avformat: add XMD demuxer

Changelog

@@ -34,7 +34,7 @@ version <next>:
 - ssim360 video filter
 - ffmpeg CLI new options: -enc_stats_pre[_fmt], -enc_stats_post[_fmt]
 - hstack_vaapi, vstack_vaapi and xstack_vaapi filters
-- XMD ADPCM decoder
+- XMD ADPCM decoder and demuxer
 
 
 version 5.1:

libavformat/Makefile

@@ -621,6 +621,7 @@ OBJS-$(CONFIG_WVE_DEMUXER)               += wvedec.o pcm.o
 OBJS-$(CONFIG_WV_MUXER)                  += wvenc.o wv.o apetag.o img2.o
 OBJS-$(CONFIG_XA_DEMUXER)                += xa.o
 OBJS-$(CONFIG_XBIN_DEMUXER)              += bintext.o sauce.o
+OBJS-$(CONFIG_XMD_DEMUXER)               += xmd.o pcm.o
 OBJS-$(CONFIG_XMV_DEMUXER)               += xmv.o
 OBJS-$(CONFIG_XVAG_DEMUXER)              += xvag.o
 OBJS-$(CONFIG_XWMA_DEMUXER)              += xwma.o

libavformat/allformats.c

@@ -501,6 +501,7 @@ extern const AVInputFormat  ff_wv_demuxer;
 extern const AVOutputFormat ff_wv_muxer;
 extern const AVInputFormat  ff_xa_demuxer;
 extern const AVInputFormat  ff_xbin_demuxer;
+extern const AVInputFormat  ff_xmd_demuxer;
 extern const AVInputFormat  ff_xmv_demuxer;
 extern const AVInputFormat  ff_xvag_demuxer;
 extern const AVInputFormat  ff_xwma_demuxer;

libavformat/version.h

@@ -31,7 +31,7 @@
 
 #include "version_major.h"
 
-#define LIBAVFORMAT_VERSION_MINOR  36
+#define LIBAVFORMAT_VERSION_MINOR  37
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \

libavformat/xmd.c

@@ -0,0 +1,80 @@
+/*
+ * XMD demuxer
+ * Copyright (c) 2023 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/channel_layout.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "demux.h"
+#include "internal.h"
+#include "pcm.h"
+
+static int xmd_probe(const AVProbeData *p)
+{
+    if ((AV_RL32(p->buf) & 0xFFFFFF) != MKTAG('x','m','d',0))
+        return 0;
+    if (p->buf[3] == 0 || p->buf[3] > 2 ||
+        AV_RL16(p->buf+4) == 0 ||
+        AV_RL32(p->buf+6) == 0)
+        return 0;
+
+    return AVPROBE_SCORE_MAX / 3;
+}
+
+static int xmd_read_header(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    AVCodecParameters *par;
+    int channels;
+    AVStream *st;
+
+    avio_skip(pb, 3);
+
+    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_ADPCM_XMD;
+    channels         = avio_r8(pb);
+    if (channels == 0)
+        return AVERROR_INVALIDDATA;
+    av_channel_layout_default(&par->ch_layout, channels);
+    par->sample_rate = avio_rl16(pb);
+    if (par->sample_rate <= 0)
+        return AVERROR_INVALIDDATA;
+    par->block_align = 21 * channels;
+    st->duration = (avio_rl32(pb) / par->block_align) * 32LL;
+    avpriv_set_pts_info(st, 64, 1, par->sample_rate);
+    avio_skip(pb, 7);
+
+    return 0;
+}
+
+const AVInputFormat ff_xmd_demuxer = {
+    .name           = "xmd",
+    .long_name      = NULL_IF_CONFIG_SMALL("Konami XMD"),
+    .read_probe     = xmd_probe,
+    .read_header    = xmd_read_header,
+    .read_packet    = ff_pcm_read_packet,
+    .flags          = AVFMT_GENERIC_INDEX,
+    .extensions     = "xmd",
+};