VBRISeeker.cpp revision 5fd7d3a23316ec0d2320fece85201859b52c2aef
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//#define LOG_NDEBUG 0 184456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#define LOG_TAG "VBRISeeker" 194456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include <utils/Log.h> 204456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 214456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include "include/VBRISeeker.h" 224456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 23386d609dc513e838c7e7c4c46c604493ccd560beAndreas Huber#include "include/avc_utils.h" 244456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include "include/MP3Extractor.h" 254456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 264456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include <media/stagefright/foundation/ADebug.h> 274456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include <media/stagefright/DataSource.h> 284456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include <media/stagefright/Utils.h> 294456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 304456da54bcd206ed1f518c69cc959ca65a179c83Andreas Hubernamespace android { 314456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 324456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huberstatic uint32_t U24_AT(const uint8_t *ptr) { 334456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return ptr[0] << 16 | ptr[1] << 8 | ptr[2]; 344456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 354456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 364456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber// static 374456da54bcd206ed1f518c69cc959ca65a179c83Andreas Hubersp<VBRISeeker> VBRISeeker::CreateFromSource( 38c7fc37a3dab9bd1f96713649f351b5990e6316ffJames Dong const sp<DataSource> &source, off64_t post_id3_pos) { 39c7fc37a3dab9bd1f96713649f351b5990e6316ffJames Dong off64_t pos = post_id3_pos; 404456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 414456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint8_t header[4]; 424456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber ssize_t n = source->readAt(pos, header, sizeof(header)); 434456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (n < (ssize_t)sizeof(header)) { 444456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return NULL; 454456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 464456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 474456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint32_t tmp = U32_AT(&header[0]); 484456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t frameSize; 494456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber int sampleRate; 50386d609dc513e838c7e7c4c46c604493ccd560beAndreas Huber if (!GetMPEGAudioFrameSize(tmp, &frameSize, &sampleRate)) { 514456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return NULL; 524456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 534456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 544456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber // VBRI header follows 32 bytes after the header _ends_. 554456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber pos += sizeof(header) + 32; 564456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 574456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint8_t vbriHeader[26]; 584456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber n = source->readAt(pos, vbriHeader, sizeof(vbriHeader)); 594456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (n < (ssize_t)sizeof(vbriHeader)) { 604456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return NULL; 614456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 624456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 634456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (memcmp(vbriHeader, "VBRI", 4)) { 644456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return NULL; 654456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 664456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 674456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t numFrames = U32_AT(&vbriHeader[14]); 684456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 694456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber int64_t durationUs = 704456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber numFrames * 1000000ll * (sampleRate >= 32000 ? 1152 : 576) / sampleRate; 714456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 723856b090cd04ba5dd4a59a12430ed724d5995909Steve Block ALOGV("duration = %.2f secs", durationUs / 1E6); 734456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 744456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t numEntries = U16_AT(&vbriHeader[18]); 754456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t entrySize = U16_AT(&vbriHeader[22]); 764456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t scale = U16_AT(&vbriHeader[20]); 774456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 783856b090cd04ba5dd4a59a12430ed724d5995909Steve Block ALOGV("%d entries, scale=%d, size_per_entry=%d", 794456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber numEntries, 804456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber scale, 814456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber entrySize); 824456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 834456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t totalEntrySize = numEntries * entrySize; 844456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint8_t *buffer = new uint8_t[totalEntrySize]; 854456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 864456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber n = source->readAt(pos + sizeof(vbriHeader), buffer, totalEntrySize); 874456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (n < (ssize_t)totalEntrySize) { 884456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber delete[] buffer; 894456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber buffer = NULL; 904456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 914456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return NULL; 924456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 934456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 944456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber sp<VBRISeeker> seeker = new VBRISeeker; 959e50385f34676d8fcb3b473ec4c9f5c388a4c887Marco Nelissen seeker->mBasePos = post_id3_pos + frameSize; 965fd7d3a23316ec0d2320fece85201859b52c2aefMarco Nelissen // only update mDurationUs if the calculated duration is valid (non zero) 975fd7d3a23316ec0d2320fece85201859b52c2aefMarco Nelissen // otherwise, leave duration at -1 so that getDuration() and getOffsetForTime() 985fd7d3a23316ec0d2320fece85201859b52c2aefMarco Nelissen // return false when called, to indicate that this vbri tag does not have the 995fd7d3a23316ec0d2320fece85201859b52c2aefMarco Nelissen // requested information 1005fd7d3a23316ec0d2320fece85201859b52c2aefMarco Nelissen if (durationUs) { 1015fd7d3a23316ec0d2320fece85201859b52c2aefMarco Nelissen seeker->mDurationUs = durationUs; 1025fd7d3a23316ec0d2320fece85201859b52c2aefMarco Nelissen } 1034456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 104c7fc37a3dab9bd1f96713649f351b5990e6316ffJames Dong off64_t offset = post_id3_pos; 1054456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber for (size_t i = 0; i < numEntries; ++i) { 1064456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint32_t numBytes; 1074456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber switch (entrySize) { 1084456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber case 1: numBytes = buffer[i]; break; 1094456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber case 2: numBytes = U16_AT(buffer + 2 * i); break; 1104456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber case 3: numBytes = U24_AT(buffer + 3 * i); break; 1114456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber default: 1124456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber { 1134456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber CHECK_EQ(entrySize, 4u); 1144456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber numBytes = U32_AT(buffer + 4 * i); break; 1154456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1164456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1174456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1184456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber numBytes *= scale; 1194456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1204456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber seeker->mSegments.push(numBytes); 1214456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1223856b090cd04ba5dd4a59a12430ed724d5995909Steve Block ALOGV("entry #%d: %d offset 0x%08lx", i, numBytes, offset); 1234456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber offset += numBytes; 1244456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1254456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1264456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber delete[] buffer; 1274456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber buffer = NULL; 1284456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 129df64d15042bbd5e0e4933ac49bf3c177dd94752cSteve Block ALOGI("Found VBRI header."); 1304456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1314456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return seeker; 1324456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 1334456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1344456da54bcd206ed1f518c69cc959ca65a179c83Andreas HuberVBRISeeker::VBRISeeker() 1354456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber : mDurationUs(-1) { 1364456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 1374456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1384456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huberbool VBRISeeker::getDuration(int64_t *durationUs) { 1394456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (mDurationUs < 0) { 1404456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return false; 1414456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1424456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1434456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber *durationUs = mDurationUs; 1444456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1454456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return true; 1464456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 1474456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 148c7fc37a3dab9bd1f96713649f351b5990e6316ffJames Dongbool VBRISeeker::getOffsetForTime(int64_t *timeUs, off64_t *pos) { 1494456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (mDurationUs < 0) { 1504456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return false; 1514456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1524456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1534456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber int64_t segmentDurationUs = mDurationUs / mSegments.size(); 1544456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1554456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber int64_t nowUs = 0; 1564456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber *pos = mBasePos; 1574456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t segmentIndex = 0; 1584456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber while (segmentIndex < mSegments.size() && nowUs < *timeUs) { 1594456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber nowUs += segmentDurationUs; 1604456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber *pos += mSegments.itemAt(segmentIndex++); 1614456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1624456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1633856b090cd04ba5dd4a59a12430ed724d5995909Steve Block ALOGV("getOffsetForTime %lld us => 0x%08lx", *timeUs, *pos); 1644456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1654456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber *timeUs = nowUs; 1664456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1674456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return true; 1684456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 1694456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1704456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} // namespace android 1714456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 172