/* * Copyright (c) 2012 Clément Bœsch * * 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 */ /** * @file * SAMI subtitle demuxer * @see http://msdn.microsoft.com/en-us/library/ms971327.aspx */ #include "avformat.h" #include "internal.h" #include "subtitles.h" #include "libavutil/avstring.h" #include "libavutil/bprint.h" #include "libavutil/intreadwrite.h" typedef struct { FFDemuxSubtitlesQueue q; } SAMIContext; static int sami_probe(AVProbeData *p) { const unsigned char *ptr = p->buf; if (AV_RB24(ptr) == 0xEFBBBF) ptr += 3; /* skip UTF-8 BOM */ return !strncmp(ptr, "<SAMI>", 6) ? AVPROBE_SCORE_MAX : 0; } static int sami_read_header(AVFormatContext *s) { SAMIContext *sami = s->priv_data; AVStream *st = avformat_new_stream(s, NULL); AVBPrint buf, hdr_buf; char c = 0; int res = 0, got_first_sync_point = 0; if (!st) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 64, 1, 1000); st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; st->codec->codec_id = AV_CODEC_ID_SAMI; av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); av_bprint_init(&hdr_buf, 0, AV_BPRINT_SIZE_UNLIMITED); while (!url_feof(s->pb)) { AVPacket *sub; const int64_t pos = avio_tell(s->pb) - (c != 0); int is_sync, n = ff_smil_extract_next_chunk(s->pb, &buf, &c); if (n == 0) break; is_sync = !av_strncasecmp(buf.str, "<SYNC", 5); if (is_sync) got_first_sync_point = 1; if (!got_first_sync_point) { av_bprintf(&hdr_buf, "%s", buf.str); } else { sub = ff_subtitles_queue_insert(&sami->q, buf.str, buf.len, !is_sync); if (!sub) { res = AVERROR(ENOMEM); goto end; } if (is_sync) { const char *p = ff_smil_get_attr_ptr(buf.str, "Start"); sub->pos = pos; sub->pts = p ? strtol(p, NULL, 10) : 0; sub->duration = -1; } } av_bprint_clear(&buf); } st->codec->extradata_size = hdr_buf.len + 1; av_bprint_finalize(&hdr_buf, (char **)&st->codec->extradata); if (!st->codec->extradata) { st->codec->extradata_size = 0; res = AVERROR(ENOMEM); goto end; } ff_subtitles_queue_finalize(&sami->q); end: av_bprint_finalize(&buf, NULL); return res; } static int sami_read_packet(AVFormatContext *s, AVPacket *pkt) { SAMIContext *sami = s->priv_data; return ff_subtitles_queue_read_packet(&sami->q, pkt); } static int sami_read_close(AVFormatContext *s) { SAMIContext *sami = s->priv_data; ff_subtitles_queue_clean(&sami->q); return 0; } AVInputFormat ff_sami_demuxer = { .name = "sami", .long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle format"), .priv_data_size = sizeof(SAMIContext), .read_probe = sami_probe, .read_header = sami_read_header, .read_packet = sami_read_packet, .read_close = sami_read_close, .flags = AVFMT_GENERIC_INDEX, .extensions = "smi,sami", };