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Aegisub/aegisub/libass/ass.c

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/*
* Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
*
* This file is part of libass.
*
* libass 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.
*
* libass 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 libass; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <inttypes.h>
#ifdef CONFIG_ICONV
#include <iconv.h>
#endif
#include "ass.h"
#include "ass_utils.h"
#include "ass_library.h"
typedef enum {
PST_UNKNOWN = 0,
PST_INFO,
PST_STYLES,
PST_EVENTS,
PST_FONTS
} ParserState;
struct parser_priv {
ParserState state;
char *fontname;
char *fontdata;
int fontdata_size;
int fontdata_used;
};
#define ASS_STYLES_ALLOC 20
#define ASS_EVENTS_ALLOC 200
void ass_free_track(ASS_Track *track)
{
int i;
if (track->parser_priv) {
if (track->parser_priv->fontname)
free(track->parser_priv->fontname);
if (track->parser_priv->fontdata)
free(track->parser_priv->fontdata);
free(track->parser_priv);
}
if (track->style_format)
free(track->style_format);
if (track->event_format)
free(track->event_format);
if (track->styles) {
for (i = 0; i < track->n_styles; ++i)
ass_free_style(track, i);
free(track->styles);
}
if (track->events) {
for (i = 0; i < track->n_events; ++i)
ass_free_event(track, i);
free(track->events);
}
free(track->name);
free(track);
}
/// \brief Allocate a new style struct
/// \param track track
/// \return style id
int ass_alloc_style(ASS_Track *track)
{
int sid;
assert(track->n_styles <= track->max_styles);
if (track->n_styles == track->max_styles) {
track->max_styles += ASS_STYLES_ALLOC;
track->styles =
(ASS_Style *) realloc(track->styles,
sizeof(ASS_Style) *
track->max_styles);
}
sid = track->n_styles++;
memset(track->styles + sid, 0, sizeof(ASS_Style));
return sid;
}
/// \brief Allocate a new event struct
/// \param track track
/// \return event id
int ass_alloc_event(ASS_Track *track)
{
int eid;
assert(track->n_events <= track->max_events);
if (track->n_events == track->max_events) {
track->max_events += ASS_EVENTS_ALLOC;
track->events =
(ASS_Event *) realloc(track->events,
sizeof(ASS_Event) *
track->max_events);
}
eid = track->n_events++;
memset(track->events + eid, 0, sizeof(ASS_Event));
return eid;
}
void ass_free_event(ASS_Track *track, int eid)
{
ASS_Event *event = track->events + eid;
if (event->Name)
free(event->Name);
if (event->Effect)
free(event->Effect);
if (event->Text)
free(event->Text);
if (event->render_priv)
free(event->render_priv);
}
void ass_free_style(ASS_Track *track, int sid)
{
ASS_Style *style = track->styles + sid;
if (style->Name)
free(style->Name);
if (style->FontName)
free(style->FontName);
}
// ==============================================================================================
static void skip_spaces(char **str)
{
char *p = *str;
while ((*p == ' ') || (*p == '\t'))
++p;
*str = p;
}
static void rskip_spaces(char **str, char *limit)
{
char *p = *str;
while ((p >= limit) && ((*p == ' ') || (*p == '\t')))
--p;
*str = p;
}
/**
* \brief find style by name
* \param track track
* \param name style name
* \return index in track->styles
* Returnes 0 if no styles found => expects at least 1 style.
* Parsing code always adds "Default" style in the end.
