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96 lines
2.8 KiB
96 lines
2.8 KiB
/* |
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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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