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ffmpeg/libavcodec/ass_split.c
John Stebbins a52eef68d4 lavc/ass_split: fix parsing utf8 scripts 
The [Script Info] section was skipped if starts with UTF8 BOM

Signed-off-by: Philip Langdale <philipl@overt.org>
2020-04-10 09:32:13 -07:00

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/*
* SSA/ASS spliting functions
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "ass_split.h"
typedef enum {
ASS_STR,
ASS_INT,
ASS_FLT,
ASS_COLOR,
ASS_TIMESTAMP,
ASS_ALGN,
} ASSFieldType;
typedef struct {
const char *name;
int type;
int offset;
} ASSFields;
typedef struct {
const char *section;
const char *format_header;
const char *fields_header;
int size;
int offset;
int offset_count;
ASSFields fields[24];
} ASSSection;
static const ASSSection ass_sections[] = {
{ .section = "Script Info",
.offset = offsetof(ASS, script_info),
.fields = {{"ScriptType", ASS_STR, offsetof(ASSScriptInfo, script_type)},
{"Collisions", ASS_STR, offsetof(ASSScriptInfo, collisions) },
{"PlayResX", ASS_INT, offsetof(ASSScriptInfo, play_res_x) },
{"PlayResY", ASS_INT, offsetof(ASSScriptInfo, play_res_y) },
{"Timer", ASS_FLT, offsetof(ASSScriptInfo, timer) },
{0},
}
},
{ .section = "V4+ Styles",
.format_header = "Format",
.fields_header = "Style",
.size = sizeof(ASSStyle),
.offset = offsetof(ASS, styles),
.offset_count = offsetof(ASS, styles_count),
.fields = {{"Name", ASS_STR, offsetof(ASSStyle, name) },
{"Fontname", ASS_STR, offsetof(ASSStyle, font_name) },
{"Fontsize", ASS_INT, offsetof(ASSStyle, font_size) },
{"PrimaryColour", ASS_COLOR, offsetof(ASSStyle, primary_color) },
{"SecondaryColour", ASS_COLOR, offsetof(ASSStyle, secondary_color)},
{"OutlineColour", ASS_COLOR, offsetof(ASSStyle, outline_color) },
{"BackColour", ASS_COLOR, offsetof(ASSStyle, back_color) },
{"Bold", ASS_INT, offsetof(ASSStyle, bold) },
{"Italic", ASS_INT, offsetof(ASSStyle, italic) },
{"Underline", ASS_INT, offsetof(ASSStyle, underline) },
{"StrikeOut", ASS_INT, offsetof(ASSStyle, strikeout) },
{"ScaleX", ASS_FLT, offsetof(ASSStyle, scalex) },
{"ScaleY", ASS_FLT, offsetof(ASSStyle, scaley) },
{"Spacing", ASS_FLT, offsetof(ASSStyle, spacing) },
{"Angle", ASS_FLT, offsetof(ASSStyle, angle) },
{"BorderStyle", ASS_INT, offsetof(ASSStyle, border_style) },
{"Outline", ASS_FLT, offsetof(ASSStyle, outline) },
{"Shadow", ASS_FLT, offsetof(ASSStyle, shadow) },
{"Alignment", ASS_INT, offsetof(ASSStyle, alignment) },
{"MarginL", ASS_INT, offsetof(ASSStyle, margin_l) },
{"MarginR", ASS_INT, offsetof(ASSStyle, margin_r) },
{"MarginV", ASS_INT, offsetof(ASSStyle, margin_v) },
{"Encoding", ASS_INT, offsetof(ASSStyle, encoding) },
{0},
}
},
{ .section = "V4 Styles",
.format_header = "Format",
.fields_header = "Style",
.size = sizeof(ASSStyle),
.offset = offsetof(ASS, styles),
.offset_count = offsetof(ASS, styles_count),
.fields = {{"Name", ASS_STR, offsetof(ASSStyle, name) },
{"Fontname", ASS_STR, offsetof(ASSStyle, font_name) },
{"Fontsize", ASS_INT, offsetof(ASSStyle, font_size) },
{"PrimaryColour", ASS_COLOR, offsetof(ASSStyle, primary_color) },
{"SecondaryColour", ASS_COLOR, offsetof(ASSStyle, secondary_color)},
{"TertiaryColour", ASS_COLOR, offsetof(ASSStyle, outline_color) },
{"BackColour", ASS_COLOR, offsetof(ASSStyle, back_color) },
{"Bold", ASS_INT, offsetof(ASSStyle, bold) },
{"Italic", ASS_INT, offsetof(ASSStyle, italic) },
