15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef MEDIA_MP4_BOX_READER_H_ 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define MEDIA_MP4_BOX_READER_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <map> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <vector> 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/compiler_specific.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/media_export.h" 142a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "media/base/media_log.h" 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/mp4/fourccs.h" 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/mp4/rcheck.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace media { 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace mp4 { 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class BoxReader; 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct MEDIA_EXPORT Box { 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual ~Box(); 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual bool Parse(BoxReader* reader) = 0; 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual FourCC BoxType() const = 0; 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class MEDIA_EXPORT BufferReader { 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) BufferReader(const uint8* buf, const int size) 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : buf_(buf), size_(size), pos_(0) {} 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool HasBytes(int count) { return (pos() + count <= size()); } 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Read a value from the stream, perfoming endian correction, and advance the 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // stream pointer. 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool Read1(uint8* v) WARN_UNUSED_RESULT; 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool Read2(uint16* v) WARN_UNUSED_RESULT; 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool Read2s(int16* v) WARN_UNUSED_RESULT; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool Read4(uint32* v) WARN_UNUSED_RESULT; 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool Read4s(int32* v) WARN_UNUSED_RESULT; 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool Read8(uint64* v) WARN_UNUSED_RESULT; 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool Read8s(int64* v) WARN_UNUSED_RESULT; 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ReadFourCC(FourCC* v) WARN_UNUSED_RESULT; 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ReadVec(std::vector<uint8>* t, int count) WARN_UNUSED_RESULT; 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // These variants read a 4-byte integer of the corresponding signedness and 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // store it in the 8-byte return type. 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool Read4Into8(uint64* v) WARN_UNUSED_RESULT; 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool Read4sInto8s(int64* v) WARN_UNUSED_RESULT; 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Advance the stream by this many bytes. 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool SkipBytes(int nbytes) WARN_UNUSED_RESULT; 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* data() const { return buf_; } 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int size() const { return size_; } 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int pos() const { return pos_; } 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) protected: 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* buf_; 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int size_; 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int pos_; 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) template<typename T> bool Read(T* t) WARN_UNUSED_RESULT; 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class MEDIA_EXPORT BoxReader : public BufferReader { 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ~BoxReader(); 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Create a BoxReader from a buffer. Note that this function may return NULL 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // if an intact, complete box was not available in the buffer. If |*err| is 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // set, there was a stream-level error when creating the box; otherwise, NULL 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // values are only expected when insufficient data is available. 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |buf| is retained but not owned, and must outlive the BoxReader instance. 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static BoxReader* ReadTopLevelBox(const uint8* buf, 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int buf_size, 822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const LogCB& log_cb, 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool* err); 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Read the box header from the current buffer. This function returns true if 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // there is enough data to read the header and the header is sane; that is, it 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // does not check to ensure the entire box is in the buffer before returning 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // true. The semantics of |*err| are the same as above. 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |buf| is not retained. 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static bool StartTopLevelBox(const uint8* buf, 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int buf_size, 932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const LogCB& log_cb, 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FourCC* type, 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int* box_size, 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool* err) WARN_UNUSED_RESULT; 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns true if |type| is recognized to be a top-level box, false 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // otherwise. This returns true for some boxes which we do not parse. 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Helpful in debugging misaligned appends. 1012a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) static bool IsValidTopLevelBox(const FourCC& type, 1022a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const LogCB& log_cb); 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Scan through all boxes within the current box, starting at the current 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // buffer position. Must be called before any of the *Child functions work. 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ScanChildren() WARN_UNUSED_RESULT; 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Read exactly one child box from the set of children. The type of the child 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // will be determined by the BoxType() method of |child|. 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ReadChild(Box* child) WARN_UNUSED_RESULT; 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Read one child if available. Returns false on error, true on successful 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // read or on child absent. 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool MaybeReadChild(Box* child) WARN_UNUSED_RESULT; 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Read at least one child. False means error or no such child present. 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) template<typename T> bool ReadChildren( 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<T>* children) WARN_UNUSED_RESULT; 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Read any number of children. False means error. 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) template<typename T> bool MaybeReadChildren( 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<T>* children) WARN_UNUSED_RESULT; 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Read all children, regardless of FourCC. This is used from exactly one box, 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // corresponding to a rather significant inconsistency in the BMFF spec. 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Note that this method is mutually exclusive with ScanChildren(). 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) template<typename T> bool ReadAllChildren( 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<T>* children) WARN_UNUSED_RESULT; 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Populate the values of 'version()' and 'flags()' from a full box header. 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Many boxes, but not all, use these values. This call should happen after 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // the box has been initialized, and does not re-read the main box header. 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ReadFullBoxHeader() WARN_UNUSED_RESULT; 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FourCC type() const { return type_; } 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8 version() const { return version_; } 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32 flags() const { return flags_; } 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 1402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) BoxReader(const uint8* buf, const int size, const LogCB& log_cb); 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Must be called immediately after init. If the return is false, this 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // indicates that the box header and its contents were not available in the 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // stream or were nonsensical, and that the box must not be used further. In 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // this case, if |*err| is false, the problem was simply a lack of data, and 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // should only be an error condition if some higher-level component knows that 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // no more data is coming (i.e. EOS or end of containing box). If |*err| is 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // true, the error is unrecoverable and the stream should be aborted. 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ReadHeader(bool* err); 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1512a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) LogCB log_cb_; 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FourCC type_; 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8 version_; 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32 flags_; 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) typedef std::multimap<FourCC, BoxReader> ChildMap; 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The set of child box FourCCs and their corresponding buffer readers. Only 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // valid if scanned_ is true. 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ChildMap children_; 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool scanned_; 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Template definitions 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)template<typename T> bool BoxReader::ReadChildren(std::vector<T>* children) { 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(MaybeReadChildren(children) && !children->empty()); 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)template<typename T> 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool BoxReader::MaybeReadChildren(std::vector<T>* children) { 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(scanned_); 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(children->empty()); 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) children->resize(1); 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FourCC child_type = (*children)[0].BoxType(); 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ChildMap::iterator start_itr = children_.lower_bound(child_type); 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ChildMap::iterator end_itr = children_.upper_bound(child_type); 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) children->resize(std::distance(start_itr, end_itr)); 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) typename std::vector<T>::iterator child_itr = children->begin(); 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (ChildMap::iterator itr = start_itr; itr != end_itr; ++itr) { 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(child_itr->Parse(&itr->second)); 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ++child_itr; 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) children_.erase(start_itr, end_itr); 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(2) << "Found " << children->size() << " " 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) << FourCCToString(child_type) << " boxes."; 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)template<typename T> 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool BoxReader::ReadAllChildren(std::vector<T>* children) { 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!scanned_); 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scanned_ = true; 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool err = false; 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (pos() < size()) { 2002a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) BoxReader child_reader(&buf_[pos_], size_ - pos_, log_cb_); 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!child_reader.ReadHeader(&err)) break; 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) T child; 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(child.Parse(&child_reader)); 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) children->push_back(child); 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos_ += child_reader.size(); 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return !err; 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace mp4 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace media 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // MEDIA_MP4_BOX_READER_H_ 215