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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.  * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /*

  24.  * References

  25.  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value

  26.  * SMPTE 377M MXF File Format Specifications

  27.  * SMPTE 379M MXF Generic Container

  28.  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container

  29.  * SMPTE RP210: SMPTE Metadata Dictionary

  30.  * SMPTE RP224: Registry of SMPTE Universal Labels

  31.  */

  32. 

  33. //#define DEBUG

  34. 

  35. #include "libavutil/fifo.h"

  36. #include "mxf.h"

  37. 

  38. static const int NTSC_samples_per_frame[] = { 1602, 1601, 1602, 1601, 1602, 0 };

  39. static const int PAL_samples_per_frame[]  = { 1920, 0 };

  40. 

  41. typedef struct {

  42.     AVFifoBuffer fifo;

  43.     unsigned fifo_size;           ///< current fifo size allocated

  44.     uint64_t dts;                 ///< current dts

  45.     int sample_size;              ///< size of one sample all channels included

  46.     const int *samples_per_frame; ///< must be 0 terminated

  47.     const int *samples;           ///< current samples per frame, pointer to samples_per_frame

  48. } AudioInterleaveContext;

  49. 

  50. typedef struct {

  51.     int local_tag;

  52.     UID uid;

  53. } MXFLocalTagPair;

  54. 

  55. typedef struct {

  56.     AudioInterleaveContext aic;

  57.     UID track_essence_element_key;

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

  59.     const UID *codec_ul;

  60.     int64_t duration;

  61.     int order;            ///< interleaving order if dts are equal

  62.     int interlaced;       ///< wether picture is interlaced

  63. } MXFStreamContext;

  64. 

  65. typedef struct {

  66.     UID container_ul;

  67.     UID element_ul;

  68.     UID codec_ul;

  69.     enum CodecID id;

  70.     void (*write_desc)();

  71. } MXFContainerEssenceEntry;

  72. 

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

  74. static void mxf_write_aes3_desc(AVFormatContext *s, AVStream *st);

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

  76. 

  77. static const MXFContainerEssenceEntry mxf_essence_container_uls[] = {

  78.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 },

  79.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

  80.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x00,0x00,0x00 },

  81.       CODEC_ID_MPEG2VIDEO, mxf_write_mpegvideo_desc },

  82.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },

  83.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x03,0x00 },

  84.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },

  85.       CODEC_ID_PCM_S16LE, mxf_write_aes3_desc },

  86.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },

  87.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x01,0x00 },

  88.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },

  89.       CODEC_ID_PCM_S16LE, mxf_write_wav_desc },

  90.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  91.       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  92.       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  93.       CODEC_ID_NONE, NULL },

  94. };

  95. 

  96. typedef struct MXFContext {

  97.     int64_t footer_partition_offset;

  98.     int essence_container_count;

  99.     uint8_t essence_containers_indices[FF_ARRAY_ELEMS(mxf_essence_container_uls)];

  100.     AVRational time_base;

  101.     int header_written;

  102. } MXFContext;

  103. 

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

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

  106. 

  107. /**

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

  109.  */

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

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

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

  113. 

  114. 

  115. 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

  116. 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

  117. 

  118. /**

  119.  * partial key for header metadata

  120.  */

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

  122. 

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

  124. 

  125. /**

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

  127.  */

  128. static const MXFLocalTagPair mxf_local_tag_batch[] = {

  129.     // preface set

  130.     { 0x3C0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x02,0x00,0x00,0x00,0x00}}, /* Instance UID */

  131.     { 0x3B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x04,0x00,0x00}}, /* Last Modified Date */

  132.     { 0x3B05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x03,0x01,0x02,0x01,0x05,0x00,0x00,0x00}}, /* Version */

  133.     { 0x3B06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x04,0x00,0x00}}, /* Identifications reference */

  134.     { 0x3B03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x01,0x00,0x00}}, /* Content Storage reference */

  135.     { 0x3B09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x03,0x00,0x00,0x00,0x00}}, /* Operational Pattern UL */

  136.     { 0x3B0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x01,0x00,0x00}}, /* Essence Containers UL batch */

  137.     { 0x3B0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x02,0x00,0x00}}, /* DM Schemes UL batch */

  138.     // Identification

  139.     { 0x3C09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x01,0x00,0x00,0x00}}, /* This Generation UID */

  140.     { 0x3C01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x02,0x01,0x00,0x00}}, /* Company Name */

  141.     { 0x3C02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x03,0x01,0x00,0x00}}, /* Product Name */

  142.     { 0x3C04, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x05,0x01,0x00,0x00}}, /* Version String */

