Signed-off-by: SomeRGuy <wwaka...@gmail.com>
---
libavfilter/vf_subtitles.c | 991 +++++++++++++++++++------------------
1 file changed, 499 insertions(+), 492 deletions(-)
diff --git a/libavfilter/vf_subtitles.c b/libavfilter/vf_subtitles.c
index f08a7fba9d..511722199c 100644
--- a/libavfilter/vf_subtitles.c
+++ b/libavfilter/vf_subtitles.c
@@ -1,492 +1,499 @@
-/*
- * Copyright (c) 2011 Baptiste Coudurier
- * Copyright (c) 2011 Stefano Sabatini
- * Copyright (c) 2012 Clément Bœsch
- *
- * 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
- * Libass subtitles burning filter.
- *
- * @see{http://www.matroska.org/technical/specs/subtitles/ssa.html}
- */
-
-#include <ass/ass.h>
-
-#include "config.h"
-#if CONFIG_SUBTITLES_FILTER
-# include "libavcodec/avcodec.h"
-# include "libavformat/avformat.h"
-#endif
-#include "libavutil/avstring.h"
-#include "libavutil/imgutils.h"
-#include "libavutil/opt.h"
-#include "libavutil/parseutils.h"
-#include "drawutils.h"
-#include "avfilter.h"
-#include "internal.h"
-#include "formats.h"
-#include "video.h"
-
-typedef struct AssContext {
- const AVClass *class;
- ASS_Library *library;
- ASS_Renderer *renderer;
- ASS_Track *track;
- char *filename;
- char *fontsdir;
- char *charenc;
- char *force_style;
- int stream_index;
- int alpha;
- uint8_t rgba_map[4];
- int pix_step[4]; ///< steps per pixel for each plane of the main
output
- int original_w, original_h;
- int shaping;
- FFDrawContext draw;
-} AssContext;
-
-#define OFFSET(x) offsetof(AssContext, x)
-#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
-
-#define COMMON_OPTIONS \
- {"filename", "set the filename of file to read",
OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, \
- {"f", "set the filename of file to read",
OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, \
- {"original_size", "set the size of the original video (used to scale
fonts)", OFFSET(original_w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0,
FLAGS }, \
- {"fontsdir", "set the directory containing the fonts to read",
OFFSET(fontsdir), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, \
- {"alpha", "enable processing of alpha channel",
OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0,
1, FLAGS }, \
-
-/* libass supports a log level ranging from 0 to 7 */
-static const int ass_libavfilter_log_level_map[] = {
- [0] = AV_LOG_FATAL, /* MSGL_FATAL */
- [1] = AV_LOG_ERROR, /* MSGL_ERR */
- [2] = AV_LOG_WARNING, /* MSGL_WARN */
- [3] = AV_LOG_WARNING, /* <undefined> */
- [4] = AV_LOG_INFO, /* MSGL_INFO */
- [5] = AV_LOG_INFO, /* <undefined> */
- [6] = AV_LOG_VERBOSE, /* MSGL_V */
- [7] = AV_LOG_DEBUG, /* MSGL_DBG2 */
-};
-
-static void ass_log(int ass_level, const char *fmt, va_list args, void *ctx)
-{
- const int ass_level_clip = av_clip(ass_level, 0,
- FF_ARRAY_ELEMS(ass_libavfilter_log_level_map) - 1);
- const int level = ass_libavfilter_log_level_map[ass_level_clip];
-
- av_vlog(ctx, level, fmt, args);
- av_log(ctx, level, "\n");
-}
-
-static av_cold int init(AVFilterContext *ctx)
-{
- AssContext *ass = ctx->priv;
-
- if (!ass->filename) {
- av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
- return AVERROR(EINVAL);
- }
-
- ass->library = ass_library_init();
- if (!ass->library) {
- av_log(ctx, AV_LOG_ERROR, "Could not initialize libass.\n");
- return AVERROR(EINVAL);
- }
- ass_set_message_cb(ass->library, ass_log, ctx);
-
- ass_set_fonts_dir(ass->library, ass->fontsdir);
- ass_set_extract_fonts(ass->library, 1);
-
- ass->renderer = ass_renderer_init(ass->library);
- if (!ass->renderer) {
- av_log(ctx, AV_LOG_ERROR, "Could not initialize libass renderer.\n");
- return AVERROR(EINVAL);
- }
-
- return 0;
-}
-
-static av_cold void uninit(AVFilterContext *ctx)
-{
- AssContext *ass = ctx->priv;
-
- if (ass->track)
- ass_free_track(ass->track);
- if (ass->renderer)
- ass_renderer_done(ass->renderer);
- if (ass->library)
- ass_library_done(ass->library);
-}
-
-static int query_formats(AVFilterContext *ctx)
-{
- return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
-}
-
-static int config_input(AVFilterLink *inlink)
-{
- AssContext *ass = inlink->dst->priv;
-
- ff_draw_init(&ass->draw, inlink->format, ass->alpha ?
