mirror of https://github.com/FFmpeg/FFmpeg.git
Aurelien Jacobs
14 years ago
parent
efc8c709c9
commit
8e43b6fed9
9 changed files with 947 additions and 5 deletions
@ -0,0 +1,468 @@ |
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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++) |
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free_section(ctx, &ass_sections[i]); |
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av_free(ctx); |
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} |
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} |
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int ff_ass_split_override_codes(const ASSCodesCallbacks *callbacks, void *priv, |
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const char *buf) |
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{ |
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const char *text = NULL; |
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char new_line[2]; |
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int text_len = 0; |
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while (*buf) { |
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if (text && callbacks->text && |
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(sscanf(buf, "\\%1[nN]", new_line) == 1 || |
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!strncmp(buf, "{\\", 2))) { |
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callbacks->text(priv, text, text_len); |
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text = NULL; |
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} |
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if (sscanf(buf, "\\%1[nN]", new_line) == 1) { |
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if (callbacks->new_line) |
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callbacks->new_line(priv, new_line[0] == 'N'); |
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buf += 2; |
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} else if (!strncmp(buf, "{\\", 2)) { |
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buf++; |
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while (*buf == '\\') { |
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char style[2], c[2], sep[2], c_num[2] = "0", tmp[128] = {0}; |
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unsigned int color = 0xFFFFFFFF; |
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int len, size = -1, an = -1, alpha = -1; |
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int x1, y1, x2, y2, t1 = -1, t2 = -1; |
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if (sscanf(buf, "\\%1[bisu]%1[01\\}]%n", style, c, &len) > 1) { |
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int close = c[0] == '0' ? 1 : c[0] == '1' ? 0 : -1; |
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len += close != -1; |
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if (callbacks->style) |
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callbacks->style(priv, style[0], close); |
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} else if (sscanf(buf, "\\c%1[\\}]%n", sep, &len) > 0 || |
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sscanf(buf, "\\c&H%X&%1[\\}]%n", &color, sep, &len) > 1 || |
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sscanf(buf, "\\%1[1234]c%1[\\}]%n", c_num, sep, &len) > 1 || |
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sscanf(buf, "\\%1[1234]c&H%X&%1[\\}]%n", c_num, &color, sep, &len) > 2) { |
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if (callbacks->color) |
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callbacks->color(priv, color, c_num[0] - '0'); |
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} else if (sscanf(buf, "\\alpha%1[\\}]%n", sep, &len) > 0 || |
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sscanf(buf, "\\alpha&H%2X&%1[\\}]%n", &alpha, sep, &len) > 1 || |
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sscanf(buf, "\\%1[1234]a%1[\\}]%n", c_num, sep, &len) > 1 || |
