mirror of https://git.ffmpeg.org/ffmpeg.git
333 lines
9.4 KiB
C
333 lines
9.4 KiB
C
/*
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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 "config_components.h"
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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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#include "codec_internal.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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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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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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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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if (close) {
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int i = c ? srt_stack_find(s, c) : 0;
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if (i < 0)
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return;
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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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if (st) {
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int c = st->primary_color & 0xFFFFFF;
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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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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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if (st->font_size != ASS_DEFAULT_FONT_SIZE)
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srt_print(s, " size=\"%d\"", st->font_size);
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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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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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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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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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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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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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for (i=0; i<sub->num_rects; i++) {
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const char *ass = sub->rects[i]->ass;
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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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dialog = ff_ass_split_dialog(s->ass_ctx, ass);
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if (!dialog)
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return AVERROR(ENOMEM);
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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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ff_ass_free_dialog(&dialog);
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}
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if (!av_bprint_is_complete(&s->buffer))
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return AVERROR(ENOMEM);
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if (!s->buffer.len)
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return 0;
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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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static int srt_encode_frame(AVCodecContext *avctx,
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unsigned char *buf, int bufsize, const AVSubtitle *sub)
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{
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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,
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unsigned char *buf, int bufsize, const AVSubtitle *sub)
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{
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return encode_frame(avctx, buf, bufsize, sub, &text_callbacks);
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}
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static int srt_encode_close(AVCodecContext *avctx)
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{
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SRTContext *s = avctx->priv_data;
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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
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/* deprecated encoder */
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const FFCodec ff_srt_encoder = {
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.p.name = "srt",
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CODEC_LONG_NAME("SubRip subtitle"),
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.p.type = AVMEDIA_TYPE_SUBTITLE,
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.p.id = AV_CODEC_ID_SUBRIP,
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.priv_data_size = sizeof(SRTContext),
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.init = srt_encode_init,
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FF_CODEC_ENCODE_SUB_CB(srt_encode_frame),
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.close = srt_encode_close,
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};
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#endif
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#if CONFIG_SUBRIP_ENCODER
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const FFCodec ff_subrip_encoder = {
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.p.name = "subrip",
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CODEC_LONG_NAME("SubRip subtitle"),
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.p.type = AVMEDIA_TYPE_SUBTITLE,
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.p.id = AV_CODEC_ID_SUBRIP,
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.priv_data_size = sizeof(SRTContext),
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.init = srt_encode_init,
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FF_CODEC_ENCODE_SUB_CB(srt_encode_frame),
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.close = srt_encode_close,
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};
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#endif
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#if CONFIG_TEXT_ENCODER
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const FFCodec ff_text_encoder = {
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.p.name = "text",
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CODEC_LONG_NAME("Raw text subtitle"),
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.p.type = AVMEDIA_TYPE_SUBTITLE,
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.p.id = AV_CODEC_ID_TEXT,
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.priv_data_size = sizeof(SRTContext),
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.init = srt_encode_init,
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FF_CODEC_ENCODE_SUB_CB(text_encode_frame),
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.close = srt_encode_close,
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};
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#endif
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