mirror of https://git.ffmpeg.org/ffmpeg.git
469 lines
17 KiB
C
469 lines
17 KiB
C
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/*
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* SSA/ASS spliting functions
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* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "ass_split.h"
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typedef enum {
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ASS_STR,
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ASS_INT,
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ASS_FLT,
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ASS_COLOR,
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ASS_TIMESTAMP,
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ASS_ALGN,
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} ASSFieldType;
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typedef struct {
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const char *name;
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int type;
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int offset;
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} ASSFields;
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typedef struct {
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const char *section;
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const char *format_header;
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const char *fields_header;
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int size;
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int offset;
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int offset_count;
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ASSFields fields[10];
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} ASSSection;
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static const ASSSection ass_sections[] = {
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{ .section = "Script Info",
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.offset = offsetof(ASS, script_info),
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.fields = {{"ScriptType", ASS_STR, offsetof(ASSScriptInfo, script_type)},
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{"Collisions", ASS_STR, offsetof(ASSScriptInfo, collisions) },
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{"PlayResX", ASS_INT, offsetof(ASSScriptInfo, play_res_x) },
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{"PlayResY", ASS_INT, offsetof(ASSScriptInfo, play_res_y) },
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{"Timer", ASS_FLT, offsetof(ASSScriptInfo, timer) },
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{0},
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}
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},
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{ .section = "V4+ Styles",
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.format_header = "Format",
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.fields_header = "Style",
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.size = sizeof(ASSStyle),
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.offset = offsetof(ASS, styles),
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.offset_count = offsetof(ASS, styles_count),
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.fields = {{"Name", ASS_STR, offsetof(ASSStyle, name) },
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{"Fontname", ASS_STR, offsetof(ASSStyle, font_name) },
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{"Fontsize", ASS_INT, offsetof(ASSStyle, font_size) },
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{"PrimaryColour",ASS_COLOR,offsetof(ASSStyle, primary_color)},
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{"BackColour", ASS_COLOR,offsetof(ASSStyle, back_color) },
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{"Bold", ASS_INT, offsetof(ASSStyle, bold) },
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{"Italic", ASS_INT, offsetof(ASSStyle, italic) },
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{"Underline", ASS_INT, offsetof(ASSStyle, underline) },
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{"Alignment", ASS_INT, offsetof(ASSStyle, alignment) },
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{0},
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}
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},
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{ .section = "V4 Styles",
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.format_header = "Format",
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.fields_header = "Style",
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.size = sizeof(ASSStyle),
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.offset = offsetof(ASS, styles),
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.offset_count = offsetof(ASS, styles_count),
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.fields = {{"Name", ASS_STR, offsetof(ASSStyle, name) },
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{"Fontname", ASS_STR, offsetof(ASSStyle, font_name) },
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{"Fontsize", ASS_INT, offsetof(ASSStyle, font_size) },
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{"PrimaryColour",ASS_COLOR,offsetof(ASSStyle, primary_color)},
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{"BackColour", ASS_COLOR,offsetof(ASSStyle, back_color) },
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{"Bold", ASS_INT, offsetof(ASSStyle, bold) },
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{"Italic", ASS_INT, offsetof(ASSStyle, italic) },
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{"Alignment", ASS_ALGN, offsetof(ASSStyle, alignment) },
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{0},
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}
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},
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{ .section = "Events",
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.format_header = "Format",
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.fields_header = "Dialogue",
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.size = sizeof(ASSDialog),
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.offset = offsetof(ASS, dialogs),
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.offset_count = offsetof(ASS, dialogs_count),
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.fields = {{"Layer", ASS_INT, offsetof(ASSDialog, layer) },
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{"Start", ASS_TIMESTAMP, offsetof(ASSDialog, start) },
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{"End", ASS_TIMESTAMP, offsetof(ASSDialog, end) },
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{"Style", ASS_STR, offsetof(ASSDialog, style) },
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{"Text", ASS_STR, offsetof(ASSDialog, text) },
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{0},
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}
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},
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};
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typedef int (*ASSConvertFunc)(void *dest, const char *buf, int len);
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static int convert_str(void *dest, const char *buf, int len)
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{
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char *str = av_malloc(len + 1);
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if (str) {
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memcpy(str, buf, len);
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str[len] = 0;
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if (*(void **)dest)
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av_free(*(void **)dest);
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*(char **)dest = str;
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}
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return !str;
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}
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static int convert_int(void *dest, const char *buf, int len)
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{
