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| 1 | +/* |
| 2 | + * Copyright (c) 2011 Baptiste Coudurier |
| 3 | + * Copyright (c) 2011 Stefano Sabatini |
| 4 | + * |
| 5 | + * This file is part of FFmpeg. |
| 6 | + * |
| 7 | + * FFmpeg is free software; you can redistribute it and/or |
| 8 | + * modify it under the terms of the GNU Lesser General Public |
| 9 | + * License as published by the Free Software Foundation; either |
| 10 | + * version 2.1 of the License, or (at your option) any later version. |
| 11 | + * |
| 12 | + * FFmpeg is distributed in the hope that it will be useful, |
| 13 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | + * Lesser General Public License for more details. |
| 16 | + * |
| 17 | + * You should have received a copy of the GNU Lesser General Public |
| 18 | + * License along with FFmpeg; if not, write to the Free Software |
| 19 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | + */ |
| 21 | + |
| 22 | +/** |
| 23 | + * @file |
| 24 | + * Libass subtitles burning filter. |
| 25 | + * |
| 26 | + * @see{http://www.matroska.org/technical/specs/subtitles/ssa.html} |
| 27 | + */ |
| 28 | + |
| 29 | +#include <ass/ass.h> |
| 30 | + |
| 31 | +#include "libavutil/avstring.h" |
| 32 | +#include "libavutil/imgutils.h" |
| 33 | +#include "libavutil/pixdesc.h" |
| 34 | +#include "drawutils.h" |
| 35 | +#include "avfilter.h" |
| 36 | + |
| 37 | +typedef struct { |
| 38 | + ASS_Library *library; |
| 39 | + ASS_Renderer *renderer; |
| 40 | + ASS_Track *track; |
| 41 | + int hsub, vsub; |
| 42 | + char *filename; |
| 43 | + uint8_t rgba_map[4]; |
| 44 | + int pix_step[4]; ///< steps per pixel for each plane of the main output |
| 45 | +} AssContext; |
| 46 | + |
| 47 | +/* libass supports a log level ranging from 0 to 7 */ |
| 48 | +int ass_libav_log_level_map[] = { |
| 49 | + AV_LOG_QUIET, /* 0 */ |
| 50 | + AV_LOG_PANIC, /* 1 */ |
| 51 | + AV_LOG_FATAL, /* 2 */ |
| 52 | + AV_LOG_ERROR, /* 3 */ |
| 53 | + AV_LOG_WARNING, /* 4 */ |
| 54 | + AV_LOG_INFO, /* 5 */ |
| 55 | + AV_LOG_VERBOSE, /* 6 */ |
| 56 | + AV_LOG_DEBUG, /* 7 */ |
| 57 | +}; |
| 58 | + |
| 59 | +static void ass_log(int ass_level, const char *fmt, va_list args, void *ctx) |
| 60 | +{ |
| 61 | + int level = ass_libav_log_level_map[ass_level]; |
| 62 | + |
| 63 | + av_vlog(ctx, level, fmt, args); |
| 64 | + av_log(ctx, level, "\n"); |
| 65 | +} |
| 66 | + |
| 67 | +static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
| 68 | +{ |
| 69 | + AssContext *ass = ctx->priv; |
| 70 | + |
| 71 | + if (args) |
| 72 | + ass->filename = av_get_token(&args, ":"); |
| 73 | + if (!ass->filename || !*ass->filename) { |
| 74 | + av_log(ctx, AV_LOG_ERROR, "No filename provided!\n"); |
| 75 | + return AVERROR(EINVAL); |
| 76 | + } |
| 77 | + |
| 78 | + ass->library = ass_library_init(); |
| 79 | + if (!ass->library) { |
| 80 | + av_log(ctx, AV_LOG_ERROR, "Could not initialize libass.\n"); |
| 81 | + return AVERROR(EINVAL); |
| 82 | + } |
| 83 | + ass_set_message_cb(ass->library, ass_log, ctx); |
| 84 | + |
