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| 1 | +/* |
| 2 | + * XMD demuxer |
| 3 | + * Copyright (c) 2023 Paul B Mahol |
| 4 | + * |
| 5 | + * This file is part of FFmpeg. |
| 6 | + * |
| 7 | + * FFmpeg is free software; you can redistribute it and/or |
| 8 | + * modify it under the terms of the GNU Lesser General Public |
| 9 | + * License as published by the Free Software Foundation; either |
| 10 | + * version 2.1 of the License, or (at your option) any later version. |
| 11 | + * |
| 12 | + * FFmpeg is distributed in the hope that it will be useful, |
| 13 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | + * Lesser General Public License for more details. |
| 16 | + * |
| 17 | + * You should have received a copy of the GNU Lesser General Public |
| 18 | + * License along with FFmpeg; if not, write to the Free Software |
| 19 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | + */ |
| 21 | + |
| 22 | +#include "libavutil/channel_layout.h" |
| 23 | +#include "libavutil/intreadwrite.h" |
| 24 | +#include "avformat.h" |
| 25 | +#include "demux.h" |
| 26 | +#include "internal.h" |
| 27 | +#include "pcm.h" |
| 28 | + |
| 29 | +static int xmd_probe(const AVProbeData *p) |
| 30 | +{ |
| 31 | + if ((AV_RL32(p->buf) & 0xFFFFFF) != MKTAG('x','m','d',0)) |
| 32 | + return 0; |
| 33 | + if (p->buf[3] == 0 || p->buf[3] > 2 || |
| 34 | + AV_RL16(p->buf+4) == 0 || |
| 35 | + AV_RL32(p->buf+6) == 0) |
| 36 | + return 0; |
| 37 | + |
| 38 | + return AVPROBE_SCORE_MAX / 3; |
| 39 | +} |
| 40 | + |
| 41 | +static int xmd_read_header(AVFormatContext *s) |
| 42 | +{ |
| 43 | + AVIOContext *pb = s->pb; |
| 44 | + AVCodecParameters *par; |
| 45 | + int channels; |
| 46 | + AVStream *st; |
| 47 | + |
| 48 | + avio_skip(pb, 3); |
| 49 | + |
| 50 | + st = avformat_new_stream(s, NULL); |
| 51 | + if (!st) |
| 52 | + return AVERROR(ENOMEM); |
| 53 | + |
| 54 | + par = st->codecpar; |
| 55 | + par->codec_type = AVMEDIA_TYPE_AUDIO; |
| 56 | + par->codec_id = AV_CODEC_ID_ADPCM_XMD; |
| 57 | + channels = avio_r8(pb); |
| 58 | + if (channels == 0) |
| 59 | + return AVERROR_INVALIDDATA; |
| 60 | + av_channel_layout_default(&par->ch_layout, channels); |
| 61 | + par->sample_rate = avio_rl16(pb); |
| 62 | + if (par->sample_rate <= 0) |
| 63 | + return AVERROR_INVALIDDATA; |
| 64 | + par->block_align = 21 * channels; |
| 65 | + st->duration = (avio_rl32(pb) / par->block_align) * 32LL; |
| 66 | + avpriv_set_pts_info(st, 64, 1, par->sample_rate); |
| 67 | + avio_skip(pb, 7); |
| 68 | + |
| 69 | + return 0; |
| 70 | +} |
| 71 | + |
| 72 | +const AVInputFormat ff_xmd_demuxer = { |
| 73 | + .name = "xmd", |
| 74 | + .long_name = NULL_IF_CONFIG_SMALL("Konami XMD"), |
| 75 | + .read_probe = xmd_probe, |
| 76 | + .read_header = xmd_read_header, |
| 77 | + .read_packet = ff_pcm_read_packet, |
| 78 | + .flags = AVFMT_GENERIC_INDEX, |
| 79 | + .extensions = "xmd", |
| 80 | +}; |