mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-05-20 12:37:18 -04:00
54 lines
2.2 KiB
C++
Executable file
54 lines
2.2 KiB
C++
Executable file
// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
|
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
#include <vector>
|
|
|
|
#include "video_core/host1x/codecs/vp8.h"
|
|
#include "video_core/host1x/host1x.h"
|
|
#include "video_core/memory_manager.h"
|
|
|
|
namespace Tegra::Decoder {
|
|
VP8::VP8(Host1x::Host1x& host1x_) : host1x{host1x_} {}
|
|
|
|
VP8::~VP8() = default;
|
|
|
|
std::span<const u8> VP8::ComposeFrame(const Host1x::NvdecCommon::NvdecRegisters& state) {
|
|
VP8PictureInfo info;
|
|
host1x.GMMU().ReadBlock(state.picture_info_offset, &info, sizeof(VP8PictureInfo));
|
|
|
|
const bool is_key_frame = info.key_frame == 1u;
|
|
const auto bitstream_size = static_cast<size_t>(info.vld_buffer_size);
|
|
const size_t header_size = is_key_frame ? 10u : 3u;
|
|
frame.resize(header_size + bitstream_size);
|
|
|
|
// Based on page 30 of the VP8 specification.
|
|
// https://datatracker.ietf.org/doc/rfc6386/
|
|
frame[0] = is_key_frame ? 0u : 1u; // 1-bit frame type (0: keyframe, 1: interframes).
|
|
frame[0] |= static_cast<u8>((info.version & 7u) << 1u); // 3-bit version number
|
|
frame[0] |= static_cast<u8>(1u << 4u); // 1-bit show_frame flag
|
|
|
|
// The next 19-bits are the first partition size
|
|
frame[0] |= static_cast<u8>((info.first_part_size & 7u) << 5u);
|
|
frame[1] = static_cast<u8>((info.first_part_size & 0x7f8u) >> 3u);
|
|
frame[2] = static_cast<u8>((info.first_part_size & 0x7f800u) >> 11u);
|
|
|
|
if (is_key_frame) {
|
|
frame[3] = 0x9du;
|
|
frame[4] = 0x01u;
|
|
frame[5] = 0x2au;
|
|
// TODO(ameerj): Horizontal/Vertical Scale
|
|
// 16 bits: (2 bits Horizontal Scale << 14) | Width (14 bits)
|
|
frame[6] = static_cast<u8>(info.frame_width & 0xff);
|
|
frame[7] = static_cast<u8>(((info.frame_width >> 8) & 0x3f));
|
|
// 16 bits:(2 bits Vertical Scale << 14) | Height (14 bits)
|
|
frame[8] = static_cast<u8>(info.frame_height & 0xff);
|
|
frame[9] = static_cast<u8>(((info.frame_height >> 8) & 0x3f));
|
|
}
|
|
const u64 bitstream_offset = state.frame_bitstream_offset;
|
|
host1x.GMMU().ReadBlock(bitstream_offset, frame.data() + header_size, bitstream_size);
|
|
|
|
return frame;
|
|
}
|
|
|
|
} // namespace Tegra::Decoder
|