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27f8c9b27b
These fields are supposed to store information about the packet the frame was decoded from, specifically the byte offset it was stored at and its size. However, - the fields are highly ad-hoc - there is no strong reason why specifically those (and not any other) packet properties should have a dedicated field in AVFrame; unlike e.g. the timestamps, there is no fundamental link between coded packet offset/size and decoded frames - they only make sense for frames produced by decoding demuxed packets, and even then it is not always the case that the encoded data was stored in the file as a contiguous sequence of bytes (in order for pos to be well-defined) - pkt_pos was added without much explanation, apparently to allow passthrough of this information through lavfi in order to handle byte seeking in ffplay. That is now implemented using arbitrary user data passthrough in AVFrame.opaque_ref. - several filters use pkt_pos as a variable available to user-supplied expressions, but there seems to be no established motivation for using them. - pkt_size was added for use in ffprobe, but that too is now handled without using this field. Additonally, the values of this field produced by libavcodec are flawed, as described in the previous ffprobe conversion commit. In summary - these fields are ill-defined and insufficiently motivated, so deprecate them.
91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFILTER_OVERLAY_H
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#define AVFILTER_OVERLAY_H
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#include "libavutil/eval.h"
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#include "libavutil/pixdesc.h"
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#include "framesync.h"
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#include "avfilter.h"
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enum var_name {
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VAR_MAIN_W, VAR_MW,
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VAR_MAIN_H, VAR_MH,
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VAR_OVERLAY_W, VAR_OW,
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VAR_OVERLAY_H, VAR_OH,
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VAR_HSUB,
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VAR_VSUB,
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VAR_X,
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VAR_Y,
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VAR_N,
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#if FF_API_FRAME_PKT
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VAR_POS,
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#endif
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VAR_T,
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VAR_VARS_NB
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};
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enum OverlayFormat {
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OVERLAY_FORMAT_YUV420,
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OVERLAY_FORMAT_YUV420P10,
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OVERLAY_FORMAT_YUV422,
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OVERLAY_FORMAT_YUV422P10,
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OVERLAY_FORMAT_YUV444,
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OVERLAY_FORMAT_RGB,
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OVERLAY_FORMAT_GBRP,
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OVERLAY_FORMAT_AUTO,
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OVERLAY_FORMAT_NB
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};
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typedef struct OverlayContext {
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const AVClass *class;
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int x, y; ///< position of overlaid picture
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uint8_t main_is_packed_rgb;
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uint8_t main_rgba_map[4];
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uint8_t main_has_alpha;
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uint8_t overlay_is_packed_rgb;
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uint8_t overlay_rgba_map[4];
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uint8_t overlay_has_alpha;
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int format; ///< OverlayFormat
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int alpha_format;
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int eval_mode; ///< EvalMode
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FFFrameSync fs;
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int main_pix_step[4]; ///< steps per pixel for each plane of the main output
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int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay
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int hsub, vsub; ///< chroma subsampling values
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const AVPixFmtDescriptor *main_desc; ///< format descriptor for main input
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double var_values[VAR_VARS_NB];
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char *x_expr, *y_expr;
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AVExpr *x_pexpr, *y_pexpr;
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int (*blend_row[4])(uint8_t *d, uint8_t *da, uint8_t *s, uint8_t *a, int w,
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ptrdiff_t alinesize);
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int (*blend_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
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} OverlayContext;
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void ff_overlay_init_x86(OverlayContext *s, int format, int pix_format,
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int alpha_format, int main_has_alpha);
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#endif /* AVFILTER_OVERLAY_H */
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