---
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/falcom_xa.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 100 insertions(+)
create mode 100644 libavformat/falcom_xa.c
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 6bdfbe6789..06b6b5da57 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -158,6 +158,7 @@ OBJS-$(CONFIG_EA_DEMUXER) += electronicarts.o
OBJS-$(CONFIG_EAC3_DEMUXER) += ac3dec.o rawdec.o
OBJS-$(CONFIG_EAC3_MUXER) += rawenc.o
OBJS-$(CONFIG_EPAF_DEMUXER) += epafdec.o pcm.o
+OBJS-$(CONFIG_FALCOM_XA_DEMUXER) += falcom_xa.o
OBJS-$(CONFIG_FFM_DEMUXER) += ffmdec.o
OBJS-$(CONFIG_FFM_MUXER) += ffmenc.o
OBJS-$(CONFIG_FFMETADATA_DEMUXER) += ffmetadec.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 09e62c3cfc..0c23ea9df0 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -117,6 +117,7 @@ static void register_all(void)
REGISTER_MUXDEMUX(EAC3, eac3);
REGISTER_DEMUXER (EPAF, epaf);
REGISTER_MUXER (F4V, f4v);
+ REGISTER_DEMUXER (FALCOM_XA, falcom_xa);
REGISTER_MUXDEMUX(FFM, ffm);
REGISTER_MUXDEMUX(FFMETADATA, ffmetadata);
REGISTER_MUXER (FIFO, fifo);
diff --git a/libavformat/falcom_xa.c b/libavformat/falcom_xa.c
new file mode 100644
index 0000000000..4c5f32a1b6
--- /dev/null
+++ b/libavformat/falcom_xa.c
@@ -0,0 +1,98 @@
+/*
+ * Falcom Xanadu demuxer
+ * Copyright (c) 2016 James Darnley
+ *
+ * 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 "avformat.h"
+
+typedef struct FalcomXADemuxContext {
+ const AVClass *class;
+ unsigned frame_size;
+} FalcomXADemuxContext;
+
+static av_cold
+int falcom_xa_read_header(AVFormatContext *s)
+{
+ int sample_rate, bit_depth, channels;
+ AVStream *st;
+ AVIOContext *pb = s->pb;
+
+ avio_seek(pb, 22, SEEK_SET);
+ channels = avio_rl16(pb);
+ if (channels != 2)
+ return AVERROR_INVALIDDATA;
+
+ sample_rate = avio_rl32(pb);
+ if (sample_rate != 44100)
+ return AVERROR_INVALIDDATA;
+
+ avio_seek(pb, 34, SEEK_SET);
+ bit_depth = avio_rl16(pb);
+ if (bit_depth != 16)
+ return AVERROR_INVALIDDATA;
+
+ avio_seek(pb, 44, SEEK_SET);
+
+ st = avformat_new_stream(s, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codecpar->codec_id = AV_CODEC_ID_ADPCM_MS;
+ st->codecpar->sample_rate = sample_rate;
+ st->codecpar->channels = channels;
+ st->codecpar->block_align = 2048;
+
+ return 0;
+}
+
+static
+int falcom_xa_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ FalcomXADemuxContext *ctx = s->priv_data;
+
+ if (ctx->frame_size == 0) {
+ unsigned tell = avio_tell(s->pb);
+ unsigned size = avio_rl32(s->pb);
+ av_log(ctx, AV_LOG_DEBUG, "read size %u (0x%x) at offset %u (0x%x)\n",
+ size, size, tell, tell);
+ if (size % 2048)
+ return AVERROR_INVALIDDATA;
+ ctx->frame_size = size;
+ avio_skip(s->pb, 4); // unknown bytes
+ }
+
+ ctx->frame_size -= 2048;
+ return av_get_packet(s->pb, pkt, 2048);
+}
+
+static const AVClass falcom_xa_demux_class = {
+ .class_name = "Falcom Xanadu demuxer",
+ .item_name = av_default_item_name,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_falcom_xa_demuxer = {
+ .name = "falcom_xa",
+ .long_name = NULL_IF_CONFIG_SMALL("Falcom Xanadu demuxer"),
+ .priv_data_size = sizeof(FalcomXADemuxContext),
+ .read_header = falcom_xa_read_header,
+ .read_packet = falcom_xa_read_packet,
+ .priv_class = &falcom_xa_demux_class,
+};
--
2.12.2
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