*/
static int lookup_style(ASS_Track *track, char *name)
{
int i;
if (*name == '*')
++name; // FIXME: what does '*' really mean ?
for (i = track->n_styles - 1; i >= 0; --i) {
// FIXME: mb strcasecmp ?
if (strcmp(track->styles[i].Name, name) == 0)
return i;
}
i = track->default_style;
ass_msg(track->library, MSGL_WARN,
"[%p]: Warning: no style named '%s' found, using '%s'",
track, name, track->styles[i].Name);
return i; // use the first style
}
static uint32_t string2color(ASS_Library *library, char *p)
{
uint32_t tmp;
(void) strtocolor(library, &p, &tmp, 0);
return tmp;
}
static long long string2timecode(ASS_Library *library, char *p)
{
unsigned h, m, s, ms;
long long tm;
int res = sscanf(p, "%1d:%2d:%2d.%2d", &h, &m, &s, &ms);
if (res < 4) {
ass_msg(library, MSGL_WARN, "Bad timestamp");
return 0;
}
tm = ((h * 60 + m) * 60 + s) * 1000 + ms * 10;
return tm;
}
/**
* \brief converts numpad-style align to align.
*/
static int numpad2align(int val)
{
int res, v;
v = (val - 1) / 3; // 0, 1 or 2 for vertical alignment
if (v != 0)
v = 3 - v;
res = ((val - 1) % 3) + 1; // horizontal alignment
res += v * 4;
return res;
}
#define NEXT(str,token) \
token = next_token(&str); \
if (!token) break;
#define ANYVAL(name,func) \
} else if (strcasecmp(tname, #name) == 0) { \
target->name = func(token); \
ass_msg(track->library, MSGL_DBG2, "%s = %s", #name, token);
#define STRVAL(name) \
} else if (strcasecmp(tname, #name) == 0) { \
if (target->name != NULL) free(target->name); \
target->name = strdup(token); \
ass_msg(track->library, MSGL_DBG2, "%s = %s", #name, token);
#define COLORVAL(name) \
} else if (strcasecmp(tname, #name) == 0) { \
target->name = string2color(track->library, token); \
ass_msg(track->library, MSGL_DBG2, "%s = %s", #name, token);
#define INTVAL(name) ANYVAL(name,atoi)
#define FPVAL(name) ANYVAL(name,atof)
#define TIMEVAL(name) \
} else if (strcasecmp(tname, #name) == 0) { \
target->name = string2timecode(track->library, token); \
ass_msg(track->library, MSGL_DBG2, "%s = %s", #name, token);
#define STYLEVAL(name) \
} else if (strcasecmp(tname, #name) == 0) { \
target->name = lookup_style(track, token); \
ass_msg(track->library, MSGL_DBG2, "%s = %s", #name, token);
#define ALIAS(alias,name) \
if (strcasecmp(tname, #alias) == 0) {tname = #name;}
static char *next_token(char **str)
{
char *p = *str;
char *start;
skip_spaces(&p);
if (*p == '\0') {
*str = p;
return 0;
}
start = p; // start of the token
for (; (*p != '\0') && (*p != ','); ++p) {
}
if (*p == '\0') {
*str = p; // eos found, str will point to '\0' at exit
} else {
*p = '\0';
*str = p + 1; // ',' found, str will point to the next char (beginning of the next token)
}
--p; // end of current token
rskip_spaces(&p, start);
if (p < start)
p = start; // empty token
else
++p; // the first space character, or '\0'
*p = '\0';
return start;
}
/**
* \brief Parse the tail of Dialogue line
* \param track track
* \param event parsed data goes here
* \param str string to parse, zero-terminated
* \param n_ignored number of format options to skip at the beginning
