StagefrightRecorder.cpp revision 7405500bb3b5f8e8e739e344bc9d036c2736fcdf 
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 "StagefrightRecorder"
19#include <utils/Log.h>
20
21#include "StagefrightRecorder.h"
22
23#include <binder/IPCThreadState.h>
24#include <media/stagefright/AudioSource.h>
25#include <media/stagefright/AMRWriter.h>
26#include <media/stagefright/CameraSource.h>
27#include <media/stagefright/MPEG4Writer.h>
28#include <media/stagefright/MediaDebug.h>
29#include <media/stagefright/MediaDefs.h>
30#include <media/stagefright/MetaData.h>
31#include <media/stagefright/OMXClient.h>
32#include <media/stagefright/OMXCodec.h>
33#include <camera/ICamera.h>
34#include <camera/Camera.h>
35#include <camera/CameraParameters.h>
36#include <surfaceflinger/ISurface.h>
37#include <utils/Errors.h>
38#include <sys/types.h>
39#include <unistd.h>
40#include <ctype.h>
41
42namespace android {
43
44StagefrightRecorder::StagefrightRecorder() {
45    reset();
46}
47
48StagefrightRecorder::~StagefrightRecorder() {
49    stop();
50
51    if (mOutputFd >= 0) {
52        ::close(mOutputFd);
53        mOutputFd = -1;
54    }
55}
56
57status_t StagefrightRecorder::init() {
58    return OK;
59}
60
61status_t StagefrightRecorder::setAudioSource(audio_source as) {
62    mAudioSource = as;
63
64    return OK;
65}
66
67status_t StagefrightRecorder::setVideoSource(video_source vs) {
68    mVideoSource = vs;
69
70    return OK;
71}
72
73status_t StagefrightRecorder::setOutputFormat(output_format of) {
74    mOutputFormat = of;
75
76    return OK;
77}
78
79status_t StagefrightRecorder::setAudioEncoder(audio_encoder ae) {
80    mAudioEncoder = ae;
81
82    return OK;
83}
84
85status_t StagefrightRecorder::setVideoEncoder(video_encoder ve) {
86    mVideoEncoder = ve;
87
88    return OK;
89}
90
91status_t StagefrightRecorder::setVideoSize(int width, int height) {
92    if (width <= 0 || height <= 0) {
93        LOGE("Invalid video size: %dx%d", width, height);
94        return BAD_VALUE;
95    }
96
97    // Additional check on the dimension will be performed later
98    mVideoWidth = width;
99    mVideoHeight = height;
100
101    return OK;
102}
103
104status_t StagefrightRecorder::setVideoFrameRate(int frames_per_second) {
105    if (frames_per_second <= 0 || frames_per_second > 30) {
106        LOGE("Invalid video frame rate: %d", frames_per_second);
107        return BAD_VALUE;
108    }
109
110    // Additional check on the frame rate will be performed later
111    mFrameRate = frames_per_second;
112
113    return OK;
114}
115
116status_t StagefrightRecorder::setCamera(const sp<ICamera> &camera) {
117    LOGV("setCamera: pid %d pid %d", IPCThreadState::self()->getCallingPid(), getpid());
118    if (camera == 0) {
119        LOGE("camera is NULL");
120        return UNKNOWN_ERROR;
121    }
122
123    mFlags &= ~ FLAGS_SET_CAMERA | FLAGS_HOT_CAMERA;
124    mCamera = Camera::create(camera);
125    if (mCamera == 0) {
126        LOGE("Unable to connect to camera");
127        return UNKNOWN_ERROR;
128    }
129
130    LOGV("Connected to camera");
131    mFlags |= FLAGS_SET_CAMERA;
132    if (mCamera->previewEnabled()) {
133        LOGV("camera is hot");
134        mFlags |= FLAGS_HOT_CAMERA;
135    }
136
137    return OK;
138}
139
140status_t StagefrightRecorder::setPreviewSurface(const sp<ISurface> &surface) {
141    mPreviewSurface = surface;
142
143    return OK;
144}
145
146status_t StagefrightRecorder::setOutputFile(const char *path) {
147    // We don't actually support this at all, as the media_server process
148    // no longer has permissions to create files.