{"BorderStyle", ASS_INT, offsetof(ASSStyle, border_style) },
{"Outline", ASS_FLT, offsetof(ASSStyle, outline) },
{"Shadow", ASS_FLT, offsetof(ASSStyle, shadow) },
{"Alignment", ASS_ALGN, offsetof(ASSStyle, alignment) },
{"MarginL", ASS_INT, offsetof(ASSStyle, margin_l) },
{"MarginR", ASS_INT, offsetof(ASSStyle, margin_r) },
{"MarginV", ASS_INT, offsetof(ASSStyle, margin_v) },
{"AlphaLevel", ASS_INT, offsetof(ASSStyle, alpha_level) },
{"Encoding", ASS_INT, offsetof(ASSStyle, encoding) },
{0},
}
},
{ .section = "Events",
.format_header = "Format",
.fields_header = "Dialogue",
.size = sizeof(ASSDialog),
.offset = offsetof(ASS, dialogs),
.offset_count = offsetof(ASS, dialogs_count),
.fields = {{"Layer", ASS_INT, offsetof(ASSDialog, layer) },
{"Start", ASS_TIMESTAMP, offsetof(ASSDialog, start) },
{"End", ASS_TIMESTAMP, offsetof(ASSDialog, end) },
{"Style", ASS_STR, offsetof(ASSDialog, style) },
{"Name", ASS_STR, offsetof(ASSDialog, name) },
{"MarginL", ASS_INT, offsetof(ASSDialog, margin_l)},
{"MarginR", ASS_INT, offsetof(ASSDialog, margin_r)},
{"MarginV", ASS_INT, offsetof(ASSDialog, margin_v)},
{"Effect", ASS_STR, offsetof(ASSDialog, effect) },
{"Text", ASS_STR, offsetof(ASSDialog, text) },
{0},
}
},
};
typedef int (*ASSConvertFunc)(void *dest, const char *buf, int len);
static int convert_str(void *dest, const char *buf, int len)
{
char *str = av_malloc(len + 1);
if (str) {
memcpy(str, buf, len);
str[len] = 0;
if (*(void **)dest)
av_free(*(void **)dest);
*(char **)dest = str;
}
return !str;
}
static int convert_int(void *dest, const char *buf, int len)
{
return sscanf(buf, "%d", (int *)dest) == 1;
}
static int convert_flt(void *dest, const char *buf, int len)
{
return sscanf(buf, "%f", (float *)dest) == 1;
}
static int convert_color(void *dest, const char *buf, int len)
{
return sscanf(buf, "&H%8x", (int *)dest) == 1 ||
sscanf(buf, "%d", (int *)dest) == 1;
}
static int convert_timestamp(void *dest, const char *buf, int len)
{
int c, h, m, s, cs;
if ((c = sscanf(buf, "%d:%02d:%02d.%02d", &h, &m, &s, &cs)) == 4)
*(int *)dest = 360000*h + 6000*m + 100*s + cs;
return c == 4;
}
static int convert_alignment(void *dest, const char *buf, int len)
{
int a;
if (sscanf(buf, "%d", &a) == 1) {
/* convert V4 Style alignment to V4+ Style */
*(int *)dest = a + ((a&4) >> 1) - 5*!!(a&8);
return 1;
}
return 0;
}
static const ASSConvertFunc convert_func[] = {
[ASS_STR] = convert_str,
[ASS_INT] = convert_int,
[ASS_FLT] = convert_flt,
[ASS_COLOR] = convert_color,
[ASS_TIMESTAMP] = convert_timestamp,
[ASS_ALGN] = convert_alignment,
};
struct ASSSplitContext {
ASS ass;
int current_section;
int field_number[FF_ARRAY_ELEMS(ass_sections)];
int *field_order[FF_ARRAY_ELEMS(ass_sections)];
};
static uint8_t *realloc_section_array(ASSSplitContext *ctx)
{
const ASSSection *section = &ass_sections[ctx->current_section];
int *count = (int *)((uint8_t *)&ctx->ass + section->offset_count);
void **section_ptr = (void **)((uint8_t *)&ctx->ass + section->offset);
uint8_t *tmp = av_realloc_array(*section_ptr, (*count+1), section->size);
if (!tmp)
return NULL;
*section_ptr = tmp;
tmp += *count * section->size;
memset(tmp, 0, section->size);
(*count)++;
return tmp;
}
static inline int is_eol(char buf)
{
return buf == '\r' || buf == '\n' || buf == 0;
}
static inline const char *skip_space(const char *buf)
{
while (*buf == ' ')
buf++;
return buf;
}
