AMRWriter.cpp revision 2dec2b5be2056c6d9428897dc672185872d30d17 
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
19#include <media/stagefright/MediaBuffer.h>
20#include <media/stagefright/MediaDebug.h>
21#include <media/stagefright/MediaDefs.h>
22#include <media/stagefright/MediaErrors.h>
23#include <media/stagefright/MediaSource.h>
24#include <media/stagefright/MetaData.h>
25#include <media/mediarecorder.h>
26
27namespace android {
28
29AMRWriter::AMRWriter(const char *filename)
30    : mFile(fopen(filename, "wb")),
31      mInitCheck(mFile != NULL ? OK : NO_INIT),
32      mStarted(false),
33      mPaused(false),
34      mResumed(false) {
35}
36
37AMRWriter::AMRWriter(int fd)
38    : mFile(fdopen(fd, "wb")),
39      mInitCheck(mFile != NULL ? OK : NO_INIT),
40      mStarted(false),
41      mPaused(false),
42      mResumed(false) {
43}
44
45AMRWriter::~AMRWriter() {
46    if (mStarted) {
47        stop();
48    }
49
50    if (mFile != NULL) {
51        fclose(mFile);
52        mFile = NULL;
53    }
54}
55
56status_t AMRWriter::initCheck() const {
57    return mInitCheck;
58}
59
60status_t AMRWriter::addSource(const sp<MediaSource> &source) {
61    if (mInitCheck != OK) {
62        return mInitCheck;
63    }
64
65    if (mSource != NULL) {
66        // AMR files only support a single track of audio.
67        return UNKNOWN_ERROR;
68    }
69
70    sp<MetaData> meta = source->getFormat();
71
72    const char *mime;
73    CHECK(meta->findCString(kKeyMIMEType, &mime));
74
75    bool isWide = false;
76    if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_WB)) {
77        isWide = true;
78    } else if (strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_NB)) {
79        return ERROR_UNSUPPORTED;
80    }
81
82    int32_t channelCount;
83    int32_t sampleRate;
84    CHECK(meta->findInt32(kKeyChannelCount, &channelCount));
85    CHECK_EQ(channelCount, 1);
86    CHECK(meta->findInt32(kKeySampleRate, &sampleRate));
87    CHECK_EQ(sampleRate, (isWide ? 16000 : 8000));
88
89    mSource = source;
90
91    const char *kHeader = isWide ? "#!AMR-WB\n" : "#!AMR\n";
92    size_t n = strlen(kHeader);
93    if (fwrite(kHeader, 1, n, mFile) != n) {
94        return ERROR_IO;
95    }
96
97    return OK;
98}
99
100status_t AMRWriter::start(MetaData *params) {
101    if (mInitCheck != OK) {
102        return mInitCheck;
103    }
104
105    if (mSource == NULL) {
106        return UNKNOWN_ERROR;
107    }
108
109    if (mStarted && mPaused) {
110        mPaused = false;
111        mResumed = true;
112        return OK;
113    } else if (mStarted) {
114        // Already started, does nothing
115        return OK;
116    }
117
118    status_t err = mSource->start();
119
120    if (err != OK) {
121        return err;
122    }
123
124    pthread_attr_t attr;
125    pthread_attr_init(&attr);
126    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
127
128    mReachedEOS = false;
129    mDone = false;
130
131    pthread_create(&mThread, &attr, ThreadWrapper, this);
132    pthread_attr_destroy(&attr);
133
134    mStarted = true;
135
136    return OK;
137}
138
139void AMRWriter::pause() {
140    if (!mStarted) {
141        return;
142    }
143    mPaused = true;
144}
145
146void AMRWriter::stop() {
147    if (!mStarted) {
148        return;
149    }
150
151    mDone = true;
152
153    void *dummy;
154    pthread_join(mThread, &dummy);
155
156    mSource->stop();
157
158    mStarted = false;
159}
160
161bool AMRWriter::exceedsFileSizeLimit() {
162    if (mMaxFileSizeLimitBytes == 0) {
163        return false;
164    }
165    return mEstimatedSizeBytes >= mMaxFileSizeLimitBytes;
166}
167
168bool AMRWriter::exceedsFileDurationLimit() {
169    if (mMaxFileDurationLimitUs == 0) {
170        return false;
171    }
172    return mEstimatedDurationUs >= mMaxFileDurationLimitUs;
173}
174
175// static
176void *AMRWriter::ThreadWrapper(void *me) {
177    static_cast<AMRWriter *>(me)->threadFunc();
178
179    return NULL;
180}
181
182void AMRWriter::threadFunc() {
183    mEstimatedDurationUs = 0;
184    mEstimatedSizeBytes = 0;
185    bool stoppedPrematurely = true;
186    int64_t previousPausedDurationUs = 0;
187    int64_t maxTimestampUs = 0;
188
189    while (!mDone) {
190        MediaBuffer *buffer;
191        status_t err = mSource->read(&buffer);
192
193        if (err != OK) {
194            break;
195        }
196
197        if (mPaused) {
198            buffer->release();
199            buffer = NULL;
200            continue;
201        }
202
203        mEstimatedSizeBytes += buffer->range_length();
204        if (exceedsFileSizeLimit()) {
205            buffer->release();
206            buffer = NULL;
207            notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED, 0);
208            break;
209        }
210
211        int64_t timestampUs;
212        CHECK(buffer->meta_data()->findInt64(kKeyTime, &timestampUs));
213        if (timestampUs > mEstimatedDurationUs) {
214            mEstimatedDurationUs = timestampUs;
215        }
216        if (mResumed) {
217            previousPausedDurationUs += (timestampUs - maxTimestampUs - 20000);
218            mResumed = false;
219        }
220        timestampUs -= previousPausedDurationUs;
221        LOGV("time stamp: %lld, previous paused duration: %lld",
222                timestampUs, previousPausedDurationUs);
223        if (timestampUs > maxTimestampUs) {
224            maxTimestampUs = timestampUs;
225        }
226
227        if (exceedsFileDurationLimit()) {
228            buffer->release();
229            buffer = NULL;
230            notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_MAX_DURATION_REACHED, 0);
231            break;
232        }
233        ssize_t n = fwrite(
234                (const uint8_t *)buffer->data() + buffer->range_offset(),
235                1,
236                buffer->range_length(),
237                mFile);
238
239        if (n < (ssize_t)buffer->range_length()) {
240            buffer->release();
241            buffer = NULL;
242
243            break;
244        }
245
246        // XXX: How to tell it is stopped prematurely?
247        if (stoppedPrematurely) {
248            stoppedPrematurely = false;
249        }
250
251        buffer->release();
252        buffer = NULL;
253    }
254
255    if (stoppedPrematurely) {
256        notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_STOP_PREMATURELY, 0);
257    }
258
259    fflush(mFile);
260    fclose(mFile);
261    mFile = NULL;
262    mReachedEOS = true;
263}
264
265bool AMRWriter::reachedEOS() {
266    return mReachedEOS;
267}
268
269}  // namespace android
270