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vp8: Implement header composition 

Enables frame decoding with FFmpeg
This commit is contained in:
ameerj 2021-11-12 17:14:02 -05:00
parent b39b33b1fe
commit d35391b9f4
4 changed files with 90 additions and 6 deletions
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2
src/video_core/command_classes/codecs/codec.cpp
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@ -185,7 +185,7 @@ void Codec::Decode() {
case Tegra::NvdecCommon::VideoCodec::H264:
return h264_decoder->ComposeFrameHeader(state, is_first_frame);
case Tegra::NvdecCommon::VideoCodec::VP8:
return vp8_decoder->ComposeFrameHeader(state, is_first_frame);
return vp8_decoder->ComposeFrameHeader(state);
case Tegra::NvdecCommon::VideoCodec::VP9:
vp9_decoder->ComposeFrameHeader(state);
vp9_hidden_frame = vp9_decoder->WasFrameHidden();

41
src/video_core/command_classes/codecs/vp8.cpp
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@ -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

46
src/video_core/command_classes/codecs/vp8.h
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@ -4,8 +4,10 @@
#pragma once
#include <array>
#include <vector>
#include "common/common_funcs.h"
#include "common/common_types.h"
#include "video_core/command_classes/nvdec_common.h"
@ -20,11 +22,53 @@ public:
/// Compose the VP8 header of the frame for FFmpeg decoding
[[nodiscard]] const std::vector<u8>& ComposeFrameHeader(
const NvdecCommon::NvdecRegisters& state, bool is_first_frame = false);
const NvdecCommon::NvdecRegisters& state);
private:
std::vector<u8> frame;
GPU& gpu;
struct VP8PictureInfo {
INSERT_PADDING_WORDS_NOINIT(14);
u16 frame_width; // actual frame width
u16 frame_height; // actual frame height
u8 key_frame;
u8 version;
union {
u8 raw;
BitField<0, 2, u8> tile_format;
BitField<2, 3, u8> gob_height;
BitField<5, 3, u8> reserverd_surface_format;
};
u8 error_conceal_on; // 1: error conceal on; 0: off
u32 first_part_size; // the size of first partition(frame header and mb header partition)
u32 hist_buffer_size; // in units of 256
u32 vld_buffer_size; // in units of 1
// Current frame buffers
std::array<u32, 2> frame_stride; // [y_c]
u32 luma_top_offset; // offset of luma top field in units of 256
u32 luma_bot_offset; // offset of luma bottom field in units of 256
u32 luma_frame_offset; // offset of luma frame in units of 256
u32 chroma_top_offset; // offset of chroma top field in units of 256
u32 chroma_bot_offset; // offset of chroma bottom field in units of 256
u32 chroma_frame_offset; // offset of chroma frame in units of 256
INSERT_PADDING_BYTES_NOINIT(0x1c); // NvdecDisplayParams
// Decode picture buffer related
s8 current_output_memory_layout;
// output NV12/NV24 setting. index 0: golden; 1: altref; 2: last
std::array<s8, 3> output_memory_layout;
u8 segmentation_feature_data_update;
INSERT_PADDING_BYTES_NOINIT(3);
// ucode return result
u32 result_value;
std::array<u32, 8> partition_offset;
INSERT_PADDING_WORDS_NOINIT(3);
};
static_assert(sizeof(VP8PictureInfo) == 0xc0, "PictureInfo is an invalid size");
};
} // namespace Decoder

7
src/video_core/command_classes/nvdec_common.h
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@ -50,7 +50,10 @@ struct NvdecRegisters {
u64 h264_last_surface_chroma_offset; ///< 0x0858
std::array<u64, 17> surface_luma_offset; ///< 0x0860
std::array<u64, 17> surface_chroma_offset; ///< 0x08E8
INSERT_PADDING_WORDS_NOINIT(132); ///< 0x0970
INSERT_PADDING_WORDS_NOINIT(68); ///< 0x0970
u64 vp8_prob_data_offset; ///< 0x0A80
u64 vp8_header_partition_buf_offset; ///< 0x0A88
INSERT_PADDING_WORDS_NOINIT(60); ///< 0x0A90
u64 vp9_entropy_probs_offset; ///< 0x0B80
u64 vp9_backward_updates_offset; ///< 0x0B88
u64 vp9_last_frame_segmap_offset; ///< 0x0B90
@ -81,6 +84,8 @@ ASSERT_REG_POSITION(h264_last_surface_luma_offset, 0x10A);
ASSERT_REG_POSITION(h264_last_surface_chroma_offset, 0x10B);
ASSERT_REG_POSITION(surface_luma_offset, 0x10C);
ASSERT_REG_POSITION(surface_chroma_offset, 0x11D);
ASSERT_REG_POSITION(vp8_prob_data_offset, 0x150);
ASSERT_REG_POSITION(vp8_header_partition_buf_offset, 0x151);
ASSERT_REG_POSITION(vp9_entropy_probs_offset, 0x170);
ASSERT_REG_POSITION(vp9_backward_updates_offset, 0x171);
ASSERT_REG_POSITION(vp9_last_frame_segmap_offset, 0x172);