FF_DRAW_PROCESS_ALPHA : 0);
-
- ass_set_frame_size (ass->renderer, inlink->w, inlink->h);
- if (ass->original_w && ass->original_h)
- ass_set_aspect_ratio(ass->renderer, (double)inlink->w / inlink->h,
- (double)ass->original_w / ass->original_h);
- if (ass->shaping != -1)
- ass_set_shaper(ass->renderer, ass->shaping);
-
- return 0;
-}
-
-/* libass stores an RGBA color in the format RRGGBBTT, where TT is the
transparency level */
-#define AR(c) ( (c)>>24)
-#define AG(c) (((c)>>16)&0xFF)
-#define AB(c) (((c)>>8) &0xFF)
-#define AA(c) ((0xFF-(c)) &0xFF)
-
-static void overlay_ass_image(AssContext *ass, AVFrame *picref,
- const ASS_Image *image)
-{
- for (; image; image = image->next) {
- uint8_t rgba_color[] = {AR(image->color), AG(image->color),
AB(image->color), AA(image->color)};
- FFDrawColor color;
- ff_draw_color(&ass->draw, &color, rgba_color);
- ff_blend_mask(&ass->draw, &color,
- picref->data, picref->linesize,
- picref->width, picref->height,
- image->bitmap, image->stride, image->w, image->h,
- 3, 0, image->dst_x, image->dst_y);
- }
-}
-
-static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
-{
- AVFilterContext *ctx = inlink->dst;
- AVFilterLink *outlink = ctx->outputs[0];
- AssContext *ass = ctx->priv;
- int detect_change = 0;
- double time_ms = picref->pts * av_q2d(inlink->time_base) * 1000;
- ASS_Image *image = ass_render_frame(ass->renderer, ass->track,
- time_ms, &detect_change);
-
- if (detect_change)
- av_log(ctx, AV_LOG_DEBUG, "Change happened at time ms:%f\n", time_ms);
-
- overlay_ass_image(ass, picref, image);
-
- return ff_filter_frame(outlink, picref);
-}
-
-static const AVFilterPad ass_inputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
- .filter_frame = filter_frame,
- .config_props = config_input,
- },
-};
-
-static const AVFilterPad ass_outputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- },
-};
-
-#if CONFIG_ASS_FILTER
-
-static const AVOption ass_options[] = {
- COMMON_OPTIONS
- {"shaping", "set shaping engine", OFFSET(shaping), AV_OPT_TYPE_INT, { .i64
= -1 }, -1, 1, FLAGS, "shaping_mode"},
- {"auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = -1},
INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
- {"simple", "simple shaping", 0, AV_OPT_TYPE_CONST, {.i64 =
ASS_SHAPING_SIMPLE}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
- {"complex", "complex shaping", 0, AV_OPT_TYPE_CONST, {.i64 =
ASS_SHAPING_COMPLEX}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
- {NULL},
-};
-
-AVFILTER_DEFINE_CLASS(ass);
-
-static av_cold int init_ass(AVFilterContext *ctx)
-{
- AssContext *ass = ctx->priv;
- int ret = init(ctx);
-
- if (ret < 0)
- return ret;
-
- /* Initialize fonts */
- ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
-
- ass->track = ass_read_file(ass->library, ass->filename, NULL);
- if (!ass->track) {
- av_log(ctx, AV_LOG_ERROR,
- "Could not create a libass track when reading file '%s'\n",
- ass->filename);
- return AVERROR(EINVAL);
- }
- return 0;
-}
-
-const AVFilter ff_vf_ass = {
- .name = "ass",
- .description = NULL_IF_CONFIG_SMALL("Render ASS subtitles onto input
video using the libass library."),
- .priv_size = sizeof(AssContext),
- .init = init_ass,
- .uninit = uninit,
- .query_formats = query_formats,
- FILTER_INPUTS(ass_inputs),
