Paul B Mahol:
> Signed-off-by: Paul B Mahol <one...@gmail.com>
> ---
> libavformat/Makefile | 1 +
> libavformat/allformats.c | 1 +
> libavformat/binka.c | 103 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 105 insertions(+)
> create mode 100644 libavformat/binka.c
>
> diff --git a/libavformat/Makefile b/libavformat/Makefile
> index 85f432c8d9..b977fa0b1e 100644
> --- a/libavformat/Makefile
> +++ b/libavformat/Makefile
> @@ -131,6 +131,7 @@ OBJS-$(CONFIG_AVS3_DEMUXER) += avs3dec.o
> rawdec.o
> OBJS-$(CONFIG_BETHSOFTVID_DEMUXER) += bethsoftvid.o
> OBJS-$(CONFIG_BFI_DEMUXER) += bfi.o
> OBJS-$(CONFIG_BINK_DEMUXER) += bink.o
> +OBJS-$(CONFIG_BINKA_DEMUXER) += binka.o
> OBJS-$(CONFIG_BINTEXT_DEMUXER) += bintext.o sauce.o
> OBJS-$(CONFIG_BIT_DEMUXER) += bit.o
> OBJS-$(CONFIG_BIT_MUXER) += bit.o
> diff --git a/libavformat/allformats.c b/libavformat/allformats.c
> index 6990af55f4..9628c726a7 100644
> --- a/libavformat/allformats.c
> +++ b/libavformat/allformats.c
> @@ -94,6 +94,7 @@ extern AVInputFormat ff_bethsoftvid_demuxer;
> extern AVInputFormat ff_bfi_demuxer;
> extern AVInputFormat ff_bintext_demuxer;
> extern AVInputFormat ff_bink_demuxer;
> +extern AVInputFormat ff_binka_demuxer;
> extern AVInputFormat ff_bit_demuxer;
> extern AVOutputFormat ff_bit_muxer;
> extern AVInputFormat ff_bmv_demuxer;
> diff --git a/libavformat/binka.c b/libavformat/binka.c
> new file mode 100644
> index 0000000000..b8e09b9c10
> --- /dev/null
> +++ b/libavformat/binka.c
> @@ -0,0 +1,103 @@
> +/*
> + * Copyright (c) 2021 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"
> +
> +static int binka_probe(const AVProbeData *p)
> +{
> + if (AV_RB32(p->buf) == MKBETAG('1', 'F', 'C', 'B') &&
> + (p->buf[4] == 1 || p->buf[4] == 2))
> + return AVPROBE_SCORE_MAX;
> + return 0;
> +}
> +
> +static int binka_read_header(AVFormatContext *s)
> +{
> + AVIOContext *pb = s->pb;
> + AVStream *st;
> + int entries;
> + int64_t offset;
> +
> + st = avformat_new_stream(s, NULL);
> + if (!st)
> + return AVERROR(ENOMEM);
> +
> + avio_skip(pb, 5);
> +
> + st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
> + st->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
> + st->codecpar->channels = avio_r8(pb);
> + st->codecpar->sample_rate = avio_rl16(pb);
> + st->duration = avio_rl32(pb);
> +
> + avio_skip(pb, 8);
> + entries = avio_rl16(pb);
> + avio_skip(pb, 2);
If you are skipping this, you can combine it with the avio_skip below.
> +
> + offset = entries * 2;
> + avio_skip(pb, offset);
> +
> + avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
> +
> + return 0;
> +}
> +
> +static int binka_read_packet(AVFormatContext *s, AVPacket *pkt)
> +{
> + AVIOContext *pb = s->pb;
> + AVStream *st = s->streams[0];
> + int64_t pos;
> + int pkt_size;
> + int ret;
> +
> + if (avio_feof(pb))
> + return AVERROR_EOF;
> +
> + pos = avio_tell(pb);
> + avio_skip(pb, 2);
> + pkt_size = avio_rl16(pb) + 4;
> + if (pkt_size <= 4)
> + return AVERROR(EIO);
> + ret = av_new_packet(pkt, pkt_size);
> + if (ret < 0)
> + return ret;
> +
> + avio_read(pb, pkt->data + 4, pkt_size - 4);
> + AV_WL32(pkt->data, pkt_size);
> +
> + pkt->pos = pos;
> + pkt->stream_index = 0;
> + pkt->duration = av_get_audio_frame_duration2(st->codecpar, 0);
> + pkt->flags |= AV_PKT_FLAG_KEY;
AV_CODEC_ID_BINKAUDIO_DCT is an intra-only codec, so this flag will be
set generically (IIRC).
> +
> + return 0;
> +}
> +
> +AVInputFormat ff_binka_demuxer = {
> + .name = "binka",
> + .long_name = NULL_IF_CONFIG_SMALL("Bink Audio"),
> + .read_probe = binka_probe,
> + .read_header = binka_read_header,
> + .read_packet = binka_read_packet,
> + .flags = AVFMT_GENERIC_INDEX,
> + .extensions = "binka",
> +};
>
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