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sscanf(buf, "\\%1[1234]a&H%2X&%1[\\}]%n", c_num, &alpha, sep, &len) > 2) { |
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if (callbacks->alpha) |
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callbacks->alpha(priv, alpha, c_num[0] - '0'); |
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} else if (sscanf(buf, "\\fn%1[\\}]%n", sep, &len) > 0 || |
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sscanf(buf, "\\fn%127[^\\}]%1[\\}]%n", tmp, sep, &len) > 1) { |
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if (callbacks->font_name) |
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callbacks->font_name(priv, tmp[0] ? tmp : NULL); |
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} else if (sscanf(buf, "\\fs%1[\\}]%n", sep, &len) > 0 || |
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sscanf(buf, "\\fs%u%1[\\}]%n", &size, sep, &len) > 1) { |
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if (callbacks->font_size) |
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callbacks->font_size(priv, size); |
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} else if (sscanf(buf, "\\a%1[\\}]%n", sep, &len) > 0 || |
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sscanf(buf, "\\a%2u%1[\\}]%n", &an, sep, &len) > 1 || |
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sscanf(buf, "\\an%1[\\}]%n", sep, &len) > 0 || |
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sscanf(buf, "\\an%1u%1[\\}]%n", &an, sep, &len) > 1) { |
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if (an != -1 && buf[2] != 'n') |
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an = (an&3) + (an&4 ? 6 : an&8 ? 3 : 0); |
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if (callbacks->alignment) |
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callbacks->alignment(priv, an); |
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} else if (sscanf(buf, "\\r%1[\\}]%n", sep, &len) > 0 || |
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sscanf(buf, "\\r%127[^\\}]%1[\\}]%n", tmp, sep, &len) > 1) { |
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if (callbacks->cancel_overrides) |
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callbacks->cancel_overrides(priv, tmp); |
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} else if (sscanf(buf, "\\move(%d,%d,%d,%d)%1[\\}]%n", &x1, &y1, &x2, &y2, sep, &len) > 4 || |
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sscanf(buf, "\\move(%d,%d,%d,%d,%d,%d)%1[\\}]%n", &x1, &y1, &x2, &y2, &t1, &t2, sep, &len) > 6) { |
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if (callbacks->move) |
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callbacks->move(priv, x1, y1, x2, y2, t1, t2); |
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} else if (sscanf(buf, "\\pos(%d,%d)%1[\\}]%n", &x1, &y1, sep, &len) > 2) { |
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if (callbacks->move) |
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callbacks->move(priv, x1, y1, x1, y1, -1, -1); |
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} else if (sscanf(buf, "\\org(%d,%d)%1[\\}]%n", &x1, &y1, sep, &len) > 2) { |
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if (callbacks->origin) |
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callbacks->origin(priv, x1, y1); |
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} else { |
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len = strcspn(buf+1, "\\}") + 2; /* skip unknown code */ |
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} |
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buf += len - 1; |
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} |
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if (*buf++ != '}') |
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return AVERROR_INVALIDDATA; |
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} else { |
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if (!text) { |
