blob: 3178f2953ca6a73a8a641aca7995ab400af40b53
| 1 | /* |
| 2 | * SSA/ASS decoder |
| 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.h" |
| 26 | #include "libavutil/internal.h" |
| 27 | #include "libavutil/mem.h" |
| 28 | |
| 29 | static av_cold int ass_decode_init(AVCodecContext *avctx) |
| 30 | { |
| 31 | avctx->subtitle_header = av_malloc(avctx->extradata_size + 1); |
| 32 | if (!avctx->subtitle_header) |
| 33 | return AVERROR(ENOMEM); |
| 34 | memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size); |
| 35 | avctx->subtitle_header[avctx->extradata_size] = 0; |
| 36 | avctx->subtitle_header_size = avctx->extradata_size; |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, |
| 41 | AVPacket *avpkt) |
| 42 | { |
| 43 | AVSubtitle *sub = data; |
| 44 | |
| 45 | if (avpkt->size <= 0) |
| 46 | return avpkt->size; |
| 47 | |
| 48 | sub->rects = av_malloc(sizeof(*sub->rects)); |
| 49 | if (!sub->rects) |
| 50 | return AVERROR(ENOMEM); |
| 51 | sub->rects[0] = av_mallocz(sizeof(*sub->rects[0])); |
| 52 | if (!sub->rects[0]) |
| 53 | return AVERROR(ENOMEM); |
| 54 | sub->num_rects = 1; |
| 55 | sub->rects[0]->type = SUBTITLE_ASS; |
| 56 | sub->rects[0]->ass = av_strdup(avpkt->data); |
| 57 | if (!sub->rects[0]->ass) |
| 58 | return AVERROR(ENOMEM); |
| 59 | *got_sub_ptr = 1; |
| 60 | return avpkt->size; |
| 61 | } |
| 62 | |
| 63 | #if CONFIG_SSA_DECODER |
| 64 | AVCodec ff_ssa_decoder = { |
| 65 | .name = "ssa", |
| 66 | .long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), |
| 67 | .type = AVMEDIA_TYPE_SUBTITLE, |
| 68 | .id = AV_CODEC_ID_ASS, |
| 69 | .init = ass_decode_init, |
| 70 | .decode = ass_decode_frame, |
| 71 | }; |
| 72 | #endif |
| 73 | |
| 74 | #if CONFIG_ASS_DECODER |
| 75 | AVCodec ff_ass_decoder = { |
| 76 | .name = "ass", |
| 77 | .long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), |
| 78 | .type = AVMEDIA_TYPE_SUBTITLE, |
| 79 | .id = AV_CODEC_ID_ASS, |
| 80 | .init = ass_decode_init, |
| 81 | .decode = ass_decode_frame, |
| 82 | }; |
| 83 | #endif |
| 84 |