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FFmpeg/libavformat/mxfenc.c

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  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 "mxf.h"

  35. 

  36. typedef struct {

  37.     int local_tag;

  38.     UID uid;

  39. } MXFLocalTagPair;

  40. 

  41. typedef struct {

  42.     UID track_essence_element_key;

  43.     int index; //<<< index in mxf_essence_container_uls table

  44.     const UID *codec_ul;

  45.     int64_t duration;

  46. } MXFStreamContext;

  47. 

  48. typedef struct {

  49.     UID container_ul;

  50.     UID element_ul;

  51.     UID codec_ul;

  52.     enum CodecID id;

  53.     void (*write_desc)();

  54. } MXFContainerEssenceEntry;

  55. 

  56. static void mxf_write_wav_desc(AVFormatContext *s, AVStream *st);

  57. static void mxf_write_mpegvideo_desc(AVFormatContext *s, AVStream *st);

  58. 

  59. static const MXFContainerEssenceEntry mxf_essence_container_uls[] = {

  60.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 },

  61.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

  62.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x00,0x00,0x00 },

  63.       CODEC_ID_MPEG2VIDEO, mxf_write_mpegvideo_desc },

  64.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },

  65.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x01,0x00 },

  66.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },

  67.       CODEC_ID_PCM_S16LE, mxf_write_wav_desc },

  68.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  69.       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  70.       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  71.       CODEC_ID_NONE, NULL },

  72. };

  73. 

  74. typedef struct MXFContext {

  75.     int64_t footer_partition_offset;

  76.     int essence_container_count;

  77.     uint8_t essence_containers_indices[FF_ARRAY_ELEMS(mxf_essence_container_uls)];

  78. } MXFContext;

  79. 

  80. static const uint8_t uuid_base[]            = { 0xAD,0xAB,0x44,0x24,0x2f,0x25,0x4d,0xc7,0x92,0xff,0x29,0xbd };

  81. static const uint8_t umid_base[]            = { 0x06,0x0A,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x01,0x0D,0x00,0x13,0x00,0x00,0x00 };

  82. 

  83. /**

  84.  * complete key for operation pattern, partitions, and primer pack

  85.  */

  86. static const uint8_t op1a_ul[]              = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x01,0x01,0x00 };

  87. static const uint8_t footer_partition_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }; // ClosedComplete

  88. static const uint8_t primer_pack_key[]      = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x05,0x01,0x00 };

  89. 

  90. 

  91. 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

  92. 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

  93. 

  94. /**

  95.  * partial key for header metadata

  96.  */

  97. static const uint8_t header_metadata_key[]  = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0D,0x01,0x01,0x01,0x01 };

  98. 

  99. static const uint8_t multiple_desc_ul[] = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x0D,0x01,0x03,0x01,0x02,0x7F,0x01,0x00 };

  100. 

  101. /**

  102.  * SMPTE RP210 http://www.smpte-ra.org/mdd/index.html

  103.  */

  104. static const MXFLocalTagPair mxf_local_tag_batch[] = {

  105.     // preface set

  106.     { 0x3C0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x02,0x00,0x00,0x00,0x00}}, /* Instance UID */

  107.     { 0x3B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x04,0x00,0x00}}, /* Last Modified Date */

  108.     { 0x3B05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x03,0x01,0x02,0x01,0x05,0x00,0x00,0x00}}, /* Version */

  109.     { 0x3B06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x04,0x00,0x00}}, /* Identifications reference */

  110.     { 0x3B03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x01,0x00,0x00}}, /* Content Storage reference */

  111.     { 0x3B09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x03,0x00,0x00,0x00,0x00}}, /* Operational Pattern UL */

  112.     { 0x3B0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x01,0x00,0x00}}, /* Essence Containers UL batch */

  113.     { 0x3B0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x02,0x00,0x00}}, /* DM Schemes UL batch */

  114.     // Identification

  115.     { 0x3C09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x01,0x00,0x00,0x00}}, /* This Generation UID */

  116.     { 0x3C01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x02,0x01,0x00,0x00}}, /* Company Name */

  117.     { 0x3C02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x03,0x01,0x00,0x00}}, /* Product Name */

  118.     { 0x3C04, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x05,0x01,0x00,0x00}}, /* Version String */

  119.     { 0x3C05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x07,0x00,0x00,0x00}}, /* Product ID */

  120.     { 0x3C06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x03,0x00,0x00}}, /* Modification Date */

  121.     // Content Storage

  122.     { 0x1901, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x01,0x00,0x00}}, /* Package strong reference batch */

  123.     { 0x1902, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x02,0x00,0x00}}, /* Package strong reference batch */

  124.     // Essence Container Data

  125.     { 0x2701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x06,0x01,0x00,0x00,0x00}}, /* Linked Package UID */

  126.     { 0x3F07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x04,0x00,0x00,0x00,0x00}}, /* BodySID */

  127.     // Package

  128.     { 0x4401, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x10,0x00,0x00,0x00,0x00}}, /* Package UID */

