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• Rendering Bitmap using ANativeWindow

  19 février 2016, par William Seemann

  I’m decoding a video frame and trying to render is using Android’s ANativeWindow API in conjunction with a SurfaceView. I know I’m decoding the frame successfully because my demo application returns the decoded (and re-encoded) frame as a bitmap and displays it in an ImageView (bottom image). However, when trying to draw the decoded frame to a SurfaceView I’m getting garbage output (top image). Can someone explain why ?

  const int TARGET_IMAGE_FORMAT = AV_PIX_FMT_RGBA;
  
  const int TARGET_IMAGE_CODEC = AV_CODEC_ID_PNG;
  
  
  
  void convert_image(State *state, AVCodecContext *pCodecCtx, AVFrame *pFrame, AVPacket *avpkt, int *got_packet_ptr, int width, int height) {
  
          AVCodecContext *codecCtx;
  
          AVCodec *codec;
  
          AVFrame *frame;
  
  
  
          *got_packet_ptr = 0;
  
  
  
          if (width == -1) {
  
              width = pCodecCtx->width;
  
          }
  
  
  
          if (height == -1) {
  
              height = pCodecCtx->height;
  
          }
  
  
  
          codec = avcodec_find_encoder(TARGET_IMAGE_CODEC);
  
          if (!codec) {
  
              printf("avcodec_find_decoder() failed to find decoder\n");
  
              goto fail;
  
          }
  
  
  
          codecCtx = avcodec_alloc_context3(codec);
  
          if (!codecCtx) {
  
              printf("avcodec_alloc_context3 failed\n");
  
              goto fail;
  
          }
  
  
  
          codecCtx->bit_rate = pCodecCtx->bit_rate;
  
          //codecCtx->width = pCodecCtx->width;
  
          //codecCtx->height = pCodecCtx->height;
  
          codecCtx->width = width;
  
          codecCtx->height = height;
  
          codecCtx->pix_fmt = TARGET_IMAGE_FORMAT;
  
          codecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
  
          codecCtx->time_base.num = pCodecCtx->time_base.num;
  
          codecCtx->time_base.den = pCodecCtx->time_base.den;
  
  
  
          if (!codec || avcodec_open2(codecCtx, codec, NULL) < 0) {
  
              printf("avcodec_open2() failed\n");
  
              goto fail;
  
          }
  
  
  
          frame = av_frame_alloc();
  
  
  
          if (!frame) {
  
              goto fail;
  
          }
  
  
  
          // Determine required buffer size and allocate buffer
  
          int numBytes = avpicture_get_size(TARGET_IMAGE_FORMAT, codecCtx->width, codecCtx->height);
  
          void * buffer = (uint8_t *) av_malloc(numBytes * sizeof(uint8_t));
  
  
  
          printf("wqwq %d\n", numBytes);
  
  
  
          avpicture_fill(((AVPicture *)frame),
  
                  buffer,
  
                  TARGET_IMAGE_FORMAT,
  
                  codecCtx->width,
  
                  codecCtx->height);
  
  
  
          avpicture_alloc(((AVPicture *)frame),
  
                  TARGET_IMAGE_FORMAT,
  
                  codecCtx->width,
  
                  codecCtx->height);
  
  
  
          struct SwsContext *scalerCtx = sws_getContext(pCodecCtx->width, 
  
                  pCodecCtx->height, 
  
                  pCodecCtx->pix_fmt,
  
                  //pCodecCtx->width,
  
                  //pCodecCtx->height,
  
                  width,
  
                  height,
  
                  TARGET_IMAGE_FORMAT, 
  
                  SWS_FAST_BILINEAR, 0, 0, 0);
  
  
  
          if (!scalerCtx) {
  
              printf("sws_getContext() failed\n");
  
              goto fail;
  
          }
  
  
  
          sws_scale(scalerCtx,
  
                  (const uint8_t * const *) pFrame->data,
  
                  pFrame->linesize,
  
                  0,
  
                  pFrame->height,
  
                  frame->data,
  
                  frame->linesize);
  
  
  
          int ret = avcodec_encode_video2(codecCtx, avpkt, frame, got_packet_ptr);
  
  
  
