AMRWriter.cpp revision ebe87f32e442c9a8fb2931632311d6c5a126eddb 
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
26namespace android {
27
28AMRWriter::AMRWriter(const char *filename)
29    : mFile(fopen(filename, "wb")),
30      mInitCheck(mFile != NULL ? OK : NO_INIT),
31      mStarted(false) {
32}
33
34AMRWriter::AMRWriter(int fd)
35    : mFile(fdopen(fd, "wb")),
36      mInitCheck(mFile != NULL ? OK : NO_INIT),
37      mStarted(false) {
38}
39
40AMRWriter::~AMRWriter() {
41    if (mStarted) {
42        stop();
43    }
44
45    if (mFile != NULL) {
46        fclose(mFile);
47        mFile = NULL;
48    }
49}
50
51status_t AMRWriter::initCheck() const {
52    return mInitCheck;
53}
54
55status_t AMRWriter::addSource(const sp<MediaSource> &source) {
56    if (mInitCheck != OK) {
57        return mInitCheck;
58    }
59
60    if (mSource != NULL) {
61        // AMR files only support a single track of audio.
62        return UNKNOWN_ERROR;
63    }
64
65    sp<MetaData> meta = source->getFormat();
66
67    const char *mime;
68    CHECK(meta->findCString(kKeyMIMEType, &mime));
69
70    bool isWide = false;
71    if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_WB)) {
72        isWide = true;
73    } else if (strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_NB)) {
74        return ERROR_UNSUPPORTED;
75    }
76
77    int32_t channelCount;
78    int32_t sampleRate;
79    CHECK(meta->findInt32(kKeyChannelCount, &channelCount));
80    CHECK_EQ(channelCount, 1);
81    CHECK(meta->findInt32(kKeySampleRate, &sampleRate));
82    CHECK_EQ(sampleRate, (isWide ? 16000 : 8000));
83
84    mSource = source;
85
86    const char *kHeader = isWide ? "#!AMR-WB\n" : "#!AMR\n";
87    size_t n = strlen(kHeader);
88    if (fwrite(kHeader, 1, n, mFile) != n) {
89        return ERROR_IO;
90    }
91
92    return OK;
93}
94
95status_t AMRWriter::start() {
96    if (mInitCheck != OK) {
97        return mInitCheck;
98    }
99
100    if (mStarted || mSource == NULL) {
101        return UNKNOWN_ERROR;
102    }
103
104    status_t err = mSource->start();
105
106    if (err != OK) {
107        return err;
108    }
109
110    pthread_attr_t attr;
111    pthread_attr_init(&attr);
112    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
113
114    mReachedEOS = false;
115    mDone = false;
116
117    pthread_create(&mThread, &attr, ThreadWrapper, this);
118    pthread_attr_destroy(&attr);
119
120    mStarted = true;
121
122    return OK;
123}
124
125void AMRWriter::stop() {
126    if (!mStarted) {
127        return;
128    }
129
130    mDone = true;
131
132    void *dummy;
133    pthread_join(mThread, &dummy);
134
135    mSource->stop();
136
137    mStarted = false;
138}
139
140// static
141void *AMRWriter::ThreadWrapper(void *me) {
142    static_cast<AMRWriter *>(me)->threadFunc();
143
144    return NULL;
145}
146
147void AMRWriter::threadFunc() {
148    while (!mDone) {
149        MediaBuffer *buffer;
150        status_t err = mSource->read(&buffer);
151
152        if (err != OK) {
153            break;
154        }
155
156        ssize_t n = fwrite(
157                (const uint8_t *)buffer->data() + buffer->range_offset(),
158                1,
159                buffer->range_length(),
160                mFile);
161
162        if (n < (ssize_t)buffer->range_length()) {
163            buffer->release();
164            buffer = NULL;
165
166            break;
167        }
168
169        buffer->release();
170        buffer = NULL;
171    }
172
173    mReachedEOS = true;
174}
175
176bool AMRWriter::reachedEOS() {
177    return mReachedEOS;
178}
179
180}  // namespace android
181