  129.     { 0x4405, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x01,0x03,0x00,0x00}}, /* Package Creation Date */

  130.     { 0x4404, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x05,0x00,0x00}}, /* Package Modified Date */

  131.     { 0x4403, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x05,0x00,0x00}}, /* Tracks Strong reference array */

  132.     { 0x4701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x03,0x00,0x00}}, /* Descriptor */

  133.     // Track

  134.     { 0x4801, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x07,0x01,0x01,0x00,0x00,0x00,0x00}}, /* Track ID */

  135.     { 0x4804, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x04,0x01,0x03,0x00,0x00,0x00,0x00}}, /* Track Number */

  136.     { 0x4B01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x30,0x04,0x05,0x00,0x00,0x00,0x00}}, /* Edit Rate */

  137.     { 0x4B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x03,0x00,0x00}}, /* Origin */

  138.     { 0x4803, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x04,0x00,0x00}}, /* Sequence reference */

  139.     // Sequence

  140.     { 0x0201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x07,0x01,0x00,0x00,0x00,0x00,0x00}}, /* Data Definition UL */

  141.     { 0x0202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x02,0x01,0x01,0x03,0x00,0x00}}, /* Duration */

  142.     { 0x1001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x09,0x00,0x00}}, /* Structural Components reference array */

  143.     // Source Clip

  144.     { 0x1201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x01,0x03,0x01,0x04,0x00,0x00}}, /* Start position */

  145.     { 0x1101, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x01,0x00,0x00,0x00}}, /* SourcePackageID */

  146.     { 0x1102, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x02,0x00,0x00,0x00}}, /* SourceTrackID */

  147.     // File Descriptor

  148.     { 0x3F01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x04,0x06,0x0B,0x00,0x00}}, /* Sub Descriptors reference array */

  149.     { 0x3006, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x06,0x01,0x01,0x03,0x05,0x00,0x00,0x00}}, /* Linked Track ID */

  150.     { 0x3001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x00,0x00,0x00,0x00}}, /* SampleRate */

  151.     { 0x3004, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x01,0x02,0x00,0x00}}, /* Essence Container */

  152.     // Generic Picture Essence Descriptor

  153.     { 0x3203, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x02,0x00,0x00,0x00}}, /* Stored Width */

  154.     { 0x3202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x01,0x00,0x00,0x00}}, /* Stored Height */

  155.     { 0x320E, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x01,0x01,0x01,0x00,0x00,0x00}}, /* Aspect Ratio */

  156.     { 0x3201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x06,0x01,0x00,0x00,0x00,0x00}}, /* Picture Essence Coding */

  157.     // Generic Sound Essence Descriptor

  158.     { 0x3D03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x01,0x01,0x00,0x00}}, /* Audio sampling rate */

  159.     { 0x3D07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x01,0x01,0x04,0x00,0x00,0x00}}, /* ChannelCount */

  160.     { 0x3D01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x03,0x04,0x00,0x00,0x00}}, /* Quantization bits */

  161.     { 0x3D06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x02,0x04,0x02,0x00,0x00,0x00,0x00}}, /* Sound Essence Compression */

  162. };

  163. 

  164. static void mxf_write_uuid(ByteIOContext *pb, enum MXFMetadataSetType type, int value)

  165. {

  166.     put_buffer(pb, uuid_base, 12);

  167.     put_be16(pb, type);

  168.     put_be16(pb, value);

  169. }

  170. 

  171. static void mxf_write_umid(ByteIOContext *pb, enum MXFMetadataSetType type, int value)

  172. {

  173.     put_buffer(pb, umid_base, 16);

  174.     mxf_write_uuid(pb, type, value);

  175. }

  176. 

  177. static void mxf_write_refs_count(ByteIOContext *pb, int ref_count)

  178. {

  179.     put_be32(pb, ref_count);

  180.     put_be32(pb, 16);

  181. }

  182. 

  183. static int klv_encode_ber_length(ByteIOContext *pb, uint64_t len)

  184. {

  185.     // Determine the best BER size

  186.     int size;

  187.     if (len < 128) {

  188.         //short form

  189.         put_byte(pb, len);

  190.         return 1;

  191.     }

  192. 

  193.     size = (av_log2(len) >> 3) + 1;

  194. 

  195.     // long form

  196.     put_byte(pb, 0x80 + size);

  197.     while(size) {

  198.         size --;

  199.         put_byte(pb, len >> 8 * size & 0xff);

  200.     }

  201.     return 0;

  202. }

  203. 

  204. /*

  205.  * Get essence container ul index

  206.  */

  207. static int mxf_get_essence_container_ul_index(enum CodecID id)

  208. {

  209.     int i;

  210.     for (i = 0; i < FF_ARRAY_ELEMS(mxf_essence_container_uls); i++)

  211.         if (mxf_essence_container_uls[i].id == id)

  212.             return i;

  213.     return -1;

  214. }

  215. 

  216. static void mxf_write_primer_pack(AVFormatContext *s)

  217. {

  218.     ByteIOContext *pb = s->pb;

  219.     int local_tag_number, i = 0;

  220. 

