chromium/media/formats/mp4/es_descriptor.cc

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "media/formats/mp4/es_descriptor.h"

#include <stddef.h>

#include "media/base/bit_reader.h"
#include "media/formats/mp4/rcheck.h"

// The elementary stream size is specific by up to 4 bytes.
// The MSB of a byte indicates if there are more bytes for the size.
static bool ReadESSize(media::BitReader* reader, uint32_t* size) { … }

namespace media {

namespace mp4 {

namespace {

// Descriptors use a variable length size entry. We've fixed the size to
// 4 bytes to make inline construction simple. The lowest 7 bits encode
// the actual value, an MSB==1 indicates there's another byte to decode,
// and an MSB==0 indicates there are no more bytes to decode.
void EncodeDescriptorSize(size_t size, uint8_t* output) { … }

}  // namespace

// static
bool ESDescriptor::IsAAC(uint8_t object_type) { … }

// static
std::vector<uint8_t> ESDescriptor::CreateEsds(
    const std::vector<uint8_t>& aac_extra_data) { … }

ESDescriptor::ESDescriptor()
    : … { … }

ESDescriptor::~ESDescriptor() = default;

bool ESDescriptor::Parse(const std::vector<uint8_t>& data) { … }

uint8_t ESDescriptor::object_type() const { … }

const std::vector<uint8_t>& ESDescriptor::decoder_specific_info() const { … }

bool ESDescriptor::ParseDecoderConfigDescriptor(BitReader* reader) { … }

bool ESDescriptor::ParseDecoderSpecificInfo(BitReader* reader) { … }

}  // namespace mp4

}  // namespace media