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jacosubdec.c
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1 /*
2  * Copyright (c) 2012 Clément Bœsch
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * JACOsub subtitle decoder
24  * @see http://unicorn.us.com/jacosub/jscripts.html
25  */
26 
27 #include <time.h>
28 #include "ass.h"
29 #include "jacosub.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/bprint.h"
33 
34 #undef time
35 
36 static int insert_text(AVBPrint *dst, const char *in, const char *arg)
37 {
38  av_bprintf(dst, "%s", arg);
39  return 0;
40 }
41 
42 static int insert_datetime(AVBPrint *dst, const char *in, const char *arg)
43 {
44  char buf[16] = {0};
45  time_t now = time(0);
46  struct tm ltime;
47 
48  localtime_r(&now, &ltime);
49  if (strftime(buf, sizeof(buf), arg, &ltime))
50  av_bprintf(dst, "%s", buf);
51  return 0;
52 }
53 
54 static int insert_color(AVBPrint *dst, const char *in, const char *arg)
55 {
56  return 1; // skip id
57 }
58 
59 static int insert_font(AVBPrint *dst, const char *in, const char *arg)
60 {
61  return 1; // skip id
62 }
63 
64 static const struct {
65  const char *from;
66  const char *arg;
67  int (*func)(AVBPrint *dst, const char *in, const char *arg);
68 } ass_codes_map[] = {
69  {"\\~", "~", insert_text}, // tilde doesn't need escaping
70  {"~", "{\\h}", insert_text}, // hard space
71  {"\\n", "\\N", insert_text}, // newline
72  {"\\D", "%d %b %Y", insert_datetime}, // current date
73  {"\\T", "%H:%M", insert_datetime}, // current time
74  {"\\N", "{\\r}", insert_text}, // reset to default style
75  {"\\I", "{\\i1}", insert_text}, // italic on
76  {"\\i", "{\\i0}", insert_text}, // italic off
77  {"\\B", "{\\b1}", insert_text}, // bold on
78  {"\\b", "{\\b0}", insert_text}, // bold off
79  {"\\U", "{\\u1}", insert_text}, // underline on
80  {"\\u", "{\\u0}", insert_text}, // underline off
81  {"\\C", "", insert_color}, // TODO: color
82  {"\\F", "", insert_font}, // TODO: font
83 };
84 
85 enum {
86  ALIGN_VB = 1<<0, // vertical bottom, default
87  ALIGN_VM = 1<<1, // vertical middle
88  ALIGN_VT = 1<<2, // vertical top
89  ALIGN_JC = 1<<3, // justify center, default
90  ALIGN_JL = 1<<4, // justify left
91  ALIGN_JR = 1<<5, // justify right
92 };
93 
94 static void jacosub_to_ass(AVCodecContext *avctx, AVBPrint *dst, const char *src)
95 {
96  int i, valign = 0, halign = 0;
97  char c = av_toupper(*src);
98  char directives[128] = {0};
99 
100  /* extract the optional directives */
101  if ((c >= 'A' && c <= 'Z') || c == '[') {
102  char *p = directives;
103  char *pend = directives + sizeof(directives) - 1;
104 
105  do *p++ = av_toupper(*src++);
106  while (*src && !jss_whitespace(*src) && p < pend);
107  *p = 0;
108  src = jss_skip_whitespace(src);
109  }
110 
111  /* handle directives (TODO: handle more of them, and more reliably) */
112  if (strstr(directives, "VB")) valign = ALIGN_VB;
113  else if (strstr(directives, "VM")) valign = ALIGN_VM;
114  else if (strstr(directives, "VT")) valign = ALIGN_VT;
115  if (strstr(directives, "JC")) halign = ALIGN_JC;
116  else if (strstr(directives, "JL")) halign = ALIGN_JL;
117  else if (strstr(directives, "JR")) halign = ALIGN_JR;
118  if (valign || halign) {
119  if (!valign) valign = ALIGN_VB;
120  if (!halign) halign = ALIGN_JC;
121  switch (valign | halign) {
122  case ALIGN_VB | ALIGN_JL: av_bprintf(dst, "{\\an1}"); break; // bottom left
123  case ALIGN_VB | ALIGN_JC: av_bprintf(dst, "{\\an2}"); break; // bottom center
124  case ALIGN_VB | ALIGN_JR: av_bprintf(dst, "{\\an3}"); break; // bottom right
125  case ALIGN_VM | ALIGN_JL: av_bprintf(dst, "{\\an4}"); break; // middle left
126  case ALIGN_VM | ALIGN_JC: av_bprintf(dst, "{\\an5}"); break; // middle center
127  case ALIGN_VM | ALIGN_JR: av_bprintf(dst, "{\\an6}"); break; // middle right
128  case ALIGN_VT | ALIGN_JL: av_bprintf(dst, "{\\an7}"); break; // top left
129  case ALIGN_VT | ALIGN_JC: av_bprintf(dst, "{\\an8}"); break; // top center
130  case ALIGN_VT | ALIGN_JR: av_bprintf(dst, "{\\an9}"); break; // top right
131  }
132  }
133 
134  /* process timed line */
135  while (*src && *src != '\n') {
136 
137  /* text continue on the next line */
