| /* |
| * 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 one video on top of another |
| */ |
| |
| #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/mathematics.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/timestamp.h" |
| #include "internal.h" |
| #include "drawutils.h" |
| #include "framesync.h" |
| #include "video.h" |
| |
| 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 |
| }; |
| |
| 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 |
| }; |
| |
| #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 |
| }; |
| |
| enum OverlayFormat { |
| OVERLAY_FORMAT_YUV420, |
| OVERLAY_FORMAT_YUV422, |
| OVERLAY_FORMAT_YUV444, |
| OVERLAY_FORMAT_RGB, |
| OVERLAY_FORMAT_GBRP, |
| OVERLAY_FORMAT_AUTO, |
| OVERLAY_FORMAT_NB |
| }; |
| |
| typedef struct OverlayContext { |
| const AVClass *class; |
| int x, y; ///< position of overlaid picture |
| |
| uint8_t main_is_packed_rgb; |
| uint8_t main_rgba_map[4]; |
| uint8_t main_has_alpha; |
| uint8_t overlay_is_packed_rgb; |
| uint8_t overlay_rgba_map[4]; |
| uint8_t overlay_has_alpha; |
| int format; ///< OverlayFormat |
| int eval_mode; ///< EvalMode |
| |
| FFFrameSync fs; |
| |
| int main_pix_step[4]; ///< steps per pixel for each plane of the main output |
| int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay |
| 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; |
| |
| void (*blend_image)(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y); |
| } OverlayContext; |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| OverlayContext *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) |
| { |
| OverlayContext *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); |
| 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 process_command(AVFilterContext *ctx, const char *cmd, const char *args, |
| char *res, int res_len, int flags) |
| { |
| OverlayContext *s = ctx->priv; |
| int ret; |
| |
| if (!strcmp(cmd, "x")) |
| ret = set_expr(&s->x_pexpr, args, cmd, ctx); |
| else if (!strcmp(cmd, "y")) |
| ret = set_expr(&s->y_pexpr, args, cmd, ctx); |
| else |
| ret = AVERROR(ENOSYS); |
| |
| if (ret < 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); |
| } |
| return ret; |
| } |
| |
| static const enum AVPixelFormat alpha_pix_fmts[] = { |
| AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P, |
| AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA, |
| AV_PIX_FMT_BGRA, AV_PIX_FMT_GBRAP, AV_PIX_FMT_NONE |
| }; |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| OverlayContext *s = ctx->priv; |
| |
| /* overlay formats contains alpha, for avoiding conversion with alpha information loss */ |
| static const enum AVPixelFormat main_pix_fmts_yuv420[] = { |
| AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVA420P, |
| AV_PIX_FMT_NV12, AV_PIX_FMT_NV21, |
| AV_PIX_FMT_NONE |
| }; |
| static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = { |
| AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE |
| }; |
| |
| static const enum AVPixelFormat main_pix_fmts_yuv422[] = { |
| AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE |
| }; |
| static const enum AVPixelFormat overlay_pix_fmts_yuv422[] = { |
| AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE |
| }; |
| |
| static const enum AVPixelFormat main_pix_fmts_yuv444[] = { |
| AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE |
| }; |
| static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = { |
| AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE |
| }; |
| |
| static const enum AVPixelFormat main_pix_fmts_gbrp[] = { |
| AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_NONE |
| }; |
| static const enum AVPixelFormat overlay_pix_fmts_gbrp[] = { |
| AV_PIX_FMT_GBRAP, AV_PIX_FMT_NONE |
| }; |
| |
| static const enum AVPixelFormat main_pix_fmts_rgb[] = { |
| 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 |
| }; |
| static const enum AVPixelFormat overlay_pix_fmts_rgb[] = { |
| AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA, |
| AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, |
| AV_PIX_FMT_NONE |
| }; |
| |
| AVFilterFormats *main_formats = NULL; |
