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/*

 * 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 

#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,   /*  */

    [4] = AV_LOG_INFO,      /* MSGL_INFO */

    [5] = AV_LOG_INFO,      /*  */

    [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