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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 <math.h>

  36. #include <time.h>

  37. 

  38. #include "libavutil/fifo.h"

  39. #include "libavcodec/bytestream.h"

  40. #include "audiointerleave.h"

  41. #include "avformat.h"

  42. #include "mxf.h"

  43. 

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

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

  46. 

  47. #define MXF_INDEX_CLUSTER_SIZE 4096

  48. #define KAG_SIZE 512

  49. 

  50. typedef struct {

  51.     int local_tag;

  52.     UID uid;

  53. } MXFLocalTagPair;

  54. 

  55. typedef struct {

  56.     uint8_t flags;

  57.     uint64_t offset;

  58.     unsigned slice_offset; // offset of audio slice

  59. } MXFIndexEntry;

  60. 

  61. typedef struct {

  62.     AudioInterleaveContext aic;

  63.     UID track_essence_element_key;

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

  65.     const UID *codec_ul;

  66.     int64_t duration;

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

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

  69.     int temporal_reordering;

  70. } MXFStreamContext;

  71. 

  72. typedef struct {

  73.     UID container_ul;

  74.     UID element_ul;

  75.     UID codec_ul;

  76.     void (*write_desc)();

  77. } MXFContainerEssenceEntry;

  78. 

  79. static const struct {

  80.     enum CodecID id;

  81.     int index;

  82. } mxf_essence_mappings[] = {

  83.     { CODEC_ID_MPEG2VIDEO, 0 },

  84.     { CODEC_ID_PCM_S24LE,  1 },

  85.     { CODEC_ID_PCM_S16LE,  1 },

  86.     { 0 }

  87. };

  88. 

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

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

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

  92. 

  93. static const MXFContainerEssenceEntry mxf_essence_container_uls[] = {

  94.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 },

  95.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

  96.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x00,0x00,0x00 },

  97.       mxf_write_mpegvideo_desc },

  98.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },

  99.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x03,0x00 },

  100.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },

  101.       mxf_write_aes3_desc },

  102.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },

  103.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x01,0x00 },

  104.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },

  105.       mxf_write_wav_desc },

  106.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  107.       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  108.       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  109.       NULL },

  110. };

  111. 

  112. typedef struct MXFContext {

  113.     int64_t footer_partition_offset;

  114.     int essence_container_count;

  115.     uint8_t essence_containers_indices[FF_ARRAY_ELEMS(mxf_essence_container_uls)];

  116.     AVRational time_base;

  117.     int header_written;

  118.     MXFIndexEntry *index_entries;

  119.     unsigned edit_units_count;

  120.     uint64_t timestamp;   ///< timestamp, as year(16),month(8),day(8),hour(8),minutes(8),msec/4(8)

  121.     uint8_t slice_count;  /// index slice count minus 1 (1 if no audio, 0 otherwise)

  122. } MXFContext;

  123. 

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

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

  126. 

  127. /**

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

  129.  */

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

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

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

  133. static const uint8_t index_table_segment_key[]     = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 };

  134. static const uint8_t random_index_pack_key[]       = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x11,0x01,0x00 };

  135. 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

  136. 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

  137. static const uint8_t klv_fill_key[]                = { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x03,0x01,0x02,0x10,0x01,0x00,0x00,0x00 };

  138. 

  139. /**

  140.  * partial key for header metadata

  141.  */

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

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

  144. 

  145. /**

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

  147.  */

  148. static const MXFLocalTagPair mxf_local_tag_batch[] = {

  149.     // preface set

  150.     { 0x3C0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x02,0x00,0x00,0x00,0x00}}, /* Instance UID */

  151.     { 0x3B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x04,0x00,0x00}}, /* Last Modified Date */

  152.     { 0x3B05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x03,0x01,0x02,0x01,0x05,0x00,0x00,0x00}}, /* Version */

  153.     { 0x3B06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x04,0x00,0x00}}, /* Identifications reference */

  154.     { 0x3B03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x01,0x00,0x00}}, /* Content Storage reference */

  155.     { 0x3B09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x03,0x00,0x00,0x00,0x00}}, /* Operational Pattern UL */

  156.     { 0x3B0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x01,0x00,0x00}}, /* Essence Containers UL batch */

  157.     { 0x3B0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x02,0x00,0x00}}, /* DM Schemes UL batch */

  158.     // Identification

  159.     { 0x3C09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x01,0x00,0x00,0x00}}, /* This Generation UID */

  160.     { 0x3C01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x02,0x01,0x00,0x00}}, /* Company Name */

  161.     { 0x3C02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x03,0x01,0x00,0x00}}, /* Product Name */

  162.     { 0x3C04, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x05,0x01,0x00,0x00}}, /* Version String */

  163.     { 0x3C05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x07,0x00,0x00,0x00}}, /* Product ID */

  164.     { 0x3C06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x03,0x00,0x00}}, /* Modification Date */

  165.     // Content Storage

  166.     { 0x1901, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x01,0x00,0x00}}, /* Package strong reference batch */

  167.     { 0x1902, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x02,0x00,0x00}}, /* Package strong reference batch */

  168.     // Essence Container Data

  169.     { 0x2701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x06,0x01,0x00,0x00,0x00}}, /* Linked Package UID */

  170.     { 0x3F07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x04,0x00,0x00,0x00,0x00}}, /* BodySID */

  171.     // Package

  172.     { 0x4401, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x10,0x00,0x00,0x00,0x00}}, /* Package UID */

  173.     { 0x4405, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x01,0x03,0x00,0x00}}, /* Package Creation Date */

  174.     { 0x4404, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x05,0x00,0x00}}, /* Package Modified Date */

  175.     { 0x4403, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x05,0x00,0x00}}, /* Tracks Strong reference array */

  176.     { 0x4701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x03,0x00,0x00}}, /* Descriptor */

  177.     // Track

  178.     { 0x4801, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x07,0x01,0x01,0x00,0x00,0x00,0x00}}, /* Track ID */

  179.     { 0x4804, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x04,0x01,0x03,0x00,0x00,0x00,0x00}}, /* Track Number */