static int *get_default_field_orders(const ASSSection *section, int *number)
{
int i;
int *order = av_malloc_array(FF_ARRAY_ELEMS(section->fields), sizeof(*order));
if (!order)
return NULL;
for (i = 0; section->fields[i].name; i++)
order[i] = i;
*number = i;
while (i < FF_ARRAY_ELEMS(section->fields))
order[i++] = -1;
return order;
}
static const char *ass_split_section(ASSSplitContext *ctx, const char *buf)
{
const ASSSection *section = &ass_sections[ctx->current_section];
int *number = &ctx->field_number[ctx->current_section];
int *order = ctx->field_order[ctx->current_section];
int i, len;
while (buf && *buf) {
if (buf[0] == '[') {
ctx->current_section = -1;
break;
}
if (buf[0] == ';' || (buf[0] == '!' && buf[1] == ':'))
goto next_line; // skip comments
len = strcspn(buf, ":\r\n");
if (buf[len] == ':' &&
(!section->fields_header || strncmp(buf, section->fields_header, len))) {
for (i = 0; i < FF_ARRAY_ELEMS(ass_sections); i++) {
if (ass_sections[i].fields_header &&
!strncmp(buf, ass_sections[i].fields_header, len)) {
ctx->current_section = i;
section = &ass_sections[ctx->current_section];
number = &ctx->field_number[ctx->current_section];
order = ctx->field_order[ctx->current_section];
break;
}
}
}
if (section->format_header && !order) {
len = strlen(section->format_header);
if (!strncmp(buf, section->format_header, len) && buf[len] == ':') {
buf += len + 1;
while (!is_eol(*buf)) {
buf = skip_space(buf);
len = strcspn(buf, ", \r\n");
if (av_reallocp_array(&order, (*number + 1), sizeof(*order)) != 0)
return NULL;
order[*number] = -1;
for (i=0; section->fields[i].name; i++)
if (!strncmp(buf, section->fields[i].name, len)) {
order[*number] = i;
break;
}
(*number)++;
buf = skip_space(buf + len + (buf[len] == ','));
}
ctx->field_order[ctx->current_section] = order;
goto next_line;
}
}
if (section->fields_header) {
len = strlen(section->fields_header);
if (!strncmp(buf, section->fields_header, len) && buf[len] == ':') {
uint8_t *ptr, *struct_ptr = realloc_section_array(ctx);
if (!struct_ptr) return NULL;
/* No format header line found so far, assume default */
if (!order) {
order = get_default_field_orders(section, number);
if (!order)
return NULL;
ctx->field_order[ctx->current_section] = order;
}
buf += len + 1;
for (i=0; !is_eol(*buf) && i < *number; i++) {
int last = i == *number - 1;
buf = skip_space(buf);
len = strcspn(buf, last ? "\r\n" : ",\r\n");
if (order[i] >= 0) {
ASSFieldType type = section->fields[order[i]].type;
ptr = struct_ptr + section->fields[order[i]].offset;
convert_func[type](ptr, buf, len);
}
buf += len;
if (!last && *buf) buf++;
buf = skip_space(buf);
}
}
} else {
len = strcspn(buf, ":\r\n");
if (buf[len] == ':') {
for (i=0; section->fields[i].name; i++)
if (!strncmp(buf, section->fields[i].name, len)) {
ASSFieldType type = section->fields[i].type;
uint8_t *ptr = (uint8_t *)&ctx->ass + section->offset;
ptr += section->fields[i].offset;
buf = skip_space(buf + len + 1);
convert_func[type](ptr, buf, strcspn(buf, "\r\n"));
break;
}
}
}
next_line:
buf += strcspn(buf, "\n");
buf += !!*buf;
}
return buf;
}
static int ass_split(ASSSplitContext *ctx, const char *buf)
{
char c, section[16];
int i;
if (ctx->current_section >= 0)
buf = ass_split_section(ctx, buf);
while (buf && *buf) {
if (sscanf(buf, "[%15[0-9A-Za-z+ ]]%c", section, &c) == 2) {
buf += strcspn(buf, "\n");
buf += !!*buf;
for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++)