*/
static int process_event_tail(ASS_Track *track, ASS_Event *event,
char *str, int n_ignored)
{
char *token;
char *tname;
char *p = str;
int i;
ASS_Event *target = event;
char *format = strdup(track->event_format);
char *q = format; // format scanning pointer
if (track->n_styles == 0) {
// add "Default" style to the end
// will be used if track does not contain a default style (or even does not contain styles at all)
int sid = ass_alloc_style(track);
track->styles[sid].Name = strdup("Default");
track->styles[sid].FontName = strdup("Arial");
}
for (i = 0; i < n_ignored; ++i) {
NEXT(q, tname);
}
while (1) {
NEXT(q, tname);
if (strcasecmp(tname, "Text") == 0) {
char *last;
event->Text = strdup(p);
if (*event->Text != 0) {
last = event->Text + strlen(event->Text) - 1;
if (last >= event->Text && *last == '\r')
*last = 0;
}
ass_msg(track->library, MSGL_DBG2, "Text = %s", event->Text);
event->Duration -= event->Start;
free(format);
return 0; // "Text" is always the last
}
NEXT(p, token);
ALIAS(End, Duration) // temporarily store end timecode in event->Duration
if (0) { // cool ;)
INTVAL(Layer)
STYLEVAL(Style)
STRVAL(Name)
STRVAL(Effect)
INTVAL(MarginL)
INTVAL(MarginR)
INTVAL(MarginV)
TIMEVAL(Start)
TIMEVAL(Duration)
}
}
free(format);
return 1;
}
/**
* \brief Parse command line style overrides (--ass-force-style option)
* \param track track to apply overrides to
* The format for overrides is [StyleName.]Field=Value
*/
void ass_process_force_style(ASS_Track *track)
{
char **fs, *eq, *dt, *style, *tname, *token;
ASS_Style *target;
int sid;
char **list = track->library->style_overrides;
if (!list)
return;
for (fs = list; *fs; ++fs) {
eq = strrchr(*fs, '=');
if (!eq)
continue;
*eq = '\0';
token = eq + 1;
if (!strcasecmp(*fs, "PlayResX"))
track->PlayResX = atoi(token);
else if (!strcasecmp(*fs, "PlayResY"))
track->PlayResY = atoi(token);
else if (!strcasecmp(*fs, "Timer"))
track->Timer = atof(token);
else if (!strcasecmp(*fs, "WrapStyle"))
track->WrapStyle = atoi(token);
else if (!strcasecmp(*fs, "ScaledBorderAndShadow"))
track->ScaledBorderAndShadow = parse_bool(token);
else if (!strcasecmp(*fs, "Kerning"))
track->Kerning = parse_bool(token);
dt = strrchr(*fs, '.');
if (dt) {
*dt = '\0';
style = *fs;
tname = dt + 1;
} else {
style = NULL;
tname = *fs;
}
for (sid = 0; sid < track->n_styles; ++sid) {
if (style == NULL
|| strcasecmp(track->styles[sid].Name, style) == 0) {
target = track->styles + sid;
if (0) {
STRVAL(FontName)
COLORVAL(PrimaryColour)
COLORVAL(SecondaryColour)
COLORVAL(OutlineColour)
COLORVAL(BackColour)
FPVAL(FontSize)
INTVAL(Bold)
INTVAL(Italic)
INTVAL(Underline)
INTVAL(StrikeOut)
FPVAL(Spacing)
INTVAL(Angle)
INTVAL(BorderStyle)
INTVAL(Alignment)
INTVAL(MarginL)
INTVAL(MarginR)
INTVAL(MarginV)
INTVAL(Encoding)
FPVAL(ScaleX)
FPVAL(ScaleY)
FPVAL(Outline)
FPVAL(Shadow)
}
}
}
*eq = '=';
if (dt)
*dt = '.';
}
}
/**
* \brief Parse the Style line
* \param track track
* \param str string to parse, zero-terminated
* Allocates a new style struct.
