import ok'd hunks for mxf muxer

Originally committed as revision 14765 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mxfenc.c

+/*
+ * MXF muxer
+ * Copyright (c) 2008 GUCAS, Zhentan Feng <spyfeng at gmail dot com>
+ *
+ * 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
+ */
+
+/*
+ * References
+ * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
+ * SMPTE 377M MXF File Format Specifications
+ * SMPTE 379M MXF Generic Container
+ * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
+ * SMPTE RP210: SMPTE Metadata Dictionary
+ * SMPTE RP224: Registry of SMPTE Universal Labels
+ */
+
+//#define DEBUG
+
+static const MXFCodecUL *mxf_get_essence_container_ul(enum CodecID type)
+{
+    const MXFCodecUL *uls = mxf_essence_container_uls;
+    while (uls->id != CODEC_ID_NONE) {
+        if (uls->id == type)
+            break;
+        uls++;
+    }
+    return uls;
+}
+
+static void mxf_free(AVFormatContext *s)
+{
+    MXFContext *mxf = s->priv_data;
+    AVStream *st;
+    int i;
+
+    av_freep(&mxf->reference.identification);
+    av_freep(mxf->reference.package);
+    av_freep(&mxf->reference.package);
+    av_freep(&mxf->reference.content_storage);
+    for (i = 0; i < s->nb_streams; i++) {
+        st = s->streams[i];
+        av_freep(&st->priv_data);
+    }
+    av_freep(mxf->reference.sub_desc);
+    av_freep(&mxf->reference.sub_desc);
+    av_freep(&mxf->reference.mul_desc);
+    av_freep(&mxf->essence_container_uls);
+}
+
+static const MXFDataDefinitionUL *mxf_get_data_definition_ul(enum CodecType type)
+{
+    const MXFDataDefinitionUL *uls = mxf_data_definition_uls;
+    while (uls->type != CODEC_TYPE_DATA) {
+        if (type == uls->type)
+            break;
+        uls ++;
+    }
+    return uls;
+}
+
+static int mux_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    ByteIOContext *pb = s->pb;
+    AVStream *st = s->streams[pkt->stream_index];
+    MXFStreamContext *sc = st->priv_data;
+
+    put_buffer(pb, sc->track_essence_element_key, 16); // write key
+    klv_encode_ber_length(pb, pkt->size); // write length
+    put_buffer(pb, pkt->data, pkt->size); // write value
+
+    put_flush_packet(pb);
+    return 0;
+}
+
+AVOutputFormat mxf_muxer = {
+    "mxf",
+    NULL_IF_CONFIG_SMALL("Material eXchange Format"),
+    NULL,
+    "mxf",
+    sizeof(MXFContext),
+    CODEC_ID_PCM_S16LE,
+    CODEC_ID_MPEG2VIDEO,
+    mux_write_header,
+    mux_write_packet,
+    mux_write_footer,
+};