[FFmpeg-devel] [PATCH v8 06/13] avfilter/overlay_graphicsubs: Add overlay_graphicsubs and graphicsub2video filters
Andreas Rheinhardt
andreas.rheinhardt at outlook.com
Wed Sep 22 07:24:04 EEST 2021
Soft Works:
> - overlay_graphicsubs (VS -> V)
> Overlay graphic subtitles onto a video stream
>
> - graphicsub2video {S -> V)
> Converts graphic subtitles to video frames (with alpha)
> Gets auto-inserted for retaining compatibility with
> sub2video command lines
>
> Signed-off-by: softworkz <softworkz at hotmail.com>
> ---
> doc/filters.texi | 104 ++++
> libavfilter/Makefile | 2 +
> libavfilter/allfilters.c | 2 +
> libavfilter/vf_overlay_graphicsubs.c | 730 +++++++++++++++++++++++++++
> 4 files changed, 838 insertions(+)
> create mode 100644 libavfilter/vf_overlay_graphicsubs.c
>
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 94161003c3..9ce956e507 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -25079,6 +25079,110 @@ tools.
>
> @c man end VIDEO SINKS
>
> + at chapter Subtitle Filters
> + at c man begin SUBTITLE FILTERS
> +
> +When you configure your FFmpeg build, you can disable any of the
> +existing filters using @code{--disable-filters}.
> +
> +Below is a description of the currently available subtitle filters.
> +
> + at section graphicsub2video
> +
> +Renders graphic subtitles as video frames.
> +
> +This filter replaces the previous "sub2video" hack which did the conversion implicitly and up-front as subtitle filtering wasn't possible at that time.
> +To retain compatibility with earlier sub2video command lines, this filter is being auto-inserted in those cases.
> +
> +For overlaying graphicsal subtitles it is recommended to use the 'overlay_graphicsubs' filter which is more efficient and takes less processing resources.
> +
> +This filter is still useful in cases where the overlay is done with hardware acceleration (e.g. overlay_qsv, overlay_vaapi, overlay_cuda) for preparing the overlay frames.
> +
> +It accepts the following parameters:
> +
> + at table @option
> + at item size, s
> +Set the size of the output video frame.
> +
> + at end table
> +
> + at subsection Examples
> +
> + at itemize
> + at item
> +Overlay PGS subtitles
> +(not recommended - better use overlay_graphicsubs)
> + at example
> +ffmpeg -i "https://streams.videolan.org/samples/sub/PGS/Girl_With_The_Dragon_Tattoo_2%3A23%3A56.mkv" -filter_complex "[0:1]graphicsub2video[subs];[0:0][subs]overlay" output.mp4
> + at end example
> +
> + at item
> +Overlay PGS subtitles implicitly
> +The graphicsub2video is inserted automatically for compatibility with legacy command lines.
> + at example
> +ffmpeg -i "https://streams.videolan.org/samples/sub/PGS/Girl_With_The_Dragon_Tattoo_2%3A23%3A56.mkv" -filter_complex "[0:0][0:1]overlay" output.mp4
> + at end example
> + at end itemize
> +
> + at section overlay_graphicsubs
> +
> +Overlay graphic subtitles onto a video stream.
> +
> +This filter can blend graphical subtitles on a video stream directly, i.e. without creating full-size alpha images first.
> +The blending operation is limited to the area of the subtitle rectangles, which also means that no processing is done at times where no subtitles are to be displayed.
> +
> +
> +It accepts the following parameters:
> +
> + at table @option
> + at item x
> + at item y
> +Set the expression for the x and y coordinates of the overlaid video
> +on the main video. Default value is "0" for both expressions. In case
> +the expression is invalid, it is set to a huge value (meaning that the
> +overlay will not be displayed within the output visible area).
> +
> + at item eof_action
> +See @ref{framesync}.
> +
> + at item eval
> +Set when the expressions for @option{x}, and @option{y} are evaluated.
> +
> +It accepts the following values:
> + at table @samp
> + at item init
> +only evaluate expressions once during the filter initialization or
> +when a command is processed
> +
> + at item frame
> +evaluate expressions for each incoming frame
> + at end table
> +
> +Default value is @samp{frame}.
> +
> + at item shortest
> +See @ref{framesync}.
> +
> + at end table
> +
> + at subsection Examples
> +
> + at itemize
> + at item
> +Overlay PGS subtitles
> + at example
> +ffmpeg -i "https://streams.videolan.org/samples/sub/PGS/Girl_With_The_Dragon_Tattoo_2%3A23%3A56.mkv" -filter_complex "[0:1]graphicsub2video[subs];[0:0][subs]overlay" output.mp4
> + at end example
> +
> + at item
> +Overlay PGS subtitles implicitly
> +The graphicsub2video is inserted automatically for compatibility with legacy command lines.
