git.sesse.net Git - ffmpeg/blob - libavformat/mxfenc.c

   1 /*
   2  * MXF muxer
   3  * Copyright (c) 2008 GUCAS, Zhentan Feng <spyfeng at gmail dot com>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /*
  23  * References
  24  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
  25  * SMPTE 377M MXF File Format Specifications
  26  * SMPTE 379M MXF Generic Container
  27  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
  28  * SMPTE RP210: SMPTE Metadata Dictionary
  29  * SMPTE RP224: Registry of SMPTE Universal Labels
  30  */
  31
  32 //#define DEBUG
  33
  34 #include "libavutil/fifo.h"
  35 #include "mxf.h"
  36
  37 static const int NTSC_samples_per_frame[] = { 1602, 1601, 1602, 1601, 1602, 0 };
  38 static const int PAL_samples_per_frame[]  = { 1920, 0 };
  39
  40 typedef struct {
  41     AVFifoBuffer fifo;
  42     unsigned fifo_size; ///< current fifo size allocated
  43     uint64_t dts; ///< current dts
  44     int sample_size; ///< size of one sample all channels included
  45     const int *samples_per_frame; ///< must be 0 terminated
  46     const int *samples; ///< current samples per frame, pointer to samples_per_frame
  47 } AudioInterleaveContext;
  48
  49 typedef struct {
  50     int local_tag;
  51     UID uid;
  52 } MXFLocalTagPair;
  53
  54 typedef struct {
  55     AudioInterleaveContext aic;
  56     UID track_essence_element_key;
  57     int index; //<<< index in mxf_essence_container_uls table
  58     const UID *codec_ul;
  59     int64_t duration;
  60     int order; ///< interleaving order if dts are equal
  61     int interlaced; ///< wether picture is interlaced
  62 } MXFStreamContext;
  63
  64 typedef struct {
  65     UID container_ul;
  66     UID element_ul;
  67     UID codec_ul;
  68     enum CodecID id;
  69     void (*write_desc)();
  70 } MXFContainerEssenceEntry;
  71
  72 static void mxf_write_wav_desc(AVFormatContext *s, AVStream *st);
  73 static void mxf_write_mpegvideo_desc(AVFormatContext *s, AVStream *st);
  74
  75 static const MXFContainerEssenceEntry mxf_essence_container_uls[] = {
  76     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 },
  77       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },
  78       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x00,0x00,0x00 },
  79       CODEC_ID_MPEG2VIDEO, mxf_write_mpegvideo_desc },
  80     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },
  81       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x01,0x00 },
  82       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
  83       CODEC_ID_PCM_S16LE, mxf_write_wav_desc },
  84     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
  85       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
  86       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
  87       CODEC_ID_NONE, NULL },
  88 };
  89
  90 typedef struct MXFContext {
  91     int64_t footer_partition_offset;
  92     int essence_container_count;
  93     uint8_t essence_containers_indices[FF_ARRAY_ELEMS(mxf_essence_container_uls)];
  94     AVRational time_base;
  95     int header_written;
  96 } MXFContext;
  97
  98 static const uint8_t uuid_base[]            = { 0xAD,0xAB,0x44,0x24,0x2f,0x25,0x4d,0xc7,0x92,0xff,0x29,0xbd };
  99 static const uint8_t umid_base[]            = { 0x06,0x0A,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x01,0x0D,0x00,0x13,0x00,0x00,0x00 };
 100
 101 /**
 102  * complete key for operation pattern, partitions, and primer pack
 103  */
 104 static const uint8_t op1a_ul[]              = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x01,0x01,0x00 };
 105 static const uint8_t footer_partition_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }; // ClosedComplete
 106 static const uint8_t primer_pack_key[]      = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x05,0x01,0x00 };
 107
 108
 109 static const uint8_t header_open_partition_key[]   = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }; // OpenIncomplete
 110 static const uint8_t header_closed_partition_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }; // ClosedComplete
 111
 112 /**
 113  * partial key for header metadata
 114  */
 115 static const uint8_t header_metadata_key[]  = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0D,0x01,0x01,0x01,0x01 };
 116
 117 static const uint8_t multiple_desc_ul[] = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x0D,0x01,0x03,0x01,0x02,0x7F,0x01,0x00 };
 118
 119 /**
 120  * SMPTE RP210 http://www.smpte-ra.org/mdd/index.html
 121  */
 122 static const MXFLocalTagPair mxf_local_tag_batch[] = {
 123     // preface set
 124     { 0x3C0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x02,0x00,0x00,0x00,0x00}}, /* Instance UID */
 125     { 0x3B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x04,0x00,0x00}}, /* Last Modified Date */
 126     { 0x3B05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x03,0x01,0x02,0x01,0x05,0x00,0x00,0x00}}, /* Version */
 127     { 0x3B06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x04,0x00,0x00}}, /* Identifications reference */
 128     { 0x3B03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x01,0x00,0x00}}, /* Content Storage reference */
 129     { 0x3B09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x03,0x00,0x00,0x00,0x00}}, /* Operational Pattern UL */
