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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 | }; |