  180.     { 0x4B01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x30,0x04,0x05,0x00,0x00,0x00,0x00}}, /* Edit Rate */

  181.     { 0x4B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x03,0x00,0x00}}, /* Origin */

  182.     { 0x4803, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x04,0x00,0x00}}, /* Sequence reference */

  183.     // Sequence

  184.     { 0x0201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x07,0x01,0x00,0x00,0x00,0x00,0x00}}, /* Data Definition UL */

  185.     { 0x0202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x02,0x01,0x01,0x03,0x00,0x00}}, /* Duration */

  186.     { 0x1001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x09,0x00,0x00}}, /* Structural Components reference array */

  187.     // Source Clip

  188.     { 0x1201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x01,0x03,0x01,0x04,0x00,0x00}}, /* Start position */

  189.     { 0x1101, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x01,0x00,0x00,0x00}}, /* SourcePackageID */

  190.     { 0x1102, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x02,0x00,0x00,0x00}}, /* SourceTrackID */

  191.     // File Descriptor

  192.     { 0x3F01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x04,0x06,0x0B,0x00,0x00}}, /* Sub Descriptors reference array */

  193.     { 0x3006, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x06,0x01,0x01,0x03,0x05,0x00,0x00,0x00}}, /* Linked Track ID */

  194.     { 0x3001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x00,0x00,0x00,0x00}}, /* SampleRate */

  195.     { 0x3004, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x01,0x02,0x00,0x00}}, /* Essence Container */

  196.     // Generic Picture Essence Descriptor

  197.     { 0x320C, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Frame Layout */

  198.     { 0x320D, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x03,0x02,0x05,0x00,0x00,0x00}}, /* Video Line Map */

  199.     { 0x3203, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x02,0x00,0x00,0x00}}, /* Stored Width */

  200.     { 0x3202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x01,0x00,0x00,0x00}}, /* Stored Height */

  201.     { 0x3209, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0C,0x00,0x00,0x00}}, /* Display Width */

  202.     { 0x3208, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0B,0x00,0x00,0x00}}, /* Display Height */

  203.     { 0x320E, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x01,0x01,0x01,0x00,0x00,0x00}}, /* Aspect Ratio */

  204.     { 0x3201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x06,0x01,0x00,0x00,0x00,0x00}}, /* Picture Essence Coding */

  205.     // Generic Sound Essence Descriptor

  206.     { 0x3D02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Locked/Unlocked */

  207.     { 0x3D03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x01,0x01,0x00,0x00}}, /* Audio sampling rate */

  208.     { 0x3D07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x01,0x01,0x04,0x00,0x00,0x00}}, /* ChannelCount */

  209.     { 0x3D01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x03,0x04,0x00,0x00,0x00}}, /* Quantization bits */

  210.     { 0x3D06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x02,0x04,0x02,0x00,0x00,0x00,0x00}}, /* Sound Essence Compression */

  211.     // Index Table Segment

  212.     { 0x3F0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x05,0x30,0x04,0x06,0x00,0x00,0x00,0x00}}, /* Index Edit Rate */

  213.     { 0x3F0C, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x01,0x03,0x01,0x0A,0x00,0x00}}, /* Index Start Position */

  214.     { 0x3F0D, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x02,0x01,0x01,0x02,0x00,0x00}}, /* Index Duration */

  215.     { 0x3F05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x06,0x02,0x01,0x00,0x00,0x00,0x00,0x00}}, /* Edit Unit Byte Count */

  216.     { 0x3F06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x05,0x00,0x00,0x00,0x00}}, /* IndexSID */

  217.     { 0x3F08, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x04,0x04,0x01,0x01,0x00,0x00,0x00}}, /* Slice Count */

  218.     { 0x3F09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x04,0x04,0x01,0x06,0x00,0x00,0x00}}, /* Delta Entry Array */

  219.     { 0x3F0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x04,0x04,0x02,0x05,0x00,0x00,0x00}}, /* Index Entry Array */

  220.     // MPEG video Descriptor

  221.     { 0x8000, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x01,0x06,0x02,0x01,0x0B,0x00,0x00}}, /* BitRate */

  222.     // Wave Audio Essence Descriptor

  223.     { 0x3D09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x03,0x05,0x00,0x00,0x00}}, /* Average Bytes Per Second */

  224.     { 0x3D0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x02,0x01,0x00,0x00,0x00}}, /* Block Align */

  225. };

  226. 

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

  228. {

  229.     put_buffer(pb, uuid_base, 12);

  230.     put_be16(pb, type);

  231.     put_be16(pb, value);

  232. }

  233. 

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

  235. {

  236.     put_buffer(pb, umid_base, 16);

  237.     mxf_write_uuid(pb, type, value);

  238. }

  239. 

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

  241. {

  242.     put_be32(pb, ref_count);

  243.     put_be32(pb, 16);

  244. }

  245. 

  246. static int klv_ber_length(uint64_t len)

  247. {

  248.     if (len < 128)

  249.         return 1;

  250.     else

  251.         return (av_log2(len) >> 3) + 2;

  252. }

  253. 

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

  255. {

  256.     // Determine the best BER size

  257.     int size;

  258.     if (len < 128) {

  259.         //short form

  260.         put_byte(pb, len);

  261.         return 1;

  262.     }

  263. 

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

  265. 

  266.     // long form

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

  268.     while(size) {

  269.         size--;

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

  271.     }

  272.     return 0;

  273. }

  274. 

  275. /*

  276.  * Get essence container ul index

  277.  */

  278. static int mxf_get_essence_container_ul_index(enum CodecID id)

  279. {

  280.     int i;

  281.     for (i = 0; mxf_essence_mappings[i].id; i++)

  282.         if (mxf_essence_mappings[i].id == id)

  283.             return mxf_essence_mappings[i].index;

  284.     return -1;

  285. }

  286. 

  287. static void mxf_write_primer_pack(AVFormatContext *s)

  288. {

  289.     ByteIOContext *pb = s->pb;

  290.     int local_tag_number, i = 0;

  291. 

  292.     local_tag_number = FF_ARRAY_ELEMS(mxf_local_tag_batch);

  293. 

