Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2012 Clément Bœsch |
||
| 3 | * |
||
| 4 | * This file is part of FFmpeg. |
||
| 5 | * |
||
| 6 | * FFmpeg is free software; you can redistribute it and/or |
||
| 7 | * modify it under the terms of the GNU Lesser General Public |
||
| 8 | * License as published by the Free Software Foundation; either |
||
| 9 | * version 2.1 of the License, or (at your option) any later version. |
||
| 10 | * |
||
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
||
| 14 | * Lesser General Public License for more details. |
||
| 15 | * |
||
| 16 | * You should have received a copy of the GNU Lesser General Public |
||
| 17 | * License along with FFmpeg; if not, write to the Free Software |
||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||
| 19 | */ |
||
| 20 | |||
| 21 | /** |
||
| 22 | * @file |
||
| 23 | * SAMI subtitle demuxer |
||
| 24 | * @see http://msdn.microsoft.com/en-us/library/ms971327.aspx |
||
| 25 | */ |
||
| 26 | |||
| 27 | #include "avformat.h" |
||
| 28 | #include "internal.h" |
||
| 29 | #include "subtitles.h" |
||
| 30 | #include "libavcodec/internal.h" |
||
| 31 | #include "libavutil/avstring.h" |
||
| 32 | #include "libavutil/bprint.h" |
||
| 33 | #include "libavutil/intreadwrite.h" |
||
| 34 | |||
| 35 | typedef struct { |
||
| 36 | FFDemuxSubtitlesQueue q; |
||
| 37 | } SAMIContext; |
||
| 38 | |||
| 39 | static int sami_probe(AVProbeData *p) |
||
| 40 | { |
||
| 41 | const unsigned char *ptr = p->buf; |
||
| 42 | |||
| 43 | if (AV_RB24(ptr) == 0xEFBBBF) |
||
| 44 | ptr += 3; /* skip UTF-8 BOM */ |
||
| 45 | return !strncmp(ptr, " |
||
| 46 | } |
||
| 47 | |||
| 48 | static int sami_read_header(AVFormatContext *s) |
||
| 49 | { |
||
| 50 | SAMIContext *sami = s->priv_data; |
||
| 51 | AVStream *st = avformat_new_stream(s, NULL); |
||
| 52 | AVBPrint buf, hdr_buf; |
||
| 53 | char c = 0; |
||
| 54 | int res = 0, got_first_sync_point = 0; |
||
| 55 | |||
| 56 | if (!st) |
||
| 57 | return AVERROR(ENOMEM); |
||
| 58 | avpriv_set_pts_info(st, 64, 1, 1000); |
||
| 59 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
||
| 60 | st->codec->codec_id = AV_CODEC_ID_SAMI; |
||
| 61 | |||
| 62 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
||
| 63 | av_bprint_init(&hdr_buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
||
| 64 | |||
| 65 | while (!url_feof(s->pb)) { |
||
| 66 | AVPacket *sub; |
||
| 67 | const int64_t pos = avio_tell(s->pb) - (c != 0); |
||
| 68 | int is_sync, n = ff_smil_extract_next_chunk(s->pb, &buf, &c); |
||
| 69 | |||
| 70 | if (n == 0) |
||
| 71 | break; |
||
| 72 | |||
| 73 | is_sync = !av_strncasecmp(buf.str, " |
||
| 74 | if (is_sync) |
||
| 75 | got_first_sync_point = 1; |
||
| 76 | |||
| 77 | if (!got_first_sync_point) { |
||
| 78 | av_bprintf(&hdr_buf, "%s", buf.str); |
||
| 79 | } else { |
||
| 80 | sub = ff_subtitles_queue_insert(&sami->q, buf.str, buf.len, !is_sync); |
||
| 81 | if (!sub) { |
||
| 82 | res = AVERROR(ENOMEM); |
||
| 83 | goto end; |
||
| 84 | } |
||
| 85 | if (is_sync) { |
||
| 86 | const char *p = ff_smil_get_attr_ptr(buf.str, "Start"); |
||
| 87 | sub->pos = pos; |
||
| 88 | sub->pts = p ? strtol(p, NULL, 10) : 0; |
||
| 89 | sub->duration = -1; |
||
| 90 | } |
||
| 91 | } |
||
| 92 | av_bprint_clear(&buf); |
||
| 93 | } |
||
| 94 | |||
| 95 | res = avpriv_bprint_to_extradata(st->codec, &hdr_buf); |
||
| 96 | if (res < 0) |
||
| 97 | goto end; |
||
| 98 | |||
| 99 | ff_subtitles_queue_finalize(&sami->q); |
||
| 100 | |||
| 101 | end: |
||
| 102 | av_bprint_finalize(&buf, NULL); |
||
| 103 | return res; |
||
| 104 | } |
||
| 105 | |||
| 106 | static int sami_read_packet(AVFormatContext *s, AVPacket *pkt) |
||
| 107 | { |
||
| 108 | SAMIContext *sami = s->priv_data; |
||
| 109 | return ff_subtitles_queue_read_packet(&sami->q, pkt); |
||
| 110 | } |
||
| 111 | |||
| 112 | static int sami_read_seek(AVFormatContext *s, int stream_index, |
||
| 113 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
||
| 114 | { |
||
| 115 | SAMIContext *sami = s->priv_data; |
||
| 116 | return ff_subtitles_queue_seek(&sami->q, s, stream_index, |
||
| 117 | min_ts, ts, max_ts, flags); |
||
| 118 | } |
||
| 119 | |||
| 120 | static int sami_read_close(AVFormatContext *s) |
||
| 121 | { |
||
| 122 | SAMIContext *sami = s->priv_data; |
||
| 123 | ff_subtitles_queue_clean(&sami->q); |
||
| 124 | return 0; |
||
| 125 | } |
||
| 126 | |||
| 127 | AVInputFormat ff_sami_demuxer = { |
||
| 128 | .name = "sami", |
||
| 129 | .long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle format"), |
||
| 130 | .priv_data_size = sizeof(SAMIContext), |
||
| 131 | .read_probe = sami_probe, |
||
| 132 | .read_header = sami_read_header, |
||
| 133 | .read_packet = sami_read_packet, |
||
| 134 | .read_seek2 = sami_read_seek, |
||
| 135 | .read_close = sami_read_close, |
||
| 136 | .extensions = "smi,sami", |
||
| 137 | }; |