| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RCWT (Raw Captions With Time) demuxer | ||
| 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 | * RCWT (Raw Captions With Time) is a format native to ccextractor, a commonly | ||
| 23 | * used open source tool for processing 608/708 Closed Captions (CC) sources. | ||
| 24 | * | ||
| 25 | * This demuxer implements the specification as of March 2024, which has | ||
| 26 | * been stable and unchanged since April 2014. | ||
| 27 | * | ||
| 28 | * A free specification of RCWT can be found here: | ||
| 29 | * @url{https://github.com/CCExtractor/ccextractor/blob/master/docs/BINARY_FILE_FORMAT.TXT} | ||
| 30 | */ | ||
| 31 | |||
| 32 | #include "avformat.h" | ||
| 33 | #include "demux.h" | ||
| 34 | #include "internal.h" | ||
| 35 | #include "subtitles.h" | ||
| 36 | #include "libavutil/intreadwrite.h" | ||
| 37 | |||
| 38 | #define RCWT_HEADER_SIZE 11 | ||
| 39 | |||
| 40 | typedef struct RCWTContext { | ||
| 41 | FFDemuxSubtitlesQueue q; | ||
| 42 | } RCWTContext; | ||
| 43 | |||
| 44 | ✗ | static int rcwt_read_header(AVFormatContext *avf) | |
| 45 | { | ||
| 46 | ✗ | RCWTContext *rcwt = avf->priv_data; | |
| 47 | |||
| 48 | AVStream *st; | ||
| 49 | uint8_t header[RCWT_HEADER_SIZE]; | ||
| 50 | int ret; | ||
| 51 | |||
| 52 | /* read header */ | ||
| 53 | ✗ | ret = ffio_read_size(avf->pb, header, RCWT_HEADER_SIZE); | |
| 54 | ✗ | if (ret < 0) | |
| 55 | ✗ | return ret; | |
| 56 | |||
| 57 | ✗ | if (AV_RB16(header + 6) != 0x0001) { | |
| 58 | ✗ | av_log(avf, AV_LOG_ERROR, "RCWT format version is not compatible " | |
| 59 | "(only version 0.001 is known)\n"); | ||
| 60 | ✗ | return AVERROR_INVALIDDATA; | |
| 61 | } | ||
| 62 | |||
| 63 | ✗ | av_log(avf, AV_LOG_DEBUG, "RCWT writer application: %02X version: %02x\n", | |
| 64 | ✗ | header[3], header[5]); | |
| 65 | |||
| 66 | /* setup stream */ | ||
| 67 | ✗ | st = avformat_new_stream(avf, NULL); | |
| 68 | ✗ | if (!st) | |
| 69 | ✗ | return AVERROR(ENOMEM); | |
| 70 | |||
| 71 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
| 72 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_EIA_608; | |
| 73 | |||
| 74 | ✗ | avpriv_set_pts_info(st, 64, 1, 1000); | |
| 75 | |||
| 76 | /* demux */ | ||
| 77 | ✗ | while (!avio_feof(avf->pb)) { | |
| 78 | AVPacket *sub; | ||
| 79 | ✗ | int64_t cluster_pos = avio_tell(avf->pb); | |
| 80 | ✗ | int64_t cluster_pts = avio_rl64(avf->pb); | |
| 81 | ✗ | int cluster_nb_blocks = avio_rl16(avf->pb); | |
| 82 | |||
| 83 | ✗ | if (cluster_nb_blocks == 0) | |
| 84 | ✗ | continue; | |
| 85 | |||
| 86 | ✗ | sub = ff_subtitles_queue_insert(&rcwt->q, NULL, 0, 0); | |
| 87 | ✗ | if (!sub) | |
| 88 | ✗ | return AVERROR(ENOMEM); | |
| 89 | |||
| 90 | ✗ | ret = av_get_packet(avf->pb, sub, cluster_nb_blocks * 3); | |
| 91 | ✗ | if (ret < 0) | |
| 92 | ✗ | return ret; | |
| 93 | |||
| 94 | ✗ | sub->pos = cluster_pos; | |
| 95 | ✗ | sub->pts = cluster_pts; | |
| 96 | } | ||
| 97 | |||
| 98 | ✗ | ff_subtitles_queue_finalize(avf, &rcwt->q); | |
| 99 | |||
| 100 | ✗ | return 0; | |
| 101 | } | ||
| 102 | |||
| 103 | 7128 | static int rcwt_probe(const AVProbeData *p) | |
| 104 | { | ||
| 105 | 14256 | return p->buf_size > RCWT_HEADER_SIZE && | |
| 106 |
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7128 | AV_RB16(p->buf) == 0xCCCC && |
| 107 | ✗ | AV_RB8(p->buf + 2) == 0xED && | |
| 108 |
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14256 | AV_RB16(p->buf + 6) == 0x0001 ? 50 : 0; |
| 109 | } | ||
| 110 | |||
| 111 | const FFInputFormat ff_rcwt_demuxer = { | ||
| 112 | .p.name = "rcwt", | ||
| 113 | .p.long_name = NULL_IF_CONFIG_SMALL("RCWT (Raw Captions With Time)"), | ||
| 114 | .p.flags = AVFMT_TS_DISCONT, | ||
| 115 | .priv_data_size = sizeof(RCWTContext), | ||
| 116 | .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP, | ||
| 117 | .read_probe = rcwt_probe, | ||
| 118 | .read_header = rcwt_read_header, | ||
| 119 | .read_packet = ff_subtitles_read_packet, | ||
| 120 | .read_seek2 = ff_subtitles_read_seek, | ||
| 121 | .read_close = ff_subtitles_read_close | ||
| 122 | }; | ||
| 123 |