From 5aed8f928a100bc008851f0f6d97f8202b9ed8cb Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Fri, 10 Jan 2020 20:52:16 -0800
Subject: [PATCH] Add V4L2M2M support using SDL renderer

Note: This requires FFmpeg master to work, since it depends on:
https://github.com/FFmpeg/FFmpeg/commit/d61cf1b1ebc2477749d7d7825a072400ed24af9
---
 app/streaming/video/ffmpeg.cpp | 45 +++++++++++++++++++++++++---------
 1 file changed, 33 insertions(+), 12 deletions(-)

diff --git a/app/streaming/video/ffmpeg.cpp b/app/streaming/video/ffmpeg.cpp
index 53daac75..e64ba2be 100644
--- a/app/streaming/video/ffmpeg.cpp
+++ b/app/streaming/video/ffmpeg.cpp
@@ -543,20 +543,41 @@ bool FFmpegVideoDecoder::initialize(PDECODER_PARAMETERS params)
 #endif
 
 #ifdef HAVE_DRM
-        // RKMPP is a hardware accelerated decoder that outputs DRI PRIME buffers
-        AVCodec* rkmppDecoder;
+        {
+            // RKMPP is a hardware accelerated decoder that outputs DRI PRIME buffers
+            AVCodec* rkmppDecoder;
 
-        if (params->videoFormat & VIDEO_FORMAT_MASK_H264) {
-            rkmppDecoder = avcodec_find_decoder_by_name("h264_rkmpp");
-        }
-        else {
-            rkmppDecoder = avcodec_find_decoder_by_name("hevc_rkmpp");
-        }
+            if (params->videoFormat & VIDEO_FORMAT_MASK_H264) {
+                rkmppDecoder = avcodec_find_decoder_by_name("h264_rkmpp");
+            }
+            else {
+                rkmppDecoder = avcodec_find_decoder_by_name("hevc_rkmpp");
+            }
 
-        if (rkmppDecoder != nullptr &&
-                tryInitializeRenderer(rkmppDecoder, params, nullptr,
-                                      []() -> IFFmpegRenderer* { return new DrmRenderer(); })) {
-            return true;
+            if (rkmppDecoder != nullptr &&
+                    tryInitializeRenderer(rkmppDecoder, params, nullptr,
+                                          []() -> IFFmpegRenderer* { return new DrmRenderer(); })) {
+                return true;
+            }
+        }
+#endif
+
+#ifdef Q_OS_LINUX
+        {
+            AVCodec* v4l2Decoder;
+
+            if (params->videoFormat & VIDEO_FORMAT_MASK_H264) {
+                v4l2Decoder = avcodec_find_decoder_by_name("h264_v4l2m2m");
+            }
+            else {
+                v4l2Decoder = avcodec_find_decoder_by_name("hevc_v4l2m2m");
+            }
+
+            if (v4l2Decoder != nullptr &&
+                    tryInitializeRenderer(v4l2Decoder, params, nullptr,
+                                          []() -> IFFmpegRenderer* { return new SdlRenderer(); })) {
+                return true;
+            }
         }
 #endif