| AVFilterFormats *overlay_formats = NULL; |
| int ret; |
| |
| switch (s->format) { |
| case OVERLAY_FORMAT_YUV420: |
| if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv420)) || |
| !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420))) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| break; |
| case OVERLAY_FORMAT_YUV422: |
| if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv422)) || |
| !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv422))) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| break; |
| case OVERLAY_FORMAT_YUV444: |
| if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv444)) || |
| !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444))) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| break; |
| case OVERLAY_FORMAT_RGB: |
| if (!(main_formats = ff_make_format_list(main_pix_fmts_rgb)) || |
| !(overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb))) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| break; |
| case OVERLAY_FORMAT_GBRP: |
| if (!(main_formats = ff_make_format_list(main_pix_fmts_gbrp)) || |
| !(overlay_formats = ff_make_format_list(overlay_pix_fmts_gbrp))) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| break; |
| case OVERLAY_FORMAT_AUTO: |
| if (!(main_formats = ff_make_format_list(alpha_pix_fmts))) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| break; |
| default: |
| av_assert0(0); |
| } |
| |
| if (s->format == OVERLAY_FORMAT_AUTO) { |
| ret = ff_set_common_formats(ctx, main_formats); |
| if (ret < 0) |
| goto fail; |
| } else { |
| if ((ret = ff_formats_ref(main_formats , &ctx->inputs[MAIN]->out_formats )) < 0 || |
| (ret = ff_formats_ref(overlay_formats, &ctx->inputs[OVERLAY]->out_formats)) < 0 || |
| (ret = ff_formats_ref(main_formats , &ctx->outputs[MAIN]->in_formats )) < 0) |
| goto fail; |
| } |
| |
| return 0; |
| fail: |
| if (main_formats) |
| av_freep(&main_formats->formats); |
| av_freep(&main_formats); |
| if (overlay_formats) |
| av_freep(&overlay_formats->formats); |
| av_freep(&overlay_formats); |
| return ret; |
| } |
| |
| static int config_input_overlay(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| OverlayContext *s = inlink->dst->priv; |
| int ret; |
| const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format); |
| |
| av_image_fill_max_pixsteps(s->overlay_pix_step, NULL, pix_desc); |
| |
| /* 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; |
| |
| s->overlay_is_packed_rgb = |
| ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0; |
| s->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts); |
| |
| 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 config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| OverlayContext *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 unpremultiplied 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). |
| */ |
| |
| static void blend_image_packed_rgb(AVFilterContext *ctx, |
| AVFrame *dst, const AVFrame *src, |
| int main_has_alpha, int x, int y) |
| { |
| OverlayContext *s = ctx->priv; |
| int i, imax, j, jmax; |
| const int src_w = src->width; |
| const int src_h = src->height; |
| 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]; |
| const int sstep = s->overlay_pix_step[0]; |
| uint8_t *S, *sp, *d, *dp; |
| |
| i = FFMAX(-y, 0); |
| sp = src->data[0] + i * src->linesize[0]; |
| dp = dst->data[0] + (y+i) * dst->linesize[0]; |
| |
| for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) { |
| j = FFMAX(-x, 0); |
| S = sp + j * sstep; |
| d = dp + (x+j) * dstep; |
| |
| for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) { |
| alpha = S[sa]; |
| |
| // if the main channel has an alpha channel, alpha has to be calculated |
| // to create an un-premultiplied (straight) alpha value |
| if (main_has_alpha && alpha != 0 && alpha != 255) { |
| uint8_t alpha_d = d[da]; |
| alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d); |
| } |
| |
| switch (alpha) { |
| case 0: |
| break; |
| case 255: |
| d[dr] = S[sr]; |
| d[dg] = S[sg]; |
| d[db] = S[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] = FAST_DIV255(d[dr] * (255 - alpha) + S[sr] * alpha); |
