diff options
Diffstat (limited to 'libavformat/samidec.c')
| -rw-r--r-- | libavformat/samidec.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/libavformat/samidec.c b/libavformat/samidec.c new file mode 100644 index 0000000000..11c674ce19 --- /dev/null +++ b/libavformat/samidec.c @@ -0,0 +1,146 @@ +/* + * 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 "libavcodec/internal.h" +#include "libavutil/avstring.h" +#include "libavutil/bprint.h" +#include "libavutil/intreadwrite.h" + +typedef struct { + FFDemuxSubtitlesQueue q; +} SAMIContext; + +static int sami_probe(AVProbeData *p) +{ + char buf[6]; + FFTextReader tr; + ff_text_init_buf(&tr, p->buf, p->buf_size); + ff_text_read(&tr, buf, sizeof(buf)); + + return !strncmp(buf, "<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; + FFTextReader tr; + ff_text_init_avio(s, &tr, s->pb); + + 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 (!ff_text_eof(&tr)) { + AVPacket *sub; + const int64_t pos = ff_text_pos(&tr) - (c != 0); + int is_sync, is_body, n = ff_smil_extract_next_text_chunk(&tr, &buf, &c); + + if (n == 0) + break; + + is_body = !av_strncasecmp(buf.str, "</BODY", 6); + if (is_body) { + av_bprint_clear(&buf); + 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); + } + + res = avpriv_bprint_to_extradata(st->codec, &hdr_buf); + if (res < 0) + goto end; + + ff_subtitles_queue_finalize(s, &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_seek(AVFormatContext *s, int stream_index, + int64_t min_ts, int64_t ts, int64_t max_ts, int flags) +{ + SAMIContext *sami = s->priv_data; + return ff_subtitles_queue_seek(&sami->q, s, stream_index, + min_ts, ts, max_ts, flags); +} + +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_seek2 = sami_read_seek, + .read_close = sami_read_close, + .extensions = "smi,sami", +}; |