- FILTER_OUTPUTS(ass_outputs),
- .priv_class = &ass_class,
-};
-#endif
-
-#if CONFIG_SUBTITLES_FILTER
-
-static const AVOption subtitles_options[] = {
- COMMON_OPTIONS
- {"charenc", "set input character encoding", OFFSET(charenc),
AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS},
- {"stream_index", "set stream index", OFFSET(stream_index),
AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
- {"si", "set stream index", OFFSET(stream_index),
AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
- {"force_style", "force subtitle style", OFFSET(force_style),
AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS},
- {NULL},
-};
-
-static const char * const font_mimetypes[] = {
- "application/x-truetype-font",
- "application/vnd.ms-opentype",
- "application/x-font-ttf",
- NULL
-};
-
-static int attachment_is_font(AVStream * st)
-{
- const AVDictionaryEntry *tag = NULL;
- int n;
-
- tag = av_dict_get(st->metadata, "mimetype", NULL, AV_DICT_MATCH_CASE);
-
- if (tag) {
- for (n = 0; font_mimetypes[n]; n++) {
- if (av_strcasecmp(font_mimetypes[n], tag->value) == 0)
- return 1;
- }
- }
- return 0;
-}
-
-AVFILTER_DEFINE_CLASS(subtitles);
-
-static av_cold int init_subtitles(AVFilterContext *ctx)
-{
- int j, ret, sid;
- int k = 0;
- AVDictionary *codec_opts = NULL;
- AVFormatContext *fmt = NULL;
- AVCodecContext *dec_ctx = NULL;
- const AVCodec *dec;
- const AVCodecDescriptor *dec_desc;
- AVStream *st;
- AVPacket pkt;
- AssContext *ass = ctx->priv;
-
- /* Init libass */
- ret = init(ctx);
- if (ret < 0)
- return ret;
- ass->track = ass_new_track(ass->library);
- if (!ass->track) {
- av_log(ctx, AV_LOG_ERROR, "Could not create a libass track\n");
- return AVERROR(EINVAL);
- }
-
- /* Open subtitles file */
- ret = avformat_open_input(&fmt, ass->filename, NULL, NULL);
- if (ret < 0) {
- av_log(ctx, AV_LOG_ERROR, "Unable to open %s\n", ass->filename);
- goto end;
- }
- ret = avformat_find_stream_info(fmt, NULL);
- if (ret < 0)
- goto end;
-
- /* Locate subtitles stream */
- if (ass->stream_index < 0)
- ret = av_find_best_stream(fmt, AVMEDIA_TYPE_SUBTITLE, -1, -1, NULL, 0);
- else {
- ret = -1;
- if (ass->stream_index < fmt->nb_streams) {
- for (j = 0; j < fmt->nb_streams; j++) {
- if (fmt->streams[j]->codecpar->codec_type ==
AVMEDIA_TYPE_SUBTITLE) {
- if (ass->stream_index == k) {
- ret = j;
- break;
- }
- k++;
- }
- }
- }
- }
-
- if (ret < 0) {
- av_log(ctx, AV_LOG_ERROR, "Unable to locate subtitle stream in %s\n",
- ass->filename);
- goto end;
- }
- sid = ret;
- st = fmt->streams[sid];
-
- /* Load attached fonts */
- for (j = 0; j < fmt->nb_streams; j++) {
- AVStream *st = fmt->streams[j];
- if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT &&
- attachment_is_font(st)) {
- const AVDictionaryEntry *tag = NULL;
- tag = av_dict_get(st->metadata, "filename", NULL,
- AV_DICT_MATCH_CASE);
-
- if (tag) {
- av_log(ctx, AV_LOG_DEBUG, "Loading attached font: %s\n",
- tag->value);
- ass_add_font(ass->library, tag->value,
- st->codecpar->extradata,
- st->codecpar->extradata_size);
- } else {
- av_log(ctx, AV_LOG_WARNING,
- "Font attachment has no filename, ignored.\n");
- }
- }
- }
-
- /* Initialize fonts */
- ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
-
- /* Open decoder */
- dec = avcodec_find_decoder(st->codecpar->codec_id);
