AACEncoder.cpp revision f60cafe0e6aad8f9ce54660fa88b651ae4e749e6 
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//#define LOG_NDEBUG 0
18#define LOG_TAG "AACEncoder"
19#include <utils/Log.h>
20
21#include "AACEncoder.h"
22#include "voAAC.h"
23#include "cmnMemory.h"
24
25#include <media/stagefright/MediaBufferGroup.h>
26#include <media/stagefright/MediaDebug.h>
27#include <media/stagefright/MediaDefs.h>
28#include <media/stagefright/MediaErrors.h>
29#include <media/stagefright/MetaData.h>
30
31namespace android {
32
33AACEncoder::AACEncoder(const sp<MediaSource> &source, const sp<MetaData> &meta)
34    : mSource(source),
35      mMeta(meta),
36      mStarted(false),
37      mBufferGroup(NULL),
38      mInputBuffer(NULL),
39      mEncoderHandle(NULL),
40      mApiHandle(NULL),
41      mMemOperator(NULL) {
42}
43
44status_t AACEncoder::initCheck() {
45    CHECK(mApiHandle == NULL && mEncoderHandle == NULL);
46    CHECK(mMeta->findInt32(kKeySampleRate, &mSampleRate));
47    CHECK(mMeta->findInt32(kKeyChannelCount, &mChannels));
48    CHECK(mMeta->findInt32(kKeyBitRate, &mBitRate));
49
50    mApiHandle = new VO_AUDIO_CODECAPI;
51    CHECK(mApiHandle);
52
53    if (VO_ERR_NONE != voGetAACEncAPI(mApiHandle)) {
54        LOGE("Failed to get api handle");
55        return UNKNOWN_ERROR;
56    }
57
58    mMemOperator = new VO_MEM_OPERATOR;
59    CHECK(mMemOperator != NULL);
60    mMemOperator->Alloc = cmnMemAlloc;
61    mMemOperator->Copy = cmnMemCopy;
62    mMemOperator->Free = cmnMemFree;
63    mMemOperator->Set = cmnMemSet;
64    mMemOperator->Check = cmnMemCheck;
65
66    VO_CODEC_INIT_USERDATA userData;
67    memset(&userData, 0, sizeof(userData));
68    userData.memflag = VO_IMF_USERMEMOPERATOR;
69    userData.memData = (VO_PTR) mMemOperator;
70    if (VO_ERR_NONE != mApiHandle->Init(&mEncoderHandle, VO_AUDIO_CodingAAC, &userData)) {
71        LOGE("Failed to init AAC encoder");
72        return UNKNOWN_ERROR;
73    }
74    if (OK != setAudioSpecificConfigData()) {
75        LOGE("Failed to configure AAC encoder");
76        return UNKNOWN_ERROR;
77    }
78
79    // Configure AAC encoder$
80    AACENC_PARAM params;
81    memset(&params, 0, sizeof(params));
82    params.sampleRate = mSampleRate;
83    params.bitRate = mBitRate;
84    params.nChannels = mChannels;
85    params.adtsUsed = 0;  // For MP4 file, don't use adts format$
86    if (VO_ERR_NONE != mApiHandle->SetParam(mEncoderHandle, VO_PID_AAC_ENCPARAM,  &params)) {
87        LOGE("Failed to set AAC encoder parameters");
88        return UNKNOWN_ERROR;
89    }
90
91    return OK;
92}
93
94static status_t getSampleRateTableIndex(int32_t sampleRate, int32_t &index) {
95    static const int32_t kSampleRateTable[] = {
96        96000, 88200, 64000, 48000, 44100, 32000,
97        24000, 22050, 16000, 12000, 11025, 8000
98    };
99    const int32_t tableSize = sizeof(kSampleRateTable) / sizeof(kSampleRateTable[0]);
100    for (int32_t i = 0; i < tableSize; ++i) {
101        if (sampleRate == kSampleRateTable[i]) {
102            index = i;
103            return OK;
104        }
105    }
106
107    LOGE("Sampling rate %d bps is not supported", sampleRate);
108    return UNKNOWN_ERROR;
109}
110
111status_t AACEncoder::setAudioSpecificConfigData() {
112    LOGV("setAudioSpecificConfigData: %d hz, %d bps, and %d channels",
113         mSampleRate, mBitRate, mChannels);
114
115    int32_t index;
116    CHECK_EQ(OK, getSampleRateTableIndex(mSampleRate, index));
117    if (mChannels > 2 || mChannels <= 0) {
118        LOGE("Unsupported number of channels(%d)", mChannels);
119        return UNKNOWN_ERROR;
120    }
121
122    // OMX_AUDIO_AACObjectLC
123    mAudioSpecificConfigData[0] = ((0x02 << 3) | (index >> 1));
124    mAudioSpecificConfigData[1] = ((index & 0x01) << 7) | (mChannels << 3);
125    return OK;
126}
127
128AACEncoder::~AACEncoder() {
129    if (mStarted) {
130        stop();
131    }
132}
133
134status_t AACEncoder::start(MetaData *params) {
135    CHECK(!mStarted);
136