if (!strcmp(section, ass_sections[i].section)) {
ctx->current_section = i;
buf = ass_split_section(ctx, buf);
}
} else {
buf += strcspn(buf, "\n");
buf += !!*buf;
}
}
return buf ? 0 : AVERROR_INVALIDDATA;
}
ASSSplitContext *ff_ass_split(const char *buf)
{
ASSSplitContext *ctx = av_mallocz(sizeof(*ctx));
if (!ctx)
return NULL;
if (buf && !memcmp(buf, "\xef\xbb\xbf", 3)) // Skip UTF-8 BOM header
buf += 3;
ctx->current_section = -1;
if (ass_split(ctx, buf) < 0) {
ff_ass_split_free(ctx);
return NULL;
}
return ctx;
}
static void free_section(ASSSplitContext *ctx, const ASSSection *section)
{
uint8_t *ptr = (uint8_t *)&ctx->ass + section->offset;
int i, j, *count, c = 1;
if (section->format_header) {
ptr = *(void **)ptr;
count = (int *)((uint8_t *)&ctx->ass + section->offset_count);
} else
count = &c;
if (ptr)
for (i=0; i<*count; i++, ptr += section->size)
for (j=0; section->fields[j].name; j++) {
const ASSFields *field = &section->fields[j];
if (field->type == ASS_STR)
av_freep(ptr + field->offset);
}
*count = 0;
if (section->format_header)
av_freep((uint8_t *)&ctx->ass + section->offset);
}
ASSDialog *ff_ass_split_dialog(ASSSplitContext *ctx, const char *buf,
int cache, int *number)
{
ASSDialog *dialog = NULL;
int i, count;
if (!cache)
for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++)
if (!strcmp(ass_sections[i].section, "Events")) {
free_section(ctx, &ass_sections[i]);
break;
}
count = ctx->ass.dialogs_count;
if (ass_split(ctx, buf) == 0)
dialog = ctx->ass.dialogs + count;
if (number)
*number = ctx->ass.dialogs_count - count;
return dialog;
}
void ff_ass_free_dialog(ASSDialog **dialogp)
{
ASSDialog *dialog = *dialogp;
if (!dialog)
return;
av_freep(&dialog->style);
av_freep(&dialog->name);
av_freep(&dialog->effect);
av_freep(&dialog->text);
av_freep(dialogp);
}
ASSDialog *ff_ass_split_dialog2(ASSSplitContext *ctx, const char *buf)
{
int i;
static const ASSFields fields[] = {
{"ReadOrder", ASS_INT, offsetof(ASSDialog, readorder)},
{"Layer", ASS_INT, offsetof(ASSDialog, layer) },
{"Style", ASS_STR, offsetof(ASSDialog, style) },
{"Name", ASS_STR, offsetof(ASSDialog, name) },
{"MarginL", ASS_INT, offsetof(ASSDialog, margin_l) },
{"MarginR", ASS_INT, offsetof(ASSDialog, margin_r) },
{"MarginV", ASS_INT, offsetof(ASSDialog, margin_v) },
{"Effect", ASS_STR, offsetof(ASSDialog, effect) },
{"Text", ASS_STR, offsetof(ASSDialog, text) },
};
ASSDialog *dialog = av_mallocz(sizeof(*dialog));
if (!dialog)
return NULL;
for (i = 0; i < FF_ARRAY_ELEMS(fields); i++) {
size_t len;
const int last = i == FF_ARRAY_ELEMS(fields) - 1;
const ASSFieldType type = fields[i].type;
uint8_t *ptr = (uint8_t *)dialog + fields[i].offset;
buf = skip_space(buf);
len = last ? strlen(buf) : strcspn(buf, ",");
if (len >= INT_MAX) {
ff_ass_free_dialog(&dialog);
return NULL;
}
convert_func[type](ptr, buf, len);
buf += len;
if (*buf) buf++;
}
return dialog;
}
void ff_ass_split_free(ASSSplitContext *ctx)
{
if (ctx) {
int i;
for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++) {
free_section(ctx, &ass_sections[i]);
av_freep(&(ctx->field_order[i]));
}
av_free(ctx);
}
}
int ff_ass_split_override_codes(const ASSCodesCallbacks *callbacks, void *priv,
const char *buf)
{
const char *text = NULL;
char new_line[2];
int text_len = 0;
while (buf && *buf) {
if (text && callbacks->text &&
(sscanf(buf, "\\%1[nN]", new_line) == 1 ||
!strncmp(buf, "{\\", 2))) {
