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https://github.com/FFmpeg/FFmpeg.git
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lavc: add MicroDVD decoder.
Based on my MicroDVD->ASS conversion code from MPlayer (sub/subassconvert.c).
This commit is contained in:
Clément Bœsch
parent
e40981b8c4
commit
423b827668
@ -27,6 +27,7 @@ version next:
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- ffmpeg -benchmark_all option
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- super2xsai filter ported from libmpcodecs
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- add libavresample audio conversion library for compatibility
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- MicroDVD decoder
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version 0.10:
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@ -837,7 +837,7 @@ performance on systems without hardware floating point support).
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@item SSA/ASS @tab X @tab X @tab X @tab X
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@item DVB @tab X @tab X @tab X @tab X
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@item DVD @tab X @tab X @tab X @tab X
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@item MicroDVD @tab X @tab X @tab @tab
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@item MicroDVD @tab X @tab X @tab @tab X
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@item PGS @tab @tab @tab @tab X
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@item SubRip (SRT) @tab X @tab X @tab X @tab X
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@item XSUB @tab @tab @tab X @tab X
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@ -239,6 +239,7 @@ OBJS-$(CONFIG_MACE3_DECODER) += mace.o
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OBJS-$(CONFIG_MACE6_DECODER) += mace.o
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OBJS-$(CONFIG_MDEC_DECODER) += mdec.o mpeg12.o mpeg12data.o \
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mpegvideo.o error_resilience.o
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OBJS-$(CONFIG_MICRODVD_DECODER) += microdvddec.o ass.o
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OBJS-$(CONFIG_MIMIC_DECODER) += mimic.o
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OBJS-$(CONFIG_MJPEG_DECODER) += mjpegdec.o mjpeg.o
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OBJS-$(CONFIG_MJPEG_ENCODER) += mjpegenc.o mjpeg.o \
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@ -397,6 +397,7 @@ void avcodec_register_all(void)
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REGISTER_ENCDEC (ASS, ass);
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REGISTER_ENCDEC (DVBSUB, dvbsub);
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REGISTER_ENCDEC (DVDSUB, dvdsub);
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REGISTER_DECODER (MICRODVD, microdvd);
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REGISTER_DECODER (PGSSUB, pgssub);
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REGISTER_ENCDEC (SRT, srt);
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REGISTER_ENCDEC (XSUB, xsub);
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317
libavcodec/microdvddec.c
Normal file
317
libavcodec/microdvddec.c
Normal file
@ -0,0 +1,317 @@
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/*
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* Copyright (c) 2012 Clément Bœsch
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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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/**
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* @file
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* MicroDVD subtitle decoder
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*
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* Based on the specifications found here:
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* https://trac.videolan.org/vlc/ticket/1825#comment:6
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/bprint.h"
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#include "avcodec.h"
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#include "ass.h"
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static int indexof(const char *s, int c)
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{
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char *f = strchr(s, c);
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return f ? (f - s) : -1;
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}
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struct microdvd_tag {
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char key;
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int persistent;
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uint32_t data1;
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uint32_t data2;
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char *data_string;
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int data_string_len;
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};
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#define MICRODVD_PERSISTENT_OFF 0
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#define MICRODVD_PERSISTENT_ON 1
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#define MICRODVD_PERSISTENT_OPENED 2
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// Color, Font, Size, cHarset, stYle, Position, cOordinate
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#define MICRODVD_TAGS "cfshyYpo"
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static void microdvd_set_tag(struct microdvd_tag *tags, struct microdvd_tag tag)
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{
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int tag_index = indexof(MICRODVD_TAGS, tag.key);
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if (tag_index < 0)
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return;
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memcpy(&tags[tag_index], &tag, sizeof(tag));
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}
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// italic, bold, underline, strike-through
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#define MICRODVD_STYLES "ibus"
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static char *microdvd_load_tags(struct microdvd_tag *tags, char *s)
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{
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while (*s == '{') {
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char *start = s;
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char tag_char = *(s + 1);
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struct microdvd_tag tag = {0};
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if (!tag_char || *(s + 2) != ':')
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break;
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s += 3;
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switch (tag_char) {
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/* Style */
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case 'Y':
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tag.persistent = MICRODVD_PERSISTENT_ON;
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case 'y':
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while (*s && *s != '}') {
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int style_index = indexof(MICRODVD_STYLES, *s);
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if (style_index >= 0)
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tag.data1 |= (1 << style_index);
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s++;
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}
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if (*s != '}')
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break;
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/* We must distinguish persistent and non-persistent styles
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* to handle this kind of style tags: {y:ib}{Y:us} */
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tag.key = tag_char;
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break;
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/* Color */
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case 'C':
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tag.persistent = MICRODVD_PERSISTENT_ON;
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case 'c':
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tag.data1 = strtol(s, &s, 16) & 0x00ffffff;
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if (*s != '}')
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break;
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tag.key = 'c';
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break;
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/* Font name */
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case 'F':
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tag.persistent = MICRODVD_PERSISTENT_ON;
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case 'f': {
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int len = indexof(s, '}');
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if (len < 0)
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break;
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tag.data_string = s;
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tag.data_string_len = len;
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s += len;
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tag.key = 'f';
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break;
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}
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/* Font size */
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case 'S':
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tag.persistent = MICRODVD_PERSISTENT_ON;
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case 's':
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tag.data1 = strtol(s, &s, 10);
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if (*s != '}')
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break;
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tag.key = 's';
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break;
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/* Charset */
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case 'H': {
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//TODO: not yet handled, just parsed.
