gstreamer/subprojects/gst-plugins-bad/sys/dwrite/libcaption/caption.h
2023-06-27 13:23:07 +00:00

136 lines
5.7 KiB
C

/**********************************************************************************************/
/* The MIT License */
/* */
/* Copyright 2016-2017 Twitch Interactive, Inc. or its affiliates. All Rights Reserved. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining a copy */
/* of this software and associated documentation files (the "Software"), to deal */
/* in the Software without restriction, including without limitation the rights */
/* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell */
/* copies of the Software, and to permit persons to whom the Software is */
/* furnished to do so, subject to the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be included in */
/* all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR */
/* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, */
/* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE */
/* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER */
/* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, */
/* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN */
/* THE SOFTWARE. */
/**********************************************************************************************/
#ifndef LIBCAPTION_H
#define LIBCAPTION_H
#ifdef __cplusplus
extern "C" {
#endif
#include "eia608.h"
#include "utf8.h"
#include "xds.h"
typedef enum {
LIBCAPTION_ERROR = 0,
LIBCAPTION_OK = 1,
LIBCAPTION_READY = 2,
LIBCAPTION_CLEAR = 3,
} libcaption_stauts_t;
static inline libcaption_stauts_t libcaption_status_update(libcaption_stauts_t old_stat, libcaption_stauts_t new_stat)
{
return (LIBCAPTION_ERROR == old_stat || LIBCAPTION_ERROR == new_stat) ? LIBCAPTION_ERROR : (LIBCAPTION_READY == old_stat) ? LIBCAPTION_READY : new_stat;
}
#define SCREEN_ROWS 15
#define SCREEN_COLS 32
typedef struct {
uint8_t uln; //< underline
uint8_t sty; //< style
utf8_char_t data[5]; //< 4 byte utf8 values plus null term
} caption_frame_cell_t;
typedef struct {
caption_frame_cell_t cell[SCREEN_ROWS][SCREEN_COLS];
} caption_frame_buffer_t;
typedef struct {
uint8_t uln; //< underline
uint8_t sty; //< style
uint8_t rup; //< roll-up line count minus 1
int8_t row, col;
uint16_t cc_data;
} caption_frame_state_t;
// timestamp and duration are in seconds
typedef struct {
double timestamp;
xds_t xds;
caption_frame_state_t state;
caption_frame_buffer_t front;
caption_frame_buffer_t back;
caption_frame_buffer_t* write;
libcaption_stauts_t status;
} caption_frame_t;
/*!
\brief Initializes an allocated caption_frame_t instance
\param frame Pointer to prealocated caption_frame_t object
*/
void caption_frame_init(caption_frame_t* frame);
/*! \brief
\param
*/
static inline int caption_frame_popon(caption_frame_t* frame) { return (frame->write == &frame->back) ? 1 : 0; }
/*! \brief
\param
*/
static inline int caption_frame_painton(caption_frame_t* frame) { return (frame->write == &frame->front) ? 1 : 0; }
/*! \brief
\param
*/
const static int _caption_frame_rollup[] = { 0, 2, 3, 4 };
static inline int caption_frame_rollup(caption_frame_t* frame) { return _caption_frame_rollup[frame->state.rup]; }
/*! \brief
\param
*/
static inline double caption_frame_timestamp(caption_frame_t* frame) { return frame->timestamp; }
/*! \brief Writes a single charcter to a caption_frame_t object
\param frame A pointer to an allocted and initialized caption_frame_t object
\param row Row position to write charcter, must be between 0 and SCREEN_ROWS-1
\param col Column position to write charcter, must be between 0 and SCREEN_ROWS-1
\param style Style to apply to charcter
\param underline Set underline attribute, 0 = off any other value = on
\param c pointer to a single valid utf8 charcter. Bytes are automatically determined, and a NULL terminator is not required
*/
int caption_frame_write_char(caption_frame_t* frame, int row, int col, eia608_style_t style, int underline, const utf8_char_t* c);
/*! \brief
\param
*/
const utf8_char_t* caption_frame_read_char(caption_frame_t* frame, int row, int col, eia608_style_t* style, int* underline);
/*! \brief
\param
*/
libcaption_stauts_t caption_frame_decode(caption_frame_t* frame, uint16_t cc_data, double timestamp);
/*! \brief
\param
*/
int caption_frame_from_text(caption_frame_t* frame, const utf8_char_t* data);
/*! \brief
\param
*/
#define CAPTION_FRAME_TEXT_BYTES (4 * ((SCREEN_COLS + 2) * SCREEN_ROWS) + 1)
size_t caption_frame_to_text(caption_frame_t* frame, utf8_char_t* data, int full);
/*! \brief
\param
*/
#define CAPTION_FRAME_DUMP_BUF_SIZE 8192
size_t caption_frame_dump_buffer(caption_frame_t* frame, utf8_char_t* buf);
void caption_frame_dump(caption_frame_t* frame);
#ifdef __cplusplus
}
#endif
#endif