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mpv/libass/ass.c

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#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef HAVE_ENCA
#include "subreader.h" // for guess_buffer_cp
#endif
#ifdef USE_ICONV
#include <iconv.h>
extern char *sub_cp;
#endif
#include "mp_msg.h"
#include "ass.h"
#include "ass_utils.h"
#include "libvo/sub.h" // for utf8_get_char
char *get_path(char *);
#define ASS_STYLES_ALLOC 20
#define ASS_EVENTS_ALLOC 200
void ass_free_track(ass_track_t* track) {
int i;
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_style_t* style = track->styles + i;
if (style->Name)
free(style->Name);
if (style->FontName)
free(style->FontName);
}
free(track->styles);
}
if (track->events) {
for (i = 0; i < track->n_events; ++i) {
ass_event_t* event = track->events + i;
if (event->Name)
free(event->Name);
if (event->Effect)
free(event->Effect);
if (event->Text)
free(event->Text);
}
free(track->events);
}
}
/// \brief Allocate a new style struct
/// \param track track
/// \return style id
int ass_alloc_style(ass_track_t* 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_t*)realloc(track->styles, sizeof(ass_style_t)*track->max_styles);
}
sid = track->n_styles++;
memset(track->styles + sid, 0, sizeof(ass_style_t));
return sid;
}
/// \brief Allocate a new event struct
/// \param track track
/// \return event id
int ass_alloc_event(ass_track_t* 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_t*)realloc(track->events, sizeof(ass_event_t)*track->max_events);
}
eid = track->n_events++;
memset(track->events + eid, 0, sizeof(ass_event_t));
return eid;
}
static void free_event(ass_track_t* track, int eid) {
if (track->n_events > eid + 1) // not last event
memcpy(track->events + eid, track->events + eid + 1, sizeof(ass_event_t) * (track->n_events - eid - 1));
track->n_events--;
}
static int events_compare_f(const void* a_, const void* b_) {
ass_event_t* a = (ass_event_t*)a_;
ass_event_t* b = (ass_event_t*)b_;
if (a->Start < b->Start)
return -1;
else if (a->Start > b->Start)
return 1;
else
return 0;
}
/// \brief Sort events by start time
/// \param tid track id
static void sort_events(ass_track_t* track) {
qsort(track->events, track->n_events, sizeof(ass_event_t), events_compare_f);
}
// ==============================================================================================
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_t* track, char* name) {
int i;
for (i=0; i<track->n_styles; ++i) {
// FIXME: mb strcasecmp ?
if (strcmp(track->styles[i].Name, name) == 0)
return i;
}
i = track->default_style;
mp_msg(MSGT_GLOBAL, MSGL_WARN, "[%p] Warning: no style named '%s' found, using '%s'\n", track, name, track->styles[i].Name);
return i; // use the first style
}
static uint32_t string2color(char* p) {
uint32_t tmp;
(void)strtocolor(&p, &tmp);
return tmp;
}
static long long string2timecode(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) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "bad timestamp\n");
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); \
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "%s = %s\n", #name, token);
#define STRVAL(name) ANYVAL(name,strdup)
#define COLORVAL(name) ANYVAL(name,string2color)
#define INTVAL(name) ANYVAL(name,atoi)
#define FPVAL(name) ANYVAL(name,atof)
#define TIMEVAL(name) ANYVAL(name,string2timecode)
#define STYLEVAL(name) \
} else if (strcasecmp(tname, #name) == 0) { \
target->name = lookup_style(track, token); \
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "%s = %s\n", #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_t* track, ass_event_t* event, char* str, int n_ignored)
{
char* token;
char* tname;
char* p = str;
int i;
ass_event_t* target = event;
char* format = strdup(track->event_format);
char* q = format; // format scanning pointer
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);
last = event->Text + strlen(event->Text) - 1;
if (*last == '\r')
*last = 0;
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "Text = %s\n", 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 ;)
STYLEVAL(Style)
STRVAL(Name)
STRVAL(Effect)
INTVAL(MarginL)
INTVAL(MarginR)
INTVAL(MarginV)
TIMEVAL(Start)
TIMEVAL(Duration)
}
}
free(format);
return 1;
}
/**
* \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_t* track, char *str)
{
char* token;
char* tname;
char* p = str;
char* format;
char* q; // format scanning pointer
int sid;
ass_style_t* style;
ass_style_t* 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);
mp_msg(MSGT_GLOBAL, MSGL_V, "[%p] Style: %s\n", 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);
// ALIAS(TertiaryColour,OutlineColour) // ignore TertiaryColour; it appears only in SSA, and is overridden by BackColour
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;
INTVAL(FontSize)
INTVAL(Bold)
INTVAL(Italic)
INTVAL(Underline)
INTVAL(StrikeOut)
INTVAL(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.;