 130     { 0x3B0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x01,0x00,0x00}}, /* Essence Containers UL batch */
 131     { 0x3B0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x02,0x00,0x00}}, /* DM Schemes UL batch */
 132     // Identification
 133     { 0x3C09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x01,0x00,0x00,0x00}}, /* This Generation UID */
 134     { 0x3C01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x02,0x01,0x00,0x00}}, /* Company Name */
 135     { 0x3C02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x03,0x01,0x00,0x00}}, /* Product Name */
 136     { 0x3C04, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x05,0x01,0x00,0x00}}, /* Version String */
 137     { 0x3C05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x07,0x00,0x00,0x00}}, /* Product ID */
 138     { 0x3C06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x03,0x00,0x00}}, /* Modification Date */
 139     // Content Storage
 140     { 0x1901, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x01,0x00,0x00}}, /* Package strong reference batch */
 141     { 0x1902, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x02,0x00,0x00}}, /* Package strong reference batch */
 142     // Essence Container Data
 143     { 0x2701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x06,0x01,0x00,0x00,0x00}}, /* Linked Package UID */
 144     { 0x3F07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x04,0x00,0x00,0x00,0x00}}, /* BodySID */
 145     // Package
 146     { 0x4401, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x10,0x00,0x00,0x00,0x00}}, /* Package UID */
 147     { 0x4405, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x01,0x03,0x00,0x00}}, /* Package Creation Date */
 148     { 0x4404, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x05,0x00,0x00}}, /* Package Modified Date */
 149     { 0x4403, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x05,0x00,0x00}}, /* Tracks Strong reference array */
 150     { 0x4701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x03,0x00,0x00}}, /* Descriptor */
 151     // Track
 152     { 0x4801, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x07,0x01,0x01,0x00,0x00,0x00,0x00}}, /* Track ID */
 153     { 0x4804, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x04,0x01,0x03,0x00,0x00,0x00,0x00}}, /* Track Number */
 154     { 0x4B01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x30,0x04,0x05,0x00,0x00,0x00,0x00}}, /* Edit Rate */
 155     { 0x4B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x03,0x00,0x00}}, /* Origin */
 156     { 0x4803, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x04,0x00,0x00}}, /* Sequence reference */
 157     // Sequence
 158     { 0x0201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x07,0x01,0x00,0x00,0x00,0x00,0x00}}, /* Data Definition UL */
 159     { 0x0202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x02,0x01,0x01,0x03,0x00,0x00}}, /* Duration */
 160     { 0x1001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x09,0x00,0x00}}, /* Structural Components reference array */
 161     // Source Clip
 162     { 0x1201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x01,0x03,0x01,0x04,0x00,0x00}}, /* Start position */
 163     { 0x1101, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x01,0x00,0x00,0x00}}, /* SourcePackageID */
 164     { 0x1102, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x02,0x00,0x00,0x00}}, /* SourceTrackID */
 165     // File Descriptor
 166     { 0x3F01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x04,0x06,0x0B,0x00,0x00}}, /* Sub Descriptors reference array */
 167     { 0x3006, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x06,0x01,0x01,0x03,0x05,0x00,0x00,0x00}}, /* Linked Track ID */
 168     { 0x3001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x00,0x00,0x00,0x00}}, /* SampleRate */
 169     { 0x3004, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x01,0x02,0x00,0x00}}, /* Essence Container */
 170     // Generic Picture Essence Descriptor
 171     { 0x3203, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x02,0x00,0x00,0x00}}, /* Stored Width */
 172     { 0x3202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x01,0x00,0x00,0x00}}, /* Stored Height */
 173     { 0x320E, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x01,0x01,0x01,0x00,0x00,0x00}}, /* Aspect Ratio */
 174     { 0x3201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x06,0x01,0x00,0x00,0x00,0x00}}, /* Picture Essence Coding */
 175     // Generic Sound Essence Descriptor
 176     { 0x3D03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x01,0x01,0x00,0x00}}, /* Audio sampling rate */
 177     { 0x3D07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x01,0x01,0x04,0x00,0x00,0x00}}, /* ChannelCount */
 178     { 0x3D01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x03,0x04,0x00,0x00,0x00}}, /* Quantization bits */
 179     { 0x3D06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x02,0x04,0x02,0x00,0x00,0x00,0x00}}, /* Sound Essence Compression */
 180 };
 181
 182 static void mxf_write_uuid(ByteIOContext *pb, enum MXFMetadataSetType type, int value)
 183 {
 184     put_buffer(pb, uuid_base, 12);
 185     put_be16(pb, type);
 186     put_be16(pb, value);
 187 }
 188
 189 static void mxf_write_umid(ByteIOContext *pb, enum MXFMetadataSetType type, int value)
 190 {
 191     put_buffer(pb, umid_base, 16);
 192     mxf_write_uuid(pb, type, value);
