| /* |
| * Adobe Filmstrip demuxer |
| * Copyright (c) 2010 Peter Ross |
| * |
| * 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 |
| * Adobe Filmstrip demuxer |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/imgutils.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| #define RAND_TAG MKBETAG('R','a','n','d') |
| |
| typedef struct FilmstripDemuxContext { |
| int leading; |
| } FilmstripDemuxContext; |
| |
| static int read_header(AVFormatContext *s) |
| { |
| FilmstripDemuxContext *film = s->priv_data; |
| AVIOContext *pb = s->pb; |
| AVStream *st; |
| |
| if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) |
| return AVERROR(EIO); |
| |
| avio_seek(pb, avio_size(pb) - 36, SEEK_SET); |
| if (avio_rb32(pb) != RAND_TAG) { |
| av_log(s, AV_LOG_ERROR, "magic number not found\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->nb_frames = avio_rb32(pb); |
| if (avio_rb16(pb) != 0) { |
| avpriv_request_sample(s, "Unsupported packing method"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| avio_skip(pb, 2); |
| st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO; |
| st->codecpar->format = AV_PIX_FMT_RGBA; |
| st->codecpar->codec_tag = 0; /* no fourcc */ |
| st->codecpar->width = avio_rb16(pb); |
| st->codecpar->height = avio_rb16(pb); |
| film->leading = avio_rb16(pb); |
| |
| if (av_image_check_size(st->codecpar->width, st->codecpar->height, 0, s) < 0) |
| return AVERROR_INVALIDDATA; |
| |
| avpriv_set_pts_info(st, 64, 1, avio_rb16(pb)); |
| |
| avio_seek(pb, 0, SEEK_SET); |
| |
| return 0; |
| } |
| |
| static int read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| FilmstripDemuxContext *film = s->priv_data; |
| AVStream *st = s->streams[0]; |
| |
| if (avio_feof(s->pb)) |
| return AVERROR(EIO); |
| pkt->dts = avio_tell(s->pb) / (st->codecpar->width * (int64_t)(st->codecpar->height + film->leading) * 4); |
| pkt->size = av_get_packet(s->pb, pkt, st->codecpar->width * st->codecpar->height * 4); |
| avio_skip(s->pb, st->codecpar->width * (int64_t) film->leading * 4); |
| if (pkt->size < 0) |
| return pkt->size; |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| return 0; |
| } |
| |
| static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
| { |
| AVStream *st = s->streams[stream_index]; |
| if (avio_seek(s->pb, FFMAX(timestamp, 0) * st->codecpar->width * st->codecpar->height * 4, SEEK_SET) < 0) |
| return -1; |
| return 0; |
| } |
| |
| AVInputFormat ff_filmstrip_demuxer = { |
| .name = "filmstrip", |
| .long_name = NULL_IF_CONFIG_SMALL("Adobe Filmstrip"), |
| .priv_data_size = sizeof(FilmstripDemuxContext), |
| .read_header = read_header, |
| .read_packet = read_packet, |
| .read_seek = read_seek, |
| .extensions = "flm", |
| }; |