Screen displays upside down

[aminukano585]

Issue

My screen display upside down, I have tried changing device orientation, flipping it upside down and locking up the orientation but the problem persists.

Device Details

Device: TECNO-C7
Android Version: 6.0
HiOS Version: Camon 1.1.0

Screenshot

[rom1v]

What if you rotate to landscape? Is it upside down in landscape?

If you record using screenrecord, is the resulting file upside down:

adb shell screenrecord /sdcard/file.mp4
adb pull /sdcard/file.mp4

?

[aminukano585]

Hi, @rom1v the view remains upside down even when rotated to landscape. However, the recorded screen in file.mp4 shows corrected view.

[rom1v]

One possible cause could be that the frame are encoded with some rotation metadata (which would surprise me, since it's just raw H.264).

Could you apply this patch, recompile and retry, and tell me what it prints in the console, please?

diff --git a/app/src/decoder.c b/app/src/decoder.c
index cad1991..f718e55 100644
--- a/app/src/decoder.c
+++ b/app/src/decoder.c
@@ -1,6 +1,7 @@
 #include "decoder.h"
 
 #include <libavformat/avformat.h>
+#include <libavutil/display.h>
 #include <libavutil/time.h>
 #include <SDL2/SDL_assert.h>
 #include <SDL2/SDL_events.h>
@@ -75,6 +76,14 @@ decoder_push(struct decoder *decoder, const AVPacket *packet) {
                                 decoder->video_buffer->decoding_frame);
     if (!ret) {
         // a frame was received
+        AVFrame *frame = decoder->video_buffer->decoding_frame;
+        LOGI("new frame");
+        for (int i = 0; i < frame->nb_side_data; ++i) {
+            AVFrameSideData *sd = frame->side_data[i];
+            if (sd->type == AV_FRAME_DATA_DISPLAYMATRIX) {
+                LOGI("rotation: %.2f", av_display_rotation_get((int32_t *) sd->data));
+            }
+        }
         push_frame(decoder);
     } else if (ret != AVERROR(EAGAIN)) {
         LOGE("Could not receive video frame: %d", ret);

[aminukano585]

Hi @rom1v, I have applied the patch but the problem persists.

This is the console output:
⋮

INFO: Initial texture: 720x1280
INFO: new frame
INFO: new frame
INFO: new frame

⋮

[rom1v]

On dev branch, there are two new solutions:

• --lock-video-orientation 2 (rotate the video stream)
• --rotation 2 or Ctrl+←/Ctrl+→ (rotate the display)