- if (!dec) {
- av_log(ctx, AV_LOG_ERROR, "Failed to find subtitle codec %s\n",
- avcodec_get_name(st->codecpar->codec_id));
- ret = AVERROR_DECODER_NOT_FOUND;
- goto end;
- }
- dec_desc = avcodec_descriptor_get(st->codecpar->codec_id);
- if (dec_desc && !(dec_desc->props & AV_CODEC_PROP_TEXT_SUB)) {
- av_log(ctx, AV_LOG_ERROR,
- "Only text based subtitles are currently supported\n");
- ret = AVERROR_PATCHWELCOME;
- goto end;
- }
- if (ass->charenc)
- av_dict_set(&codec_opts, "sub_charenc", ass->charenc, 0);
-
- dec_ctx = avcodec_alloc_context3(dec);
- if (!dec_ctx) {
- ret = AVERROR(ENOMEM);
- goto end;
- }
-
- ret = avcodec_parameters_to_context(dec_ctx, st->codecpar);
- if (ret < 0)
- goto end;
-
- /*
- * This is required by the decoding process in order to rescale the
- * timestamps: in the current API the decoded subtitles have their pts
- * expressed in AV_TIME_BASE, and thus the lavc internals need to know the
- * stream time base in order to achieve the rescaling.
- *
- * That API is old and needs to be reworked to match behaviour with A/V.
- */
- dec_ctx->pkt_timebase = st->time_base;
-
- ret = avcodec_open2(dec_ctx, NULL, &codec_opts);
- if (ret < 0)
- goto end;
-
- if (ass->force_style) {
- char **list = NULL;
- char *temp = NULL;
- char *ptr = av_strtok(ass->force_style, ",", &temp);
- int i = 0;
- while (ptr) {
- av_dynarray_add(&list, &i, ptr);
- if (!list) {
- ret = AVERROR(ENOMEM);
- goto end;
- }
- ptr = av_strtok(NULL, ",", &temp);
- }
- av_dynarray_add(&list, &i, NULL);
- if (!list) {
- ret = AVERROR(ENOMEM);
- goto end;
- }
- ass_set_style_overrides(ass->library, list);
- av_free(list);
- }
- /* Decode subtitles and push them into the renderer (libass) */
- if (dec_ctx->subtitle_header)
- ass_process_codec_private(ass->track,
- dec_ctx->subtitle_header,
- dec_ctx->subtitle_header_size);
- while (av_read_frame(fmt, &pkt) >= 0) {
- int i, got_subtitle;
- AVSubtitle sub = {0};
-
- if (pkt.stream_index == sid) {
- ret = avcodec_decode_subtitle2(dec_ctx, &sub, &got_subtitle, &pkt);
- if (ret < 0) {
- av_log(ctx, AV_LOG_WARNING, "Error decoding: %s (ignored)\n",
- av_err2str(ret));
- } else if (got_subtitle) {
- const int64_t start_time = av_rescale_q(sub.pts,
AV_TIME_BASE_Q, av_make_q(1, 1000));
- const int64_t duration = sub.end_display_time;
- for (i = 0; i < sub.num_rects; i++) {
- char *ass_line = sub.rects[i]->ass;
- if (!ass_line)
- break;
- ass_process_chunk(ass->track, ass_line, strlen(ass_line),
- start_time, duration);
- }
- }
- }
- av_packet_unref(&pkt);
- avsubtitle_free(&sub);
- }
-
-end:
- av_dict_free(&codec_opts);
- avcodec_free_context(&dec_ctx);
- avformat_close_input(&fmt);
- return ret;
-}
-
-const AVFilter ff_vf_subtitles = {
- .name = "subtitles",
- .description = NULL_IF_CONFIG_SMALL("Render text subtitles onto input
video using the libass library."),
- .priv_size = sizeof(AssContext),
- .init = init_subtitles,
- .uninit = uninit,
- .query_formats = query_formats,
- FILTER_INPUTS(ass_inputs),
- FILTER_OUTPUTS(ass_outputs),
- .priv_class = &subtitles_class,
-};
-#endif
+/*
+ * Copyright (c) 2011 Baptiste Coudurier
+ * Copyright (c) 2011 Stefano Sabatini
+ * Copyright (c) 2012 Clément Bœsch
+ *
+ * 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
+ * Libass subtitles burning filter.