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return sscanf(buf, "%d", (int *)dest) == 1;
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}
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static int convert_flt(void *dest, const char *buf, int len)
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{
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return sscanf(buf, "%f", (float *)dest) == 1;
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}
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static int convert_color(void *dest, const char *buf, int len)
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{
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return sscanf(buf, "&H%8x", (int *)dest) == 1 ||
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sscanf(buf, "%d", (int *)dest) == 1;
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}
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static int convert_timestamp(void *dest, const char *buf, int len)
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{
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int c, h, m, s, cs;
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if ((c = sscanf(buf, "%d:%02d:%02d.%02d", &h, &m, &s, &cs)) == 4)
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*(int *)dest = 360000*h + 6000*m + 100*s + cs;
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return c == 4;
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}
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static int convert_alignment(void *dest, const char *buf, int len)
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{
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int a;
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if (sscanf(buf, "%d", &a) == 1) {
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/* convert V4 Style alignment to V4+ Style */
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*(int *)dest = a + ((a&4) >> 1) - 5*!!(a&8);
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return 1;
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}
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return 0;
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}
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static const ASSConvertFunc convert_func[] = {
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[ASS_STR] = convert_str,
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[ASS_INT] = convert_int,
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[ASS_FLT] = convert_flt,
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[ASS_COLOR] = convert_color,
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[ASS_TIMESTAMP] = convert_timestamp,
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[ASS_ALGN] = convert_alignment,
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};
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struct ASSSplitContext {
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ASS ass;
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int current_section;
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int field_number[FF_ARRAY_ELEMS(ass_sections)];
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int *field_order[FF_ARRAY_ELEMS(ass_sections)];
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};
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static uint8_t *realloc_section_array(ASSSplitContext *ctx)
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{
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const ASSSection *section = &ass_sections[ctx->current_section];
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int *count = (int *)((uint8_t *)&ctx->ass + section->offset_count);
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void **section_ptr = (void **)((uint8_t *)&ctx->ass + section->offset);
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uint8_t *tmp = av_realloc(*section_ptr, (*count+1)*section->size);
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if (!tmp)
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return NULL;
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*section_ptr = tmp;
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tmp += *count * section->size;
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memset(tmp, 0, section->size);
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(*count)++;
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return tmp;
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}
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static inline int is_eol(char buf)
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{
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return buf == '\r' || buf == '\n' || buf == 0;
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}
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static inline const char *skip_space(const char *buf)
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{
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while (*buf == ' ')
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buf++;
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return buf;
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}
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static const char *ass_split_section(ASSSplitContext *ctx, const char *buf)
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{
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const ASSSection *section = &ass_sections[ctx->current_section];
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int *number = &ctx->field_number[ctx->current_section];
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int *order = ctx->field_order[ctx->current_section];
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int *tmp, i, len;
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while (buf && *buf) {
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if (buf[0] == '[') {
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ctx->current_section = -1;
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break;
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}
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if (buf[0] == ';' || (buf[0] == '!' && buf[1] == ':')) {
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/* skip comments */
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} else if (section->format_header && !order) {
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len = strlen(section->format_header);
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if (strncmp(buf, section->format_header, len) || buf[len] != ':')
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return NULL;
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buf += len + 1;
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while (!is_eol(*buf)) {
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buf = skip_space(buf);
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len = strcspn(buf, ", \r\n");
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if (!(tmp = av_realloc(order, (*number + 1) * sizeof(*order))))
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return NULL;
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order = tmp;
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order[*number] = -1;
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for (i=0; section->fields[i].name; i++)
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if (!strncmp(buf, section->fields[i].name, len)) {
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order[*number] = i;
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break;
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}
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(*number)++;
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buf = skip_space(buf + len + 1);
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}
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ctx->field_order[ctx->current_section] = order;
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} else if (section->fields_header) {
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len = strlen(section->fields_header);
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if (!strncmp(buf, section->fields_header, len) && buf[len] == ':') {
