diff options
Diffstat (limited to 'libavfilter/vf_overlay.c')
-rw-r--r-- | libavfilter/vf_overlay.c | 739 |
1 files changed, 545 insertions, 194 deletions
diff --git a/libavfilter/vf_overlay.c b/libavfilter/vf_overlay.c index da2ddbe0a2..ec58dc4b66 100644 --- a/libavfilter/vf_overlay.c +++ b/libavfilter/vf_overlay.c @@ -3,20 +3,20 @@ * Copyright (c) 2010 Baptiste Coudurier * Copyright (c) 2007 Bobby Bingham * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -25,89 +25,261 @@ * overlay one video on top of another */ +/* #define DEBUG */ + #include "avfilter.h" #include "formats.h" #include "libavutil/common.h" #include "libavutil/eval.h" #include "libavutil/avstring.h" -#include "libavutil/avassert.h" +#include "libavutil/opt.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 "bufferqueue.h" +#include "drawutils.h" #include "video.h" static const char *const 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 + "hsub", + "vsub", + "x", + "y", + "n", ///< number of frame + "pos", ///< position in the file + "t", ///< timestamp expressed in seconds 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_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 + typedef struct { const AVClass *class; int x, y; ///< position of overlayed picture - int max_plane_step[4]; ///< steps per pixel for each plane + int allow_packed_rgb; + uint8_t frame_requested; + uint8_t overlay_eof; + 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; + enum OverlayFormat { OVERLAY_FORMAT_YUV420, OVERLAY_FORMAT_YUV444, OVERLAY_FORMAT_RGB, OVERLAY_FORMAT_NB} format; + enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode; + + AVFrame *overpicref; + struct FFBufQueue queue_main; + struct FFBufQueue queue_over; + + 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 + int shortest; ///< terminate stream when the shortest input terminates + int repeatlast; ///< repeat last overlay frame + double var_values[VAR_VARS_NB]; char *x_expr, *y_expr; - - AVFrame *main; - AVFrame *over_prev, *over_next; + AVExpr *x_pexpr, *y_pexpr; } OverlayContext; +static av_cold int init(AVFilterContext *ctx) +{ + OverlayContext *over = ctx->priv; + + if (over->allow_packed_rgb) { + av_log(ctx, AV_LOG_WARNING, + "The rgb option is deprecated and is overriding the format option, use format instead\n"); + over->format = OVERLAY_FORMAT_RGB; + } + return 0; +} + static av_cold void uninit(AVFilterContext *ctx) { - OverlayContext *s = ctx->priv; + OverlayContext *over = ctx->priv; - av_frame_free(&s->main); - av_frame_free(&s->over_prev); - av_frame_free(&s->over_next); + av_frame_free(&over->overpicref); + ff_bufqueue_discard_all(&over->queue_main); + ff_bufqueue_discard_all(&over->queue_over); + av_expr_free(over->x_pexpr); over->x_pexpr = NULL; + av_expr_free(over->y_pexpr); over->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 *over = ctx->priv; + + over->var_values[VAR_X] = av_expr_eval(over->x_pexpr, over->var_values, NULL); + over->var_values[VAR_Y] = av_expr_eval(over->y_pexpr, over->var_values, NULL); + over->var_values[VAR_X] = av_expr_eval(over->x_pexpr, over->var_values, NULL); + over->x = normalize_xy(over->var_values[VAR_X], over->hsub); + over->y = normalize_xy(over->var_values[VAR_Y], over->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 *over = ctx->priv; + int ret; + + if (!strcmp(cmd, "x")) + ret = set_expr(&over->x_pexpr, args, cmd, ctx); + else if (!strcmp(cmd, "y")) + ret = set_expr(&over->y_pexpr, args, cmd, ctx); + else + ret = AVERROR(ENOSYS); + + if (ret < 0) + return ret; + + if (over->eval_mode == EVAL_MODE_INIT) { + eval_expr(ctx); + av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n", + over->var_values[VAR_X], over->x, + over->var_values[VAR_Y], over->y); + } + return ret; } static int query_formats(AVFilterContext *ctx) { - const enum AVPixelFormat inout_pix_fmts[] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }; - const enum AVPixelFormat blend_pix_fmts[] = { AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE }; - AVFilterFormats *inout_formats = ff_make_format_list(inout_pix_fmts); - AVFilterFormats *blend_formats = ff_make_format_list(blend_pix_fmts); + OverlayContext *over = 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_YUVA420P, 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_yuv444[] = { + AV_PIX_FMT_YUV444P, 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_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; + AVFilterFormats *overlay_formats; + + switch (over->format) { + case OVERLAY_FORMAT_YUV420: + main_formats = ff_make_format_list(main_pix_fmts_yuv420); + overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420); + break; + case OVERLAY_FORMAT_YUV444: + main_formats = ff_make_format_list(main_pix_fmts_yuv444); + overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444); + break; + case OVERLAY_FORMAT_RGB: + main_formats = ff_make_format_list(main_pix_fmts_rgb); + overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb); + break; + default: + av_assert0(0); + } - ff_formats_ref(inout_formats, &ctx->inputs [MAIN ]->out_formats); - ff_formats_ref(blend_formats, &ctx->inputs [OVERLAY]->out_formats); - ff_formats_ref(inout_formats, &ctx->outputs[MAIN ]->in_formats ); + ff_formats_ref(main_formats, &ctx->inputs [MAIN ]->out_formats); + ff_formats_ref(overlay_formats, &ctx->inputs [OVERLAY]->out_formats); + ff_formats_ref(main_formats, &ctx->outputs[MAIN ]->in_formats ); return 0; } +static const enum AVPixelFormat alpha_pix_fmts[] = { + AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA444P, + AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA, + AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE +}; + static int config_input_main(AVFilterLink *inlink) { OverlayContext *over = inlink->dst->priv; const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format); - av_image_fill_max_pixsteps(over->max_plane_step, NULL, pix_desc); + av_image_fill_max_pixsteps(over->main_pix_step, NULL, pix_desc); + over->hsub = pix_desc->log2_chroma_w; over->vsub = pix_desc->log2_chroma_h; + over->main_is_packed_rgb = + ff_fill_rgba_map(over->main_rgba_map, inlink->format) >= 0; + over->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts); return 0; } @@ -115,60 +287,47 @@ 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; + const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format); + + av_image_fill_max_pixsteps(over->overlay_pix_step, NULL, pix_desc); /* 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; + over->var_values[VAR_MAIN_W ] = over->var_values[VAR_MW] = ctx->inputs[MAIN ]->w; + over->var_values[VAR_MAIN_H ] = over->var_values[VAR_MH] = ctx->inputs[MAIN ]->h; + over->var_values[VAR_OVERLAY_W] = over->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w; + over->var_values[VAR_OVERLAY_H] = over->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h; + over->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w; + over->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h; + over->var_values[VAR_X] = NAN; + over->var_values[VAR_Y] = NAN; + over->var_values[VAR_N] = 0; + over->var_values[VAR_T] = NAN; + over->var_values[VAR_POS] = NAN; + + if ((ret = set_expr(&over->x_pexpr, over->x_expr, "x", ctx)) < 0 || + (ret = set_expr(&over->y_pexpr, over->y_expr, "y", ctx)) < 0) + return ret; + + over->overlay_is_packed_rgb = + ff_fill_rgba_map(over->overlay_rgba_map, inlink->format) >= 0; + over->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts); + + if (over->eval_mode == EVAL_MODE_INIT) { + eval_expr(ctx); + av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n", + over->var_values[VAR_X], over->x, + over->var_values[VAR_Y], over->y); + } av_log(ctx, AV_LOG_VERBOSE, - "main w:%d h:%d fmt:%s overlay x:%d y:%d w:%d h:%d fmt:%s\n", + "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), - over->x, over->y, ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h, av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format)); - - 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) @@ -182,71 +341,196 @@ static int config_output(AVFilterLink *outlink) return 0; } -static void blend_frame(AVFilterContext *ctx, +// 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(AVFilterContext *ctx, AVFrame *dst, AVFrame *src, int x, int y) { OverlayContext *over = ctx->priv; - int i, j, k; - int width, height; - int overlay_end_y = y + src->height; - int end_y, start_y; - - width = FFMIN(dst->width - x, src->width); - end_y = FFMIN(dst->height, overlay_end_y); - start_y = FFMAX(y, 0); - height = end_y - start_y; - - if (dst->format == AV_PIX_FMT_BGR24 || dst->format == AV_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 == AV_PIX_FMT_BGR24 ? 