| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Adobe Filmstrip demuxer | ||
| 3 | * Copyright (c) 2010 Peter Ross | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | /** | ||
| 23 | * @file | ||
| 24 | * Adobe Filmstrip demuxer | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "libavutil/intreadwrite.h" | ||
| 28 | #include "libavutil/imgutils.h" | ||
| 29 | #include "avformat.h" | ||
| 30 | #include "demux.h" | ||
| 31 | #include "internal.h" | ||
| 32 | |||
| 33 | #define RAND_TAG MKBETAG('R','a','n','d') | ||
| 34 | |||
| 35 | typedef struct FilmstripDemuxContext { | ||
| 36 | int leading; | ||
| 37 | } FilmstripDemuxContext; | ||
| 38 | |||
| 39 | 1 | static int read_header(AVFormatContext *s) | |
| 40 | { | ||
| 41 | 1 | FilmstripDemuxContext *film = s->priv_data; | |
| 42 | 1 | AVIOContext *pb = s->pb; | |
| 43 | AVStream *st; | ||
| 44 | |||
| 45 |
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1 | if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) |
| 46 | ✗ | return AVERROR(EIO); | |
| 47 | |||
| 48 | 1 | avio_seek(pb, avio_size(pb) - 36, SEEK_SET); | |
| 49 |
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1 | if (avio_rb32(pb) != RAND_TAG) { |
| 50 | ✗ | av_log(s, AV_LOG_ERROR, "magic number not found\n"); | |
| 51 | ✗ | return AVERROR_INVALIDDATA; | |
| 52 | } | ||
| 53 | |||
| 54 | 1 | st = avformat_new_stream(s, NULL); | |
| 55 |
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1 | if (!st) |
| 56 | ✗ | return AVERROR(ENOMEM); | |
| 57 | |||
| 58 | 1 | st->nb_frames = avio_rb32(pb); | |
| 59 |
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1 | if (avio_rb16(pb) != 0) { |
| 60 | ✗ | avpriv_request_sample(s, "Unsupported packing method"); | |
| 61 | ✗ | return AVERROR_PATCHWELCOME; | |
| 62 | } | ||
| 63 | |||
| 64 | 1 | avio_skip(pb, 2); | |
| 65 | 1 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 66 | 1 | st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO; | |
| 67 | 1 | st->codecpar->format = AV_PIX_FMT_RGBA; | |
| 68 | 1 | st->codecpar->codec_tag = 0; /* no fourcc */ | |
| 69 | 1 | st->codecpar->width = avio_rb16(pb); | |
| 70 | 1 | st->codecpar->height = avio_rb16(pb); | |
| 71 | 1 | film->leading = avio_rb16(pb); | |
| 72 | |||
| 73 |
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1 | if (av_image_check_size(st->codecpar->width, st->codecpar->height, 0, s) < 0) |
| 74 | ✗ | return AVERROR_INVALIDDATA; | |
| 75 | |||
| 76 | 1 | avpriv_set_pts_info(st, 64, 1, avio_rb16(pb)); | |
| 77 | |||
| 78 | 1 | avio_seek(pb, 0, SEEK_SET); | |
| 79 | |||
| 80 | 1 | return 0; | |
| 81 | } | ||
| 82 | |||
| 83 | 27 | static int read_packet(AVFormatContext *s, | |
| 84 | AVPacket *pkt) | ||
| 85 | { | ||
| 86 | 27 | FilmstripDemuxContext *film = s->priv_data; | |
| 87 | 27 | AVStream *st = s->streams[0]; | |
| 88 | |||
| 89 |
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27 | if (avio_feof(s->pb)) |
| 90 | 1 | return AVERROR_EOF; | |
| 91 | 26 | pkt->dts = avio_tell(s->pb) / (st->codecpar->width * (int64_t)(st->codecpar->height + film->leading) * 4); | |
| 92 | 26 | pkt->size = av_get_packet(s->pb, pkt, st->codecpar->width * st->codecpar->height * 4); | |
| 93 | 26 | avio_skip(s->pb, st->codecpar->width * (int64_t) film->leading * 4); | |
| 94 |
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26 | if (pkt->size < 0) |
| 95 | ✗ | return pkt->size; | |
| 96 | 26 | pkt->flags |= AV_PKT_FLAG_KEY; | |
| 97 | 26 | return 0; | |
| 98 | } | ||
| 99 | |||
| 100 | ✗ | static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) | |
| 101 | { | ||
| 102 | ✗ | AVStream *st = s->streams[stream_index]; | |
| 103 | ✗ | if (avio_seek(s->pb, FFMAX(timestamp, 0) * st->codecpar->width * st->codecpar->height * 4, SEEK_SET) < 0) | |
| 104 | ✗ | return -1; | |
| 105 | ✗ | return 0; | |
| 106 | } | ||
| 107 | |||
| 108 | const FFInputFormat ff_filmstrip_demuxer = { | ||
| 109 | .p.name = "filmstrip", | ||
| 110 | .p.long_name = NULL_IF_CONFIG_SMALL("Adobe Filmstrip"), | ||
| 111 | .p.extensions = "flm", | ||
| 112 | .priv_data_size = sizeof(FilmstripDemuxContext), | ||
| 113 | .read_header = read_header, | ||
| 114 | .read_packet = read_packet, | ||
| 115 | .read_seek = read_seek, | ||
| 116 | }; | ||
| 117 |