 193 }
 194
 195 static void mxf_write_refs_count(ByteIOContext *pb, int ref_count)
 196 {
 197     put_be32(pb, ref_count);
 198     put_be32(pb, 16);
 199 }
 200
 201 static int klv_encode_ber_length(ByteIOContext *pb, uint64_t len)
 202 {
 203     // Determine the best BER size
 204     int size;
 205     if (len < 128) {
 206         //short form
 207         put_byte(pb, len);
 208         return 1;
 209     }
 210
 211     size = (av_log2(len) >> 3) + 1;
 212
 213     // long form
 214     put_byte(pb, 0x80 + size);
 215     while(size) {
 216         size --;
 217         put_byte(pb, len >> 8 * size & 0xff);
 218     }
 219     return 0;
 220 }
 221
 222 /*
 223  * Get essence container ul index
 224  */
 225 static int mxf_get_essence_container_ul_index(enum CodecID id)
 226 {
 227     int i;
 228     for (i = 0; i < FF_ARRAY_ELEMS(mxf_essence_container_uls); i++)
 229         if (mxf_essence_container_uls[i].id == id)
 230             return i;
 231     return -1;
 232 }
 233
 234 static void mxf_write_primer_pack(AVFormatContext *s)
 235 {
 236     ByteIOContext *pb = s->pb;
 237     int local_tag_number, i = 0;
 238
 239     local_tag_number = FF_ARRAY_ELEMS(mxf_local_tag_batch);
 240
 241     put_buffer(pb, primer_pack_key, 16);
 242     klv_encode_ber_length(pb, local_tag_number * 18 + 8);
 243
 244     put_be32(pb, local_tag_number); // local_tag num
 245     put_be32(pb, 18); // item size, always 18 according to the specs
 246
 247     for (i = 0; i < local_tag_number; i++) {
 248         put_be16(pb, mxf_local_tag_batch[i].local_tag);
 249         put_buffer(pb, mxf_local_tag_batch[i].uid, 16);
 250     }
 251 }
 252
 253 static void mxf_write_local_tag(ByteIOContext *pb, int size, int tag)
 254 {
 255     put_be16(pb, tag);
 256     put_be16(pb, size);
 257 }
 258
 259 static void mxf_write_metadata_key(ByteIOContext *pb, unsigned int value)
 260 {
 261     put_buffer(pb, header_metadata_key, 13);
 262     put_be24(pb, value);
 263 }
 264
 265 static void mxf_free(AVFormatContext *s)
 266 {
 267     int i;
 268
 269     for (i = 0; i < s->nb_streams; i++) {
 270         AVStream *st = s->streams[i];
 271         av_freep(&st->priv_data);
 272     }
 273 }
 274
 275 static const MXFDataDefinitionUL *mxf_get_data_definition_ul(enum CodecType type)
 276 {
 277     const MXFDataDefinitionUL *uls = ff_mxf_data_definition_uls;
 278     while (uls->type != CODEC_TYPE_DATA) {
 279         if (type == uls->type)
 280             break;
 281         uls++;
 282     }
 283     return uls;
 284 }
 285
 286 static void mxf_write_essence_container_refs(AVFormatContext *s)
 287 {
 288     MXFContext *c = s->priv_data;
 289     ByteIOContext *pb = s->pb;
 290     int i;
 291
 292     mxf_write_refs_count(pb, c->essence_container_count);
 293     av_log(s,AV_LOG_DEBUG, "essence container count:%d\n", c->essence_container_count);
 294     for (i = 0; i < c->essence_container_count; i++) {
 295         put_buffer(pb, mxf_essence_container_uls[c->essence_containers_indices[i]].container_ul, 16);
 296         PRINT_KEY(s, "essence container ul:\n", mxf_essence_container_uls[c->essence_containers_indices[i]].container_ul);
 297     }
 298 }
 299
 300 static void mxf_write_preface(AVFormatContext *s)
 301 {
 302     MXFContext *mxf = s->priv_data;
 303     ByteIOContext *pb = s->pb;
 304
 305     mxf_write_metadata_key(pb, 0x012f00);
 306     PRINT_KEY(s, "preface key", pb->buf_ptr - 16);
 307     klv_encode_ber_length(pb, 130 + 16 * mxf->essence_container_count);
 308
 309     // write preface set uid
 310     mxf_write_local_tag(pb, 16, 0x3C0A);
 311     mxf_write_uuid(pb, Preface, 0);
 312     PRINT_KEY(s, "preface uid", pb->buf_ptr - 16);
 313
 314     // write create date as unknown
 315     mxf_write_local_tag(pb, 8, 0x3B02);
 316     put_be64(pb, 0);
 317
 318     // write version
 319     mxf_write_local_tag(pb, 2, 0x3B05);
 320     put_be16(pb, 1);
 321
 322     // write identification_refs
 323     mxf_write_local_tag(pb, 16 + 8, 0x3B06);
 324     mxf_write_refs_count(pb, 1);
 325     mxf_write_uuid(pb, Identification, 0);
 326
 327     // write content_storage_refs
 328     mxf_write_local_tag(pb, 16, 0x3B03);
 329     mxf_write_uuid(pb, ContentStorage, 0);
 330
 331     mxf_write_local_tag(pb, 16, 0x3B09);
 332     put_buffer(pb, op1a_ul, 16);
 333
 334     // write essence_container_refs
 335     mxf_write_local_tag(pb, 8 + 16 * mxf->essence_container_count, 0x3B0A);
 336     mxf_write_essence_container_refs(s);
 337
 338     // write dm_scheme_refs
 339     mxf_write_local_tag(pb, 8, 0x3B0B);
 340     put_be64(pb, 0);
 341 }
 342
 343 /*
 344  * Write a local tag containing an ascii string as utf-16
 345  */
 346 static void mxf_write_local_tag_utf16(ByteIOContext *pb, int tag, const char *value)
 347 {
 348     int i, size = strlen(value);
 349     mxf_write_local_tag(pb, size*2, tag);
 350     for (i = 0; i < size; i++)
 351         put_be16(pb, value[i]);
 352 }
 353
 354 static void mxf_write_identification(AVFormatContext *s)
 355 {
 356     ByteIOContext *pb = s->pb;
 357     const char *company = "FFmpeg";
 358     const char *product = "OP1a Muxer";
 359     const char *version;
 360     int length;
 361
 362     mxf_write_metadata_key(pb, 0x013000);
 363     PRINT_KEY(s, "identification key", pb->buf_ptr - 16);
 364
 365     version = s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT ?