+ *
+ * @see{http://www.matroska.org/technical/specs/subtitles/ssa.html}
+ */
+
+#include <ass/ass.h>
+
+#include "config.h"
+#if CONFIG_SUBTITLES_FILTER
+# include "libavcodec/avcodec.h"
+# include "libavformat/avformat.h"
+#endif
+#include "libavutil/avstring.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "drawutils.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "formats.h"
+#include "video.h"
+
+typedef struct AssContext {
+ const AVClass *class;
+ ASS_Library *library;
+ ASS_Renderer *renderer;
+ ASS_Track *track;
+ char *filename;
+ char *fontsdir;
+ char *charenc;
+ char *force_style;
+ int stream_index;
+ int alpha;
+ uint8_t rgba_map[4];
+ int pix_step[4]; ///< steps per pixel for each plane of the main
output
+ int original_w, original_h;
+ int shaping;
+ FFDrawContext draw;
+} AssContext;
+
+#define OFFSET(x) offsetof(AssContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+#define COMMON_OPTIONS \
+ {"filename", "set the filename of file to read",
OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, \
+ {"f", "set the filename of file to read",
OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, \
+ {"original_size", "set the size of the original video (used to scale
fonts)", OFFSET(original_w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0,
FLAGS }, \
+ {"fontsdir", "set the directory containing the fonts to read",
OFFSET(fontsdir), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, \
+ {"alpha", "enable processing of alpha channel",
OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0,
1, FLAGS }, \
+
+/* libass supports a log level ranging from 0 to 7 */
+static const int ass_libavfilter_log_level_map[] = {
+ [0] = AV_LOG_FATAL, /* MSGL_FATAL */
+ [1] = AV_LOG_ERROR, /* MSGL_ERR */
+ [2] = AV_LOG_WARNING, /* MSGL_WARN */
+ [3] = AV_LOG_WARNING, /* <undefined> */
+ [4] = AV_LOG_INFO, /* MSGL_INFO */
+ [5] = AV_LOG_INFO, /* <undefined> */
+ [6] = AV_LOG_VERBOSE, /* MSGL_V */
+ [7] = AV_LOG_DEBUG, /* MSGL_DBG2 */
+};
+
+static void ass_log(int ass_level, const char *fmt, va_list args, void *ctx)
+{
+ const int ass_level_clip = av_clip(ass_level, 0,
+ FF_ARRAY_ELEMS(ass_libavfilter_log_level_map) - 1);
+ const int level = ass_libavfilter_log_level_map[ass_level_clip];
+
+ av_vlog(ctx, level, fmt, args);
+ av_log(ctx, level, "\n");
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ AssContext *ass = ctx->priv;
+
+ if (!ass->filename) {
+ av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
+ return AVERROR(EINVAL);
+ }
+
+ ass->library = ass_library_init();
+ if (!ass->library) {
+ av_log(ctx, AV_LOG_ERROR, "Could not initialize libass.\n");
+ return AVERROR(EINVAL);
+ }
+ ass_set_message_cb(ass->library, ass_log, ctx);
+
+ ass_set_fonts_dir(ass->library, ass->fontsdir);
+ ass_set_extract_fonts(ass->library, 1);
+
+ ass->renderer = ass_renderer_init(ass->library);
+ if (!ass->renderer) {
+ av_log(ctx, AV_LOG_ERROR, "Could not initialize libass renderer.\n");
+ return AVERROR(EINVAL);
+ }
+
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ AssContext *ass = ctx->priv;
+
+ if (ass->track)
+ ass_free_track(ass->track);
+ if (ass->renderer)
+ ass_renderer_done(ass->renderer);
+ if (ass->library)
+ ass_library_done(ass->library);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ AssContext *ass = inlink->dst->priv;
+
+ ff_draw_init(&ass->draw, inlink->format, ass->alpha ?
