420 lines
11 KiB
C++
420 lines
11 KiB
C++
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#define LOG_TAG "AMRExtractor"
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#include <utils/Log.h>
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#include <inttypes.h>
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#include "AMRExtractor.h"
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#include <media/stagefright/foundation/ADebug.h>
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#include <media/stagefright/MediaBufferGroup.h>
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#include <media/stagefright/MediaDefs.h>
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#include <media/stagefright/MediaErrors.h>
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#include <media/stagefright/MetaData.h>
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#include <utils/String8.h>
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namespace android {
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class AMRSource : public MediaTrackHelper {
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public:
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AMRSource(
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DataSourceHelper *source,
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AMediaFormat *meta,
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bool isWide,
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const off64_t *offset_table,
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size_t offset_table_length);
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virtual media_status_t start();
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virtual media_status_t stop();
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virtual media_status_t getFormat(AMediaFormat *);
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virtual media_status_t read(
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MediaBufferHelper **buffer, const ReadOptions *options = NULL);
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protected:
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virtual ~AMRSource();
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private:
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DataSourceHelper *mDataSource;
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AMediaFormat *mMeta;
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bool mIsWide;
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off64_t mOffset;
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int64_t mCurrentTimeUs;
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bool mStarted;
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MediaBufferGroup *mGroup;
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off64_t mOffsetTable[OFFSET_TABLE_LEN];
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size_t mOffsetTableLength;
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AMRSource(const AMRSource &);
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AMRSource &operator=(const AMRSource &);
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};
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////////////////////////////////////////////////////////////////////////////////
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static size_t getFrameSize(bool isWide, unsigned FT) {
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static const size_t kFrameSizeNB[16] = {
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95, 103, 118, 134, 148, 159, 204, 244,
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39, 43, 38, 37, // SID
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0, 0, 0, // future use
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0 // no data
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};
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static const size_t kFrameSizeWB[16] = {
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132, 177, 253, 285, 317, 365, 397, 461, 477,
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40, // SID
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0, 0, 0, 0, // future use
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0, // speech lost
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0 // no data
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};
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if (FT > 15 || (isWide && FT > 9 && FT < 14) || (!isWide && FT > 11 && FT < 15)) {
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ALOGE("illegal AMR frame type %d", FT);
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return 0;
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}
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size_t frameSize = isWide ? kFrameSizeWB[FT] : kFrameSizeNB[FT];
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// Round up bits to bytes and add 1 for the header byte.
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frameSize = (frameSize + 7) / 8 + 1;
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return frameSize;
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}
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static media_status_t getFrameSizeByOffset(DataSourceHelper *source,
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off64_t offset, bool isWide, size_t *frameSize) {
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uint8_t header;
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ssize_t count = source->readAt(offset, &header, 1);
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if (count == 0) {
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return AMEDIA_ERROR_END_OF_STREAM;
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} else if (count < 0) {
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return AMEDIA_ERROR_IO;
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}
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unsigned FT = (header >> 3) & 0x0f;
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*frameSize = getFrameSize(isWide, FT);
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if (*frameSize == 0) {
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return AMEDIA_ERROR_MALFORMED;
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}
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return AMEDIA_OK;
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}
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static bool SniffAMR(
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DataSourceHelper *source, bool *isWide, float *confidence) {
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char header[9];
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if (source->readAt(0, header, sizeof(header)) != sizeof(header)) {
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return false;
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}
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if (!memcmp(header, "#!AMR\n", 6)) {
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if (isWide != nullptr) {
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*isWide = false;
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}
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*confidence = 0.5;
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return true;
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} else if (!memcmp(header, "#!AMR-WB\n", 9)) {
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if (isWide != nullptr) {
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*isWide = true;
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}
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*confidence = 0.5;
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return true;
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}
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return false;
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}
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AMRExtractor::AMRExtractor(DataSourceHelper *source)
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: mDataSource(source),
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mMeta(NULL),
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mInitCheck(NO_INIT),
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mOffsetTableLength(0) {
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float confidence;
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if (!SniffAMR(mDataSource, &mIsWide, &confidence)) {
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return;