          // code to draw the re-encoded frame on the surface view
  
          if (state->native_window) {    
  
              ANativeWindow_Buffer windowBuffer;
  
  
  
              if (ANativeWindow_lock(state->native_window, &windowBuffer, NULL) == 0) {
  
                  memcpy(windowBuffer.bits, avpkt->data, windowBuffer.width * windowBuffer.height * 4);
  
                  ANativeWindow_unlockAndPost(state->native_window);
  
              }
  
          }
  
  
  
          if (ret < 0) {
  
              *got_packet_ptr = 0;
  
          }
  
  
  
          fail:
  
          av_free(frame);
  
  
  
          free(buffer);
  
  
  
          if (codecCtx) {
  
              avcodec_close(codecCtx);
  
              av_free(codecCtx);
  
          }
  
  
  
          if (scalerCtx) {
  
              sws_freeContext(scalerCtx);
  
          }
  
  
  
          if (ret < 0 || !*got_packet_ptr) {
  
              av_free_packet(avpkt);
  
          }
  
      }

  

• ffmpeg x11grab Fedora 22 cannot open display [on hold]

  4 août 2015, par voor

  Running a fairly recent version of Fedora 22 :

  Linux localhost 4.1.3-200.fc22.x86_64 #1 SMP Wed Jul 22 19:51:58 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  Dual screen Acer XB270HU and AOC 2369. Also uses NVIDIA Drivers :

  ➜  ~  rpm -qa | grep nvidia
  
  nvidia-driver-libs-352.30-1.fc22.x86_64
  
  nvidia-driver-352.30-1.fc22.x86_64
  
  nvidia-settings-352.30-1.fc22.x86_64
  
  nvidia-libXNVCtrl-352.30-1.fc22.x86_64
  
  dkms-nvidia-352.30-1.fc22.x86_64
  
  nvidia-driver-libs-352.30-1.fc22.i686

  Whenever I attempt to do a x11grab in ffmpeg I get an error :

  ➜  ~  ffmpeg -f x11grab -r 15 -s 1920x1080 -i :0 -vcodec h264 -crf 30 -y output.mp4
  
  ffmpeg version 2.6.3 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.1.1 (GCC) 20150422 (Red Hat 5.1.1-1)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Invalid MIT-MAGIC-COOKIE-1 key[x11grab @ 0x1fe1d40] Cannot open display :0, error 1.
  
  :0: Input/output error

  I’ve tried a few different commands basically copy/pasta from the web on how to do screengrabs. I don’t need audio, just video, and all of them result in the same error.

  I am able to do xwininfo without any problems :

  ➜  ~  xwininfo    
  
  
  
  xwininfo: Please select the window about which you
  
            would like information by clicking the
  
            mouse in that window.
  
  
  
  xwininfo: Window id: 0x1e0006c "linux - ffmpeg x11grab Fedora 22 cannot open display - Stack Overflow - Google Chrome"
  
  
  
    Absolute upper-left X:  0
  
    Absolute upper-left Y:  27
  
    Relative upper-left X:  0
  
    Relative upper-left Y:  27
  
    Width: 2560
  
    Height: 1413
  
    Depth: 24
  
    Visual: 0x21
  
    Visual Class: TrueColor
  
    Border width: 0
  
    Class: InputOutput
  
    Colormap: 0x20 (installed)
  
    Bit Gravity State: ForgetGravity
  
    Window Gravity State: NorthWestGravity
  
    Backing Store State: NotUseful
  
    Save Under State: no
  
    Map State: IsViewable
  
    Override Redirect State: no
  
    Corners:  +0+27  -1920+27  -1920-0  0
  
    -geometry 2560x14130

• hwcontext : Add frame context mapping for nontrivial contexts

  4 mars 2017, par Mark Thompson

  hwcontext : Add frame context mapping for nontrivial contexts
  Some frames contexts are not usable without additional format-specific
  
  state in hwctx.  This change adds new functions frames_derive_from and
  
  frames_derive_to to initialise this state appropriately when deriving
  
  a frames context which will require it to be set.
  (cherry picked from commit 27978155bc661eec9f22bcf82c9cfc099cff4365)
  

  • [DH] libavutil/hwcontext.c
  • [DH] libavutil/hwcontext_internal.h