  143.     { 0x3C05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x07,0x00,0x00,0x00}}, /* Product ID */

  144.     { 0x3C06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x03,0x00,0x00}}, /* Modification Date */

  145.     // Content Storage

  146.     { 0x1901, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x01,0x00,0x00}}, /* Package strong reference batch */

  147.     { 0x1902, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x02,0x00,0x00}}, /* Package strong reference batch */

  148.     // Essence Container Data

  149.     { 0x2701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x06,0x01,0x00,0x00,0x00}}, /* Linked Package UID */

  150.     { 0x3F07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x04,0x00,0x00,0x00,0x00}}, /* BodySID */

  151.     // Package

  152.     { 0x4401, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x10,0x00,0x00,0x00,0x00}}, /* Package UID */

  153.     { 0x4405, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x01,0x03,0x00,0x00}}, /* Package Creation Date */

  154.     { 0x4404, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x05,0x00,0x00}}, /* Package Modified Date */

  155.     { 0x4403, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x05,0x00,0x00}}, /* Tracks Strong reference array */

  156.     { 0x4701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x03,0x00,0x00}}, /* Descriptor */

  157.     // Track

  158.     { 0x4801, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x07,0x01,0x01,0x00,0x00,0x00,0x00}}, /* Track ID */

  159.     { 0x4804, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x04,0x01,0x03,0x00,0x00,0x00,0x00}}, /* Track Number */

  160.     { 0x4B01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x30,0x04,0x05,0x00,0x00,0x00,0x00}}, /* Edit Rate */

  161.     { 0x4B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x03,0x00,0x00}}, /* Origin */

  162.     { 0x4803, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x04,0x00,0x00}}, /* Sequence reference */

  163.     // Sequence

  164.     { 0x0201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x07,0x01,0x00,0x00,0x00,0x00,0x00}}, /* Data Definition UL */

  165.     { 0x0202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x02,0x01,0x01,0x03,0x00,0x00}}, /* Duration */

  166.     { 0x1001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x09,0x00,0x00}}, /* Structural Components reference array */

  167.     // Source Clip

  168.     { 0x1201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x01,0x03,0x01,0x04,0x00,0x00}}, /* Start position */

  169.     { 0x1101, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x01,0x00,0x00,0x00}}, /* SourcePackageID */

  170.     { 0x1102, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x02,0x00,0x00,0x00}}, /* SourceTrackID */

  171.     // File Descriptor

  172.     { 0x3F01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x04,0x06,0x0B,0x00,0x00}}, /* Sub Descriptors reference array */

  173.     { 0x3006, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x06,0x01,0x01,0x03,0x05,0x00,0x00,0x00}}, /* Linked Track ID */

  174.     { 0x3001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x00,0x00,0x00,0x00}}, /* SampleRate */

  175.     { 0x3004, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x01,0x02,0x00,0x00}}, /* Essence Container */

  176.     // Generic Picture Essence Descriptor

  177.     { 0x320C, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Frame Layout */

  178.     { 0x320D, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x03,0x02,0x05,0x00,0x00,0x00}}, /* Video Line Map */

  179.     { 0x3203, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x02,0x00,0x00,0x00}}, /* Stored Width */

  180.     { 0x3202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x01,0x00,0x00,0x00}}, /* Stored Height */

  181.     { 0x320E, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x01,0x01,0x01,0x00,0x00,0x00}}, /* Aspect Ratio */

  182.     { 0x3201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x06,0x01,0x00,0x00,0x00,0x00}}, /* Picture Essence Coding */

  183.     // Generic Sound Essence Descriptor

  184.     { 0x3D02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Locked/Unlocked */

  185.     { 0x3D03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x01,0x01,0x00,0x00}}, /* Audio sampling rate */

  186.     { 0x3D07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x01,0x01,0x04,0x00,0x00,0x00}}, /* ChannelCount */

  187.     { 0x3D01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x03,0x04,0x00,0x00,0x00}}, /* Quantization bits */

  188.     { 0x3D06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x02,0x04,0x02,0x00,0x00,0x00,0x00}}, /* Sound Essence Compression */

  189. };

  190. 

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

  192. {

  193.     put_buffer(pb, uuid_base, 12);

  194.     put_be16(pb, type);

  195.     put_be16(pb, value);

  196. }

  197. 

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

  199. {

  200.     put_buffer(pb, umid_base, 16);

  201.     mxf_write_uuid(pb, type, value);

  202. }

  203. 

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

  205. {

  206.     put_be32(pb, ref_count);

  207.     put_be32(pb, 16);

  208. }

  209. 