  294.     put_buffer(pb, primer_pack_key, 16);

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

  296. 

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

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

  299. 

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

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

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

  303.     }

  304. }

  305. 

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

  307. {

  308.     put_be16(pb, tag);

  309.     put_be16(pb, size);

  310. }

  311. 

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

  313. {

  314.     put_buffer(pb, header_metadata_key, 13);

  315.     put_be24(pb, value);

  316. }

  317. 

  318. static void mxf_free(AVFormatContext *s)

  319. {

  320.     int i;

  321. 

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

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

  324.         av_freep(&st->priv_data);

  325.     }

  326. }

  327. 

  328. static const MXFCodecUL *mxf_get_data_definition_ul(int type)

  329. {

  330.     const MXFCodecUL *uls = ff_mxf_data_definition_uls;

  331.     while (uls->uid[0]) {

  332.         if (type == uls->id)

  333.             break;

  334.         uls++;

  335.     }

  336.     return uls;

  337. }

  338. 

  339. static void mxf_write_essence_container_refs(AVFormatContext *s)

  340. {

  341.     MXFContext *c = s->priv_data;

  342.     ByteIOContext *pb = s->pb;

  343.     int i;

  344. 

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

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

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

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

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

  350.     }

  351. }

  352. 

  353. static void mxf_write_preface(AVFormatContext *s)

  354. {

  355.     MXFContext *mxf = s->priv_data;

  356.     ByteIOContext *pb = s->pb;

  357. 

  358.     mxf_write_metadata_key(pb, 0x012f00);

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

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

  361. 

  362.     // write preface set uid

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

  364.     mxf_write_uuid(pb, Preface, 0);

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

  366. 

  367.     // last modified date

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

  369.     put_be64(pb, mxf->timestamp);

  370. 

  371.     // write version

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

  373.     put_be16(pb, 1);

  374. 

  375.     // write identification_refs

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

  377.     mxf_write_refs_count(pb, 1);

  378.     mxf_write_uuid(pb, Identification, 0);

  379. 

  380.     // write content_storage_refs

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

  382.     mxf_write_uuid(pb, ContentStorage, 0);

  383. 

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

  385.     put_buffer(pb, op1a_ul, 16);

  386. 

  387.     // write essence_container_refs

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

  389.     mxf_write_essence_container_refs(s);

  390. 

  391.     // write dm_scheme_refs

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

  393.     put_be64(pb, 0);

  394. }

  395. 

  396. /*

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

  398.  */

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

  400. {

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

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

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

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

  405. }

  406. 

  407. static void mxf_write_identification(AVFormatContext *s)

  408. {

  409.     MXFContext *mxf = s->priv_data;

  410.     ByteIOContext *pb = s->pb;

  411.     const char *company = "FFmpeg";

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

  413.     const char *version;

  414.     int length;

  415. 

  416.     mxf_write_metadata_key(pb, 0x013000);

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

  418. 

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

  420.         "0.0.0" : AV_STRINGIFY(LIBAVFORMAT_VERSION);

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

  422.     klv_encode_ber_length(pb, length);

  423. 

  424.     // write uid

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

  426.     mxf_write_uuid(pb, Identification, 0);

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

  428. 

  429.     // write generation uid

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

  431.     mxf_write_uuid(pb, Identification, 1);

  432. 

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

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

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

  436. 

  437.     // write product uid

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

  439.     mxf_write_uuid(pb, Identification, 2);

  440. 

  441.     // modification date

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

  443.     put_be64(pb, mxf->timestamp);

  444. }

  445. 

  446. static void mxf_write_content_storage(AVFormatContext *s)

  447. {

  448.     ByteIOContext *pb = s->pb;

  449. 

  450.     mxf_write_metadata_key(pb, 0x011800);

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

  452.     klv_encode_ber_length(pb, 92);

  453. 

  454.     // write uid

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

  456.     mxf_write_uuid(pb, ContentStorage, 0);

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

  458. 

  459.     // write package reference

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

  461.     mxf_write_refs_count(pb, 2);

  462.     mxf_write_uuid(pb, MaterialPackage, 0);

  463.     mxf_write_uuid(pb, SourcePackage, 0);

  464. 

  465.     // write essence container data

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

  467.     mxf_write_refs_count(pb, 1);

  468.     mxf_write_uuid(pb, EssenceContainerData, 0);

  469. }

  470. 

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

  472. {

  473.     MXFContext *mxf = s->priv_data;

  474.     ByteIOContext *pb = s->pb;

  475.     MXFStreamContext *sc = st->priv_data;

  476. 

  477.     mxf_write_metadata_key(pb, 0x013b00);

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

  479.     klv_encode_ber_length(pb, 80);

  480. 

  481.     // write track uid

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

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

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

  485. 

  486.     // write track id

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

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

  489. 

  490.     // write track number

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

  492.     if (type == MaterialPackage)

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

  494.     else

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

  496. 

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

  498.     put_be32(pb, mxf->time_base.den);

  499.     put_be32(pb, mxf->time_base.num);

  500. 

  501.     // write origin

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

  503.     put_be64(pb, 0);

  504. 

  505.     // write sequence refs

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

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

  508. }

  509. 

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

  511. {

  512.     const MXFCodecUL *data_def_ul = mxf_get_data_definition_ul(st->codec->codec_type);

  513.     MXFStreamContext *sc = st->priv_data;

  514. 

  515.     // find data define uls

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

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

  518. 

  519.     // write duration

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

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

  522. }

  523. 

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

  525. {

  526.     ByteIOContext *pb = s->pb;

  527. 

  528.     mxf_write_metadata_key(pb, 0x010f00);

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

  530.     klv_encode_ber_length(pb, 80);

  531. 

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

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

  534. 

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

  536.     mxf_write_common_fields(pb, st);

  537. 

  538.     // write structural component

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

  540.     mxf_write_refs_count(pb, 1);

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

  542. }

  543. 

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

  545. {

  546.     ByteIOContext *pb = s->pb;

  547.     int i;

  548. 

