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FFmpeg/libavcodec/ass_split.c
Philip Langdale 50b4dbf65a ass subtitles: Fix valgrind warnings. 
We're now running some of this code through valgrind for the first
time, and a few warnings showed up stemming from two problems.

1) The ASS code assumes the subtitle header is null terminated, but
it wasn't, and passing the size down doesn't look like fun, so I
added a terminator

2) The code wasn't freeing all of its state.

Signed-off-by: Philip Langdale <philipl@overt.org>
2012-08-05 09:11:11 -07:00

471 lines
17 KiB
C
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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)++;
buf = skip_space(buf + len + (buf[len] == ','));
}
ctx->field_order[ctx->current_section] = order;
} else 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;
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 = skip_space(buf + len + !last);
}
}
} 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;
}
}
}
buf += strcspn(buf, "\n") + 1;
}
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") + 1;
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") + 1;
}
return buf ? 0 : AVERROR_INVALIDDATA;
}
ASSSplitContext *ff_ass_split(const char *buf)
{
ASSSplitContext *ctx = av_mallocz(sizeof(*ctx));
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_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) {
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 *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 (!strcmp(ass->styles[i].name, style))
return ass->styles + i;
return NULL;
}
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