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

  211. {

  212.     // Determine the best BER size

  213.     int size;

  214.     if (len < 128) {

  215.         //short form

  216.         put_byte(pb, len);

  217.         return 1;

  218.     }

  219. 

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

  221. 

  222.     // long form

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

  224.     while(size) {

  225.         size --;

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

  227.     }

  228.     return 0;

  229. }

  230. 

  231. /*

  232.  * Get essence container ul index

  233.  */

  234. static int mxf_get_essence_container_ul_index(enum CodecID id)

  235. {

  236.     int i;

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

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

  239.             return i;

  240.     return -1;

  241. }

  242. 

  243. static void mxf_write_primer_pack(AVFormatContext *s)

  244. {

  245.     ByteIOContext *pb = s->pb;

  246.     int local_tag_number, i = 0;

  247. 

  248.     local_tag_number = FF_ARRAY_ELEMS(mxf_local_tag_batch);

  249. 

  250.     put_buffer(pb, primer_pack_key, 16);

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

  252. 

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

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

  255. 

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

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

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

  259.     }

  260. }

  261. 

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

  263. {

  264.     put_be16(pb, tag);

  265.     put_be16(pb, size);

  266. }

  267. 

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

  269. {

  270.     put_buffer(pb, header_metadata_key, 13);

  271.     put_be24(pb, value);

  272. }

  273. 

  274. static void mxf_free(AVFormatContext *s)

  275. {

  276.     int i;

  277. 

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

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

  280.         av_freep(&st->priv_data);

  281.     }

  282. }

  283. 

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

  285. {

  286.     const MXFDataDefinitionUL *uls = ff_mxf_data_definition_uls;

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

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

  289.             break;

  290.         uls++;

  291.     }

  292.     return uls;

  293. }

  294. 

  295. static void mxf_write_essence_container_refs(AVFormatContext *s)

  296. {

  297.     MXFContext *c = s->priv_data;

  298.     ByteIOContext *pb = s->pb;

  299.     int i;

  300. 

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

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

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

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

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

  306.     }

  307. }

  308. 

  309. static void mxf_write_preface(AVFormatContext *s)

  310. {

  311.     MXFContext *mxf = s->priv_data;

  312.     ByteIOContext *pb = s->pb;

  313. 

  314.     mxf_write_metadata_key(pb, 0x012f00);

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

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

  317. 

  318.     // write preface set uid

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

  320.     mxf_write_uuid(pb, Preface, 0);

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

  322. 

  323.     // write create date as unknown

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

  325.     put_be64(pb, 0);

  326. 

  327.     // write version

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

  329.     put_be16(pb, 1);

  330. 

  331.     // write identification_refs

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

  333.     mxf_write_refs_count(pb, 1);

  334.     mxf_write_uuid(pb, Identification, 0);

  335. 

  336.     // write content_storage_refs

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

  338.     mxf_write_uuid(pb, ContentStorage, 0);

  339. 

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

  341.     put_buffer(pb, op1a_ul, 16);

  342. 

  343.     // write essence_container_refs

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

  345.     mxf_write_essence_container_refs(s);

  346. 

  347.     // write dm_scheme_refs

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

  349.     put_be64(pb, 0);

  350. }

  351. 

  352. /*

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

  354.  */

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

  356. {

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

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

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

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

  361. }

  362. 

  363. static void mxf_write_identification(AVFormatContext *s)

  364. {

  365.     ByteIOContext *pb = s->pb;

  366.     const char *company = "FFmpeg";

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

  368.     const char *version;

  369.     int length;

  370. 

  371.     mxf_write_metadata_key(pb, 0x013000);

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

  373. 

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

  375.         "0.0.0" : AV_STRINGIFY(LIBAVFORMAT_VERSION);

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

  377.     klv_encode_ber_length(pb, length);

  378. 

  379.     // write uid

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

  381.     mxf_write_uuid(pb, Identification, 0);

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

  383. 

  384.     // write generation uid

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

  386.     mxf_write_uuid(pb, Identification, 1);

  387. 

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

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

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

  391. 

  392.     // write product uid

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

  394.     mxf_write_uuid(pb, Identification, 2);

  395. 

  396.     // write modified date

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

  398.     put_be64(pb, 0);

  399. }

  400. 

  401. static void mxf_write_content_storage(AVFormatContext *s)

  402. {

  403.     ByteIOContext *pb = s->pb;

  404. 

  405.     mxf_write_metadata_key(pb, 0x011800);

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

  407.     klv_encode_ber_length(pb, 92);

  408. 

