Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / assenc.c
1 /*
2 * SSA/ASS 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 <string.h>
23
24 #include "avcodec.h"
25 #include "ass_split.h"
26 #include "ass.h"
27 #include "libavutil/avstring.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/mem.h"
30
31 typedef struct {
32 int id; ///< current event id, ReadOrder field
33 } ASSEncodeContext;
34
35 static av_cold int ass_encode_init(AVCodecContext *avctx)
36 {
37 avctx->extradata = av_malloc(avctx->subtitle_header_size + 1);
38 if (!avctx->extradata)
39 return AVERROR(ENOMEM);
40 memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size);
41 avctx->extradata_size = avctx->subtitle_header_size;
42 avctx->extradata[avctx->extradata_size] = 0;
43 return 0;
44 }
45
46 static int ass_encode_frame(AVCodecContext *avctx,
47 unsigned char *buf, int bufsize,
48 const AVSubtitle *sub)
49 {
50 ASSEncodeContext *s = avctx->priv_data;
51 int i, len, total_len = 0;
52
53 for (i=0; i<sub->num_rects; i++) {
54 char ass_line[2048];
55 const char *ass = sub->rects[i]->ass;
56
57 if (sub->rects[i]->type != SUBTITLE_ASS) {
58 av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
59 return -1;
60 }
61
62 if (strncmp(ass, "Dialogue: ", 10)) {
63 av_log(avctx, AV_LOG_ERROR, "AVSubtitle rectangle ass \"%s\""
64 " does not look like a SSA markup\n", ass);
65 return AVERROR_INVALIDDATA;
66 }
67
68 if (avctx->codec->id == AV_CODEC_ID_ASS) {
69 long int layer;
70 char *p;
71
72 if (i > 0) {
73 av_log(avctx, AV_LOG_ERROR, "ASS encoder supports only one "
74 "ASS rectangle field.\n");
75 return AVERROR_INVALIDDATA;
76 }
77
78 ass += 10; // skip "Dialogue: "
79 /* parse Layer field. If it's a Marked field, the content
80 * will be "Marked=N" instead of the layer num, so we will
81 * have layer=0, which is fine. */
82 layer = strtol(ass, &p, 10);
83
84 #define SKIP_ENTRY(ptr) do { \
85 char *sep = strchr(ptr, ','); \
86 if (sep) \
87 ptr = sep + 1; \
88 } while (0)
89
90 SKIP_ENTRY(p); // skip layer or marked
91 SKIP_ENTRY(p); // skip start timestamp
92 SKIP_ENTRY(p); // skip end timestamp
93 snprintf(ass_line, sizeof(ass_line), "%d,%ld,%s", ++s->id, layer, p);
94 ass_line[strcspn(ass_line, "\r\n")] = 0;
95 ass = ass_line;
96 }
97 len = av_strlcpy(buf+total_len, ass, bufsize-total_len);
98
99 if (len > bufsize-total_len-1) {
100 av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
101 return -1;
102 }
103
104 total_len += len;
105 }
106
107 return total_len;
108 }
109
110 #if CONFIG_SSA_ENCODER
111 AVCodec ff_ssa_encoder = {
112 .name = "ssa",
113 .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
114 .type = AVMEDIA_TYPE_SUBTITLE,
115 .id = AV_CODEC_ID_SSA,
116 .init = ass_encode_init,
117 .encode_sub = ass_encode_frame,
118 .priv_data_size = sizeof(ASSEncodeContext),
119 };
120 #endif
121
122 #if CONFIG_ASS_ENCODER
123 AVCodec ff_ass_encoder = {
124 .name = "ass",
125 .long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
126 .type = AVMEDIA_TYPE_SUBTITLE,
127 .id = AV_CODEC_ID_ASS,
128 .init = ass_encode_init,
129 .encode_sub = ass_encode_frame,
130 .priv_data_size = sizeof(ASSEncodeContext),
131 };
132 #endif