> + at example
> +ffmpeg -i "https://streams.videolan.org/samples/sub/PGS/Girl_With_The_Dragon_Tattoo_2%3A23%3A56.mkv" -filter_complex "[0:0][0:1]overlay" output.mp4
> + at end example
> + at end itemize
> + at c man end SUBTITLE FILTERS
> +
> @chapter Multimedia Filters
> @c man begin MULTIMEDIA FILTERS
>
> diff --git a/libavfilter/Makefile b/libavfilter/Makefile
> index 041d3c5382..8fcc25989e 100644
> --- a/libavfilter/Makefile
> +++ b/libavfilter/Makefile
> @@ -290,6 +290,7 @@ OBJS-$(CONFIG_FSPP_FILTER) += vf_fspp.o qp_table.o
> OBJS-$(CONFIG_GBLUR_FILTER) += vf_gblur.o
> OBJS-$(CONFIG_GEQ_FILTER) += vf_geq.o
> OBJS-$(CONFIG_GRADFUN_FILTER) += vf_gradfun.o
> +OBJS-$(CONFIG_GRAPHICSUB2VIDEO_FILTER) += vf_overlay_graphicsubs.o framesync.o
> OBJS-$(CONFIG_GRAPHMONITOR_FILTER) += f_graphmonitor.o
> OBJS-$(CONFIG_GRAYWORLD_FILTER) += vf_grayworld.o
> OBJS-$(CONFIG_GREYEDGE_FILTER) += vf_colorconstancy.o
> @@ -363,6 +364,7 @@ OBJS-$(CONFIG_OVERLAY_CUDA_FILTER) += vf_overlay_cuda.o framesync.o vf
> OBJS-$(CONFIG_OVERLAY_OPENCL_FILTER) += vf_overlay_opencl.o opencl.o \
> opencl/overlay.o framesync.o
> OBJS-$(CONFIG_OVERLAY_QSV_FILTER) += vf_overlay_qsv.o framesync.o
> +OBJS-$(CONFIG_OVERLAY_GRAPHICSUBS_FILTER) += vf_overlay_graphicsubs.o framesync.o
> OBJS-$(CONFIG_OVERLAY_VULKAN_FILTER) += vf_overlay_vulkan.o vulkan.o
> OBJS-$(CONFIG_OWDENOISE_FILTER) += vf_owdenoise.o
> OBJS-$(CONFIG_PAD_FILTER) += vf_pad.o
> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
> index 154eba5bb2..10a310d20d 100644
> --- a/libavfilter/allfilters.c
> +++ b/libavfilter/allfilters.c
> @@ -345,6 +345,7 @@ extern const AVFilter ff_vf_oscilloscope;
> extern const AVFilter ff_vf_overlay;
> extern const AVFilter ff_vf_overlay_opencl;
> extern const AVFilter ff_vf_overlay_qsv;
> +extern const AVFilter ff_vf_overlay_graphicsubs;
> extern const AVFilter ff_vf_overlay_vulkan;
> extern const AVFilter ff_vf_overlay_cuda;
> extern const AVFilter ff_vf_owdenoise;
> @@ -524,6 +525,7 @@ extern const AVFilter ff_avf_showvolume;
> extern const AVFilter ff_avf_showwaves;
> extern const AVFilter ff_avf_showwavespic;
> extern const AVFilter ff_vaf_spectrumsynth;
> +extern const AVFilter ff_svf_graphicsub2video;
>
> /* multimedia sources */
> extern const AVFilter ff_avsrc_amovie;
> diff --git a/libavfilter/vf_overlay_graphicsubs.c b/libavfilter/vf_overlay_graphicsubs.c
> new file mode 100644
> index 0000000000..b71b34abc4
> --- /dev/null
> +++ b/libavfilter/vf_overlay_graphicsubs.c
> @@ -0,0 +1,730 @@
> +/*
> + * Copyright (c) 2021 softworkz (derived from vf_overlay)
> + * Copyright (c) 2010 Stefano Sabatini
> + * Copyright (c) 2010 Baptiste Coudurier
> + * Copyright (c) 2007 Bobby Bingham
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +
> +/**
> + * @file
> + * overlay graphical subtitles on top of a video frame
> + */
> +
> +#include "avfilter.h"
> +#include "formats.h"
> +#include "libavutil/common.h"
> +#include "libavutil/eval.h"
> +#include "libavutil/avstring.h"
> +#include "libavutil/pixdesc.h"
> +#include "libavutil/imgutils.h"
> +#include "libavutil/opt.h"
> +#include "internal.h"
> +#include "drawutils.h"
> +#include "framesync.h"
> +
> +#include "libavcodec/avcodec.h"
What do you actually need all those avcodec.h inclusions for now that
you moved the AV_SUBTITLE_FMT_* enum values to libavutil? I guess it is
no longer necessary now, isn't it?