  409.     // write uid

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

  411.     mxf_write_uuid(pb, ContentStorage, 0);

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

  413. 

  414.     // write package reference

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

  416.     mxf_write_refs_count(pb, 2);

  417.     mxf_write_uuid(pb, MaterialPackage, 0);

  418.     mxf_write_uuid(pb, SourcePackage, 0);

  419. 

  420.     // write essence container data

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

  422.     mxf_write_refs_count(pb, 1);

  423.     mxf_write_uuid(pb, EssenceContainerData, 0);

  424. }

  425. 

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

  427. {

  428.     ByteIOContext *pb = s->pb;

  429.     MXFStreamContext *sc = st->priv_data;

  430. 

  431.     mxf_write_metadata_key(pb, 0x013b00);

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

  433.     klv_encode_ber_length(pb, 80);

  434. 

  435.     // write track uid

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

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

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

  439. 

  440.     // write track id

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

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

  443. 

  444.     // write track number

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

  446.     if (type == MaterialPackage)

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

  448.     else

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

  450. 

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

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

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

  454. 

  455.     // write origin

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

  457.     put_be64(pb, 0);

  458. 

  459.     // write sequence refs

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

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

  462. }

  463. 

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

  465. {

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

  467.     MXFStreamContext *sc = st->priv_data;

  468. 

  469.     // find data define uls

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

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

  472. 

  473.     // write duration

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

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

  476. }

  477. 

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

  479. {

  480.     ByteIOContext *pb = s->pb;

  481. 

  482.     mxf_write_metadata_key(pb, 0x010f00);

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

  484.     klv_encode_ber_length(pb, 80);

  485. 

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

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

  488. 

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

  490.     mxf_write_common_fields(pb, st);

  491. 

  492.     // write structural component

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

  494.     mxf_write_refs_count(pb, 1);

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

  496. }

  497. 

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

  499. {

  500.     ByteIOContext *pb = s->pb;

  501.     int i;

  502. 

  503.     mxf_write_metadata_key(pb, 0x011100);

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

  505.     klv_encode_ber_length(pb, 108);

  506. 

  507.     // write uid

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

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

  510. 

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

  512.     mxf_write_common_fields(pb, st);

  513. 

  514.     // write start_position

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

  516.     put_be64(pb, 0);

  517. 

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

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

  520.     if (type == SourcePackage) {

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

  522.             put_be64(pb, 0);

  523.     } else

  524.         mxf_write_umid(pb, SourcePackage, 0);

  525. 

  526.     // write source track id

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

  528.     if (type == SourcePackage)

  529.         put_be32(pb, 0);

  530.     else

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

  532. }

  533. 

  534. static void mxf_write_multi_descriptor(AVFormatContext *s)

  535. {

  536.     ByteIOContext *pb = s->pb;

  537.     int i;

  538. 

  539.     mxf_write_metadata_key(pb, 0x014400);

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

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

  542. 

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

  544.     mxf_write_uuid(pb, MultipleDescriptor, 0);

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

  546. 

  547.     // write sample rate

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

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

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

  551. 

  552.     // write essence container ul

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

  554.     put_buffer(pb, multiple_desc_ul, 16);

  555. 

  556.     // write sub descriptor refs

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

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

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

  560.         mxf_write_uuid(pb, SubDescriptor, i);

  561. }

  562. 

  563. static void mxf_write_generic_desc(ByteIOContext *pb, AVStream *st, const UID key, unsigned size)

  564. {

  565.     MXFStreamContext *sc = st->priv_data;

  566. 

  567.     put_buffer(pb, key, 16);

  568.     klv_encode_ber_length(pb, size);

  569. 

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

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

  572. 

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

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

  575. 

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

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

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

  579. 

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

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

  582. }

  583. 

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

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

  586. static const UID mxf_aes3_descriptor_key      = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 };

  587. 

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

  589. {

  590.     MXFStreamContext *sc = st->priv_data;

  591.     ByteIOContext *pb = s->pb;

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

  593.     AVRational dar;

  594.     int f1, f2;

  595. 

  596.     mxf_write_generic_desc(pb, st, mxf_mpegvideo_descriptor_key, 133);

  597. 

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

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

  600. 

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

  602.     put_be32(pb, stored_height>>sc->interlaced);

  603. 

  604.     // frame layout

  605.     mxf_write_local_tag(pb, 1, 0x320C);

  606.     put_byte(pb, sc->interlaced);

  607. 

