mirror of https://git.videolan.org/git/ffmpeg.git
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*
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* SDNS demuxer
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* Copyright (c) 2023 Paul B Mahol
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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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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "demux.h"
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#include "internal.h"
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static int sdns_probe(const AVProbeData *p)
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{
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if (AV_RL32(p->buf) != MKTAG('S','D','N','S'))
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return 0;
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if (AV_RB32(p->buf + 8) <= 0)
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return 0;
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if (AV_RB32(p->buf + 12) <= 0 ||
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AV_RB32(p->buf + 12) > 128)
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return 0;
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return AVPROBE_SCORE_MAX / 3;
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}
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static int sdns_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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AVCodecParameters *par;
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int channels, ret;
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AVStream *st;
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avio_skip(pb, 8);
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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par = st->codecpar;
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par->codec_type = AVMEDIA_TYPE_AUDIO;
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par->codec_id = AV_CODEC_ID_XMA1;
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par->sample_rate = avio_rb32(pb);
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channels = avio_rb32(pb);
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if (channels <= 0 || channels > 128)
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return AVERROR_INVALIDDATA;
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av_channel_layout_default(&par->ch_layout, channels);
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if (par->sample_rate <= 0)
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return AVERROR_INVALIDDATA;
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par->block_align = 2048;
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if ((ret = ff_alloc_extradata(par, 8 + 20 * ((channels + 1) / 2))) < 0)
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return ret;
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memset(par->extradata, 0, 28);
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par->extradata[4] = (channels + 1) / 2;
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for (int i = 0; i < par->extradata[4]; i++)
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par->extradata[8 + 20 * i + 17] = FFMIN(2, channels - i * 2);
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avpriv_set_pts_info(st, 64, 1, par->sample_rate);
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avio_seek(pb, 0x1000, SEEK_SET);
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return 0;
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}
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static int sdns_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret;
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if (avio_feof(s->pb))
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return AVERROR_EOF;
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ret = av_get_packet(s->pb, pkt, 2048);
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pkt->stream_index = 0;
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return ret;
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}
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const FFInputFormat ff_sdns_demuxer = {
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.p.name = "sdns",
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.p.long_name = NULL_IF_CONFIG_SMALL("Xbox SDNS"),
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.p.flags = AVFMT_GENERIC_INDEX,
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.p.extensions = "sdns",
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.read_probe = sdns_probe,
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.read_header = sdns_read_header,
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.read_packet = sdns_read_packet,
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};
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