149
150    return UNKNOWN_ERROR;
151}
152
153status_t StagefrightRecorder::setOutputFile(int fd, int64_t offset, int64_t length) {
154    // These don't make any sense, do they?
155    CHECK_EQ(offset, 0);
156    CHECK_EQ(length, 0);
157
158    if (mOutputFd >= 0) {
159        ::close(mOutputFd);
160    }
161    mOutputFd = dup(fd);
162
163    return OK;
164}
165
166// Attempt to parse an int64 literal optionally surrounded by whitespace,
167// returns true on success, false otherwise.
168static bool safe_strtoi64(const char *s, int64_t *val) {
169    char *end;
170    *val = strtoll(s, &end, 10);
171
172    if (end == s || errno == ERANGE) {
173        return false;
174    }
175
176    // Skip trailing whitespace
177    while (isspace(*end)) {
178        ++end;
179    }
180
181    // For a successful return, the string must contain nothing but a valid
182    // int64 literal optionally surrounded by whitespace.
183
184    return *end == '\0';
185}
186
187// Return true if the value is in [0, 0x007FFFFFFF]
188static bool safe_strtoi32(const char *s, int32_t *val) {
189    int64_t temp;
190    if (safe_strtoi64(s, &temp)) {
191        if (temp >= 0 && temp <= 0x007FFFFFFF) {
192            *val = static_cast<int32_t>(temp);
193            return true;
194        }
195    }
196    return false;
197}
198
199// Trim both leading and trailing whitespace from the given string.
200static void TrimString(String8 *s) {
201    size_t num_bytes = s->bytes();
202    const char *data = s->string();
203
204    size_t leading_space = 0;
205    while (leading_space < num_bytes && isspace(data[leading_space])) {
206        ++leading_space;
207    }
208
209    size_t i = num_bytes;
210    while (i > leading_space && isspace(data[i - 1])) {
211        --i;
212    }
213
214    s->setTo(String8(&data[leading_space], i - leading_space));
215}
216
217status_t StagefrightRecorder::setParamAudioSamplingRate(int32_t sampleRate) {
218    LOGV("setParamAudioSamplingRate: %d", sampleRate);
219    if (sampleRate <= 0) {
220        LOGE("Invalid audio sampling rate: %d", sampleRate);
221        return BAD_VALUE;
222    }
223
224    // Additional check on the sample rate will be performed later.
225    mSampleRate = sampleRate;
226    return OK;
227}
228
229status_t StagefrightRecorder::setParamAudioNumberOfChannels(int32_t channels) {
230    LOGV("setParamAudioNumberOfChannels: %d", channels);
231    if (channels <= 0 || channels >= 3) {
232        LOGE("Invalid number of audio channels: %d", channels);
233    }
234
235    // Additional check on the number of channels will be performed later.
236    mAudioChannels = channels;
237    return OK;
238}
239
240status_t StagefrightRecorder::setParamAudioEncodingBitRate(int32_t bitRate) {
241    LOGV("setParamAudioEncodingBitRate: %d", bitRate);
242    if (bitRate <= 0) {
243        LOGE("Invalid audio encoding bit rate: %d", bitRate);
244        return BAD_VALUE;
245    }
246
247    // The target bit rate may not be exactly the same as the requested.
248    // It depends on many factors, such as rate control, and the bit rate
249    // range that a specific encoder supports. The mismatch between the
250    // the target and requested bit rate will NOT be treated as an error.
251    mAudioBitRate = bitRate;
252    return OK;
253}
254
255status_t StagefrightRecorder::setParamVideoEncodingBitRate(int32_t bitRate) {
256    LOGV("setParamVideoEncodingBitRate: %d", bitRate);
257    if (bitRate <= 0) {
258        LOGE("Invalid video encoding bit rate: %d", bitRate);
259        return BAD_VALUE;
260    }
261
262    // The target bit rate may not be exactly the same as the requested.
263    // It depends on many factors, such as rate control, and the bit rate
264    // range that a specific encoder supports. The mismatch between the
265    // the target and requested bit rate will NOT be treated as an error.
