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author | ameerj <52414509+ameerj@users.noreply.github.com> | 2021-11-12 23:14:02 +0100 |
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committer | ameerj <52414509+ameerj@users.noreply.github.com> | 2021-11-13 05:52:18 +0100 |
commit | d35391b9f43c5099b000940a83e795827cea35b8 (patch) | |
tree | 046b1ee7b8ea4b3f6b3e3d2194d9ea948bd835bd /src/video_core/command_classes/codecs/vp8.cpp | |
parent | codecs: Add VP8 codec class (diff) | |
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Diffstat (limited to 'src/video_core/command_classes/codecs/vp8.cpp')
-rw-r--r-- | src/video_core/command_classes/codecs/vp8.cpp | 41 |
1 files changed, 38 insertions, 3 deletions
diff --git a/src/video_core/command_classes/codecs/vp8.cpp b/src/video_core/command_classes/codecs/vp8.cpp index 976e9f9b7..3ee269948 100644 --- a/src/video_core/command_classes/codecs/vp8.cpp +++ b/src/video_core/command_classes/codecs/vp8.cpp @@ -6,15 +6,50 @@ #include <vector> #include "video_core/command_classes/codecs/vp8.h" +#include "video_core/gpu.h" +#include "video_core/memory_manager.h" namespace Tegra::Decoder { VP8::VP8(GPU& gpu_) : gpu(gpu_) {} VP8::~VP8() = default; -const std::vector<u8>& VP8::ComposeFrameHeader(const NvdecCommon::NvdecRegisters& state, - bool is_first_frame) { - return {}; +const std::vector<u8>& VP8::ComposeFrameHeader(const NvdecCommon::NvdecRegisters& state) { + VP8PictureInfo info; + gpu.MemoryManager().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; + gpu.MemoryManager().ReadBlock(bitstream_offset, frame.data() + header_size, bitstream_size); + + return frame; } } // namespace Tegra::Decoder |