138  if (src[0] == '\\' && src[1] == '\n') {
139  src += 2;
140  while (jss_whitespace(*src))
141  src++;
142  continue;
143  }
144 
145  /* special character codes */
146  for (i = 0; i < FF_ARRAY_ELEMS(ass_codes_map); i++) {
147  const char *from = ass_codes_map[i].from;
148  const char *arg = ass_codes_map[i].arg;
149  size_t codemap_len = strlen(from);
150 
151  if (!strncmp(src, from, codemap_len)) {
152  src += codemap_len;
153  src += ass_codes_map[i].func(dst, src, arg);
154  break;
155  }
156  }
157 
158  /* simple char copy */
159  if (i == FF_ARRAY_ELEMS(ass_codes_map))
160  av_bprintf(dst, "%c", *src++);
161  }
162 }
163 
165  void *data, int *got_sub_ptr, AVPacket *avpkt)
166 {
167  int ret;
168  AVSubtitle *sub = data;
169  const char *ptr = avpkt->data;
170 
171  if (avpkt->size <= 0)
172  goto end;
173 
174  if (*ptr) {
175  AVBPrint buffer;
176 
177  // skip timers
178  ptr = jss_skip_whitespace(ptr);
179  ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
180  ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
181 
183  jacosub_to_ass(avctx, &buffer, ptr);
184  ret = ff_ass_add_rect_bprint(sub, &buffer, avpkt->pts, avpkt->duration);
185  av_bprint_finalize(&buffer, NULL);
186  if (ret < 0)
187  return ret;
188  }
189 
190 end:
191  *got_sub_ptr = sub->num_rects > 0;
192  return avpkt->size;
193 }
194 
196  .name = "jacosub",
197  .long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle"),
198  .type = AVMEDIA_TYPE_SUBTITLE,
199  .id = AV_CODEC_ID_JACOSUB,
201  .decode = jacosub_decode_frame,
202 };
#define NULL
Definition: coverity.c:32
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
static int insert_datetime(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:42
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int size
Definition: avcodec.h:1174
unsigned num_rects
Definition: avcodec.h:3537
#define FF_ARRAY_ELEMS(a)
JACOsub shared utils.
AVCodec.
Definition: avcodec.h:3207
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:67
int ff_ass_subtitle_header_default(AVCodecContext *avctx)
Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS with default style.
Definition: ass.c:80
const char * from
Definition: jacosubdec.c:65
uint8_t * data
Definition: avcodec.h:1173
static int insert_text(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:36
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1191
static const struct @61 ass_codes_map[]
#define JSS_MAX_LINESIZE
Definition: jacosub.h:31
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
const char * arg
Definition: jacosubdec.c:66
const char * name
Name of the codec implementation.
Definition: avcodec.h:3214
static struct tm * localtime_r(const time_t *clock, struct tm *result)
Definition: time_internal.h:37
ret
Definition: avfilter.c:974
static int jacosub_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt)
Definition: jacosubdec.c:164
static av_always_inline int jss_whitespace(char c)
Definition: jacosub.h:33
static int insert_color(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:54
AVS_Value src
Definition: avisynth_c.h:482
int ff_ass_add_rect_bprint(AVSubtitle *sub, AVBPrint *buf, int ts_start, int duration)
Same as ff_ass_add_rect_bprint, but taking an AVBPrint buffer instead of a string, and assuming raw=0.
Definition: ass.c:178
main external API structure.
Definition: avcodec.h:1252
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
void * buf
Definition: avisynth_c.h:553
static av_const int av_toupper(int c)
Locale-independent conversion of ASCII characters to uppercase.
Definition: avstring.h:221
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:67
static av_always_inline const char * jss_skip_whitespace(const char *p)
Definition: jacosub.h:38
static double c[64]
static int insert_font(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:59
static void jacosub_to_ass(AVCodecContext *avctx, AVBPrint *dst, const char *src)
Definition: jacosubdec.c:94
AVCodec ff_jacosub_decoder
Definition: jacosubdec.c:195
This structure stores compressed data.
Definition: avcodec.h:1150
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1166
GLuint buffer
Definition: opengl_enc.c:102