> +
> +enum var_name {
> + VAR_MAIN_W, VAR_MW,
> + VAR_MAIN_H, VAR_MH,
> + VAR_OVERLAY_W, VAR_OW,
> + VAR_OVERLAY_H, VAR_OH,
> + VAR_HSUB,
> + VAR_VSUB,
> + VAR_X,
> + VAR_Y,
> + VAR_N,
> + VAR_POS,
> + VAR_T,
> + VAR_VARS_NB
> +};
> +
> +typedef struct OverlaySubsContext {
> + const AVClass *class;
> + int x, y; ///< position of overlaid picture
> + int w, h;
> + AVFrame *outpicref;
> +
> + int main_is_packed_rgb;
> + uint8_t main_rgba_map[4];
> + int main_has_alpha;
> + uint8_t overlay_rgba_map[4];
> + int eval_mode; ///< EvalMode
> +
> + FFFrameSync fs;
> +
> + int main_pix_step[4]; ///< steps per pixel for each plane of the main output
> + int hsub, vsub; ///< chroma subsampling values
> + const AVPixFmtDescriptor *main_desc; ///< format descriptor for main input
> +
> + double var_values[VAR_VARS_NB];
> + char *x_expr, *y_expr;
> +
> + AVExpr *x_pexpr, *y_pexpr;
> +} OverlaySubsContext;
> +
> +static const char *const var_names[] = {
> + "main_w", "W", ///< width of the main video
> + "main_h", "H", ///< height of the main video
> + "overlay_w", "w", ///< width of the overlay video
> + "overlay_h", "h", ///< height of the overlay video
> + "hsub",
> + "vsub",
> + "x",
> + "y",
> + "n", ///< number of frame
> + "pos", ///< position in the file
> + "t", ///< timestamp expressed in seconds
> + NULL
> +};
> +
> +#define MAIN 0
> +#define OVERLAY 1
> +
> +#define R 0
> +#define G 1
> +#define B 2
> +#define A 3
> +
> +#define Y 0
> +#define U 1
> +#define V 2
> +
> +enum EvalMode {
> + EVAL_MODE_INIT,
> + EVAL_MODE_FRAME,
> + EVAL_MODE_NB
> +};
> +
> +static av_cold void overlay_graphicsubs_uninit(AVFilterContext *ctx)
> +{
> + OverlaySubsContext *s = ctx->priv;
> +
> + ff_framesync_uninit(&s->fs);
> + av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
> + av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
> +}
> +
> +static inline int normalize_xy(double d, int chroma_sub)
> +{
> + if (isnan(d))
> + return INT_MAX;
> + return (int)d & ~((1 << chroma_sub) - 1);
> +}
> +
> +static void eval_expr(AVFilterContext *ctx)
> +{
> + OverlaySubsContext *s = ctx->priv;
> +
> + s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
> + s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);
> + /* It is necessary if x is expressed from y */
> + s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
> + s->x = normalize_xy(s->var_values[VAR_X], s->hsub);
> + s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);
> +}
> +
> +static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
> +{
> + int ret;
> + AVExpr *old = NULL;
> +
> + if (*pexpr)
> + old = *pexpr;
> + ret = av_expr_parse(pexpr, expr, var_names,
> + NULL, NULL, NULL, NULL, 0, log_ctx);
> + if (ret < 0) {
> + av_log(log_ctx, AV_LOG_ERROR,
> + "Error when evaluating the expression '%s' for %s\n",
> + expr, option);
> + *pexpr = old;
> + return ret;
> + }
> +
> + av_expr_free(old);
> + return 0;
> +}
> +
> +static int overlay_graphicsubs_query_formats(AVFilterContext *ctx)
> +{
> + AVFilterFormats *formats;
> + AVFilterLink *inlink0 = ctx->inputs[0];
> + AVFilterLink *inlink1 = ctx->inputs[1];
> + AVFilterLink *outlink = ctx->outputs[0];
> + int ret;
> + static const enum AVSubtitleType subtitle_fmts[] = { AV_SUBTITLE_FMT_BITMAP, AV_SUBTITLE_FMT_NONE };
> + static const enum AVPixelFormat supported_pix_fmts[] = {
> + AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
> + AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
> + AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
> + AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
> + AV_PIX_FMT_NONE
> + };
> +
> + /* set input0 video formats */
> + formats = ff_make_format_list(supported_pix_fmts);
> + if ((ret = ff_formats_ref(formats, &inlink0->outcfg.formats)) < 0)
> + return ret;
> +
> + /* set input1 subtitle formats */
> + formats = ff_make_format_list(subtitle_fmts);
> + if ((ret = ff_formats_ref(formats, &inlink1->outcfg.formats)) < 0)
> + return ret;
> +
> + /* set output0 video formats */
> + formats = ff_make_format_list(supported_pix_fmts);
You are using different formats list for the video input and output.