  549.     mxf_write_metadata_key(pb, 0x011100);

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

  551.     klv_encode_ber_length(pb, 108);

  552. 

  553.     // write uid

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

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

  556. 

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

  558.     mxf_write_common_fields(pb, st);

  559. 

  560.     // write start_position

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

  562.     put_be64(pb, 0);

  563. 

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

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

  566.     if (type == SourcePackage) {

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

  568.             put_be64(pb, 0);

  569.     } else

  570.         mxf_write_umid(pb, SourcePackage, 0);

  571. 

  572.     // write source track id

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

  574.     if (type == SourcePackage)

  575.         put_be32(pb, 0);

  576.     else

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

  578. }

  579. 

  580. static void mxf_write_multi_descriptor(AVFormatContext *s)

  581. {

  582.     MXFContext *mxf = s->priv_data;

  583.     ByteIOContext *pb = s->pb;

  584.     int i;

  585. 

  586.     mxf_write_metadata_key(pb, 0x014400);

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

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

  589. 

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

  591.     mxf_write_uuid(pb, MultipleDescriptor, 0);

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

  593. 

  594.     // write sample rate

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

  596.     put_be32(pb, mxf->time_base.den);

  597.     put_be32(pb, mxf->time_base.num);

  598. 

  599.     // write essence container ul

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

  601.     put_buffer(pb, multiple_desc_ul, 16);

  602. 

  603.     // write sub descriptor refs

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

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

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

  607.         mxf_write_uuid(pb, SubDescriptor, i);

  608. }

  609. 

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

  611. {

  612.     MXFContext *mxf = s->priv_data;

  613.     MXFStreamContext *sc = st->priv_data;

  614.     ByteIOContext *pb = s->pb;

  615. 

  616.     put_buffer(pb, key, 16);

  617.     klv_encode_ber_length(pb, size);

  618. 

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

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

  621. 

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

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

  624. 

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

  626.     put_be32(pb, mxf->time_base.den);

  627.     put_be32(pb, mxf->time_base.num);

  628. 

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

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

  631. }

  632. 

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

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

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

  636. 

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

  638. {

  639.     MXFStreamContext *sc = st->priv_data;

  640.     ByteIOContext *pb = s->pb;

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

  642.     AVRational dar;

  643.     int f1, f2;

  644. 

  645.     mxf_write_generic_desc(s, st, mxf_mpegvideo_descriptor_key, 153+sc->interlaced*4);

  646. 

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

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

  649. 

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

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

  652. 

  653.     mxf_write_local_tag(pb, 4, 0x3209);

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

  655. 

  656.     mxf_write_local_tag(pb, 4, 0x3208);

  657.     put_be32(pb, st->codec->height>>sc->interlaced);

  658. 

  659.     // bit rate

  660.     mxf_write_local_tag(pb, 4, 0x8000);

  661.     put_be32(pb, st->codec->bit_rate);

  662. 

  663.     // frame layout

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

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

  666. 

  667.     // video line map

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

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

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

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

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

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

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

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

  676.     }

  677. 

  678.     if (!sc->interlaced) {

  679.         f2  = 0;

  680.         f1 *= 2;

  681.     }

  682. 

  683.     mxf_write_local_tag(pb, 12+sc->interlaced*4, 0x320D);

  684.     put_be32(pb, sc->interlaced ? 2 : 1);

  685.     put_be32(pb, 4);

  686.     put_be32(pb, f1);

  687.     if (sc->interlaced)

  688.         put_be32(pb, f2);

  689. 

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

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

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

  693.               1024*1024);

  694. 

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

  696.     put_be32(pb, dar.num);

  697.     put_be32(pb, dar.den);

  698. 

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

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

  701. }

  702. 

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

  704. {

  705.     ByteIOContext *pb = s->pb;

  706. 

  707.     mxf_write_generic_desc(s, st, key, size);

  708. 

  709.     // audio locked

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

  711.     put_byte(pb, 1);

  712. 

  713.     // write audio sampling rate

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

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

  716.     put_be32(pb, 1);

  717. 

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

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

  720. 

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

  722.     put_be32(pb, av_get_bits_per_sample(st->codec->codec_id));

  723. }

  724. 

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

  726. {

  727.     ByteIOContext *pb = s->pb;

  728. 

  729.     mxf_write_generic_sound_desc(s, st, key, size);

  730. 

  731.     mxf_write_local_tag(pb, 2, 0x3D0A);

  732.     put_be16(pb, st->codec->block_align);

  733. 

  734.     // avg bytes per sec

  735.     mxf_write_local_tag(pb, 4, 0x3D09);

  736.     put_be32(pb, st->codec->block_align*st->codec->sample_rate);

  737. }

  738. 

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

  740. {

  741.     mxf_write_wav_common_desc(s, st, mxf_wav_descriptor_key, 107);

  742. }

  743. 

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

  745. {

  746.     mxf_write_wav_common_desc(s, st, mxf_aes3_descriptor_key, 107);

  747. }

  748. 

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

  750. {

  751.     MXFContext *mxf = s->priv_data;

  752.     ByteIOContext *pb = s->pb;

  753.     int i;

  754. 

  755.     if (type == MaterialPackage) {

  756.         mxf_write_metadata_key(pb, 0x013600);

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

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

  759.     } else {

  760.         mxf_write_metadata_key(pb, 0x013700);

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

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

  763.     }

  764. 

  765.     // write uid

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

  767.     mxf_write_uuid(pb, type, 0);

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

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

  770. 

  771.     // write package umid

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

  773.     mxf_write_umid(pb, type, 0);

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

  775. 

  776.     // package creation date

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

  778.     put_be64(pb, mxf->timestamp);

  779. 

  780.     // package modified date

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

  782.     put_be64(pb, mxf->timestamp);

  783. 

  784.     // write track refs

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

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

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

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

  789. 

  790.     // write multiple descriptor reference

  791.     if (type == SourcePackage) {

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

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

  794.             mxf_write_uuid(pb, MultipleDescriptor, 0);

  795.             mxf_write_multi_descriptor(s);

  796.         } else

  797.             mxf_write_uuid(pb, SubDescriptor, 0);

  798.     }

  799. 