2 : 0; - int r = dst->format == AV_PIX_FMT_BGR24 ? 0 : 2; - if (y < 0) - sp += -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; + int i, imax, j, jmax, k, kmax; + const int src_w = src->width; + const int src_h = src->height; + const int dst_w = dst->width; + const int dst_h = dst->height; + + if (x >= dst_w || x+dst_w < 0 || + y >= dst_h || y+dst_h < 0) + return; /* no intersection */ + + if (over->main_is_packed_rgb) { + uint8_t alpha; ///< the amount of overlay to blend on to main + const int dr = over->main_rgba_map[R]; + const int dg = over->main_rgba_map[G]; + const int db = over->main_rgba_map[B]; + const int da = over->main_rgba_map[A]; + const int dstep = over->main_pix_step[0]; + const int sr = over->overlay_rgba_map[R]; + const int sg = over->overlay_rgba_map[G]; + const int sb = over->overlay_rgba_map[B]; + const int sa = over->overlay_rgba_map[A]; + const int sstep = over->overlay_pix_step[0]; + const int main_has_alpha = over->main_has_alpha; + 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]; } } else { + const int main_has_alpha = over->main_has_alpha; + if (main_has_alpha) { + uint8_t alpha; ///< the amount of overlay to blend on to main + uint8_t *s, *sa, *d, *da; + + 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]; + } + } 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 (y < 0) { - sp += ((-y) >> vsub) * src->linesize[i]; - ap += -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 src_wp = FF_CEIL_RSHIFT(src_w, hsub); + int src_hp = FF_CEIL_RSHIFT(src_h, vsub); + int dst_wp = FF_CEIL_RSHIFT(dst_w, hsub); + int dst_hp = FF_CEIL_RSHIFT(dst_h, vsub); + int yp = y>>vsub; + int xp = x>>hsub; + uint8_t *s, *sp, *d, *dp, *a, *ap; + + j = FFMAX(-yp, 0); + sp = src->data[i] + j * src->linesize[i]; + dp = dst->data[i] + (yp+j) * dst->linesize[i]; + ap = src->data[3] + (j<<vsub) * src->linesize[3]; + + for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) { + k = FFMAX(-xp, 0); + d = dp + xp+k; + s = sp + k; + a = ap + (k<<hsub); + + for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) { int alpha_v, alpha_h, alpha; - if (hsub && vsub && j+1 < hp && k+1 < wp) { + + // 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 < wp ? + alpha_h = hsub && k+1 < src_wp ? (a[0] + a[1]) >> 1 : a[0]; - alpha_v = vsub && j+1 < hp ? + 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]; - *d = (*d * (0xff - alpha) + *s++ * alpha + 128) >> 8; + // 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 = (d[0] + d[src->linesize[3]] + + d[1] + d[src->linesize[3]+1]) >> 2; + } else if (hsub || vsub) { + alpha_h = hsub && k+1 < src_wp ? + (d[0] + d[1]) >> 1 : d[0]; + alpha_v = vsub && j+1 < src_hp ? + (d[0] + d[src->linesize[3]]) >> 1 : d[0]; + alpha_d = (alpha_v + alpha_h) >> 1; + } else + alpha_d = d[0]; + alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d); + } + *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha); + s++; d++; a += 1 << hsub; } @@ -258,127 +542,191 @@ static void blend_frame(AVFilterContext *ctx, } } -static int filter_frame_main(AVFilterLink *inlink, AVFrame *frame) +static int try_filter_frame(AVFilterContext *ctx, AVFrame *mainpic) { - OverlayContext *s = inlink->dst->priv; + OverlayContext *over = ctx->priv; + AVFilterLink *inlink = ctx->inputs[0]; + AVFrame *next_overpic; + int ret; - av_assert0(!s->main); - s->main = frame; + /* Discard obsolete overlay frames: if there is a next overlay frame with pts + * before the main frame, we can drop the current overlay. */ + while (1) { + next_overpic = ff_bufqueue_peek(&over->queue_over, 0); + if (!next_overpic && over->overlay_eof && !over->repeatlast) { + av_frame_free(&over->overpicref); + break; + } + if (!next_overpic || av_compare_ts(next_overpic->pts, ctx->inputs[OVERLAY]->time_base, + mainpic->pts , ctx->inputs[MAIN]->time_base) > 0) + break; + ff_bufqueue_get(&over->queue_over); + av_frame_free(&over->overpicref); + over->overpicref = next_overpic; + } - return 0; + /* If there is no next frame and no EOF and the overlay frame is before + * the main frame, we can not know yet if it will be superseded. */ + if (!over->queue_over.available && !over->overlay_eof && + (!over->overpicref || av_compare_ts(over->overpicref->pts, ctx->inputs[OVERLAY]->time_base, + mainpic->pts , ctx->inputs[MAIN]->time_base) < 0)) + return AVERROR(EAGAIN); + + /* At this point, we know that the current overlay frame extends to the + * time of the main frame. */ + av_dlog(ctx, "main_pts:%s main_pts_time:%s", + av_ts2str(mainpic->pts), av_ts2timestr(mainpic->pts, &ctx->inputs[MAIN]->time_base)); + if (over->overpicref) + av_dlog(ctx, " over_pts:%s over_pts_time:%s", + av_ts2str(over->overpicref->pts), av_ts2timestr(over->overpicref->pts, &ctx->inputs[OVERLAY]->time_base)); + av_dlog(ctx, "\n"); + + if (over->overpicref) { + if (over->eval_mode == EVAL_MODE_FRAME) { + int64_t pos = av_frame_get_pkt_pos(mainpic); + + over->var_values[VAR_N] = inlink->frame_count; + over->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ? + NAN : mainpic->pts * av_q2d(inlink->time_base); + over->var_values[VAR_POS] = pos == -1 ? NAN : pos; + + eval_expr(ctx); + av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n", + over->var_values[VAR_N], over->var_values[VAR_T], over->var_values[VAR_POS], + over->var_values[VAR_X], over->x, + over->var_values[VAR_Y], over->y); + } + if (!ctx->is_disabled) + blend_image(ctx, mainpic, over->overpicref, over->x, over->y); + + } + ret = ff_filter_frame(ctx->outputs[0], mainpic); + av_assert1(ret != AVERROR(EAGAIN)); + over->frame_requested = 0; + return ret; } -static int filter_frame_overlay(AVFilterLink *inlink, AVFrame *frame) +static int try_filter_next_frame(AVFilterContext *ctx) { - OverlayContext *s = inlink->dst->priv; + OverlayContext *over = ctx->priv; + AVFrame *next_mainpic = ff_bufqueue_peek(&over->queue_main, 0); + int ret; - av_assert0(!s->over_next); - s->over_next = frame; + if (!next_mainpic) + return AVERROR(EAGAIN); + if ((ret = try_filter_frame(ctx, next_mainpic)) == AVERROR(EAGAIN)) + return ret; + ff_bufqueue_get(&over->queue_main); + return ret; +} - return 0; +static int flush_frames(AVFilterContext *ctx) +{ + int ret; + + while (!(ret = try_filter_next_frame(ctx))); + return ret == AVERROR(EAGAIN) ? 0 : ret; } -static int output_frame(AVFilterContext *ctx) +static int filter_frame_main(AVFilterLink *inlink, AVFrame *inpicref) { - OverlayContext *s = ctx->priv; - AVFilterLink *outlink = ctx->outputs[0]; - int ret = ff_filter_frame(outlink, s->main); - s->main = NULL; + AVFilterContext *ctx = inlink->dst; + OverlayContext *over = ctx->priv; + int ret; - return ret; + if ((ret = flush_frames(ctx)) < 0) + return ret; + if ((ret = try_filter_frame(ctx, inpicref)) < 0) { + if (ret != AVERROR(EAGAIN)) + return ret; + ff_bufqueue_add(ctx, &over->queue_main, inpicref); + } + + if (!over->overpicref) + return 0; + flush_frames(ctx); + + return 0; } -static int handle_overlay_eof(AVFilterContext *ctx) +static int filter_frame_over(AVFilterLink *inlink, AVFrame *inpicref) { - OverlayContext *s = ctx->priv; - if (s->over_prev) - blend_frame(ctx, s->main, s->over_prev, s->x, s->y); - return output_frame(ctx); + AVFilterContext *ctx = inlink->dst; + OverlayContext *over = ctx->priv; + int ret; + + if ((ret = flush_frames(ctx)) < 0) + return ret; + ff_bufqueue_add(ctx, &over->queue_over, inpicref); + ret = try_filter_next_frame(ctx); + return ret == AVERROR(EAGAIN) ? 