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text = buf; |
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text_len = 1; |
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} else |
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text_len++; |
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buf++; |
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} |
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} |
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if (text && callbacks->text) |
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callbacks->text(priv, text, text_len); |
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if (callbacks->end) |
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callbacks->end(priv); |
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return 0; |
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} |
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ASSStyle *ass_style_get(ASSSplitContext *ctx, const char *style) |
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{ |
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ASS *ass = &ctx->ass; |
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int i; |
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if (!style || !*style) |
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style = "Default"; |
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for (i=0; i<ass->styles_count; i++) |
||||
if (!strcmp(ass->styles[i].name, style)) |
||||
return ass->styles + i; |
||||
return NULL; |
||||
} |
||||
@ -0,0 +1,172 @@ |
||||
/*
|
||||
* 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 |
||||
*/ |
||||
|
||||
#ifndef AVCODEC_ASS_SPLIT_H |
||||
#define AVCODEC_ASS_SPLIT_H |
||||
|
||||
/**
|
||||
* fields extracted from the [Script Info] section |
||||
*/ |
||||
typedef struct { |
||||
char *script_type; /**< SSA script format version (eg. v4.00) */ |
||||
char *collisions; /**< how subtitles are moved to prevent collisions */ |
||||
int play_res_x; /**< video width that ASS coords are referring to */ |
||||
int play_res_y; /**< video height that ASS coords are referring to */ |
||||
float timer; /**< time multiplier to apply to SSA clock (in %) */ |
||||
} ASSScriptInfo; |
||||
|
||||
/**
|
||||
* fields extracted from the [V4(+) Styles] section |
||||
*/ |
||||
typedef struct { |
||||
char *name; /**< name of the tyle (case sensitive) */ |
||||
char *font_name; /**< font face (case sensitive) */ |
||||
int font_size; /**< font height */ |
||||
int primary_color; /**< color that a subtitle will normally appear in */ |
||||
int back_color; /**< color of the subtitle outline or shadow */ |
||||
int bold; /**< whether text is bold (1) or not (0) */ |
||||
int italic; /**< whether text is italic (1) or not (0) */ |
||||
int underline; /**< whether text is underlined (1) or not (0) */ |
||||
int alignment; /**< position of the text (left, center, top...),
|
||||
defined after the layout of the numpad |
||||
(1-3 sub, 4-6 mid, 7-9 top) */ |
||||
} ASSStyle; |
||||
|
||||
/**
|
||||
* fields extracted from the [Events] section |
||||
*/ |
||||
typedef struct { |
||||
int layer; /**< higher numbered layers are drawn over lower numbered */ |
||||
int start; /**< start time of the dialog in centiseconds */ |
||||
int end; /**< end time of the dialog in centiseconds */ |
||||
char *style; /**< name of the ASSStyle to use with this dialog */ |
||||
char *text; /**< actual text which will be displayed as a subtitle,
|
||||
can include style override control codes (see |
||||
ff_ass_split_override_codes()) */ |
||||
} ASSDialog; |
||||
|
||||
/**
|
||||
* structure containing the whole split ASS data |
||||
*/ |
||||
typedef struct { |
||||
ASSScriptInfo script_info; /**< general information about the SSA script*/ |
||||
ASSStyle *styles; /**< array of split out styles */ |
||||
int styles_count; /**< number of ASSStyle in the styles array */ |
||||
ASSDialog *dialogs; /**< array of split out dialogs */ |
||||
int dialogs_count; /**< number of ASSDialog in the dialogs array*/ |