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

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

  802.         mxf_write_track(s, st, type);

  803.         mxf_write_sequence(s, st, type);

  804.         mxf_write_structural_component(s, st, type);

  805. 

  806.         if (type == SourcePackage) {

  807.             MXFStreamContext *sc = st->priv_data;

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

  809.         }

  810.     }

  811. }

  812. 

  813. static int mxf_write_essence_container_data(AVFormatContext *s)

  814. {

  815.     ByteIOContext *pb = s->pb;

  816. 

  817.     mxf_write_metadata_key(pb, 0x012300);

  818.     klv_encode_ber_length(pb, 72);

  819. 

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

  821.     mxf_write_uuid(pb, EssenceContainerData, 0);

  822. 

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

  824.     mxf_write_umid(pb, SourcePackage, 0);

  825. 

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

  827.     put_be32(pb, 1);

  828. 

  829.     mxf_write_local_tag(pb, 4, 0x3F06); // IndexSID

  830.     put_be32(pb, 2);

  831. 

  832.     return 0;

  833. }

  834. 

  835. static int mxf_write_header_metadata_sets(AVFormatContext *s)

  836. {

  837.     mxf_write_preface(s);

  838.     mxf_write_identification(s);

  839.     mxf_write_content_storage(s);

  840.     mxf_write_package(s, MaterialPackage);

  841.     mxf_write_package(s, SourcePackage);

  842.     mxf_write_essence_container_data(s);

  843.     return 0;

  844. }

  845. 

  846. static unsigned klv_fill_size(uint64_t size)

  847. {

  848.     unsigned pad = KAG_SIZE - (size & (KAG_SIZE-1));

  849.     if (pad < 17) // smallest fill item possible

  850.         return pad + KAG_SIZE;

  851.     else

  852.         return pad & (KAG_SIZE-1);

  853. }

  854. 

  855. static int mxf_write_index_table_segment(AVFormatContext *s)

  856. {

  857.     MXFContext *mxf = s->priv_data;

  858.     ByteIOContext *pb = s->pb;

  859.     int i, j, ret;

  860.     int temporal_reordering = 0;

  861.     int last_key_index = 0, key_index = 0;

  862. 

  863.     av_log(s, AV_LOG_DEBUG, "edit units count %d\n", mxf->edit_units_count);

  864. 

  865.     put_buffer(pb, index_table_segment_key, 16);

  866.     ret = klv_encode_ber_length(pb, 109 + (s->nb_streams+1)*6 +

  867.                                 mxf->edit_units_count*(11+mxf->slice_count*4));

  868. 

  869.     // instance id

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

  871.     mxf_write_uuid(pb, IndexTableSegment, 0);

  872. 

  873.     // index edit rate

  874.     mxf_write_local_tag(pb, 8, 0x3F0B);

  875.     put_be32(pb, mxf->time_base.num);

  876.     put_be32(pb, mxf->time_base.den);

  877. 

  878.     // index start position

  879.     mxf_write_local_tag(pb, 8, 0x3F0C);

  880.     put_be64(pb, 0);

  881. 

  882.     // index duration

  883.     mxf_write_local_tag(pb, 8, 0x3F0D);

  884.     put_be64(pb, mxf->edit_units_count);

  885. 

  886.     // edit unit byte count

  887.     mxf_write_local_tag(pb, 4, 0x3F05);

  888.     put_be32(pb, 0);

  889. 

  890.     // index sid

  891.     mxf_write_local_tag(pb, 4, 0x3F06);

  892.     put_be32(pb, 2);

  893. 

  894.     // body sid

  895.     mxf_write_local_tag(pb, 4, 0x3F07);

  896.     put_be32(pb, 1);

  897. 

  898.     // real slice count - 1

  899.     mxf_write_local_tag(pb, 1, 0x3F08);

  900.     put_byte(pb, mxf->slice_count);

  901. 

  902.     // delta entry array

  903.     mxf_write_local_tag(pb, 8 + (s->nb_streams+1)*6, 0x3F09);

  904.     put_be32(pb, s->nb_streams+1); // num of entries

  905.     put_be32(pb, 6);             // size of one entry

  906.     // write system item delta entry

  907.     put_byte(pb, 0);

  908.     put_byte(pb, 0); // slice entry

  909.     put_be32(pb, 0); // element delta

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

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

  912.         MXFStreamContext *sc = st->priv_data;

  913.         put_byte(pb, sc->temporal_reordering);

  914.         if (sc->temporal_reordering)

  915.             temporal_reordering = 1;

  916.         // slice number

  917.         if (i == 0) { // video track

  918.             put_byte(pb, 0); // slice number

  919.             put_be32(pb, KAG_SIZE); // system item size including klv fill

  920.         } else { // audio track

  921.             unsigned audio_frame_size = sc->aic.samples[0]*sc->aic.sample_size;

  922.             audio_frame_size += klv_fill_size(audio_frame_size);

  923.             put_byte(pb, 1);

  924.             put_be32(pb, (i-1)*audio_frame_size); // element delta

  925.         }

  926.     }

  927. 

  928.     mxf_write_local_tag(pb, 8 + mxf->edit_units_count*(11+mxf->slice_count*4), 0x3F0A);

  929.     put_be32(pb, mxf->edit_units_count);  // num of entries

  930.     put_be32(pb, 11+mxf->slice_count*4);  // size of one entry

  931.     for (i = 0; i < mxf->edit_units_count; i++) {

  932.         if (temporal_reordering) {

  933.             int temporal_offset = 0;

  934.             for (j = i+1; j < mxf->edit_units_count; j++) {

  935.                 temporal_offset++;

  936.                 if (mxf->index_entries[j].flags & 0x10) { // backward prediction

  937.                     // next is not b, so is reordered

  938.                     if (!(mxf->index_entries[i+1].flags & 0x10)) {

  939.                         if ((mxf->index_entries[i].flags & 0x11) == 0) // i frame

  940.                             temporal_offset = 0;

  941.                         else

  942.                             temporal_offset = -temporal_offset;

