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80 lines
2.3 KiB
80 lines
2.3 KiB
/* |
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* XMD 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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#include "pcm.h" |
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static int xmd_probe(const AVProbeData *p) |
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{ |
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if ((AV_RL32(p->buf) & 0xFFFFFF) != MKTAG('x','m','d',0)) |
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return 0; |
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if (p->buf[3] == 0 || p->buf[3] > 2 || |
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AV_RL16(p->buf+4) == 0 || |
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AV_RL32(p->buf+6) == 0) |
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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 xmd_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; |
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AVStream *st; |
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avio_skip(pb, 3); |
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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_ADPCM_XMD; |
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channels = avio_r8(pb); |
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if (channels == 0) |
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return AVERROR_INVALIDDATA; |
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av_channel_layout_default(&par->ch_layout, channels); |
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par->sample_rate = avio_rl16(pb); |
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if (par->sample_rate <= 0) |
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return AVERROR_INVALIDDATA; |
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par->block_align = 21 * channels; |
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st->duration = (avio_rl32(pb) / par->block_align) * 32LL; |
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avpriv_set_pts_info(st, 64, 1, par->sample_rate); |
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avio_skip(pb, 7); |
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return 0; |
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} |
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const FFInputFormat ff_xmd_demuxer = { |
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.p.name = "xmd", |
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.p.long_name = NULL_IF_CONFIG_SMALL("Konami XMD"), |
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.p.flags = AVFMT_GENERIC_INDEX, |
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.p.extensions = "xmd", |
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.read_probe = xmd_probe, |
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.read_header = xmd_read_header, |
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.read_packet = ff_pcm_read_packet, |
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};
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