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, 114 insertions, 0 deletions

diff --git a/libavformat/rsoenc.c b/libavformat/rsoenc.c
new file mode 100644
index 0000000000..5e670f4316
--- /dev/null
+++ b/libavformat/rsoenc.c
@@ -0,0 +1,114 @@
+/*
+ * RSO muxer
+ * 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 "avformat.h"
+#include "internal.h"
+#include "riff.h"
+#include "rso.h"
+
+static int rso_write_header(AVFormatContext *s)
+{
+    ByteIOContext  *pb  = s->pb;
+    AVCodecContext *enc = s->streams[0]->codec;
+
+    if (!enc->codec_tag)
+        return AVERROR_INVALIDDATA;
+
+    if (enc->channels != 1) {
+        av_log(s, AV_LOG_ERROR, "RSO only supports mono\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (url_is_streamed(s->pb)) {
+        av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* XXX: find legal sample rates (if any) */
+    if (enc->sample_rate >= 1u<<16) {
+        av_log(s, AV_LOG_ERROR, "Sample rate must be < 65536\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
+        av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    /* format header */
+    put_be16(pb, enc->codec_tag);   /* codec ID */
+    put_be16(pb, 0);                /* data size, will be written at EOF */
+    put_be16(pb, enc->sample_rate);
+    put_be16(pb, 0x0000);           /* play mode ? (0x0000 = don't loop) */
+
+    put_flush_packet(pb);
+
+    return 0;
+}
+
+static int rso_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    put_buffer(s->pb, pkt->data, pkt->size);
+    return 0;
+}
+
+static int rso_write_trailer(AVFormatContext *s)
+{
+    ByteIOContext *pb = s->pb;
+    int64_t file_size;
+    uint16_t coded_file_size;
+
+    file_size = url_ftell(pb);
+
+    if (file_size < 0)
+        return file_size;
+
+    if (file_size > 0xffff + RSO_HEADER_SIZE) {
+        av_log(s, AV_LOG_WARNING,
+               "Output file is too big (%"PRId64" bytes >= 64kB)\n", file_size);
+        coded_file_size = 0xffff;
+    } else {
+        coded_file_size = file_size - RSO_HEADER_SIZE;
+    }
+
+    /* update file size */
+    url_fseek(pb, 2, SEEK_SET);
+    put_be16(pb, coded_file_size);
+    url_fseek(pb, file_size, SEEK_SET);
+
+    put_flush_packet(pb);
+
+    return 0;
+}
+
+AVOutputFormat rso_muxer = {
+    .name           =   "rso",
+    .long_name      =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO format"),
+    .extensions     =   "rso",
+    .priv_data_size =   0,
+    .audio_codec    =   CODEC_ID_PCM_U8,
+    .video_codec    =   CODEC_ID_NONE,
+    .write_header   =   rso_write_header,
+    .write_packet   =   rso_write_packet,
+    .write_trailer  =   rso_write_trailer,
+    .codec_tag      =   (const AVCodecTag* const []){ff_codec_rso_tags, 0},
+};