LCOV - code coverage report
Current view: top level - libavcodec - srtenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 83 151 55.0 %
Date: 2017-12-14 01:15:32 Functions: 14 22 63.6 %

          Line data    Source code
       1             : /*
       2             :  * SubRip subtitle encoder
       3             :  * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include <stdarg.h>
      23             : #include "avcodec.h"
      24             : #include "libavutil/avstring.h"
      25             : #include "libavutil/bprint.h"
      26             : #include "ass_split.h"
      27             : #include "ass.h"
      28             : 
      29             : 
      30             : #define SRT_STACK_SIZE 64
      31             : 
      32             : typedef struct {
      33             :     AVCodecContext *avctx;
      34             :     ASSSplitContext *ass_ctx;
      35             :     AVBPrint buffer;
      36             :     char stack[SRT_STACK_SIZE];
      37             :     int stack_ptr;
      38             :     int alignment_applied;
      39             : } SRTContext;
      40             : 
      41             : 
      42             : #ifdef __GNUC__
      43             : __attribute__ ((__format__ (__printf__, 2, 3)))
      44             : #endif
      45          82 : static void srt_print(SRTContext *s, const char *str, ...)
      46             : {
      47             :     va_list vargs;
      48          82 :     va_start(vargs, str);
      49          82 :     av_vbprintf(&s->buffer, str, vargs);
      50          82 :     va_end(vargs);
      51          82 : }
      52             : 
      53           3 : static int srt_stack_push(SRTContext *s, const char c)
      54             : {
      55           3 :     if (s->stack_ptr >= SRT_STACK_SIZE)
      56           0 :         return -1;
      57           3 :     s->stack[s->stack_ptr++] = c;
      58           3 :     return 0;
      59             : }
      60             : 
      61           3 : static char srt_stack_pop(SRTContext *s)
      62             : {
      63           3 :     if (s->stack_ptr <= 0)
      64           0 :         return 0;
      65           3 :     return s->stack[--s->stack_ptr];
      66             : }
      67             : 
      68           0 : static int srt_stack_find(SRTContext *s, const char c)
      69             : {
      70             :     int i;
      71           0 :     for (i = s->stack_ptr-1; i >= 0; i--)
      72           0 :         if (s->stack[i] == c)
      73           0 :             break;
      74           0 :     return i;
      75             : }
      76             : 
      77           3 : static void srt_close_tag(SRTContext *s, char tag)
      78             : {
      79           3 :     srt_print(s, "</%c%s>", tag, tag == 'f' ? "ont" : "");
      80           3 : }
      81             : 
      82           3 : static void srt_stack_push_pop(SRTContext *s, const char c, int close)
      83             : {
      84           3 :     if (close) {
      85           3 :         int i = c ? srt_stack_find(s, c) : 0;
      86           3 :         if (i < 0)
      87           0 :             return;
      88           9 :         while (s->stack_ptr != i)
      89           3 :             srt_close_tag(s, srt_stack_pop(s));
      90           0 :     } else if (srt_stack_push(s, c) < 0)
      91           0 :         av_log(s->avctx, AV_LOG_ERROR, "tag stack overflow\n");
      92             : }
      93             : 
      94           3 : static void srt_style_apply(SRTContext *s, const char *style)
      95             : {
      96           3 :     ASSStyle *st = ff_ass_style_get(s->ass_ctx, style);
      97           3 :     if (st) {
      98           3 :         int c = st->primary_color & 0xFFFFFF;
      99           3 :         if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT) ||
     100           0 :             st->font_size != ASS_DEFAULT_FONT_SIZE ||
     101             :             c != ASS_DEFAULT_COLOR) {
     102           3 :             srt_print(s, "<font");
     103           3 :             if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT))
     104           3 :                 srt_print(s, " face=\"%s\"", st->font_name);
     105           3 :             if (st->font_size != ASS_DEFAULT_FONT_SIZE)
     106           3 :                 srt_print(s, " size=\"%d\"", st->font_size);
     107           3 :             if (c != ASS_DEFAULT_COLOR)
     108           0 :                 srt_print(s, " color=\"#%06x\"",
     109           0 :                           (c & 0xFF0000) >> 16 | c & 0xFF00 | (c & 0xFF) << 16);
