blob: 18a45a9e0084d0eb2f5f9e9f2ef948b928a922bc [file] [log] [blame]
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/formats/mp2t/ts_section_cets_pssh.h"
#include "base/logging.h"
#include "media/base/bit_reader.h"
#include "media/formats/mp2t/mp2t_common.h"
namespace media {
namespace mp2t {
const RegisterPsshBoxesCb& register_pssh_boxes_cb)
: register_pssh_boxes_cb_(register_pssh_boxes_cb) {}
TsSectionCetsPssh::~TsSectionCetsPssh() {}
bool TsSectionCetsPssh::Parse(bool payload_unit_start_indicator,
const uint8_t* buf,
int size) {
// Ignore if doesn't contain PUSI.
if (!payload_unit_start_indicator)
return false;
// TODO(dougsteed). This initial implementation requires the entire CETS-PSSH
// to fit in one TS packet, so we know that the box length will fit in one
// byte.
BitReader bit_reader(buf, size);
bool md5_flag;
RCHECK(bit_reader.ReadFlag(&md5_flag) && !md5_flag);
int box_length_bits = bit_reader.bits_available();
std::string pssh;
RCHECK(bit_reader.ReadString(box_length_bits, &pssh));
// Now check that the first 4 bytes are of the form {0x00, 0x00, 0x00, X},
// where X is the box length in bytes.
RCHECK(pssh[0] == 0x00 && pssh[1] == 0x00 && pssh[2] == 0x00);
uint8_t declared_box_bytes = static_cast<uint8_t>(pssh[3]);
RCHECK(declared_box_bytes <= box_length_bits * 8);
register_pssh_boxes_cb_.Run(std::vector<uint8_t>(pssh.begin(), pssh.end()));
return true;
void TsSectionCetsPssh::Flush() {
// No pending state.
void TsSectionCetsPssh::Reset() {
// No state to clean up.
} // namespace mp2t
} // namespace media