| 85 | + ass->renderer = ass_renderer_init(ass->library); |
| 86 | + if (!ass->renderer) { |
| 87 | + av_log(ctx, AV_LOG_ERROR, "Could not initialize libass renderer.\n"); |
| 88 | + return AVERROR(EINVAL); |
| 89 | + } |
| 90 | + |
| 91 | + ass->track = ass_read_file(ass->library, ass->filename, NULL); |
| 92 | + if (!ass->track) { |
| 93 | + av_log(ctx, AV_LOG_ERROR, |
| 94 | + "Could not create a libass track when reading file '%s'\n", |
| 95 | + ass->filename); |
| 96 | + return AVERROR(EINVAL); |
| 97 | + } |
| 98 | + |
| 99 | + ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1); |
| 100 | + |
| 101 | + return 0; |
| 102 | +} |
| 103 | + |
| 104 | +static av_cold void uninit(AVFilterContext *ctx) |
| 105 | +{ |
| 106 | + AssContext *ass = ctx->priv; |
| 107 | + |
| 108 | + av_freep(&ass->filename); |
| 109 | + if (ass->track) |
| 110 | + ass_free_track(ass->track); |
| 111 | + if (ass->renderer) |
| 112 | + ass_renderer_done(ass->renderer); |
| 113 | + if (ass->library) |
| 114 | + ass_library_done(ass->library); |
| 115 | +} |
| 116 | + |
| 117 | +static int query_formats(AVFilterContext *ctx) |
| 118 | +{ |
| 119 | + static const enum PixelFormat pix_fmts[] = { |
| 120 | + PIX_FMT_ARGB, PIX_FMT_RGBA, |
| 121 | + PIX_FMT_ABGR, PIX_FMT_BGRA, |
| 122 | + PIX_FMT_RGB24, PIX_FMT_BGR24, |
| 123 | + PIX_FMT_NONE |
| 124 | + }; |
| 125 | + |
| 126 | + avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts)); |
| 127 | + |
| 128 | + return 0; |
| 129 | +} |
| 130 | + |
| 131 | +static int config_input(AVFilterLink *inlink) |
| 132 | +{ |
| 133 | + AssContext *ass = inlink->dst->priv; |
| 134 | + const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format]; |
| 135 | + double sar = inlink->sample_aspect_ratio.num ? |
| 136 | + av_q2d(inlink->sample_aspect_ratio) : 1; |
| 137 | + double dar = inlink->w / inlink->h * sar; |
| 138 | + |
| 139 | + av_image_fill_max_pixsteps(ass->pix_step, NULL, pix_desc); |
| 140 | + ff_fill_rgba_map(ass->rgba_map, inlink->format); |
| 141 | + |
| 142 | + ass->hsub = pix_desc->log2_chroma_w; |
| 143 | + ass->vsub = pix_desc->log2_chroma_h; |
| 144 | + |
| 145 | + ass_set_frame_size (ass->renderer, inlink->w, inlink->h); |
| 146 | + ass_set_aspect_ratio(ass->renderer, dar, sar); |
| 147 | + |
| 148 | + return 0; |
| 149 | +} |
| 150 | + |
| 151 | +static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { } |
| 152 | + |
| 153 | +#define R 0 |
| 154 | +#define G 1 |
| 155 | +#define B 2 |
| 156 | +#define A 3 |
| 157 | + |
| 158 | +#define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off) { \ |
| 159 | + p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \ |
| 160 | + alpha = rgba_color[A] * (val) * 129; \ |
| 161 | + *(p+r_off) = (alpha * rgba_color[R] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \ |
| 162 | + *(p+g_off) = (alpha * rgba_color[G] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \ |
| 163 | + *(p+b_off) = (alpha * rgba_color[B] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \ |
| 164 | +} |
| 165 | + |