  608.     // video line map

  609.     mxf_write_local_tag(pb, 16, 0x320D);

  610.     put_be32(pb, 2);

  611.     put_be32(pb, 4);

  612.     switch (st->codec->height) {

  613.     case  576: f1 = 23; f2 = 336; break;

  614.     case  608: f1 =  7; f2 = 320; break;

  615.     case  480: f1 = 20; f2 = 283; break;

  616.     case  512: f1 =  7; f2 = 270; break;

  617.     case  720: f1 = 26; f2 =   0; break; // progressive

  618.     case 1080: f1 = 21; f2 = 584; break;

  619.     default:   f1 =  0; f2 =   0; break;

  620.     }

  621. 

  622.     if (!sc->interlaced) {

  623.         f2  = 0;

  624.         f1 *= 2;

  625.     }

  626. 

  627.     put_be32(pb, f1);

  628.     put_be32(pb, f2);

  629. 

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

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

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

  633.               1024*1024);

  634. 

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

  636.     put_be32(pb, dar.num);

  637.     put_be32(pb, dar.den);

  638. 

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

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

  641. }

  642. 

  643. static void mxf_write_generic_sound_desc(AVFormatContext *s, AVStream *st, const UID key, unsigned size)

  644. {

  645.     ByteIOContext *pb = s->pb;

  646. 

  647.     mxf_write_generic_desc(pb, st, key, size);

  648. 

  649.     // audio locked

  650.     mxf_write_local_tag(pb, 1, 0x3D02);

  651.     put_byte(pb, 1);

  652. 

  653.     // write audio sampling rate

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

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

  656.     put_be32(pb, 1);

  657. 

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

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

  660. 

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

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

  663. }

  664. 

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

  666. {

  667.     mxf_write_generic_sound_desc(s, st, mxf_wav_descriptor_key, 93);

  668. }

  669. 

  670. static void mxf_write_aes3_desc(AVFormatContext *s, AVStream *st)

  671. {

  672.     mxf_write_generic_sound_desc(s, st, mxf_aes3_descriptor_key, 93);

  673. }

  674. 

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

  676. {

  677.     ByteIOContext *pb = s->pb;

  678.     int i;

  679. 

  680.     if (type == MaterialPackage) {

  681.         mxf_write_metadata_key(pb, 0x013600);

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

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

  684.     } else {

  685.         mxf_write_metadata_key(pb, 0x013700);

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

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

  688.     }

  689. 

  690.     // write uid

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

  692.     mxf_write_uuid(pb, type, 0);

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

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

  695. 

  696.     // write package umid

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

  698.     mxf_write_umid(pb, type, 0);

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

  700. 

  701.     // write create date

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

  703.     put_be64(pb, 0);

  704. 

  705.     // write modified date

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

  707.     put_be64(pb, 0);

  708. 

  709.     // write track refs

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

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

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

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

  714. 

  715.     // write multiple descriptor reference

  716.     if (type == SourcePackage) {

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

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

  719.             mxf_write_uuid(pb, MultipleDescriptor, 0);

  720.             mxf_write_multi_descriptor(s);

  721.         } else

  722.             mxf_write_uuid(pb, SubDescriptor, 0);

  723.     }

  724. 

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

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

  727.         mxf_write_track(s, st, type);

  728.         mxf_write_sequence(s, st, type);

  729.         mxf_write_structural_component(s, st, type);

  730. 

  731.         if (type == SourcePackage) {

  732.             MXFStreamContext *sc = st->priv_data;

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

  734.         }

  735.     }

  736. }

  737. 

  738. static int mxf_write_essence_container_data(AVFormatContext *s)

  739. {

  740.     ByteIOContext *pb = s->pb;

  741. 

  742.     mxf_write_metadata_key(pb, 0x012300);

  743.     klv_encode_ber_length(pb, 64);

  744. 

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

  746.     mxf_write_uuid(pb, EssenceContainerData, 0);

  747. 

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

  749.     mxf_write_umid(pb, SourcePackage, 0);

  750. 

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

  752.     put_be32(pb, 1);

  753. 

  754.     return 0;

  755. }

  756. 

  757. static int mxf_write_header_metadata_sets(AVFormatContext *s)

  758. {

  759.     mxf_write_preface(s);

  760.     mxf_write_identification(s);

  761.     mxf_write_content_storage(s);

  762.     mxf_write_package(s, MaterialPackage);

  763.     mxf_write_package(s, SourcePackage);

  764.     mxf_write_essence_container_data(s);

  765.     return 0;

  766. }

  767. 

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

  769. {

  770.     MXFContext *mxf = s->priv_data;

  771.     ByteIOContext *pb = s->pb;

  772.     int64_t header_byte_count_offset;

  773. 