| d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + S[sg] * alpha); |
| d[db] = FAST_DIV255(d[db] * (255 - alpha) + S[sb] * alpha); |
| } |
| if (main_has_alpha) { |
| switch (alpha) { |
| case 0: |
| break; |
| case 255: |
| d[da] = S[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 += sstep; |
| } |
| dp += dst->linesize[0]; |
| sp += src->linesize[0]; |
| } |
| } |
| |
| static av_always_inline void blend_plane(AVFilterContext *ctx, |
| AVFrame *dst, const AVFrame *src, |
| int src_w, int src_h, |
| int dst_w, int dst_h, |
| int i, int hsub, int vsub, |
| int x, int y, |
| int main_has_alpha, |
| int dst_plane, |
| int dst_offset, |
| int dst_step) |
| { |
| int src_wp = AV_CEIL_RSHIFT(src_w, hsub); |
| int src_hp = AV_CEIL_RSHIFT(src_h, vsub); |
| int dst_wp = AV_CEIL_RSHIFT(dst_w, hsub); |
| int dst_hp = AV_CEIL_RSHIFT(dst_h, vsub); |
| int yp = y>>vsub; |
| int xp = x>>hsub; |
| uint8_t *s, *sp, *d, *dp, *dap, *a, *da, *ap; |
| int jmax, j, k, kmax; |
| |
| j = FFMAX(-yp, 0); |
| sp = src->data[i] + j * src->linesize[i]; |
| dp = dst->data[dst_plane] |
| + (yp+j) * dst->linesize[dst_plane] |
| + dst_offset; |
| ap = src->data[3] + (j<<vsub) * src->linesize[3]; |
| dap = dst->data[3] + ((yp+j) << vsub) * dst->linesize[3]; |
| |
| for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) { |
| k = FFMAX(-xp, 0); |
| d = dp + (xp+k) * dst_step; |
| s = sp + k; |
| a = ap + (k<<hsub); |
| da = dap + ((xp+k) << hsub); |
| |
| for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) { |
| int alpha_v, alpha_h, alpha; |
| |
| // average alpha for color components, improve quality |
| if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) { |
| alpha = (a[0] + a[src->linesize[3]] + |
| a[1] + a[src->linesize[3]+1]) >> 2; |
| } else if (hsub || vsub) { |
| alpha_h = hsub && k+1 < src_wp ? |
| (a[0] + a[1]) >> 1 : a[0]; |
| alpha_v = vsub && j+1 < src_hp ? |
| (a[0] + a[src->linesize[3]]) >> 1 : a[0]; |
| alpha = (alpha_v + alpha_h) >> 1; |
| } else |
| alpha = a[0]; |
| // if the main channel has an alpha channel, alpha has to be calculated |
| // to create an un-premultiplied (straight) alpha value |
| if (main_has_alpha && alpha != 0 && alpha != 255) { |
| // average alpha for color components, improve quality |
| uint8_t alpha_d; |
| if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) { |
| alpha_d = (da[0] + da[dst->linesize[3]] + |
| da[1] + da[dst->linesize[3]+1]) >> 2; |
| } else if (hsub || vsub) { |
| alpha_h = hsub && k+1 < src_wp ? |
| (da[0] + da[1]) >> 1 : da[0]; |
| alpha_v = vsub && j+1 < src_hp ? |
| (da[0] + da[dst->linesize[3]]) >> 1 : da[0]; |
| alpha_d = (alpha_v + alpha_h) >> 1; |
| } else |
| alpha_d = da[0]; |
| alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d); |
| } |
| *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha); |
| s++; |
| d += dst_step; |
| da += 1 << hsub; |
| a += 1 << hsub; |
| } |
| dp += dst->linesize[dst_plane]; |
| sp += src->linesize[i]; |
| ap += (1 << vsub) * src->linesize[3]; |
| dap += (1 << vsub) * dst->linesize[3]; |
| } |
| } |
| |
| static inline void alpha_composite(const AVFrame *src, const AVFrame *dst, |
| int src_w, int src_h, |
| int dst_w, int dst_h, |
| int x, int y) |
| { |
| uint8_t alpha; ///< the amount of overlay to blend on to main |
| uint8_t *s, *sa, *d, *da; |
| int i, imax, j, jmax; |
| |
| i = FFMAX(-y, 0); |
| sa = src->data[3] + i * src->linesize[3]; |
| da = dst->data[3] + (y+i) * dst->linesize[3]; |
| |
| for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) { |
| j = FFMAX(-x, 0); |
| s = sa + j; |
| d = da + x+j; |
| |
| for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) { |
| alpha = *s; |
| if (alpha != 0 && alpha != 255) { |
| uint8_t alpha_d = *d; |
| alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d); |
| } |
| switch (alpha) { |
| case 0: |
| break; |
| case 255: |
| *d = *s; |
| break; |
| default: |
| // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha |
| *d += FAST_DIV255((255 - *d) * *s); |
| } |
| d += 1; |
| s += 1; |
| } |
| da += dst->linesize[3]; |
| sa += src->linesize[3]; |
| } |
