| /* |
| * Copyright (C) 2009 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "AMRNBEncoder.h" |
| |
| #include "gsmamr_enc.h" |
| |
| #include <media/stagefright/MediaBufferGroup.h> |
| #include <media/stagefright/MediaDebug.h> |
| #include <media/stagefright/MediaDefs.h> |
| #include <media/stagefright/MediaErrors.h> |
| #include <media/stagefright/MetaData.h> |
| |
| namespace android { |
| |
| static const int32_t kNumSamplesPerFrame = 160; |
| static const int32_t kSampleRate = 8000; |
| |
| AMRNBEncoder::AMRNBEncoder(const sp<MediaSource> &source, const sp<MetaData> &meta) |
| : mSource(source), |
| mMeta(meta), |
| mStarted(false), |
| mBufferGroup(NULL), |
| mEncState(NULL), |
| mSidState(NULL), |
| mAnchorTimeUs(0), |
| mNumFramesOutput(0), |
| mInputBuffer(NULL), |
| mMode(MR475), |
| mNumInputSamples(0) { |
| } |
| |
| AMRNBEncoder::~AMRNBEncoder() { |
| if (mStarted) { |
| stop(); |
| } |
| } |
| |
| static Mode PickModeFromBitrate(int32_t bps) { |
| if (bps <= 4750) { |
| return MR475; |
| } else if (bps <= 5150) { |
| return MR515; |
| } else if (bps <= 5900) { |
| return MR59; |
| } else if (bps <= 6700) { |
| return MR67; |
| } else if (bps <= 7400) { |
| return MR74; |
| } else if (bps <= 7950) { |
| return MR795; |
| } else if (bps <= 10200) { |
| return MR102; |
| } else { |
| return MR122; |
| } |
| } |
| |
| status_t AMRNBEncoder::start(MetaData *params) { |
| if (mStarted) { |
| LOGW("Call start() when encoder already started"); |
| return OK; |
| } |
| |
| mBufferGroup = new MediaBufferGroup; |
| mBufferGroup->add_buffer(new MediaBuffer(32)); |
| |
| CHECK_EQ(AMREncodeInit( |
| &mEncState, &mSidState, false /* dtx_enable */), |
| 0); |
| |
| status_t err = mSource->start(params); |
| if (err != OK) { |
| LOGE("AudioSource is not available"); |
| return err; |
| } |
| |
| mAnchorTimeUs = 0; |
| mNumFramesOutput = 0; |
| mStarted = true; |
| mNumInputSamples = 0; |
| |
| int32_t bitrate; |
| if (params && params->findInt32(kKeyBitRate, &bitrate)) { |
| mMode = PickModeFromBitrate(bitrate); |
| } else { |
| mMode = MR475; |
| } |
| |
| return OK; |
| } |
| |
| status_t AMRNBEncoder::stop() { |
| if (!mStarted) { |
| LOGW("Call stop() when encoder has not started."); |
| return OK; |
| } |
| |
| if (mInputBuffer) { |
| mInputBuffer->release(); |
| mInputBuffer = NULL; |
| } |
| |
| delete mBufferGroup; |
| mBufferGroup = NULL; |
| |
| mSource->stop(); |
| |
| AMREncodeExit(&mEncState, &mSidState); |
| mEncState = mSidState = NULL; |
| |
| mStarted = false; |
| |
| return OK; |
| } |
| |
| sp<MetaData> AMRNBEncoder::getFormat() { |
| sp<MetaData> srcFormat = mSource->getFormat(); |
| |
| mMeta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_AMR_NB); |
| |
| int64_t durationUs; |
| if (srcFormat->findInt64(kKeyDuration, &durationUs)) { |
| mMeta->setInt64(kKeyDuration, durationUs); |
| } |
| |
| mMeta->setCString(kKeyDecoderComponent, "AMRNBEncoder"); |
| |
| return mMeta; |
| } |
| |
| status_t AMRNBEncoder::read( |
| MediaBuffer **out, const ReadOptions *options) { |
| status_t err; |
| |
| *out = NULL; |
| |
| int64_t seekTimeUs; |
| ReadOptions::SeekMode mode; |
| CHECK(options == NULL || !options->getSeekTo(&seekTimeUs, &mode)); |
| bool readFromSource = false; |
| int64_t wallClockTimeUs = -1; |
| |
| while (mNumInputSamples < kNumSamplesPerFrame) { |
| if (mInputBuffer == NULL) { |
| err = mSource->read(&mInputBuffer, options); |
| |
| if (err != OK) { |
| if (mNumInputSamples == 0) { |
| return ERROR_END_OF_STREAM; |
| } |
| memset(&mInputFrame[mNumInputSamples], |
| 0, |
| sizeof(int16_t) |
| * (kNumSamplesPerFrame - mNumInputSamples)); |
| mNumInputSamples = kNumSamplesPerFrame; |
| break; |
| } |
| |
| size_t align = mInputBuffer->range_length() % sizeof(int16_t); |
| CHECK_EQ(align, 0); |
| readFromSource = true; |
| |
| int64_t timeUs; |
| if (mInputBuffer->meta_data()->findInt64(kKeyDriftTime, &timeUs)) { |
| wallClockTimeUs = timeUs; |
| } |
| if (mInputBuffer->meta_data()->findInt64(kKeyAnchorTime, &timeUs)) { |
| mAnchorTimeUs = timeUs; |
| } |
| } else { |
| readFromSource = false; |
| } |
| |
| size_t copy = |
| (kNumSamplesPerFrame - mNumInputSamples) * sizeof(int16_t); |
| |
| if (copy > mInputBuffer->range_length()) { |
| copy = mInputBuffer->range_length(); |
| } |
| |
| memcpy(&mInputFrame[mNumInputSamples], |
| (const uint8_t *)mInputBuffer->data() |
| + mInputBuffer->range_offset(), |
| copy); |
| |
| mNumInputSamples += copy / sizeof(int16_t); |
| |
| mInputBuffer->set_range( |
| mInputBuffer->range_offset() + copy, |
| mInputBuffer->range_length() - copy); |
| |
| if (mInputBuffer->range_length() == 0) { |
| mInputBuffer->release(); |
| mInputBuffer = NULL; |
| } |
| } |
| |
| MediaBuffer *buffer; |
| CHECK_EQ(mBufferGroup->acquire_buffer(&buffer), OK); |
| |
| uint8_t *outPtr = (uint8_t *)buffer->data(); |
| |
| Frame_Type_3GPP frameType; |
| int res = AMREncode( |
| mEncState, mSidState, (Mode)mMode, |
| mInputFrame, outPtr, &frameType, AMR_TX_WMF); |
| |
| CHECK(res >= 0); |
| CHECK((size_t)res < buffer->size()); |
| |
| // Convert header byte from WMF to IETF format. |
| outPtr[0] = ((outPtr[0] << 3) | 4) & 0x7c; |
| |
| buffer->set_range(0, res); |
| |
| // Each frame of 160 samples is 20ms long. |
| int64_t mediaTimeUs = mNumFramesOutput * 20000LL; |
| buffer->meta_data()->setInt64( |
| kKeyTime, mAnchorTimeUs + mediaTimeUs); |
| |
| if (readFromSource && wallClockTimeUs != -1) { |
| buffer->meta_data()->setInt64(kKeyDriftTime, |
| mediaTimeUs - wallClockTimeUs); |
| } |
| |
| ++mNumFramesOutput; |
| |
| *out = buffer; |
| |
| mNumInputSamples = 0; |
| |
| return OK; |
| } |
| |
| } // namespace android |