AMRWriter.cpp revision 03f6f4e7e2ce09357cbc05bb546cd8a6e54b5bae 
1/*
2 * Copyright (C) 2010 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#include <media/stagefright/AMRWriter.h>
18#include <media/stagefright/MediaBuffer.h>
19#include <media/stagefright/MediaDebug.h>
20#include <media/stagefright/MediaDefs.h>
21#include <media/stagefright/MediaErrors.h>
22#include <media/stagefright/MediaSource.h>
23#include <media/stagefright/MetaData.h>
24#include <media/mediarecorder.h>
25#include <sys/prctl.h>
26#include <sys/resource.h>
27#include <sys/types.h>
28#include <sys/stat.h>
29#include <fcntl.h>
30
31namespace android {
32
33AMRWriter::AMRWriter(const char *filename)
34    : mFd(-1),
35      mInitCheck(NO_INIT),
36      mStarted(false),
37      mPaused(false),
38      mResumed(false) {
39
40    mFd = open(filename, O_CREAT | O_LARGEFILE | O_TRUNC | O_RDWR);
41    if (mFd >= 0) {
42        mInitCheck = OK;
43    }
44}
45
46AMRWriter::AMRWriter(int fd)
47    : mFd(dup(fd)),
48      mInitCheck(mFd < 0? NO_INIT: OK),
49      mStarted(false),
50      mPaused(false),
51      mResumed(false) {
52}
53
54AMRWriter::~AMRWriter() {
55    if (mStarted) {
56        stop();
57    }
58
59    if (mFd != -1) {
60        close(mFd);
61        mFd = -1;
62    }
63}
64
65status_t AMRWriter::initCheck() const {
66    return mInitCheck;
67}
68
69status_t AMRWriter::addSource(const sp<MediaSource> &source) {
70    if (mInitCheck != OK) {
71        return mInitCheck;
72    }
73
74    if (mSource != NULL) {
75        // AMR files only support a single track of audio.
76        return UNKNOWN_ERROR;
77    }
78
79    sp<MetaData> meta = source->getFormat();
80
81    const char *mime;
82    CHECK(meta->findCString(kKeyMIMEType, &mime));
83
84    bool isWide = false;
85    if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_WB)) {
86        isWide = true;
87    } else if (strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_NB)) {
88        return ERROR_UNSUPPORTED;
89    }
90
91    int32_t channelCount;
92    int32_t sampleRate;
93    CHECK(meta->findInt32(kKeyChannelCount, &channelCount));
94    CHECK_EQ(channelCount, 1);
95    CHECK(meta->findInt32(kKeySampleRate, &sampleRate));
96    CHECK_EQ(sampleRate, (isWide ? 16000 : 8000));
97
98    mSource = source;
99
100    const char *kHeader = isWide ? "#!AMR-WB\n" : "#!AMR\n";
101    ssize_t n = strlen(kHeader);
102    if (write(mFd, kHeader, n) != n) {
103        return ERROR_IO;
104    }
105
106    return OK;
107}
108
109status_t AMRWriter::start(MetaData *params) {
110    if (mInitCheck != OK) {
111        return mInitCheck;
112    }
113
114    if (mSource == NULL) {
115        return UNKNOWN_ERROR;
116    }
117
118    if (mStarted && mPaused) {
119        mPaused = false;
120        mResumed = true;
121        return OK;
122    } else if (mStarted) {
123        // Already started, does nothing
124        return OK;
125    }
126
127    status_t err = mSource->start();
128
129    if (err != OK) {
130        return err;
131    }
132
133    pthread_attr_t attr;
134    pthread_attr_init(&attr);
135    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
136
137    mReachedEOS = false;
138    mDone = false;
139
140    pthread_create(&mThread, &attr, ThreadWrapper, this);
141    pthread_attr_destroy(&attr);
142
143    mStarted = true;
144
145    return OK;
146}
147
148status_t AMRWriter::pause() {
149    if (!mStarted) {
150        return OK;
151    }
152    mPaused = true;
153    return OK;
154}
155
156status_t AMRWriter::stop() {
157    if (!mStarted) {
158        return OK;
159    }
160
161    mDone = true;
162
163    void *dummy;
