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• avcodec : add avcodec_get_supported_config()

  3 avril 2024, par Niklas Haas

  avcodec : add avcodec_get_supported_config()
  This replaces the myriad of existing lists in AVCodec by a unified API
  
  call, allowing us to (ultimately) trim down the sizeof(AVCodec) quite
  
  substantially, while also making this more trivially extensible.
  In addition to the already covered lists, add two new entries for color
  
  space and color range, mirroring the newly added negotiable fields in
  
  libavfilter.
  Once the deprecation period passes for the existing public fields, the
  
  rough plan is to move the commonly used fields (such as
  
  pix_fmt/sample_fmt) into FFCodec, possibly as a union of audio and video
  
  configuration types, and then implement the rarely used fields with
  
  custom callbacks.
  

  • [DH] doc/APIchanges
  • [DH] libavcodec/avcodec.c
  • [DH] libavcodec/avcodec.h
  • [DH] libavcodec/codec.h
  • [DH] libavcodec/codec_internal.h
  • [DH] libavcodec/version.h

• Cannot display a decoded video frame on Raylib

  20 décembre 2024, par gabriel_tiso

  I'm trying to explore libav and raylib just to understand how audio and video work, and also to learn how to build nice interfaces using the raylib project. I've implemented a simple struct capable of decoding audio and video frames. When a video frame appears, I convert it to the RGBA format, which packs the values into 32bpp. This is the setup :

  


      if (av_image_alloc((uint8_t **)media->dst_frame->data,
                       media->dst_frame->linesize, media->ctxs[0]->width,
                       media->ctxs[0]->height, AV_PIX_FMT_RGBA, 1) < 0) {
        fprintf(stderr, "Failed to setup dest image\n");
        return -1;
    }

    media->sws_ctx = sws_getContext(
        media->ctxs[0]->width, media->ctxs[0]->height, media->ctxs[0]->pix_fmt,
        media->ctxs[0]->width, media->ctxs[0]->height, AV_PIX_FMT_RGBA,
        SWS_BILINEAR, NULL, NULL, 0);

    // Later on, in the decode function:
    int ret = sws_scale(media->sws_ctx, media->frame->data,
                            media->frame->linesize, 0, media->frame->height,
                            media->dst_frame->data, media->dst_frame->linesize);



  


  In the main file, I init raylib, and setup the necessary steps to load the texture (here I'm trying to fetch the first video frame in order to show the user a preview of the video, later on I plan to reset the stream to allow a correct playback routine). I think the format of the image is right.

  


      Image previewImage =
        GenImageColor(videoArea.width, videoArea.height, BLACK);
    // I assume this makes the formats compatible
    ImageFormat(&previewImage, PIXELFORMAT_UNCOMPRESSED_R8G8B8A8);

    Texture2D videoTexture = LoadTextureFromImage(previewImage);
    UnloadImage(previewImage);


  


  
        if (!state->has_media) {
            DrawText("Drop a video file here!", videoArea.x + 10,
                     videoArea.y + 10, 20, GRAY);
        } else {
            if (state->first_frame) {
                do {
                    decode_packet(state->media);
                } while (!is_frame_video(state->media));

                UpdateTexture(videoTexture, state->media->dst_frame->data[0]);

                state->first_frame = 0;
            }
        }

        DrawTexture(videoTexture, videoArea.x, videoArea.y, WHITE);


  


  Anyway, this is what I get when a mp4 file is dropped :


  


  It seems like an alignment issue maybe ? Can someone point me in the right direction in order to correctly solve this problem ?

  


• swscale/lut3d : add 3DLUT dispatch system

  29 novembre 2024, par Niklas Haas

  swscale/lut3d : add 3DLUT dispatch system
  This is a lightweight wrapper around the underlying color management system,
  
  whose job it is merely to manage the 3DLUT state and apply them to the frame
  
  data. This is where we might add platform-specific optimizations in the future.
  I also plan on adding support for more pixel formats in the future. In
  
  particular, we could support YUV or XYZ input formats directly using only
  
  negligible additional code in the 3DLUT setup functions. This would eliminate
  
  the major source of slowdown, which is currently the roundtrip to RGBA64.
  

  • [DH] libswscale/Makefile
  • [DH] libswscale/lut3d.c
  • [DH] libswscale/lut3d.h