| /* |
| * SSA/ASS encoder |
| * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <string.h> |
| |
| #include "avcodec.h" |
| #include "ass.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/internal.h" |
| #include "libavutil/mem.h" |
| |
| typedef struct { |
| int id; ///< current event id, ReadOrder field |
| } ASSEncodeContext; |
| |
| static av_cold int ass_encode_init(AVCodecContext *avctx) |
| { |
| avctx->extradata = av_malloc(avctx->subtitle_header_size + 1); |
| if (!avctx->extradata) |
| return AVERROR(ENOMEM); |
| memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size); |
| avctx->extradata_size = avctx->subtitle_header_size; |
| avctx->extradata[avctx->extradata_size] = 0; |
| return 0; |
| } |
| |
| static int ass_encode_frame(AVCodecContext *avctx, |
| unsigned char *buf, int bufsize, |
| const AVSubtitle *sub) |
| { |
| ASSEncodeContext *s = avctx->priv_data; |
| int i, len, total_len = 0; |
| |
| for (i=0; i<sub->num_rects; i++) { |
| char ass_line[2048]; |
| const char *ass = sub->rects[i]->ass; |
| long int layer; |
| char *p; |
| |
| if (sub->rects[i]->type != SUBTITLE_ASS) { |
| av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| #if FF_API_ASS_TIMING |
| if (!strncmp(ass, "Dialogue: ", 10)) { |
| if (i > 0) { |
| av_log(avctx, AV_LOG_ERROR, "ASS encoder supports only one " |
| "ASS rectangle field.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| ass += 10; // skip "Dialogue: " |
| /* parse Layer field. If it's a Marked field, the content |
| * will be "Marked=N" instead of the layer num, so we will |
| * have layer=0, which is fine. */ |
| layer = strtol(ass, &p, 10); |
| |
| #define SKIP_ENTRY(ptr) do { \ |
| char *sep = strchr(ptr, ','); \ |
| if (sep) \ |
| ptr = sep + 1; \ |
| } while (0) |
| |
| SKIP_ENTRY(p); // skip layer or marked |
| SKIP_ENTRY(p); // skip start timestamp |
| SKIP_ENTRY(p); // skip end timestamp |
| snprintf(ass_line, sizeof(ass_line), "%d,%ld,%s", ++s->id, layer, p); |
| ass_line[strcspn(ass_line, "\r\n")] = 0; |
| ass = ass_line; |
| } |
| #endif |
| |
| len = av_strlcpy(buf+total_len, ass, bufsize-total_len); |
| |
| if (len > bufsize-total_len-1) { |
| av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n"); |
| return AVERROR_BUFFER_TOO_SMALL; |
| } |
| |
| total_len += len; |
| } |
| |
| return total_len; |
| } |
| |
| #if CONFIG_SSA_ENCODER |
| AVCodec ff_ssa_encoder = { |
| .name = "ssa", |
| .long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), |
| .type = AVMEDIA_TYPE_SUBTITLE, |
| .id = AV_CODEC_ID_ASS, |
| .init = ass_encode_init, |
| .encode_sub = ass_encode_frame, |
| .priv_data_size = sizeof(ASSEncodeContext), |
| }; |
| #endif |
| |
| #if CONFIG_ASS_ENCODER |
| AVCodec ff_ass_encoder = { |
| .name = "ass", |
| .long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), |
| .type = AVMEDIA_TYPE_SUBTITLE, |
| .id = AV_CODEC_ID_ASS, |
| .init = ass_encode_init, |
| .encode_sub = ass_encode_frame, |
| .priv_data_size = sizeof(ASSEncodeContext), |
| }; |
| #endif |