  943.                     }

  944.                     break;

  945.                 }

  946.             }

  947.             put_byte(pb, temporal_offset);

  948.         } else

  949.             put_byte(pb, 0);

  950.         if (!(mxf->index_entries[i].flags & 0x33)) { // I frame

  951.             last_key_index = key_index;

  952.             key_index = i;

  953.         }

  954.         if (mxf->index_entries[i].flags & 0x10 && // backward prediction

  955.             !(mxf->index_entries[key_index].flags & 0x80)) { // open gop

  956.             put_byte(pb, last_key_index - i);

  957.         } else {

  958.             put_byte(pb, key_index - i); // key frame offset

  959.             if ((mxf->index_entries[i].flags & 0x20) == 0x20) // only forward

  960.                 last_key_index = key_index;

  961.         }

  962.         put_byte(pb, mxf->index_entries[i].flags);

  963.         // stream offset

  964.         put_be64(pb, mxf->index_entries[i].offset - mxf->index_entries[0].offset);

  965.         if (s->nb_streams > 1)

  966.             put_be32(pb, mxf->index_entries[i].slice_offset);

  967.     }

  968. 

  969.     return ret;

  970. }

  971. 

  972. static void mxf_write_partition(AVFormatContext *s, int bodysid,

  973.                                 int indexsid, unsigned index_byte_count,

  974.                                 const uint8_t *key, int write_metadata)

  975. {

  976.     MXFContext *mxf = s->priv_data;

  977.     ByteIOContext *pb = s->pb;

  978.     int64_t header_byte_count_offset;

  979. 

  980.     // write klv

  981.     put_buffer(pb, key, 16);

  982. 

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

  984. 

  985.     // write partition value

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

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

  988.     put_be32(pb, KAG_SIZE); // KAGSize

  989. 

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

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

  992. 

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

  994. 

  995.     // set offset

  996.     header_byte_count_offset = url_ftell(pb);

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

  998. 

  999.     // indexTable

  1000.     put_be64(pb, index_byte_count); // indexByteCount

  1001.     put_be32(pb, indexsid); // indexSID

  1002.     put_be64(pb, 0); // bodyOffset

  1003. 

  1004.     put_be32(pb, bodysid); // bodySID

  1005.     put_buffer(pb, op1a_ul, 16); // operational pattern

  1006. 

  1007.     // essence container

  1008.     mxf_write_essence_container_refs(s);

  1009. 

  1010.     if (write_metadata) {

  1011.         // mark the start of the headermetadata and calculate metadata size

  1012.         int64_t pos, start = url_ftell(s->pb);

  1013.         unsigned header_byte_count;

  1014. 

  1015.         mxf_write_primer_pack(s);

  1016.         mxf_write_header_metadata_sets(s);

  1017.         pos = url_ftell(s->pb);

  1018.         header_byte_count = pos - start + klv_fill_size(pos);

  1019. 

  1020.         // update header_byte_count

  1021.         url_fseek(pb, header_byte_count_offset, SEEK_SET);

  1022.         put_be64(pb, header_byte_count);

  1023.         url_fseek(pb, pos, SEEK_SET);

  1024.     }

  1025. 

  1026.     put_flush_packet(pb);

  1027. }

  1028. 

  1029. static const UID mxf_mpeg2_codec_uls[] = {

  1030.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x10,0x00 }, // MP-ML I-Frame

  1031.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, // MP-ML Long GOP

  1032.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, // 422P-ML I-Frame

  1033.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, // 422P-ML Long GOP

  1034.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x02,0x00 }, // MP-HL I-Frame

  1035.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, // MP-HL Long GOP

  1036.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, // 422P-HL I-Frame

  1037.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, // 422P-HL Long GOP

  1038. };

  1039. 

  1040. static const UID *mxf_get_mpeg2_codec_ul(AVCodecContext *avctx)

  1041. {

  1042.     if (avctx->profile == 4) { // Main

  1043.         if (avctx->level == 8) // Main

  1044.             return avctx->gop_size ?

  1045.                 &mxf_mpeg2_codec_uls[1] :

  1046.                 &mxf_mpeg2_codec_uls[0];

  1047.         else if (avctx->level == 4) // High

  1048.             return avctx->gop_size ?

  1049.                 &mxf_mpeg2_codec_uls[5] :

  1050.                 &mxf_mpeg2_codec_uls[4];

  1051.     } else if (avctx->profile == 0) { // 422

  1052.         if (avctx->level == 5) // Main

  1053.             return avctx->gop_size ?

  1054.                 &mxf_mpeg2_codec_uls[3] :

  1055.                 &mxf_mpeg2_codec_uls[2];

  1056.         else if (avctx->level == 2) // High

  1057.             return avctx->gop_size ?

  1058.                 &mxf_mpeg2_codec_uls[7] :

  1059.                 &mxf_mpeg2_codec_uls[6];

  1060.     }

  1061.     return NULL;

  1062. }

  1063. 

  1064. static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st, AVPacket *pkt)

  1065. {

  1066.     MXFContext *mxf = s->priv_data;

  1067.     MXFStreamContext *sc = st->priv_data;

  1068.     uint32_t c = -1;

  1069.     int i;

  1070. 

  1071.     mxf->index_entries[mxf->edit_units_count].flags = 0;

  1072. 