| } |
| |
| static av_always_inline void blend_image_yuv(AVFilterContext *ctx, |
| AVFrame *dst, const AVFrame *src, |
| int hsub, int vsub, |
| int main_has_alpha, |
| int x, int y) |
| { |
| OverlayContext *s = ctx->priv; |
| const int src_w = src->width; |
| const int src_h = src->height; |
| const int dst_w = dst->width; |
| const int dst_h = dst->height; |
| |
| blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 0, 0, 0, x, y, main_has_alpha, |
| s->main_desc->comp[0].plane, s->main_desc->comp[0].offset, s->main_desc->comp[0].step); |
| blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 1, hsub, vsub, x, y, main_has_alpha, |
| s->main_desc->comp[1].plane, s->main_desc->comp[1].offset, s->main_desc->comp[1].step); |
| blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 2, hsub, vsub, x, y, main_has_alpha, |
| s->main_desc->comp[2].plane, s->main_desc->comp[2].offset, s->main_desc->comp[2].step); |
| |
| if (main_has_alpha) |
| alpha_composite(src, dst, src_w, src_h, dst_w, dst_h, x, y); |
| } |
| |
| static av_always_inline void blend_image_planar_rgb(AVFilterContext *ctx, |
| AVFrame *dst, const AVFrame *src, |
| int hsub, int vsub, |
| int main_has_alpha, |
| int x, int y) |
| { |
| OverlayContext *s = ctx->priv; |
| const int src_w = src->width; |
| const int src_h = src->height; |
| const int dst_w = dst->width; |
| const int dst_h = dst->height; |
| |
| blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 0, 0, 0, x, y, main_has_alpha, |
| s->main_desc->comp[1].plane, s->main_desc->comp[1].offset, s->main_desc->comp[1].step); |
| blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 1, hsub, vsub, x, y, main_has_alpha, |
| s->main_desc->comp[2].plane, s->main_desc->comp[2].offset, s->main_desc->comp[2].step); |
| blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 2, hsub, vsub, x, y, main_has_alpha, |
| s->main_desc->comp[0].plane, s->main_desc->comp[0].offset, s->main_desc->comp[0].step); |
| |
| if (main_has_alpha) |
| alpha_composite(src, dst, src_w, src_h, dst_w, dst_h, x, y); |
| } |
| |
| static void blend_image_yuv420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y) |
| { |
| blend_image_yuv(ctx, dst, src, 1, 1, 0, x, y); |
| } |
| |
| static void blend_image_yuva420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y) |
| { |
| blend_image_yuv(ctx, dst, src, 1, 1, 1, x, y); |
| } |
| |
| static void blend_image_yuv422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y) |
| { |
| blend_image_yuv(ctx, dst, src, 1, 0, 0, x, y); |
| } |
| |
| static void blend_image_yuva422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y) |
| { |
| blend_image_yuv(ctx, dst, src, 1, 0, 1, x, y); |
| } |
| |
| static void blend_image_yuv444(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y) |
| { |
| blend_image_yuv(ctx, dst, src, 0, 0, 0, x, y); |
| } |
| |
| static void blend_image_yuva444(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y) |
| { |
| blend_image_yuv(ctx, dst, src, 0, 0, 1, x, y); |
| } |
| |
| static void blend_image_gbrp(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y) |
| { |
| blend_image_planar_rgb(ctx, dst, src, 0, 0, 0, x, y); |
| } |
| |
| static void blend_image_gbrap(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y) |
| { |
| blend_image_planar_rgb(ctx, dst, src, 0, 0, 1, x, y); |
| } |
| |
| static void blend_image_rgb(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y) |
| { |
| blend_image_packed_rgb(ctx, dst, src, 0, x, y); |
| } |
| |
| static void blend_image_rgba(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y) |
| { |
| blend_image_packed_rgb(ctx, dst, src, 1, x, y); |
| } |
| |
| static int config_input_main(AVFilterLink *inlink) |
| { |
| OverlayContext *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); |
| |
| 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 = ff_fmt_is_in(inlink->format, alpha_pix_fmts); |
| switch (s->format) { |
| case OVERLAY_FORMAT_YUV420: |
| s->blend_image = s->main_has_alpha ? blend_image_yuva420 : blend_image_yuv420; |
| break; |
| case OVERLAY_FORMAT_YUV422: |
| s->blend_image = s->main_has_alpha ? blend_image_yuva422 : blend_image_yuv422; |
