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    • Clément Bœsch's avatar
      lavc: add lavfi metadata support. · 6fb2fd89
      Clément Bœsch authored
      This commit introduces a new AVPacket side data type:
      AV_PKT_DATA_STRINGS_METADATA. Its main goal is to provide a way to
      transmit the metadata from the AVFilterBufferRef up to the AVFrame. This
      is at the moment "only" useful for lavfi input from libavdevice:
      lavd/lavfi only outputs packets, and the metadata from the buffer ref
      kept in its context needs to be transmitted from the packet to the frame
      by the decoders. The buffer ref can be destroyed at any time (along with
      the metadata), and a duplication of the AVPacket needs to duplicate the
      metadata as well, so the choice of using the side data to store them was
      selected.
      
      Making sure lavd/lavfi raises the metadata is useful to allow tools like
      ffprobe to access the filters metadata (it is at the moment the only
      way); ffprobe will now automatically show the AVFrame metadata in any
      customizable output format for users. API users will also be able to
      access the AVFrame->metadata pointer the same way ffprobe does
      (av_frame_get_metadata).
      
      All the changes are done in this single commit to avoid some memory
      leaks: for instances, the changes in lavfi/avcodec.c are meant to
      duplicate the metadata from the buffer ref into the AVFrame. Unless we
      have an internal way of freeing the AVFrame->metadata automatically, it
      will leak in most of the user apps. To fix this problem, we introduce
      AVCodecContext->metadata and link avctx->metadata to the current
      frame->metadata and free it at each decode frame call (and in the codec
      closing callback for the last one). But doing this also means to update
      the way the tiff decoder already handles the AVFrame->metadata (it's the
      only one decoder with frame metadata at the moment), by making sure it
      is not trying to free a pointer already freed by the lavc internals.
      
      The lavfi/avcodec.c buffer ref code is based on an old Thomas Kühnel
      work, the rest of the code belongs to the commit author.
      Signed-off-by: 's avatarThomas Kühnel <kuehnelth@googlemail.com>
      Signed-off-by: 's avatarClément Bœsch <ubitux@gmail.com>
      6fb2fd89
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