     110           3 :             srt_print(s, ">");
     111           3 :             srt_stack_push(s, 'f');
     112             :         }
     113           3 :         if (st->bold != ASS_DEFAULT_BOLD) {
     114           0 :             srt_print(s, "<b>");
     115           0 :             srt_stack_push(s, 'b');
     116             :         }
     117           3 :         if (st->italic != ASS_DEFAULT_ITALIC) {
     118           0 :             srt_print(s, "<i>");
     119           0 :             srt_stack_push(s, 'i');
     120             :         }
     121           3 :         if (st->underline != ASS_DEFAULT_UNDERLINE) {
     122           0 :             srt_print(s, "<u>");
     123           0 :             srt_stack_push(s, 'u');
     124             :         }
     125           3 :         if (st->alignment != ASS_DEFAULT_ALIGNMENT) {
     126           0 :             srt_print(s, "{\\an%d}", st->alignment);
     127           0 :             s->alignment_applied = 1;
     128             :         }
     129             :     }
     130           3 : }
     131             : 
     132             : 
     133           2 : static av_cold int srt_encode_init(AVCodecContext *avctx)
     134             : {
     135           2 :     SRTContext *s = avctx->priv_data;
     136           2 :     s->avctx = avctx;
     137           2 :     s->ass_ctx = ff_ass_split(avctx->subtitle_header);
     138           2 :     av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
     139           2 :     return s->ass_ctx ? 0 : AVERROR_INVALIDDATA;
     140             : }
     141             : 
     142         107 : static void srt_text_cb(void *priv, const char *text, int len)
     143             : {
     144         107 :     SRTContext *s = priv;
     145         107 :     av_bprint_append_data(&s->buffer, text, len);
     146         107 : }
     147             : 
     148          67 : static void srt_new_line_cb(void *priv, int forced)
     149             : {
     150          67 :     srt_print(priv, "\r\n");
     151          67 : }
     152             : 
     153           0 : static void srt_style_cb(void *priv, char style, int close)
     154             : {
     155           0 :     srt_stack_push_pop(priv, style, close);
     156           0 :     if (!close)
     157           0 :         srt_print(priv, "<%c>", style);
     158           0 : }
     159             : 
     160           0 : static void srt_color_cb(void *priv, unsigned int color, unsigned int color_id)
     161             : {
     162           0 :     if (color_id > 1)
     163           0 :         return;
     164           0 :     srt_stack_push_pop(priv, 'f', color == 0xFFFFFFFF);
     165           0 :     if (color != 0xFFFFFFFF)
     166           0 :         srt_print(priv, "<font color=\"#%06x\">",
     167           0 :               (color & 0xFF0000) >> 16 | color & 0xFF00 | (color & 0xFF) << 16);
     168             : }
     169             : 
     170           0 : static void srt_font_name_cb(void *priv, const char *name)
     171             : {
     172           0 :     srt_stack_push_pop(priv, 'f', !name);
     173           0 :     if (name)
     174           0 :         srt_print(priv, "<font face=\"%s\">", name);
     175           0 : }
     176             : 
     177           0 : static void srt_font_size_cb(void *priv, int size)
     178             : {
     179           0 :     srt_stack_push_pop(priv, 'f', size < 0);
     180           0 :     if (size >= 0)
     181           0 :         srt_print(priv, "<font size=\"%d\">", size);
     182           0 : }
     183             : 
     184           0 : static void srt_alignment_cb(void *priv, int alignment)
     185             : {
     186           0 :     SRTContext *s = priv;
     187           0 :     if (!s->alignment_applied && alignment >= 0) {
     188           0 :         srt_print(s, "{\\an%d}", alignment);
     189           0 :         s->alignment_applied = 1;
     190             :     }
     191           0 : }
     192             : 
     193           0 : static void srt_cancel_overrides_cb(void *priv, const char *style)
     194             : {
     195           0 :     srt_stack_push_pop(priv, 0, 1);
     196           0 :     srt_style_apply(priv, style);
     197           0 : }
     198             : 
     199           0 : static void srt_move_cb(void *priv, int x1, int y1, int x2, int y2,
     200             :                         int t1, int t2)
     201             : {
     202             :     // TODO: add a AV_PKT_DATA_SUBTITLE_POSITION side data when a new subtitles
     203             :     // encoding API passing the AVPacket is available.
