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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.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "AMRNBDecoder"
#include <utils/Log.h>
#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();
int32_t numBytesRead =
AMRDecode(mState,
(Frame_Type_3GPP)((inputPtr[0] >> 3) & 0x0f),
(UWord8 *)&inputPtr[1],
static_cast<int16_t *>(buffer->data()),
MIME_IETF);
if (numBytesRead == -1 ) {
LOGE("PV AMR decoder AMRDecode() call failed");
buffer->release();
buffer = NULL;
return ERROR_MALFORMED;
}
++numBytesRead; // Include the frame type header byte.
buffer->set_range(0, kNumSamplesPerFrame * sizeof(int16_t));
if (static_cast<size_t>(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
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