||||
} ASS; |
||||
|
||||
/**
|
||||
* This struct can be casted to ASS to access to the split data. |
||||
*/ |
||||
typedef struct ASSSplitContext ASSSplitContext; |
||||
|
||||
/**
|
||||
* Split a full ASS file or a ASS header from a string buffer and store |
||||
* the split structure in a newly allocated context. |
||||
* |
||||
* @param buf String containing the ASS formated data. |
||||
* @return Newly allocated struct containing split data. |
||||
*/ |
||||
ASSSplitContext *ff_ass_split(const char *buf); |
||||
|
||||
/**
|
||||
* Split one or several ASS "Dialogue" lines from a string buffer and store |
||||
* them in a already initialized context. |
||||
* |
||||
* @param ctx Context previously initialized by ff_ass_split(). |
||||
* @param buf String containing the ASS "Dialogue" lines. |
||||
* @param cache Set to 1 to keep all the previously split ASSDialog in |
||||
* the context, or set to 0 to free all the previously split |
||||
* ASSDialog. |
||||
* @param number If not NULL, the pointed integer will be set to the number |
||||
* of split ASSDialog. |
||||
* @return Pointer to the first split ASSDialog. |
||||
*/ |
||||
ASSDialog *ff_ass_split_dialog(ASSSplitContext *ctx, const char *buf, |
||||
int cache, int *number); |
||||
|
||||
/**
|
||||
* Free all the memory allocated for an ASSSplitContext. |
||||
* |
||||
* @param ctx Context previously initialized by ff_ass_split(). |
||||
*/ |
||||
void ff_ass_split_free(ASSSplitContext *ctx); |
||||
|
||||
|
||||
/**
|
||||
* Set of callback functions corresponding to each override codes that can |
||||
* be encountered in a "Dialogue" Text field. |
||||
*/ |
||||
typedef struct { |
||||
/**
|
||||
* @defgroup ass_styles ASS styles |
||||
* @{ |
||||
*/ |
||||
void (*text)(void *priv, const char *text, int len); |
||||
void (*new_line)(void *priv, int forced); |
||||
void (*style)(void *priv, char style, int close); |
||||
void (*color)(void *priv, unsigned int color, unsigned int color_id); |
||||
void (*alpha)(void *priv, int alpha, int alpha_id); |
||||
void (*font_name)(void *priv, const char *name); |
||||
void (*font_size)(void *priv, int size); |
||||
void (*alignment)(void *priv, int alignment); |
||||
void (*cancel_overrides)(void *priv, const char *style); |
||||
/**< @} */ |
||||
|
||||
/**
|
||||
* @defgroup ass_functions ASS functions |
||||
* @{ |
||||
*/ |
||||
void (*move)(void *priv, int x1, int y1, int x2, int y2, int t1, int t2); |
||||
void (*origin)(void *priv, int x, int y); |
||||
/**< @} */ |
||||
|
||||
/**
|
||||
* @defgroup ass_end end of Dialogue Event |
||||
* @{ |
||||
*/ |
||||
void (*end)(void *priv); |
||||
/**< @} */ |
||||
} ASSCodesCallbacks; |
||||
|
||||
/**
|
||||
* Split override codes out of a ASS "Dialogue" Text field. |
||||
* |
||||
* @param callbacks Set of callback functions called for each override code |
||||
* encountered. |
||||
* @param priv Opaque pointer passed to the callback functions. |
||||
* @param buf The ASS "Dialogue" Text field to split. |
||||
* @return >= 0 on success otherwise an error code <0 |
||||
*/ |
||||
int ff_ass_split_override_codes(const ASSCodesCallbacks *callbacks, void *priv, |
||||
const char *buf); |
||||
|
||||
/**
|
||||
* Find an ASSStyle structure by its name. |
||||
* |
||||
* @param ctx Context previously initialized by ff_ass_split(). |
||||
* @param style name of the style to search for. |
||||
* @return the ASSStyle corresponding to style, or NULL if style can't be found |
||||
*/ |
||||
ASSStyle *ass_style_get(ASSSplitContext *ctx, const char *style); |
||||
|
||||
#endif /* AVCODEC_ASS_SPLIT_H */ |
||||
@ -0,0 +1,301 @@ |
||||
/*
|
||||
* SubRip subtitle encoder |
||||
* 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 <stdarg.h> |
||||
#include "avcodec.h" |
||||
#include "libavutil/avstring.h" |
||||
#include "ass_split.h" |
||||
#include "ass.h" |
||||
|
||||
|
||||
#define SRT_STACK_SIZE 64 |
||||
|
||||
typedef struct { |
||||
AVCodecContext *avctx; |
||||
ASSSplitContext *ass_ctx; |
||||
char buffer[2048]; |
||||