266    mVideoBitRate = bitRate;
267    return OK;
268}
269
270status_t StagefrightRecorder::setParamMaxDurationOrFileSize(int64_t limit,
271        bool limit_is_duration) {
272    LOGV("setParamMaxDurationOrFileSize: limit (%lld) for %s",
273            limit, limit_is_duration?"duration":"size");
274    if (limit_is_duration) {  // limit is in ms
275        if (limit <= 1000) {  // XXX: 1 second
276            LOGE("Max file duration is too short: %lld us", limit);
277        }
278        mMaxFileDurationUs = limit * 1000LL;
279    } else {
280        if (limit <= 1024) {  // XXX: 1 kB
281            LOGE("Max file size is too small: %lld bytes", limit);
282        }
283        mMaxFileSizeBytes = limit;
284    }
285    return OK;
286}
287
288status_t StagefrightRecorder::setParamInterleaveDuration(int32_t durationUs) {
289    LOGV("setParamInterleaveDuration: %d", durationUs);
290    if (durationUs <= 20000) {  // XXX: 20 ms
291        LOGE("Audio/video interleave duration is too small: %d us", durationUs);
292        return BAD_VALUE;
293    }
294    mInterleaveDurationUs = durationUs;
295    return OK;
296}
297
298status_t StagefrightRecorder::setParameter(
299        const String8 &key, const String8 &value) {
300    LOGV("setParameter: key (%s) => value (%s)", key.string(), value.string());
301    if (key == "max-duration") {
302        int64_t max_duration_ms;
303        if (safe_strtoi64(value.string(), &max_duration_ms)) {
304            return setParamMaxDurationOrFileSize(
305                    max_duration_ms, true /* limit_is_duration */);
306        }
307    } else if (key == "max-filesize") {
308        int64_t max_filesize_bytes;
309        if (safe_strtoi64(value.string(), &max_filesize_bytes)) {
310            return setParamMaxDurationOrFileSize(
311                    max_filesize_bytes, false /* limit is filesize */);
312        }
313    } else if (key == "audio-param-sampling-rate") {
314        int32_t sampling_rate;
315        if (safe_strtoi32(value.string(), &sampling_rate)) {
316            return setParamAudioSamplingRate(sampling_rate);
317        }
318    } else if (key == "audio-param-number-of-channels") {
319        int32_t number_of_channels;
320        if (safe_strtoi32(value.string(), &number_of_channels)) {
321            return setParamAudioNumberOfChannels(number_of_channels);
322        }
323    } else if (key == "audio-param-encoding-bitrate") {
324        int32_t audio_bitrate;
325        if (safe_strtoi32(value.string(), &audio_bitrate)) {
326            return setParamAudioEncodingBitRate(audio_bitrate);
327        }
328    } else if (key == "video-param-encoding-bitrate") {
329        int32_t video_bitrate;
330        if (safe_strtoi32(value.string(), &video_bitrate)) {
331            return setParamVideoEncodingBitRate(video_bitrate);
332        }
333    } else if (key == "param-interleave-duration-us") {
334        int32_t durationUs;
335        if (safe_strtoi32(value.string(), &durationUs)) {
336            return setParamInterleaveDuration(durationUs);
337        }
338    } else {
339        LOGE("setParameter: failed to find key %s", key.string());
340    }
341    return BAD_VALUE;
342}
343
344status_t StagefrightRecorder::setParameters(const String8 &params) {
345    LOGV("setParameters: %s", params.string());
346    const char *cparams = params.string();
347    const char *key_start = cparams;
348    for (;;) {
349        const char *equal_pos = strchr(key_start, '=');
350        if (equal_pos == NULL) {
351            LOGE("Parameters %s miss a value", cparams);
352            return BAD_VALUE;
353        }
354        String8 key(key_start, equal_pos - key_start);
355        TrimString(&key);
356        if (key.length() == 0) {
357            LOGE("Parameters %s contains an empty key", cparams);
358            return BAD_VALUE;
359        }
360        const char *value_start = equal_pos + 1;
361        const char *semicolon_pos = strchr(value_start, ';');
362        String8 value;
