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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[10];
} 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)},
{"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) },
{"Alignment", ASS_INT, offsetof(ASSStyle, alignment) },
{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)},
{"BackColour", ASS_COLOR,offsetof(ASSStyle, back_color) },
{"Bold", ASS_INT, offsetof(ASSStyle, bold) },
{"Italic", ASS_INT, offsetof(ASSStyle, italic) },
{"Alignment", ASS_ALGN, offsetof(ASSStyle, alignment) },
{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) },
{"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(*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 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 *tmp, i, len;
while (buf && *buf) {
if (buf[0] == '[') {
ctx->current_section = -1;
break;
}
if (buf[0] == ';' || (buf[0] == '!' && buf[1] == ':')) {
/* skip comments */
} else if (section->format_header && !order) {
len = strlen(section->format_header);
if (strncmp(buf, section->format_header, len) || buf[len] != ':')
return NULL;
buf += len + 1;
while (!is_eol(*buf)) {
buf = skip_space(buf);
len = strcspn(buf, ", \r\n");
if (!(tmp = av_realloc(order, (*number + 1) * sizeof(*order))))
return NULL;
order = tmp;
order[*number] = -1;
for (i=0; section->fields[i].name; i++)
if (!strncmp(buf, section->fields[i].name, len)) {
order[*number] = i;
break;
}
(*number)++; |
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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;
}
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