| 166 | +/* libass stores an RGBA color in the format RRGGBBTT, where TT is the transparency level */ |
| 167 | +#define AR(c) ( (c)>>24) |
| 168 | +#define AG(c) (((c)>>16)&0xFF) |
| 169 | +#define AB(c) (((c)>>8) &0xFF) |
| 170 | +#define AA(c) ((0xFF-c) &0xFF) |
| 171 | + |
| 172 | +static void overlay_ass_image(AVFilterBufferRef *picref, const uint8_t *rgba_map, const int pix_step, |
| 173 | + const ASS_Image *image) |
| 174 | +{ |
| 175 | + int i, j; |
| 176 | + int alpha; |
| 177 | + uint8_t *p; |
| 178 | + const int ro = rgba_map[R]; |
| 179 | + const int go = rgba_map[G]; |
| 180 | + const int bo = rgba_map[B]; |
| 181 | + |
| 182 | + for (; image; image = image->next) { |
| 183 | + uint8_t rgba_color[] = {AR(image->color), AG(image->color), AB(image->color), AA(image->color)}; |
| 184 | + unsigned char *row = image->bitmap; |
| 185 | + |
| 186 | + for (i = 0; i < image->h; i++) { |
| 187 | + for (j = 0; j < image->w; j++) { |
| 188 | + if (row[j]) { |
| 189 | + SET_PIXEL_RGB(picref, rgba_color, row[j], image->dst_x + j, image->dst_y + i, pix_step, ro, go, bo); |
| 190 | + } |
| 191 | + } |
| 192 | + row += image->stride; |
| 193 | + } |
| 194 | + } |
| 195 | +} |
| 196 | + |
| 197 | +static void end_frame(AVFilterLink *inlink) |
| 198 | +{ |
| 199 | + AVFilterContext *ctx = inlink->dst; |
| 200 | + AVFilterLink *outlink = ctx->outputs[0]; |
| 201 | + AssContext *ass = ctx->priv; |
| 202 | + AVFilterBufferRef *picref = inlink->cur_buf; |
| 203 | + int detect_change = 0; |
| 204 | + double time_ms = picref->pts * av_q2d(inlink->time_base) * 1000; |
| 205 | + ASS_Image *image = ass_render_frame(ass->renderer, ass->track, |
| 206 | + time_ms, &detect_change); |
| 207 | + |
| 208 | + if (detect_change) |
| 209 | + av_log(ctx, AV_LOG_DEBUG, "Change happened at time ms:%f\n", time_ms); |
| 210 | + |
| 211 | + overlay_ass_image(picref, ass->rgba_map, ass->pix_step[0], image); |
| 212 | + |
| 213 | + avfilter_draw_slice(outlink, 0, picref->video->h, 1); |
| 214 | + avfilter_end_frame(outlink); |
| 215 | +} |
| 216 | + |
| 217 | +AVFilter avfilter_vf_ass = { |
| 218 | + .name = "ass", |
| 219 | + .description = NULL_IF_CONFIG_SMALL("Render subtitles onto input video using the libass library."), |
| 220 | + .priv_size = sizeof(AssContext), |
| 221 | + .init = init, |
| 222 | + .uninit = uninit, |
| 223 | + .query_formats = query_formats, |
| 224 | + |
| 225 | + .inputs = (const AVFilterPad[]) { |
| 226 | + { .name = "default", |
| 227 | + .type = AVMEDIA_TYPE_VIDEO, |
| 228 | + .get_video_buffer = avfilter_null_get_video_buffer, |
| 229 | + .start_frame = avfilter_null_start_frame, |
| 230 | + .draw_slice = null_draw_slice, |
| 231 | + .end_frame = end_frame, |
| 232 | + .config_props = config_input, |
| 233 | + .min_perms = AV_PERM_WRITE | AV_PERM_READ, |
| 234 | + .rej_perms = AV_PERM_PRESERVE }, |
| 235 | + { .name = NULL} |
| 236 | + }, |
| 237 | + .outputs = (const AVFilterPad[]) { |
| 238 | + { .name = "default", |
| 239 | + .type = AVMEDIA_TYPE_VIDEO, }, |
| 240 | + { .name = NULL} |
| 241 | + }, |
| 242 | +}; |