  774.     // write klv

  775.     put_buffer(pb, key, 16);

  776. 

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

  778. 

  779.     // write partition value

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

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

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

  783. 

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

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

  786. 

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

  788. 

  789.     // set offset

  790.     header_byte_count_offset = url_ftell(pb);

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

  792. 

  793.     // no indexTable

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

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

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

  797. 

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

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

  800. 

  801.     // essence container

  802.     mxf_write_essence_container_refs(s);

  803. 

  804.     if (write_metadata) {

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

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

  807.         mxf_write_primer_pack(s);

  808.         mxf_write_header_metadata_sets(s);

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

  810.         // update header_byte_count

  811.         url_fseek(pb, header_byte_count_offset, SEEK_SET);

  812.         put_be64(pb, pos - start);

  813.         url_fseek(pb, pos, SEEK_SET);

  814.     }

  815. 

  816.     put_flush_packet(pb);

  817. }

  818. 

  819. static const UID mxf_mpeg2_codec_uls[] = {

  820.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x10,0x00 }, // MP-ML I-Frame

  821.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, // MP-ML Long GOP

  822.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, // 422P-ML I-Frame

  823.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, // 422P-ML Long GOP

  824.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x02,0x00 }, // MP-HL I-Frame

  825.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, // MP-HL Long GOP

  826.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, // 422P-HL I-Frame

  827.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, // 422P-HL Long GOP

  828. };

  829. 

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

  831. {

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

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

  834.             return avctx->gop_size ?

  835.                 &mxf_mpeg2_codec_uls[1] :

  836.                 &mxf_mpeg2_codec_uls[0];

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

  838.             return avctx->gop_size ?

  839.                 &mxf_mpeg2_codec_uls[5] :

  840.                 &mxf_mpeg2_codec_uls[4];

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

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

  843.             return avctx->gop_size ?

  844.                 &mxf_mpeg2_codec_uls[3] :

  845.                 &mxf_mpeg2_codec_uls[2];

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

  847.             return avctx->gop_size ?

  848.                 &mxf_mpeg2_codec_uls[7] :

  849.                 &mxf_mpeg2_codec_uls[6];

  850.     }

  851.     return NULL;

  852. }

  853. 

  854. static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st, AVPacket *pkt)

  855. {

  856.     MXFStreamContext *sc = st->priv_data;

  857.     uint32_t c = -1;

  858.     int i;

  859. 

  860.     for(i = 0; i < pkt->size - 4; i++) {

  861.         c = (c<<8) + pkt->data[i];

  862.         if (c == 0x1B5) {

  863.             if (i + 2 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x10) { // seq ext

  864.                 st->codec->profile = pkt->data[i+1] & 0x07;

  865.                 st->codec->level   = pkt->data[i+2] >> 4;

  866.             } else if (i + 5 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x80) { // pict coding ext

  867.                 sc->interlaced = !(pkt->data[i+5] & 0x80); // progressive frame

  868.                 break;

  869.             }

  870.         }

  871.     }

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

  873.     return !!sc->codec_ul;

  874. }

  875. 

  876. static int ff_audio_interleave_init(AVFormatContext *s, const int *samples_per_frame)

  877. {

  878.     int i;

  879. 

  880.     if (!samples_per_frame)

  881.         return -1;

  882. 

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

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

  885.         AudioInterleaveContext *aic = st->priv_data;

  886. 

  887.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  888.             aic->sample_size = (st->codec->channels *

  889.                                 av_get_bits_per_sample(st->codec->codec_id)) / 8;

  890.             if (!aic->sample_size) {

  891.                 av_log(s, AV_LOG_ERROR, "could not compute sample size\n");

  892.                 return -1;

  893.             }

  894.             aic->samples_per_frame = samples_per_frame;

  895.             aic->samples = aic->samples_per_frame;

  896. 

  897.             av_fifo_init(&aic->fifo, 100 * *aic->samples);

  898.         }

  899.     }

  900. 

  901.     return 0;

  902. }

  903. 

  904. static void ff_audio_interleave_close(AVFormatContext *s)

  905. {

  906.     int i;

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

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

  909.         AudioInterleaveContext *aic = st->priv_data;

  910. 

  911.         if (st->codec->codec_type == CODEC_TYPE_AUDIO)

  912.             av_fifo_free(&aic->fifo);

  913.     }

  914. }

  915. 

  916. static int mxf_write_header(AVFormatContext *s)

  917. {

  918.     MXFContext *mxf = s->priv_data;

  919.     int i;

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

  921.     const int *samples_per_frame = NULL;

  922. 

