Fix FFmpeg GPU decoding (#242)

This fixes the FFmpeg GPU decoding on some platforms.

Co-authored-by: MaranBr <maranbr@outlook.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/242

src/video_core/host1x/ffmpeg/ffmpeg.cpp

@@ -237,16 +237,22 @@ std::shared_ptr<Frame> DecoderContext::ReceiveFrame() {
     if (m_codec_context->hw_device_ctx) {
         // If we have a hardware context, make a separate frame here to receive the
         // hardware result before sending it to the output.
-        Frame intermediate_frame;
+        std::shared_ptr<Frame> intermediate_frame = std::make_shared<Frame>();
 
-        if (!receive(intermediate_frame.GetFrame())) {
+        if (!receive(intermediate_frame->GetFrame())) {
             return {};
 		}
 		
-		m_temp_frame->SetFormat(PreferredGpuFormat);
-        if (int ret = av_hwframe_transfer_data(m_temp_frame->GetFrame(), intermediate_frame.GetFrame(), 0); ret < 0) {
-            LOG_ERROR(HW_GPU, "av_hwframe_transfer_data error: {}", AVError(ret));
-            return {};
+        const auto fmt = intermediate_frame->GetPixelFormat();
+        const auto desc = av_pix_fmt_desc_get(fmt);
+        if (desc && (desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) {
+		    m_temp_frame->SetFormat(PreferredGpuFormat);
+            if (int ret = av_hwframe_transfer_data(m_temp_frame->GetFrame(), intermediate_frame->GetFrame(), 0); ret < 0) {
+                LOG_ERROR(HW_GPU, "av_hwframe_transfer_data error: {}", AVError(ret));
+                return {};
+            }
+        } else {
+            m_temp_frame = std::move(intermediate_frame);
         }
     } else {
         // Otherwise, decode the frame as normal.

src/video_core/host1x/ffmpeg/ffmpeg.h

@@ -21,6 +21,7 @@ extern "C" {
 
 #include <libavcodec/avcodec.h>
 #include <libavutil/opt.h>
+#include <libavutil/pixdesc.h>
 #include <libavcodec/codec_internal.h>
 
 #if defined(__GNUC__) || defined(__clang__)