Merge pull request #4867 from lioncash/vp9
VP9: Minor interface changes and safety improvements
This commit is contained in:
commit
131a75b65d
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@ -21,6 +21,12 @@ public:
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explicit Stream();
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~Stream();
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Stream(const Stream&) = delete;
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Stream& operator=(const Stream&) = delete;
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Stream(Stream&&) = default;
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Stream& operator=(Stream&&) = default;
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/// Reposition bitstream "cursor" to the specified offset from origin
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void Seek(s32 offset, SeekOrigin origin);
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@ -30,15 +36,15 @@ public:
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/// Writes byte at current position
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void WriteByte(u8 byte);
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std::size_t GetPosition() const {
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[[nodiscard]] std::size_t GetPosition() const {
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return position;
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}
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std::vector<u8>& GetBuffer() {
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[[nodiscard]] std::vector<u8>& GetBuffer() {
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return buffer;
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}
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const std::vector<u8>& GetBuffer() const {
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[[nodiscard]] const std::vector<u8>& GetBuffer() const {
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return buffer;
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}
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@ -197,6 +197,60 @@ constexpr std::array<s32, 254> map_lut{
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230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 18, 242, 243, 244, 245, 246, 247,
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248, 249, 250, 251, 252, 253, 19,
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};
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// 6.2.14 Tile size calculation
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[[nodiscard]] s32 CalcMinLog2TileCols(s32 frame_width) {
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const s32 sb64_cols = (frame_width + 63) / 64;
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s32 min_log2 = 0;
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while ((64 << min_log2) < sb64_cols) {
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min_log2++;
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}
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return min_log2;
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}
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[[nodiscard]] s32 CalcMaxLog2TileCols(s32 frame_width) {
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const s32 sb64_cols = (frame_width + 63) / 64;
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s32 max_log2 = 1;
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while ((sb64_cols >> max_log2) >= 4) {
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max_log2++;
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}
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return max_log2 - 1;
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}
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// Recenters probability. Based on section 6.3.6 of VP9 Specification
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[[nodiscard]] s32 RecenterNonNeg(s32 new_prob, s32 old_prob) {
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if (new_prob > old_prob * 2) {
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return new_prob;
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}
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if (new_prob >= old_prob) {
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return (new_prob - old_prob) * 2;
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}
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return (old_prob - new_prob) * 2 - 1;
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}
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// Adjusts old_prob depending on new_prob. Based on section 6.3.5 of VP9 Specification
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[[nodiscard]] s32 RemapProbability(s32 new_prob, s32 old_prob) {
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new_prob--;
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old_prob--;
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std::size_t index{};
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if (old_prob * 2 <= 0xff) {
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index = static_cast<std::size_t>(std::max(0, RecenterNonNeg(new_prob, old_prob) - 1));
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} else {
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index = static_cast<std::size_t>(
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std::max(0, RecenterNonNeg(0xff - 1 - new_prob, 0xff - 1 - old_prob) - 1));
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}
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return map_lut[index];
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}
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} // Anonymous namespace
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VP9::VP9(GPU& gpu) : gpu(gpu) {}
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@ -236,32 +290,6 @@ void VP9::WriteProbabilityDelta(VpxRangeEncoder& writer, u8 new_prob, u8 old_pro
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EncodeTermSubExp(writer, delta);
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}
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s32 VP9::RemapProbability(s32 new_prob, s32 old_prob) {
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new_prob--;
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old_prob--;
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std::size_t index{};
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if (old_prob * 2 <= 0xff) {
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index = static_cast<std::size_t>(std::max(0, RecenterNonNeg(new_prob, old_prob) - 1));
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} else {
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index = static_cast<std::size_t>(
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std::max(0, RecenterNonNeg(0xff - 1 - new_prob, 0xff - 1 - old_prob) - 1));
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}
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return map_lut[index];
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}
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s32 VP9::RecenterNonNeg(s32 new_prob, s32 old_prob) {
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if (new_prob > old_prob * 2) {
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return new_prob;
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} else if (new_prob >= old_prob) {
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return (new_prob - old_prob) * 2;
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} else {
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return (old_prob - new_prob) * 2 - 1;
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}
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}
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void VP9::EncodeTermSubExp(VpxRangeEncoder& writer, s32 value) {
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if (WriteLessThan(writer, value, 16)) {
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writer.Write(value, 4);
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@ -361,28 +389,6 @@ void VP9::WriteMvProbabilityUpdate(VpxRangeEncoder& writer, u8 new_prob, u8 old_
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}
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}
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s32 VP9::CalcMinLog2TileCols(s32 frame_width) {
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const s32 sb64_cols = (frame_width + 63) / 64;
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s32 min_log2 = 0;
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while ((64 << min_log2) < sb64_cols) {
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min_log2++;
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}
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return min_log2;
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}
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s32 VP9::CalcMaxLog2TileCols(s32 frameWidth) {
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const s32 sb64_cols = (frameWidth + 63) / 64;
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s32 max_log2 = 1;
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while ((sb64_cols >> max_log2) >= 4) {
