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Mon, 30 Aug 2021 08:16:46 +0000 From: Soft Works To: "ffmpeg-devel@ffmpeg.org" Thread-Topic: [PATCH v2 4/8] avfilter/overlay_subs: Add overlay_subs filter Thread-Index: AdeddT2LfqP+ZxC3Rn6qBCTJTShc+A== Date: Mon, 30 Aug 2021 08:16:45 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-tmn: [5SqYNlDejJ4XofNqMpQxmgU0JABcW72x] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 153d1013-dd3d-45bb-3c16-08d96b8e8200 x-ms-traffictypediagnostic: MN2PR04MB5853: x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: E9/C9WX/SYIrK0/i9fColwzDBiltyQHJ4VKb98KXw7vmOMyK6tcdJEpJtlGfPm+482F3/dUMt8wuid4IoLdDJL0STDBMUp3wMgFwGc6PscU7PLCGMhkAwUH0hjW8M3B5++Vt4cjICAvZa3hIFMASXVqchFYpl//DWuxyGn0GdqUfEpOPt2MY0YghgvSGGi3f9yK8+zH0w4KHr4nzYYJ2ThonvC5aaqNPsbTFu0/mrfkp8xphXzm9E/FQ6pWqwTUspMbKnmRlRIq4OdHjYGiaV1jrIfMrWCKFWwbaLikJZYyYh/QfMdNiksjd3DtikCcB0hLEYwzw/kHzUSgtlhCH7wQQQVEF+R7lyn2iyiEbtT3LuksDDrho+QmozyHS0J/swj7glNyPiRY9DBn8yLkr2AzT+JFWwMmdRCQClfgcFwoFb/maygjdm5iKud8yq/nk x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: Qj5/uonQVb7q1hT2+ehIOJbvWOEuu11MUtmSO0q1w3EY8mhmY4w1KBFMZ/u5lMWnySDBp0pJ7lpQ1W51eGs+44f54ANdMELTvIWTSh6U9fs0sXaNH2wJKiaqTnIpQhQcmRcfkhQlTnl3g4/Yds2k4Q== x-ms-exchange-transport-forked: True MIME-Version: 1.0 X-OriginatorOrg: sct-15-20-3174-20-msonline-outlook-529c7.templateTenant X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MN2PR04MB5981.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: 153d1013-dd3d-45bb-3c16-08d96b8e8200 X-MS-Exchange-CrossTenant-originalarrivaltime: 30 Aug 2021 08:16:45.8778 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR04MB5853 Subject: [FFmpeg-devel] [PATCH v2 4/8] avfilter/overlay_subs: Add overlay_subs filter X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: cn6vo/5A8M9u Signed-off-by: softworkz --- v2 Update: - Implemented Andreas' suggestions - overlay_subs filter: - removed duplicated code - implemented direct (no pre-conversion) blending of graphical subtitle rects - Supported input formats: - all packed RGB formats (with and without alpha) - yuv420p, yuv422p, yuv444p libavfilter/Makefile | 1 + libavfilter/allfilters.c | 1 + libavfilter/vf_overlay_subs.c | 549 ++++++++++++++++++++++++++++++++++ libavfilter/vf_overlay_subs.h | 65 ++++ 4 files changed, 616 insertions(+) create mode 100644 libavfilter/vf_overlay_subs.c create mode 100644 libavfilter/vf_overlay_subs.h diff --git a/libavfilter/Makefile b/libavfilter/Makefile index 82a7394adb..8130f7b46c 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -357,6 +357,7 @@ 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_SUBS_FILTER) += vf_overlay_subs.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 73040d2824..abd0a47750 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -339,6 +339,7 @@ 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_subs; extern const AVFilter ff_vf_overlay_vulkan; extern const AVFilter ff_vf_overlay_cuda; extern const AVFilter ff_vf_owdenoise; diff --git a/libavfilter/vf_overlay_subs.c b/libavfilter/vf_overlay_subs.c new file mode 100644 index 0000000000..177f9b1cc9 --- /dev/null +++ b/libavfilter/vf_overlay_subs.c @@ -0,0 +1,549 @@ +/* + * Copyright (c) 2021 softworkz + * + * 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 "vf_overlay_subs.h" + +#include "libavcodec/avcodec.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 +}; + +#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 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 const enum AVPixelFormat alpha_pix_fmts[] = { + AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P, + AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, + AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA, + AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE +}; + +static int query_formats(AVFilterContext *ctx) +{ + 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 + }; + + return ff_set_common_formats(ctx, ff_make_format_list(supported_pix_fmts)); +} + +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). + */ +static av_always_inline void blend_packed_rgb(const AVFilterContext *ctx, + const AVFrame *dst, const AVSubtitleRect *src, + int main_has_alpha, 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]; + const int sstep = s->overlay_pix_step[0]; + uint32_t *pal = (uint32_t *)src->data[1]; + 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->data[0] + 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 * sstep); + d = dp + ((x + j) * dstep); + + for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) { + uint32_t val = 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 (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 (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 += sstep; + } + dp += dst->linesize[0]; + sp += src->linesize[0]; + } +} + +static av_always_inline void blend_plane_8_8bits(const AVFilterContext *ctx, const AVFrame *dst, const AVSubtitleRect *src, + 