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int len = indexof(s, '}');
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if (len < 0)
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break;
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tag.data_string = s;
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tag.data_string_len = len;
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s += len;
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tag.key = 'h';
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break;
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}
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/* Position */
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case 'P':
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tag.persistent = MICRODVD_PERSISTENT_ON;
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tag.data1 = (*s++ == '1');
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if (*s != '}')
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break;
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tag.key = 'p';
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break;
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/* Coordinates */
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case 'o':
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tag.persistent = MICRODVD_PERSISTENT_ON;
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tag.data1 = strtol(s, &s, 10);
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if (*s != ',')
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break;
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s++;
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tag.data2 = strtol(s, &s, 10);
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if (*s != '}')
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break;
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tag.key = 'o';
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break;
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default: /* Unknown tag, we consider it's text */
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break;
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}
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if (tag.key == 0)
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return start;
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microdvd_set_tag(tags, tag);
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s++;
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}
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return s;
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}
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static void microdvd_open_tags(AVBPrint *new_line, struct microdvd_tag *tags)
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{
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int i, sidx;
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for (i = 0; i < sizeof(MICRODVD_TAGS) - 1; i++) {
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if (tags[i].persistent == MICRODVD_PERSISTENT_OPENED)
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continue;
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switch (tags[i].key) {
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case 'Y':
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case 'y':
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for (sidx = 0; sidx < sizeof(MICRODVD_STYLES) - 1; sidx++)
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if (tags[i].data1 & (1 << sidx))
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av_bprintf(new_line, "{\\%c1}", MICRODVD_STYLES[sidx]);
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break;
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case 'c':
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av_bprintf(new_line, "{\\c&H%06X&}", tags[i].data1);
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break;
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case 'f':
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av_bprintf(new_line, "{\\fn%.*s}",
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tags[i].data_string_len, tags[i].data_string);
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break;
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case 's':
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av_bprintf(new_line, "{\\fs%d}", tags[i].data1);
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break;
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case 'p':
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if (tags[i].data1 == 0)
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av_bprintf(new_line, "{\\an8}");
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break;
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case 'o':
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av_bprintf(new_line, "{\\pos(%d,%d)}",
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tags[i].data1, tags[i].data2);
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break;
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}
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if (tags[i].persistent == MICRODVD_PERSISTENT_ON)
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tags[i].persistent = MICRODVD_PERSISTENT_OPENED;
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}
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}
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static void microdvd_close_no_persistent_tags(AVBPrint *new_line,
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struct microdvd_tag *tags)
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{
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int i, sidx;
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for (i = sizeof(MICRODVD_TAGS) - 2; i; i--) {
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if (tags[i].persistent != MICRODVD_PERSISTENT_OFF)
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continue;
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switch (tags[i].key) {
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case 'y':
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for (sidx = sizeof(MICRODVD_STYLES) - 2; sidx >= 0; sidx--)
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if (tags[i].data1 & (1 << sidx))
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av_bprintf(new_line, "{\\%c0}", MICRODVD_STYLES[sidx]);
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break;
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case 'c':
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av_bprintf(new_line, "{\\c}");
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break;
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case 'f':
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av_bprintf(new_line, "{\\fn}");
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break;
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case 's':
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av_bprintf(new_line, "{\\fs}");
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break;
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}
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tags[i].key = 0;
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}
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}
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static int microdvd_decode_frame(AVCodecContext *avctx,
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void *data, int *got_sub_ptr, AVPacket *avpkt)
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{
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AVSubtitle *sub = data;
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AVBPrint new_line;
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char *decoded_sub;
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char *line = avpkt->data;
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char *end = avpkt->data + avpkt->size;
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int64_t frame_start = avpkt->pts;
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int64_t frame_end = avpkt->pts + avpkt->duration;
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int ts_start = av_rescale_q(frame_start, avctx->time_base, (AVRational){1,100});
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int ts_end = av_rescale_q(frame_end, avctx->time_base, (AVRational){1,100});
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struct microdvd_tag tags[sizeof(MICRODVD_TAGS) - 1] = {{0}};
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if (avpkt->size <= 0)
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return avpkt->size;
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av_bprint_init(&new_line, 0, 2048);
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// skip {frame_start}{frame_end}
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line = strchr(line, '}'); if (!line) goto end; line++;
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line = strchr(line, '}'); if (!line) goto end; line++;
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// subtitle content
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while (line < end && *line) {
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// parse MicroDVD tags, and open them in ASS
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line = microdvd_load_tags(tags, line);
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microdvd_open_tags(&new_line, tags);
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// simple copy until EOL or forced carriage return
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while (line < end && *line && *line != '|') {
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av_bprint_chars(&new_line, *line, 1);
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line++;
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}
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// line split
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if (line < end && *line == '|') {
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microdvd_close_no_persistent_tags(&new_line, tags);
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av_bprintf(&new_line, "\\N");
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line++;
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}
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}
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end:
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av_bprint_finalize(&new_line, &decoded_sub);
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if (*decoded_sub)
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ff_ass_add_rect(sub, decoded_sub, ts_start, ts_end, 0);
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av_free(decoded_sub);
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*got_sub_ptr = sub->num_rects > 0;
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return avpkt->size;
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}
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AVCodec ff_microdvd_decoder = {
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.name = "microdvd",
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.long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle"),
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = CODEC_ID_MICRODVD,
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.init = ff_ass_subtitle_header_default,
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.decode = microdvd_decode_frame,
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};
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@ -27,7 +27,7 @@
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*/
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#define LIBAVCODEC_VERSION_MAJOR 54
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#define LIBAVCODEC_VERSION_MINOR 15
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#define LIBAVCODEC_VERSION_MINOR 16
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#define LIBAVCODEC_VERSION_MICRO 100
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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