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htmlsubtitles.c
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1 /*
2  * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
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 #include "libavutil/avstring.h"
22 #include "libavutil/common.h"
23 #include "libavutil/parseutils.h"
24 #include "htmlsubtitles.h"
25 
26 static int html_color_parse(void *log_ctx, const char *str)
27 {
28  uint8_t rgba[4];
29  if (av_parse_color(rgba, str, strcspn(str, "\" >"), log_ctx) < 0)
30  return -1;
31  return rgba[0] | rgba[1] << 8 | rgba[2] << 16;
32 }
33 
34 enum {
40 };
41 
42 typedef struct SrtStack {
43  char tag[128];
44  char param[PARAM_NUMBER][128];
45 } SrtStack;
46 
47 static void rstrip_spaces_buf(AVBPrint *buf)
48 {
49  while (buf->len > 0 && buf->str[buf->len - 1] == ' ')
50  buf->str[--buf->len] = 0;
51 }
52 
53 void ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in)
54 {
55  char *param, buffer[128], tmp[128];
56  int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0;
57  SrtStack stack[16];
58 
59  stack[0].tag[0] = 0;
60  strcpy(stack[0].param[PARAM_SIZE], "{\\fs}");
61  strcpy(stack[0].param[PARAM_COLOR], "{\\c}");
62  strcpy(stack[0].param[PARAM_FACE], "{\\fn}");
63 
64  for (; !end && *in; in++) {
65  switch (*in) {
66  case '\r':
67  break;
68  case '\n':
69  if (line_start) {
70  end = 1;
71  break;
72  }
73  rstrip_spaces_buf(dst);
74  av_bprintf(dst, "\\N");
75  line_start = 1;
76  break;
77  case ' ':
78  if (!line_start)
79  av_bprint_chars(dst, *in, 1);
80  break;
81  case '{': /* skip all {\xxx} substrings except for {\an%d}
82  and all microdvd like styles such as {Y:xxx} */
83  len = 0;
84  an += sscanf(in, "{\\an%*1u}%n", &len) >= 0 && len > 0;
85  if ((an != 1 && (len = 0, sscanf(in, "{\\%*[^}]}%n", &len) >= 0 && len > 0)) ||
86  (len = 0, sscanf(in, "{%*1[CcFfoPSsYy]:%*[^}]}%n", &len) >= 0 && len > 0)) {
87  in += len - 1;
88  } else
89  av_bprint_chars(dst, *in, 1);
90  break;
91  case '<':
92  tag_close = in[1] == '/';
93  len = 0;
94  if (sscanf(in+tag_close+1, "%127[^>]>%n", buffer, &len) >= 1 && len > 0) {
95  const char *tagname = buffer;
96  while (*tagname == ' ')
97  tagname++;
98  if ((param = strchr(tagname, ' ')))
99  *param++ = 0;
100  if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack)) ||
101  ( tag_close && sptr > 0 && !strcmp(stack[sptr-1].tag, tagname))) {
102  int i, j, unknown = 0;
103  in += len + tag_close;
104  if (!tag_close)
105  memset(stack+sptr, 0, sizeof(*stack));
106  if (!strcmp(tagname, "font")) {
107  if (tag_close) {
108  for (i=PARAM_NUMBER-1; i>=0; i--)
109  if (stack[sptr-1].param[i][0])
110  for (j=sptr-2; j>=0; j--)
111  if (stack[j].param[i][0]) {
112  av_bprintf(dst, "%s", stack[j].param[i]);
113  break;
114  }
115  } else {
116  while (param) {
117  if (!strncmp(param, "size=", 5)) {
118  unsigned font_size;
119  param += 5 + (param[5] == '"');
120  if (sscanf(param, "%u", &font_size) == 1) {
121  snprintf(stack[sptr].param[PARAM_SIZE],
122  sizeof(stack[0].param[PARAM_SIZE]),
123  "{\\fs%u}", font_size);
124  }
125  } else if (!strncmp(param, "color=", 6)) {
126  param += 6 + (param[6] == '"');
127  snprintf(stack[sptr].param[PARAM_COLOR],
128  sizeof(stack[0].param[PARAM_COLOR]),
129  "{\\c&H%X&}",
130  html_color_parse(log_ctx, param));
131  } else if (!strncmp(param, "face=", 5)) {
132  param += 5 + (param[5] == '"');
133  len = strcspn(param,
134  param[-1] == '"' ? "\"" :" ");
135  av_strlcpy(tmp, param,
136  FFMIN(sizeof(tmp), len+1));
137  param += len;
138  snprintf(stack[sptr].param[PARAM_FACE],
139  sizeof(stack[0].param[PARAM_FACE]),
140  "{\\fn%s}", tmp);
141  }
142  if ((param = strchr(param, ' ')))
143  param++;
144  }
145  for (i=0; i<PARAM_NUMBER; i++)
146  if (stack[sptr].param[i][0])
147  av_bprintf(dst, "%s", stack[sptr].param[i]);
148  }
149  } else if (!tagname[1] && strspn(tagname, "bisu") == 1) {
150  av_bprintf(dst, "{\\%c%d}", tagname[0], !tag_close);
151  } else {
152  unknown = 1;
153  snprintf(tmp, sizeof(tmp), "</%s>", tagname);
154  }
155  if (tag_close) {
156  sptr--;
157  } else if (unknown && !strstr(in, tmp)) {
158  in -= len + tag_close;
159  av_bprint_chars(dst, *in, 1);
160  } else
161  av_strlcpy(stack[sptr++].tag, tagname,
162  sizeof(stack[0].tag));
163  break;
164  }
165  }
166  default:
167  av_bprint_chars(dst, *in, 1);
168  break;
169  }
170  if (*in != ' ' && *in != '\r' && *in != '\n')
171  line_start = 0;
172  }
173 
174  while (dst->len >= 2 && !strncmp(&dst->str[dst->len - 2], "\\N", 2))
175  dst->len -= 2;
176  dst->str[dst->len] = 0;
177  rstrip_spaces_buf(dst);
178 }
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
char tag[128]
Definition: htmlsubtitles.c:43
static void rstrip_spaces_buf(AVBPrint *buf)
Definition: htmlsubtitles.c:47
uint8_t
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
uint32_t tag
Definition: movenc.c:1382
int av_parse_color(uint8_t *rgba_color, const char *color_string, int slen, void *log_ctx)
Put the RGBA values that correspond to color_string in rgba_color.
Definition: parseutils.c:349
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
#define FFMIN(a, b)
Definition: common.h:96
#define FF_ARRAY_ELEMS(a)
char param[PARAM_NUMBER][128]
Definition: htmlsubtitles.c:44
void ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in)
Definition: htmlsubtitles.c:53
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:690
#define snprintf
Definition: snprintf.h:34
misc parsing utilities
static int html_color_parse(void *log_ctx, const char *str)
Definition: htmlsubtitles.c:26
common internal and external API header
int len
static uint8_t tmp[8]
Definition: des.c:38
GLuint buffer
Definition: opengl_enc.c:102
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140