Paul B Mahol:
> Signed-off-by: Paul B Mahol <one...@gmail.com>
> ---
> libavformat/Makefile | 1 +
> libavformat/allformats.c | 1 +
> libavformat/derf.c | 79 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 81 insertions(+)
> create mode 100644 libavformat/derf.c
>
> diff --git a/libavformat/Makefile b/libavformat/Makefile
> index cd3e9163f5..27615cd746 100644
> --- a/libavformat/Makefile
> +++ b/libavformat/Makefile
> @@ -151,6 +151,7 @@ OBJS-$(CONFIG_DASH_DEMUXER) += dash.o
> dashdec.o
> OBJS-$(CONFIG_DAUD_DEMUXER) += dauddec.o
> OBJS-$(CONFIG_DAUD_MUXER) += daudenc.o
> OBJS-$(CONFIG_DCSTR_DEMUXER) += dcstr.o
> +OBJS-$(CONFIG_DERF_DEMUXER) += derf.o
> OBJS-$(CONFIG_DFA_DEMUXER) += dfa.o
> OBJS-$(CONFIG_DHAV_DEMUXER) += dhav.o
> OBJS-$(CONFIG_DIRAC_DEMUXER) += diracdec.o rawdec.o
> diff --git a/libavformat/allformats.c b/libavformat/allformats.c
> index d275c1017b..af10def88b 100644
> --- a/libavformat/allformats.c
> +++ b/libavformat/allformats.c
> @@ -113,6 +113,7 @@ extern AVOutputFormat ff_data_muxer;
> extern AVInputFormat ff_daud_demuxer;
> extern AVOutputFormat ff_daud_muxer;
> extern AVInputFormat ff_dcstr_demuxer;
> +extern AVInputFormat ff_derf_demuxer;
> extern AVInputFormat ff_dfa_demuxer;
> extern AVInputFormat ff_dhav_demuxer;
> extern AVInputFormat ff_dirac_demuxer;
> 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;
Won't the reported duration be wrong if the file is trimmed? (Is this
how it is supposed to be?)
> + 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",
> +};
>
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