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AMRExtractor.cpp
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AMRExtractor.cpp
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/*
* Copyright (C) 2014 MediaTek Inc.
* Modification based on code covered by the mentioned copyright
* and/or permission notice(s).
*/
/*
* 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 "AMRExtractor"
#include <utils/Log.h>
#ifdef MTK_AOSP_ENHANCEMENT
#include <cutils/xlog.h>
#endif
#include "include/AMRExtractor.h"
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/DataSource.h>
#include <media/stagefright/MediaBufferGroup.h>
#include <media/stagefright/MediaDefs.h>
#include <media/stagefright/MediaErrors.h>
#include <media/stagefright/MediaSource.h>
#include <media/stagefright/MetaData.h>
#include <utils/String8.h>
namespace android {
class AMRSource : public MediaSource {
public:
AMRSource(const sp<DataSource> &source,
const sp<MetaData> &meta,
bool isWide,
const off64_t *offset_table,
size_t offset_table_length);
virtual status_t start(MetaData *params = NULL);
virtual status_t stop();
virtual sp<MetaData> getFormat();
virtual status_t read(
MediaBuffer **buffer, const ReadOptions *options = NULL);
protected:
virtual ~AMRSource();
private:
sp<DataSource> mDataSource;
sp<MetaData> mMeta;
bool mIsWide;
off64_t mOffset;
int64_t mCurrentTimeUs;
bool mStarted;
MediaBufferGroup *mGroup;
off64_t mOffsetTable[OFFSET_TABLE_LEN];
size_t mOffsetTableLength;
AMRSource(const AMRSource &);
AMRSource &operator=(const AMRSource &);
};
////////////////////////////////////////////////////////////////////////////////
#ifdef MTK_AOSP_ENHANCEMENT
static size_t getFrameSize(bool isWide, unsigned FT) {
static const size_t kFrameSizeNB[16] = {
13, 14, 16, 18, 20, 21, 27, 32, 6, 7, 6, 6, 1, 1, 1, 1
};
static const size_t kFrameSizeWB[16] = {
18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 1, 1, 1, 1, 1, 1
};
if (FT > 15) {
SXLOGE("illegal AMR frame type %d", FT);
return 0;
}
return isWide ? kFrameSizeWB[FT] : kFrameSizeNB[FT];
}
#else
static size_t getFrameSize(bool isWide, unsigned FT) {
static const size_t kFrameSizeNB[16] = {
95, 103, 118, 134, 148, 159, 204, 244,
39, 43, 38, 37, // SID
0, 0, 0, // future use
0 // no data
};
static const size_t kFrameSizeWB[16] = {
132, 177, 253, 285, 317, 365, 397, 461, 477,
40, // SID
0, 0, 0, 0, // future use
0, // speech lost
0 // no data
};
if (FT > 15 || (isWide && FT > 9 && FT < 14) || (!isWide && FT > 11 && FT < 15)) {
ALOGE("illegal AMR frame type %d", FT);
return 0;
}
size_t frameSize = isWide ? kFrameSizeWB[FT] : kFrameSizeNB[FT];
// Round up bits to bytes and add 1 for the header byte.
frameSize = (frameSize + 7) / 8 + 1;
return frameSize;
}
#endif
#ifdef MTK_AOSP_ENHANCEMENT
static const unsigned int Buffer_Count_Readed = 1024;
static status_t getFrameSizeByOffset(const sp<DataSource> &source,
off64_t &offset, bool isWide, size_t *frameSize) {
uint8_t header;
int count = 0;
if (source->readAt(offset, &header, 1) < 1) {
return ERROR_END_OF_STREAM;
}
while(header & 0x83)
{
//SXLOGV("getFrameSizeByOffset--Frame head error,skip until to find an valid one");
offset++;
count++;
if (count>320) {
SXLOGW("getFrameSizeByOffset--can not find the correct frame header in 64 byte");
return ERROR_END_OF_STREAM;
}
ssize_t n = source->readAt(offset, &header, 1);
if (n < 1) {
return ERROR_END_OF_STREAM;
}
}
unsigned FT = (header >> 3) & 0x0f;
*frameSize = getFrameSize(isWide, FT);
if (*frameSize == 0) {
return ERROR_MALFORMED;
}
return OK;
}
static status_t getFrameSizeByOffset_MMIO(uint8_t *buf, ssize_t &data_length, size_t &data_offset,
off64_t &offset, bool isWide, size_t *frameSize) {
uint8_t header = 0;
int count = 0;
if (data_length < 1) {
return ERROR_END_OF_STREAM;
}
if (buf && data_offset<Buffer_Count_Readed) {
header = *(buf+data_offset);
}else {
return NO_MEMORY;
}
while(header & 0x83)