 366         "0.0.0" : AV_STRINGIFY(LIBAVFORMAT_VERSION);
 367     length = 84 + (strlen(company)+strlen(product)+strlen(version))*2; // utf-16
 368     klv_encode_ber_length(pb, length);
 369
 370     // write uid
 371     mxf_write_local_tag(pb, 16, 0x3C0A);
 372     mxf_write_uuid(pb, Identification, 0);
 373     PRINT_KEY(s, "identification uid", pb->buf_ptr - 16);
 374
 375     // write generation uid
 376     mxf_write_local_tag(pb, 16, 0x3C09);
 377     mxf_write_uuid(pb, Identification, 1);
 378
 379     mxf_write_local_tag_utf16(pb, 0x3C01, company); // Company Name
 380     mxf_write_local_tag_utf16(pb, 0x3C02, product); // Product Name
 381     mxf_write_local_tag_utf16(pb, 0x3C04, version); // Version String
 382
 383     // write product uid
 384     mxf_write_local_tag(pb, 16, 0x3C05);
 385     mxf_write_uuid(pb, Identification, 2);
 386
 387     // write modified date
 388     mxf_write_local_tag(pb, 8, 0x3C06);
 389     put_be64(pb, 0);
 390 }
 391
 392 static void mxf_write_content_storage(AVFormatContext *s)
 393 {
 394     ByteIOContext *pb = s->pb;
 395
 396     mxf_write_metadata_key(pb, 0x011800);
 397     PRINT_KEY(s, "content storage key", pb->buf_ptr - 16);
 398     klv_encode_ber_length(pb, 92);
 399
 400     // write uid
 401     mxf_write_local_tag(pb, 16, 0x3C0A);
 402     mxf_write_uuid(pb, ContentStorage, 0);
 403     PRINT_KEY(s, "content storage uid", pb->buf_ptr - 16);
 404
 405     // write package reference
 406     mxf_write_local_tag(pb, 16 * 2 + 8, 0x1901);
 407     mxf_write_refs_count(pb, 2);
 408     mxf_write_uuid(pb, MaterialPackage, 0);
 409     mxf_write_uuid(pb, SourcePackage, 0);
 410
 411     // write essence container data
 412     mxf_write_local_tag(pb, 8 + 16, 0x1902);
 413     mxf_write_refs_count(pb, 1);
 414     mxf_write_uuid(pb, EssenceContainerData, 0);
 415 }
 416
 417 static void mxf_write_track(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
 418 {
 419     ByteIOContext *pb = s->pb;
 420     MXFStreamContext *sc = st->priv_data;
 421
 422     mxf_write_metadata_key(pb, 0x013b00);
 423     PRINT_KEY(s, "track key", pb->buf_ptr - 16);
 424     klv_encode_ber_length(pb, 80);
 425
 426     // write track uid
 427     mxf_write_local_tag(pb, 16, 0x3C0A);
 428     mxf_write_uuid(pb, type == MaterialPackage ? Track : Track + TypeBottom, st->index);
 429     PRINT_KEY(s, "track uid", pb->buf_ptr - 16);
 430
 431     // write track id
 432     mxf_write_local_tag(pb, 4, 0x4801);
 433     put_be32(pb, st->index);
 434
 435     // write track number
 436     mxf_write_local_tag(pb, 4, 0x4804);
 437     if (type == MaterialPackage)
 438         put_be32(pb, 0); // track number of material package is 0
 439     else
 440         put_buffer(pb, sc->track_essence_element_key + 12, 4);
 441
 442     mxf_write_local_tag(pb, 8, 0x4B01);
 443     put_be32(pb, st->time_base.den);
 444     put_be32(pb, st->time_base.num);
 445
 446     // write origin
 447     mxf_write_local_tag(pb, 8, 0x4B02);
 448     put_be64(pb, 0);
 449
 450     // write sequence refs
 451     mxf_write_local_tag(pb, 16, 0x4803);
 452     mxf_write_uuid(pb, type == MaterialPackage ? Sequence: Sequence + TypeBottom, st->index);
 453 }
 454
 455 static void mxf_write_common_fields(ByteIOContext *pb, AVStream *st)
 456 {
 457     const MXFDataDefinitionUL *data_def_ul = mxf_get_data_definition_ul(st->codec->codec_type);
 458     MXFStreamContext *sc = st->priv_data;
 459
 460     // find data define uls
 461     mxf_write_local_tag(pb, 16, 0x0201);
 462     put_buffer(pb, data_def_ul->uid, 16);
 463
 464     // write duration
 465     mxf_write_local_tag(pb, 8, 0x0202);
 466     put_be64(pb, sc->duration);
 467 }
 468
 469 static void mxf_write_sequence(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
 470 {
 471     ByteIOContext *pb = s->pb;
 472
 473     mxf_write_metadata_key(pb, 0x010f00);
 474     PRINT_KEY(s, "sequence key", pb->buf_ptr - 16);
 475     klv_encode_ber_length(pb, 80);
 476
 477     mxf_write_local_tag(pb, 16, 0x3C0A);
 478     mxf_write_uuid(pb, type == MaterialPackage ? Sequence: Sequence + TypeBottom, st->index);
 479
 480     PRINT_KEY(s, "sequence uid", pb->buf_ptr - 16);
 481     mxf_write_common_fields(pb, st);
 482
 483     // write structural component
 484     mxf_write_local_tag(pb, 16 + 8, 0x1001);
 485     mxf_write_refs_count(pb, 1);
 486     mxf_write_uuid(pb, type == MaterialPackage ? SourceClip: SourceClip + TypeBottom, st->index);
 487 }
 488
 489 static void mxf_write_structural_component(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
 490 {
 491     ByteIOContext *pb = s->pb;
 492     int i;
 493
 494     mxf_write_metadata_key(pb, 0x011100);
 495     PRINT_KEY(s, "sturctural component key", pb->buf_ptr - 16);
 496     klv_encode_ber_length(pb, 108);
 497
 498     // write uid
 499     mxf_write_local_tag(pb, 16, 0x3C0A);
 500     mxf_write_uuid(pb, type == MaterialPackage ? SourceClip: SourceClip + TypeBottom, st->index);
 501
 502     PRINT_KEY(s, "structural component uid", pb->buf_ptr - 16);
 503     mxf_write_common_fields(pb, st);
 504
 505     // write start_position
 506     mxf_write_local_tag(pb, 8, 0x1201);
 507     put_be64(pb, 0);
 508
 509     // write source package uid, end of the reference