164    pthread_join(mThread, &dummy);
165
166    status_t err = (status_t) dummy;
167    {
168        status_t status = mSource->stop();
169        if (err == OK &&
170            (status != OK && status != ERROR_END_OF_STREAM)) {
171            err = status;
172        }
173    }
174
175    mStarted = false;
176    return err;
177}
178
179bool AMRWriter::exceedsFileSizeLimit() {
180    if (mMaxFileSizeLimitBytes == 0) {
181        return false;
182    }
183    return mEstimatedSizeBytes >= mMaxFileSizeLimitBytes;
184}
185
186bool AMRWriter::exceedsFileDurationLimit() {
187    if (mMaxFileDurationLimitUs == 0) {
188        return false;
189    }
190    return mEstimatedDurationUs >= mMaxFileDurationLimitUs;
191}
192
193// static
194void *AMRWriter::ThreadWrapper(void *me) {
195    return (void *) static_cast<AMRWriter *>(me)->threadFunc();
196}
197
198status_t AMRWriter::threadFunc() {
199    mEstimatedDurationUs = 0;
200    mEstimatedSizeBytes = 0;
201    bool stoppedPrematurely = true;
202    int64_t previousPausedDurationUs = 0;
203    int64_t maxTimestampUs = 0;
204    status_t err = OK;
205
206    prctl(PR_SET_NAME, (unsigned long)"AMRWriter", 0, 0, 0);
207    while (!mDone) {
208        MediaBuffer *buffer;
209        err = mSource->read(&buffer);
210
211        if (err != OK) {
212            break;
213        }
214
215        if (mPaused) {
216            buffer->release();
217            buffer = NULL;
218            continue;
219        }
220
221        mEstimatedSizeBytes += buffer->range_length();
222        if (exceedsFileSizeLimit()) {
223            buffer->release();
224            buffer = NULL;
225            notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED, 0);
226            break;
227        }
228
229        int64_t timestampUs;
230        CHECK(buffer->meta_data()->findInt64(kKeyTime, &timestampUs));
231        if (timestampUs > mEstimatedDurationUs) {
232            mEstimatedDurationUs = timestampUs;
233        }
234        if (mResumed) {
235            previousPausedDurationUs += (timestampUs - maxTimestampUs - 20000);
236            mResumed = false;
237        }
238        timestampUs -= previousPausedDurationUs;
239        LOGV("time stamp: %lld, previous paused duration: %lld",
240                timestampUs, previousPausedDurationUs);
241        if (timestampUs > maxTimestampUs) {
242            maxTimestampUs = timestampUs;
243        }
244
245        if (exceedsFileDurationLimit()) {
246            buffer->release();
247            buffer = NULL;
248            notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_MAX_DURATION_REACHED, 0);
249            break;
250        }
251        ssize_t n = write(mFd,
252                        (const uint8_t *)buffer->data() + buffer->range_offset(),
253                        buffer->range_length());
254
255        if (n < (ssize_t)buffer->range_length()) {
256            buffer->release();
257            buffer = NULL;
258
259            break;
260        }
261
262        // XXX: How to tell it is stopped prematurely?
263        if (stoppedPrematurely) {
264            stoppedPrematurely = false;
265        }
266
267        buffer->release();
268        buffer = NULL;
269    }
270
271    if (stoppedPrematurely) {
272        notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_TRACK_INFO_COMPLETION_STATUS, UNKNOWN_ERROR);
273    }
274
275    close(mFd);
276    mFd = -1;
277    mReachedEOS = true;
278    if (err == ERROR_END_OF_STREAM) {
279        return OK;
280    }
281    return err;
282}
283
284bool AMRWriter::reachedEOS() {
285    return mReachedEOS;
286}
287
288}  // namespace android
289