| /* |
| * DERF demuxer |
| * Copyright (c) 2020 Paul B Mahol |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "pcm.h" |
| |
| static int derf_probe(const AVProbeData *p) |
| { |
| if (AV_RL32(p->buf) != MKTAG('D','E','R','F')) |
| return 0; |
| if (AV_RL32(p->buf+4) != 1 && AV_RL32(p->buf+4) != 2) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX / 3 * 2; |
| } |
| |
| static int derf_read_header(AVFormatContext *s) |
| { |
| unsigned data_size; |
| AVIOContext *pb = s->pb; |
| AVCodecParameters *par; |
| AVStream *st; |
| |
| avio_skip(pb, 4); |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| par = st->codecpar; |
| par->codec_type = AVMEDIA_TYPE_AUDIO; |
| par->codec_id = AV_CODEC_ID_DERF_DPCM; |
| par->format = AV_SAMPLE_FMT_S16; |
| par->channels = avio_rl32(pb); |
| if (par->channels != 1 && par->channels != 2) |
| return AVERROR_INVALIDDATA; |
| if (par->channels == 1) |
| par->channel_layout = AV_CH_LAYOUT_MONO; |
| else if (par->channels == 2) |
| par->channel_layout = AV_CH_LAYOUT_STEREO; |
| data_size = avio_rl32(pb); |
| st->duration = data_size / par->channels; |
| par->sample_rate = 22050; |
| par->block_align = 1; |
| |
| avpriv_set_pts_info(st, 64, 1, par->sample_rate); |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_derf_demuxer = { |
| .name = "derf", |
| .long_name = NULL_IF_CONFIG_SMALL("Xilam DERF"), |
| .read_probe = derf_probe, |
| .read_header = derf_read_header, |
| .read_packet = ff_pcm_read_packet, |
| .read_seek = ff_pcm_read_seek, |
| .extensions = "adp", |
| }; |