Lego Mindstorms RSO muxer and demuxer.

Patch by Rafaël Carré, rafael d carre a gmail

Originally committed as revision 24355 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 102 insertions, 0 deletions

diff --git a/libavformat/rsodec.c b/libavformat/rsodec.c
new file mode 100644
index 0000000000..fbcf918c7e
--- /dev/null
+++ b/libavformat/rsodec.c
@@ -0,0 +1,102 @@
+/*
+ * RSO demuxer
+ * Copyright (c) 2001 Fabrice Bellard (original AU code)
+ * Copyright (c) 2010 Rafael Carre
+ *
+ * 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 "raw.h"
+#include "riff.h"
+#include "rso.h"
+
+static int rso_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    ByteIOContext *pb = s->pb;
+    int id, rate, bps;
+    unsigned int size;
+    enum CodecID codec;
+    AVStream *st;
+
+    id   = get_be16(pb);
+    size = get_be16(pb);
+    rate = get_be16(pb);
+    get_be16(pb);   /* play mode ? (0x0000 = don't loop) */
+
+    codec = ff_codec_get_id(ff_codec_rso_tags, id);
+
+    if (codec == CODEC_ID_ADPCM_IMA_WAV) {
+        av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    bps = av_get_bits_per_sample(codec);
+    if (!bps) {
+        av_log_ask_for_sample(s, "could not determine bits per sample\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* now we are ready: build format streams */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    st->duration            = (size * 8) / bps;
+    st->codec->codec_type   = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_tag    = id;
+    st->codec->codec_id     = codec;
+    st->codec->channels     = 1;
+    st->codec->sample_rate  = rate;
+
+    av_set_pts_info(st, 64, 1, rate);
+
+    return 0;
+}
+
+#define BLOCK_SIZE 1024 /* in samples */
+
+static int rso_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int bps = av_get_bits_per_sample(s->streams[0]->codec->codec_id);
+    int ret = av_get_packet(s->pb, pkt, BLOCK_SIZE * bps >> 3);
+
+    if (ret < 0)
+        return ret;
+
+    pkt->stream_index = 0;
+
+    /* note: we need to modify the packet size here to handle the last packet */
+    pkt->size = ret;
+
+    return 0;
+}
+
+AVInputFormat rso_demuxer = {
+    .name           =   "rso",
+    .long_name      =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO format"),
+    .extensions     =   "rso",
+    .priv_data_size =   0,
+    .read_probe     =   NULL, /* no magic value in this format */
+    .read_header    =   rso_read_header,
+    .read_packet    =   rso_read_packet,
+    .read_close     =   NULL,
+    .read_seek      =   pcm_read_seek,
+    .codec_tag      =   (const AVCodecTag* const []){ff_codec_rso_tags, 0},
+};