if (!style->Name)
style->Name = strdup("Default");
if (!style->FontName)
style->FontName = strdup("Arial");
free(format);
return 0;
}
/**
* \brief Parse a header line
* \param track track
* \param str string to parse, zero-terminated
*/
static int process_header_line(ass_track_t* track, char *str)
{
static int events_section_started = 0;
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "=== Header: %s\n", str);
if (strncmp(str, "PlayResX:", 9)==0) {
track->PlayResX = atoi(str + 9);
} else if (strncmp(str,"PlayResY:", 9)==0) {
track->PlayResY = atoi(str + 9);
} else if (strncmp(str,"Timer:", 6)==0) {
track->Timer = atof(str + 6);
} else if (strstr(str,"Styles]")) {
events_section_started = 0;
if (strchr(str, '+'))
track->track_type = TRACK_TYPE_ASS;
else
track->track_type = TRACK_TYPE_SSA;
} else if (strncmp(str,"[Events]", 8)==0) {
events_section_started = 1;
} else if (strncmp(str,"Format:", 7)==0) {
char* p = str + 7;
skip_spaces(&p);
if (events_section_started) {
track->event_format = strdup(p);
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "Event format: %s\n", track->event_format);
} else {
track->style_format = strdup(p);
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "Style format: %s\n", track->style_format);
}
} else if (strncmp(str,"Style:", 6)==0) {
char* p = str + 6;
skip_spaces(&p);
process_style(track, p);
} else if (strncmp(str,"WrapStyle:", 10)==0) {
track->WrapStyle = atoi(str + 10);
}
return 0;
}
/**
* \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] sections
*/
void ass_process_chunk(ass_track_t* track, char *data, int size)
{
char* str = malloc(size + 1);
char* p;
int sid;
memcpy(str, data, size);
str[size] = '\0';
p = str;
while(1) {
char* q;
for (;((*p=='\r')||(*p=='\n'));++p) {}
for (q=p; ((*q!='\0')&&(*q!='\r')&&(*q!='\n')); ++q) {};
if (q==p)
break;
if (*q != '\0')
*(q++) = '\0';
process_header_line(track, p);
if (*q == '\0')
break;
p = q;
}
free(str);
// 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)
sid = ass_alloc_style(track);
track->styles[sid].Name = strdup("Default");
track->styles[sid].FontName = strdup("Arial");
if (!track->event_format) {
// probably an mkv produced by ancient mkvtoolnix
// such files don't have [Events] and Format: headers
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");
}
}
static int check_duplicate_event(ass_track_t* 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 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_line(ass_track_t* track, char *data, int size, long long timecode, long long duration)
{
char* str;
int eid;
char* p;
char* token;
ass_event_t* event;
if (!track->event_format) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "Event format header missing\n");
return;
}
str = malloc(size + 1);
memcpy(str, data, size);
str[size] = '\0';
mp_msg(MSGT_GLOBAL, MSGL_V, "\nline at timecode %lld, duration %lld: \n%s\n", timecode, 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
free_event(track, eid);
free(str);
}
/**
* \brief Process a line from external file.
* \param track track
* \param str string to parse
* \param size length of data
*/
static void ass_process_external_line(ass_track_t* track, char *str, int size)
{
int eid;
ass_event_t* event;
eid = ass_alloc_event(track);
event = track->events + eid;
if (strncmp("Dialogue:", str, 9) != 0)
return;
str += 9;
while (*str == ' ') {++str;}
process_event_tail(track, event, str, 0);
}
#ifdef USE_ICONV
/** \brief recode buffer to utf-8
* constraint: sub_cp != 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(char* data, size_t size)
{
static iconv_t icdsc = (iconv_t)(-1);
char* tocp = "UTF-8";
char* outbuf;
assert(sub_cp);
{
char* cp_tmp = sub_cp;
#ifdef HAVE_ENCA
char enca_lang[3], enca_fallback[100];
if (sscanf(sub_cp, "enca:%2s:%99s", enca_lang, enca_fallback) == 2
|| sscanf(sub_cp, "ENCA:%2s:%99s", enca_lang, enca_fallback) == 2) {
cp_tmp = guess_buffer_cp((unsigned char*)data, size, enca_lang, enca_fallback);
}
#endif
if ((icdsc = iconv_open (tocp, cp_tmp)) != (iconv_t)(-1)){
mp_msg(MSGT_SUBREADER,MSGL_V,"LIBSUB: opened iconv descriptor.\n");
} else
mp_msg(MSGT_SUBREADER,MSGL_ERR,"LIBSUB: error opening iconv descriptor.\n");
#ifdef HAVE_ENCA
if (cp_tmp) free(cp_tmp);
#endif
}
{
size_t osize = size;
size_t ileft = size;
size_t oleft = size - 1;
char* ip;
char* op;
size_t rc;
outbuf = malloc(size);
ip = data;
op = outbuf;
while (ileft) {
rc = iconv(icdsc, &ip, &ileft, &op, &oleft);
if (rc == (size_t)(-1)) {
if (errno == E2BIG) {
int offset = op - outbuf;
outbuf = (char*)realloc(outbuf, osize + size);
op = outbuf + offset;
osize += size;
oleft += size;
} else {
mp_msg(MSGT_SUBREADER, MSGL_WARN, "LIBSUB: error recoding file.\n");
return NULL;
}
}
}
outbuf[osize - oleft - 1] = 0;
}
if (icdsc != (iconv_t)(-1)) {
(void)iconv_close(icdsc);
icdsc = (iconv_t)(-1);
mp_msg(MSGT_SUBREADER,MSGL_V,"LIBSUB: closed iconv descriptor.\n");
}
return outbuf;
}
#endif // ICONV
/**
* \brief Read subtitles from file.
