diff options
author | Clément Bœsch <ubitux@gmail.com> | 2012-06-17 11:42:47 +0200 |
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committer | Clément Bœsch <ubitux@gmail.com> | 2012-06-29 20:21:28 +0200 |
commit | 53640f42be9f18368a8339116f8abf30616c60b2 (patch) | |
tree | 806c126d4494c863859c003774d48312c37dd8b5 /libavformat/samidec.c | |
parent | d948893dbd963a268e2fc093b3d09b5037560974 (diff) | |
download | ffmpeg-53640f42be9f18368a8339116f8abf30616c60b2.tar.gz |
SAMI demuxer and decoder.
Diffstat (limited to 'libavformat/samidec.c')
-rw-r--r-- | libavformat/samidec.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/libavformat/samidec.c b/libavformat/samidec.c new file mode 100644 index 0000000000..5995d86fcf --- /dev/null +++ b/libavformat/samidec.c @@ -0,0 +1,132 @@ +/* + * 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 = 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", +}; |