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}
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mMeta = AMediaFormat_new();
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AMediaFormat_setString(mMeta, AMEDIAFORMAT_KEY_MIME,
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mIsWide ? MEDIA_MIMETYPE_AUDIO_AMR_WB : MEDIA_MIMETYPE_AUDIO_AMR_NB);
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AMediaFormat_setInt32(mMeta, AMEDIAFORMAT_KEY_CHANNEL_COUNT, 1);
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AMediaFormat_setInt32(mMeta, AMEDIAFORMAT_KEY_SAMPLE_RATE, mIsWide ? 16000 : 8000);
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off64_t offset = mIsWide ? 9 : 6;
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off64_t streamSize;
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size_t frameSize, numFrames = 0;
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int64_t duration = 0;
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if (mDataSource->getSize(&streamSize) == OK) {
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while (offset < streamSize) {
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status_t status = getFrameSizeByOffset(source, offset, mIsWide, &frameSize);
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if (status == ERROR_END_OF_STREAM) {
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break;
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} else if (status != OK) {
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return;
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}
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if ((numFrames % 50 == 0) && (numFrames / 50 < OFFSET_TABLE_LEN)) {
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CHECK_EQ(mOffsetTableLength, numFrames / 50);
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mOffsetTable[mOffsetTableLength] = offset - (mIsWide ? 9: 6);
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mOffsetTableLength ++;
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}
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offset += frameSize;
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duration += 20000; // Each frame is 20ms
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numFrames ++;
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}
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AMediaFormat_setInt64(mMeta, AMEDIAFORMAT_KEY_DURATION, duration);
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}
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mInitCheck = OK;
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}
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AMRExtractor::~AMRExtractor() {
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delete mDataSource;
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if (mMeta) {
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AMediaFormat_delete(mMeta);
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}
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}
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media_status_t AMRExtractor::getMetaData(AMediaFormat *meta) {
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AMediaFormat_clear(meta);
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if (mInitCheck == OK) {
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AMediaFormat_setString(meta,
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AMEDIAFORMAT_KEY_MIME, mIsWide ? MEDIA_MIMETYPE_AUDIO_AMR_WB : "audio/amr");
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}
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return AMEDIA_OK;
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}
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size_t AMRExtractor::countTracks() {
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return mInitCheck == OK ? 1 : 0;
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}
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MediaTrackHelper *AMRExtractor::getTrack(size_t index) {
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if (mInitCheck != OK || index != 0) {
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return NULL;
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}
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return new AMRSource(mDataSource, mMeta, mIsWide,
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mOffsetTable, mOffsetTableLength);
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}
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media_status_t AMRExtractor::getTrackMetaData(AMediaFormat *meta, size_t index, uint32_t /* flags */) {
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if (mInitCheck != OK || index != 0) {
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return AMEDIA_ERROR_UNKNOWN;
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}
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return AMediaFormat_copy(meta, mMeta);
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}
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////////////////////////////////////////////////////////////////////////////////
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AMRSource::AMRSource(
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DataSourceHelper *source, AMediaFormat *meta,
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bool isWide, const off64_t *offset_table, size_t offset_table_length)
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: mDataSource(source),
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mMeta(meta),
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mIsWide(isWide),
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mOffset(mIsWide ? 9 : 6),
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mCurrentTimeUs(0),
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mStarted(false),
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mGroup(NULL),
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mOffsetTableLength(offset_table_length) {
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if (mOffsetTableLength > 0 && mOffsetTableLength <= OFFSET_TABLE_LEN) {
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memcpy ((char*)mOffsetTable, (char*)offset_table, sizeof(off64_t) * mOffsetTableLength);
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}
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}
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AMRSource::~AMRSource() {
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if (mStarted) {
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stop();
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}
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}
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media_status_t AMRSource::start() {
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CHECK(!mStarted);
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mOffset = mIsWide ? 9 : 6;
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mCurrentTimeUs = 0;
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mBufferGroup->add_buffer(128);
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mStarted = true;
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return AMEDIA_OK;
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}
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media_status_t AMRSource::stop() {
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CHECK(mStarted);
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mStarted = false;
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return AMEDIA_OK;
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}
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media_status_t AMRSource::getFormat(AMediaFormat *meta) {
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return AMediaFormat_copy(meta, mMeta);
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}
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media_status_t AMRSource::read(
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MediaBufferHelper **out, const ReadOptions *options) {
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*out = NULL;
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int64_t seekTimeUs;
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ReadOptions::SeekMode mode;
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if (mOffsetTableLength > 0 && options && options->getSeekTo(&seekTimeUs, &mode)) {
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size_t size;
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const int64_t frameDurationUs = 20000LL; // 20ms per frame.