{
offset++;
count++;
data_offset++;
data_length--;
if (count>320) {
SXLOGW("getFrameSizeByOffset--can not find the correct frame header in 64 byte");
return ERROR_END_OF_STREAM;
}
if (data_length>1 && data_offset<Buffer_Count_Readed) {
header = *(buf+data_offset);
}else {
return NO_MEMORY;
}
}
unsigned FT = (header >> 3) & 0x0f;
*frameSize = getFrameSize(isWide, FT);
if (*frameSize == 0) {
return ERROR_MALFORMED;
}else if(*frameSize < data_length){
data_length -= *frameSize;
data_offset += *frameSize;
}else {
data_length = 0;
}
return OK;
}
#else
static status_t getFrameSizeByOffset(const sp<DataSource> &source,
off64_t offset, bool isWide, size_t *frameSize) {
uint8_t header;
if (source->readAt(offset, &header, 1) < 1) {
return ERROR_IO;
}
unsigned FT = (header >> 3) & 0x0f;
*frameSize = getFrameSize(isWide, FT);
if (*frameSize == 0) {
return ERROR_MALFORMED;
}
return OK;
}
#endif
AMRExtractor::AMRExtractor(const sp<DataSource> &source)
: mDataSource(source),
mInitCheck(NO_INIT),
mOffsetTableLength(0) {
String8 mimeType;
float confidence;
if (!SniffAMR(mDataSource, &mimeType, &confidence, NULL)) {
return;
}
mIsWide = (mimeType == MEDIA_MIMETYPE_AUDIO_AMR_WB);
mMeta = new MetaData;
mMeta->setCString(
kKeyMIMEType, mIsWide ? MEDIA_MIMETYPE_AUDIO_AMR_WB
: MEDIA_MIMETYPE_AUDIO_AMR_NB);
mMeta->setInt32(kKeyChannelCount, 1);
mMeta->setInt32(kKeySampleRate, mIsWide ? 16000 : 8000);
off64_t offset = mIsWide ? 9 : 6;
off64_t streamSize;
size_t frameSize, numFrames = 0;
int64_t duration = 0;
#ifdef MTK_AOSP_ENHANCEMENT
status_t ret = 0;
bool streamingFlag = mDataSource->flags() & DataSource::kIsCachingDataSource;
char *pData = new char [Buffer_Count_Readed];
ssize_t dataLen = 0;
size_t dataOffset = 0;
SXLOGD("AMRExtractor--is streaming flag=%d, pData:0x%x", streamingFlag, pData);
#endif
if (mDataSource->getSize(&streamSize) == OK) {
while (offset < streamSize) {
#ifdef MTK_AOSP_ENHANCEMENT
if (pData) {
if (dataLen==0) {
dataLen = mDataSource->readAt(offset, (void *)pData, Buffer_Count_Readed);
if (dataLen < 0) {
return;
}
dataOffset = 0;
}
ret = getFrameSizeByOffset_MMIO((uint8_t *)pData, dataLen, dataOffset, offset, mIsWide, &frameSize);
if (ret==NO_MEMORY) {
dataLen = 0;
continue;
}
}else {
ret = getFrameSizeByOffset(source, offset, mIsWide, &frameSize);
}
if (ret==ERROR_END_OF_STREAM) {
break;
}else if(ret!=OK) {
if (pData) delete [] pData;
pData = 0;
SXLOGD("AMRExtractor--getFrameSizeByOffset is not ok!");
return;
}
#else
if (getFrameSizeByOffset(source, offset, mIsWide, &frameSize) != OK) {
return;
}
#endif
if ((numFrames % 50 == 0) && (numFrames / 50 < OFFSET_TABLE_LEN)) {
CHECK_EQ(mOffsetTableLength, numFrames / 50);
mOffsetTable[mOffsetTableLength] = offset - (mIsWide ? 9: 6);
mOffsetTableLength ++;
}
#ifdef MTK_AOSP_ENHANCEMENT
else if(streamingFlag&&(numFrames>=50*OFFSET_TABLE_LEN)) {
duration += 20000*(streamSize - offset)/((offset - (mIsWide ? 9: 6))/(off64_t)numFrames);
SXLOGV("AMRExtractor--end duration=%lld, frame size = %lld", duration, (offset - (mIsWide ? 9: 6))/(off64_t)numFrames);
break;
}
#endif
offset += frameSize;
duration += 20000; // Each frame is 20ms
numFrames ++;
}
mMeta->setInt64(kKeyDuration, duration);
}
#ifdef MTK_AOSP_ENHANCEMENT
if (pData) delete [] pData;
pData = 0;
SXLOGD("AMRExtractor--constructor out -");
#endif
mInitCheck = OK;
}
AMRExtractor::~AMRExtractor() {
}
sp<MetaData> AMRExtractor::getMetaData() {
sp<MetaData> meta = new MetaData;
if (mInitCheck != OK) {
return meta;
}
meta->setCString(kKeyMIMEType, mIsWide ? "audio/amr-wb" : "audio/amr");
return meta;
}
size_t AMRExtractor::countTracks() {
return mInitCheck == OK ? 1 : 0;
}
sp<MediaSource> AMRExtractor::getTrack(size_t index) {
if (mInitCheck != OK || index != 0) {
return NULL;
}
return new AMRSource(mDataSource, mMeta, mIsWide,
mOffsetTable, mOffsetTableLength);
}
sp<MetaData> AMRExtractor::getTrackMetaData(size_t index, uint32_t /* flags */) {
