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/*
* 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 *ass_style_get(ASSSplitContext *ctx, const char *style);
#endif /* AVCODEC_ASS_SPLIT_H */
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