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

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

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

  926.         if (!sc)

  927.             return AVERROR(ENOMEM);

  928.         st->priv_data = sc;

  929. 

  930.         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

  931.             if (!av_cmp_q(st->codec->time_base, (AVRational){ 1, 25 })) {

  932.                 samples_per_frame = PAL_samples_per_frame;

  933.                 mxf->time_base = (AVRational){ 1, 25 };

  934.             } else if (!av_cmp_q(st->codec->time_base, (AVRational){ 1001, 30000 })) {

  935.                 samples_per_frame = NTSC_samples_per_frame;

  936.                 mxf->time_base = (AVRational){ 1001, 30000 };

  937.             } else {

  938.                 av_log(s, AV_LOG_ERROR, "unsupported video frame rate\n");

  939.                 return -1;

  940.             }

  941.         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  942.             if (st->codec->sample_rate != 48000) {

  943.                 av_log(s, AV_LOG_ERROR, "only 48khz is implemented\n");

  944.                 return -1;

  945.             }

  946.         }

  947.         sc->duration = -1;

  948. 

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

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

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

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

  953.             return -1;

  954.         }

  955. 

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

  957. 

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

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

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

  961.         } else

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

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

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

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

  966.     }

  967. 

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

  969.         MXFStreamContext *sc = s->streams[i]->priv_data;

  970.         av_set_pts_info(s->streams[i], 64, mxf->time_base.num, mxf->time_base.den);

  971.         // update element count

  972.         sc->track_essence_element_key[13] = present[sc->index];

  973.         sc->order = AV_RB32(sc->track_essence_element_key+12);

  974.     }

  975. 

  976.     if (!samples_per_frame)

  977.         samples_per_frame = PAL_samples_per_frame;

  978. 

  979.     if (ff_audio_interleave_init(s, samples_per_frame) < 0)

  980.         return -1;

  981. 

  982.     return 0;

  983. }

  984. 

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

  986. {

  987.     MXFContext *mxf = s->priv_data;

  988.     ByteIOContext *pb = s->pb;

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

  990.     MXFStreamContext *sc = st->priv_data;

  991. 

  992.     if (!mxf->header_written) {

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

  994.             if (!mxf_parse_mpeg2_frame(s, st, pkt)) {

  995.                 av_log(s, AV_LOG_ERROR, "could not get mpeg2 profile and level\n");

  996.                 return -1;

  997.             }

  998.         }

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

  1000.         mxf->header_written = 1;

  1001.     }

  1002. 

  1003.     put_buffer(pb, sc->track_essence_element_key, 16); // write key

  1004.     klv_encode_ber_length(pb, pkt->size); // write length

  1005.     put_buffer(pb, pkt->data, pkt->size); // write value

  1006. 

  1007.     sc->duration = FFMAX(pkt->pts + pkt->duration, sc->duration);

  1008. 

  1009.     put_flush_packet(pb);

  1010.     return 0;

  1011. }

  1012. 

  1013. static int mxf_write_footer(AVFormatContext *s)

  1014. {

  1015.     MXFContext *mxf = s->priv_data;

  1016.     ByteIOContext *pb = s->pb;

  1017. 

  1018.     mxf->footer_partition_offset = url_ftell(pb);

  1019.     mxf_write_partition(s, 0, footer_partition_key, 0);

  1020.     if (!url_is_streamed(s->pb)) {

  1021.         url_fseek(pb, 0, SEEK_SET);

  1022.         mxf_write_partition(s, 1, header_closed_partition_key, 1);

  1023.     }

  1024. 

  1025.     ff_audio_interleave_close(s);

  1026. 

  1027.     mxf_free(s);

  1028.     return 0;

  1029. }

  1030. 

  1031. static int mxf_interleave_new_audio_packet(AVFormatContext *s, AVPacket *pkt,

  1032.                                            int stream_index, int flush)

  1033. {

  1034.     AVStream *st = s->streams[stream_index];

  1035.     AudioInterleaveContext *aic = st->priv_data;

  1036. 

  1037.     int size = FFMIN(av_fifo_size(&aic->fifo), *aic->samples * aic->sample_size);

  1038.     if (!size || (!flush && size == av_fifo_size(&aic->fifo)))

  1039.         return 0;

  1040. 

  1041.     av_new_packet(pkt, size);

  1042.     av_fifo_read(&aic->fifo, pkt->data, size);

  1043. 

  1044.     pkt->dts = pkt->pts = aic->dts;

  1045.     pkt->duration = av_rescale_q(*aic->samples,

  1046.                                  (AVRational){ 1, st->codec->sample_rate },

  1047.                                  st->time_base);

  1048.     pkt->stream_index = stream_index;

  1049.     aic->dts += pkt->duration;

  1050. 

