173 lines
6.4 KiB
C
173 lines
6.4 KiB
C
/*
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* SSA/ASS spliting functions
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* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_ASS_SPLIT_H
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#define AVCODEC_ASS_SPLIT_H
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/**
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* fields extracted from the [Script Info] section
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*/
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typedef struct {
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char *script_type; /**< SSA script format version (eg. v4.00) */
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char *collisions; /**< how subtitles are moved to prevent collisions */
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int play_res_x; /**< video width that ASS coords are referring to */
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int play_res_y; /**< video height that ASS coords are referring to */
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float timer; /**< time multiplier to apply to SSA clock (in %) */
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} ASSScriptInfo;
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/**
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* fields extracted from the [V4(+) Styles] section
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*/
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typedef struct {
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char *name; /**< name of the tyle (case sensitive) */
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char *font_name; /**< font face (case sensitive) */
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int font_size; /**< font height */
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int primary_color; /**< color that a subtitle will normally appear in */
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int back_color; /**< color of the subtitle outline or shadow */
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int bold; /**< whether text is bold (1) or not (0) */
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int italic; /**< whether text is italic (1) or not (0) */
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int underline; /**< whether text is underlined (1) or not (0) */
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int alignment; /**< position of the text (left, center, top...),
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defined after the layout of the numpad
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(1-3 sub, 4-6 mid, 7-9 top) */
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} ASSStyle;
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/**
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* fields extracted from the [Events] section
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*/
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typedef struct {
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int layer; /**< higher numbered layers are drawn over lower numbered */
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int start; /**< start time of the dialog in centiseconds */
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int end; /**< end time of the dialog in centiseconds */
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char *style; /**< name of the ASSStyle to use with this dialog */
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char *text; /**< actual text which will be displayed as a subtitle,
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can include style override control codes (see
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ff_ass_split_override_codes()) */
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} ASSDialog;
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/**
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* structure containing the whole split ASS data
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*/
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typedef struct {
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ASSScriptInfo script_info; /**< general information about the SSA script*/
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ASSStyle *styles; /**< array of split out styles */
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int styles_count; /**< number of ASSStyle in the styles array */
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ASSDialog *dialogs; /**< array of split out dialogs */
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int dialogs_count; /**< number of ASSDialog in the dialogs array*/
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} ASS;
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/**
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* This struct can be casted to ASS to access to the split data.
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*/
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typedef struct ASSSplitContext ASSSplitContext;
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/**
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* Split a full ASS file or a ASS header from a string buffer and store
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* the split structure in a newly allocated context.
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*
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* @param buf String containing the ASS formated data.
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* @return Newly allocated struct containing split data.
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*/
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ASSSplitContext *ff_ass_split(const char *buf);
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/**
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* Split one or several ASS "Dialogue" lines from a string buffer and store
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* them in a already initialized context.
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*
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* @param ctx Context previously initialized by ff_ass_split().
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* @param buf String containing the ASS "Dialogue" lines.
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* @param cache Set to 1 to keep all the previously split ASSDialog in
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* the context, or set to 0 to free all the previously split
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* ASSDialog.
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* @param number If not NULL, the pointed integer will be set to the number
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* of split ASSDialog.
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* @return Pointer to the first split ASSDialog.
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*/
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ASSDialog *ff_ass_split_dialog(ASSSplitContext *ctx, const char *buf,
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int cache, int *number);
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/**
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* Free all the memory allocated for an ASSSplitContext.
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*
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* @param ctx Context previously initialized by ff_ass_split().
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*/
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void ff_ass_split_free(ASSSplitContext *ctx);
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/**
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* Set of callback functions corresponding to each override codes that can
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* be encountered in a "Dialogue" Text field.
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*/
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typedef struct {
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/**
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* @defgroup ass_styles ASS styles
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* @{
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*/
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void (*text)(void *priv, const char *text, int len);
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void (*new_line)(void *priv, int forced);
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void (*style)(void *priv, char style, int close);
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void (*color)(void *priv, unsigned int color, unsigned int color_id);
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void (*alpha)(void *priv, int alpha, int alpha_id);
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void (*font_name)(void *priv, const char *name);
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void (*font_size)(void *priv, int size);
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void (*alignment)(void *priv, int alignment);
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void (*cancel_overrides)(void *priv, const char *style);
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/**< @} */
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/**
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* @defgroup ass_functions ASS functions
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* @{
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*/
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void (*move)(void *priv, int x1, int y1, int x2, int y2, int t1, int t2);
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void (*origin)(void *priv, int x, int y);
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/**< @} */
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/**
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* @defgroup ass_end end of Dialogue Event
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* @{
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*/
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void (*end)(void *priv);
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/**< @} */
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} ASSCodesCallbacks;
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/**
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* Split override codes out of a ASS "Dialogue" Text field.
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*
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* @param callbacks Set of callback functions called for each override code
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* encountered.
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* @param priv Opaque pointer passed to the callback functions.
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* @param buf The ASS "Dialogue" Text field to split.
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* @return >= 0 on success otherwise an error code <0
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*/
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int ff_ass_split_override_codes(const ASSCodesCallbacks *callbacks, void *priv,
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const char *buf);
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/**
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* Find an ASSStyle structure by its name.
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*
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* @param ctx Context previously initialized by ff_ass_split().
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* @param style name of the style to search for.
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* @return the ASSStyle corresponding to style, or NULL if style can't be found
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*/
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ASSStyle *ass_style_get(ASSSplitContext *ctx, const char *style);
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#endif /* AVCODEC_ASS_SPLIT_H */
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