  221.     local_tag_number = FF_ARRAY_ELEMS(mxf_local_tag_batch);

  222. 

  223.     put_buffer(pb, primer_pack_key, 16);

  224.     klv_encode_ber_length(pb, local_tag_number * 18 + 8);

  225. 

  226.     put_be32(pb, local_tag_number); // local_tag num

  227.     put_be32(pb, 18); // item size, always 18 according to the specs

  228. 

  229.     for (i = 0; i < local_tag_number; i++) {

  230.         put_be16(pb, mxf_local_tag_batch[i].local_tag);

  231.         put_buffer(pb, mxf_local_tag_batch[i].uid, 16);

  232.     }

  233. }

  234. 

  235. static void mxf_write_local_tag(ByteIOContext *pb, int size, int tag)

  236. {

  237.     put_be16(pb, tag);

  238.     put_be16(pb, size);

  239. }

  240. 

  241. static void mxf_write_metadata_key(ByteIOContext *pb, unsigned int value)

  242. {

  243.     put_buffer(pb, header_metadata_key, 13);

  244.     put_be24(pb, value);

  245. }

  246. 

  247. static void mxf_free(AVFormatContext *s)

  248. {

  249.     int i;

  250. 

  251.     for (i = 0; i < s->nb_streams; i++) {

  252.         AVStream *st = s->streams[i];

  253.         av_freep(&st->priv_data);

  254.     }

  255. }

  256. 

  257. static const MXFDataDefinitionUL *mxf_get_data_definition_ul(enum CodecType type)

  258. {

  259.     const MXFDataDefinitionUL *uls = ff_mxf_data_definition_uls;

  260.     while (uls->type != CODEC_TYPE_DATA) {

  261.         if (type == uls->type)

  262.             break;

  263.         uls++;

  264.     }

  265.     return uls;

  266. }

  267. 

  268. static void mxf_write_essence_container_refs(AVFormatContext *s)

  269. {

  270.     MXFContext *c = s->priv_data;

  271.     ByteIOContext *pb = s->pb;

  272.     int i;

  273. 

  274.     mxf_write_refs_count(pb, c->essence_container_count);

  275.     av_log(s,AV_LOG_DEBUG, "essence container count:%d\n", c->essence_container_count);

  276.     for (i = 0; i < c->essence_container_count; i++) {

  277.         put_buffer(pb, mxf_essence_container_uls[c->essence_containers_indices[i]].container_ul, 16);

  278.         PRINT_KEY(s, "essence container ul:\n", mxf_essence_container_uls[c->essence_containers_indices[i]].container_ul);

  279.     }

  280. }

  281. 

  282. static void mxf_write_preface(AVFormatContext *s)

  283. {

  284.     MXFContext *mxf = s->priv_data;

  285.     ByteIOContext *pb = s->pb;

  286. 

  287.     mxf_write_metadata_key(pb, 0x012f00);

  288.     PRINT_KEY(s, "preface key", pb->buf_ptr - 16);

  289.     klv_encode_ber_length(pb, 130 + 16 * mxf->essence_container_count);

  290. 

  291.     // write preface set uid

  292.     mxf_write_local_tag(pb, 16, 0x3C0A);

  293.     mxf_write_uuid(pb, Preface, 0);

  294.     PRINT_KEY(s, "preface uid", pb->buf_ptr - 16);

  295. 

  296.     // write create date as unknown

  297.     mxf_write_local_tag(pb, 8, 0x3B02);

  298.     put_be64(pb, 0);

  299. 

  300.     // write version

  301.     mxf_write_local_tag(pb, 2, 0x3B05);

  302.     put_be16(pb, 1);

  303. 

  304.     // write identification_refs

  305.     mxf_write_local_tag(pb, 16 + 8, 0x3B06);

  306.     mxf_write_refs_count(pb, 1);

  307.     mxf_write_uuid(pb, Identification, 0);

  308. 

  309.     // write content_storage_refs

  310.     mxf_write_local_tag(pb, 16, 0x3B03);

  311.     mxf_write_uuid(pb, ContentStorage, 0);

  312. 

  313.     mxf_write_local_tag(pb, 16, 0x3B09);

  314.     put_buffer(pb, op1a_ul, 16);

  315. 

  316.     // write essence_container_refs

  317.     mxf_write_local_tag(pb, 8 + 16 * mxf->essence_container_count, 0x3B0A);

  318.     mxf_write_essence_container_refs(s);

  319. 

  320.     // write dm_scheme_refs

  321.     mxf_write_local_tag(pb, 8, 0x3B0B);

  322.     put_be64(pb, 0);

  323. }

  324. 

  325. /*

  326.  * Write a local tag containing an ascii string as utf-16

  327.  */

  328. static void mxf_write_local_tag_utf16(ByteIOContext *pb, int tag, const char *value)

  329. {

  330.     int i, size = strlen(value);

  331.     mxf_write_local_tag(pb, size*2, tag);

  332.     for (i = 0; i < size; i++)

  333.         put_be16(pb, value[i]);

  334. }

  335. 

