| /* |
| * 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 "libavutil/eval.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/pixdesc.h" |
| #include "libavutil/imgutils.h" |
| #include "internal.h" |
| |
| static const char *var_names[] = { |
| "E", |
| "PHI", |
| "PI", |
| "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 |
| NULL |
| }; |
| |
| enum var_name { |
| VAR_E, |
| VAR_PHI, |
| VAR_PI, |
| VAR_MAIN_W, VAR_MW, |
| VAR_MAIN_H, VAR_MH, |
| VAR_OVERLAY_W, VAR_OW, |
| VAR_OVERLAY_H, VAR_OH, |
| VAR_VARS_NB |
| }; |
| |
| #define MAIN 0 |
| #define OVERLAY 1 |
| |
| typedef struct { |
| int x, y; ///< position of overlayed picture |
| |
| AVFilterBufferRef *overpicref; |
| |
| int max_plane_step[4]; ///< steps per pixel for each plane |
| int hsub, vsub; ///< chroma subsampling values |
| |
| char x_expr[256], y_expr[256]; |
| } OverlayContext; |
| |
| static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
| { |
| OverlayContext *over = ctx->priv; |
| |
| av_strlcpy(over->x_expr, "0", sizeof(over->x_expr)); |
| av_strlcpy(over->y_expr, "0", sizeof(over->y_expr)); |
| |
| if (args) |
| sscanf(args, "%255[^:]:%255[^:]", over->x_expr, over->y_expr); |
| |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| OverlayContext *over = ctx->priv; |
| |
| if (over->overpicref) |
| avfilter_unref_buffer(over->overpicref); |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| const enum PixelFormat inout_pix_fmts[] = { PIX_FMT_YUV420P, PIX_FMT_NONE }; |
| const enum PixelFormat blend_pix_fmts[] = { PIX_FMT_YUVA420P, PIX_FMT_NONE }; |
| AVFilterFormats *inout_formats = avfilter_make_format_list(inout_pix_fmts); |
| AVFilterFormats *blend_formats = avfilter_make_format_list(blend_pix_fmts); |
| |
| avfilter_formats_ref(inout_formats, &ctx->inputs [MAIN ]->out_formats); |
| avfilter_formats_ref(blend_formats, &ctx->inputs [OVERLAY]->out_formats); |
| avfilter_formats_ref(inout_formats, &ctx->outputs[MAIN ]->in_formats ); |
| |
| return 0; |
| } |
| |
| static int config_input_main(AVFilterLink *inlink) |
| { |
| OverlayContext *over = inlink->dst->priv; |
| const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format]; |
| |
| av_image_fill_max_pixsteps(over->max_plane_step, NULL, pix_desc); |
| over->hsub = pix_desc->log2_chroma_w; |
| over->vsub = pix_desc->log2_chroma_h; |
| |
| return 0; |
| } |
| |
| static int config_input_overlay(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| OverlayContext *over = inlink->dst->priv; |
| char *expr; |
| double var_values[VAR_VARS_NB], res; |
| int ret; |
| |
| /* Finish the configuration by evaluating the expressions |
| now when both inputs are configured. */ |
| var_values[VAR_E ] = M_E; |
| var_values[VAR_PHI] = M_PHI; |
| var_values[VAR_PI ] = M_PI; |
| |
| var_values[VAR_MAIN_W ] = var_values[VAR_MW] = ctx->inputs[MAIN ]->w; |
| var_values[VAR_MAIN_H ] = var_values[VAR_MH] = ctx->inputs[MAIN ]->h; |
| var_values[VAR_OVERLAY_W] = var_values[VAR_OW] = ctx->inputs[OVERLAY]->w; |
| var_values[VAR_OVERLAY_H] = var_values[VAR_OH] = ctx->inputs[OVERLAY]->h; |
| |
| if ((ret = av_expr_parse_and_eval(&res, (expr = over->x_expr), var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| goto fail; |
| over->x = res; |
| if ((ret = av_expr_parse_and_eval(&res, (expr = over->y_expr), var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx))) |
| goto fail; |
| over->y = res; |
| /* x may depend on y */ |
| if ((ret = av_expr_parse_and_eval(&res, (expr = over->x_expr), var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| goto fail; |
| over->x = res; |
| |
| av_log(ctx, AV_LOG_INFO, |
| "main w:%d h:%d fmt:%s overlay x:%d y:%d w:%d h:%d fmt:%s\n", |
| ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h, |
| av_pix_fmt_descriptors[ctx->inputs[MAIN]->format].name, |
| over->x, over->y, |
| ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h, |
| av_pix_fmt_descriptors[ctx->inputs[OVERLAY]->format].name); |
| |
| if (over->x < 0 || over->y < 0 || |
| over->x + var_values[VAR_OVERLAY_W] > var_values[VAR_MAIN_W] || |
| over->y + var_values[VAR_OVERLAY_H] > var_values[VAR_MAIN_H]) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Overlay area (%d,%d)<->(%d,%d) not within the main area (0,0)<->(%d,%d) or zero-sized\n", |
| over->x, over->y, |
| (int)(over->x + var_values[VAR_OVERLAY_W]), |
| (int)(over->y + var_values[VAR_OVERLAY_H]), |
| (int)var_values[VAR_MAIN_W], (int)var_values[VAR_MAIN_H]); |
| return AVERROR(EINVAL); |
| } |
| return 0; |
| |
| fail: |
| av_log(NULL, AV_LOG_ERROR, |
| "Error when evaluating the expression '%s'\n", expr); |
| return ret; |
| } |
| |
| static int config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| int exact; |
| // common timebase computation: |
| AVRational tb1 = ctx->inputs[MAIN ]->time_base; |
| AVRational tb2 = ctx->inputs[OVERLAY]->time_base; |
| AVRational *tb = &ctx->outputs[0]->time_base; |
| exact = av_reduce(&tb->num, &tb->den, |
| av_gcd((int64_t)tb1.num * tb2.den, |
| (int64_t)tb2.num * tb1.den), |
| (int64_t)tb1.den * tb2.den, INT_MAX); |
| av_log(ctx, AV_LOG_INFO, |
| "main_tb:%d/%d overlay_tb:%d/%d -> tb:%d/%d exact:%d\n", |
| tb1.num, tb1.den, tb2.num, tb2.den, tb->num, tb->den, exact); |
| if (!exact) |
| av_log(ctx, AV_LOG_WARNING, |
| "Timestamp conversion inexact, timestamp information loss may occurr\n"); |
| |
| outlink->w = ctx->inputs[MAIN]->w; |
| outlink->h = ctx->inputs[MAIN]->h; |
| |
| return 0; |
| } |
| |
| static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms, int w, int h) |
| { |
| return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h); |
| } |
| |
| static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref) |
| { |
| AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0); |
| AVFilterContext *ctx = inlink->dst; |
| OverlayContext *over = ctx->priv; |
| |
| inlink->dst->outputs[0]->out_buf = outpicref; |
| outpicref->pts = av_rescale_q(outpicref->pts, ctx->inputs[MAIN]->time_base, |
| ctx->outputs[0]->time_base); |
| |
| if (!over->overpicref || over->overpicref->pts < outpicref->pts) { |
| AVFilterBufferRef *old = over->overpicref; |
| over->overpicref = NULL; |
| avfilter_request_frame(ctx->inputs[OVERLAY]); |
| if (over->overpicref) { |
| if (old) |
| avfilter_unref_buffer(old); |
| } else |
| over->overpicref = old; |
| } |
| |
| avfilter_start_frame(inlink->dst->outputs[0], outpicref); |
| } |
| |
| static void start_frame_overlay(AVFilterLink *inlink, AVFilterBufferRef *inpicref) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| OverlayContext *over = ctx->priv; |
| |
| over->overpicref = inpicref; |
| over->overpicref->pts = av_rescale_q(inpicref->pts, ctx->inputs[OVERLAY]->time_base, |
| ctx->outputs[0]->time_base); |
| } |
| |
| static void blend_slice(AVFilterContext *ctx, |
| AVFilterBufferRef *dst, AVFilterBufferRef *src, |
| int x, int y, int w, int h, |
| int slice_y, int slice_w, int slice_h) |
| { |
| OverlayContext *over = ctx->priv; |
| int i, j, k; |
| int width, height; |
| int overlay_end_y = y+h; |
| int slice_end_y = slice_y+slice_h; |
| int end_y, start_y; |
| |
| width = FFMIN(slice_w - x, w); |
| end_y = FFMIN(slice_end_y, overlay_end_y); |
| start_y = FFMAX(y, slice_y); |
| height = end_y - start_y; |
| |
| if (dst->format == PIX_FMT_BGR24 || dst->format == PIX_FMT_RGB24) { |