FF_DRAW_PROCESS_ALPHA : 0);
+
+ ass_set_frame_size (ass->renderer, inlink->w, inlink->h);
+ if (ass->original_w && ass->original_h)
+ ass_set_aspect_ratio(ass->renderer, (double)inlink->w / inlink->h,
+ (double)ass->original_w / ass->original_h);
+ if (ass->shaping != -1)
+ ass_set_shaper(ass->renderer, ass->shaping);
+
+ return 0;
+}
+
+/* libass stores an RGBA color in the format RRGGBBTT, where TT is the
transparency level */
+#define AR(c) ( (c)>>24)
+#define AG(c) (((c)>>16)&0xFF)
+#define AB(c) (((c)>>8) &0xFF)
+#define AA(c) ((0xFF-(c)) &0xFF)
+
+static void overlay_ass_image(AssContext *ass, AVFrame *picref,
+ const ASS_Image *image)
+{
+ for (; image; image = image->next) {
+ uint8_t rgba_color[] = {AR(image->color), AG(image->color),
AB(image->color), AA(image->color)};
+ FFDrawColor color;
+ ff_draw_color(&ass->draw, &color, rgba_color);
+ ff_blend_mask(&ass->draw, &color,
+ picref->data, picref->linesize,
+ picref->width, picref->height,
+ image->bitmap, image->stride, image->w, image->h,
+ 3, 0, image->dst_x, image->dst_y);
+ }
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ AssContext *ass = ctx->priv;
+ int detect_change = 0;
+ double time_ms = picref->pts * av_q2d(inlink->time_base) * 1000;
+ ASS_Image *image = ass_render_frame(ass->renderer, ass->track,
+ time_ms, &detect_change);
+
+ if (detect_change)
+ av_log(ctx, AV_LOG_DEBUG, "Change happened at time ms:%f\n", time_ms);
+
+ overlay_ass_image(ass, picref, image);
+
+ return ff_filter_frame(outlink, picref);
+}
+
+static const AVFilterPad ass_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
+ .filter_frame = filter_frame,
+ .config_props = config_input,
+ },
+};
+
+static const AVFilterPad ass_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+};
+
+#if CONFIG_ASS_FILTER
+
+static const AVOption ass_options[] = {
+ COMMON_OPTIONS
+ {"shaping", "set shaping engine", OFFSET(shaping), AV_OPT_TYPE_INT, { .i64
= -1 }, -1, 1, FLAGS, "shaping_mode"},
+ {"auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = -1},
INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
+ {"simple", "simple shaping", 0, AV_OPT_TYPE_CONST, {.i64 =
ASS_SHAPING_SIMPLE}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
+ {"complex", "complex shaping", 0, AV_OPT_TYPE_CONST, {.i64 =
ASS_SHAPING_COMPLEX}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
+ {NULL},
+};
+
+AVFILTER_DEFINE_CLASS(ass);
+
+static av_cold int init_ass(AVFilterContext *ctx)
+{
+ AssContext *ass = ctx->priv;
+ int ret = init(ctx);
+
+ if (ret < 0)
+ return ret;
+
+ /* Initialize fonts */
+ ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
+
+ ass->track = ass_read_file(ass->library, ass->filename, NULL);
+ if (!ass->track) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Could not create a libass track when reading file '%s'\n",
+ ass->filename);
+ return AVERROR(EINVAL);
+ }
+ return 0;
+}
+
+const AVFilter ff_vf_ass = {
+ .name = "ass",
+ .description = NULL_IF_CONFIG_SMALL("Render ASS subtitles onto input
video using the libass library."),
+ .priv_size = sizeof(AssContext),
+ .init = init_ass,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ FILTER_INPUTS(ass_inputs),
+ FILTER_OUTPUTS(ass_outputs),
+ .priv_class = &ass_class,
+};
+#endif
+
+#if CONFIG_SUBTITLES_FILTER
