0,0 → 1,471 |
/* |
* 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 { |
const AVClass *class; |
ASS_Library *library; |
ASS_Renderer *renderer; |
ASS_Track *track; |
char *filename; |
char *fontsdir; |
char *charenc; |
char *force_style; |
int stream_index; |
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}, CHAR_MIN, CHAR_MAX, FLAGS }, \ |
{"f", "set the filename of file to read", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, \ |
{"original_size", "set the size of the original video (used to scale fonts)", OFFSET(original_w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, \ |
{"fontsdir", "set the directory containing the fonts to read", OFFSET(fontsdir), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, 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->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, 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, |
.filter_frame = filter_frame, |
.config_props = config_input, |
.needs_writable = 1, |
}, |
{ NULL } |
}; |
|
static const AVFilterPad ass_outputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
}, |
{ NULL } |
}; |
|
#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; |
} |
|
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, |
.inputs = ass_inputs, |
.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}, CHAR_MIN, CHAR_MAX, 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}, CHAR_MIN, CHAR_MAX, 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; |
AVCodec *dec = NULL; |
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]->codec->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->codec->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->codec->extradata, |
st->codec->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_ctx = st->codec; |
dec = avcodec_find_decoder(dec_ctx->codec_id); |
if (!dec) { |
av_log(ctx, AV_LOG_ERROR, "Failed to find subtitle codec %s\n", |
avcodec_get_name(dec_ctx->codec_id)); |
return AVERROR(EINVAL); |
} |
dec_desc = avcodec_descriptor_get(dec_ctx->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"); |
return AVERROR_PATCHWELCOME; |
} |
if (ass->charenc) |
av_dict_set(&codec_opts, "sub_charenc", ass->charenc, 0); |
ret = avcodec_open2(dec_ctx, dec, &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); |
av_init_packet(&pkt); |
pkt.data = NULL; |
pkt.size = 0; |
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) { |
for (i = 0; i < sub.num_rects; i++) { |
char *ass_line = sub.rects[i]->ass; |
if (!ass_line) |
break; |
ass_process_data(ass->track, ass_line, strlen(ass_line)); |
} |
} |
} |
av_free_packet(&pkt); |
avsubtitle_free(&sub); |
} |
|
end: |
av_dict_free(&codec_opts); |
if (dec_ctx) |
avcodec_close(dec_ctx); |
if (fmt) |
avformat_close_input(&fmt); |
return ret; |
} |
|
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, |
.inputs = ass_inputs, |
.outputs = ass_outputs, |
.priv_class = &subtitles_class, |
}; |
#endif |