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Original commit message from CVS: * configure.ac: * gst/alpha/Makefile.am: * gst/alpha/gstalpha.c: (gst_alpha_method_get_type), (gst_alpha_get_type), (gst_alpha_base_init), (gst_alpha_class_init), (gst_alpha_init), (gst_alpha_set_property), (gst_alpha_get_property), (gst_alpha_sink_link), (gst_alpha_add), (gst_alpha_chroma_key), (gst_alpha_chain), (gst_alpha_change_state), (plugin_init): A plugin to add an alpha channel to I420 video. Can optionally do chroma keying. * gst/multipart/Makefile.am: * gst/multipart/multipart.c: (plugin_init): * gst/multipart/multipartdemux.c: (gst_multipart_demux_base_init), (gst_multipart_demux_class_init), (gst_multipart_demux_init), (gst_multipart_demux_finalize), (gst_multipart_demux_handle_event), (gst_multipart_find_pad_by_mime), (gst_multipart_demux_chain), (gst_multipart_demux_change_state), (gst_multipart_demux_plugin_init): * gst/multipart/multipartmux.c: (gst_multipart_mux_get_type), (gst_multipart_mux_base_init), (gst_multipart_mux_class_init), (gst_multipart_mux_get_sink_event_masks), (gst_multipart_mux_init), (gst_multipart_mux_sinkconnect), (gst_multipart_mux_pad_link), (gst_multipart_mux_pad_unlink), (gst_multipart_mux_request_new_pad), (gst_multipart_mux_handle_src_event), (gst_multipart_mux_next_buffer), (gst_multipart_mux_compare_pads), (gst_multipart_mux_queue_pads), (gst_multipart_mux_loop), (gst_multipart_mux_get_property), (gst_multipart_mux_set_property), (gst_multipart_mux_change_state), (gst_multipart_mux_plugin_init): A Multipart demuxer/muxer. Not sure if it violates specs. Used to send multipart jpeg images to a browser. * gst/videobox/Makefile.am: * gst/videobox/README: * gst/videobox/gstvideobox.c: (gst_video_box_fill_get_type), (gst_video_box_get_type), (gst_video_box_base_init), (gst_video_box_class_init), (gst_video_box_init), (gst_video_box_set_property), (gst_video_box_get_property), (gst_video_box_sink_link), (gst_video_box_i420), (gst_video_box_ayuv), (gst_video_box_chain), (gst_video_box_change_state), (plugin_init): Crops or adds borders around an image. can do alpha channel borders as well. * gst/videomixer/Makefile.am: * gst/videomixer/README: * gst/videomixer/videomixer.c: (gst_videomixer_pad_get_type), (gst_videomixer_pad_base_init), (gst_videomixer_pad_class_init), (gst_videomixer_pad_get_sink_event_masks), (gst_videomixer_pad_get_property), (gst_videomixer_pad_set_property), (gst_videomixer_pad_sinkconnect), (gst_videomixer_pad_link), (gst_videomixer_pad_unlink), (gst_videomixer_pad_init), (gst_video_mixer_background_get_type), (gst_videomixer_get_type), (gst_videomixer_base_init), (gst_videomixer_class_init), (gst_videomixer_init), (gst_videomixer_request_new_pad), (gst_videomixer_handle_src_event), (gst_videomixer_blend_ayuv_i420), (gst_videomixer_fill_checker), (gst_videomixer_fill_color), (gst_videomixer_fill_queues), (gst_videomixer_blend_buffers), (gst_videomixer_update_queues), (gst_videomixer_loop), (gst_videomixer_get_property), (gst_videomixer_set_property), (gst_videomixer_change_state), (plugin_init): Generic video mixer plugin, can handle multiple inputs all with different framerates and video sizes. Is fully alpha channel aware.
28 lines
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28 lines
1 KiB
Plaintext
Video Mixer
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-----------
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A generice video mixer, it blends the ayuv buffers from all pads onto
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a new buffer. The new buffer has by default a checkerboard pattern but
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its color can be changed with a property.
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The mixer can mix streams with different framerates and video sizes. It
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uses the duration value of the buffer to schedule the rendering of the
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buffers. For streams with a different resoltion than the final output
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resolution one can specify the position of the top left corner where this
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image should be placed with the pad properties xpos and ypos.
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The overall alpha value of a stream can also be specified with a pad
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property.
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By default, the streams are blended in the order that the pads were
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requested from the element. This can be overridden by changing the
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zorder pad property of the stream, a stream with lower zorder gets
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drawn first.
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TODO
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----
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- really implement zorder
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- take I420 yuv as well
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- output AYUV if possible.
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- implement different blend modes, some code is already done
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- use filter caps on srcpad to decide on the final output size
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