*/
static int process_style(ASS_Track *track, char *str)
{
char *token;
char *tname;
char *p = str;
char *format;
char *q; // format scanning pointer
int sid;
ASS_Style *style;
ASS_Style *target;
if (!track->style_format) {
// no style format header
// probably an ancient script version
if (track->track_type == TRACK_TYPE_SSA)
track->style_format =
strdup
("Name, Fontname, Fontsize, PrimaryColour, SecondaryColour,"
"TertiaryColour, BackColour, Bold, Italic, BorderStyle, Outline,"
"Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding");
else
track->style_format =
strdup
("Name, Fontname, Fontsize, PrimaryColour, SecondaryColour,"
"OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut,"
"ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow,"
"Alignment, MarginL, MarginR, MarginV, Encoding");
}
q = format = strdup(track->style_format);
ass_msg(track->library, MSGL_V, "[%p] Style: %s", track, str);
sid = ass_alloc_style(track);
style = track->styles + sid;
target = style;
// fill style with some default values
style->ScaleX = 100.;
style->ScaleY = 100.;
while (1) {
NEXT(q, tname);
NEXT(p, token);
if (0) { // cool ;)
STRVAL(Name)
if ((strcmp(target->Name, "Default") == 0)
|| (strcmp(target->Name, "*Default") == 0))
track->default_style = sid;
STRVAL(FontName)
COLORVAL(PrimaryColour)
COLORVAL(SecondaryColour)
COLORVAL(OutlineColour) // TertiaryColor
COLORVAL(BackColour)
// SSA uses BackColour for both outline and shadow
// this will destroy SSA's TertiaryColour, but i'm not going to use it anyway
if (track->track_type == TRACK_TYPE_SSA)
target->OutlineColour = target->BackColour;
FPVAL(FontSize)
INTVAL(Bold)
INTVAL(Italic)
INTVAL(Underline)
INTVAL(StrikeOut)
FPVAL(Spacing)
INTVAL(Angle)
INTVAL(BorderStyle)
INTVAL(Alignment)
if (track->track_type == TRACK_TYPE_ASS)
target->Alignment = numpad2align(target->Alignment);
INTVAL(MarginL)
INTVAL(MarginR)
INTVAL(MarginV)
INTVAL(Encoding)
FPVAL(ScaleX)
FPVAL(ScaleY)
FPVAL(Outline)
FPVAL(Shadow)
}
}
style->ScaleX /= 100.;
style->ScaleY /= 100.;
style->Bold = !!style->Bold;
style->Italic = !!style->Italic;
style->Underline = !!style->Underline;
if (!style->Name)
style->Name = strdup("Default");
if (!style->FontName)
style->FontName = strdup("Arial");
// skip '@' at the start of the font name
if (*style->FontName == '@') {
p = style->FontName;
style->FontName = strdup(p + 1);
free(p);
}
free(format);
return 0;
}
static int process_styles_line(ASS_Track *track, char *str)
{
if (!strncmp(str, "Format:", 7)) {
char *p = str + 7;
skip_spaces(&p);
track->style_format = strdup(p);
ass_msg(track->library, MSGL_DBG2, "Style format: %s",
track->style_format);
} else if (!strncmp(str, "Style:", 6)) {
char *p = str + 6;
skip_spaces(&p);
process_style(track, p);
}
return 0;
}
static int process_info_line(ASS_Track *track, char *str)
{
if (!strncmp(str, "PlayResX:", 9)) {
track->PlayResX = atoi(str + 9);
} else if (!strncmp(str, "PlayResY:", 9)) {
track->PlayResY = atoi(str + 9);
} else if (!strncmp(str, "Timer:", 6)) {
track->Timer = atof(str + 6);
} else if (!strncmp(str, "WrapStyle:", 10)) {
track->WrapStyle = atoi(str + 10);
} else if (!strncmp(str, "ScaledBorderAndShadow:", 22)) {
track->ScaledBorderAndShadow = parse_bool(str + 22);
} else if (!strncmp(str, "Kerning:", 8)) {
track->Kerning = parse_bool(str + 8);
}
return 0;
}
static void event_format_fallback(ASS_Track *track)
{
track->parser_priv->state = PST_EVENTS;
if (track->track_type == TRACK_TYPE_SSA)
track->event_format = strdup("Format: Marked, Start, End, Style, "
"Name, MarginL, MarginR, MarginV, Effect, Text");
else
track->event_format = strdup("Format: Layer, Start, End, Style, "
"Actor, MarginL, MarginR, MarginV, Effect, Text");
ass_msg(track->library, MSGL_V,
"No event format found, using fallback");
}
static int process_events_line(ASS_Track *track, char *str)
{
if (!strncmp(str, "Format:", 7)) {
char *p = str + 7;
skip_spaces(&p);
track->event_format = strdup(p);
ass_msg(track->library, MSGL_DBG2, "Event format: %s", track->event_format);
} else if (!strncmp(str, "Dialogue:", 9)) {
// This should never be reached for embedded subtitles.