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max_log2++;
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}
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return max_log2 - 1;
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}
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Vp9PictureInfo VP9::GetVp9PictureInfo(const NvdecCommon::NvdecRegisters& state) {
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PictureInfo picture_info{};
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gpu.MemoryManager().ReadBlock(state.picture_info_offset, &picture_info, sizeof(PictureInfo));
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@ -25,6 +25,12 @@ public:
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VpxRangeEncoder();
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~VpxRangeEncoder();
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VpxRangeEncoder(const VpxRangeEncoder&) = delete;
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VpxRangeEncoder& operator=(const VpxRangeEncoder&) = delete;
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VpxRangeEncoder(VpxRangeEncoder&&) = default;
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VpxRangeEncoder& operator=(VpxRangeEncoder&&) = default;
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/// Writes the rightmost value_size bits from value into the stream
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void Write(s32 value, s32 value_size);
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@ -37,11 +43,11 @@ public:
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/// Signal the end of the bitstream
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void End();
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std::vector<u8>& GetBuffer() {
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[[nodiscard]] std::vector<u8>& GetBuffer() {
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return base_stream.GetBuffer();
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}
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const std::vector<u8>& GetBuffer() const {
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[[nodiscard]] const std::vector<u8>& GetBuffer() const {
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return base_stream.GetBuffer();
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}
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@ -59,6 +65,12 @@ public:
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VpxBitStreamWriter();
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~VpxBitStreamWriter();
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VpxBitStreamWriter(const VpxBitStreamWriter&) = delete;
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VpxBitStreamWriter& operator=(const VpxBitStreamWriter&) = delete;
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VpxBitStreamWriter(VpxBitStreamWriter&&) = default;
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VpxBitStreamWriter& operator=(VpxBitStreamWriter&&) = default;
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/// Write an unsigned integer value
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void WriteU(u32 value, u32 value_size);
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@ -75,10 +87,10 @@ public:
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void Flush();
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/// Returns byte_array
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std::vector<u8>& GetByteArray();
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[[nodiscard]] std::vector<u8>& GetByteArray();
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/// Returns const byte_array
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const std::vector<u8>& GetByteArray() const;
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[[nodiscard]] const std::vector<u8>& GetByteArray() const;
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private:
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/// Write bit_count bits from value into buffer
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@ -99,12 +111,18 @@ public:
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explicit VP9(GPU& gpu);
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~VP9();
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VP9(const VP9&) = delete;
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VP9& operator=(const VP9&) = delete;
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VP9(VP9&&) = default;
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VP9& operator=(VP9&&) = delete;
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/// Composes the VP9 frame from the GPU state information. Based on the official VP9 spec
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/// documentation
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std::vector<u8>& ComposeFrameHeader(NvdecCommon::NvdecRegisters& state);
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/// Returns true if the most recent frame was a hidden frame.
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bool WasFrameHidden() const {
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[[nodiscard]] bool WasFrameHidden() const {
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return hidden;
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}
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@ -121,12 +139,6 @@ private:
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/// Generates compressed header probability deltas in the bitstream writer
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void WriteProbabilityDelta(VpxRangeEncoder& writer, u8 new_prob, u8 old_prob);
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/// Adjusts old_prob depending on new_prob. Based on section 6.3.5 of VP9 Specification
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s32 RemapProbability(s32 new_prob, s32 old_prob);
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/// Recenters probability. Based on section 6.3.6 of VP9 Specification
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s32 RecenterNonNeg(s32 new_prob, s32 old_prob);
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/// Inverse of 6.3.4 Decode term subexp
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void EncodeTermSubExp(VpxRangeEncoder& writer, s32 value);
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@ -146,22 +158,18 @@ private:
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/// Write motion vector probability updates. 6.3.17 in the spec
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void WriteMvProbabilityUpdate(VpxRangeEncoder& writer, u8 new_prob, u8 old_prob);
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/// 6.2.14 Tile size calculation
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s32 CalcMinLog2TileCols(s32 frame_width);
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s32 CalcMaxLog2TileCols(s32 frame_width);
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/// Returns VP9 information from NVDEC provided offset and size
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Vp9PictureInfo GetVp9PictureInfo(const NvdecCommon::NvdecRegisters& state);
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[[nodiscard]] Vp9PictureInfo GetVp9PictureInfo(const NvdecCommon::NvdecRegisters& state);
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/// Read and convert NVDEC provided entropy probs to Vp9EntropyProbs struct
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void InsertEntropy(u64 offset, Vp9EntropyProbs& dst);
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/// Returns frame to be decoded after buffering
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Vp9FrameContainer GetCurrentFrame(const NvdecCommon::NvdecRegisters& state);
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[[nodiscard]] Vp9FrameContainer GetCurrentFrame(const NvdecCommon::NvdecRegisters& state);
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/// Use NVDEC providied information to compose the headers for the current frame
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std::vector<u8> ComposeCompressedHeader();
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VpxBitStreamWriter ComposeUncompressedHeader();
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[[nodiscard]] std::vector<u8> ComposeCompressedHeader();
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[[nodiscard]] VpxBitStreamWriter ComposeUncompressedHeader();
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GPU& gpu;
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std::vector<u8> frame;
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@ -169,7 +177,7 @@ private:
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std::array<s8, 4> loop_filter_ref_deltas{};
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std::array<s8, 2> loop_filter_mode_deltas{};
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bool hidden;
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bool hidden = false;
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s64 current_frame_number = -2; // since we buffer 2 frames
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s32 grace_period = 6; // frame offsets need to stabilize
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std::array<FrameContexts, 4> frame_ctxs{};
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