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2cae9809e2
* qatar/master: fate: fix partial run when no samples path is specified ARM: NEON fixed-point forward MDCT ARM: NEON fixed-point FFT lavf: bump minor version and add an APIChanges entry for avio changes avio: simplify url_open_dyn_buf_internal by using avio_alloc_context() avio: make url_fdopen internal. avio: make url_open_dyn_packet_buf internal. avio: avio_ prefix for url_close_dyn_buf avio: avio_ prefix for url_open_dyn_buf avio: introduce an AVIOContext.seekable field ac3enc: use generic fixed-point mdct lavfi: add fade filter Change yadif to not use out of picture lines. lavc: deprecate AVCodecContext.antialias_algo lavc: mark mb_qmin/mb_qmax for removal on next major bump. Conflicts: doc/filters.texi libavcodec/ac3enc_fixed.h libavcodec/ac3enc_float.h libavfilter/Makefile libavfilter/allfilters.c libavfilter/vf_fade.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 (url_feof(s->pb))
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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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"filmstrip",
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NULL_IF_CONFIG_SMALL("Adobe Filmstrip"),
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sizeof(FilmstripDemuxContext),
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NULL,
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read_header,
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read_packet,
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NULL,
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read_seek,
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.extensions = "flm",
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};
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