// They have slightly different format and are parsed in ass_process_chunk,
// called directly from demuxer
int eid;
ASS_Event *event;
str += 9;
skip_spaces(&str);
eid = ass_alloc_event(track);
event = track->events + eid;
// We can't parse events with event_format
if (!track->event_format)
event_format_fallback(track);
process_event_tail(track, event, str, 0);
} else {
ass_msg(track->library, MSGL_V, "Not understood: '%s'", str);
}
return 0;
}
// Copied from mkvtoolnix
static unsigned char *decode_chars(unsigned char c1, unsigned char c2,
unsigned char c3, unsigned char c4,
unsigned char *dst, int cnt)
{
uint32_t value;
unsigned char bytes[3];
int i;
value =
((c1 - 33) << 18) + ((c2 - 33) << 12) + ((c3 - 33) << 6) + (c4 -
33);
bytes[2] = value & 0xff;
bytes[1] = (value & 0xff00) >> 8;
bytes[0] = (value & 0xff0000) >> 16;
for (i = 0; i < cnt; ++i)
*dst++ = bytes[i];
return dst;
}
static int decode_font(ASS_Track *track)
{
unsigned char *p;
unsigned char *q;
int i;
int size; // original size
int dsize; // decoded size
unsigned char *buf = 0;
ass_msg(track->library, MSGL_V, "Font: %d bytes encoded data",
track->parser_priv->fontdata_used);
size = track->parser_priv->fontdata_used;
if (size % 4 == 1) {
ass_msg(track->library, MSGL_ERR, "Bad encoded data size");
goto error_decode_font;
}
buf = malloc(size / 4 * 3 + 2);
q = buf;
for (i = 0, p = (unsigned char *) track->parser_priv->fontdata;
i < size / 4; i++, p += 4) {
q = decode_chars(p[0], p[1], p[2], p[3], q, 3);
}
if (size % 4 == 2) {
q = decode_chars(p[0], p[1], 0, 0, q, 1);
} else if (size % 4 == 3) {
q = decode_chars(p[0], p[1], p[2], 0, q, 2);
}
dsize = q - buf;
assert(dsize <= size / 4 * 3 + 2);
if (track->library->extract_fonts) {
ass_add_font(track->library, track->parser_priv->fontname,
(char *) buf, dsize);
buf = 0;
}
error_decode_font:
if (buf)
free(buf);
free(track->parser_priv->fontname);
free(track->parser_priv->fontdata);
track->parser_priv->fontname = 0;
track->parser_priv->fontdata = 0;
track->parser_priv->fontdata_size = 0;
track->parser_priv->fontdata_used = 0;
return 0;
}
static int process_fonts_line(ASS_Track *track, char *str)
{
int len;
if (!strncmp(str, "fontname:", 9)) {
char *p = str + 9;
skip_spaces(&p);
if (track->parser_priv->fontname) {
decode_font(track);
}
track->parser_priv->fontname = strdup(p);
ass_msg(track->library, MSGL_V, "Fontname: %s",
track->parser_priv->fontname);
return 0;
}
if (!track->parser_priv->fontname) {
ass_msg(track->library, MSGL_V, "Not understood: '%s'", str);
return 0;
}
len = strlen(str);
if (len > 80) {
ass_msg(track->library, MSGL_WARN, "Font line too long: %d, %s",
len, str);
return 0;
}
if (track->parser_priv->fontdata_used + len >
track->parser_priv->fontdata_size) {
track->parser_priv->fontdata_size += 100 * 1024;
track->parser_priv->fontdata =
realloc(track->parser_priv->fontdata,
track->parser_priv->fontdata_size);
}
memcpy(track->parser_priv->fontdata + track->parser_priv->fontdata_used,
str, len);
track->parser_priv->fontdata_used += len;
return 0;
}
/**
* \brief Parse a header line
* \param track track
* \param str string to parse, zero-terminated
*/
static int process_line(ASS_Track *track, char *str)
{
if (!strncasecmp(str, "[Script Info]", 13)) {
track->parser_priv->state = PST_INFO;
} else if (!strncasecmp(str, "[V4 Styles]", 11)) {