callbacks->text(priv, text, text_len);
text = NULL;
}
if (sscanf(buf, "\\%1[nN]", new_line) == 1) {
if (callbacks->new_line)
callbacks->new_line(priv, new_line[0] == 'N');
buf += 2;
} else if (!strncmp(buf, "{\\", 2)) {
buf++;
while (*buf == '\\') {
char style[2], c[2], sep[2], c_num[2] = "0", tmp[128] = {0};
unsigned int color = 0xFFFFFFFF;
int len, size = -1, an = -1, alpha = -1;
int x1, y1, x2, y2, t1 = -1, t2 = -1;
if (sscanf(buf, "\\%1[bisu]%1[01\\}]%n", style, c, &len) > 1) {
int close = c[0] == '0' ? 1 : c[0] == '1' ? 0 : -1;
len += close != -1;
if (callbacks->style)
callbacks->style(priv, style[0], close);
} else if (sscanf(buf, "\\c%1[\\}]%n", sep, &len) > 0 ||
sscanf(buf, "\\c&H%X&%1[\\}]%n", &color, sep, &len) > 1 ||
sscanf(buf, "\\%1[1234]c%1[\\}]%n", c_num, sep, &len) > 1 ||
sscanf(buf, "\\%1[1234]c&H%X&%1[\\}]%n", c_num, &color, sep, &len) > 2) {
if (callbacks->color)
callbacks->color(priv, color, c_num[0] - '0');
} else if (sscanf(buf, "\\alpha%1[\\}]%n", sep, &len) > 0 ||
sscanf(buf, "\\alpha&H%2X&%1[\\}]%n", &alpha, sep, &len) > 1 ||
sscanf(buf, "\\%1[1234]a%1[\\}]%n", c_num, sep, &len) > 1 ||
sscanf(buf, "\\%1[1234]a&H%2X&%1[\\}]%n", c_num, &alpha, sep, &len) > 2) {
if (callbacks->alpha)
callbacks->alpha(priv, alpha, c_num[0] - '0');
} else if (sscanf(buf, "\\fn%1[\\}]%n", sep, &len) > 0 ||
sscanf(buf, "\\fn%127[^\\}]%1[\\}]%n", tmp, sep, &len) > 1) {
if (callbacks->font_name)
callbacks->font_name(priv, tmp[0] ? tmp : NULL);
} else if (sscanf(buf, "\\fs%1[\\}]%n", sep, &len) > 0 ||
sscanf(buf, "\\fs%u%1[\\}]%n", &size, sep, &len) > 1) {
if (callbacks->font_size)
callbacks->font_size(priv, size);
} else if (sscanf(buf, "\\a%1[\\}]%n", sep, &len) > 0 ||
sscanf(buf, "\\a%2u%1[\\}]%n", &an, sep, &len) > 1 ||
sscanf(buf, "\\an%1[\\}]%n", sep, &len) > 0 ||
sscanf(buf, "\\an%1u%1[\\}]%n", &an, sep, &len) > 1) {
if (an != -1 && buf[2] != 'n')
an = (an&3) + (an&4 ? 6 : an&8 ? 3 : 0);
if (callbacks->alignment)
callbacks->alignment(priv, an);
} else if (sscanf(buf, "\\r%1[\\}]%n", sep, &len) > 0 ||
sscanf(buf, "\\r%127[^\\}]%1[\\}]%n", tmp, sep, &len) > 1) {
if (callbacks->cancel_overrides)
callbacks->cancel_overrides(priv, tmp);
} else if (sscanf(buf, "\\move(%d,%d,%d,%d)%1[\\}]%n", &x1, &y1, &x2, &y2, sep, &len) > 4 ||
sscanf(buf, "\\move(%d,%d,%d,%d,%d,%d)%1[\\}]%n", &x1, &y1, &x2, &y2, &t1, &t2, sep, &len) > 6) {
if (callbacks->move)
callbacks->move(priv, x1, y1, x2, y2, t1, t2);
} else if (sscanf(buf, "\\pos(%d,%d)%1[\\}]%n", &x1, &y1, sep, &len) > 2) {
if (callbacks->move)
callbacks->move(priv, x1, y1, x1, y1, -1, -1);
} else if (sscanf(buf, "\\org(%d,%d)%1[\\}]%n", &x1, &y1, sep, &len) > 2) {
if (callbacks->origin)
callbacks->origin(priv, x1, y1);
} else {
len = strcspn(buf+1, "\\}") + 2; /* skip unknown code */
}
buf += len - 1;
}
if (*buf++ != '}')
return AVERROR_INVALIDDATA;
} else {
if (!text) {
text = buf;
text_len = 1;
} else
text_len++;
buf++;
}
}
if (text && callbacks->text)
callbacks->text(priv, text, text_len);
if (callbacks->end)
callbacks->end(priv);
return 0;
}
ASSStyle *ff_ass_style_get(ASSSplitContext *ctx, const char *style)
{
ASS *ass = &ctx->ass;
int i;
if (!style || !*style)
style = "Default";
for (i=0; i<ass->styles_count; i++)
if (ass->styles[i].name && !strcmp(ass->styles[i].name, style))
return ass->styles + i;
return NULL;
}
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