| /* |
| * 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 "AMRNBDecoder.h" |
| |
| #include "gsmamr_dec.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; |
| |
| AMRNBDecoder::AMRNBDecoder(const sp<MediaSource> &source) |
| : mSource(source), |
| mStarted(false), |
| mBufferGroup(NULL), |
| mState(NULL), |
| mAnchorTimeUs(0), |
| mNumSamplesOutput(0), |
| mInputBuffer(NULL) { |
| } |
| |
| AMRNBDecoder::~AMRNBDecoder() { |
| if (mStarted) { |
| stop(); |
| } |
| } |
| |
| status_t AMRNBDecoder::start(MetaData *params) { |
| CHECK(!mStarted); |
| |
| mBufferGroup = new MediaBufferGroup; |
| mBufferGroup->add_buffer( |
| new MediaBuffer(kNumSamplesPerFrame * sizeof(int16_t))); |
| |
| CHECK_EQ(GSMInitDecode(&mState, (Word8 *)"AMRNBDecoder"), 0); |
| |
| mSource->start(); |
| |
| mAnchorTimeUs = 0; |
| mNumSamplesOutput = 0; |
| mStarted = true; |
| |
| return OK; |
| } |
| |
| status_t AMRNBDecoder::stop() { |
| CHECK(mStarted); |
| |
| if (mInputBuffer) { |
| mInputBuffer->release(); |
| mInputBuffer = NULL; |
| } |
| |
| delete mBufferGroup; |
| mBufferGroup = NULL; |
| |
| GSMDecodeFrameExit(&mState); |
| |
| mSource->stop(); |
| |
| mStarted = false; |
| |
| return OK; |
| } |
| |
| sp<MetaData> AMRNBDecoder::getFormat() { |
| sp<MetaData> srcFormat = mSource->getFormat(); |
| |
| int32_t numChannels; |
| int32_t sampleRate; |
| |
| CHECK(srcFormat->findInt32(kKeyChannelCount, &numChannels)); |
| CHECK_EQ(numChannels, 1); |
| |
| CHECK(srcFormat->findInt32(kKeySampleRate, &sampleRate)); |
| CHECK_EQ(sampleRate, kSampleRate); |
| |
| sp<MetaData> meta = new MetaData; |
| meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW); |
| meta->setInt32(kKeyChannelCount, numChannels); |
| meta->setInt32(kKeySampleRate, sampleRate); |
| |
| int64_t durationUs; |
| if (srcFormat->findInt64(kKeyDuration, &durationUs)) { |
| meta->setInt64(kKeyDuration, durationUs); |
| } |
| |
| meta->setCString(kKeyDecoderComponent, "AMRNBDecoder"); |
| |
| return meta; |
| } |
| |
| status_t AMRNBDecoder::read( |
| MediaBuffer **out, const ReadOptions *options) { |
| status_t err; |
| |
| *out = NULL; |
| |
| int64_t seekTimeUs; |
| ReadOptions::SeekMode mode; |
| if (options && options->getSeekTo(&seekTimeUs, &mode)) { |
| CHECK(seekTimeUs >= 0); |
| |
| mNumSamplesOutput = 0; |
| |
| if (mInputBuffer) { |
| mInputBuffer->release(); |
| mInputBuffer = NULL; |
| } |
| } else { |
| seekTimeUs = -1; |
| } |
| |
| if (mInputBuffer == NULL) { |
| err = mSource->read(&mInputBuffer, options); |
| |
| if (err != OK) { |
| return err; |
| } |
| |
| int64_t timeUs; |
| if (mInputBuffer->meta_data()->findInt64(kKeyTime, &timeUs)) { |
| mAnchorTimeUs = timeUs; |
| mNumSamplesOutput = 0; |
| } else { |
| // We must have a new timestamp after seeking. |
| CHECK(seekTimeUs < 0); |
| } |
| } |
| |
| MediaBuffer *buffer; |
| CHECK_EQ(mBufferGroup->acquire_buffer(&buffer), OK); |
| |
| const uint8_t *inputPtr = |
| (const uint8_t *)mInputBuffer->data() + mInputBuffer->range_offset(); |
| |
| size_t numBytesRead = |
| AMRDecode(mState, |
| (Frame_Type_3GPP)((inputPtr[0] >> 3) & 0x0f), |
| (UWord8 *)&inputPtr[1], |
| static_cast<int16_t *>(buffer->data()), |
| MIME_IETF); |
| |
| ++numBytesRead; // Include the frame type header byte. |
| |
| buffer->set_range(0, kNumSamplesPerFrame * sizeof(int16_t)); |
| |
| if (numBytesRead > mInputBuffer->range_length()) { |
| // This is bad, should never have happened, but did. Abort now. |
| |
| buffer->release(); |
| buffer = NULL; |
| |
| return ERROR_MALFORMED; |
| } |
| |
| mInputBuffer->set_range( |
| mInputBuffer->range_offset() + numBytesRead, |
| mInputBuffer->range_length() - numBytesRead); |
| |
| if (mInputBuffer->range_length() == 0) { |
| mInputBuffer->release(); |
| mInputBuffer = NULL; |
| } |
| |
| buffer->meta_data()->setInt64( |
| kKeyTime, |
| mAnchorTimeUs |
| + (mNumSamplesOutput * 1000000) / kSampleRate); |
| |
| mNumSamplesOutput += kNumSamplesPerFrame; |
| |
| *out = buffer; |
| |
| return OK; |
| } |
| |
| } // namespace android |