/* * SSA/ASS spliting functions * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> * * 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 AVCODEC_ASS_SPLIT_H #define AVCODEC_ASS_SPLIT_H /** * fields extracted from the [Script Info] section */ typedef struct { char *script_type; /**< SSA script format version (eg. v4.00) */ char *collisions; /**< how subtitles are moved to prevent collisions */ int play_res_x; /**< video width that ASS coords are referring to */ int play_res_y; /**< video height that ASS coords are referring to */ float timer; /**< time multiplier to apply to SSA clock (in %) */ } ASSScriptInfo; /** * fields extracted from the [V4(+) Styles] section */ typedef struct { char *name; /**< name of the tyle (case sensitive) */ char *font_name; /**< font face (case sensitive) */ int font_size; /**< font height */ int primary_color; /**< color that a subtitle will normally appear in */ int back_color; /**< color of the subtitle outline or shadow */ int bold; /**< whether text is bold (1) or not (0) */ int italic; /**< whether text is italic (1) or not (0) */ int underline; /**< whether text is underlined (1) or not (0) */ int alignment; /**< position of the text (left, center, top...), defined after the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top) */ } ASSStyle; /** * fields extracted from the [Events] section */ typedef struct { int layer; /**< higher numbered layers are drawn over lower numbered */ int start; /**< start time of the dialog in centiseconds */ int end; /**< end time of the dialog in centiseconds */ char *style; /**< name of the ASSStyle to use with this dialog */ char *text; /**< actual text which will be displayed as a subtitle, can include style override control codes (see ff_ass_split_override_codes()) */ } ASSDialog; /** * structure containing the whole split ASS data */ typedef struct { ASSScriptInfo script_info; /**< general information about the SSA script*/ ASSStyle *styles; /**< array of split out styles */ int styles_count; /**< number of ASSStyle in the styles array */ ASSDialog *dialogs; /**< array of split out dialogs */ int dialogs_count; /**< number of ASSDialog in the dialogs array*/ } ASS; /** * This struct can be casted to ASS to access to the split data. */ typedef struct ASSSplitContext ASSSplitContext; /** * Split a full ASS file or a ASS header from a string buffer and store * the split structure in a newly allocated context. * * @param buf String containing the ASS formated data. * @return Newly allocated struct containing split data. */ ASSSplitContext *ff_ass_split(const char *buf); /** * Split one or several ASS "Dialogue" lines from a string buffer and store * them in a already initialized context. * * @param ctx Context previously initialized by ff_ass_split(). * @param buf String containing the ASS "Dialogue" lines. * @param cache Set to 1 to keep all the previously split ASSDialog in * the context, or set to 0 to free all the previously split * ASSDialog. * @param number If not NULL, the pointed integer will be set to the number * of split ASSDialog. * @return Pointer to the first split ASSDialog. */ ASSDialog *ff_ass_split_dialog(ASSSplitContext *ctx, const char *buf, int cache, int *number); /** * Free all the memory allocated for an ASSSplitContext. * * @param ctx Context previously initialized by ff_ass_split(). */ void ff_ass_split_free(ASSSplitContext *ctx); /** * Set of callback functions corresponding to each override codes that can * be encountered in a "Dialogue" Text field. */ typedef struct { /** * @defgroup ass_styles ASS styles * @{ */ void (*text)(void *priv, const char *text, int len); void (*new_line)(void *priv, int forced); void (*style)(void *priv, char style, int close); void (*color)(void *priv, unsigned int /* color */, unsigned int color_id); void (*alpha)(void *priv, int alpha, int alpha_id); void (*font_name)(void *priv, const char *name); void (*font_size)(void *priv, int size); void (*alignment)(void *priv, int alignment); void (*cancel_overrides)(void *priv, const char *style); /** @} */ /** * @defgroup ass_functions ASS functions * @{ */ void (*move)(void *priv, int x1, int y1, int x2, int y2, int t1, int t2); void (*origin)(void *priv, int x, int y); /** @} */ /** * @defgroup ass_end end of Dialogue Event * @{ */ void (*end)(void *priv); /** @} */ } ASSCodesCallbacks; /** * Split override codes out of a ASS "Dialogue" Text field. * * @param callbacks Set of callback functions called for each override code * encountered. * @param priv Opaque pointer passed to the callback functions. * @param buf The ASS "Dialogue" Text field to split. * @return >= 0 on success otherwise an error code <0 */ int ff_ass_split_override_codes(const ASSCodesCallbacks *callbacks, void *priv, const char *buf); /** * Find an ASSStyle structure by its name. * * @param ctx Context previously initialized by ff_ass_split(). * @param style name of the style to search for. * @return the ASSStyle corresponding to style, or NULL if style can't be found */ ASSStyle *ff_ass_style_get(ASSSplitContext *ctx, const char *style); #endif /* AVCODEC_ASS_SPLIT_H */