363        if (semicolon_pos == NULL) {
364            value.setTo(value_start);
365        } else {
366            value.setTo(value_start, semicolon_pos - value_start);
367        }
368        if (setParameter(key, value) != OK) {
369            return BAD_VALUE;
370        }
371        if (semicolon_pos == NULL) {
372            break;  // Reaches the end
373        }
374        key_start = semicolon_pos + 1;
375    }
376    return OK;
377}
378
379status_t StagefrightRecorder::setListener(const sp<IMediaPlayerClient> &listener) {
380    mListener = listener;
381
382    return OK;
383}
384
385status_t StagefrightRecorder::prepare() {
386    return OK;
387}
388
389status_t StagefrightRecorder::start() {
390    if (mWriter != NULL) {
391        return UNKNOWN_ERROR;
392    }
393
394    switch (mOutputFormat) {
395        case OUTPUT_FORMAT_DEFAULT:
396        case OUTPUT_FORMAT_THREE_GPP:
397        case OUTPUT_FORMAT_MPEG_4:
398            return startMPEG4Recording();
399
400        case OUTPUT_FORMAT_AMR_NB:
401        case OUTPUT_FORMAT_AMR_WB:
402            return startAMRRecording();
403
404        case OUTPUT_FORMAT_AAC_ADIF:
405        case OUTPUT_FORMAT_AAC_ADTS:
406            return startAACRecording();
407
408        default:
409            return UNKNOWN_ERROR;
410    }
411}
412
413sp<MediaSource> StagefrightRecorder::createAudioSource() {
414    sp<AudioSource> audioSource =
415        new AudioSource(
416                mAudioSource,
417                mSampleRate,
418                AudioSystem::CHANNEL_IN_MONO);
419
420    status_t err = audioSource->initCheck();
421
422    if (err != OK) {
423        LOGE("audio source is not initialized");
424        return NULL;
425    }
426
427    sp<MetaData> encMeta = new MetaData;
428    const char *mime;
429    switch (mAudioEncoder) {
430        case AUDIO_ENCODER_AMR_NB:
431        case AUDIO_ENCODER_DEFAULT:
432            mime = MEDIA_MIMETYPE_AUDIO_AMR_NB;
433            break;
434        case AUDIO_ENCODER_AMR_WB:
435            mime = MEDIA_MIMETYPE_AUDIO_AMR_WB;
436            break;
437        case AUDIO_ENCODER_AAC:
438            mime = MEDIA_MIMETYPE_AUDIO_AAC;
439            break;
440        default:
441            LOGE("Unknown audio encoder: %d", mAudioEncoder);
442            return NULL;
443    }
444    encMeta->setCString(kKeyMIMEType, mime);
445
446    int32_t maxInputSize;
447    CHECK(audioSource->getFormat()->findInt32(
448                kKeyMaxInputSize, &maxInputSize));
449
450    encMeta->setInt32(kKeyMaxInputSize, maxInputSize);
451    encMeta->setInt32(kKeyChannelCount, mAudioChannels);
452    encMeta->setInt32(kKeySampleRate, mSampleRate);
453    encMeta->setInt32(kKeyBitRate, mAudioBitRate);
454
455    OMXClient client;
456    CHECK_EQ(client.connect(), OK);
457
458    sp<MediaSource> audioEncoder =
459        OMXCodec::Create(client.interface(), encMeta,
460                         true /* createEncoder */, audioSource);
461
462    return audioEncoder;
463}
464
465status_t StagefrightRecorder::startAACRecording() {
466    CHECK(mOutputFormat == OUTPUT_FORMAT_AAC_ADIF ||
467          mOutputFormat == OUTPUT_FORMAT_AAC_ADTS);
468
469    CHECK(mAudioEncoder == AUDIO_ENCODER_AAC);
470    CHECK(mAudioSource != AUDIO_SOURCE_LIST_END);
471    CHECK(mOutputFd >= 0);
472
473    CHECK(0 == "AACWriter is not implemented yet");
474
475    return OK;
476}
477
478status_t StagefrightRecorder::startAMRRecording() {
479    CHECK(mOutputFormat == OUTPUT_FORMAT_AMR_NB ||
480          mOutputFormat == OUTPUT_FORMAT_AMR_WB);
481
482    if (mOutputFormat == OUTPUT_FORMAT_AMR_NB) {
483        if (mAudioEncoder != AUDIO_ENCODER_DEFAULT &&
484            mAudioEncoder != AUDIO_ENCODER_AMR_NB) {
485            LOGE("Invalid encoder %d used for AMRNB recording",
486                    mAudioEncoder);
487            return UNKNOWN_ERROR;
488        }
489        if (mSampleRate != 8000) {
490            LOGE("Invalid sampling rate %d used for AMRNB recording",
