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/*
* 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
#include "mxf.h"
typedef struct {
int local_tag;
UID uid;
} MXFLocalTagPair;
typedef struct {
UID track_essence_element_key;
} MXFStreamContext;
typedef struct MXFContext {
int64_t header_byte_count;
int64_t header_byte_count_offset;
int64_t header_footer_partition_offset;
int essence_container_count;
} MXFContext;
static const uint8_t uuid_base[] = { 0xAD,0xAB,0x44,0x24,0x2f,0x25,0x4d,0xc7,0x92,0xff,0x29,0xbd };
static const uint8_t umid_base[] = { 0x06,0x0A,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x0F,0x00,0x13,0x00,0x00,0x00 };
/**
* complete key for operation pattern, partitions, and primer pack
*/
static const uint8_t op1a_ul[] = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x01,0x01,0x00 };
static const uint8_t header_partition_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }; // ClosedComplete
static const uint8_t footer_partition_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }; // ClosedComplete
static const uint8_t primer_pack_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x05,0x01,0x00 };
static void mxf_write_uuid(ByteIOContext *pb, enum CodecID type, int value)
{
put_buffer(pb, uuid_base, 12);
put_be16(pb, type);
put_be16(pb, value);
}
static void mxf_write_umid(ByteIOContext *pb, enum CodecID type, int value)
{
put_buffer(pb, umid_base, 16);
mxf_write_uuid(pb, type, value);
}
static int klv_encode_ber_length(ByteIOContext *pb, uint64_t len)
{
// Determine the best BER size
int size;
if (len < 128) {
//short form
put_byte(pb, len);
return 1;
}
size = (av_log2(len) >> 3) + 1;
// long form
put_byte(pb, 0x80 + size);
while(size) {
size --;
put_byte(pb, len >> 8 * size & 0xff);
}
return 0;
}
static const MXFCodecUL *mxf_get_essence_container_ul(enum CodecID type)
{
const MXFCodecUL *uls = ff_mxf_essence_container_uls;
while (uls->id != CODEC_ID_NONE) {
if (uls->id == type)
break;
uls++;
}
return uls;
}
static int mxf_write_primer_pack(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
int local_tag_number, i = 0;
local_tag_number = sizeof(mxf_local_tag_batch) / sizeof(MXFLocalTagPair);
put_buffer(pb, primer_pack_key, 16);
klv_encode_ber_length(pb, local_tag_number * 18 + 8);
put_be32(pb, local_tag_number); // local_tag num
put_be32(pb, 18); // item size, always 18 according to the specs
for (i = 0; i < local_tag_number; i++) {
put_be16(pb, mxf_local_tag_batch[i].local_tag);
put_buffer(pb, mxf_local_tag_batch[i].uid, 16);
}
return 0;
}
static void mxf_write_local_tag(ByteIOContext *pb, int value_size, int tag)
{
put_be16(pb, tag);
put_be16(pb, value_size);
}
static void mxf_write_metadata_key(ByteIOContext *pb, unsigned int value)
{
put_buffer(pb, header_metadata_key, 13);
put_be24(pb, value);
}
static void mxf_free(AVFormatContext *s)
{
AVStream *st;
int i;
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
av_freep(&st->priv_data);
}
}
static const MXFDataDefinitionUL *mxf_get_data_definition_ul(enum CodecType type)
{
const MXFDataDefinitionUL *uls = ff_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;
}
static int mxf_write_header_metadata_sets(AVFormatContext *s)
{
AVStream *st;
MXFStreamContext *sc = NULL;
int i;
if (mxf_write_preface(s) < 0)
return -1;
if (mxf_write_identification(s) < 0)
return -1;
if (mxf_write_content_storage(s) < 0)
return -1;
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
sc = av_mallocz(sizeof(MXFStreamContext));
if (!sc)
return AVERROR(ENOMEM);
st->priv_data = sc;
// set pts information
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
av_set_pts_info(st, 64, 1, st->codec->time_base.den);
} else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
}
}
if (mxf_build_structural_metadata(s, MaterialPackage) < 0)
return -1;
if (mxf_build_structural_metadata(s, SourcePackage) < 0)
return -1;
return 0;
}
static int mxf_update_header_partition(AVFormatContext *s, int64_t footer_partition_offset)
{
MXFContext *mxf = s->priv_data;
ByteIOContext *pb = s->pb;
url_fseek(pb, mxf->header_byte_count_offset, SEEK_SET);
put_be64(pb, mxf->header_byte_count);
put_flush_packet(pb);
url_fseek(pb, mxf->header_footer_partition_offset, SEEK_SET);
put_be64(pb, footer_partition_offset);
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,
};
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