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/* |
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* SubRip subtitle encoder |
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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 <stdarg.h> |
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#include "avcodec.h" |
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#include "libavutil/avstring.h" |
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#include "libavutil/bprint.h" |
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#include "ass_split.h" |
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#include "ass.h" |
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#define SRT_STACK_SIZE 64 |
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typedef struct { |
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AVCodecContext *avctx; |
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ASSSplitContext *ass_ctx; |
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AVBPrint buffer; |
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char stack[SRT_STACK_SIZE]; |
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int stack_ptr; |
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int alignment_applied; |
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} SRTContext; |
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#ifdef __GNUC__ |
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__attribute__ ((__format__ (__printf__, 2, 3))) |
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#endif |
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static void srt_print(SRTContext *s, const char *str, ...) |
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{ |
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va_list vargs; |
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va_start(vargs, str); |
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av_vbprintf(&s->buffer, str, vargs); |
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va_end(vargs); |
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} |
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static int srt_stack_push(SRTContext *s, const char c) |
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{ |
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✗✓ |
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if (s->stack_ptr >= SRT_STACK_SIZE) |
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return -1; |
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s->stack[s->stack_ptr++] = c; |
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return 0; |
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} |
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static char srt_stack_pop(SRTContext *s) |
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{ |
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✗✓ |
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if (s->stack_ptr <= 0) |
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return 0; |
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return s->stack[--s->stack_ptr]; |
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} |
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static int srt_stack_find(SRTContext *s, const char c) |
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{ |
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int i; |
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for (i = s->stack_ptr-1; i >= 0; i--) |
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if (s->stack[i] == c) |
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break; |
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return i; |
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} |
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static void srt_close_tag(SRTContext *s, char tag) |
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{ |
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✓✗ |
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srt_print(s, "</%c%s>", tag, tag == 'f' ? "ont" : ""); |
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} |
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static void srt_stack_push_pop(SRTContext *s, const char c, int close) |
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{ |
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✓✗ |
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if (close) { |
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✗✓ |
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int i = c ? srt_stack_find(s, c) : 0; |
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✗✓ |
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if (i < 0) |
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return; |
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✓✓ |
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while (s->stack_ptr != i) |
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srt_close_tag(s, srt_stack_pop(s)); |
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} else if (srt_stack_push(s, c) < 0) |
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av_log(s->avctx, AV_LOG_ERROR, "tag stack overflow\n"); |
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} |
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static void srt_style_apply(SRTContext *s, const char *style) |
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{ |
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ASSStyle *st = ff_ass_style_get(s->ass_ctx, style); |
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✓✗ |
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if (st) { |
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int c = st->primary_color & 0xFFFFFF; |
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✓✗✗✓
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if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT) || |
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st->font_size != ASS_DEFAULT_FONT_SIZE || |
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c != ASS_DEFAULT_COLOR) { |
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srt_print(s, "<font"); |
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✓✗✓✗
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if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT)) |
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srt_print(s, " face=\"%s\"", st->font_name); |
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✓✗ |
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if (st->font_size != ASS_DEFAULT_FONT_SIZE) |
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srt_print(s, " size=\"%d\"", st->font_size); |
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✗✓ |
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if (c != ASS_DEFAULT_COLOR) |
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srt_print(s, " color=\"#%06x\"", |
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(c & 0xFF0000) >> 16 | c & 0xFF00 | (c & 0xFF) << 16); |
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srt_print(s, ">"); |
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srt_stack_push(s, 'f'); |
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} |
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✗✓ |
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if (st->bold != ASS_DEFAULT_BOLD) { |
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srt_print(s, "<b>"); |
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srt_stack_push(s, 'b'); |
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} |
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✗✓ |
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if (st->italic != ASS_DEFAULT_ITALIC) { |
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srt_print(s, "<i>"); |
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srt_stack_push(s, 'i'); |
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} |
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✗✓ |
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if (st->underline != ASS_DEFAULT_UNDERLINE) { |
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srt_print(s, "<u>"); |