This means that your filter advertises to be able to accept e.g.
AV_PIX_FMT_YUV420P and output AV_PIX_FMT_YUV444P (or even
AV_PIX_FMT_ARGB). I just don't see the code for that.
> + if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int config_output(AVFilterLink *outlink)
> +{
> + AVFilterContext *ctx = outlink->src;
> + OverlaySubsContext *s = ctx->priv;
> + int ret;
> +
> + if ((ret = ff_framesync_init_dualinput(&s->fs, ctx)) < 0)
> + return ret;
> +
> + outlink->w = ctx->inputs[MAIN]->w;
> + outlink->h = ctx->inputs[MAIN]->h;
> + outlink->time_base = ctx->inputs[MAIN]->time_base;
> +
> + return ff_framesync_configure(&s->fs);
> +}
> +
> +// divide by 255 and round to nearest
> +// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
> +#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
> +
> +// calculate the non-pre-multiplied alpha, applying the general equation:
> +// alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
> +// (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
> +// ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
> +#define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
> +
> +/**
> + * Blend image in src to destination buffer dst at position (x, y).
> + */
This whole code looks quite duplicated from the ordinary overlay.
> +static av_always_inline void blend_packed_rgb(const AVFilterContext *ctx,
> + const AVFrame *dst, const AVSubtitleArea *src,
> + int x, int y,
> + int is_straight)
> +{
> + OverlaySubsContext *s = ctx->priv;
> + int i, imax, j, jmax;
> + const int src_w = src->w;
> + const int src_h = src->h;
> + const int dst_w = dst->width;
> + const int dst_h = dst->height;
> + uint8_t alpha; ///< the amount of overlay to blend on to main
> + const int dr = s->main_rgba_map[R];
> + const int dg = s->main_rgba_map[G];
> + const int db = s->main_rgba_map[B];
> + const int da = s->main_rgba_map[A];
> + const int dstep = s->main_pix_step[0];
> + const int sr = s->overlay_rgba_map[R];
> + const int sg = s->overlay_rgba_map[G];
> + const int sb = s->overlay_rgba_map[B];
> + const int sa = s->overlay_rgba_map[A];
> + int slice_start, slice_end;
> + uint8_t *S, *sp, *d, *dp;
> +
> + i = FFMAX(-y, 0);
> + imax = FFMIN3(-y + dst_h, FFMIN(src_h, dst_h), y + src_h);
> +
> + slice_start = i;
> + slice_end = i + imax;
> +
> + sp = src->buf[0]->data + slice_start * src->linesize[0];
> + dp = dst->data[0] + (slice_start + y) * dst->linesize[0];
> +
> + for (i = slice_start; i < slice_end; i++) {
> + j = FFMAX(-x, 0);
> + S = sp + j;
> + d = dp + ((x + j) * dstep);
> +
> + for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
> + uint32_t val = src->pal[*S];
> + const uint8_t *sval = (uint8_t *)&val;
> + alpha = sval[sa];
> +
> + // if the main channel has an alpha channel, alpha has to be calculated
> + // to create an un-premultiplied (straight) alpha value
> + if (s->main_has_alpha && alpha != 0 && alpha != 255) {
> + const uint8_t alpha_d = d[da];
> + alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
> + }
> +
> + switch (alpha) {
> + case 0:
> + break;
> + case 255:
> + d[dr] = sval[sr];
> + d[dg] = sval[sg];
> + d[db] = sval[sb];
> + break;
> + default:
> + // main_value = main_value * (1 - alpha) + overlay_value * alpha
> + // since alpha is in the range 0-255, the result must divided by 255
> + d[dr] = is_straight ? FAST_DIV255(d[dr] * (255 - alpha) + sval[sr] * alpha) :
> + FFMIN(FAST_DIV255(d[dr] * (255 - alpha)) + sval[sr], 255);
> + d[dg] = is_straight ? FAST_DIV255(d[dg] * (255 - alpha) + sval[sg] * alpha) :
> + FFMIN(FAST_DIV255(d[dg] * (255 - alpha)) + sval[sg], 255);
> + d[db] = is_straight ? FAST_DIV255(d[db] * (255 - alpha) + sval[sb] * alpha) :