  336. static void mxf_write_identification(AVFormatContext *s)

  337. {

  338.     ByteIOContext *pb = s->pb;

  339.     const char *company = "FFmpeg";

  340.     const char *product = "OP1a Muxer";

  341.     const char *version;

  342.     int length;

  343. 

  344.     mxf_write_metadata_key(pb, 0x013000);

  345.     PRINT_KEY(s, "identification key", pb->buf_ptr - 16);

  346. 

  347.     version = s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT ?

  348.         "0.0.0" : AV_STRINGIFY(LIBAVFORMAT_VERSION);

  349.     length = 84 + (strlen(company)+strlen(product)+strlen(version))*2; // utf-16

  350.     klv_encode_ber_length(pb, length);

  351. 

  352.     // write uid

  353.     mxf_write_local_tag(pb, 16, 0x3C0A);

  354.     mxf_write_uuid(pb, Identification, 0);

  355.     PRINT_KEY(s, "identification uid", pb->buf_ptr - 16);

  356. 

  357.     // write generation uid

  358.     mxf_write_local_tag(pb, 16, 0x3C09);

  359.     mxf_write_uuid(pb, Identification, 1);

  360. 

  361.     mxf_write_local_tag_utf16(pb, 0x3C01, company); // Company Name

  362.     mxf_write_local_tag_utf16(pb, 0x3C02, product); // Product Name

  363.     mxf_write_local_tag_utf16(pb, 0x3C04, version); // Version String

  364. 

  365.     // write product uid

  366.     mxf_write_local_tag(pb, 16, 0x3C05);

  367.     mxf_write_uuid(pb, Identification, 2);

  368. 

  369.     // write modified date

  370.     mxf_write_local_tag(pb, 8, 0x3C06);

  371.     put_be64(pb, 0);

  372. }

  373. 

  374. static void mxf_write_content_storage(AVFormatContext *s)

  375. {

  376.     ByteIOContext *pb = s->pb;

  377. 

  378.     mxf_write_metadata_key(pb, 0x011800);

  379.     PRINT_KEY(s, "content storage key", pb->buf_ptr - 16);

  380.     klv_encode_ber_length(pb, 92);

  381. 

  382.     // write uid

  383.     mxf_write_local_tag(pb, 16, 0x3C0A);

  384.     mxf_write_uuid(pb, ContentStorage, 0);

  385.     PRINT_KEY(s, "content storage uid", pb->buf_ptr - 16);

  386. 

  387.     // write package reference

  388.     mxf_write_local_tag(pb, 16 * 2 + 8, 0x1901);

  389.     mxf_write_refs_count(pb, 2);

  390.     mxf_write_uuid(pb, MaterialPackage, 0);

  391.     mxf_write_uuid(pb, SourcePackage, 0);

  392. 

  393.     // write essence container data

  394.     mxf_write_local_tag(pb, 8 + 16, 0x1902);

  395.     mxf_write_refs_count(pb, 1);

  396.     mxf_write_uuid(pb, EssenceContainerData, 0);

  397. }

  398. 

  399. static void mxf_write_track(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)

  400. {

  401.     ByteIOContext *pb = s->pb;

  402.     MXFStreamContext *sc = st->priv_data;

  403. 

  404.     mxf_write_metadata_key(pb, 0x013b00);

  405.     PRINT_KEY(s, "track key", pb->buf_ptr - 16);

  406.     klv_encode_ber_length(pb, 80);

  407. 

  408.     // write track uid

  409.     mxf_write_local_tag(pb, 16, 0x3C0A);

  410.     mxf_write_uuid(pb, type == MaterialPackage ? Track : Track + TypeBottom, st->index);

  411.     PRINT_KEY(s, "track uid", pb->buf_ptr - 16);

  412. 

  413.     // write track id

  414.     mxf_write_local_tag(pb, 4, 0x4801);

  415.     put_be32(pb, st->index);

  416. 

  417.     // write track number

  418.     mxf_write_local_tag(pb, 4, 0x4804);

  419.     if (type == MaterialPackage)

  420.         put_be32(pb, 0); // track number of material package is 0

  421.     else

  422.         put_buffer(pb, sc->track_essence_element_key + 12, 4);

  423. 

  424.     mxf_write_local_tag(pb, 8, 0x4B01);

  425.     put_be32(pb, st->time_base.den);

  426.     put_be32(pb, st->time_base.num);

  427. 

  428.     // write origin

  429.     mxf_write_local_tag(pb, 8, 0x4B02);

  430.     put_be64(pb, 0);

  431. 

  432.     // write sequence refs

  433.     mxf_write_local_tag(pb, 16, 0x4803);

  434.     mxf_write_uuid(pb, type == MaterialPackage ? Sequence: Sequence + TypeBottom, st->index);

  435. }

  436. 

  437. static void mxf_write_common_fields(ByteIOContext *pb, AVStream *st)

  438. {

  439.     const MXFDataDefinitionUL *data_def_ul = mxf_get_data_definition_ul(st->codec->codec_type);

  440.     MXFStreamContext *sc = st->priv_data;

  441. 

