0,0 → 1,137 |
/* |
* 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) |
{ |
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); |
} |
|
res = avpriv_bprint_to_extradata(st->codec, &hdr_buf); |
if (res < 0) |
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_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", |
}; |