* \param fname file name
* \return newly allocated track
*/
ass_track_t* ass_read_file(char* fname)
{
int res;
long sz;
long bytes_read;
char* buf;
char* p;
int events_reached;
ass_track_t* track;
FILE* fp = fopen(fname, "rb");
if (!fp) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "ass_read_file(%s): fopen failed\n", fname);
return 0;
}
res = fseek(fp, 0, SEEK_END);
if (res == -1) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "ass_read_file(%s): fseek failed\n", fname);
fclose(fp);
return 0;
}
sz = ftell(fp);
rewind(fp);
if (sz > 10*1024*1024) {
mp_msg(MSGT_GLOBAL, MSGL_INFO, "ass_read_file(%s): Refusing to load subtitles larger than 10M\n", fname);
fclose(fp);
return 0;
}
mp_msg(MSGT_GLOBAL, MSGL_V, "file size: %ld\n", sz);
buf = malloc(sz + 1);
assert(buf);
bytes_read = 0;
do {
res = fread(buf + bytes_read, 1, sz - bytes_read, fp);
if (res <= 0) {
mp_msg(MSGT_GLOBAL, MSGL_INFO, "Read failed, %d: %s\n", errno, strerror(errno));
fclose(fp);
free(buf);
return 0;
}
bytes_read += res;
} while (sz - bytes_read > 0);
buf[sz] = '\0';
fclose(fp);
#ifdef USE_ICONV
if (sub_cp) {
char* tmpbuf = sub_recode(buf, sz);
free(buf);
if (!tmpbuf)
return 0;
buf = tmpbuf;
}
#endif
track = ass_new_track();
track->name = strdup(fname);
// process header
events_reached = 0;
p = buf;
while (p && (*p)) {
while (*p == '\n') {++p;}
if (strncmp(p, "[Events]", 8) == 0) {
events_reached = 1;
} else if ((strncmp(p, "Format:", 7) == 0) && (events_reached)) {
p = strchr(p, '\n');
if (p == 0) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "Incomplete subtitles\n");
free(buf);
return 0;
}
ass_process_chunk(track, buf, p - buf + 1);
++p;
break;
}
p = strchr(p, '\n');
}
// process events
while (p && (*p)) {
char* next;
int len;
while (*p == '\n') {++p;}
next = strchr(p, '\n');
len = 0;
if (next) {
len = next - p;
*next = 0;
} else {
len = strlen(p);
}
ass_process_external_line(track, p, len);
if (next) {
p = next + 1;
continue;
} else
break;
}
free(buf);
if (!events_reached) {
ass_free_track(track);
return 0;
}
mp_msg(MSGT_GLOBAL, MSGL_INFO, "LIBASS: added subtitle file: %s (%d styles, %d events)\n", fname, track->n_styles, track->n_events);
sort_events(track);
// dump_events(forced_tid);
return track;
}
static char* validate_fname(char* name)
{
char* fname;
char* p;
char* q;
unsigned code;
int sz = strlen(name);
q = fname = malloc(sz + 1);
p = name;
while (*p) {
code = utf8_get_char(&p);
if (code == 0)
break;
if ( (code > 0x7F) ||
(code == '\\') ||
(code == '/') ||
(code == ':') ||
(code == '*') ||
(code == '?') ||
(code == '<') ||
(code == '>') ||
(code == '|') ||
(code == 0))
{
*q++ = '_';
} else {
*q++ = code;
}
if (p - name > sz)
break;
}
*q = 0;
return fname;
}
/**
* \brief Process embedded matroska font. Saves it to ~/.mplayer/fonts.
* \param name attachment name
* \param data binary font data
* \param data_size data size
*/
void ass_process_font(const char* name, char* data, int data_size)
{
char buf[1000];
FILE* fp = 0;
int rc;
struct stat st;
char* fname;
char* fonts_dir = get_path("fonts");
rc = stat(fonts_dir, &st);
if (rc) {
int res;
#ifndef __MINGW32__
res = mkdir(fonts_dir, 0700);
#else
res = mkdir(fonts_dir);
#endif
if (res) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "Failed to create: %s\n", fonts_dir);
}
} else if (!S_ISDIR(st.st_mode)) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "Not a directory: %s\n", fonts_dir);
}
fname = validate_fname((char*)name);
snprintf(buf, 1000, "%s/%s", fonts_dir, fname);
free(fname);
free(fonts_dir);
fp = fopen(buf, "wb");
if (!fp) return;
fwrite(data, data_size, 1, fp);
fclose(fp);
}
long long ass_step_sub(ass_track_t* 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_t* ass_new_track(void) {
ass_track_t* track = calloc(1, sizeof(ass_track_t));
return track;
}
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