2013-09-24 01:35:40 +00:00
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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2014-10-01 22:10:21 +00:00
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#include "packager/media/formats/mp4/box_reader.h"
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2013-09-24 01:35:40 +00:00
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2014-06-20 21:45:09 +00:00
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#include <inttypes.h>
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2014-09-30 23:52:58 +00:00
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#include <limits>
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2014-10-01 22:10:21 +00:00
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#include "packager/base/logging.h"
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#include "packager/base/memory/scoped_ptr.h"
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#include "packager/base/strings/stringprintf.h"
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#include "packager/media/formats/mp4/box.h"
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2013-09-24 01:35:40 +00:00
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2016-05-20 21:19:33 +00:00
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namespace shaka {
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2013-09-24 01:35:40 +00:00
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namespace media {
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namespace mp4 {
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2014-09-30 21:52:21 +00:00
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BoxReader::BoxReader(const uint8_t* buf, size_t size)
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2013-11-22 21:24:25 +00:00
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: BufferReader(buf, size), type_(FOURCC_NULL), scanned_(false) {
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DCHECK(buf);
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2014-03-21 17:26:49 +00:00
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DCHECK_LT(0u, size);
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2013-09-24 01:35:40 +00:00
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}
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BoxReader::~BoxReader() {
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if (scanned_ && !children_.empty()) {
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2013-11-22 21:24:25 +00:00
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for (ChildMap::iterator itr = children_.begin(); itr != children_.end();
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++itr) {
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2013-09-24 01:35:40 +00:00
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DVLOG(1) << "Skipping unknown box: " << FourCCToString(itr->first);
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2013-11-22 21:24:25 +00:00
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delete itr->second;
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2013-09-24 01:35:40 +00:00
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}
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}
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}
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// static
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2014-09-30 21:52:21 +00:00
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BoxReader* BoxReader::ReadTopLevelBox(const uint8_t* buf,
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const size_t buf_size,
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bool* err) {
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2013-09-24 04:17:12 +00:00
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scoped_ptr<BoxReader> reader(new BoxReader(buf, buf_size));
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2013-09-24 01:35:40 +00:00
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if (!reader->ReadHeader(err))
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return NULL;
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2014-03-14 18:42:11 +00:00
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// We don't require the complete box to be available for MDAT box.
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2016-04-06 23:21:45 +00:00
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if (reader->type() == FOURCC_mdat)
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2014-03-14 18:42:11 +00:00
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return reader.release();
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2013-09-24 04:17:12 +00:00
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if (!IsValidTopLevelBox(reader->type())) {
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*err = true;
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return NULL;
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}
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if (reader->size() <= buf_size)
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return reader.release();
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return NULL;
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}
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// static
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bool BoxReader::StartTopLevelBox(const uint8_t* buf,
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const size_t buf_size,
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FourCC* type,
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uint64_t* box_size,
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bool* err) {
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BoxReader reader(buf, buf_size);
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2013-11-22 21:24:25 +00:00
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if (!reader.ReadHeader(err))
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return false;
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2013-09-24 04:17:12 +00:00
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if (!IsValidTopLevelBox(reader.type())) {
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*err = true;
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return false;
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}
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*type = reader.type();
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*box_size = reader.size();
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return true;
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}
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// static
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bool BoxReader::IsValidTopLevelBox(const FourCC& type) {
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switch (type) {
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case FOURCC_ftyp:
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case FOURCC_pdin:
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case FOURCC_bloc:
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case FOURCC_moov:
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case FOURCC_moof:
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case FOURCC_mfra:
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case FOURCC_mdat:
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case FOURCC_free:
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case FOURCC_skip:
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case FOURCC_meta:
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case FOURCC_meco:
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case FOURCC_styp:
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case FOURCC_sidx:
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case FOURCC_ssix:
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case FOURCC_prft:
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return true;
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default:
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// Hex is used to show nonprintable characters and aid in debugging
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LOG(ERROR) << "Unrecognized top-level box type 0x" << std::hex << type;
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2013-09-24 01:35:40 +00:00
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return false;
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}
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}
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bool BoxReader::ScanChildren() {
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DCHECK(!scanned_);
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scanned_ = true;
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while (pos() < size()) {
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2013-11-22 21:24:25 +00:00
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scoped_ptr<BoxReader> child(
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new BoxReader(&data()[pos()], size() - pos()));
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bool err;
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if (!child->ReadHeader(&err))
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return false;
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2013-09-24 01:35:40 +00:00
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FourCC box_type = child->type();
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size_t box_size = child->size();
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children_.insert(std::pair<FourCC, BoxReader*>(box_type, child.release()));
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RCHECK(SkipBytes(box_size));
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}
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return true;
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2013-09-24 01:35:40 +00:00
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}
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bool BoxReader::ReadChild(Box* child) {
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DCHECK(scanned_);
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FourCC child_type = child->BoxType();
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ChildMap::iterator itr = children_.find(child_type);
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RCHECK(itr != children_.end());
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DVLOG(2) << "Found a " << FourCCToString(child_type) << " box.";
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RCHECK(child->Parse(itr->second));
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delete itr->second;
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children_.erase(itr);
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return true;
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}
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2013-10-08 17:37:58 +00:00
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bool BoxReader::ChildExist(Box* child) {
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return children_.count(child->BoxType()) > 0;
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}
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2013-11-22 21:24:25 +00:00
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bool BoxReader::TryReadChild(Box* child) {
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if (!children_.count(child->BoxType()))
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return true;
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2013-09-24 01:35:40 +00:00
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return ReadChild(child);
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}
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bool BoxReader::ReadHeader(bool* err) {
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uint64_t size = 0;
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*err = false;
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2014-09-30 21:52:21 +00:00
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if (!ReadNBytesInto8(&size, sizeof(uint32_t)) || !ReadFourCC(&type_))
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return false;
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if (size == 0) {
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2014-05-05 21:49:45 +00:00
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// Boxes that run to EOS are not supported.
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NOTIMPLEMENTED() << base::StringPrintf("Box '%s' run to EOS.",
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FourCCToString(type_).c_str());
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*err = true;
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return false;
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} else if (size == 1) {
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2013-11-22 21:24:25 +00:00
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if (!Read8(&size))
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return false;
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2013-09-24 01:35:40 +00:00
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}
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2014-05-05 21:49:45 +00:00
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// The box should have at least the size of what have been parsed.
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if (size < pos()) {
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2014-06-20 21:45:09 +00:00
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LOG(ERROR) << base::StringPrintf("Box '%s' with size (%" PRIu64
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") is invalid.",
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2014-05-05 21:49:45 +00:00
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FourCCToString(type_).c_str(),
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size);
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*err = true;
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return false;
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}
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// 'mdat' box could have a 64-bit size; other boxes should be very small.
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2014-09-30 23:52:58 +00:00
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if (size > static_cast<uint64_t>(std::numeric_limits<int32_t>::max()) &&
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type_ != FOURCC_mdat) {
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2014-06-20 21:45:09 +00:00
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LOG(ERROR) << base::StringPrintf("Box '%s' size (%" PRIu64
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") is too large.",
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2014-05-05 21:49:45 +00:00
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FourCCToString(type_).c_str(),
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size);
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2013-09-24 01:35:40 +00:00
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*err = true;
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return false;
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}
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// Note that the pos_ head has advanced to the byte immediately after the
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// header, which is where we want it.
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2013-11-22 21:24:25 +00:00
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set_size(size);
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2013-09-24 01:35:40 +00:00
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return true;
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}
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} // namespace mp4
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} // namespace media
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2016-05-20 21:19:33 +00:00
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} // namespace shaka
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