track->parser_priv->state = PST_STYLES;
track->track_type = TRACK_TYPE_SSA;
} else if (!strncasecmp(str, "[V4+ Styles]", 12)) {
track->parser_priv->state = PST_STYLES;
track->track_type = TRACK_TYPE_ASS;
} else if (!strncasecmp(str, "[Events]", 8)) {
track->parser_priv->state = PST_EVENTS;
} else if (!strncasecmp(str, "[Fonts]", 7)) {
track->parser_priv->state = PST_FONTS;
} else {
switch (track->parser_priv->state) {
case PST_INFO:
process_info_line(track, str);
break;
case PST_STYLES:
process_styles_line(track, str);
break;
case PST_EVENTS:
process_events_line(track, str);
break;
case PST_FONTS:
process_fonts_line(track, str);
break;
default:
break;
}
}
// there is no explicit end-of-font marker in ssa/ass
if ((track->parser_priv->state != PST_FONTS)
&& (track->parser_priv->fontname))
decode_font(track);
return 0;
}
static int process_text(ASS_Track *track, char *str)
{
char *p = str;
while (1) {
char *q;
while (1) {
if ((*p == '\r') || (*p == '\n'))
++p;
else if (p[0] == '\xef' && p[1] == '\xbb' && p[2] == '\xbf')
p += 3; // U+FFFE (BOM)
else
break;
}
for (q = p; ((*q != '\0') && (*q != '\r') && (*q != '\n')); ++q) {
};
if (q == p)
break;
if (*q != '\0')
*(q++) = '\0';
process_line(track, p);
if (*q == '\0')
break;
p = q;
}
return 0;
}
/**
* \brief Process a chunk of subtitle stream data.
* \param track track
* \param data string to parse
* \param size length of data
*/
void ass_process_data(ASS_Track *track, char *data, int size)
{
char *str = malloc(size + 1);
memcpy(str, data, size);
str[size] = '\0';
ass_msg(track->library, MSGL_V, "Event: %s", str);
process_text(track, str);
free(str);
}
/**
* \brief Process CodecPrivate section of subtitle stream
* \param track track
* \param data string to parse
* \param size length of data
CodecPrivate section contains [Stream Info] and [V4+ Styles] ([V4 Styles] for SSA) sections
*/
void ass_process_codec_private(ASS_Track *track, char *data, int size)
{
ass_process_data(track, data, size);
// probably an mkv produced by ancient mkvtoolnix
// such files don't have [Events] and Format: headers
if (!track->event_format)
event_format_fallback(track);
ass_process_force_style(track);
}
static int check_duplicate_event(ASS_Track *track, int ReadOrder)
{
int i;
for (i = 0; i < track->n_events - 1; ++i) // ignoring last event, it is the one we are comparing with
if (track->events[i].ReadOrder == ReadOrder)
return 1;
return 0;
}
/**
* \brief Process a chunk of subtitle stream data. In Matroska, this contains 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 *track, char *data, int size,
long long timecode, long long duration)
{
char *str;
int eid;
char *p;
char *token;
ASS_Event *event;
if (!track->event_format) {
ass_msg(track->library, MSGL_WARN, "Event format header missing");
return;
}
str = malloc(size + 1);
memcpy(str, data, size);
str[size] = '\0';
ass_msg(track->library, MSGL_V, "Event at %" PRId64 ", +%" PRId64 ": %s",
(int64_t) timecode, (int64_t) duration, str);
eid = ass_alloc_event(track);
event = track->events + eid;
p = str;
do {
NEXT(p, token);
event->ReadOrder = atoi(token);
if (check_duplicate_event(track, event->ReadOrder))
break;
NEXT(p, token);
event->Layer = atoi(token);
process_event_tail(track, event, p, 3);
event->Start = timecode;
event->Duration = duration;
free(str);