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) +{ + OverlaySubsContext *octx = ctx->priv; + 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; + int imax, i, j, jmax; + const int sstep = octx->overlay_pix_step[0]; + 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 = src->data[0] + slice_start * src->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 * sstep; + 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]; + + *d = (*d * (255 - alpha) + sval[plane] * alpha + 128) * 257 >> 16; + d += dst_step; + s += (1 << hsub); + } + dp += dst->linesize[dst_plane]; + sp += src->linesize[plane]; + 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 AVSubtitleRect *src, int hsub, int vsub, int x, int y) +{ + OverlaySubsContext *s = ctx->priv; + const int src_w = src->w; + const int src_h = src->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 *pal = (uint32_t *)src->data[1]; + uint32_t yuvpal[256]; + + for (int i = 0; i < 256; ++i) { + const uint8_t *rgba = (uint8_t *)&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, src, 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, src, 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, src, 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); + const AVPixFmtDescriptor *pix_desc_overlay = av_pix_fmt_desc_get(AV_PIX_FMT_PAL8); + + av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc); + av_image_fill_max_pixsteps(s->overlay_pix_step, NULL, pix_desc_overlay); + 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, inlink->format) >= 0; + s->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts); + + /* 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<log2_chroma_w; + s->var_values[VAR_VSUB] = 1<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]; + 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 (second->buf[0] && second->buf[0]->data) { + const AVSubtitle *sub = (AVSubtitle *)second->buf[0]->data; + unsigned num_rects, i; + + num_rects = sub->num_rects; + + for (i = 0; i < num_rects; i++) { + const AVSubtitleRect *sub_rect = sub->rects[i]; + + if (sub_rect->type != SUBTITLE_BITMAP) { + av_log(NULL, AV_LOG_WARNING, "sub2video: non-bitmap subtitle\n"); + return AVERROR_INVALIDDATA; + } + + switch (inlink->format) { + case AV_PIX_FMT_YUV420P: + blend_yuv_8_8bits(ctx, mainpic, sub_rect, 1, 1, sub_rect->x + s->x, sub_rect->y + s->y); + break; + case AV_PIX_FMT_YUV422P: + blend_yuv_8_8bits(ctx, mainpic, sub_rect, 1, 0, sub_rect->x + s->x, sub_rect->y + s->y); + break; + case AV_PIX_FMT_YUV444P: + blend_yuv_8_8bits(ctx, mainpic, sub_rect, 0, 0, sub_rect->x + s->x, sub_rect->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_rect, s->main_has_alpha, sub_rect->x + s->x, sub_rect->y + s->y, 1); + break; + default: + av_assert0(0); + break; + } + } + } + + return ff_filter_frame(ctx->outputs[0], mainpic); +} + +static av_cold int init(AVFilterContext *ctx) +{ + OverlaySubsContext *s = ctx->priv; + + s->fs.on_event = do_blend; + return 0; +} + +static int activate(AVFilterContext *ctx) +{ + OverlaySubsContext *s = ctx->priv; + return ff_framesync_activate(&s->fs); +} + +#define OFFSET(x) offsetof(OverlaySubsContext, x) +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM + +static const AVOption overlay_subs_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 } +}; + +FRAMESYNC_DEFINE_CLASS(overlay_subs, OverlaySubsContext, fs); + +static const AVFilterPad overlay_subs_inputs[] = { + { + .name = "main", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_input_main, + .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE, + }, + { + .name = "overlay", + .type = AVMEDIA_TYPE_SUBTITLE, + }, + { NULL } +}; + +static const AVFilterPad overlay_subs_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_output, + }, + { NULL } +}; + +const AVFilter ff_vf_overlay_subs = { + .name = "overlay_subs", + .description = NULL_IF_CONFIG_SMALL("Overlay graphical subtitles on top of the input."), + .preinit = overlay_subs_framesync_preinit, + .init = init, + .uninit = uninit, + .priv_size = sizeof(OverlaySubsContext), + .priv_class = &overlay_subs_class, + .query_formats = query_formats, + .activate = activate, + .inputs = overlay_subs_inputs, + .outputs = overlay_subs_outputs, +}; diff --git a/libavfilter/vf_overlay_subs.h b/libavfilter/vf_overlay_subs.h new file mode 100644 index 0000000000..08e8637bff --- /dev/null +++ b/libavfilter/vf_overlay_subs.h @@ -0,0 +1,65 @@ +/* + * 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 + */ + +#ifndef AVFILTER_OVERLAY_SUBS_H +#define AVFILTER_OVERLAY_SUBS_H + +#include "libavutil/eval.h" +#include "libavutil/pixdesc.h" +#include "framesync.h" +#include "avfilter.h" + +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 + + uint8_t main_is_packed_rgb; + uint8_t main_rgba_map[4]; + uint8_t 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 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; +} OverlaySubsContext; + +#endif /* AVFILTER_OVERLAY_SUBS_H */