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int64_t seekFrame = 0;
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switch(mode & 0x7) {
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case ReadOptions::SEEK_NEXT_SYNC:
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seekFrame = (seekTimeUs + frameDurationUs - 1) / frameDurationUs;
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break;
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case ReadOptions::SEEK_CLOSEST_SYNC:
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case ReadOptions::SEEK_CLOSEST:
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seekFrame = (seekTimeUs + frameDurationUs/2) / frameDurationUs;
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break;
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case ReadOptions::SEEK_PREVIOUS_SYNC:
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default:
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seekFrame = seekTimeUs / frameDurationUs;
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break;
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}
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mCurrentTimeUs = seekFrame * frameDurationUs;
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size_t index = seekFrame < 0 ? 0 : seekFrame / 50;
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if (index >= mOffsetTableLength) {
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index = mOffsetTableLength - 1;
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}
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mOffset = mOffsetTable[index] + (mIsWide ? 9 : 6);
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for (size_t i = 0; i< seekFrame - index * 50; i++) {
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media_status_t err;
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if ((err = getFrameSizeByOffset(mDataSource, mOffset,
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mIsWide, &size)) != OK) {
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return err;
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}
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mOffset += size;
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}
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}
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uint8_t header;
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ssize_t n = mDataSource->readAt(mOffset, &header, 1);
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if (n < 1) {
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return AMEDIA_ERROR_END_OF_STREAM;
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}
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if (header & 0x83) {
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// Padding bits must be 0.
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ALOGE("padding bits must be 0, header is 0x%02x", header);
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return AMEDIA_ERROR_MALFORMED;
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}
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unsigned FT = (header >> 3) & 0x0f;
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size_t frameSize = getFrameSize(mIsWide, FT);
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if (frameSize == 0) {
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return AMEDIA_ERROR_MALFORMED;
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}
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MediaBufferHelper *buffer;
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status_t err = mBufferGroup->acquire_buffer(&buffer);
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if (err != OK) {
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return AMEDIA_ERROR_UNKNOWN;
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}
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n = mDataSource->readAt(mOffset, buffer->data(), frameSize);
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if (n != (ssize_t)frameSize) {
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buffer->release();
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buffer = NULL;
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if (n < 0) {
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return AMEDIA_ERROR_IO;
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} else {
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// only partial frame is available, treat it as EOS.
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mOffset += n;
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return AMEDIA_ERROR_END_OF_STREAM;
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}
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}
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buffer->set_range(0, frameSize);
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AMediaFormat *meta = buffer->meta_data();
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AMediaFormat_setInt64(meta, AMEDIAFORMAT_KEY_TIME_US, mCurrentTimeUs);
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AMediaFormat_setInt32(meta, AMEDIAFORMAT_KEY_IS_SYNC_FRAME, 1);
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mOffset += frameSize;
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mCurrentTimeUs += 20000; // Each frame is 20ms
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*out = buffer;
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return AMEDIA_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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static const char *extensions[] = {
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"amr",
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"awb",
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NULL
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};
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extern "C" {
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// This is the only symbol that needs to be exported
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__attribute__ ((visibility ("default")))
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ExtractorDef GETEXTRACTORDEF() {
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return {
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EXTRACTORDEF_VERSION,
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UUID("c86639c9-2f31-40ac-a715-fa01b4493aaf"),
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1,
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"AMR Extractor",
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{
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.v3 = {
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[](
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CDataSource *source,
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float *confidence,
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void **,
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FreeMetaFunc *) -> CreatorFunc {
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DataSourceHelper helper(source);
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if (SniffAMR(&helper, nullptr, confidence)) {
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return [](
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CDataSource *source,
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void *) -> CMediaExtractor* {
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return wrap(new AMRExtractor(new DataSourceHelper(source)));};
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}
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return NULL;
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},
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extensions
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},
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},
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};
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}
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} // extern "C"
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} // namespace android
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