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srt_stack_push(s, 'u'); |
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} |
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✗✓ |
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if (st->alignment != ASS_DEFAULT_ALIGNMENT) { |
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srt_print(s, "{\\an%d}", st->alignment); |
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s->alignment_applied = 1; |
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} |
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} |
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} |
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static av_cold int srt_encode_init(AVCodecContext *avctx) |
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{ |
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SRTContext *s = avctx->priv_data; |
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s->avctx = avctx; |
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s->ass_ctx = ff_ass_split(avctx->subtitle_header); |
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av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED); |
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✓✗ |
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return s->ass_ctx ? 0 : AVERROR_INVALIDDATA; |
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} |
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static void srt_text_cb(void *priv, const char *text, int len) |
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{ |
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SRTContext *s = priv; |
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av_bprint_append_data(&s->buffer, text, len); |
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} |
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static void srt_new_line_cb(void *priv, int forced) |
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{ |
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srt_print(priv, "\r\n"); |
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} |
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static void srt_style_cb(void *priv, char style, int close) |
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{ |
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srt_stack_push_pop(priv, style, close); |
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if (!close) |
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srt_print(priv, "<%c>", style); |
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} |
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static void srt_color_cb(void *priv, unsigned int color, unsigned int color_id) |
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{ |
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if (color_id > 1) |
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return; |
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srt_stack_push_pop(priv, 'f', color == 0xFFFFFFFF); |
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if (color != 0xFFFFFFFF) |
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srt_print(priv, "<font color=\"#%06x\">", |
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(color & 0xFF0000) >> 16 | color & 0xFF00 | (color & 0xFF) << 16); |
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} |
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static void srt_font_name_cb(void *priv, const char *name) |
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{ |
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srt_stack_push_pop(priv, 'f', !name); |
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if (name) |
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srt_print(priv, "<font face=\"%s\">", name); |
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} |
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static void srt_font_size_cb(void *priv, int size) |
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{ |
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srt_stack_push_pop(priv, 'f', size < 0); |
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if (size >= 0) |
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srt_print(priv, "<font size=\"%d\">", size); |
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} |
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static void srt_alignment_cb(void *priv, int alignment) |
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{ |
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SRTContext *s = priv; |
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if (!s->alignment_applied && alignment >= 0) { |
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srt_print(s, "{\\an%d}", alignment); |
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s->alignment_applied = 1; |
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} |
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} |
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static void srt_cancel_overrides_cb(void *priv, const char *style) |
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{ |
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srt_stack_push_pop(priv, 0, 1); |
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srt_style_apply(priv, style); |
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} |
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static void srt_move_cb(void *priv, int x1, int y1, int x2, int y2, |
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int t1, int t2) |
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{ |
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// TODO: add a AV_PKT_DATA_SUBTITLE_POSITION side data when a new subtitles |
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// encoding API passing the AVPacket is available. |
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} |
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static void srt_end_cb(void *priv) |
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{ |
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srt_stack_push_pop(priv, 0, 1); |
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} |
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static const ASSCodesCallbacks srt_callbacks = { |
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.text = srt_text_cb, |
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.new_line = srt_new_line_cb, |
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.style = srt_style_cb, |
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.color = srt_color_cb, |
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.font_name = srt_font_name_cb, |
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.font_size = srt_font_size_cb, |
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.alignment = srt_alignment_cb, |
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.cancel_overrides = srt_cancel_overrides_cb, |
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.move = srt_move_cb, |
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.end = srt_end_cb, |
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}; |
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static const ASSCodesCallbacks text_callbacks = { |
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.text = srt_text_cb, |
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.new_line = srt_new_line_cb, |
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}; |
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static int encode_frame(AVCodecContext *avctx, |
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unsigned char *buf, int bufsize, const AVSubtitle *sub, |
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const ASSCodesCallbacks *cb) |
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{ |
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SRTContext *s = avctx->priv_data; |
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ASSDialog *dialog; |
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int i; |
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av_bprint_clear(&s->buffer); |
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✓✓ |