> + FFMIN(FAST_DIV255(d[db] * (255 - alpha)) + sval[sb], 255);
> + }
> +
> + if (s->main_has_alpha) {
> + switch (alpha) {
> + case 0:
> + break;
> + case 255:
> + d[da] = sval[sa];
> + break;
> + default:
> + // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
> + d[da] += FAST_DIV255((255 - d[da]) * S[sa]);
> + }
> + }
> + d += dstep;
> + S += 1;
> + }
> + dp += dst->linesize[0];
> + sp += src->linesize[0];
> + }
> +}
> +
> +static av_always_inline void blend_plane_8_8bits(const AVFilterContext *ctx, const AVFrame *dst, const AVSubtitleArea *area,
> + const uint32_t *yuv_pal, int src_w, int src_h, int dst_w, int dst_h, int plane, int hsub, int vsub,
> + int x, int y, int dst_plane, int dst_offset, int dst_step)
> +{
> + const int src_wp = AV_CEIL_RSHIFT(src_w, hsub);
> + const int src_hp = AV_CEIL_RSHIFT(src_h, vsub);
> + const int dst_wp = AV_CEIL_RSHIFT(dst_w, hsub);
> + const int dst_hp = AV_CEIL_RSHIFT(dst_h, vsub);
> + const int yp = y >> vsub;
> + const int xp = x >> hsub;
> + uint8_t *s, *sp, *d, *dp, *dap;
> + int imax, i, j, jmax;
> + int slice_start, slice_end;
> +
> + i = FFMAX(-yp, 0); \
> + imax = FFMIN3(-yp + dst_hp, FFMIN(src_hp, dst_hp), yp + src_hp); \
> +
> + slice_start = i;
> + slice_end = i + imax;
> +
> + sp = area->buf[0]->data + (slice_start << vsub) * area->linesize[0];
> + dp = dst->data[dst_plane] + (yp + slice_start) * dst->linesize[dst_plane] + dst_offset;
> +
> + dap = dst->data[3] + ((yp + slice_start) << vsub) * dst->linesize[3];
> +
> + for (i = slice_start; i < slice_end; i++) {
> + j = FFMAX(-xp, 0);
> + d = dp + (xp + j) * dst_step;
> + s = sp + (j << hsub);
> + jmax = FFMIN(-xp + dst_wp, src_wp);
> +
> + for (; j < jmax; j++) {
> + uint32_t val = yuv_pal[*s];
> + const uint8_t *sval = (uint8_t *)&val;
> + const int alpha = sval[3];
> + const int max = 255, mid = 128;
> + const int d_int = *d;
> + const int sval_int = sval[plane];
> +
> + switch (alpha) {
> + case 0:
> + break;
> + case 255:
> + *d = sval[plane];
> + break;
> + default:
> + if (plane > 0)
> + *d = av_clip(FAST_DIV255((d_int - mid) * (max - alpha) + (sval_int - mid) * alpha) , -mid, mid) + mid;
> + else
> + *d = FAST_DIV255(d_int * (max - alpha) + sval_int * alpha);
> + break;
> + }
> +
> + d += dst_step;
> + s += 1 << hsub;
> + }
> + dp += dst->linesize[dst_plane];
> + sp += (1 << vsub) * area->linesize[0];
> + dap += (1 << vsub) * dst->linesize[3];
> + }
> +}
> +
> +#define RGB2Y(r, g, b) (uint8_t)(((66 * (r) + 129 * (g) + 25 * (b) + 128) >> 8) + 16)
> +#define RGB2U(r, g, b) (uint8_t)(((-38 * (r) - 74 * (g) + 112 * (b) + 128) >> 8) + 128)
> +#define RGB2V(r, g, b) (uint8_t)(((112 * (r) - 94 * (g) - 18 * (b) + 128) >> 8) + 128)
> +/* Converts R8 G8 B8 color to YUV. */
> +static av_always_inline void rgb_2_yuv(uint8_t r, uint8_t g, uint8_t b, uint8_t* y, uint8_t* u, uint8_t* v)
> +{
> + *y = RGB2Y((int)r, (int)g, (int)b);
> + *u = RGB2U((int)r, (int)g, (int)b);
> + *v = RGB2V((int)r, (int)g, (int)b);
> +}
> +
> +
> +static av_always_inline void blend_yuv_8_8bits(AVFilterContext *ctx, AVFrame *dst, const AVSubtitleArea *area, int hsub, int vsub, int x, int y)
> +{
> + OverlaySubsContext *s = ctx->priv;
> + const int src_w = area->w;
> + const int src_h = area->h;
> + const int dst_w = dst->width;
> + const int dst_h = dst->height;
> + const int sr = s->overlay_rgba_map[R];
> + const int sg = s->overlay_rgba_map[G];
> + const int sb = s->overlay_rgba_map[B];
> + const int sa = s->overlay_rgba_map[A];
> + uint32_t yuvpal[256];
> +
> + for (int i = 0; i < 256; ++i) {
> + const uint8_t *rgba = (const uint8_t *)&area->pal[i];
> + uint8_t *yuva = (uint8_t *)&yuvpal[i];
> + rgb_2_yuv(rgba[sr], rgba[sg], rgba[sb], &yuva[Y], &yuva[U], &yuva[V]);
> + yuva[3] = rgba[sa];