 510     mxf_write_local_tag(pb, 32, 0x1101);
 511     if (type == SourcePackage) {
 512         for (i = 0; i < 4; i++)
 513             put_be64(pb, 0);
 514     } else
 515         mxf_write_umid(pb, SourcePackage, 0);
 516
 517     // write source track id
 518     mxf_write_local_tag(pb, 4, 0x1102);
 519     if (type == SourcePackage)
 520         put_be32(pb, 0);
 521     else
 522         put_be32(pb, st->index);
 523 }
 524
 525 static void mxf_write_multi_descriptor(AVFormatContext *s)
 526 {
 527     ByteIOContext *pb = s->pb;
 528     int i;
 529
 530     mxf_write_metadata_key(pb, 0x014400);
 531     PRINT_KEY(s, "multiple descriptor key", pb->buf_ptr - 16);
 532     klv_encode_ber_length(pb, 64 + 16 * s->nb_streams);
 533
 534     mxf_write_local_tag(pb, 16, 0x3C0A);
 535     mxf_write_uuid(pb, MultipleDescriptor, 0);
 536     PRINT_KEY(s, "multi_desc uid", pb->buf_ptr - 16);
 537
 538     // write sample rate
 539     mxf_write_local_tag(pb, 8, 0x3001);
 540     put_be32(pb, s->streams[0]->time_base.den);
 541     put_be32(pb, s->streams[0]->time_base.num);
 542
 543     // write essence container ul
 544     mxf_write_local_tag(pb, 16, 0x3004);
 545     put_buffer(pb, multiple_desc_ul, 16);
 546
 547     // write sub descriptor refs
 548     mxf_write_local_tag(pb, s->nb_streams * 16 + 8, 0x3F01);
 549     mxf_write_refs_count(pb, s->nb_streams);
 550     for (i = 0; i < s->nb_streams; i++)
 551         mxf_write_uuid(pb, SubDescriptor, i);
 552 }
 553
 554 static void mxf_write_generic_desc(ByteIOContext *pb, AVStream *st, const UID key, unsigned size)
 555 {
 556     MXFStreamContext *sc = st->priv_data;
 557
 558     put_buffer(pb, key, 16);
 559     klv_encode_ber_length(pb, size);
 560
 561     mxf_write_local_tag(pb, 16, 0x3C0A);
 562     mxf_write_uuid(pb, SubDescriptor, st->index);
 563
 564     mxf_write_local_tag(pb, 4, 0x3006);
 565     put_be32(pb, st->index);
 566
 567     mxf_write_local_tag(pb, 8, 0x3001);
 568     put_be32(pb, st->time_base.den);
 569     put_be32(pb, st->time_base.num);
 570
 571     mxf_write_local_tag(pb, 16, 0x3004);
 572     put_buffer(pb, mxf_essence_container_uls[sc->index].container_ul, 16);
 573
 574     mxf_write_local_tag(pb, 16, 0x3201);
 575     put_buffer(pb, *sc->codec_ul, 16);
 576 }
 577
 578 static const UID mxf_mpegvideo_descriptor_key = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 };
 579 static const UID mxf_wav_descriptor_key       = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 };
 580
 581 static void mxf_write_mpegvideo_desc(AVFormatContext *s, AVStream *st)
 582 {
 583     ByteIOContext *pb = s->pb;
 584     int stored_height = (st->codec->height+15)/16*16;
 585     AVRational dar;
 586
 587     mxf_write_generic_desc(pb, st, mxf_mpegvideo_descriptor_key, 108);
 588
 589     mxf_write_local_tag(pb, 4, 0x3203);
 590     put_be32(pb, st->codec->width);
 591
 592     mxf_write_local_tag(pb, 4, 0x3202);
 593     put_be32(pb, stored_height);
 594
 595     av_reduce(&dar.num, &dar.den,
 596               st->codec->width*st->codec->sample_aspect_ratio.num,
 597               st->codec->height*st->codec->sample_aspect_ratio.den,
 598               1024*1024);
 599
 600     mxf_write_local_tag(pb, 8, 0x320E);
 601     put_be32(pb, dar.num);
 602     put_be32(pb, dar.den);
 603 }
 604
 605 static void mxf_write_wav_desc(AVFormatContext *s, AVStream *st)
 606 {
 607     ByteIOContext *pb = s->pb;
 608
 609     mxf_write_generic_desc(pb, st, mxf_wav_descriptor_key, 108);
 610
 611     // write audio sampling rate
 612     mxf_write_local_tag(pb, 8, 0x3D03);
 613     put_be32(pb, st->codec->sample_rate);
 614     put_be32(pb, 1);
 615
 616     mxf_write_local_tag(pb, 4, 0x3D07);
 617     put_be32(pb, st->codec->channels);
 618
 619     mxf_write_local_tag(pb, 4, 0x3D01);
 620     put_be32(pb, st->codec->bits_per_coded_sample);
 621 }
 622
 623 static void mxf_write_package(AVFormatContext *s, enum MXFMetadataSetType type)
 624 {
 625     ByteIOContext *pb = s->pb;
 626     int i;
 627
 628     if (type == MaterialPackage) {
 629         mxf_write_metadata_key(pb, 0x013600);
 630         PRINT_KEY(s, "Material Package key", pb->buf_ptr - 16);
 631         klv_encode_ber_length(pb, 92 + 16 * s->nb_streams);
 632     } else {
 633         mxf_write_metadata_key(pb, 0x013700);
 634         PRINT_KEY(s, "Source Package key", pb->buf_ptr - 16);
 635         klv_encode_ber_length(pb, 112 + 16 * s->nb_streams); // 20 bytes length for descriptor reference
 636     }
 637
 638     // write uid
 639     mxf_write_local_tag(pb, 16, 0x3C0A);
 640     mxf_write_uuid(pb, type, 0);
 641     av_log(s,AV_LOG_DEBUG, "package type:%d\n", type);
 642     PRINT_KEY(s, "package uid", pb->buf_ptr - 16);
 643
 644     // write package umid
 645     mxf_write_local_tag(pb, 32, 0x4401);
 646     mxf_write_umid(pb, type, 0);
 647     PRINT_KEY(s, "package umid second part", pb->buf_ptr - 16);
 648
 649     // write create date
 650     mxf_write_local_tag(pb, 8, 0x4405);
 651     put_be64(pb, 0);
 652
 653     // write modified date
 654     mxf_write_local_tag(pb, 8, 0x4404);
 655     put_be64(pb, 0);
 656
 657     // write track refs
 658     mxf_write_local_tag(pb, s->nb_streams * 16 + 8, 0x4403);