491                    mSampleRate);
492            return UNKNOWN_ERROR;
493        }
494    } else {  // mOutputFormat must be OUTPUT_FORMAT_AMR_WB
495        if (mAudioEncoder != AUDIO_ENCODER_AMR_WB) {
496            LOGE("Invlaid encoder %d used for AMRWB recording",
497                    mAudioEncoder);
498            return UNKNOWN_ERROR;
499        }
500        if (mSampleRate != 16000) {
501            LOGE("Invalid sample rate %d used for AMRWB recording",
502                    mSampleRate);
503            return UNKNOWN_ERROR;
504        }
505    }
506    if (mAudioChannels != 1) {
507        LOGE("Invalid number of audio channels %d used for amr recording",
508                mAudioChannels);
509        return UNKNOWN_ERROR;
510    }
511
512    if (mAudioSource >= AUDIO_SOURCE_LIST_END) {
513        LOGE("Invalid audio source: %d", mAudioSource);
514        return UNKNOWN_ERROR;
515    }
516
517    sp<MediaSource> audioEncoder = createAudioSource();
518
519    if (audioEncoder == NULL) {
520        return UNKNOWN_ERROR;
521    }
522
523    CHECK(mOutputFd >= 0);
524    mWriter = new AMRWriter(dup(mOutputFd));
525    mWriter->addSource(audioEncoder);
526
527    if (mMaxFileDurationUs != 0) {
528        mWriter->setMaxFileDuration(mMaxFileDurationUs);
529    }
530    if (mMaxFileSizeBytes != 0) {
531        mWriter->setMaxFileSize(mMaxFileSizeBytes);
532    }
533    mWriter->setListener(mListener);
534    mWriter->start();
535
536    return OK;
537}
538
539status_t StagefrightRecorder::startMPEG4Recording() {
540    mWriter = new MPEG4Writer(dup(mOutputFd));
541
542    // Add audio source first if it exists
543    if (mAudioSource != AUDIO_SOURCE_LIST_END) {
544        sp<MediaSource> audioEncoder;
545        switch(mAudioEncoder) {
546            case AUDIO_ENCODER_AMR_NB:
547            case AUDIO_ENCODER_AMR_WB:
548            case AUDIO_ENCODER_AAC:
549                audioEncoder = createAudioSource();
550                break;
551            default:
552                LOGE("Unsupported audio encoder: %d", mAudioEncoder);
553                return UNKNOWN_ERROR;
554        }
555
556        if (audioEncoder == NULL) {
557            return UNKNOWN_ERROR;
558        }
559
560        mWriter->addSource(audioEncoder);
561    }
562    if (mVideoSource == VIDEO_SOURCE_DEFAULT
563            || mVideoSource == VIDEO_SOURCE_CAMERA) {
564        CHECK(mCamera != NULL);
565
566        // Set the actual video recording frame size
567        CameraParameters params(mCamera->getParameters());
568        params.setPreviewSize(mVideoWidth, mVideoHeight);
569        params.setPreviewFrameRate(mFrameRate);
570        String8 s = params.flatten();
571        CHECK_EQ(OK, mCamera->setParameters(s));
572        CameraParameters newCameraParams(mCamera->getParameters());
573
574        // Check on video frame size
575        int frameWidth = 0, frameHeight = 0;
576        newCameraParams.getPreviewSize(&frameWidth, &frameHeight);
577        if (frameWidth  < 0 || frameWidth  != mVideoWidth ||
578            frameHeight < 0 || frameHeight != mVideoHeight) {
579            LOGE("Failed to set the video frame size to %dx%d",
580                    mVideoWidth, mVideoHeight);
581            return UNKNOWN_ERROR;
582        }
583
584        // Check on video frame rate
585        int frameRate = newCameraParams.getPreviewFrameRate();
586        if (frameRate < 0 || (frameRate - mFrameRate) != 0) {
587            LOGE("Failed to set frame rate to %d fps. The actual "
588                 "frame rate is %d", mFrameRate, frameRate);
589        }
590
591        CHECK_EQ(OK, mCamera->setPreviewDisplay(mPreviewSurface));
592
593        sp<CameraSource> cameraSource =
594            CameraSource::CreateFromCamera(mCamera);
595
596        CHECK(cameraSource != NULL);
597
598        sp<MetaData> enc_meta = new MetaData;
599        enc_meta->setInt32(kKeyBitRate, mVideoBitRate);
600        enc_meta->setInt32(kKeySampleRate, mFrameRate);  // XXX: kKeySampleRate?