> + }
> +
> + blend_plane_8_8bits(ctx, dst, area, yuvpal, src_w, src_h, dst_w, dst_h, Y, 0, 0, x, y, s->main_desc->comp[Y].plane, s->main_desc->comp[Y].offset, s->main_desc->comp[Y].step);
> + blend_plane_8_8bits(ctx, dst, area, yuvpal, src_w, src_h, dst_w, dst_h, U, hsub, vsub, x, y, s->main_desc->comp[U].plane, s->main_desc->comp[U].offset, s->main_desc->comp[U].step);
> + blend_plane_8_8bits(ctx, dst, area, yuvpal, src_w, src_h, dst_w, dst_h, V, hsub, vsub, x, y, s->main_desc->comp[V].plane, s->main_desc->comp[V].offset, s->main_desc->comp[V].step);
> +}
> +
> +static int config_input_main(AVFilterLink *inlink)
> +{
> + int ret;
> + AVFilterContext *ctx = inlink->dst;
> + OverlaySubsContext *s = inlink->dst->priv;
> + const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
> +
> + av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc);
> + ff_fill_rgba_map(s->overlay_rgba_map, AV_PIX_FMT_RGB32); // it's actually AV_PIX_FMT_PAL8);
> +
> + s->hsub = pix_desc->log2_chroma_w;
> + s->vsub = pix_desc->log2_chroma_h;
> +
> + s->main_desc = pix_desc;
> +
> + s->main_is_packed_rgb = ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;
> + s->main_has_alpha = !!(pix_desc->flags & AV_PIX_FMT_FLAG_ALPHA);
> +
> + /* Finish the configuration by evaluating the expressions
> + now when both inputs are configured. */
> + s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
> + s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
> + s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
> + s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
> + s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
> + s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
> + s->var_values[VAR_X] = NAN;
> + s->var_values[VAR_Y] = NAN;
> + s->var_values[VAR_N] = 0;
> + s->var_values[VAR_T] = NAN;
> + s->var_values[VAR_POS] = NAN;
> +
> + if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
> + (ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
> + return ret;
> +
> + if (s->eval_mode == EVAL_MODE_INIT) {
> + eval_expr(ctx);
> + av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
> + s->var_values[VAR_X], s->x,
> + s->var_values[VAR_Y], s->y);
> + }
> +
> + av_log(ctx, AV_LOG_VERBOSE,
> + "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s\n",
> + ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
> + av_get_pix_fmt_name(ctx->inputs[MAIN]->format),
> + ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
> + av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format));
> + return 0;
> +}
> +
> +static int do_blend(FFFrameSync *fs)
> +{
> + AVFilterContext *ctx = fs->parent;
> + AVFrame *mainpic, *second;
> + OverlaySubsContext *s = ctx->priv;
> + AVFilterLink *inlink = ctx->inputs[0];
> + unsigned i;
> + int ret;
> +
> + ret = ff_framesync_dualinput_get_writable(fs, &mainpic, &second);
> + if (ret < 0)
> + return ret;
> + if (!second)
> + return ff_filter_frame(ctx->outputs[0], mainpic);
> +
> + if (s->eval_mode == EVAL_MODE_FRAME) {
> + int64_t pos = mainpic->pkt_pos;
> +
> + s->var_values[VAR_N] = (double)inlink->frame_count_out;
> + s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
> + NAN :(double)mainpic->pts * av_q2d(inlink->time_base);
> + s->var_values[VAR_POS] = pos == -1 ? NAN : (double)pos;
> +
> + s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = second->width;
> + s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = second->height;
> + s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = mainpic->width;
> + s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = mainpic->height;
> +
> + eval_expr(ctx);
> + av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",
> + s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS],
