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// -*- c-basic-offset: 8; indent-tabs-mode: t -*-
// vim:ts=8:sw=8:noet:ai:
/*
Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __ASS_H__
#define __ASS_H__
#include "ass_types.h"
/// Libass renderer object. Contents are private.
typedef struct ass_renderer_s ass_renderer_t;
/// a linked list of images produced by ass renderer
typedef struct ass_image_s {
int w, h; // bitmap width/height
int stride; // bitmap stride
unsigned char* bitmap; // 1bpp stride*h alpha buffer
uint32_t color; // RGBA
int dst_x, dst_y; // bitmap placement inside the video frame
struct ass_image_s* next; // linked list
} ass_image_t;
/**
* \brief initialize the library
* \return library handle or NULL if failed
*/
ass_library_t* ass_library_init(void);
/**
* \brief finalize the library
* \param priv library handle
*/
void ass_library_done(ass_library_t*);
/**
* \brief set private font directory
* It is used for saving embedded fonts and also in font lookup.
*/
void ass_set_fonts_dir(ass_library_t* priv, const char* fonts_dir);
void ass_set_extract_fonts(ass_library_t* priv, int extract);
void ass_set_style_overrides(ass_library_t* priv, char** list);
/**
* \brief initialize the renderer
* \param priv library handle
* \return renderer handle or NULL if failed
*/
ass_renderer_t* ass_renderer_init(ass_library_t*);
/**
* \brief finalize the renderer
* \param priv renderer handle
*/
void ass_renderer_done(ass_renderer_t* priv);
void ass_set_frame_size(ass_renderer_t* priv, int w, int h);
void ass_set_margins(ass_renderer_t* priv, int t, int b, int l, int r);
void ass_set_use_margins(ass_renderer_t* priv, int use);
void ass_set_aspect_ratio(ass_renderer_t* priv, double ar);
void ass_set_font_scale(ass_renderer_t* priv, double font_scale);
/**
* \brief set font lookup defaults
*/
int ass_set_fonts(ass_renderer_t* priv, const char* default_font, const char* default_family);
/**
* \brief render a frame, producing a list of ass_image_t
* \param priv library
* \param track subtitle track
* \param now video timestamp in milliseconds
*/
ass_image_t* ass_render_frame(ass_renderer_t *priv, ass_track_t* track, long long now, int* detect_change);
// The following functions operate on track objects and do not need an ass_renderer //
/**
* \brief allocate a new empty track object
* \return pointer to empty track
*/
ass_track_t* ass_new_track(ass_library_t*);
/**
* \brief deallocate track and all its child objects (styles and events)
* \param track track to deallocate
*/
void ass_free_track(ass_track_t* track);
/**
* \brief allocate new style
* \param track track
* \return newly allocated style id
*/
int ass_alloc_style(ass_track_t* track);
/**
* \brief allocate new event
* \param track track
* \return newly allocated event id
*/
int ass_alloc_event(ass_track_t* track);
/**
* \brief delete a style
* \param track track
* \param sid style id
* Deallocates style data. Does not modify track->n_styles.
*/
void ass_free_style(ass_track_t* track, int sid);
/**
* \brief delete an event
* \param track track
* \param eid event id
* Deallocates event data. Does not modify track->n_events.
*/
void ass_free_event(ass_track_t* track, int eid);
/**
* \brief Process Codec Private section of subtitle stream
* \param track target track
* \param data string to parse
* \param size length of data
*/
void ass_process_codec_private(ass_track_t* track, char *data, int size);
/**
* \brief Process a chunk of subtitle stream data. In matroska, this containes exactly 1 event (or a commentary)
* \param track track
* \param data string to parse
* \param size length of data
* \param timecode starting time of the event (milliseconds)
* \param duration duration of the event (milliseconds)
*/
void ass_process_chunk(ass_track_t* track, char *data, int size, long long timecode, long long duration);
/**
* \brief Read subtitles from file.
* \param fname file name
* \return newly allocated track
*/
ass_track_t* ass_read_file(ass_library_t* library, char* fname, char* codepage);
/**
* \brief Read subtitles from memory.
* \param library libass library object
* \param buf pointer to subtitles text
* \param bufsize size of buffer
* \param codepage recode buffer contents from given codepage
* \return newly allocated track
*/
ass_track_t* ass_read_memory(ass_library_t* library, char* buf, size_t bufsize, char* codepage);
/**
* \brief read styles from file into already initialized track
* \return 0 on success
*/
int ass_read_styles(ass_track_t* track, char* fname, char* codepage);
/**
* \brief Add a memory font.
* \param name attachment name
* \param data binary font data
* \param data_size data size
*/
void ass_add_font(ass_library_t* library, char* name, char* data, int data_size);
/**
* \brief Calculates timeshift from now to the start of some other subtitle event, depending on movement parameter
* \param track subtitle track
* \param now current time, ms
* \param movement how many events to skip from the one currently displayed
* +2 means "the one after the next", -1 means "previous"
* \return timeshift, ms
*/
long long ass_step_sub(ass_track_t* track, long long now, int movement);
#endif
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