| uint8_t *dp = dst->data[0] + x * 3 + start_y * dst->linesize[0]; |
| uint8_t *sp = src->data[0]; |
| int b = dst->format == PIX_FMT_BGR24 ? 2 : 0; |
| int r = dst->format == PIX_FMT_BGR24 ? 0 : 2; |
| if (slice_y > y) |
| sp += (slice_y - y) * src->linesize[0]; |
| for (i = 0; i < height; i++) { |
| uint8_t *d = dp, *s = sp; |
| for (j = 0; j < width; j++) { |
| d[r] = (d[r] * (0xff - s[3]) + s[0] * s[3] + 128) >> 8; |
| d[1] = (d[1] * (0xff - s[3]) + s[1] * s[3] + 128) >> 8; |
| d[b] = (d[b] * (0xff - s[3]) + s[2] * s[3] + 128) >> 8; |
| d += 3; |
| s += 4; |
| } |
| dp += dst->linesize[0]; |
| sp += src->linesize[0]; |
| } |
| } else { |
| for (i = 0; i < 3; i++) { |
| int hsub = i ? over->hsub : 0; |
| int vsub = i ? over->vsub : 0; |
| uint8_t *dp = dst->data[i] + (x >> hsub) + |
| (start_y >> vsub) * dst->linesize[i]; |
| uint8_t *sp = src->data[i]; |
| uint8_t *ap = src->data[3]; |
| int wp = FFALIGN(width, 1<<hsub) >> hsub; |
| int hp = FFALIGN(height, 1<<vsub) >> vsub; |
| if (slice_y > y) { |
| sp += ((slice_y - y) >> vsub) * src->linesize[i]; |
| ap += (slice_y - y) * src->linesize[3]; |
| } |
| for (j = 0; j < hp; j++) { |
| uint8_t *d = dp, *s = sp, *a = ap; |
| for (k = 0; k < wp; k++) { |
| // average alpha for color components, improve quality |
| int alpha_v, alpha_h, alpha; |
| if (hsub && vsub && j+1 < hp && k+1 < 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 < wp ? |
| (a[0] + a[1]) >> 1 : a[0]; |
| alpha_v = vsub && j+1 < hp ? |
| (a[0] + a[src->linesize[3]]) >> 1 : a[0]; |
| alpha = (alpha_v + alpha_h) >> 1; |
| } else |
| alpha = a[0]; |
| *d = (*d * (0xff - alpha) + *s++ * alpha + 128) >> 8; |
| d++; |
| a += 1 << hsub; |
| } |
| dp += dst->linesize[i]; |
| sp += src->linesize[i]; |
| ap += (1 << vsub) * src->linesize[3]; |
| } |
| } |
| } |
| } |
| |
| static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| AVFilterBufferRef *outpicref = outlink->out_buf; |
| OverlayContext *over = ctx->priv; |
| |
| if (over->overpicref && |
| !(over->x >= outpicref->video->w || over->y >= outpicref->video->h || |
| y+h < over->y || y >= over->y + over->overpicref->video->h)) { |
| blend_slice(ctx, outpicref, over->overpicref, over->x, over->y, |
| over->overpicref->video->w, over->overpicref->video->h, |
| y, outpicref->video->w, h); |
| } |
| avfilter_draw_slice(outlink, y, h, slice_dir); |
| } |
| |
| static void end_frame(AVFilterLink *inlink) |
| { |
| avfilter_end_frame(inlink->dst->outputs[0]); |
| avfilter_unref_buffer(inlink->cur_buf); |
| } |
| |
| static void null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { } |
| |
| static void null_end_frame(AVFilterLink *inlink) { } |
| |
| AVFilter avfilter_vf_overlay = { |
| .name = "overlay", |
| .description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."), |
| |
| .init = init, |
| .uninit = uninit, |
| |
| .priv_size = sizeof(OverlayContext), |
| |
| .query_formats = query_formats, |
| |
| .inputs = (AVFilterPad[]) {{ .name = "main", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .start_frame = start_frame, |
| .get_video_buffer= get_video_buffer, |
| .config_props = config_input_main, |
| .draw_slice = draw_slice, |
| .end_frame = end_frame, |
| .min_perms = AV_PERM_READ, |
| .rej_perms = AV_PERM_REUSE2|AV_PERM_PRESERVE, }, |
| { .name = "overlay", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .start_frame = start_frame_overlay, |
| .config_props = config_input_overlay, |
| .draw_slice = null_draw_slice, |
| .end_frame = null_end_frame, |
| .min_perms = AV_PERM_READ, |
| .rej_perms = AV_PERM_REUSE2, }, |
| { .name = NULL}}, |
| .outputs = (AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_output, }, |
| { .name = NULL}}, |
| }; |