> + s->var_values[VAR_X], s->x,
> + s->var_values[VAR_Y], s->y);
> + }
> +
> + for (i = 0; i < second->num_subtitle_areas; i++) {
> + const AVSubtitleArea *sub_area = second->subtitle_areas[i];
> +
> + if (sub_area->type != AV_SUBTITLE_FMT_BITMAP) {
> + av_log(NULL, AV_LOG_WARNING, "overlay_graphicsub: non-bitmap subtitle\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + switch (inlink->format) {
> + case AV_PIX_FMT_YUV420P:
> + blend_yuv_8_8bits(ctx, mainpic, sub_area, 1, 1, sub_area->x + s->x, sub_area->y + s->y);
> + break;
> + case AV_PIX_FMT_YUV422P:
> + blend_yuv_8_8bits(ctx, mainpic, sub_area, 1, 0, sub_area->x + s->x, sub_area->y + s->y);
> + break;
> + case AV_PIX_FMT_YUV444P:
> + blend_yuv_8_8bits(ctx, mainpic, sub_area, 0, 0, sub_area->x + s->x, sub_area->y + s->y);
> + break;
> + case AV_PIX_FMT_RGB24:
> + case AV_PIX_FMT_BGR24:
> + case AV_PIX_FMT_ARGB:
> + case AV_PIX_FMT_RGBA:
> + case AV_PIX_FMT_BGRA:
> + case AV_PIX_FMT_ABGR:
> + blend_packed_rgb(ctx, mainpic, sub_area, sub_area->x + s->x, sub_area->y + s->y, 1);
> + break;
> + default:
> + av_log(NULL, AV_LOG_ERROR, "Unsupported input pix fmt: %d\n", inlink->format);
> + return AVERROR(EINVAL);
> + }
> + }
> +
> + return ff_filter_frame(ctx->outputs[0], mainpic);
> +}
> +
> +static av_cold int overlay_graphicsubs_init(AVFilterContext *ctx)
> +{
> + OverlaySubsContext *s = ctx->priv;
> +
> + s->fs.on_event = do_blend;
> + return 0;
> +}
> +
> +static int overlay_graphicsubs_activate(AVFilterContext *ctx)
> +{
> + OverlaySubsContext *s = ctx->priv;
> + return ff_framesync_activate(&s->fs);
> +}
> +
> +static int graphicsub2video_query_formats(AVFilterContext *ctx)
> +{
> + AVFilterFormats *formats;
> + AVFilterLink *inlink = ctx->inputs[0];
> + AVFilterLink *outlink = ctx->outputs[0];
> + static const enum AVSubtitleType subtitle_fmts[] = { AV_SUBTITLE_FMT_BITMAP, AV_SUBTITLE_FMT_NONE };
> + static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE };
> + int ret;
> +
> + /* set input subtitle formats */
> + formats = ff_make_format_list(subtitle_fmts);
> + if ((ret = ff_formats_ref(formats, &inlink->outcfg.formats)) < 0)
> + return ret;
> +
> + /* set output video formats */
> + formats = ff_make_format_list(pix_fmts);
> + if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int graphicsub2video_config_input(AVFilterLink *inlink)
> +{
> + AVFilterContext *ctx = inlink->dst;
> + OverlaySubsContext *s = ctx->priv;
> +
> + if (s->w <= 0 || s->h <= 0) {
> + s->w = inlink->w;
> + s->h = inlink->h;
> + }
> + return 0;
> +}
> +
> +static int graphicsub2video_config_output(AVFilterLink *outlink)
> +{
> + const AVFilterContext *ctx = outlink->src;
> + OverlaySubsContext *s = ctx->priv;
> + const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(outlink->format);
> +
> + outlink->w = s->w;
> + outlink->h = s->h;
> + outlink->sample_aspect_ratio = (AVRational){1,1};
> +
> + av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc);
> + ff_fill_rgba_map(s->overlay_rgba_map, AV_PIX_FMT_RGB32);
> +
> + s->hsub = pix_desc->log2_chroma_w;
> + s->vsub = pix_desc->log2_chroma_h;
> +
> + s->main_desc = pix_desc;
> +
> + s->main_is_packed_rgb = ff_fill_rgba_map(s->main_rgba_map, outlink->format) >= 0;
> + s->main_has_alpha = !!(pix_desc->flags & AV_PIX_FMT_FLAG_ALPHA);
> +
> + return 0;
> +}
> +
> +static int graphicsub2video_filter_frame(AVFilterLink *inlink, AVFrame *src_frame)
> +{
> + AVFilterLink *outlink = inlink->dst->outputs[0];
> + AVFrame *out;
> + const unsigned num_rects = src_frame->num_subtitle_areas;
> + unsigned int i;
> +
> + out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
> + if (!out)
> + return AVERROR(ENOMEM);
Leak on error.
