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109 lines
3.2 KiB
109 lines
3.2 KiB
/* |
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* Adobe Filmstrip demuxer |
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* Copyright (c) 2010 Peter Ross |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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* Adobe Filmstrip demuxer |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#define RAND_TAG MKBETAG('R','a','n','d') |
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typedef struct { |
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int leading; |
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} FilmstripDemuxContext; |
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static int read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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FilmstripDemuxContext *film = s->priv_data; |
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AVIOContext *pb = s->pb; |
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AVStream *st; |
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if (!s->pb->seekable) |
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return AVERROR(EIO); |
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avio_seek(pb, avio_size(pb) - 36, SEEK_SET); |
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if (avio_rb32(pb) != RAND_TAG) { |
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av_log(s, AV_LOG_ERROR, "magic number not found"); |
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return AVERROR_INVALIDDATA; |
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} |
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st = av_new_stream(s, 0); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->nb_frames = avio_rb32(pb); |
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if (avio_rb16(pb) != 0) { |
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av_log_ask_for_sample(s, "unsupported packing method\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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avio_skip(pb, 2); |
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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st->codec->codec_id = CODEC_ID_RAWVIDEO; |
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st->codec->pix_fmt = PIX_FMT_RGBA; |
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st->codec->codec_tag = 0; /* no fourcc */ |
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st->codec->width = avio_rb16(pb); |
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st->codec->height = avio_rb16(pb); |
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film->leading = avio_rb16(pb); |
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av_set_pts_info(st, 64, 1, avio_rb16(pb)); |
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avio_seek(pb, 0, SEEK_SET); |
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return 0; |
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} |
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static int read_packet(AVFormatContext *s, |
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AVPacket *pkt) |
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{ |
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FilmstripDemuxContext *film = s->priv_data; |
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AVStream *st = s->streams[0]; |
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if (s->pb->eof_reached) |
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return AVERROR(EIO); |
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pkt->dts = avio_tell(s->pb) / (st->codec->width * (st->codec->height + film->leading) * 4); |
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pkt->size = av_get_packet(s->pb, pkt, st->codec->width * st->codec->height * 4); |
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avio_skip(s->pb, st->codec->width * film->leading * 4); |
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if (pkt->size < 0) |
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return pkt->size; |
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pkt->flags |= AV_PKT_FLAG_KEY; |
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return 0; |
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} |
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static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
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{ |
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AVStream *st = s->streams[stream_index]; |
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avio_seek(s->pb, FFMAX(timestamp, 0) * st->codec->width * st->codec->height * 4, SEEK_SET); |
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return 0; |
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} |
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AVInputFormat ff_filmstrip_demuxer = { |
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.name = "filmstrip", |
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.long_name = NULL_IF_CONFIG_SMALL("Adobe Filmstrip"), |
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.priv_data_size = sizeof(FilmstripDemuxContext), |
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.read_header = read_header, |
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.read_packet = read_packet, |
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.read_seek = read_seek, |
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.extensions = "flm", |
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};
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