 659     mxf_write_refs_count(pb, s->nb_streams);
 660     for (i = 0; i < s->nb_streams; i++)
 661         mxf_write_uuid(pb, type == MaterialPackage ? Track : Track + TypeBottom, i);
 662
 663     // write multiple descriptor reference
 664     if (type == SourcePackage) {
 665         mxf_write_local_tag(pb, 16, 0x4701);
 666         if (s->nb_streams > 1) {
 667             mxf_write_uuid(pb, MultipleDescriptor, 0);
 668             mxf_write_multi_descriptor(s);
 669         } else
 670             mxf_write_uuid(pb, SubDescriptor, 0);
 671     }
 672
 673     for (i = 0; i < s->nb_streams; i++) {
 674         AVStream *st = s->streams[i];
 675         mxf_write_track(s, st, type);
 676         mxf_write_sequence(s, st, type);
 677         mxf_write_structural_component(s, st, type);
 678
 679         if (type == SourcePackage) {
 680             MXFStreamContext *sc = st->priv_data;
 681             mxf_essence_container_uls[sc->index].write_desc(s, st);
 682         }
 683     }
 684 }
 685
 686 static int mxf_write_essence_container_data(AVFormatContext *s)
 687 {
 688     ByteIOContext *pb = s->pb;
 689
 690     mxf_write_metadata_key(pb, 0x012300);
 691     klv_encode_ber_length(pb, 64);
 692
 693     mxf_write_local_tag(pb, 16, 0x3C0A); // Instance UID
 694     mxf_write_uuid(pb, EssenceContainerData, 0);
 695
 696     mxf_write_local_tag(pb, 32, 0x2701); // Linked Package UID
 697     mxf_write_umid(pb, SourcePackage, 0);
 698
 699     mxf_write_local_tag(pb, 4, 0x3F07); // BodySID
 700     put_be32(pb, 1);
 701
 702     return 0;
 703 }
 704
 705 static int mxf_write_header_metadata_sets(AVFormatContext *s)
 706 {
 707     mxf_write_preface(s);
 708     mxf_write_identification(s);
 709     mxf_write_content_storage(s);
 710     mxf_write_package(s, MaterialPackage);
 711     mxf_write_package(s, SourcePackage);
 712     mxf_write_essence_container_data(s);
 713     return 0;
 714 }
 715
 716 static void mxf_write_partition(AVFormatContext *s, int bodysid, const uint8_t *key, int write_metadata)
 717 {
 718     MXFContext *mxf = s->priv_data;
 719     ByteIOContext *pb = s->pb;
 720     int64_t header_byte_count_offset;
 721
 722     // write klv
 723     put_buffer(pb, key, 16);
 724
 725     klv_encode_ber_length(pb, 88 + 16 * mxf->essence_container_count);
 726
 727     // write partition value
 728     put_be16(pb, 1); // majorVersion
 729     put_be16(pb, 2); // minorVersion
 730     put_be32(pb, 1); // kagSize
 731
 732     put_be64(pb, url_ftell(pb) - 25); // thisPartition
 733     put_be64(pb, 0); // previousPartition
 734
 735     put_be64(pb, mxf->footer_partition_offset); // footerPartition
 736
 737     // set offset
 738     header_byte_count_offset = url_ftell(pb);
 739     put_be64(pb, 0); // headerByteCount, update later
 740
 741     // no indexTable
 742     put_be64(pb, 0); // indexByteCount
 743     put_be32(pb, 0); // indexSID
 744     put_be64(pb, 0); // bodyOffset
 745
 746     put_be32(pb, bodysid); // bodySID
 747     put_buffer(pb, op1a_ul, 16); // operational pattern
 748
 749     // essence container
 750     mxf_write_essence_container_refs(s);
 751
 752     if (write_metadata) {
 753         // mark the start of the headermetadata and calculate metadata size
 754         int64_t pos, start = url_ftell(s->pb);
 755         mxf_write_primer_pack(s);
 756         mxf_write_header_metadata_sets(s);
 757         pos = url_ftell(s->pb);
 758         // update header_byte_count
 759         url_fseek(pb, header_byte_count_offset, SEEK_SET);
 760         put_be64(pb, pos - start);
 761         url_fseek(pb, pos, SEEK_SET);
 762     }
 763
 764     put_flush_packet(pb);
 765 }
 766
 767 static const UID mxf_mpeg2_codec_uls[] = {
 768     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x10,0x00 }, // MP-ML I-Frame
 769     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, // MP-ML Long GOP
 770     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, // 422P-ML I-Frame
 771     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, // 422P-ML Long GOP
 772     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x02,0x00 }, // MP-HL I-Frame
 773     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, // MP-HL Long GOP
 774     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, // 422P-HL I-Frame
 775     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, // 422P-HL Long GOP
 776 };
 777
 778 static const UID *mxf_get_mpeg2_codec_ul(AVCodecContext *avctx)
 779 {
 780     if (avctx->profile == 4) { // Main
 781         if (avctx->level == 8) // Main
 782             return avctx->gop_size ?
 783                 &mxf_mpeg2_codec_uls[1] :
 784                 &mxf_mpeg2_codec_uls[0];
 785         else if (avctx->level == 4) // High
 786             return avctx->gop_size ?
 787                 &mxf_mpeg2_codec_uls[5] :
 788                 &mxf_mpeg2_codec_uls[4];
 789     } else if (avctx->profile == 0) { // 422
 790         if (avctx->level == 5) // Main
 791             return avctx->gop_size ?
 792                 &mxf_mpeg2_codec_uls[3] :
 793                 &mxf_mpeg2_codec_uls[2];
 794         else if (avctx->level == 2) // High
 795             return avctx->gop_size ?