  1073.     for(i = 0; i < pkt->size - 4; i++) {

  1074.         c = (c<<8) + pkt->data[i];

  1075.         if (c == 0x1B5) {

  1076.             if (i + 2 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x10) { // seq ext

  1077.                 st->codec->profile = pkt->data[i+1] & 0x07;

  1078.                 st->codec->level   = pkt->data[i+2] >> 4;

  1079.             } else if (i + 5 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x80) { // pict coding ext

  1080.                 sc->interlaced = !(pkt->data[i+5] & 0x80); // progressive frame

  1081.                 break;

  1082.             }

  1083.         } else if (c == 0x1b8) { // gop

  1084.             if (i + 4 < pkt->size && pkt->data[i+4]>>6 & 0x01) // closed

  1085.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x80; // random access

  1086.         } else if (c == 0x1b3) { // seq

  1087.             mxf->index_entries[mxf->edit_units_count].flags |= 0x40;

  1088.         } else if (c == 0x100) { // pic

  1089.             int pict_type = (pkt->data[i+2]>>3) & 0x07;

  1090.             if (pict_type == 2) { // P frame

  1091.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x22;

  1092.                 st->codec->gop_size = 1;

  1093.             } else if (pict_type == 3) { // B frame

  1094.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x33;

  1095.                 sc->temporal_reordering = -1;

  1096.             } else if (!pict_type) {

  1097.                 av_log(s, AV_LOG_ERROR, "error parsing mpeg2 frame\n");

  1098.                 return 0;

  1099.             }

  1100.         }

  1101.     }

  1102.     sc->codec_ul = mxf_get_mpeg2_codec_ul(st->codec);

  1103.     return !!sc->codec_ul;

  1104. }

  1105. 

  1106. static uint64_t mxf_parse_timestamp(time_t timestamp)

  1107. {

  1108.     struct tm *time = localtime(&timestamp);

  1109.     return (uint64_t)(time->tm_year+1900) << 48 |

  1110.            (uint64_t)(time->tm_mon+1)     << 40 |

  1111.            (uint64_t) time->tm_mday       << 32 |

  1112.                       time->tm_hour       << 24 |

  1113.                       time->tm_min        << 16 |

  1114.                       time->tm_sec        << 8;

  1115. }

  1116. 

  1117. static int mxf_write_header(AVFormatContext *s)

  1118. {

  1119.     MXFContext *mxf = s->priv_data;

  1120.     int i;

  1121.     uint8_t present[FF_ARRAY_ELEMS(mxf_essence_container_uls)] = {0};

  1122.     const int *samples_per_frame = NULL;

  1123. 

  1124.     if (s->nb_streams > 17) {

  1125.         av_log(s, AV_LOG_ERROR, "error, mxf muxer supports 17 tracks maximum\n");

  1126.         return -1;

  1127.     }

  1128. 

  1129.     for (i = 0; i < s->nb_streams; i++) {

  1130.         AVStream *st = s->streams[i];

  1131.         MXFStreamContext *sc = av_mallocz(sizeof(*sc));

  1132.         if (!sc)

  1133.             return AVERROR(ENOMEM);

  1134.         st->priv_data = sc;

  1135. 

  1136.         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

  1137.             if (i != 0) {

  1138.                 av_log(s, AV_LOG_ERROR, "video stream must be first track\n");

  1139.                 return -1;

  1140.             }

  1141.             if (fabs(av_q2d(st->codec->time_base) - 1/25.0) < 0.0001) {

  1142.                 samples_per_frame = PAL_samples_per_frame;

  1143.                 mxf->time_base = (AVRational){ 1, 25 };

  1144.             } else if (fabs(av_q2d(st->codec->time_base) - 1001/30000.0) < 0.0001) {

  1145.                 samples_per_frame = NTSC_samples_per_frame;

  1146.                 mxf->time_base = (AVRational){ 1001, 30000 };

  1147.             } else {

  1148.                 av_log(s, AV_LOG_ERROR, "unsupported video frame rate\n");

  1149.                 return -1;

  1150.             }

  1151.             av_set_pts_info(st, 64, mxf->time_base.num, mxf->time_base.den);

  1152.         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1153.             if (st->codec->sample_rate != 48000) {

  1154.                 av_log(s, AV_LOG_ERROR, "only 48khz is implemented\n");

  1155.                 return -1;

  1156.             }

  1157.             av_set_pts_info(st, 64, 1, st->codec->sample_rate);

  1158.             mxf->slice_count = 1;

  1159.         }

  1160.         sc->duration = -1;

  1161. 

  1162.         sc->index = mxf_get_essence_container_ul_index(st->codec->codec_id);

  1163.         if (sc->index == -1) {

  1164.             av_log(s, AV_LOG_ERROR, "track %d: could not find essence container ul, "

  1165.                    "codec not currently supported in container\n", i);

  1166.             return -1;

  1167.         }

  1168. 

  1169.         sc->codec_ul = &mxf_essence_container_uls[sc->index].codec_ul;

  1170. 

  1171.         if (!present[sc->index]) {

  1172.             mxf->essence_containers_indices[mxf->essence_container_count++] = sc->index;

  1173.             present[sc->index] = 1;

  1174.         } else

  1175.             present[sc->index]++;

  1176.         memcpy(sc->track_essence_element_key, mxf_essence_container_uls[sc->index].element_ul, 15);

  1177.         sc->track_essence_element_key[15] = present[sc->index];

  1178.         PRINT_KEY(s, "track essence element key", sc->track_essence_element_key);

  1179.     }

  1180. 

  1181.     for (i = 0; i < s->nb_streams; i++) {

  1182.         MXFStreamContext *sc = s->streams[i]->priv_data;

  1183.         // update element count

  1184.         sc->track_essence_element_key[13] = present[sc->index];

  1185.         sc->order = AV_RB32(sc->track_essence_element_key+12);

  1186.     }

  1187. 

  1188.     mxf->timestamp = mxf_parse_timestamp(s->timestamp);

  1189. 

  1190.     if (!samples_per_frame)

  1191.         samples_per_frame = PAL_samples_per_frame;

  1192. 

  1193.     if (ff_audio_interleave_init(s, samples_per_frame, mxf->time_base) < 0)

  1194.         return -1;

  1195. 

  1196.     return 0;

  1197. }

  1198. 

  1199. static void mxf_write_klv_fill(AVFormatContext *s)

  1200. {

  1201.     unsigned pad = klv_fill_size(url_ftell(s->pb));

  1202.     if (pad) {

  1203.         put_buffer(s->pb, klv_fill_key, 16);

  1204.         pad -= 16;

  1205.         pad -= klv_ber_length(pad);

  1206.         klv_encode_ber_length(s->pb, pad);

  1207.         for (; pad > 7; pad -= 8)

  1208.             put_be64(s->pb, 0);

  1209.         for (; pad; pad--)

  1210.             put_byte(s->pb, 0);

  1211.         assert(!(url_ftell(s->pb) & (KAG_SIZE-1)));

  1212.     }

  1213. }

  1214. 

