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-rw-r--r--libavformat/avr.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/libavformat/avr.c b/libavformat/avr.c
new file mode 100644
index 0000000000..e03f1a46f7
--- /dev/null
+++ b/libavformat/avr.c
@@ -0,0 +1,100 @@
+/*
+ * AVR demuxer
+ * Copyright (c) 2012 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 avr_probe(AVProbeData *p)
+{
+ if (AV_RL32(p->buf) == MKTAG('2', 'B', 'I', 'T'))
+ return AVPROBE_SCORE_EXTENSION;
+ return 0;
+}
+
+static int avr_read_header(AVFormatContext *s)
+{
+ uint16_t chan, sign, bps;
+ AVStream *st;
+
+ st = avformat_new_stream(s, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+
+ avio_skip(s->pb, 4); // magic
+ avio_skip(s->pb, 8); // sample_name
+
+ chan = avio_rb16(s->pb);
+ if (!chan) {
+ st->codec->channels = 1;
+ } else if (chan == 0xFFFFu) {
+ st->codec->channels = 2;
+ } else {
+ avpriv_request_sample(s, "chan %d", chan);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ st->codec->bits_per_coded_sample = bps = avio_rb16(s->pb);
+
+ sign = avio_rb16(s->pb);
+
+ avio_skip(s->pb, 2); // loop
+ avio_skip(s->pb, 2); // midi
+ avio_skip(s->pb, 1); // replay speed
+
+ st->codec->sample_rate = avio_rb24(s->pb);
+ avio_skip(s->pb, 4 * 3);
+ avio_skip(s->pb, 2 * 3);
+ avio_skip(s->pb, 20);
+ avio_skip(s->pb, 64);
+
+ if (!sign && bps == 8) {
+ st->codec->codec_id = AV_CODEC_ID_PCM_U8;
+ } else if (!sign && bps == 16) {
+ st->codec->codec_id = AV_CODEC_ID_PCM_U16BE;
+ } else if (sign == 0xFFFFu && bps == 8) {
+ st->codec->codec_id = AV_CODEC_ID_PCM_S8;
+ } else if (sign == 0xFFFFu && bps == 16) {
+ st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
+ } else {
+ avpriv_request_sample(s, "bits per sample %d", bps);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ st->codec->block_align = bps * st->codec->channels / 8;
+
+ avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+ return 0;
+}
+
+AVInputFormat ff_avr_demuxer = {
+ .name = "avr",
+ .long_name = NULL_IF_CONFIG_SMALL("AVR (Audio Visual Research)"),
+ .read_probe = avr_probe,
+ .read_header = avr_read_header,
+ .read_packet = ff_pcm_read_packet,
+ .read_seek = ff_pcm_read_seek,
+ .extensions = "avr",
+ .flags = AVFMT_GENERIC_INDEX,
+};