diff options
author | Paul B Mahol <onemda@gmail.com> | 2020-03-15 10:47:29 +0100 |
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committer | Paul B Mahol <onemda@gmail.com> | 2020-03-17 16:05:49 +0100 |
commit | 4f248a34c5736c47337195b232c9d4989a91ef08 (patch) | |
tree | cc90cce2d59bb38cc0e329cf2ebedb8114eb7d8b /libavformat/derf.c | |
parent | c6bbdba9cd8f022e1f697f624818431499d30fe1 (diff) |
avformat: add derf demuxer
Diffstat (limited to 'libavformat/derf.c')
-rw-r--r-- | libavformat/derf.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/libavformat/derf.c b/libavformat/derf.c new file mode 100644 index 0000000000..58bbf5b791 --- /dev/null +++ b/libavformat/derf.c @@ -0,0 +1,79 @@ +/* + * 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", +}; |