AMRWriter.cpp revision c7fc37a3dab9bd1f96713649f351b5990e6316ff 
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
28namespace android {
29
30AMRWriter::AMRWriter(const char *filename)
31    : mFile(fopen(filename, "wb")),
32      mFd(mFile == NULL? -1: fileno(mFile)),
33      mInitCheck(mFile != NULL ? OK : NO_INIT),
34      mStarted(false),
35      mPaused(false),
36      mResumed(false) {
37}
38
39AMRWriter::AMRWriter(int fd)
40    : mFile(fdopen(fd, "wb")),
41      mFd(mFile == NULL? -1: fileno(mFile)),
42      mInitCheck(mFile != NULL ? OK : NO_INIT),
43      mStarted(false),
44      mPaused(false),
45      mResumed(false) {
46}
47
48AMRWriter::~AMRWriter() {
49    if (mStarted) {
50        stop();
51    }
52
53    if (mFile != NULL) {
54        fclose(mFile);
55        mFile = NULL;
56    }
57}
58
59status_t AMRWriter::initCheck() const {
60    return mInitCheck;
61}
62
63status_t AMRWriter::addSource(const sp<MediaSource> &source) {
64    if (mInitCheck != OK) {
65        return mInitCheck;
66    }
67
68    if (mSource != NULL) {
69        // AMR files only support a single track of audio.
70        return UNKNOWN_ERROR;
71    }
72
73    sp<MetaData> meta = source->getFormat();
74
75    const char *mime;
76    CHECK(meta->findCString(kKeyMIMEType, &mime));
77
78    bool isWide = false;
79    if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_WB)) {
80        isWide = true;
81    } else if (strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_NB)) {
82        return ERROR_UNSUPPORTED;
83    }
84
85    int32_t channelCount;
86    int32_t sampleRate;
87    CHECK(meta->findInt32(kKeyChannelCount, &channelCount));
88    CHECK_EQ(channelCount, 1);
89    CHECK(meta->findInt32(kKeySampleRate, &sampleRate));
90    CHECK_EQ(sampleRate, (isWide ? 16000 : 8000));
91
92    mSource = source;
93
94    const char *kHeader = isWide ? "#!AMR-WB\n" : "#!AMR\n";
95    size_t n = strlen(kHeader);
96    if (write(mFd, kHeader, n) != n) {
97        return ERROR_IO;
98    }
99
100    return OK;
101}
102
103status_t AMRWriter::start(MetaData *params) {
104    if (mInitCheck != OK) {
105        return mInitCheck;
106    }
107
108    if (mSource == NULL) {
109        return UNKNOWN_ERROR;
110    }
111
112    if (mStarted && mPaused) {
113        mPaused = false;
114        mResumed = true;
115        return OK;
116    } else if (mStarted) {
117        // Already started, does nothing
118        return OK;
119    }
120
121    status_t err = mSource->start();
122
123    if (err != OK) {
124        return err;
125    }
126
127    pthread_attr_t attr;
128    pthread_attr_init(&attr);
129    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
130
131    mReachedEOS = false;
132    mDone = false;
133
134    pthread_create(&mThread, &attr, ThreadWrapper, this);
135    pthread_attr_destroy(&attr);
136
137    mStarted = true;
138
139    return OK;
140}
141
142status_t AMRWriter::pause() {
143    if (!mStarted) {
144        return OK;
145    }
146    mPaused = true;
147    return OK;
148}
149
150status_t AMRWriter::stop() {
151    if (!mStarted) {
152        return OK;
153    }
154
155    mDone = true;
156
157    void *dummy;
158    pthread_join(mThread, &dummy);
159
160    status_t err = (status_t) dummy;
161    {
162        status_t status = mSource->stop();
163        if (err == OK &&
164            (status != OK && status != ERROR_END_OF_STREAM)) {
165            err = status;
166        }
167    }
168
169    mStarted = false;
170    return err;
171}
172
173bool AMRWriter::exceedsFileSizeLimit() {
174    if (mMaxFileSizeLimitBytes == 0) {
175        return false;
176    }
177    return mEstimatedSizeBytes >= mMaxFileSizeLimitBytes;
178}
179
180bool AMRWriter::exceedsFileDurationLimit() {
181    if (mMaxFileDurationLimitUs == 0) {
182        return false;
183    }
184    return mEstimatedDurationUs >= mMaxFileDurationLimitUs;
185}
186
187// static
188void *AMRWriter::ThreadWrapper(void *me) {
189    return (void *) static_cast<AMRWriter *>(me)->threadFunc();
190}
191
192status_t AMRWriter::threadFunc() {
193    mEstimatedDurationUs = 0;
194    mEstimatedSizeBytes = 0;
195    bool stoppedPrematurely = true;
196    int64_t previousPausedDurationUs = 0;
197    int64_t maxTimestampUs = 0;
198    status_t err = OK;
199
200    prctl(PR_SET_NAME, (unsigned long)"AMRWriter", 0, 0, 0);
201    while (!mDone) {
202        MediaBuffer *buffer;
203        err = mSource->read(&buffer);
204
205        if (err != OK) {
206            break;
207        }
208
209        if (mPaused) {
210            buffer->release();
211            buffer = NULL;
212            continue;
213        }
214
215        mEstimatedSizeBytes += buffer->range_length();
216        if (exceedsFileSizeLimit()) {
217            buffer->release();
218            buffer = NULL;
219            notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED, 0);
220            break;
221        }
222
223        int64_t timestampUs;
224        CHECK(buffer->meta_data()->findInt64(kKeyTime, &timestampUs));
225        if (timestampUs > mEstimatedDurationUs) {
226            mEstimatedDurationUs = timestampUs;
227        }
228        if (mResumed) {
229            previousPausedDurationUs += (timestampUs - maxTimestampUs - 20000);
230            mResumed = false;
231        }
232        timestampUs -= previousPausedDurationUs;
233        LOGV("time stamp: %lld, previous paused duration: %lld",
234                timestampUs, previousPausedDurationUs);
235        if (timestampUs > maxTimestampUs) {
236            maxTimestampUs = timestampUs;
237        }
238
239        if (exceedsFileDurationLimit()) {
240            buffer->release();
241            buffer = NULL;
242            notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_MAX_DURATION_REACHED, 0);
243            break;
244        }
245        ssize_t n = write(mFd,
246                        (const uint8_t *)buffer->data() + buffer->range_offset(),
247                        buffer->range_length());
248
249        if (n < (ssize_t)buffer->range_length()) {
250            buffer->release();
251            buffer = NULL;
252
253            break;
254        }
255
256        // XXX: How to tell it is stopped prematurely?
257        if (stoppedPrematurely) {
258            stoppedPrematurely = false;
259        }
260
261        buffer->release();
262        buffer = NULL;
263    }
264
265    if (stoppedPrematurely) {
266        notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_COMPLETION_STATUS, UNKNOWN_ERROR);
267    }
268
269    fflush(mFile);
270    fclose(mFile);
271    mFile = NULL;
272    mReachedEOS = true;
273    if (err == ERROR_END_OF_STREAM) {
274        return OK;
275    }
276    return err;
277}
278
279bool AMRWriter::reachedEOS() {
280    return mReachedEOS;
281}
282
283}  // namespace android
284