  1051.     aic->samples++;

  1052.     if (!*aic->samples)

  1053.         aic->samples = aic->samples_per_frame;

  1054. 

  1055.     return size;

  1056. }

  1057. 

  1058. static int mxf_interleave_get_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

  1059. {

  1060.     AVPacketList *pktl;

  1061.     int stream_count = 0;

  1062.     int streams[MAX_STREAMS];

  1063. 

  1064.     memset(streams, 0, sizeof(streams));

  1065.     pktl = s->packet_buffer;

  1066.     while (pktl) {

  1067.         //av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);

  1068.         if (!streams[pktl->pkt.stream_index])

  1069.             stream_count++;

  1070.         streams[pktl->pkt.stream_index]++;

  1071.         pktl = pktl->next;

  1072.     }

  1073. 

  1074.     if (stream_count && (s->nb_streams == stream_count || flush)) {

  1075.         pktl = s->packet_buffer;

  1076.         *out = pktl->pkt;

  1077.         //av_log(s, AV_LOG_DEBUG, "out st:%d dts:%lld\n", (*out).stream_index, (*out).dts);

  1078.         s->packet_buffer = pktl->next;

  1079.         av_freep(&pktl);

  1080. 

  1081.         if (flush && stream_count < s->nb_streams) {

  1082.             // purge packet queue

  1083.             pktl = s->packet_buffer;

  1084.             while (pktl) {

  1085.                 AVPacketList *next = pktl->next;

  1086.                 av_free_packet(&pktl->pkt);

  1087.                 av_freep(&pktl);

  1088.                 pktl = next;

  1089.             }

  1090.             s->packet_buffer = NULL;

  1091.         }

  1092. 

  1093.         return 1;

  1094.     } else {

  1095.         av_init_packet(out);

  1096.         return 0;

  1097.     }

  1098. }

  1099. 

  1100. static int mxf_compare_timestamps(AVFormatContext *s, AVPacket *next, AVPacket *pkt)

  1101. {

  1102.     AVStream *st  = s->streams[pkt ->stream_index];

  1103.     AVStream *st2 = s->streams[next->stream_index];

  1104.     MXFStreamContext *sc  = st ->priv_data;

  1105.     MXFStreamContext *sc2 = st2->priv_data;

  1106. 

  1107.     int64_t left  = st2->time_base.num * (int64_t)st ->time_base.den;

  1108.     int64_t right = st ->time_base.num * (int64_t)st2->time_base.den;

  1109. 

  1110.     return next->dts * left > pkt->dts * right || // FIXME this can overflow

  1111.         (next->dts * left == pkt->dts * right && sc->order < sc2->order);

  1112. }

  1113. 

  1114. static int mxf_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

  1115. {

  1116.     int i;

  1117. 

  1118.     if (pkt) {

  1119.         AVStream *st = s->streams[pkt->stream_index];

  1120.         AudioInterleaveContext *aic = st->priv_data;

  1121.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1122.             av_fifo_generic_write(&aic->fifo, pkt->data, pkt->size, NULL);

  1123.         } else {

  1124.             // rewrite pts and dts to be decoded time line position

  1125.             pkt->pts = pkt->dts = aic->dts;

  1126.             aic->dts += pkt->duration;

  1127.             ff_interleave_add_packet(s, pkt, mxf_compare_timestamps);

  1128.         }

  1129.         pkt = NULL;

  1130.     }

  1131. 

  1132.     for (i = 0; i < s->nb_streams; i++) {

  1133.         AVStream *st = s->streams[i];

  1134.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1135.             AVPacket new_pkt;

  1136.             while (mxf_interleave_new_audio_packet(s, &new_pkt, i, flush))

  1137.                 ff_interleave_add_packet(s, &new_pkt, mxf_compare_timestamps);

  1138.         }

  1139.     }

  1140. 

  1141.     return mxf_interleave_get_packet(s, out, pkt, flush);

  1142. }

  1143. 

  1144. AVOutputFormat mxf_muxer = {

  1145.     "mxf",

  1146.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1147.     NULL,

  1148.     "mxf",

  1149.     sizeof(MXFContext),

  1150.     CODEC_ID_PCM_S16LE,

  1151.     CODEC_ID_MPEG2VIDEO,

  1152.     mxf_write_header,

  1153.     mxf_write_packet,

  1154.     mxf_write_footer,

  1155.     0,

  1156.     NULL,

  1157.     mxf_interleave,

  1158. };