blob: b2ed2d9bf81042553d61fb4636a88d2539eac0c1 [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 "chromecast/media/cdm/chromecast_init_data.h"
#include "base/logging.h"
#include "media/base/bit_reader.h"
#include "media/cdm/cenc_utils.h"
namespace chromecast {
namespace media {
#define RCHECK(x) \
do { \
if (!(x)) \
return false; \
} while (0)
namespace {
const uint8_t kChromecastPlayreadyUuid[] = {
0x2b, 0xf8, 0x66, 0x80, 0xc6, 0xe5, 0x4e, 0x24,
0xbe, 0x23, 0x0f, 0x81, 0x5a, 0x60, 0x6e, 0xb2};
} // namespace
ChromecastInitData::ChromecastInitData() {
}
ChromecastInitData::~ChromecastInitData() {
}
bool FindChromecastInitData(const std::vector<uint8_t>& init_data,
InitDataMessageType type,
ChromecastInitData* chromecast_init_data_out) {
// Chromecast initData assumes a CENC data format and searches for PSSH boxes
// with SystemID |kChromecastPlayreadyUuid|. The PSSH box content is as
// follows:
// * |type| (2 bytes, InitDataMessageType)
// * |data| (all remaining bytes)
// Data may or may not be present and is specific to the given |type|.
std::vector<uint8_t> pssh_data;
if (!::media::GetPsshData(
init_data, std::vector<uint8_t>(kChromecastPlayreadyUuid,
kChromecastPlayreadyUuid +
sizeof(kChromecastPlayreadyUuid)),
&pssh_data)) {
return false;
}
::media::BitReader reader(pssh_data.data(), pssh_data.size());
uint16_t msg_type;
RCHECK(reader.ReadBits(2 * 8, &msg_type));
RCHECK(msg_type < static_cast<uint16_t>(InitDataMessageType::END));
RCHECK(msg_type == static_cast<uint16_t>(type));
chromecast_init_data_out->type = static_cast<InitDataMessageType>(msg_type);
chromecast_init_data_out->data.assign(
pssh_data.begin() + reader.bits_read() / 8, pssh_data.end());
return true;
}
} // namespace media
} // namespace chromecast