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/*
* Copyright (C) 2024 libass contributors
*
* This file is part of libass.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <inttypes.h>
#include <limits.h>
#include <math.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef _WIN32
#include <io.h>
#include <fcntl.h>
#include <sys/stat.h>
#endif
#include "writeout.h"
static const char *ycbcr_to_str(ASS_YCbCrMatrix ycbcr_val)
{
switch (ycbcr_val) {
case YCBCR_NONE: return "None";
case YCBCR_BT601_TV: return "TV.601";
case YCBCR_BT601_PC: return "PC.601";
case YCBCR_BT709_TV: return "TV.709";
case YCBCR_BT709_PC: return "PC.709";
case YCBCR_SMPTE240M_TV: return "TV.240m";
case YCBCR_SMPTE240M_PC: return "PC.240m";
case YCBCR_FCC_TV: return "TV.fcc";
case YCBCR_FCC_PC: return "PC.fcc";
case YCBCR_DEFAULT: return "ThereWasNoHeader";
case YCBCR_UNKNOWN:
default:
return "InvalidUnknownValue";
}
}
// Max size a parsed timestamp can occupy when printed as a string again
// (includes terminating null byte and sign indicators per field)
// = 13 + ceil(log10(INT32_MAX + 1ULL)) + 1
#define TIME_MAX_STRBUF_SIZE 24
static bool time_to_str(long long time, char (*buf)[TIME_MAX_STRBUF_SIZE])
{
time /= 10; // ASS files can only have centi-second precision
int sign = time < 0 ? -1 : 1;
time = llabs(time);
int32_t cs = time % 100; time /= 100;
int32_t s = time % 60; time /= 60;
int32_t m = time % 60; time /= 60;
int ret = snprintf(*buf, TIME_MAX_STRBUF_SIZE,
"%lld:%02"PRId32":%02"PRId32".%02"PRId32,
time * sign, m * sign, s * sign, cs * sign);
return ret >= 0 && ret < TIME_MAX_STRBUF_SIZE;
}
static int ssa2ass_align(int ssa_align)
{
return ((ssa_align & 0xC) >> 2) * 3 + (ssa_align & 0x3);
}
static const char *tracktype_to_str(int track_type)
{
switch (track_type) {
case TRACK_TYPE_ASS:
return "ASS";
case TRACK_TYPE_SSA:
return "SSA";
case TRACK_TYPE_UNKNOWN:
return "other";
}
return "(oops, track type list out of date)";
}
static void write_header(FILE *f, ASS_Track *track, const char *originalformat_name)
{
// format version is normalised to ASS
fprintf(f, "[Script Info]\n");
fprintf(f, "; Original Format: %s\n", originalformat_name);
fprintf(f, "ScriptType: v4.00+\n");
#define HEADER_INT(name) fprintf(f, "%s: %d\n", #name, track->name)
#define HEADER_FLT(name) fprintf(f, "%s: %.3f\n", #name, track->name)
#define HEADER_STR(name) if (track->name) fprintf(f, "%s: %s\n", #name, track->name)
#define HEADER_BOOL(name) fprintf(f, "%s: %s\n", #name, track->name ? "yes" : "no")
HEADER_INT(PlayResX);
HEADER_INT(PlayResY);
HEADER_INT(LayoutResX);
HEADER_INT(LayoutResY);
HEADER_FLT(Timer);
HEADER_INT(WrapStyle);
HEADER_BOOL(ScaledBorderAndShadow);
HEADER_BOOL(Kerning);
HEADER_STR(Language);
if (track->YCbCrMatrix != YCBCR_DEFAULT) /* Or normalise this to TV.601? */
fprintf(f, "YCbCr Matrix: %s\n", ycbcr_to_str(track->YCbCrMatrix));
#undef HEADER_INT
#undef HEADER_FLT
#undef HEADER_STR
#undef HEADER_BOOL
}
static void write_styles(FILE *f, ASS_Track *track)
{
fprintf(f, "\n[V4+ Styles]\n");
fprintf(f, "Format: "
"Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, "
"OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, "
"ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, "
"Alignment, MarginL, MarginR, MarginV, Encoding\n");
// don't print out builtin fallback
for (int i = 1; i < track->n_styles; i++) {
ASS_Style *s = track->styles + i;
fprintf(f, "Style: "
"%s,%s,%.3f,&H%08X,&H%08X,&H%08X,&H%08X,%d,%d,%d,%d,"
"%.3f,%.3f,%.3f,%.3f,%d,%.3f,%.3f,%d,%d,%d,%d,%d\n",
s->Name, s->FontName, s->FontSize, s->PrimaryColour, s->SecondaryColour,
s->OutlineColour, s->BackColour, s->Bold, s->Italic, s->Underline, s->StrikeOut,
s->ScaleX, s->ScaleY, s->Spacing, s->Angle, s->BorderStyle, s->Outline, s->Shadow,
ssa2ass_align(s->Alignment), s->MarginL, s->MarginR, s->MarginV, s->Encoding);
}
}
static void write_events(FILE *f, ASS_Track *track)
{
char start[TIME_MAX_STRBUF_SIZE];
char end[TIME_MAX_STRBUF_SIZE];
fprintf(f, "\n[Events]\n");
fprintf(f, "Format: "
"Layer, Start, End, Style, Name, "
"MarginL, MarginR, MarginV, Effect, Text\n");
for (int i = 0; i < track->n_events; i++) {
ASS_Event *e = track->events + i;
bool flag = time_to_str(e->Start, &start);
flag = flag && time_to_str(e->Start + e->Duration, &end);
if (!flag) {
printf("Omitting event %d due to timestamp failure!\n", i);
fprintf(f, "Comment: Skipped event\n");
continue;
}
fprintf(f, "Dialogue: %d,%s,%s,%s,%s,%03d,%03d,%03d,%s,%s\n",
e->Layer, start, end, (track->styles + e->Style)->Name, e->Name,
e->MarginL, e->MarginR, e->MarginV, e->Effect, e->Text);
}
}
void write_out_track(ASS_Track *track, const char *outpath)
{
const char *originalformat_name = tracktype_to_str(track->track_type);
printf("Parsed sub stats:\n");
printf(" Format Version: %s\n", originalformat_name);
printf(" #Styles: %d\n", track->n_styles - 1); // exclude builtin fallback
printf(" #Events: %d\n", track->n_events);
FILE *f = NULL;
if (outpath) {
f = fopen(outpath, "w");
printf("Parsed File will be written to: %s\n", outpath);
} else {
char filename[] = "/tmp/parsedSubs_XXXXXX";
#ifdef _WIN32
_mktemp(filename);
int fd = _open(filename, O_CREAT | _O_EXCL | _O_WRONLY, _S_IREAD | _S_IWRITE);
#else
int fd = mkstemp(filename);
#endif
if (fd == -1) {
printf("Failed to acquire temporary file!\n");
return;
}
f = fdopen(fd, "w");
if (!f) {
printf("Failed to associate fd with a stream!\n");
return;
}
printf("Parsed File will be written to: %.*s\n", (int) sizeof(filename), filename);
}
// Write content normalised to ASS (v4+)
write_header(f, track, originalformat_name);
fprintf(f, "\n; Potential embedded fonts are lost in write out\n");
write_styles(f, track);
write_events(f, track);
fclose(f);
}
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