 796                 &mxf_mpeg2_codec_uls[7] :
 797                 &mxf_mpeg2_codec_uls[6];
 798     }
 799     return NULL;
 800 }
 801
 802 static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st, AVPacket *pkt)
 803 {
 804     MXFStreamContext *sc = st->priv_data;
 805     uint32_t c = -1;
 806     int i;
 807
 808     for(i = 0; i < pkt->size - 4; i++) {
 809         c = (c<<8) + pkt->data[i];
 810         if (c == 0x1B5) {
 811             if (i + 2 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x10) { // seq ext
 812                 st->codec->profile = pkt->data[i+1] & 0x07;
 813                 st->codec->level   = pkt->data[i+2] >> 4;
 814             } else if (i + 5 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x80) { // pict coding ext
 815                 sc->interlaced = !(pkt->data[i+5] & 0x80); // progressive frame
 816                 break;
 817             }
 818         }
 819     }
 820     sc->codec_ul = mxf_get_mpeg2_codec_ul(st->codec);
 821     return !!sc->codec_ul;
 822 }
 823
 824 static int ff_audio_interleave_init(AVFormatContext *s, const int *samples_per_frame)
 825 {
 826     int i;
 827
 828     if (!samples_per_frame)
 829         samples_per_frame = PAL_samples_per_frame;
 830
 831     for (i = 0; i < s->nb_streams; i++) {
 832         AVStream *st = s->streams[i];
 833         AudioInterleaveContext *aic = st->priv_data;
 834
 835         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 836             aic->sample_size = (st->codec->channels *
 837                                 av_get_bits_per_sample(st->codec->codec_id)) / 8;
 838             if (!aic->sample_size) {
 839                 av_log(s, AV_LOG_ERROR, "could not compute sample size\n");
 840                 return -1;
 841             }
 842             aic->samples_per_frame = samples_per_frame;
 843             aic->samples = aic->samples_per_frame;
 844
 845             av_fifo_init(&aic->fifo, 100 * *aic->samples);
 846         }
 847     }
 848
 849     return 0;
 850 }
 851
 852 static int mxf_write_header(AVFormatContext *s)
 853 {
 854     MXFContext *mxf = s->priv_data;
 855     int i;
 856     uint8_t present[FF_ARRAY_ELEMS(mxf_essence_container_uls)] = {0};
 857     const int *samples_per_frame = NULL;
 858
 859     for (i = 0; i < s->nb_streams; i++) {
 860         AVStream *st = s->streams[i];
 861         MXFStreamContext *sc = av_mallocz(sizeof(*sc));
 862         if (!sc)
 863             return AVERROR(ENOMEM);
 864         st->priv_data = sc;
 865
 866         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 867             if (!av_cmp_q(st->codec->time_base, (AVRational){ 1, 25 })) {
 868                 samples_per_frame = PAL_samples_per_frame;
 869                 mxf->time_base = (AVRational){ 1, 25 };
 870             } else if (!av_cmp_q(st->codec->time_base, (AVRational){ 1001, 30000 })) {
 871                 samples_per_frame = NTSC_samples_per_frame;
 872                 mxf->time_base = (AVRational){ 1001, 30000 };
 873             } else {
 874                 av_log(s, AV_LOG_ERROR, "unsupported video frame rate\n");
 875                 return -1;
 876             }
 877         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 878             if (st->codec->sample_rate != 48000) {
 879                 av_log(s, AV_LOG_ERROR, "only 48khz is implemented\n");
 880                 return -1;
 881             }
 882         }
 883         sc->duration = -1;
 884
 885         sc->index = mxf_get_essence_container_ul_index(st->codec->codec_id);
 886         if (sc->index == -1) {
 887             av_log(s, AV_LOG_ERROR, "track %d: could not find essence container ul, "
 888                    "codec not currently supported in container\n", i);
 889             return -1;
 890         }
 891
 892         sc->codec_ul = &mxf_essence_container_uls[sc->index].codec_ul;
 893
 894         if (!present[sc->index]) {
 895             mxf->essence_containers_indices[mxf->essence_container_count++] = sc->index;
 896             present[sc->index] = 1;
 897         } else
 898             present[sc->index]++;
 899         memcpy(sc->track_essence_element_key, mxf_essence_container_uls[sc->index].element_ul, 15);
 900         sc->track_essence_element_key[15] = present[sc->index];
 901         PRINT_KEY(s, "track essence element key", sc->track_essence_element_key);
 902     }
 903
 904     for (i = 0; i < s->nb_streams; i++) {
 905         MXFStreamContext *sc = s->streams[i]->priv_data;
 906         av_set_pts_info(s->streams[i], 64, mxf->time_base.num, mxf->time_base.den);
 907         // update element count
 908         sc->track_essence_element_key[13] = present[sc->index];
 909         sc->order = AV_RB32(sc->track_essence_element_key+12);
 910     }
 911
 912     if (ff_audio_interleave_init(s, samples_per_frame) < 0)
 913         return -1;
 914
 915     return 0;
 916 }
 917
 918 static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)
 919 {
 920     MXFContext *mxf = s->priv_data;
 921     ByteIOContext *pb = s->pb;
 922     AVStream *st = s->streams[pkt->stream_index];
 923     MXFStreamContext *sc = st->priv_data;
 924
 925     if (!mxf->header_written) {
 926         if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
 927             if (!mxf_parse_mpeg2_frame(s, st, pkt)) {
 928                 av_log(s, AV_LOG_ERROR, "could not get mpeg2 profile and level\n");
 929                 return -1;
 930             }
 931         }