137    mBufferGroup = new MediaBufferGroup;
138    mBufferGroup->add_buffer(new MediaBuffer(2048));
139
140    CHECK_EQ(OK, initCheck());
141
142    mFrameCount = 0;
143    mSource->start(params);
144
145    mStarted = true;
146
147    return OK;
148}
149
150status_t AACEncoder::stop() {
151    CHECK(mStarted);
152
153    if (mInputBuffer) {
154        mInputBuffer->release();
155        mInputBuffer = NULL;
156    }
157
158    delete mBufferGroup;
159    mBufferGroup = NULL;
160
161    mSource->stop();
162
163    if (mEncoderHandle) {
164        CHECK_EQ(VO_ERR_NONE, mApiHandle->Uninit(mEncoderHandle));
165        mEncoderHandle = NULL;
166    }
167    delete mApiHandle;
168    mApiHandle = NULL;
169
170    mStarted = false;
171
172    return OK;
173}
174
175sp<MetaData> AACEncoder::getFormat() {
176    sp<MetaData> srcFormat = mSource->getFormat();
177
178    mMeta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_AAC);
179
180    int64_t durationUs;
181    if (srcFormat->findInt64(kKeyDuration, &durationUs)) {
182        mMeta->setInt64(kKeyDuration, durationUs);
183    }
184
185    mMeta->setCString(kKeyDecoderComponent, "AACEncoder");
186
187    return mMeta;
188}
189
190status_t AACEncoder::read(
191        MediaBuffer **out, const ReadOptions *options) {
192    status_t err;
193
194    *out = NULL;
195
196    int64_t seekTimeUs;
197    CHECK(options == NULL || !options->getSeekTo(&seekTimeUs));
198
199    MediaBuffer *buffer;
200    CHECK_EQ(mBufferGroup->acquire_buffer(&buffer), OK);
201    uint8_t *outPtr = (uint8_t *)buffer->data();
202
203    if (mFrameCount == 0) {
204        memcpy(outPtr, mAudioSpecificConfigData, 2);
205        buffer->set_range(0, 2);
206        buffer->meta_data()->setInt32(kKeyIsCodecConfig, true);
207        *out = buffer;
208        mInputBuffer = NULL;
209        ++mFrameCount;
210        return OK;
211    } else if (mFrameCount == 1) {
212        buffer->meta_data()->setInt32(kKeyIsCodecConfig, false);
213    }
214
215    // XXX: We assume that the input buffer contains at least
216    // (actually, exactly) 1024 PCM samples. This needs to be fixed.
217    if (mInputBuffer == NULL) {
218        if (mSource->read(&mInputBuffer, options) != OK) {
219            LOGE("failed to read from input audio source");
220            return UNKNOWN_ERROR;
221        }
222        if (mInputBuffer->range_length() == 0) {
223            mInputBuffer->release();
224            mInputBuffer = NULL;
225            return ERROR_END_OF_STREAM;
226        }
227        VO_CODECBUFFER inputData;
228        memset(&inputData, 0, sizeof(inputData));
229        inputData.Buffer = (unsigned char*) mInputBuffer->data();
230        inputData.Length = mInputBuffer->range_length();
231        CHECK(VO_ERR_NONE == mApiHandle->SetInputData(mEncoderHandle,&inputData));
232    }
233
234    CHECK(mInputBuffer != NULL);
235
236    VO_CODECBUFFER outputData;
237    memset(&outputData, 0, sizeof(outputData));
238    VO_AUDIO_OUTPUTINFO outputInfo;
239    memset(&outputInfo, 0, sizeof(outputInfo));
240
241    VO_U32 ret = VO_ERR_NONE;
242    int32_t outputLength = 0;
243    outputData.Buffer = outPtr;
244    outputData.Length = buffer->size();
245    ret = mApiHandle->GetOutputData(mEncoderHandle, &outputData, &outputInfo);
246    if (ret == VO_ERR_NONE || ret == VO_ERR_INPUT_BUFFER_SMALL) {
247        outputLength += outputData.Length;
248        if (ret == VO_ERR_INPUT_BUFFER_SMALL) {  // All done
249            mInputBuffer->release();
250            mInputBuffer = NULL;
251        }
252    } else {
253        LOGE("failed to encode the input data 0x%lx", ret);
254    }
255
256    buffer->set_range(0, outputLength);
257
258    // Each output frame compresses 1024 input PCM samples.
259    int64_t timestampUs = ((mFrameCount - 1) * 1000000LL * 1024) / mSampleRate;
260    ++mFrameCount;
261    buffer->meta_data()->setInt64(kKeyTime, timestampUs);
262
263    *out = buffer;
264    return OK;
265}
266
267}  // namespace android
268