  442.     // find data define uls

  443.     mxf_write_local_tag(pb, 16, 0x0201);

  444.     put_buffer(pb, data_def_ul->uid, 16);

  445. 

  446.     // write duration

  447.     mxf_write_local_tag(pb, 8, 0x0202);

  448.     put_be64(pb, sc->duration);

  449. }

  450. 

  451. static void mxf_write_sequence(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)

  452. {

  453.     ByteIOContext *pb = s->pb;

  454. 

  455.     mxf_write_metadata_key(pb, 0x010f00);

  456.     PRINT_KEY(s, "sequence key", pb->buf_ptr - 16);

  457.     klv_encode_ber_length(pb, 80);

  458. 

  459.     mxf_write_local_tag(pb, 16, 0x3C0A);

  460.     mxf_write_uuid(pb, type == MaterialPackage ? Sequence: Sequence + TypeBottom, st->index);

  461. 

  462.     PRINT_KEY(s, "sequence uid", pb->buf_ptr - 16);

  463.     mxf_write_common_fields(pb, st);

  464. 

  465.     // write structural component

  466.     mxf_write_local_tag(pb, 16 + 8, 0x1001);

  467.     mxf_write_refs_count(pb, 1);

  468.     mxf_write_uuid(pb, type == MaterialPackage ? SourceClip: SourceClip + TypeBottom, st->index);

  469. }

  470. 

  471. static void mxf_write_structural_component(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)

  472. {

  473.     ByteIOContext *pb = s->pb;

  474.     int i;

  475. 

  476.     mxf_write_metadata_key(pb, 0x011100);

  477.     PRINT_KEY(s, "sturctural component key", pb->buf_ptr - 16);

  478.     klv_encode_ber_length(pb, 108);

  479. 

  480.     // write uid

  481.     mxf_write_local_tag(pb, 16, 0x3C0A);

  482.     mxf_write_uuid(pb, type == MaterialPackage ? SourceClip: SourceClip + TypeBottom, st->index);

  483. 

  484.     PRINT_KEY(s, "structural component uid", pb->buf_ptr - 16);

  485.     mxf_write_common_fields(pb, st);

  486. 

  487.     // write start_position

  488.     mxf_write_local_tag(pb, 8, 0x1201);

  489.     put_be64(pb, 0);

  490. 

  491.     // write source package uid, end of the reference

  492.     mxf_write_local_tag(pb, 32, 0x1101);

  493.     if (type == SourcePackage) {

  494.         for (i = 0; i < 4; i++)

  495.             put_be64(pb, 0);

  496.     } else

  497.         mxf_write_umid(pb, SourcePackage, 0);

  498. 

  499.     // write source track id

  500.     mxf_write_local_tag(pb, 4, 0x1102);

  501.     if (type == SourcePackage)

  502.         put_be32(pb, 0);

  503.     else

  504.         put_be32(pb, st->index);

  505. }

  506. 

  507. static void mxf_write_multi_descriptor(AVFormatContext *s)

  508. {

  509.     ByteIOContext *pb = s->pb;

  510.     int i;

  511. 

  512.     mxf_write_metadata_key(pb, 0x014400);

  513.     PRINT_KEY(s, "multiple descriptor key", pb->buf_ptr - 16);

  514.     klv_encode_ber_length(pb, 64 + 16 * s->nb_streams);

  515. 

  516.     mxf_write_local_tag(pb, 16, 0x3C0A);

  517.     mxf_write_uuid(pb, MultipleDescriptor, 0);

  518.     PRINT_KEY(s, "multi_desc uid", pb->buf_ptr - 16);

  519. 

  520.     // write sample rate

  521.     mxf_write_local_tag(pb, 8, 0x3001);

  522.     put_be32(pb, s->streams[0]->time_base.den);

  523.     put_be32(pb, s->streams[0]->time_base.num);

  524. 

  525.     // write essence container ul

  526.     mxf_write_local_tag(pb, 16, 0x3004);

  527.     put_buffer(pb, multiple_desc_ul, 16);

  528. 

  529.     // write sub descriptor refs

  530.     mxf_write_local_tag(pb, s->nb_streams * 16 + 8, 0x3F01);

  531.     mxf_write_refs_count(pb, s->nb_streams);

  532.     for (i = 0; i < s->nb_streams; i++)

  533.         mxf_write_uuid(pb, SubDescriptor, i);

  534. }

  535. 

  536. static void mxf_write_generic_desc(ByteIOContext *pb, AVStream *st, const UID key)

  537. {

  538.     MXFStreamContext *sc = st->priv_data;

  539. 

  540.     put_buffer(pb, key, 16);

  541.     klv_encode_ber_length(pb, 108);

  542. 

  543.     mxf_write_local_tag(pb, 16, 0x3C0A);

  544.     mxf_write_uuid(pb, SubDescriptor, st->index);

  545. 

  546.     mxf_write_local_tag(pb, 4, 0x3006);

  547.     put_be32(pb, st->index);

  548. 

