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/*
* 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 "AMRWBDecoder.h"
#include "pvamrwbdecoder.h"
#include <media/stagefright/MediaBufferGroup.h>
#include <media/stagefright/MediaDebug.h>
#include <media/stagefright/MediaDefs.h>
#include <media/stagefright/MetaData.h>
namespace android {
static const int32_t kNumSamplesPerFrame = 320;
static const int32_t kSampleRate = 16000;
AMRWBDecoder::AMRWBDecoder(const sp<MediaSource> &source)
: mSource(source),
mStarted(false),
mBufferGroup(NULL),
mState(NULL),
mDecoderBuf(NULL),
mDecoderCookie(NULL),
mAnchorTimeUs(0),
mNumSamplesOutput(0),
mInputBuffer(NULL) {
}
AMRWBDecoder::~AMRWBDecoder() {
if (mStarted) {
stop();
}
}
status_t AMRWBDecoder::start(MetaData *params) {
CHECK(!mStarted);
mBufferGroup = new MediaBufferGroup;
mBufferGroup->add_buffer(
new MediaBuffer(kNumSamplesPerFrame * sizeof(int16_t)));
int32_t memReq = pvDecoder_AmrWbMemRequirements();
mDecoderBuf = malloc(memReq);
pvDecoder_AmrWb_Init(&mState, mDecoderBuf, &mDecoderCookie);
mSource->start();
mAnchorTimeUs = 0;
mNumSamplesOutput = 0;
mStarted = true;
return OK;
}
status_t AMRWBDecoder::stop() {
CHECK(mStarted);
if (mInputBuffer) {
mInputBuffer->release();
mInputBuffer = NULL;
}
delete mBufferGroup;
mBufferGroup = NULL;
free(mDecoderBuf);
mDecoderBuf = NULL;
mSource->stop();
mStarted = false;
return OK;
}
sp<MetaData> AMRWBDecoder::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, "AMRWBDecoder");
return meta;
}
static size_t getFrameSize(unsigned FT) {
static const size_t kFrameSizeWB[9] = {
132, 177, 253, 285, 317, 365, 397, 461, 477
};
size_t frameSize = kFrameSizeWB[FT];
// Round up bits to bytes and add 1 for the header byte.
frameSize = (frameSize + 7) / 8 + 1;
return frameSize;
}
status_t AMRWBDecoder::read(
MediaBuffer **out, const ReadOptions *options) {
status_t err;
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode seekMode;
if (options && options->getSeekTo(&seekTimeUs, &seekMode)) {
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();
int16 mode = ((inputPtr[0] >> 3) & 0x0f);
size_t frameSize = getFrameSize(mode);
CHECK(mInputBuffer->range_length() >= frameSize);
int16 frameType;
RX_State_wb rx_state;
mime_unsorting(
const_cast<uint8_t *>(&inputPtr[1]),
mInputSampleBuffer,
&frameType, &mode, 1, &rx_state);
int16_t *outPtr = (int16_t *)buffer->data();
int16_t numSamplesOutput;
pvDecoder_AmrWb(
mode, mInputSampleBuffer,
outPtr,
&numSamplesOutput,
mDecoderBuf, frameType, mDecoderCookie);
CHECK_EQ(numSamplesOutput, kNumSamplesPerFrame);
for (int i = 0; i < kNumSamplesPerFrame; ++i) {
/* Delete the 2 LSBs (14-bit output) */
outPtr[i] &= 0xfffC;
}
buffer->set_range(0, numSamplesOutput * sizeof(int16_t));
mInputBuffer->set_range(
mInputBuffer->range_offset() + frameSize,
mInputBuffer->range_length() - frameSize);
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
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