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uint8_t *ptr, *struct_ptr = realloc_section_array(ctx);
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if (!struct_ptr) return NULL;
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buf += len + 1;
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for (i=0; !is_eol(*buf) && i < *number; i++) {
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int last = i == *number - 1;
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buf = skip_space(buf);
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len = strcspn(buf, last ? "\r\n" : ",\r\n");
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if (order[i] >= 0) {
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ASSFieldType type = section->fields[order[i]].type;
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ptr = struct_ptr + section->fields[order[i]].offset;
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convert_func[type](ptr, buf, len);
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}
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buf = skip_space(buf + len + !last);
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}
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}
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} else {
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len = strcspn(buf, ":\r\n");
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if (buf[len] == ':') {
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for (i=0; section->fields[i].name; i++)
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if (!strncmp(buf, section->fields[i].name, len)) {
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ASSFieldType type = section->fields[i].type;
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uint8_t *ptr = (uint8_t *)&ctx->ass + section->offset;
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ptr += section->fields[i].offset;
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buf = skip_space(buf + len + 1);
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convert_func[type](ptr, buf, strcspn(buf, "\r\n"));
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break;
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}
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}
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}
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buf += strcspn(buf, "\n") + 1;
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}
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return buf;
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}
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static int ass_split(ASSSplitContext *ctx, const char *buf)
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{
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char c, section[16];
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int i;
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if (ctx->current_section >= 0)
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buf = ass_split_section(ctx, buf);
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while (buf && *buf) {
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if (sscanf(buf, "[%15[0-9A-Za-z+ ]]%c", section, &c) == 2) {
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buf += strcspn(buf, "\n") + 1;
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for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++)
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if (!strcmp(section, ass_sections[i].section)) {
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ctx->current_section = i;
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buf = ass_split_section(ctx, buf);
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}
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} else
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buf += strcspn(buf, "\n") + 1;
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}
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return buf ? 0 : AVERROR_INVALIDDATA;
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}
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ASSSplitContext *ff_ass_split(const char *buf)
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{
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ASSSplitContext *ctx = av_mallocz(sizeof(*ctx));
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ctx->current_section = -1;
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if (ass_split(ctx, buf) < 0) {
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ff_ass_split_free(ctx);
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return NULL;
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}
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return ctx;
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}
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static void free_section(ASSSplitContext *ctx, const ASSSection *section)
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{
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uint8_t *ptr = (uint8_t *)&ctx->ass + section->offset;
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int i, j, *count, c = 1;
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if (section->format_header) {
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ptr = *(void **)ptr;
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count = (int *)((uint8_t *)&ctx->ass + section->offset_count);
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} else
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count = &c;
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if (ptr)
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for (i=0; i<*count; i++, ptr += section->size)
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for (j=0; section->fields[j].name; j++) {
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const ASSFields *field = §ion->fields[j];
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if (field->type == ASS_STR)
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av_freep(ptr + field->offset);
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}
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*count = 0;
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if (section->format_header)
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av_freep((uint8_t *)&ctx->ass + section->offset);
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}
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ASSDialog *ff_ass_split_dialog(ASSSplitContext *ctx, const char *buf,
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int cache, int *number)
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{
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ASSDialog *dialog = NULL;
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int i, count;
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if (!cache)
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for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++)
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if (!strcmp(ass_sections[i].section, "Events")) {
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free_section(ctx, &ass_sections[i]);
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break;
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}
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count = ctx->ass.dialogs_count;
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if (ass_split(ctx, buf) == 0)
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dialog = ctx->ass.dialogs + count;
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if (number)
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*number = ctx->ass.dialogs_count - count;
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return dialog;
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}
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void ff_ass_split_free(ASSSplitContext *ctx)
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{
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if (ctx) {
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int i;
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for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++)
|
||
|
|
free_section(ctx, &ass_sections[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;
|
||
|
|
}
|