// 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.

#ifndef MEDIA_FORMATS_WEBM_WEBM_CRYPTO_HELPERS_H_
#define MEDIA_FORMATS_WEBM_WEBM_CRYPTO_HELPERS_H_

#include <stdint.h>

#include <memory>

#include "base/containers/span.h"
#include "media/base/decoder_buffer.h"
#include "media/base/media_export.h"

namespace media {

// Fills `decrypt_config`, which can be sent to the Decryptor if the stream
// has potentially encrypted frames. Also sets `data_offset` which indicates
// where the encrypted data starts. If the frame is unencrypted
// `*decrypt_config` will be null. Returns true if `data` is valid, false
// otherwise, in which case `decrypt_config` and `data_offset` will not be
// changed. Current encrypted WebM request for comments specification is here
// http://wiki.webmproject.org/encryption/webm-encryption-rfc
bool MEDIA_EXPORT
WebMCreateDecryptConfig(base::span<const uint8_t> data,
                        base::span<const uint8_t> key_id,
                        std::unique_ptr<DecryptConfig>* decrypt_config,
                        size_t* data_offset);

}  // namespace media

#endif  // MEDIA_FORMATS_WEBM_WEBM_CRYPTO_HELPERS_H_