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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/base/bitstream_buffer.h"
#include "base/numerics/checked_math.h"
#include "media/base/decrypt_config.h"
namespace media {
BitstreamBuffer::BitstreamBuffer()
: BitstreamBuffer(-1, base::UnsafeSharedMemoryRegion(), 0) {}
BitstreamBuffer::BitstreamBuffer(int32_t id,
base::UnsafeSharedMemoryRegion region,
size_t size,
uint64_t offset,
base::TimeDelta presentation_timestamp)
: id_(id),
region_(std::move(region)),
size_(size),
offset_(offset),
presentation_timestamp_(presentation_timestamp) {}
BitstreamBuffer::BitstreamBuffer(BitstreamBuffer&&) = default;
BitstreamBuffer& BitstreamBuffer::operator=(BitstreamBuffer&&) = default;
BitstreamBuffer::~BitstreamBuffer() = default;
scoped_refptr<DecoderBuffer> BitstreamBuffer::ToDecoderBuffer() {
return ToDecoderBuffer(0, size_);
}
scoped_refptr<DecoderBuffer> BitstreamBuffer::ToDecoderBuffer(off_t offset,
size_t size) {
// We do allow mapping beyond the bounds of the original specified size in
// order to deal with the OEMCrypto secure buffer format, but we do ensure
// it stays within the shared memory region.
base::CheckedNumeric<off_t> total_range(offset_);
total_range += offset;
if (!total_range.IsValid())
return nullptr;
const off_t final_offset = total_range.ValueOrDie();
total_range += base::checked_cast<off_t>(size);
if (!total_range.IsValid<size_t>())
return nullptr;
if (total_range.ValueOrDie<size_t>() > region_.GetSize())
return nullptr;
scoped_refptr<DecoderBuffer> buffer = DecoderBuffer::FromSharedMemoryRegion(
std::move(region_), final_offset, size);
if (!buffer)
return nullptr;
buffer->set_timestamp(presentation_timestamp_);
if (!key_id_.empty()) {
buffer->set_decrypt_config(
DecryptConfig::CreateCencConfig(key_id_, iv_, subsamples_));
}
return buffer;
}
void BitstreamBuffer::SetDecryptionSettings(
const std::string& key_id,
const std::string& iv,
const std::vector<SubsampleEntry>& subsamples) {
key_id_ = key_id;
iv_ = iv;
subsamples_ = subsamples;
}
} // namespace media
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