;
155    }
156
157    LOGV("successfully decoded video frame.");
158
159    int64_t timeUs;
160    CHECK(buffer->meta_data()->findInt64(kKeyTime, &timeUs));
161    if (thumbNailTime >= 0) {
162        if (timeUs != thumbNailTime) {
163            const char *mime;
164            CHECK(trackMeta->findCString(kKeyMIMEType, &mime));
165
166            LOGV("thumbNailTime = %lld us, timeUs = %lld us, mime = %s",
167                 thumbNailTime, timeUs, mime);
168        }
169    }
170
171    sp<MetaData> meta = decoder->getFormat();
172
173    int32_t width, height;
174    CHECK(meta->findInt32(kKeyWidth, &width));
175    CHECK(meta->findInt32(kKeyHeight, &height));
176
177    VideoFrame *frame = new VideoFrame;
178    frame->mWidth = width;
179    frame->mHeight = height;
180    frame->mDisplayWidth = width;
181    frame->mDisplayHeight = height;
182    frame->mSize = width * height * 2;
183    frame->mData = new uint8_t[frame->mSize];
184
185    int32_t srcFormat;
186    CHECK(meta->findInt32(kKeyColorFormat, &srcFormat));
187
188    ColorConverter converter(
189            (OMX_COLOR_FORMATTYPE)srcFormat, OMX_COLOR_Format16bitRGB565);
190    CHECK(converter.isValid());
191
192    converter.convert(
193            width, height,
194            (const uint8_t *)buffer->data() + buffer->range_offset(),
195            0,
196            frame->mData, width * 2);
197
198    buffer->release();
199    buffer = NULL;
200
201    decoder->stop();
202
203    return frame;
204}
205
206VideoFrame *StagefrightMetadataRetriever::captureFrame() {
207    LOGV("captureFrame");
208
209    if (mExtractor.get() == NULL) {
210        LOGV("no extractor.");
211        return NULL;
212    }
213
214    size_t n = mExtractor->countTracks();
215    size_t i;
216    for (i = 0; i < n; ++i) {
217        sp<MetaData> meta = mExtractor->getTrackMetaData(i);
218
219        const char *mime;
220        CHECK(meta->findCString(kKeyMIMEType, &mime));
221
222        if (!strncasecmp(mime, "video/", 6)) {
223            break;
224        }
225    }
226
227    if (i == n) {
228        LOGV("no video track found.");
229        return NULL;
230    }
231
232    sp<MetaData> trackMeta = mExtractor->getTrackMetaData(
233            i, MediaExtractor::kIncludeExtensiveMetaData);
234
235    sp<MediaSource> source = mExtractor->getTrack(i);
236
237    if (source.get() == NULL) {
238        LOGV("unable to instantiate video track.");
239        return NULL;
240    }
241
242    VideoFrame *frame =
243        extractVideoFrameWithCodecFlags(
244                &mClient, trackMeta, source, OMXCodec::kPreferSoftwareCodecs);
245
246    if (frame == NULL) {
247        LOGV("Software decoder failed to extract thumbnail, "
248             "trying hardware decoder.");
249
250        frame = extractVideoFrameWithCodecFlags(&mClient, trackMeta, source, 0);
251    }
252
253    return frame;
254}
255
256MediaAlbumArt *StagefrightMetadataRetriever::extractAlbumArt() {
257    LOGV("extractAlbumArt (extractor: %s)", mExtractor.get() != NULL ? "YES" : "NO");
258
259    if (mExtractor == NULL) {
260        return NULL;
261    }
262
263    if (!mParsedMetaData) {
264        parseMetaData();
265
266        mParsedMetaData = true;
267    }
268
269    if (mAlbumArt) {
270        return new MediaAlbumArt(*mAlbumArt);
271    }
272
273    return NULL;
274}
275
276const char *StagefrightMetadataRetriever::extractMetadata(int keyCode) {
277    if (mExtractor == NULL) {
278        return NULL;
279    }
280
281    if (!mParsedMetaData) {
282        parseMetaData();
283
284        mParsedMetaData = true;
285    }
286
287    ssize_t index = mMetaData.indexOfKey(keyCode);
288
289    if (index < 0) {
290        return NULL;
291    }
292
293    return strdup(mMetaData.valueAt(index).string());
294}
295
296void StagefrightMetadataRetriever::parseMetaData() {
297    sp<MetaData> meta = mExtractor->getMetaData();
298
299    struct Map {
300        int from;
301        int to;
302    };
303    static const Map kMap[] = {
304        { kKeyMIMEType, METADATA_KEY_MIMETYPE },
305        { kKeyCDTrackNumber, METADATA_KEY_CD_TRACK_NUMBER },
306        { kKeyDiscNumber, METADATA_KEY_DISC_NUMBER },
307        { kKeyAlbum, METADATA_KEY_ALBUM },
308        { kKeyArtist, METADATA_KEY_ARTIST },
309        { kKeyAlbumArtist, METADATA_KEY_ALBUMARTIST },
310        { kKeyAuthor, METADATA_KEY_AUTHOR },
311        { kKeyComposer, METADATA_KEY_COMPOSER },
312        { kKeyDate, METADATA_KEY_DATE },
313        { kKeyGenre, METADATA_KEY_GENRE },
314        { kKeyTitle, METADATA_KEY_TITLE },
315        { kKeyYear, METADATA_KEY_YEAR },
316        { kKeyWriter, METADATA_KEY_WRITER },
317    };
318    static const size_t kNumMapEntries = sizeof(kMap) / sizeof(kMap[0]);
319
320    for (size_t i = 0; i < kNumMapEntries; ++i) {
321        const char *value;
322        if (meta->findCString(kMap[i].from, &value)) {
323            mMetaData.add(kMap[i].to, String8(value));
324        }
325    }
326
327    const void *data;
328    uint32_t type;
329    size_t dataSize;
330    if (meta->findData(kKeyAlbumArt, &type, &data, &dataSize)) {
331        mAlbumArt = new MediaAlbumArt;
332        mAlbumArt->mSize = dataSize;
333        mAlbumArt->mData = new uint8_t[dataSize];
334        memcpy(mAlbumArt->mData, data, dataSize);
335    }
336
337    size_t numTracks = mExtractor->countTracks();
338
339    char tmp[32];
340    sprintf(tmp, "%d", numTracks);
341
342    mMetaData.add(METADATA_KEY_NUM_TRACKS, String8(tmp));
343
344    // The overall duration is the duration of the longest track.
345    int64_t maxDurationUs = 0;
346    for (size_t i = 0; i < numTracks; ++i) {
347        sp<MetaData> trackMeta = mExtractor->getTrackMetaData(i);
348
349        int64_t durationUs;
350        if (trackMeta->findInt64(kKeyDuration, &durationUs)) {
351            if (durationUs > maxDurationUs) {
352                maxDurationUs = durationUs;
353            }
354        }
355    }
356
357    // The duration value is a string representing the duration in ms.
358    sprintf(tmp, "%lld", (maxDurationUs + 500) / 1000);
359    mMetaData.add(METADATA_KEY_DURATION, String8(tmp));
360}
361
362
363}  // namespace android
364