+
+static const AVOption subtitles_options[] = {
+ COMMON_OPTIONS
+ {"charenc", "set input character encoding", OFFSET(charenc),
AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS},
+ {"stream_index", "set stream index", OFFSET(stream_index),
AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
+ {"si", "set stream index", OFFSET(stream_index),
AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
+ {"force_style", "force subtitle style", OFFSET(force_style),
AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS},
+ {NULL},
+};
+
+static const char * const font_mimetypes[] = {
+ "font/ttf",
+ "font/otf",
+ "font/sfnt",
+ "font/woff",
+ "font/woff2",
+ "application/font-sfnt",
+ "application/font-woff",
+ "application/x-font-ttf",
+ "application/x-truetype-font",
+ "application/vnd.ms-opentype",
+ NULL
+};
+
+static int attachment_is_font(AVStream * st)
+{
+ const AVDictionaryEntry *tag = NULL;
+ int n;
+
+ tag = av_dict_get(st->metadata, "mimetype", NULL, AV_DICT_MATCH_CASE);
+
+ if (tag) {
+ for (n = 0; font_mimetypes[n]; n++) {
+ if (av_strcasecmp(font_mimetypes[n], tag->value) == 0)
+ return 1;
+ }
+ }
+ return 0;
+}
+
+AVFILTER_DEFINE_CLASS(subtitles);
+
+static av_cold int init_subtitles(AVFilterContext *ctx)
+{
+ int j, ret, sid;
+ int k = 0;
+ AVDictionary *codec_opts = NULL;
+ AVFormatContext *fmt = NULL;
+ AVCodecContext *dec_ctx = NULL;
+ const AVCodec *dec;
+ const AVCodecDescriptor *dec_desc;
+ AVStream *st;
+ AVPacket pkt;
+ AssContext *ass = ctx->priv;
+
+ /* Init libass */
+ ret = init(ctx);
+ if (ret < 0)
+ return ret;
+ ass->track = ass_new_track(ass->library);
+ if (!ass->track) {
+ av_log(ctx, AV_LOG_ERROR, "Could not create a libass track\n");
+ return AVERROR(EINVAL);
+ }
+
+ /* Open subtitles file */
+ ret = avformat_open_input(&fmt, ass->filename, NULL, NULL);
+ if (ret < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Unable to open %s\n", ass->filename);
+ goto end;
+ }
+ ret = avformat_find_stream_info(fmt, NULL);
+ if (ret < 0)
+ goto end;
+
+ /* Locate subtitles stream */
+ if (ass->stream_index < 0)
+ ret = av_find_best_stream(fmt, AVMEDIA_TYPE_SUBTITLE, -1, -1, NULL, 0);
+ else {
+ ret = -1;
+ if (ass->stream_index < fmt->nb_streams) {
+ for (j = 0; j < fmt->nb_streams; j++) {
+ if (fmt->streams[j]->codecpar->codec_type ==
AVMEDIA_TYPE_SUBTITLE) {
+ if (ass->stream_index == k) {
+ ret = j;
+ break;
+ }
+ k++;
+ }
+ }
+ }
+ }
+
+ if (ret < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Unable to locate subtitle stream in %s\n",
+ ass->filename);
+ goto end;
+ }
+ sid = ret;
+ st = fmt->streams[sid];
+
+ /* Load attached fonts */
+ for (j = 0; j < fmt->nb_streams; j++) {
+ AVStream *st = fmt->streams[j];
+ if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT &&
+ attachment_is_font(st)) {
+ const AVDictionaryEntry *tag = NULL;
+ tag = av_dict_get(st->metadata, "filename", NULL,
+ AV_DICT_MATCH_CASE);
+
+ if (tag) {
+ av_log(ctx, AV_LOG_DEBUG, "Loading attached font: %s\n",
+ tag->value);
+ ass_add_font(ass->library, tag->value,
+ st->codecpar->extradata,
+ st->codecpar->extradata_size);
+ } else {
+ av_log(ctx, AV_LOG_WARNING,
+ "Font attachment has no filename, ignored.\n");
+ }
+ }
+ }
+
+ /* Initialize fonts */
+ ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