601
602        switch (mVideoEncoder) {
603            case VIDEO_ENCODER_H263:
604                enc_meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_VIDEO_H263);
605                break;
606
607            case VIDEO_ENCODER_MPEG_4_SP:
608                enc_meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_VIDEO_MPEG4);
609                break;
610
611            case VIDEO_ENCODER_H264:
612                enc_meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_VIDEO_AVC);
613                break;
614
615            default:
616                CHECK(!"Should not be here, unsupported video encoding.");
617                break;
618        }
619
620        sp<MetaData> meta = cameraSource->getFormat();
621
622        int32_t width, height;
623        CHECK(meta->findInt32(kKeyWidth, &width));
624        CHECK(meta->findInt32(kKeyHeight, &height));
625
626        enc_meta->setInt32(kKeyWidth, width);
627        enc_meta->setInt32(kKeyHeight, height);
628
629        OMXClient client;
630        CHECK_EQ(client.connect(), OK);
631
632        sp<MediaSource> encoder =
633            OMXCodec::Create(
634                    client.interface(), enc_meta,
635                    true /* createEncoder */, cameraSource);
636
637        CHECK(mOutputFd >= 0);
638        mWriter->addSource(encoder);
639    }
640
641    {
642        // MPEGWriter specific handling
643        MPEG4Writer *writer = ((MPEG4Writer *) mWriter.get());  // mWriter is an MPEGWriter
644        writer->setInterleaveDuration(mInterleaveDurationUs);
645    }
646
647    if (mMaxFileDurationUs != 0) {
648        mWriter->setMaxFileDuration(mMaxFileDurationUs);
649    }
650    if (mMaxFileSizeBytes != 0) {
651        mWriter->setMaxFileSize(mMaxFileSizeBytes);
652    }
653    mWriter->setListener(mListener);
654    mWriter->start();
655    return OK;
656}
657
658status_t StagefrightRecorder::stop() {
659    if (mWriter == NULL) {
660        return UNKNOWN_ERROR;
661    }
662
663    mWriter->stop();
664    mWriter = NULL;
665
666    return OK;
667}
668
669status_t StagefrightRecorder::close() {
670    stop();
671
672    if (mCamera != 0) {
673        if ((mFlags & FLAGS_HOT_CAMERA) == 0) {
674            LOGV("Camera was cold when we started, stopping preview");
675            mCamera->stopPreview();
676        }
677        if (mFlags & FLAGS_SET_CAMERA) {
678            LOGV("Unlocking camera");
679            mCamera->unlock();
680        }
681        mFlags = 0;
682    }
683    return OK;
684}
685
686status_t StagefrightRecorder::reset() {
687    stop();
688
689    // No audio or video source by default
690    mAudioSource = AUDIO_SOURCE_LIST_END;
691    mVideoSource = VIDEO_SOURCE_LIST_END;
692
693    // Default parameters
694    mOutputFormat  = OUTPUT_FORMAT_THREE_GPP;
695    mAudioEncoder  = AUDIO_ENCODER_AMR_NB;
696    mVideoEncoder  = VIDEO_ENCODER_H263;
697    mVideoWidth    = 176;
698    mVideoHeight   = 144;
699    mFrameRate     = 20;
700    mVideoBitRate  = 192000;
701    mSampleRate    = 8000;
702    mAudioChannels = 1;
703    mAudioBitRate  = 12200;
704
705    mOutputFd = -1;
706    mFlags = 0;
707
708    return OK;
709}
710
711status_t StagefrightRecorder::getMaxAmplitude(int *max) {
712    *max = 0;
713
714    return OK;
715}
716
717}  // namespace android
718