char *ptr; |
||||
char *end; |
||||
char *dialog_start; |
||||
int count; |
||||
char stack[SRT_STACK_SIZE]; |
||||
int stack_ptr; |
||||
int alignment_applied; |
||||
} SRTContext; |
||||
|
||||
|
||||
#ifdef __GNUC__ |
||||
__attribute__ ((__format__ (__printf__, 2, 3))) |
||||
#endif |
||||
static void srt_print(SRTContext *s, const char *str, ...) |
||||
{ |
||||
va_list vargs; |
||||
va_start(vargs, str); |
||||
s->ptr += vsnprintf(s->ptr, s->end - s->ptr, str, vargs); |
||||
va_end(vargs); |
||||
} |
||||
|
||||
static int srt_stack_push(SRTContext *s, const char c) |
||||
{ |
||||
if (s->stack_ptr >= SRT_STACK_SIZE) |
||||
return -1; |
||||
s->stack[s->stack_ptr++] = c; |
||||
return 0; |
||||
} |
||||
|
||||
static char srt_stack_pop(SRTContext *s) |
||||
{ |
||||
if (s->stack_ptr <= 0) |
||||
return 0; |
||||
return s->stack[--s->stack_ptr]; |
||||
} |
||||
|
||||
static int srt_stack_find(SRTContext *s, const char c) |
||||
{ |
||||
int i; |
||||
for (i = s->stack_ptr-1; i >= 0; i--) |
||||
if (s->stack[i] == c) |
||||
break; |
||||
return i; |
||||
} |
||||
|
||||
static void srt_close_tag(SRTContext *s, char tag) |
||||
{ |
||||
srt_print(s, "</%c%s>", tag, tag == 'f' ? "ont" : ""); |
||||
} |
||||
|
||||
static void srt_stack_push_pop(SRTContext *s, const char c, int close) |
||||
{ |
||||
if (close) { |
||||
int i = c ? srt_stack_find(s, c) : 0; |
||||
if (i < 0) |
||||
return; |
||||
while (s->stack_ptr != i) |
||||
srt_close_tag(s, srt_stack_pop(s)); |
||||
} else if (srt_stack_push(s, c) < 0) |
||||
av_log(s->avctx, AV_LOG_ERROR, "tag stack overflow\n"); |
||||
} |
||||
|
||||
static void srt_style_apply(SRTContext *s, const char *style) |
||||
{ |
||||
ASSStyle *st = ass_style_get(s->ass_ctx, style); |
||||
if (st) { |
||||
int c = st->primary_color & 0xFFFFFF; |
||||
if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT) || |
||||
st->font_size != ASS_DEFAULT_FONT_SIZE || |
||||
c != ASS_DEFAULT_COLOR) { |
||||
srt_print(s, "<font"); |
||||
if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT)) |
||||
srt_print(s, " face=\"%s\"", st->font_name); |
||||
if (st->font_size != ASS_DEFAULT_FONT_SIZE) |
||||
srt_print(s, " size=\"%d\"", st->font_size); |
||||
if (c != ASS_DEFAULT_COLOR) |
||||
srt_print(s, " color=\"#%06x\"", |
||||
(c & 0xFF0000) >> 16 | c & 0xFF00 | (c & 0xFF) << 16); |
||||
srt_print(s, ">"); |
||||
srt_stack_push(s, 'f'); |
||||
} |
||||
if (st->bold != ASS_DEFAULT_BOLD) { |
||||
srt_print(s, "<b>"); |
||||
srt_stack_push(s, 'b'); |
||||
} |
||||
if (st->italic != ASS_DEFAULT_ITALIC) { |
||||
srt_print(s, "<i>"); |
||||
srt_stack_push(s, 'i'); |
||||
} |
||||
if (st->underline != ASS_DEFAULT_UNDERLINE) { |
||||
srt_print(s, "<u>"); |
||||
srt_stack_push(s, 'u'); |
||||
} |
||||
if (st->alignment != ASS_DEFAULT_ALIGNMENT) { |
||||
srt_print(s, "{\\an%d}", st->alignment); |
||||
s->alignment_applied = 1; |
||||
} |
||||
} |
||||
} |
||||
|
||||
|
||||
static av_cold int srt_encode_init(AVCodecContext *avctx) |
||||
{ |
||||
SRTContext *s = avctx->priv_data; |
||||
s->avctx = avctx; |
||||
s->ass_ctx = ff_ass_split(avctx->subtitle_header); |
||||
return s->ass_ctx ? 0 : AVERROR_INVALIDDATA; |
||||
} |
||||
|
||||
static void srt_text_cb(void *priv, const char *text, int len) |
||||
{ |
||||
SRTContext *s = priv; |
||||
av_strlcpy(s->ptr, text, FFMIN(s->end-s->ptr, len+1)); |
||||
s->ptr += len; |
||||
} |
||||
|
||||
static void srt_new_line_cb(void *priv, int forced) |
||||
{ |
||||
srt_print(priv, "\r\n"); |
||||
} |
||||
|
||||
static void srt_style_cb(void *priv, char style, int close) |
||||
{ |
||||
srt_stack_push_pop(priv, style, close); |
||||
if (!close) |
||||
srt_print(priv, "<%c>", style); |
||||
} |
||||
|
||||
static void srt_color_cb(void *priv, unsigned int color, unsigned int color_id) |
||||
{ |
||||
if (color_id > 1) |
||||
return; |
||||
srt_stack_push_pop(priv, 'f', color == 0xFFFFFFFF); |
||||
if (color != 0xFFFFFFFF) |
||||
srt_print(priv, "<font color=\"#%06x\">", |
||||
(color & 0xFF0000) >> 16 | color & 0xFF00 | (color & 0xFF) << 16); |