if (mInitCheck != OK || index != 0) {
return NULL;
}
return mMeta;
}
////////////////////////////////////////////////////////////////////////////////
AMRSource::AMRSource(
const sp<DataSource> &source, const sp<MetaData> &meta,
bool isWide, const off64_t *offset_table, size_t offset_table_length)
: mDataSource(source),
mMeta(meta),
mIsWide(isWide),
mOffset(mIsWide ? 9 : 6),
mCurrentTimeUs(0),
mStarted(false),
mGroup(NULL),
mOffsetTableLength(offset_table_length) {
if (mOffsetTableLength > 0 && mOffsetTableLength <= OFFSET_TABLE_LEN) {
memcpy ((char*)mOffsetTable, (char*)offset_table, sizeof(off64_t) * mOffsetTableLength);
}
}
AMRSource::~AMRSource() {
if (mStarted) {
stop();
}
}
status_t AMRSource::start(MetaData * /* params */) {
CHECK(!mStarted);
mOffset = mIsWide ? 9 : 6;
mCurrentTimeUs = 0;
mGroup = new MediaBufferGroup;
mGroup->add_buffer(new MediaBuffer(128));
mStarted = true;
return OK;
}
status_t AMRSource::stop() {
CHECK(mStarted);
delete mGroup;
mGroup = NULL;
mStarted = false;
return OK;
}
sp<MetaData> AMRSource::getFormat() {
return mMeta;
}
status_t AMRSource::read(
MediaBuffer **out, const ReadOptions *options) {
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode mode;
if (options && options->getSeekTo(&seekTimeUs, &mode)) {
#ifdef MTK_AOSP_ENHANCEMENT
// Maybe risk (int)index >= (uint)mOffsetTableLength warning: comparison between signed and unsigned integer expressions
// should check seekTimeUs < 0 case
if (seekTimeUs < 0) {
ALOGW("seekTimeUs:%lld < 0", seekTimeUs);
seekTimeUs = 0;
}
#endif
size_t size;
int64_t seekFrame = seekTimeUs / 20000ll; // 20ms per frame.
mCurrentTimeUs = seekFrame * 20000ll;
size_t index = seekFrame < 0 ? 0 : seekFrame / 50;
if (index >= mOffsetTableLength) {
index = mOffsetTableLength - 1;
}
mOffset = mOffsetTable[index] + (mIsWide ? 9 : 6);
for (size_t i = 0; i< seekFrame - index * 50; i++) {
status_t err;
if ((err = getFrameSizeByOffset(mDataSource, mOffset,
mIsWide, &size)) != OK) {
return err;
}
mOffset += size;
}
}
uint8_t header;
ssize_t n = mDataSource->readAt(mOffset, &header, 1);
if (n < 1) {
return ERROR_END_OF_STREAM;
}
#ifdef MTK_AOSP_ENHANCEMENT
int count = 0;
while(header & 0x83)
{
if ((count % 10) == 0)
SXLOGW("AMRSource::read--Frame head error,skip until to find an valid one count %d",count);
mOffset++;
count++;
if (count>320) {
SXLOGW("getFrameSizeByOffset--can not find the correct frame header in 64 byte");
return ERROR_END_OF_STREAM;
}
n = mDataSource->readAt(mOffset, &header, 1);
if (n < 1) {
return ERROR_END_OF_STREAM;
}
}
#else
if (header & 0x83) {
// Padding bits must be 0.
ALOGE("padding bits must be 0, header is 0x%02x", header);
return ERROR_MALFORMED;
}
#endif
unsigned FT = (header >> 3) & 0x0f;
size_t frameSize = getFrameSize(mIsWide, FT);
if (frameSize == 0) {
return ERROR_MALFORMED;
}
MediaBuffer *buffer;
status_t err = mGroup->acquire_buffer(&buffer);
if (err != OK) {
return err;
}
n = mDataSource->readAt(mOffset, buffer->data(), frameSize);
if (n != (ssize_t)frameSize) {
buffer->release();
buffer = NULL;
return ERROR_IO;
}
buffer->set_range(0, frameSize);
buffer->meta_data()->setInt64(kKeyTime, mCurrentTimeUs);
buffer->meta_data()->setInt32(kKeyIsSyncFrame, 1);
mOffset += frameSize;
mCurrentTimeUs += 20000; // Each frame is 20ms
*out = buffer;
return OK;
}
////////////////////////////////////////////////////////////////////////////////
bool SniffAMR(
const sp<DataSource> &source, String8 *mimeType, float *confidence,
sp<AMessage> *) {
char header[9];
if (source->readAt(0, header, sizeof(header)) != sizeof(header)) {
return false;
}
if (!memcmp(header, "#!AMR\n", 6)) {
*mimeType = MEDIA_MIMETYPE_AUDIO_AMR_NB;
*confidence = 0.5;
return true;
} else if (!memcmp(header, "#!AMR-WB\n", 9)) {
*mimeType = MEDIA_MIMETYPE_AUDIO_AMR_WB;
*confidence = 0.5;
return true;
}
return false;
}
} // namespace android