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• Merge commit 'd7320ca3ed10f0d35b3740fa03341161e74275ea'

  31 octobre 2017, par James Almer

  Merge commit 'd7320ca3ed10f0d35b3740fa03341161e74275ea'
  * commit 'd7320ca3ed10f0d35b3740fa03341161e74275ea' :
  
    arm : Avoid using .dn register aliases
  Merged-by : James Almer <jamrial@gmail.com>
  

  • [DH] configure
  • [DH] libavcodec/arm/vc1dsp_init_neon.c
  • [DH] libavcodec/arm/vc1dsp_neon.S

• C++ ffmpeg sws_getCachedContext seg fault when reading opengl buffer

  3 juillet 2022, par user19068953

  I made a program that draws some stuff on opengl, then reads the frames on the screen as rgba and encodes it as a yuv420 video, but I get a segfault when I try to send the red opengl frame to sws_getCachedContext. I used the muxing.c as the encoder and my code is as follows (I used align 256 because i have another framebuffer that uses 128) :

  


      constexpr int ALIGNMENT = 256;
    if (posix_memalign((void**)&state.glBuffer, ALIGNMENT, gl_width * gl_height * 4) != 0) 
    {
        VI_ERROR("Couldn't allocate frame buffer ");
        return false;
    }
    REGISTER("done, returning");
    return true;


  


  Then i read the frame after drawing the stuff i want :

  


          glReadPixels(0, 0,
                 gl_width, gl_height, 
                 GL_RGBA, GL_UNSIGNED_BYTE, 
                 (GLvoid*) state.glBuffer);


  


  The window is the same size as the gl_buffer (I know the result will be flipped, thats ok)

  


  And finally i send it to the encoder(rgb_data is glBuffer) :

  


  void video_encoder::set_frame_yuv_from_rgb(AVFrame *frame, struct SwsContext *sws_context) {
    const int in_linesize[1] = { 4 * width };

width = gl_width;
height = gl_height;
sws_context = sws_getCachedContext(sws_context,
        width, height, AV_PIX_FMT_RGBA,
        width, height, AV_PIX_FMT_YUV420P,
        0, 0, 0, 0);
        
sws_scale(sws_context, (const uint8_t * const *)&rgb_data, in_linesize, 0,
        height, frame->data, frame->linesize);
}


  


  I get a seg fault on sws_getCachedContext any idea why this happens and how do i fix it ?

  


  Edit : width = 512, height = 256, valgrind says : Invalid read of size 16.

  


• lavf : Remove a now useless parameter to ffurl_register_protocol

  29 octobre 2013, par Martin Storsjö

  lavf : Remove a now useless parameter to ffurl_register_protocol
  This was added in 9b07a2dc02e9 as an ABI hack to allow older
  
  code built with lavf 52 to register protocols even if the size
  
  of the URLProtocol struct was increased. Later, registering
  
  protocols from outside of lavf was removed and this workaround
  
  isn’t needed any longer since lavf 53.
  This removes an unchecked malloc and a memory leak for the cases
  
  when this workaround actually was used - which it hasn’t since
  
  lavf 53.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/allformats.c
  • [DH] libavformat/avio.c
  • [DH] libavformat/url.h