XINGSeeker.cpp revision 9e50385f34676d8fcb3b473ec4c9f5c388a4c887
14456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber/* 24456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * Copyright (C) 2010 The Android Open Source Project 34456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * 44456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 54456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * you may not use this file except in compliance with the License. 64456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * You may obtain a copy of the License at 74456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * 84456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * http://www.apache.org/licenses/LICENSE-2.0 94456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * 104456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * Unless required by applicable law or agreed to in writing, software 114456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 124456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 134456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * See the License for the specific language governing permissions and 144456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber * limitations under the License. 154456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber */ 164456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 174456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include "include/XINGSeeker.h" 189e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen#include "include/avc_utils.h" 194456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 204456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include <media/stagefright/DataSource.h> 214456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include <media/stagefright/Utils.h> 224456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 234456da54bcd206ed1f518c69cc959ca65a179c83Andreas Hubernamespace android { 244456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 254456da54bcd206ed1f518c69cc959ca65a179c83Andreas HuberXINGSeeker::XINGSeeker() 264456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber : mDurationUs(-1), 274456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber mSizeBytes(0) { 284456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 294456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 304456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huberbool XINGSeeker::getDuration(int64_t *durationUs) { 314456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (mDurationUs < 0) { 324456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return false; 334456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 344456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 354456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber *durationUs = mDurationUs; 364456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 374456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return true; 384456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 394456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 40c7fc37a3dab9bd1f96713649f351b5990e6316ffJames Dongbool XINGSeeker::getOffsetForTime(int64_t *timeUs, off64_t *pos) { 415102400104ce1f0a6de7bf913381a91e4f18a22aMarco Nelissen if (mSizeBytes == 0 || !mTOCValid || mDurationUs < 0) { 424456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return false; 434456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 444456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 454456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber float percent = (float)(*timeUs) * 100 / mDurationUs; 464456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber float fx; 474456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if( percent <= 0.0f ) { 484456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber fx = 0.0f; 494456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } else if( percent >= 100.0f ) { 504456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber fx = 256.0f; 514456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } else { 524456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber int a = (int)percent; 534456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber float fa, fb; 544456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if ( a == 0 ) { 554456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber fa = 0.0f; 564456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } else { 575102400104ce1f0a6de7bf913381a91e4f18a22aMarco Nelissen fa = (float)mTOC[a-1]; 584456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 594456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if ( a < 99 ) { 605102400104ce1f0a6de7bf913381a91e4f18a22aMarco Nelissen fb = (float)mTOC[a]; 614456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } else { 624456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber fb = 256.0f; 634456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 644456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber fx = fa + (fb-fa)*(percent-a); 654456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 664456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 674456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber *pos = (int)((1.0f/256.0f)*fx*mSizeBytes) + mFirstFramePos; 684456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 694456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return true; 704456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 714456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 729e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen// static 739e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissensp<XINGSeeker> XINGSeeker::CreateFromSource( 749e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen const sp<DataSource> &source, off64_t first_frame_pos) { 759e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen sp<XINGSeeker> seeker = new XINGSeeker; 769e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen 779e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen seeker->mFirstFramePos = first_frame_pos; 789e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen 799e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen ALOGI("xingseeker first frame pos: %lld", first_frame_pos); 809e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen 819e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen seeker->mSizeBytes = 0; 829e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen seeker->mTOCValid = false; 839e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen seeker->mDurationUs = 0; 844456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 854456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint8_t buffer[4]; 864456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber int offset = first_frame_pos; 874456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (source->readAt(offset, &buffer, 4) < 4) { // get header 889e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen return NULL; 894456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 904456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber offset += 4; 914456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 929e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen int header = U32_AT(buffer);; 939e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen size_t xingframesize = 0; 949e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen int sampling_rate = 0; 959e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen int num_channels; 969e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen int samples_per_frame = 0; 979e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen if (!GetMPEGAudioFrameSize(header, &xingframesize, &sampling_rate, &num_channels, 989e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen NULL, &samples_per_frame)) { 999e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen return NULL; 1004456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1019e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen seeker->mFirstFramePos += xingframesize; 1029e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen 1039e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen uint8_t version = (buffer[1] >> 3) & 3; 1049e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen 1054456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber // determine offset of XING header 1069e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen if(version & 1) { // mpeg1 1079e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen if (num_channels != 1) offset += 32; 1084456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber else offset += 17; 1099e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen } else { // mpeg 2 or 2.5 1109e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen if (num_channels != 1) offset += 17; 1114456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber else offset += 9; 1124456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1134456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1144456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (source->readAt(offset, &buffer, 4) < 4) { // XING header ID 1159e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen return NULL; 1164456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1174456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber offset += 4; 1184456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber // Check XING ID 1194456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if ((buffer[0] != 'X') || (buffer[1] != 'i') 1204456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber || (buffer[2] != 'n') || (buffer[3] != 'g')) { 1214456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if ((buffer[0] != 'I') || (buffer[1] != 'n') 1224456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber || (buffer[2] != 'f') || (buffer[3] != 'o')) { 1239e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen return NULL; 1244456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1254456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1264456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1274456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (source->readAt(offset, &buffer, 4) < 4) { // flags 1289e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen return NULL; 1294456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1304456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber offset += 4; 1314456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint32_t flags = U32_AT(buffer); 1324456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1334456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (flags & 0x0001) { // Frames field is present 1344456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (source->readAt(offset, buffer, 4) < 4) { 1359e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen return NULL; 1364456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1379e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen int32_t frames = U32_AT(buffer); 1389e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen seeker->mDurationUs = (int64_t)frames * samples_per_frame * 1000000LL / sampling_rate; 1394456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber offset += 4; 1404456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1414456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (flags & 0x0002) { // Bytes field is present 1429e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen if (source->readAt(offset, buffer, 4) < 4) { 1439e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen return NULL; 1444456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1459e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen seeker->mSizeBytes = U32_AT(buffer); 1464456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber offset += 4; 1474456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1484456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (flags & 0x0004) { // TOC field is present 1499e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen if (source->readAt(offset + 1, seeker->mTOC, 99) < 99) { 1509e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen return NULL; 1514456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1529e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen seeker->mTOCValid = true; 1534456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber offset += 100; 1544456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1559e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen 1569e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen#if 0 1574456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (flags & 0x0008) { // Quality indicator field is present 1589e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen if (source->readAt(offset, buffer, 4) < 4) { 1599e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen return NULL; 1604456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1619e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen // do something with the quality indicator 1629e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen offset += 4; 1634456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1649e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen#endif 1659e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen 1669e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen return seeker; 1674456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 1684456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1694456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} // namespace android 1704456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 171