+
+ /* Open decoder */
+ dec = avcodec_find_decoder(st->codecpar->codec_id);
+ if (!dec) {
+ av_log(ctx, AV_LOG_ERROR, "Failed to find subtitle codec %s\n",
+ avcodec_get_name(st->codecpar->codec_id));
+ ret = AVERROR_DECODER_NOT_FOUND;
+ goto end;
+ }
+ dec_desc = avcodec_descriptor_get(st->codecpar->codec_id);
+ if (dec_desc && !(dec_desc->props & AV_CODEC_PROP_TEXT_SUB)) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Only text based subtitles are currently supported\n");
+ ret = AVERROR_PATCHWELCOME;
+ goto end;
+ }
+ if (ass->charenc)
+ av_dict_set(&codec_opts, "sub_charenc", ass->charenc, 0);
+
+ dec_ctx = avcodec_alloc_context3(dec);
+ if (!dec_ctx) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+
+ ret = avcodec_parameters_to_context(dec_ctx, st->codecpar);
+ if (ret < 0)
+ goto end;
+
+ /*
+ * This is required by the decoding process in order to rescale the
+ * timestamps: in the current API the decoded subtitles have their pts
+ * expressed in AV_TIME_BASE, and thus the lavc internals need to know the
+ * stream time base in order to achieve the rescaling.
+ *
+ * That API is old and needs to be reworked to match behaviour with A/V.
+ */
+ dec_ctx->pkt_timebase = st->time_base;
+
+ ret = avcodec_open2(dec_ctx, NULL, &codec_opts);
+ if (ret < 0)
+ goto end;
+
+ if (ass->force_style) {
+ char **list = NULL;
+ char *temp = NULL;
+ char *ptr = av_strtok(ass->force_style, ",", &temp);
+ int i = 0;
+ while (ptr) {
+ av_dynarray_add(&list, &i, ptr);
+ if (!list) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+ ptr = av_strtok(NULL, ",", &temp);
+ }
+ av_dynarray_add(&list, &i, NULL);
+ if (!list) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+ ass_set_style_overrides(ass->library, list);
+ av_free(list);
+ }
+ /* Decode subtitles and push them into the renderer (libass) */
+ if (dec_ctx->subtitle_header)
+ ass_process_codec_private(ass->track,
+ dec_ctx->subtitle_header,
+ dec_ctx->subtitle_header_size);
+ while (av_read_frame(fmt, &pkt) >= 0) {
+ int i, got_subtitle;
+ AVSubtitle sub = {0};
+
+ if (pkt.stream_index == sid) {
+ ret = avcodec_decode_subtitle2(dec_ctx, &sub, &got_subtitle, &pkt);
+ if (ret < 0) {
+ av_log(ctx, AV_LOG_WARNING, "Error decoding: %s (ignored)\n",
+ av_err2str(ret));
+ } else if (got_subtitle) {
+ const int64_t start_time = av_rescale_q(sub.pts,
AV_TIME_BASE_Q, av_make_q(1, 1000));
+ const int64_t duration = sub.end_display_time;
+ for (i = 0; i < sub.num_rects; i++) {
+ char *ass_line = sub.rects[i]->ass;
+ if (!ass_line)
+ break;
+ ass_process_chunk(ass->track, ass_line, strlen(ass_line),
+ start_time, duration);
+ }
+ }
+ }
+ av_packet_unref(&pkt);
+ avsubtitle_free(&sub);
+ }
+
+end:
+ av_dict_free(&codec_opts);
+ avcodec_free_context(&dec_ctx);
+ avformat_close_input(&fmt);
+ return ret;
+}
+
+const AVFilter ff_vf_subtitles = {
+ .name = "subtitles",
+ .description = NULL_IF_CONFIG_SMALL("Render text subtitles onto input
video using the libass library."),
+ .priv_size = sizeof(AssContext),
+ .init = init_subtitles,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ FILTER_INPUTS(ass_inputs),
+ FILTER_OUTPUTS(ass_outputs),
+ .priv_class = &subtitles_class,
+};
+#endif
--
2.30.2.windows.1
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