From eb67a45ca82bc01ac843c853fd3c17f2a90e0250 Mon Sep 17 00:00:00 2001
From: ameerj <aj662@drexel.edu>
Date: Mon, 26 Oct 2020 23:07:36 -0400
Subject: video_core: NVDEC Implementation

This commit aims to implement the NVDEC (Nvidia Decoder) functionality, with video frame decoding being handled by the FFmpeg library.

The process begins with Ioctl commands being sent to the NVDEC and VIC (Video Image Composer) emulated devices. These allocate the necessary GPU buffers for the frame data, along with providing information on the incoming video data. A Submit command then signals the GPU to process and decode the frame data.

To decode the frame, the respective codec's header must be manually composed from the information provided by NVDEC, then sent with the raw frame data to the ffmpeg library.

Currently, H264 and VP9 are supported, with VP9 having some minor artifacting issues related mainly to the reference frame composition in its uncompressed header.

Async GPU is not properly implemented at the moment.

Co-Authored-By: David <25727384+ogniK5377@users.noreply.github.com>
---
 src/common/stream.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 src/common/stream.h

(limited to 'src/common/stream.h')

diff --git a/src/common/stream.h b/src/common/stream.h
new file mode 100644
index 000000000..2585c16af
--- /dev/null
+++ b/src/common/stream.h
@@ -0,0 +1,50 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+#include "common/common_types.h"
+
+namespace Common {
+
+enum class SeekOrigin {
+    SetOrigin,
+    FromCurrentPos,
+    FromEnd,
+};
+
+class Stream {
+public:
+    /// Stream creates a bitstream and provides common functionality on the stream.
+    explicit Stream();
+    ~Stream();
+
+    /// Reposition bitstream "cursor" to the specified offset from origin
+    void Seek(s32 offset, SeekOrigin origin);
+
+    /// Reads next byte in the stream buffer and increments position
+    u8 ReadByte();
+
+    /// Writes byte at current position
+    void WriteByte(u8 byte);
+
+    std::size_t GetPosition() const {
+        return position;
+    }
+
+    std::vector<u8>& GetBuffer() {
+        return buffer;
+    }
+
+    const std::vector<u8>& GetBuffer() const {
+        return buffer;
+    }
+
+private:
+    std::vector<u8> buffer;
+    std::size_t position{0};
+};
+
+} // namespace Common
-- 
cgit v1.2.3


From 8049b8beb625686a4edd9fd1bdf133496e6f462c Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Thu, 29 Oct 2020 22:55:56 -0400
Subject: common/stream: Be explicit with copy and move operators

---
 src/common/stream.h | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

(limited to 'src/common/stream.h')

diff --git a/src/common/stream.h b/src/common/stream.h
index 2585c16af..0e40692de 100644
--- a/src/common/stream.h
+++ b/src/common/stream.h
@@ -21,6 +21,12 @@ public:
     explicit Stream();
     ~Stream();
 
+    Stream(const Stream&) = delete;
+    Stream& operator=(const Stream&) = delete;
+
+    Stream(Stream&&) = default;
+    Stream& operator=(Stream&&) = default;
+
     /// Reposition bitstream "cursor" to the specified offset from origin
     void Seek(s32 offset, SeekOrigin origin);
 
@@ -30,15 +36,15 @@ public:
     /// Writes byte at current position
     void WriteByte(u8 byte);
 
-    std::size_t GetPosition() const {
+    [[nodiscard]] std::size_t GetPosition() const {
         return position;
     }
 
-    std::vector<u8>& GetBuffer() {
+    [[nodiscard]] std::vector<u8>& GetBuffer() {
         return buffer;
     }
 
-    const std::vector<u8>& GetBuffer() const {
+    [[nodiscard]] const std::vector<u8>& GetBuffer() const {
         return buffer;
     }
 
-- 
cgit v1.2.3