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for (i=0; i<sub->num_rects; i++) { |
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const char *ass = sub->rects[i]->ass; |
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✗✓ |
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if (sub->rects[i]->type != SUBTITLE_ASS) { |
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av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n"); |
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return AVERROR(EINVAL); |
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} |
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#if FF_API_ASS_TIMING |
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✗✓ |
40 |
if (!strncmp(ass, "Dialogue: ", 10)) { |
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int num; |
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dialog = ff_ass_split_dialog(s->ass_ctx, ass, 0, &num); |
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for (; dialog && num--; dialog++) { |
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s->alignment_applied = 0; |
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if (avctx->codec_id == AV_CODEC_ID_SUBRIP) |
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srt_style_apply(s, dialog->style); |
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ff_ass_split_override_codes(cb, s, dialog->text); |
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} |
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} else { |
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#endif |
259 |
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dialog = ff_ass_split_dialog2(s->ass_ctx, ass); |
260 |
✗✓ |
40 |
if (!dialog) |
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return AVERROR(ENOMEM); |
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s->alignment_applied = 0; |
263 |
✓✓ |
40 |
if (avctx->codec_id == AV_CODEC_ID_SUBRIP) |
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srt_style_apply(s, dialog->style); |
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ff_ass_split_override_codes(cb, s, dialog->text); |
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ff_ass_free_dialog(&dialog); |
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#if FF_API_ASS_TIMING |
268 |
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} |
269 |
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#endif |
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} |
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✗✓ |
40 |
if (!av_bprint_is_complete(&s->buffer)) |
273 |
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return AVERROR(ENOMEM); |
274 |
✗✓ |
40 |
if (!s->buffer.len) |
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return 0; |
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✗✓ |
40 |
if (s->buffer.len > bufsize) { |
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av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n"); |
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return AVERROR_BUFFER_TOO_SMALL; |
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} |
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memcpy(buf, s->buffer.str, s->buffer.len); |
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return s->buffer.len; |
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} |
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3 |
static int srt_encode_frame(AVCodecContext *avctx, |
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unsigned char *buf, int bufsize, const AVSubtitle *sub) |
288 |
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{ |
289 |
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return encode_frame(avctx, buf, bufsize, sub, &srt_callbacks); |
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} |
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static int text_encode_frame(AVCodecContext *avctx, |
293 |
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unsigned char *buf, int bufsize, const AVSubtitle *sub) |
294 |
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{ |
295 |
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return encode_frame(avctx, buf, bufsize, sub, &text_callbacks); |
296 |
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} |
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298 |
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static int srt_encode_close(AVCodecContext *avctx) |
299 |
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{ |
300 |
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SRTContext *s = avctx->priv_data; |
301 |
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ff_ass_split_free(s->ass_ctx); |
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av_bprint_finalize(&s->buffer, NULL); |
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return 0; |
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} |
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#if CONFIG_SRT_ENCODER |
307 |
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/* deprecated encoder */ |
308 |
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AVCodec ff_srt_encoder = { |
309 |
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.name = "srt", |
310 |
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.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
311 |
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.type = AVMEDIA_TYPE_SUBTITLE, |
312 |
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.id = AV_CODEC_ID_SUBRIP, |
313 |
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.priv_data_size = sizeof(SRTContext), |
314 |
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.init = srt_encode_init, |
315 |
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.encode_sub = srt_encode_frame, |
316 |
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.close = srt_encode_close, |
317 |
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}; |
318 |
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#endif |
319 |
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320 |
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#if CONFIG_SUBRIP_ENCODER |
321 |
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AVCodec ff_subrip_encoder = { |
322 |
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.name = "subrip", |
323 |
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.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
324 |
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.type = AVMEDIA_TYPE_SUBTITLE, |
325 |
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.id = AV_CODEC_ID_SUBRIP, |
326 |
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.priv_data_size = sizeof(SRTContext), |
327 |
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.init = srt_encode_init, |
328 |
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.encode_sub = srt_encode_frame, |
329 |
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.close = srt_encode_close, |
330 |
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}; |
331 |
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#endif |
332 |
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333 |
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#if CONFIG_TEXT_ENCODER |
334 |
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AVCodec ff_text_encoder = { |
335 |
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.name = "text", |
336 |
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.long_name = NULL_IF_CONFIG_SMALL("Raw text subtitle"), |
337 |
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.type = AVMEDIA_TYPE_SUBTITLE, |
338 |
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.id = AV_CODEC_ID_TEXT, |
339 |
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.priv_data_size = sizeof(SRTContext), |
340 |
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.init = srt_encode_init, |
341 |
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.encode_sub = text_encode_frame, |
342 |
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.close = srt_encode_close, |
343 |
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}; |
344 |
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#endif |