||||
} |
||||
|
||||
static void srt_font_name_cb(void *priv, const char *name) |
||||
{ |
||||
srt_stack_push_pop(priv, 'f', !name); |
||||
if (name) |
||||
srt_print(priv, "<font face=\"%s\">", name); |
||||
} |
||||
|
||||
static void srt_font_size_cb(void *priv, int size) |
||||
{ |
||||
srt_stack_push_pop(priv, 'f', size < 0); |
||||
if (size >= 0) |
||||
srt_print(priv, "<font size=\"%d\">", size); |
||||
} |
||||
|
||||
static void srt_alignment_cb(void *priv, int alignment) |
||||
{ |
||||
SRTContext *s = priv; |
||||
if (!s->alignment_applied && alignment >= 0) { |
||||
srt_print(s, "{\\an%d}", alignment); |
||||
s->alignment_applied = 1; |
||||
} |
||||
} |
||||
|
||||
static void srt_cancel_overrides_cb(void *priv, const char *style) |
||||
{ |
||||
srt_stack_push_pop(priv, 0, 1); |
||||
srt_style_apply(priv, style); |
||||
} |
||||
|
||||
static void srt_move_cb(void *priv, int x1, int y1, int x2, int y2, |
||||
int t1, int t2) |
||||
{ |
||||
SRTContext *s = priv; |
||||
char buffer[32]; |
||||
int len = snprintf(buffer, sizeof(buffer), |
||||
" X1:%03u X2:%03u Y1:%03u Y2:%03u", x1, x2, y1, y2); |
||||
if (s->end - s->ptr > len) { |
||||
memmove(s->dialog_start+len, s->dialog_start, s->ptr-s->dialog_start+1); |
||||
memcpy(s->dialog_start, buffer, len); |
||||
s->ptr += len; |
||||
} |
||||
} |
||||
|
||||
static void srt_end_cb(void *priv) |
||||
{ |
||||
srt_stack_push_pop(priv, 0, 1); |
||||
srt_print(priv, "\r\n\r\n"); |
||||
} |
||||
|
||||
static const ASSCodesCallbacks srt_callbacks = { |
||||
.text = srt_text_cb, |
||||
.new_line = srt_new_line_cb, |
||||
.style = srt_style_cb, |
||||
.color = srt_color_cb, |
||||
.font_name = srt_font_name_cb, |
||||
.font_size = srt_font_size_cb, |
||||
.alignment = srt_alignment_cb, |
||||
.cancel_overrides = srt_cancel_overrides_cb, |
||||
.move = srt_move_cb, |
||||
.end = srt_end_cb, |
||||
}; |
||||
|
||||
static int srt_encode_frame(AVCodecContext *avctx, |
||||
unsigned char *buf, int bufsize, void *data) |
||||
{ |
||||
SRTContext *s = avctx->priv_data; |
||||
AVSubtitle *sub = data; |
||||
ASSDialog *dialog; |
||||
int i, len, num; |
||||
|
||||
s->ptr = s->buffer; |
||||
s->end = s->ptr + sizeof(s->buffer); |
||||
|
||||
for (i=0; i<sub->num_rects; i++) { |
||||
|
||||
if (sub->rects[i]->type != SUBTITLE_ASS) { |
||||
av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n"); |
||||
return AVERROR(ENOSYS); |
||||
} |
||||
|
||||
dialog = ff_ass_split_dialog(s->ass_ctx, sub->rects[i]->ass, 0, &num); |
||||
for (; dialog && num--; dialog++) { |
||||
int sh, sm, ss, sc = 10 * dialog->start; |
||||
int eh, em, es, ec = 10 * dialog->end; |
||||
sh = sc/3600000; sc -= 3600000*sh; |
||||
sm = sc/ 60000; sc -= 60000*sm; |
||||
ss = sc/ 1000; sc -= 1000*ss; |
||||
eh = ec/3600000; ec -= 3600000*eh; |
||||
em = ec/ 60000; ec -= 60000*em; |
||||
es = ec/ 1000; ec -= 1000*es; |
||||
srt_print(s,"%d\r\n%02d:%02d:%02d,%03d --> %02d:%02d:%02d,%03d\r\n", |
||||
++s->count, sh, sm, ss, sc, eh, em, es, ec); |
||||
s->alignment_applied = 0; |
||||
s->dialog_start = s->ptr - 2; |
||||
srt_style_apply(s, dialog->style); |
||||
ff_ass_split_override_codes(&srt_callbacks, s, dialog->text); |
||||
} |
||||
} |
||||
|
||||
if (s->ptr == s->buffer) |
||||
return 0; |
||||
|
||||
len = av_strlcpy(buf, s->buffer, bufsize); |
||||
|
||||
if (len > bufsize-1) { |
||||
av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n"); |
||||
return -1; |
||||
} |
||||
|
||||
return len; |
||||
} |
||||
|
||||
static int srt_encode_close(AVCodecContext *avctx) |
||||
{ |
||||
SRTContext *s = avctx->priv_data; |
||||
ff_ass_split_free(s->ass_ctx); |
||||
return 0; |
||||
} |
||||
|
||||
AVCodec ff_srt_encoder = { |
||||
.name = "srt", |
||||
.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
||||
.type = AVMEDIA_TYPE_SUBTITLE, |
||||
.id = CODEC_ID_SRT, |
||||
.priv_data_size = sizeof(SRTContext), |
||||
.init = srt_encode_init, |
||||
.encode = srt_encode_frame, |
||||
.close = srt_encode_close, |
||||
}; |
||||
Loading…
Reference in new issue