mirror of
https://github.com/FFmpeg/FFmpeg.git
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138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
/*
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* Copyright (c) 2012 Clément Bœsch
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* SAMI subtitle demuxer
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* @see http://msdn.microsoft.com/en-us/library/ms971327.aspx
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "subtitles.h"
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#include "libavcodec/internal.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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#include "libavutil/intreadwrite.h"
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typedef struct {
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FFDemuxSubtitlesQueue q;
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} SAMIContext;
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static int sami_probe(AVProbeData *p)
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{
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const unsigned char *ptr = p->buf;
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if (AV_RB24(ptr) == 0xEFBBBF)
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ptr += 3; /* skip UTF-8 BOM */
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return !strncmp(ptr, "<SAMI>", 6) ? AVPROBE_SCORE_MAX : 0;
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}
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static int sami_read_header(AVFormatContext *s)
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{
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SAMIContext *sami = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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AVBPrint buf, hdr_buf;
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char c = 0;
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int res = 0, got_first_sync_point = 0;
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if (!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 64, 1, 1000);
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st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codec->codec_id = AV_CODEC_ID_SAMI;
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av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
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av_bprint_init(&hdr_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
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while (!url_feof(s->pb)) {
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AVPacket *sub;
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const int64_t pos = avio_tell(s->pb) - (c != 0);
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int is_sync, n = ff_smil_extract_next_chunk(s->pb, &buf, &c);
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if (n == 0)
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break;
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is_sync = !av_strncasecmp(buf.str, "<SYNC", 5);
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if (is_sync)
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got_first_sync_point = 1;
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if (!got_first_sync_point) {
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av_bprintf(&hdr_buf, "%s", buf.str);
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} else {
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sub = ff_subtitles_queue_insert(&sami->q, buf.str, buf.len, !is_sync);
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if (!sub) {
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res = AVERROR(ENOMEM);
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goto end;
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}
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if (is_sync) {
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const char *p = ff_smil_get_attr_ptr(buf.str, "Start");
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sub->pos = pos;
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sub->pts = p ? strtol(p, NULL, 10) : 0;
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sub->duration = -1;
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}
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}
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av_bprint_clear(&buf);
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}
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res = avpriv_bprint_to_extradata(st->codec, &hdr_buf);
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if (res < 0)
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goto end;
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ff_subtitles_queue_finalize(&sami->q);
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end:
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av_bprint_finalize(&buf, NULL);
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return res;
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}
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static int sami_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SAMIContext *sami = s->priv_data;
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return ff_subtitles_queue_read_packet(&sami->q, pkt);
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}
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static int sami_read_seek(AVFormatContext *s, int stream_index,
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int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
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{
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SAMIContext *sami = s->priv_data;
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return ff_subtitles_queue_seek(&sami->q, s, stream_index,
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min_ts, ts, max_ts, flags);
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}
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static int sami_read_close(AVFormatContext *s)
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{
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SAMIContext *sami = s->priv_data;
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ff_subtitles_queue_clean(&sami->q);
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return 0;
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}
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AVInputFormat ff_sami_demuxer = {
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.name = "sami",
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.long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle format"),
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.priv_data_size = sizeof(SAMIContext),
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.read_probe = sami_probe,
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.read_header = sami_read_header,
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.read_packet = sami_read_packet,
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.read_seek2 = sami_read_seek,
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.read_close = sami_read_close,
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.extensions = "smi,sami",
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};
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