  549.     mxf_write_local_tag(pb, 8, 0x3001);

  550.     put_be32(pb, st->time_base.den);

  551.     put_be32(pb, st->time_base.num);

  552. 

  553.     mxf_write_local_tag(pb, 16, 0x3004);

  554.     put_buffer(pb, mxf_essence_container_uls[sc->index].container_ul, 16);

  555. 

  556.     mxf_write_local_tag(pb, 16, 0x3201);

  557.     put_buffer(pb, *sc->codec_ul, 16);

  558. }

  559. 

  560. static const UID mxf_mpegvideo_descriptor_key = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 };

  561. static const UID mxf_wav_descriptor_key       = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 };

  562. 

  563. static void mxf_write_mpegvideo_desc(AVFormatContext *s, AVStream *st)

  564. {

  565.     ByteIOContext *pb = s->pb;

  566.     int stored_height = (st->codec->height+15)/16*16;

  567.     AVRational dar;

  568. 

  569.     mxf_write_generic_desc(pb, st, mxf_mpegvideo_descriptor_key);

  570. 

  571.     mxf_write_local_tag(pb, 4, 0x3203);

  572.     put_be32(pb, st->codec->width);

  573. 

  574.     mxf_write_local_tag(pb, 4, 0x3202);

  575.     put_be32(pb, stored_height);

  576. 

  577.     av_reduce(&dar.num, &dar.den,

  578.               st->codec->width*st->codec->sample_aspect_ratio.num,

  579.               st->codec->height*st->codec->sample_aspect_ratio.den,

  580.               1024*1024);

  581. 

  582.     mxf_write_local_tag(pb, 8, 0x320E);

  583.     put_be32(pb, dar.num);

  584.     put_be32(pb, dar.den);

  585. }

  586. 

  587. static void mxf_write_wav_desc(AVFormatContext *s, AVStream *st)

  588. {

  589.     ByteIOContext *pb = s->pb;

  590. 

  591.     mxf_write_generic_desc(pb, st, mxf_wav_descriptor_key);

  592. 

  593.     // write audio sampling rate

  594.     mxf_write_local_tag(pb, 8, 0x3D03);

  595.     put_be32(pb, st->codec->sample_rate);

  596.     put_be32(pb, 1);

  597. 

  598.     mxf_write_local_tag(pb, 4, 0x3D07);

  599.     put_be32(pb, st->codec->channels);

  600. 

  601.     mxf_write_local_tag(pb, 4, 0x3D01);

  602.     put_be32(pb, st->codec->bits_per_coded_sample);

  603. }

  604. 

  605. static void mxf_write_package(AVFormatContext *s, enum MXFMetadataSetType type)

  606. {

  607.     ByteIOContext *pb = s->pb;

  608.     int i;

  609. 

  610.     if (type == MaterialPackage) {

  611.         mxf_write_metadata_key(pb, 0x013600);

  612.         PRINT_KEY(s, "Material Package key", pb->buf_ptr - 16);

  613.         klv_encode_ber_length(pb, 92 + 16 * s->nb_streams);

  614.     } else {

  615.         mxf_write_metadata_key(pb, 0x013700);

  616.         PRINT_KEY(s, "Source Package key", pb->buf_ptr - 16);

  617.         klv_encode_ber_length(pb, 112 + 16 * s->nb_streams); // 20 bytes length for descriptor reference

  618.     }

  619. 

  620.     // write uid

  621.     mxf_write_local_tag(pb, 16, 0x3C0A);

  622.     mxf_write_uuid(pb, type, 0);

  623.     av_log(s,AV_LOG_DEBUG, "package type:%d\n", type);

  624.     PRINT_KEY(s, "package uid", pb->buf_ptr - 16);

  625. 

  626.     // write package umid

  627.     mxf_write_local_tag(pb, 32, 0x4401);

  628.     mxf_write_umid(pb, type, 0);

  629.     PRINT_KEY(s, "package umid second part", pb->buf_ptr - 16);

  630. 

  631.     // write create date

  632.     mxf_write_local_tag(pb, 8, 0x4405);

  633.     put_be64(pb, 0);

  634. 

  635.     // write modified date

  636.     mxf_write_local_tag(pb, 8, 0x4404);

  637.     put_be64(pb, 0);

  638. 

  639.     // write track refs

  640.     mxf_write_local_tag(pb, s->nb_streams * 16 + 8, 0x4403);

  641.     mxf_write_refs_count(pb, s->nb_streams);

  642.     for (i = 0; i < s->nb_streams; i++)

  643.         mxf_write_uuid(pb, type == MaterialPackage ? Track : Track + TypeBottom, i);

  644. 

  645.     // write multiple descriptor reference

  646.     if (type == SourcePackage) {

  647.         mxf_write_local_tag(pb, 16, 0x4701);

  648.         if (s->nb_streams > 1) {

  649.             mxf_write_uuid(pb, MultipleDescriptor, 0);

  650.             mxf_write_multi_descriptor(s);

  651.         } else

  652.             mxf_write_uuid(pb, SubDescriptor, 0);

  653.     }

  654. 