0 : ret; } static int request_frame(AVFilterLink *outlink) { AVFilterContext *ctx = outlink->src; - OverlayContext *s = ctx->priv; - AVRational tb_main = ctx->inputs[MAIN]->time_base; - AVRational tb_over = ctx->inputs[OVERLAY]->time_base; - int ret = 0; - - /* get a frame on the main input */ - if (!s->main) { - ret = ff_request_frame(ctx->inputs[MAIN]); + OverlayContext *over = ctx->priv; + int input, ret; + + if (!try_filter_next_frame(ctx)) + return 0; + over->frame_requested = 1; + while (over->frame_requested) { + /* TODO if we had a frame duration, we could guess more accurately */ + input = !over->overlay_eof && (over->queue_main.available || + over->queue_over.available < 2) ? + OVERLAY : MAIN; + ret = ff_request_frame(ctx->inputs[input]); + /* EOF on main is reported immediately */ + if (ret == AVERROR_EOF && input == OVERLAY) { + over->overlay_eof = 1; + if (over->shortest) + return ret; + if ((ret = try_filter_next_frame(ctx)) != AVERROR(EAGAIN)) + return ret; + ret = 0; /* continue requesting frames on main */ + } if (ret < 0) return ret; } - - /* get a new frame on the overlay input, on EOF - * reuse previous */ - if (!s->over_next) { - ret = ff_request_frame(ctx->inputs[OVERLAY]); - if (ret == AVERROR_EOF) - return handle_overlay_eof(ctx); - else if (ret < 0) - return ret; - } - - while (s->main->pts != AV_NOPTS_VALUE && - s->over_next->pts != AV_NOPTS_VALUE && - av_compare_ts(s->over_next->pts, tb_over, s->main->pts, tb_main) < 0) { - av_frame_free(&s->over_prev); - FFSWAP(AVFrame*, s->over_prev, s->over_next); - - ret = ff_request_frame(ctx->inputs[OVERLAY]); - if (ret == AVERROR_EOF) - return handle_overlay_eof(ctx); - else if (ret < 0) - return ret; - } - - if (s->main->pts == AV_NOPTS_VALUE || - s->over_next->pts == AV_NOPTS_VALUE || - !av_compare_ts(s->over_next->pts, tb_over, s->main->pts, tb_main)) { - blend_frame(ctx, s->main, s->over_next, s->x, s->y); - av_frame_free(&s->over_prev); - FFSWAP(AVFrame*, s->over_prev, s->over_next); - } else if (s->over_prev) { - blend_frame(ctx, s->main, s->over_prev, s->x, s->y); - } - - return output_frame(ctx); + return 0; } #define OFFSET(x) offsetof(OverlayContext, x) -#define FLAGS AV_OPT_FLAG_VIDEO_PARAM -static const AVOption options[] = { - { "x", "Horizontal position of the left edge of the overlaid video on the " - "main video.", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, - { "y", "Vertical position of the top edge of the overlaid video on the " - "main video.", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, - { NULL }, +#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 }, + { "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" }, + { "rgb", "force packed RGB in input and output (deprecated)", OFFSET(allow_packed_rgb), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, + { "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_INT, { .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" }, + { "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" }, + { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(repeatlast), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS }, + { NULL } }; -static const AVClass overlay_class = { - .class_name = "overlay", - .item_name = av_default_item_name, - .option = options, - .version = LIBAVUTIL_VERSION_INT, -}; +AVFILTER_DEFINE_CLASS(overlay); static const AVFilterPad avfilter_vf_overlay_inputs[] = { { .name = "main", .type = AVMEDIA_TYPE_VIDEO, + .get_video_buffer = ff_null_get_video_buffer, .config_props = config_input_main, .filter_frame = filter_frame_main, .needs_writable = 1, - .needs_fifo = 1, }, { .name = "overlay", .type = AVMEDIA_TYPE_VIDEO, .config_props = config_input_overlay, - .filter_frame = filter_frame_overlay, - .needs_fifo = 1, + .filter_frame = filter_frame_over, }, { NULL } }; @@ -397,13 +745,16 @@ 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), .priv_class = &overlay_class, .query_formats = query_formats, + .process_command = process_command, .inputs = avfilter_vf_overlay_inputs, .outputs = avfilter_vf_overlay_outputs, + .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, }; 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