| break; |
| case OVERLAY_FORMAT_YUV444: |
| s->blend_image = s->main_has_alpha ? blend_image_yuva444 : blend_image_yuv444; |
| break; |
| case OVERLAY_FORMAT_RGB: |
| s->blend_image = s->main_has_alpha ? blend_image_rgba : blend_image_rgb; |
| break; |
| case OVERLAY_FORMAT_GBRP: |
| s->blend_image = s->main_has_alpha ? blend_image_gbrap : blend_image_gbrp; |
| break; |
| case OVERLAY_FORMAT_AUTO: |
| switch (inlink->format) { |
| case AV_PIX_FMT_YUVA420P: |
| s->blend_image = blend_image_yuva420; |
| break; |
| case AV_PIX_FMT_YUVA422P: |
| s->blend_image = blend_image_yuva422; |
| break; |
| case AV_PIX_FMT_YUVA444P: |
| s->blend_image = blend_image_yuva444; |
| break; |
| case AV_PIX_FMT_ARGB: |
| case AV_PIX_FMT_RGBA: |
| case AV_PIX_FMT_BGRA: |
| case AV_PIX_FMT_ABGR: |
| s->blend_image = blend_image_rgba; |
| break; |
| case AV_PIX_FMT_GBRAP: |
| s->blend_image = blend_image_gbrap; |
| break; |
| default: |
| av_assert0(0); |
| break; |
| } |
| break; |
| } |
| return 0; |
| } |
| |
| static int do_blend(FFFrameSync *fs) |
| { |
| AVFilterContext *ctx = fs->parent; |
| AVFrame *mainpic, *second; |
| OverlayContext *s = ctx->priv; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| 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] = inlink->frame_count_out; |
| s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ? |
| NAN : mainpic->pts * av_q2d(inlink->time_base); |
| s->var_values[VAR_POS] = pos == -1 ? NAN : 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); |
| } |
| |
| if (s->x < mainpic->width && s->x + second->width >= 0 || |
| s->y < mainpic->height && s->y + second->height >= 0) |
| s->blend_image(ctx, mainpic, second, s->x, s->y); |
| return ff_filter_frame(ctx->outputs[0], mainpic); |
| } |
| |
| static av_cold int init(AVFilterContext *ctx) |
| { |
| OverlayContext *s = ctx->priv; |
| |
| s->fs.on_event = do_blend; |
| return 0; |
| } |
| |
| static int activate(AVFilterContext *ctx) |
| { |
| OverlayContext *s = ctx->priv; |
| return ff_framesync_activate(&s->fs); |
| } |
| |
| #define OFFSET(x) offsetof(OverlayContext, x) |
| #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| |
| static const AVOption overlay_options[] = { |
| { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, 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 }, |
| { "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" }, |
| { "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" }, |
| { "yuv422", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV422}, .flags = FLAGS, .unit = "format" }, |
| { "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" }, |
| { "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" }, |
| { "gbrp", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_GBRP}, .flags = FLAGS, .unit = "format" }, |
| { "auto", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_AUTO}, .flags = FLAGS, .unit = "format" }, |
| { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(fs.opt_repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS }, |
| { NULL } |
| }; |
| |
| FRAMESYNC_DEFINE_CLASS(overlay, OverlayContext, fs); |
| |
| static const AVFilterPad avfilter_vf_overlay_inputs[] = { |
| { |
| .name = "main", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_input_main, |
| }, |
| { |
| .name = "overlay", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_input_overlay, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad avfilter_vf_overlay_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_output, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_vf_overlay = { |
| .name = "overlay", |
| .description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."), |
| .preinit = overlay_framesync_preinit, |
| .init = init, |
| .uninit = uninit, |
| .priv_size = sizeof(OverlayContext), |
| .priv_class = &overlay_class, |
| .query_formats = query_formats, |
| .activate = activate, |
| .process_command = process_command, |
| .inputs = avfilter_vf_overlay_inputs, |
| .outputs = avfilter_vf_overlay_outputs, |
| .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, |
| }; |