 932         mxf_write_partition(s, 1, header_open_partition_key, 1);
 933         mxf->header_written = 1;
 934     }
 935
 936     put_buffer(pb, sc->track_essence_element_key, 16); // write key
 937     klv_encode_ber_length(pb, pkt->size); // write length
 938     put_buffer(pb, pkt->data, pkt->size); // write value
 939
 940     sc->duration = FFMAX(pkt->pts + pkt->duration, sc->duration);
 941
 942     put_flush_packet(pb);
 943     return 0;
 944 }
 945
 946 static int mxf_write_footer(AVFormatContext *s)
 947 {
 948     MXFContext *mxf = s->priv_data;
 949     ByteIOContext *pb = s->pb;
 950
 951     mxf->footer_partition_offset = url_ftell(pb);
 952     mxf_write_partition(s, 0, footer_partition_key, 0);
 953     if (!url_is_streamed(s->pb)) {
 954         url_fseek(pb, 0, SEEK_SET);
 955         mxf_write_partition(s, 1, header_closed_partition_key, 1);
 956     }
 957     mxf_free(s);
 958     return 0;
 959 }
 960
 961 static int mxf_interleave_new_audio_packet(AVFormatContext *s, AVPacket *pkt,
 962                                            int stream_index, int flush)
 963 {
 964     AVStream *st = s->streams[stream_index];
 965     AudioInterleaveContext *aic = st->priv_data;
 966
 967     int size = FFMIN(av_fifo_size(&aic->fifo), *aic->samples * aic->sample_size);
 968     if (!size || (!flush && size == av_fifo_size(&aic->fifo)))
 969         return 0;
 970
 971     av_new_packet(pkt, size);
 972     av_fifo_read(&aic->fifo, pkt->data, size);
 973
 974     pkt->dts = pkt->pts = aic->dts;
 975     pkt->duration = av_rescale_q(*aic->samples,
 976                                  (AVRational){ 1, st->codec->sample_rate },
 977                                  st->time_base);
 978     pkt->stream_index = stream_index;
 979     aic->dts += pkt->duration;
 980
 981     aic->samples++;
 982     if (!*aic->samples)
 983         aic->samples = aic->samples_per_frame;
 984
 985     return size;
 986 }
 987
 988 static int mxf_interleave_get_packet(AVFormatContext *s, AVPacket *out, int flush)
 989 {
 990     AVPacketList *pktl;
 991     int stream_count = 0;
 992     int streams[MAX_STREAMS];
 993
 994     memset(streams, 0, sizeof(streams));
 995     pktl = s->packet_buffer;
 996     while (pktl) {
 997         //av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);
 998         if (!streams[pktl->pkt.stream_index])
 999             stream_count++;
1000         streams[pktl->pkt.stream_index]++;
1001         pktl = pktl->next;
1002     }
1003
1004     if (stream_count && (s->nb_streams == stream_count || flush)) {
1005         pktl = s->packet_buffer;
1006         *out = pktl->pkt;
1007         //av_log(s, AV_LOG_DEBUG, "out st:%d dts:%lld\n", (*out).stream_index, (*out).dts);
1008         s->packet_buffer = pktl->next;
1009         av_freep(&pktl);
1010
1011         if (flush && stream_count < s->nb_streams) {
1012             // purge packet queue
1013             pktl = s->packet_buffer;
1014             while (pktl) {
1015                 AVPacketList *next = pktl->next;
1016                 av_free_packet(&pktl->pkt);
1017                 av_freep(&pktl);
1018                 pktl = next;
1019             }
1020             s->packet_buffer = NULL;
1021         }
1022
1023         return 1;
1024     } else {
1025         av_init_packet(out);
1026         return 0;
1027     }
1028 }
1029
1030 static int mxf_compare_timestamps(AVFormatContext *s, AVPacket *next, AVPacket *pkt)
1031 {
1032     AVStream *st  = s->streams[pkt ->stream_index];
1033     AVStream *st2 = s->streams[next->stream_index];
1034     MXFStreamContext *sc  = st ->priv_data;
1035     MXFStreamContext *sc2 = st2->priv_data;
1036
1037     int64_t left  = st2->time_base.num * (int64_t)st ->time_base.den;
1038     int64_t right = st ->time_base.num * (int64_t)st2->time_base.den;
1039
1040     return next->dts * left > pkt->dts * right || // FIXME this can overflow
1041         (next->dts * left == pkt->dts * right && sc->order < sc2->order);
1042 }
1043
1044 static int mxf_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
1045 {
1046     int i;
1047
1048     if (pkt) {
1049         AVStream *st = s->streams[pkt->stream_index];
1050         AudioInterleaveContext *aic = st->priv_data;
1051         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
1052             av_fifo_generic_write(&aic->fifo, pkt->data, pkt->size, NULL);
1053         } else {
1054             // rewrite pts and dts to be decoded time line position
1055             pkt->pts = pkt->dts = aic->dts;
1056             aic->dts += pkt->duration;
1057             ff_interleave_add_packet(s, pkt, mxf_compare_timestamps);
1058         }
1059     }
1060
1061     for (i = 0; i < s->nb_streams; i++) {
1062         AVStream *st = s->streams[i];
1063         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
1064             AVPacket new_pkt;
1065             while (mxf_interleave_new_audio_packet(s, &new_pkt, i, flush))
1066                 ff_interleave_add_packet(s, &new_pkt, mxf_compare_timestamps);
1067         }
1068     }
1069
1070     return mxf_interleave_get_packet(s, out, flush);
1071 }
1072
1073 AVOutputFormat mxf_muxer = {
1074     "mxf",
1075     NULL_IF_CONFIG_SMALL("Material eXchange Format"),
1076     NULL,
1077     "mxf",
1078     sizeof(MXFContext),
1079     CODEC_ID_PCM_S16LE,
1080     CODEC_ID_MPEG2VIDEO,
1081     mxf_write_header,
1082     mxf_write_packet,
1083     mxf_write_footer,
1084     0,
1085     NULL,
1086     mxf_interleave,
1087 };
1088
1089