return;
// dump_events(tid);
} while (0);
// some error
ass_free_event(track, eid);
track->n_events--;
free(str);
}
#ifdef CONFIG_ICONV
/** \brief recode buffer to utf-8
* constraint: codepage != 0
* \param data pointer to text buffer
* \param size buffer size
* \return a pointer to recoded buffer, caller is responsible for freeing it
**/
static char *sub_recode(ASS_Library *library, char *data, size_t size,
char *codepage)
{
iconv_t icdsc;
char *tocp = "UTF-8";
char *outbuf;
assert(codepage);
{
const char *cp_tmp = codepage;
#ifdef CONFIG_ENCA
char enca_lang[3], enca_fallback[100];
if (sscanf(codepage, "enca:%2s:%99s", enca_lang, enca_fallback) == 2
|| sscanf(codepage, "ENCA:%2s:%99s", enca_lang,
enca_fallback) == 2) {
cp_tmp =
ass_guess_buffer_cp(library, (unsigned char *) data, size,
enca_lang, enca_fallback);
}
#endif
if ((icdsc = iconv_open(tocp, cp_tmp)) != (iconv_t) (-1)) {
ass_msg(library, MSGL_V, "Opened iconv descriptor");
} else
ass_msg(library, MSGL_ERR, "Error opening iconv descriptor");
}
{
size_t osize = size;
size_t ileft = size;
size_t oleft = size - 1;
char *ip;
char *op;
size_t rc;
int clear = 0;
outbuf = malloc(osize);
ip = data;
op = outbuf;
while (1) {
if (ileft)
rc = iconv(icdsc, &ip, &ileft, &op, &oleft);
else { // clear the conversion state and leave
clear = 1;
rc = iconv(icdsc, NULL, NULL, &op, &oleft);
}
if (rc == (size_t) (-1)) {
if (errno == E2BIG) {
size_t offset = op - outbuf;
outbuf = (char *) realloc(outbuf, osize + size);
op = outbuf + offset;
osize += size;
oleft += size;
} else {
ass_msg(library, MSGL_WARN, "Error recoding file");
return NULL;
}
} else if (clear)
break;
}
outbuf[osize - oleft - 1] = 0;
}
if (icdsc != (iconv_t) (-1)) {
(void) iconv_close(icdsc);
icdsc = (iconv_t) (-1);
ass_msg(library, MSGL_V, "Closed iconv descriptor");
}
return outbuf;
}
#endif // ICONV
/**
* \brief read file contents into newly allocated buffer
* \param fname file name
* \param bufsize out: file size
* \return pointer to file contents. Caller is responsible for its deallocation.
*/
static char *read_file(ASS_Library *library, char *fname, size_t *bufsize)
{
int res;
long sz;
long bytes_read;
char *buf;
FILE *fp = fopen(fname, "rb");
if (!fp) {
ass_msg(library, MSGL_WARN,
"ass_read_file(%s): fopen failed", fname);
return 0;
}
res = fseek(fp, 0, SEEK_END);
if (res == -1) {
ass_msg(library, MSGL_WARN,
"ass_read_file(%s): fseek failed", fname);
fclose(fp);
return 0;
}
sz = ftell(fp);
rewind(fp);
if (sz > 10 * 1024 * 1024) {
ass_msg(library, MSGL_INFO,
"ass_read_file(%s): Refusing to load subtitles "
"larger than 10MiB", fname);
fclose(fp);
return 0;
}
ass_msg(library, MSGL_V, "File size: %ld", sz);
buf = malloc(sz + 1);
assert(buf);
bytes_read = 0;
do {
res = fread(buf + bytes_read, 1, sz - bytes_read, fp);
if (res <= 0) {
ass_msg(library, MSGL_INFO, "Read failed, %d: %s", errno,
strerror(errno));
fclose(fp);
free(buf);
return 0;
}
bytes_read += res;
} while (sz - bytes_read > 0);
buf[sz] = '\0';
fclose(fp);
if (bufsize)
*bufsize = sz;
return buf;
}
/*
* \param buf pointer to subtitle text in utf-8
*/
static ASS_Track *parse_memory(ASS_Library *library, char *buf)
{
ASS_Track *track;
int i;
track = ass_new_track(library);
// process header
process_text(track, buf);
// external SSA/ASS subs does not have ReadOrder field