  655.     for (i = 0; i < s->nb_streams; i++) {

  656.         AVStream *st = s->streams[i];

  657.         mxf_write_track(s, st, type);

  658.         mxf_write_sequence(s, st, type);

  659.         mxf_write_structural_component(s, st, type);

  660. 

  661.         if (type == SourcePackage) {

  662.             MXFStreamContext *sc = st->priv_data;

  663.             mxf_essence_container_uls[sc->index].write_desc(s, st);

  664.         }

  665.     }

  666. }

  667. 

  668. static int mxf_write_essence_container_data(AVFormatContext *s)

  669. {

  670.     ByteIOContext *pb = s->pb;

  671. 

  672.     mxf_write_metadata_key(pb, 0x012300);

  673.     klv_encode_ber_length(pb, 64);

  674. 

  675.     mxf_write_local_tag(pb, 16, 0x3C0A); // Instance UID

  676.     mxf_write_uuid(pb, EssenceContainerData, 0);

  677. 

  678.     mxf_write_local_tag(pb, 32, 0x2701); // Linked Package UID

  679.     mxf_write_umid(pb, SourcePackage, 0);

  680. 

  681.     mxf_write_local_tag(pb, 4, 0x3F07); // BodySID

  682.     put_be32(pb, 1);

  683. 

  684.     return 0;

  685. }

  686. 

  687. static int mxf_write_header_metadata_sets(AVFormatContext *s)

  688. {

  689.     mxf_write_preface(s);

  690.     mxf_write_identification(s);

  691.     mxf_write_content_storage(s);

  692.     mxf_write_package(s, MaterialPackage);

  693.     mxf_write_package(s, SourcePackage);

  694.     mxf_write_essence_container_data(s);

  695.     return 0;

  696. }

  697. 

  698. static void mxf_write_partition(AVFormatContext *s, int bodysid, const uint8_t *key, int write_metadata)

  699. {

  700.     MXFContext *mxf = s->priv_data;

  701.     ByteIOContext *pb = s->pb;

  702.     int64_t header_byte_count_offset;

  703. 

  704.     // write klv

  705.     put_buffer(pb, key, 16);

  706. 

  707.     klv_encode_ber_length(pb, 88 + 16 * mxf->essence_container_count);

  708. 

  709.     // write partition value

  710.     put_be16(pb, 1); // majorVersion

  711.     put_be16(pb, 2); // minorVersion

  712.     put_be32(pb, 1); // kagSize

  713. 

  714.     put_be64(pb, url_ftell(pb) - 25); // thisPartition

  715.     put_be64(pb, 0); // previousPartition

  716. 

  717.     put_be64(pb, mxf->footer_partition_offset); // footerPartition

  718. 

  719.     // set offset

  720.     header_byte_count_offset = url_ftell(pb);

  721.     put_be64(pb, 0); // headerByteCount, update later

  722. 

  723.     // no indexTable

  724.     put_be64(pb, 0); // indexByteCount

  725.     put_be32(pb, 0); // indexSID

  726.     put_be64(pb, 0); // bodyOffset

  727. 

  728.     put_be32(pb, bodysid); // bodySID

  729.     put_buffer(pb, op1a_ul, 16); // operational pattern

  730. 

  731.     // essence container

  732.     mxf_write_essence_container_refs(s);

  733. 

  734.     if (write_metadata) {

  735.         // mark the start of the headermetadata and calculate metadata size

  736.         int64_t pos, start = url_ftell(s->pb);

  737.         mxf_write_primer_pack(s);

  738.         mxf_write_header_metadata_sets(s);

  739.         pos = url_ftell(s->pb);

  740.         // update header_byte_count

  741.         url_fseek(pb, header_byte_count_offset, SEEK_SET);

  742.         put_be64(pb, pos - start);

  743.         url_fseek(pb, pos, SEEK_SET);

  744.     }

  745. 

  746.     put_flush_packet(pb);

  747. }

  748. 

  749. static const UID mxf_mpeg2_codec_uls[] = {

  750.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x10,0x00 }, // MP-ML I-Frame

  751.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, // MP-ML Long GOP

  752.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, // 422P-ML I-Frame

  753.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, // 422P-ML Long GOP

  754.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x02,0x00 }, // MP-HL I-Frame

  755.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, // MP-HL Long GOP

  756.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, // 422P-HL I-Frame

  757.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, // 422P-HL Long GOP

  758. };

  759. 

  760. static const UID *mxf_get_mpeg2_codec_ul(AVCodecContext *avctx)

  761. {

  762.     if (avctx->profile == 4) { // Main

  763.         if (avctx->level == 8) // Main

  764.             return avctx->gop_size ?

  765.                 &mxf_mpeg2_codec_uls[1] :

  766.                 &mxf_mpeg2_codec_uls[0];

  767.         else if (avctx->level == 4) // High

  768.             return avctx->gop_size ?