> +
> + memset(out->data[0], 0, out->linesize[0] * out->height);
> +
> + out->pts = src_frame->pts;
> +
> +
> + for (i = 0; i < num_rects; i++) {
> + const AVSubtitleArea *sub_rect = src_frame->subtitle_areas[i];
> +
> + if (sub_rect->type != AV_SUBTITLE_FMT_BITMAP) {
> + av_log(NULL, AV_LOG_WARNING, "sub2video: non-bitmap subtitle\n");
> + return AVERROR_INVALIDDATA;
Leak.
> + }
> +
> + blend_packed_rgb(inlink->dst, out, sub_rect, sub_rect->x, sub_rect->y, 1);
> + }
> +
> + av_frame_free(&src_frame);
> + return ff_filter_frame(outlink, out);
> +}
> +
> +#define OFFSET(x) offsetof(OverlaySubsContext, x)
> +#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM)
> +
> +static const AVOption overlay_graphicsubs_options[] = {
> + { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
> + { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
> + { "eof_action", "Action to take when encountering EOF from secondary input ",
> + OFFSET(fs.opt_eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
> + EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, "eof_action" },
> + { "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, "eof_action" },
> + { "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, "eof_action" },
> + { "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, "eof_action" },
> + { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
> + { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
> + { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
> + { "shortest", "force termination when the shortest input terminates", OFFSET(fs.opt_shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
> + { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(fs.opt_repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
> + { NULL }
> +};
> +
> +static const AVOption graphicsub2video_options[] = {
> + { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
> + { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
> + { NULL }
> +};
> +
> +FRAMESYNC_DEFINE_CLASS(overlay_graphicsubs, OverlaySubsContext, fs);
> +
> +static const AVFilterPad overlay_graphicsubs_inputs[] = {
> + {
> + .name = "main",
> + .type = AVMEDIA_TYPE_VIDEO,
> + .config_props = config_input_main,
> + .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
> + },
> + {
> + .name = "overlay",
> + .type = AVMEDIA_TYPE_SUBTITLE,
> + },
> +};
> +
> +static const AVFilterPad overlay_graphicsubs_outputs[] = {
> + {
> + .name = "default",
> + .type = AVMEDIA_TYPE_VIDEO,
> + .config_props = config_output,
> + },
> +};
> +
> +const AVFilter ff_vf_overlay_graphicsubs = {
> + .name = "overlay_graphicsubs",
> + .description = NULL_IF_CONFIG_SMALL("Overlay graphical subtitles on top of the input."),
> + .preinit = overlay_graphicsubs_framesync_preinit,
> + .init = overlay_graphicsubs_init,
> + .uninit = overlay_graphicsubs_uninit,
> + .priv_size = sizeof(OverlaySubsContext),
> + .priv_class = &overlay_graphicsubs_class,
> + .query_formats = overlay_graphicsubs_query_formats,
> + .activate = overlay_graphicsubs_activate,
> + FILTER_INPUTS(overlay_graphicsubs_inputs),
> + FILTER_OUTPUTS(overlay_graphicsubs_outputs),
> +};
> +
> +AVFILTER_DEFINE_CLASS(graphicsub2video);
> +
> +static const AVFilterPad graphicsub2video_inputs[] = {
> + {
> + .name = "default",
> + .type = AVMEDIA_TYPE_SUBTITLE,
> + .filter_frame = graphicsub2video_filter_frame,
> + .config_props = graphicsub2video_config_input,
> + },
> +};
> +
> +static const AVFilterPad graphicsub2video_outputs[] = {
> + {
> + .name = "default",
> + .type = AVMEDIA_TYPE_VIDEO,
> + .config_props = graphicsub2video_config_output,
> + },
> +};
> +
> +AVFilter ff_svf_graphicsub2video = {
Missing const.
> + .name = "graphicsub2video",
> + .description = NULL_IF_CONFIG_SMALL("Convert graphical subtitles to video"),
> + .query_formats = graphicsub2video_query_formats,
> + .priv_size = sizeof(OverlaySubsContext),
> + .priv_class = &graphicsub2video_class,
> + FILTER_INPUTS(graphicsub2video_inputs),
> + FILTER_OUTPUTS(graphicsub2video_outputs),
> +};
>
More information about the ffmpeg-devel
mailing list