VBRISeeker.cpp revision 4456da54bcd206ed1f518c69cc959ca65a179c83
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 234456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include "include/MP3Extractor.h" 244456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 254456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include <media/stagefright/foundation/ADebug.h> 264456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include <media/stagefright/DataSource.h> 274456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber#include <media/stagefright/Utils.h> 284456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 294456da54bcd206ed1f518c69cc959ca65a179c83Andreas Hubernamespace android { 304456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 314456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huberstatic uint32_t U24_AT(const uint8_t *ptr) { 324456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return ptr[0] << 16 | ptr[1] << 8 | ptr[2]; 334456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 344456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 354456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber// static 364456da54bcd206ed1f518c69cc959ca65a179c83Andreas Hubersp<VBRISeeker> VBRISeeker::CreateFromSource( 374456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber const sp<DataSource> &source, off_t post_id3_pos) { 384456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber off_t pos = post_id3_pos; 394456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 404456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint8_t header[4]; 414456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber ssize_t n = source->readAt(pos, header, sizeof(header)); 424456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (n < (ssize_t)sizeof(header)) { 434456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return NULL; 444456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 454456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 464456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint32_t tmp = U32_AT(&header[0]); 474456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t frameSize; 484456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber int sampleRate; 494456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (!MP3Extractor::get_mp3_frame_size(tmp, &frameSize, &sampleRate)) { 504456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return NULL; 514456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 524456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 534456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber // VBRI header follows 32 bytes after the header _ends_. 544456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber pos += sizeof(header) + 32; 554456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 564456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint8_t vbriHeader[26]; 574456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber n = source->readAt(pos, vbriHeader, sizeof(vbriHeader)); 584456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (n < (ssize_t)sizeof(vbriHeader)) { 594456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return NULL; 604456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 614456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 624456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (memcmp(vbriHeader, "VBRI", 4)) { 634456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return NULL; 644456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 654456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 664456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t numFrames = U32_AT(&vbriHeader[14]); 674456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 684456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber int64_t durationUs = 694456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber numFrames * 1000000ll * (sampleRate >= 32000 ? 1152 : 576) / sampleRate; 704456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 714456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber LOGV("duration = %.2f secs", durationUs / 1E6); 724456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 734456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t numEntries = U16_AT(&vbriHeader[18]); 744456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t entrySize = U16_AT(&vbriHeader[22]); 754456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t scale = U16_AT(&vbriHeader[20]); 764456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 774456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber LOGV("%d entries, scale=%d, size_per_entry=%d", 784456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber numEntries, 794456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber scale, 804456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber entrySize); 814456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 824456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t totalEntrySize = numEntries * entrySize; 834456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint8_t *buffer = new uint8_t[totalEntrySize]; 844456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 854456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber n = source->readAt(pos + sizeof(vbriHeader), buffer, totalEntrySize); 864456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (n < (ssize_t)totalEntrySize) { 874456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber delete[] buffer; 884456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber buffer = NULL; 894456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 904456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return NULL; 914456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 924456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 934456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber sp<VBRISeeker> seeker = new VBRISeeker; 944456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber seeker->mBasePos = post_id3_pos; 954456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber seeker->mDurationUs = durationUs; 964456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 974456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber off_t offset = post_id3_pos; 984456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber for (size_t i = 0; i < numEntries; ++i) { 994456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber uint32_t numBytes; 1004456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber switch (entrySize) { 1014456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber case 1: numBytes = buffer[i]; break; 1024456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber case 2: numBytes = U16_AT(buffer + 2 * i); break; 1034456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber case 3: numBytes = U24_AT(buffer + 3 * i); break; 1044456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber default: 1054456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber { 1064456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber CHECK_EQ(entrySize, 4u); 1074456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber numBytes = U32_AT(buffer + 4 * i); break; 1084456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1094456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1104456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1114456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber numBytes *= scale; 1124456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1134456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber seeker->mSegments.push(numBytes); 1144456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1154456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber LOGV("entry #%d: %d offset 0x%08lx", i, numBytes, offset); 1164456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber offset += numBytes; 1174456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1184456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1194456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber delete[] buffer; 1204456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber buffer = NULL; 1214456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1224456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber LOGI("Found VBRI header."); 1234456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1244456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return seeker; 1254456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 1264456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1274456da54bcd206ed1f518c69cc959ca65a179c83Andreas HuberVBRISeeker::VBRISeeker() 1284456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber : mDurationUs(-1) { 1294456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 1304456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1314456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huberbool VBRISeeker::getDuration(int64_t *durationUs) { 1324456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (mDurationUs < 0) { 1334456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return false; 1344456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1354456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1364456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber *durationUs = mDurationUs; 1374456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1384456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return true; 1394456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 1404456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1414456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huberbool VBRISeeker::getOffsetForTime(int64_t *timeUs, off_t *pos) { 1424456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber if (mDurationUs < 0) { 1434456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return false; 1444456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1454456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1464456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber int64_t segmentDurationUs = mDurationUs / mSegments.size(); 1474456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1484456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber int64_t nowUs = 0; 1494456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber *pos = mBasePos; 1504456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber size_t segmentIndex = 0; 1514456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber while (segmentIndex < mSegments.size() && nowUs < *timeUs) { 1524456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber nowUs += segmentDurationUs; 1534456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber *pos += mSegments.itemAt(segmentIndex++); 1544456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber } 1554456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1564456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber LOGV("getOffsetForTime %lld us => 0x%08lx", *timeUs, *pos); 1574456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1584456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber *timeUs = nowUs; 1594456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1604456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber return true; 1614456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} 1624456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 1634456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber} // namespace android 1644456da54bcd206ed1f518c69cc959ca65a179c83Andreas Huber 165