  769.                 &mxf_mpeg2_codec_uls[5] :

  770.                 &mxf_mpeg2_codec_uls[4];

  771.     } else if (avctx->profile == 0) { // 422

  772.         if (avctx->level == 5) // Main

  773.             return avctx->gop_size ?

  774.                 &mxf_mpeg2_codec_uls[3] :

  775.                 &mxf_mpeg2_codec_uls[2];

  776.         else if (avctx->level == 2) // High

  777.             return avctx->gop_size ?

  778.                 &mxf_mpeg2_codec_uls[7] :

  779.                 &mxf_mpeg2_codec_uls[6];

  780.     }

  781.     return NULL;

  782. }

  783. 

  784. static int mxf_write_header(AVFormatContext *s)

  785. {

  786.     MXFContext *mxf = s->priv_data;

  787.     int i;

  788.     uint8_t present[FF_ARRAY_ELEMS(mxf_essence_container_uls)] = {0};

  789. 

  790.     for (i = 0; i < s->nb_streams; i++) {

  791.         AVStream *st = s->streams[i];

  792.         MXFStreamContext *sc = av_mallocz(sizeof(*sc));

  793.         if (!sc)

  794.             return AVERROR(ENOMEM);

  795.         st->priv_data = sc;

  796.         // set pts information

  797.         if (st->codec->codec_type == CODEC_TYPE_VIDEO)

  798.             av_set_pts_info(st, 64, 1, st->codec->time_base.den);

  799.         else if (st->codec->codec_type == CODEC_TYPE_AUDIO)

  800.             av_set_pts_info(st, 64, 1, st->codec->sample_rate);

  801.         sc->duration = -1;

  802. 

  803.         sc->index = mxf_get_essence_container_ul_index(st->codec->codec_id);

  804.         if (sc->index == -1) {

  805.             av_log(s, AV_LOG_ERROR, "track %d: could not find essence container ul, "

  806.                    "codec not currently supported in container\n", i);

  807.             return -1;

  808.         }

  809. 

  810.         if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {

  811.             if (st->codec->profile == FF_PROFILE_UNKNOWN ||

  812.                 st->codec->level == FF_LEVEL_UNKNOWN) {

  813.                 av_log(s, AV_LOG_ERROR, "track %d: profile and level must be set for mpeg-2\n", i);

  814.                 return -1;

  815.             }

  816.             sc->codec_ul = mxf_get_mpeg2_codec_ul(st->codec);

  817.             if (!sc->codec_ul) {

  818.                 av_log(s, AV_LOG_ERROR, "track %d: could not find codec ul for mpeg-2, "

  819.                        "unsupported profile/level\n", i);

  820.                 return -1;

  821.             }

  822.         } else

  823.             sc->codec_ul = &mxf_essence_container_uls[sc->index].codec_ul;

  824. 

  825.         if (!present[sc->index]) {

  826.             mxf->essence_containers_indices[mxf->essence_container_count++] = sc->index;

  827.             present[sc->index] = 1;

  828.         } else

  829.             present[sc->index]++;

  830.         memcpy(sc->track_essence_element_key, mxf_essence_container_uls[sc->index].element_ul, 15);

  831.         sc->track_essence_element_key[15] = present[sc->index];

  832.         PRINT_KEY(s, "track essence element key", sc->track_essence_element_key);

  833.     }

  834. 

  835.     mxf_write_partition(s, 1, header_open_partition_key, 1);

  836. 

  837.     return 0;

  838. }

  839. 

  840. static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)

  841. {

  842.     ByteIOContext *pb = s->pb;

  843.     AVStream *st = s->streams[pkt->stream_index];

  844.     MXFStreamContext *sc = st->priv_data;

  845. 

  846.     put_buffer(pb, sc->track_essence_element_key, 16); // write key

  847.     klv_encode_ber_length(pb, pkt->size); // write length

  848.     put_buffer(pb, pkt->data, pkt->size); // write value

  849. 

  850.     sc->duration = FFMAX(pkt->pts + pkt->duration, sc->duration);

  851. 

  852.     put_flush_packet(pb);

  853.     return 0;

  854. }

  855. 

  856. static int mxf_write_footer(AVFormatContext *s)

  857. {

  858.     MXFContext *mxf = s->priv_data;

  859.     ByteIOContext *pb = s->pb;

  860. 

  861.     mxf->footer_partition_offset = url_ftell(pb);

  862.     mxf_write_partition(s, 0, footer_partition_key, 0);

  863.     if (!url_is_streamed(s->pb)) {

  864.         url_fseek(pb, 0, SEEK_SET);

  865.         mxf_write_partition(s, 1, header_closed_partition_key, 1);

  866.     }

  867.     mxf_free(s);

  868.     return 0;

  869. }

  870. 

  871. AVOutputFormat mxf_muxer = {

  872.     "mxf",

  873.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  874.     NULL,

  875.     "mxf",

  876.     sizeof(MXFContext),

  877.     CODEC_ID_PCM_S16LE,

  878.     CODEC_ID_MPEG2VIDEO,

  879.     mxf_write_header,

  880.     mxf_write_packet,

  881.     mxf_write_footer,

  882. };

  883.