     204           0 : }
     205             : 
     206           3 : static void srt_end_cb(void *priv)
     207             : {
     208           3 :     srt_stack_push_pop(priv, 0, 1);
     209           3 : }
     210             : 
     211             : static const ASSCodesCallbacks srt_callbacks = {
     212             :     .text             = srt_text_cb,
     213             :     .new_line         = srt_new_line_cb,
     214             :     .style            = srt_style_cb,
     215             :     .color            = srt_color_cb,
     216             :     .font_name        = srt_font_name_cb,
     217             :     .font_size        = srt_font_size_cb,
     218             :     .alignment        = srt_alignment_cb,
     219             :     .cancel_overrides = srt_cancel_overrides_cb,
     220             :     .move             = srt_move_cb,
     221             :     .end              = srt_end_cb,
     222             : };
     223             : 
     224             : static const ASSCodesCallbacks text_callbacks = {
     225             :     .text             = srt_text_cb,
     226             :     .new_line         = srt_new_line_cb,
     227             : };
     228             : 
     229          40 : static int encode_frame(AVCodecContext *avctx,
     230             :                         unsigned char *buf, int bufsize, const AVSubtitle *sub,
     231             :                         const ASSCodesCallbacks *cb)
     232             : {
     233          40 :     SRTContext *s = avctx->priv_data;
     234             :     ASSDialog *dialog;
     235             :     int i;
     236             : 
     237          40 :     av_bprint_clear(&s->buffer);
     238             : 
     239          80 :     for (i=0; i<sub->num_rects; i++) {
     240          40 :         const char *ass = sub->rects[i]->ass;
     241             : 
     242          40 :         if (sub->rects[i]->type != SUBTITLE_ASS) {
     243           0 :             av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
     244           0 :             return AVERROR(ENOSYS);
     245             :         }
     246             : 
     247             : #if FF_API_ASS_TIMING
     248          40 :         if (!strncmp(ass, "Dialogue: ", 10)) {
     249             :             int num;
     250           0 :             dialog = ff_ass_split_dialog(s->ass_ctx, ass, 0, &num);
     251           0 :             for (; dialog && num--; dialog++) {
     252           0 :                 s->alignment_applied = 0;
     253           0 :                 if (avctx->codec_id == AV_CODEC_ID_SUBRIP)
     254           0 :                     srt_style_apply(s, dialog->style);
     255           0 :                 ff_ass_split_override_codes(cb, s, dialog->text);
     256             :             }
     257             :         } else {
     258             : #endif
     259          40 :             dialog = ff_ass_split_dialog2(s->ass_ctx, ass);
     260          40 :             if (!dialog)
     261           0 :                 return AVERROR(ENOMEM);
     262          40 :             s->alignment_applied = 0;
     263          40 :             if (avctx->codec_id == AV_CODEC_ID_SUBRIP)
     264           3 :                 srt_style_apply(s, dialog->style);
     265          40 :             ff_ass_split_override_codes(cb, s, dialog->text);
     266          40 :             ff_ass_free_dialog(&dialog);
     267             : #if FF_API_ASS_TIMING
     268             :         }
     269             : #endif
     270             :     }
     271             : 
     272          40 :     if (!av_bprint_is_complete(&s->buffer))
     273           0 :         return AVERROR(ENOMEM);
     274          40 :     if (!s->buffer.len)
     275           0 :         return 0;
     276             : 
     277          40 :     if (s->buffer.len > bufsize) {
     278           0 :         av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
     279           0 :         return -1;
     280             :     }
     281          40 :     memcpy(buf, s->buffer.str, s->buffer.len);
     282             : 
     283          40 :     return s->buffer.len;
     284             : }
     285             : 
     286           3 : static int srt_encode_frame(AVCodecContext *avctx,
     287             :                                unsigned char *buf, int bufsize, const AVSubtitle *sub)
     288             : {
     289           3 :     return encode_frame(avctx, buf, bufsize, sub, &srt_callbacks);
     290             : }
     291             : 
     292          37 : static int text_encode_frame(AVCodecContext *avctx,
     293             :                              unsigned char *buf, int bufsize, const AVSubtitle *sub)
     294             : {
     295          37 :     return encode_frame(avctx, buf, bufsize, sub, &text_callbacks);
     296             : }
     297             : 
     298           2 : static int srt_encode_close(AVCodecContext *avctx)
     299             : {
     300           2 :     SRTContext *s = avctx->priv_data;
     301           2 :     ff_ass_split_free(s->ass_ctx);
     302           2 :     av_bprint_finalize(&s->buffer, NULL);
     303           2 :     return 0;
     304             : }
     305             : 
     306             : #if CONFIG_SRT_ENCODER
     307             : /* deprecated encoder */
     308             : AVCodec ff_srt_encoder = {
     309             :     .name           = "srt",
     310             :     .long_name      = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
     311             :     .type           = AVMEDIA_TYPE_SUBTITLE,
     312             :     .id             = AV_CODEC_ID_SUBRIP,
     313             :     .priv_data_size = sizeof(SRTContext),
     314             :     .init           = srt_encode_init,
     315             :     .encode_sub     = srt_encode_frame,
     316             :     .close          = srt_encode_close,
     317             : };
     318             : #endif
     319             : 
     320             : #if CONFIG_SUBRIP_ENCODER
     321             : AVCodec ff_subrip_encoder = {
     322             :     .name           = "subrip",
     323             :     .long_name      = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
     324             :     .type           = AVMEDIA_TYPE_SUBTITLE,
     325             :     .id             = AV_CODEC_ID_SUBRIP,
     326             :     .priv_data_size = sizeof(SRTContext),
     327             :     .init           = srt_encode_init,
     328             :     .encode_sub     = srt_encode_frame,
     329             :     .close          = srt_encode_close,
     330             : };
     331             : #endif
     332             : 
     333             : #if CONFIG_TEXT_ENCODER
     334             : AVCodec ff_text_encoder = {
     335             :     .name           = "text",
     336             :     .long_name      = NULL_IF_CONFIG_SMALL("Raw text subtitle"),
     337             :     .type           = AVMEDIA_TYPE_SUBTITLE,
     338             :     .id             = AV_CODEC_ID_TEXT,
     339             :     .priv_data_size = sizeof(SRTContext),
     340             :     .init           = srt_encode_init,
     341             :     .encode_sub     = text_encode_frame,
     342             :     .close          = srt_encode_close,
     343             : };
     344             : #endif

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