for (i = 0; i < track->n_events; ++i)
track->events[i].ReadOrder = i;
// there is no explicit end-of-font marker in ssa/ass
if (track->parser_priv->fontname)
decode_font(track);
if (track->track_type == TRACK_TYPE_UNKNOWN) {
ass_free_track(track);
return 0;
}
ass_process_force_style(track);
return track;
}
/**
* \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 *ass_read_memory(ASS_Library *library, char *buf,
size_t bufsize, char *codepage)
{
ASS_Track *track;
int need_free = 0;
if (!buf)
return 0;
#ifdef CONFIG_ICONV
if (codepage) {
buf = sub_recode(library, buf, bufsize, codepage);
if (!buf)
return 0;
else
need_free = 1;
}
#endif
track = parse_memory(library, buf);
if (need_free)
free(buf);
if (!track)
return 0;
ass_msg(library, MSGL_INFO, "Added subtitle file: "
"<memory> (%d styles, %d events)",
track->n_styles, track->n_events);
return track;
}
static char *read_file_recode(ASS_Library *library, char *fname,
char *codepage, size_t *size)
{
char *buf;
size_t bufsize;
buf = read_file(library, fname, &bufsize);
if (!buf)
return 0;
#ifdef CONFIG_ICONV
if (codepage) {
char *tmpbuf = sub_recode(library, buf, bufsize, codepage);
free(buf);
buf = tmpbuf;
}
if (!buf)
return 0;
#endif
*size = bufsize;
return buf;
}
/**
* \brief Read subtitles from file.
* \param library libass library object
* \param fname file name
* \param codepage recode buffer contents from given codepage
* \return newly allocated track
*/
ASS_Track *ass_read_file(ASS_Library *library, char *fname,
char *codepage)
{
char *buf;
ASS_Track *track;
size_t bufsize;
buf = read_file_recode(library, fname, codepage, &bufsize);
if (!buf)
return 0;
track = parse_memory(library, buf);
free(buf);
if (!track)
return 0;
track->name = strdup(fname);
ass_msg(library, MSGL_INFO,
"Added subtitle file: '%s' (%d styles, %d events)",
fname, track->n_styles, track->n_events);
return track;
}
/**
* \brief read styles from file into already initialized track
*/
int ass_read_styles(ASS_Track *track, char *fname, char *codepage)
{
char *buf;
ParserState old_state;
size_t sz;
buf = read_file(track->library, fname, &sz);
if (!buf)
return 1;
#ifdef CONFIG_ICONV
if (codepage) {
char *tmpbuf;
tmpbuf = sub_recode(track->library, buf, sz, codepage);
free(buf);
buf = tmpbuf;
}
if (!buf)
return 0;
#endif
old_state = track->parser_priv->state;
track->parser_priv->state = PST_STYLES;
process_text(track, buf);
track->parser_priv->state = old_state;
return 0;
}
long long ass_step_sub(ASS_Track *track, long long now, int movement)
{
int i;
if (movement == 0)
return 0;
if (track->n_events == 0)
return 0;
if (movement < 0)
for (i = 0;
(i < track->n_events)
&&
((long long) (track->events[i].Start +
track->events[i].Duration) <= now); ++i) {
} else
for (i = track->n_events - 1;
(i >= 0) && ((long long) (track->events[i].Start) > now);
--i) {
}
// -1 and n_events are ok
assert(i >= -1);
assert(i <= track->n_events);
i += movement;
if (i < 0)
i = 0;
if (i >= track->n_events)
i = track->n_events - 1;
return ((long long) track->events[i].Start) - now;
}
ASS_Track *ass_new_track(ASS_Library *library)
{
ASS_Track *track = calloc(1, sizeof(ASS_Track));
track->library = library;
track->ScaledBorderAndShadow = 1;
track->parser_priv = calloc(1, sizeof(ASS_ParserPriv));
return track;
}
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