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// Copyright (c) 2012 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/base/decoder_buffer.h"
#include "base/debug/alias.h"
namespace media {
// Allocates a block of memory which is padded for use with the SIMD
// optimizations used by FFmpeg.
static uint8_t* AllocateFFmpegSafeBlock(size_t size) {
uint8_t* const block = reinterpret_cast<uint8_t*>(base::AlignedAlloc(
size + DecoderBuffer::kPaddingSize, DecoderBuffer::kAlignmentSize));
memset(block + size, 0, DecoderBuffer::kPaddingSize);
return block;
}
DecoderBuffer::DecoderBuffer(size_t size)
: size_(size), side_data_size_(0), is_key_frame_(false) {
Initialize();
}
DecoderBuffer::DecoderBuffer(const uint8_t* data,
size_t size,
const uint8_t* side_data,
size_t side_data_size)
: size_(size), side_data_size_(side_data_size), is_key_frame_(false) {
if (!data) {
CHECK_EQ(size_, 0u);
CHECK(!side_data);
return;
}
Initialize();
memcpy(data_.get(), data, size_);
if (!side_data) {
CHECK_EQ(side_data_size, 0u);
return;
}
DCHECK_GT(side_data_size_, 0u);
memcpy(side_data_.get(), side_data, side_data_size_);
}
DecoderBuffer::DecoderBuffer(std::unique_ptr<UnalignedSharedMemory> shm,
size_t size)
: size_(size),
side_data_size_(0),
shm_(std::move(shm)),
is_key_frame_(false) {}
DecoderBuffer::DecoderBuffer(
std::unique_ptr<ReadOnlyUnalignedMapping> shared_mem_mapping,
size_t size)
: size_(size),
side_data_size_(0),
shared_mem_mapping_(std::move(shared_mem_mapping)),
is_key_frame_(false) {}
DecoderBuffer::~DecoderBuffer() {
data_.reset();
side_data_.reset();
}
void DecoderBuffer::Initialize() {
data_.reset(AllocateFFmpegSafeBlock(size_));
if (side_data_size_ > 0)
side_data_.reset(AllocateFFmpegSafeBlock(side_data_size_));
}
// static
scoped_refptr<DecoderBuffer> DecoderBuffer::CopyFrom(const uint8_t* data,
size_t data_size) {
// If you hit this CHECK you likely have a bug in a demuxer. Go fix it.
CHECK(data);
return base::WrapRefCounted(new DecoderBuffer(data, data_size, NULL, 0));
}
// static
scoped_refptr<DecoderBuffer> DecoderBuffer::CopyFrom(const uint8_t* data,
size_t data_size,
const uint8_t* side_data,
size_t side_data_size) {
// If you hit this CHECK you likely have a bug in a demuxer. Go fix it.
CHECK(data);
CHECK(side_data);
return base::WrapRefCounted(
new DecoderBuffer(data, data_size, side_data, side_data_size));
}
// static
scoped_refptr<DecoderBuffer> DecoderBuffer::FromSharedMemoryRegion(
base::subtle::PlatformSharedMemoryRegion region,
off_t offset,
size_t size) {
// TODO(crbug.com/795291): when clients have converted to using
// base::ReadOnlySharedMemoryRegion the ugly mode check below will no longer
// be necessary.
auto shm = std::make_unique<UnalignedSharedMemory>(
std::move(region), size,
region.GetMode() ==
base::subtle::PlatformSharedMemoryRegion::Mode::kReadOnly
? true
: false);
if (size == 0 || !shm->MapAt(offset, size))
return nullptr;
return base::WrapRefCounted(new DecoderBuffer(std::move(shm), size));
}
// static
scoped_refptr<DecoderBuffer> DecoderBuffer::FromSharedMemoryRegion(
base::ReadOnlySharedMemoryRegion region,
off_t offset,
size_t size) {
std::unique_ptr<ReadOnlyUnalignedMapping> unaligned_mapping =
std::make_unique<ReadOnlyUnalignedMapping>(region, size, offset);
if (!unaligned_mapping->IsValid())
return nullptr;
return base::WrapRefCounted(
new DecoderBuffer(std::move(unaligned_mapping), size));
}
// static
scoped_refptr<DecoderBuffer> DecoderBuffer::CreateEOSBuffer() {
return base::WrapRefCounted(new DecoderBuffer(NULL, 0, NULL, 0));
}
bool DecoderBuffer::MatchesForTesting(const DecoderBuffer& buffer) const {
if (end_of_stream() != buffer.end_of_stream())
return false;
// It is illegal to call any member function if eos is true.
if (end_of_stream())
return true;
if (timestamp() != buffer.timestamp() || duration() != buffer.duration() ||
is_key_frame() != buffer.is_key_frame() ||
discard_padding() != buffer.discard_padding() ||
data_size() != buffer.data_size() ||
side_data_size() != buffer.side_data_size()) {
return false;
}
if (memcmp(data(), buffer.data(), data_size()) != 0 ||
memcmp(side_data(), buffer.side_data(), side_data_size()) != 0) {
return false;
}
if ((decrypt_config() == nullptr) != (buffer.decrypt_config() == nullptr))
return false;
return decrypt_config() ? decrypt_config()->Matches(*buffer.decrypt_config())
: true;
}
std::string DecoderBuffer::AsHumanReadableString() const {
if (end_of_stream())
return "EOS";
std::ostringstream s;
s << "timestamp=" << timestamp_.InMicroseconds()
<< " duration=" << duration_.InMicroseconds() << " size=" << size_
<< " side_data_size=" << side_data_size_
<< " is_key_frame=" << is_key_frame_
<< " encrypted=" << (decrypt_config_ != NULL) << " discard_padding (us)=("
<< discard_padding_.first.InMicroseconds() << ", "
<< discard_padding_.second.InMicroseconds() << ")";
if (decrypt_config_)
s << " decrypt=" << (*decrypt_config_);
return s.str();
}
void DecoderBuffer::set_timestamp(base::TimeDelta timestamp) {
DCHECK(!end_of_stream());
timestamp_ = timestamp;
}
void DecoderBuffer::CopySideDataFrom(const uint8_t* side_data,
size_t side_data_size) {
if (side_data_size > 0) {
side_data_size_ = side_data_size;
side_data_.reset(AllocateFFmpegSafeBlock(side_data_size_));
memcpy(side_data_.get(), side_data, side_data_size_);
} else {
side_data_.reset();
side_data_size_ = 0;
}
}
} // namespace media
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