  1215. static const uint8_t system_metadata_pack_key[]        = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x03,0x01,0x04,0x01,0x01,0x00 };

  1216. static const uint8_t system_metadata_package_set_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x43,0x01,0x01,0x0D,0x01,0x03,0x01,0x04,0x01,0x02,0x01 };

  1217. 

  1218. static uint32_t ff_framenum_to_12m_time_code(unsigned frame, int drop, int fps)

  1219. {

  1220.     return (0                                    << 31) | // color frame flag

  1221.            (0                                    << 30) | // drop  frame flag

  1222.            ( ((frame % fps) / 10)                << 28) | // tens  of frames

  1223.            ( ((frame % fps) % 10)                << 24) | // units of frames

  1224.            (0                                    << 23) | // field phase (NTSC), b0 (PAL)

  1225.            ((((frame / fps) % 60) / 10)          << 20) | // tens  of seconds

  1226.            ((((frame / fps) % 60) % 10)          << 16) | // units of seconds

  1227.            (0                                    << 15) | // b0 (NTSC), b2 (PAL)

  1228.            ((((frame / (fps * 60)) % 60) / 10)   << 12) | // tens  of minutes

  1229.            ((((frame / (fps * 60)) % 60) % 10)   <<  8) | // units of minutes

  1230.            (0                                    <<  7) | // b1

  1231.            (0                                    <<  6) | // b2 (NSC), field phase (PAL)

  1232.            ((((frame / (fps * 3600) % 24)) / 10) <<  4) | // tens  of hours

  1233.            (  (frame / (fps * 3600) % 24)) % 10;          // units of hours

  1234. }

  1235. 

  1236. static void mxf_write_system_item(AVFormatContext *s)

  1237. {

  1238.     MXFContext *mxf = s->priv_data;

  1239.     ByteIOContext *pb = s->pb;

  1240.     unsigned fps, frame;

  1241.     uint32_t time_code;

  1242. 

  1243.     frame = mxf->edit_units_count;

  1244. 

  1245.     // write system metadata pack

  1246.     put_buffer(pb, system_metadata_pack_key, 16);

  1247.     klv_encode_ber_length(pb, 57);

  1248.     put_byte(pb, 0x5c); // UL, user date/time stamp, picture and sound item present

  1249.     put_byte(pb, 0x04); // content package rate

  1250.     put_byte(pb, 0x00); // content package type

  1251.     put_be16(pb, 0x00); // channel handle

  1252.     put_be16(pb, frame); // continuity count

  1253.     if (mxf->essence_container_count > 1)

  1254.         put_buffer(pb, multiple_desc_ul, 16);

  1255.     else

  1256.         put_buffer(pb, mxf_essence_container_uls[mxf->essence_containers_indices[0]].container_ul, 16);

  1257.     put_byte(pb, 0);

  1258.     put_be64(pb, 0);

  1259.     put_be64(pb, 0); // creation date/time stamp

  1260. 

  1261.     // XXX drop frame

  1262.     if (mxf->time_base.den == 30000) fps = 30;

  1263.     else                             fps = 25;

  1264. 

  1265.     put_byte(pb, 0x81); // SMPTE 12M time code

  1266.     time_code = ff_framenum_to_12m_time_code(frame, 0, fps);

  1267.     put_be32(pb, time_code);

  1268.     put_be32(pb, 0); // binary group data

  1269.     put_be64(pb, 0);

  1270. 

  1271.     // write system metadata package set

  1272.     put_buffer(pb, system_metadata_package_set_key, 16);

  1273.     klv_encode_ber_length(pb, 35);

  1274.     put_byte(pb, 0x83); // UMID

  1275.     put_be16(pb, 0x20);

  1276.     mxf_write_umid(pb, SourcePackage, 0);

  1277. }

  1278. 

  1279. static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)

  1280. {

  1281.     MXFContext *mxf = s->priv_data;

  1282.     ByteIOContext *pb = s->pb;

  1283.     AVStream *st = s->streams[pkt->stream_index];

  1284.     MXFStreamContext *sc = st->priv_data;

  1285. 

  1286.     if (!(mxf->edit_units_count % MXF_INDEX_CLUSTER_SIZE)) {

  1287.         mxf->index_entries = av_realloc(mxf->index_entries,

  1288.             (mxf->edit_units_count + MXF_INDEX_CLUSTER_SIZE)*

  1289.              sizeof(*mxf->index_entries));

  1290.         if (!mxf->index_entries) {

  1291.             av_log(s, AV_LOG_ERROR, "could not allocate index entries\n");

  1292.             return -1;

  1293.         }

  1294.     }

  1295. 

  1296.     if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {

  1297.         if (!mxf_parse_mpeg2_frame(s, st, pkt)) {

  1298.             av_log(s, AV_LOG_ERROR, "could not get mpeg2 profile and level\n");

  1299.             return -1;

  1300.         }

  1301.     }

  1302. 

  1303.     if (!mxf->header_written) {

  1304.         mxf_write_partition(s, 1, 0, 0, header_open_partition_key, 1);

  1305.         mxf->header_written = 1;

  1306.     }

  1307. 

  1308.     mxf_write_klv_fill(s);

  1309. 

  1310.     if (st->index == 0) {

  1311.         mxf->index_entries[mxf->edit_units_count].offset = url_ftell(pb);

  1312. 

  1313.         mxf_write_system_item(s);

  1314.         mxf_write_klv_fill(s);

  1315. 

  1316.         mxf->edit_units_count++;

  1317.     } else if (st->index == 1) {

  1318.         mxf->index_entries[mxf->edit_units_count-1].slice_offset =

  1319.             url_ftell(pb) - mxf->index_entries[mxf->edit_units_count-1].offset;

  1320.     }

  1321. 

  1322.     put_buffer(pb, sc->track_essence_element_key, 16); // write key

  1323.     klv_encode_ber_length(pb, pkt->size); // write length

  1324.     put_buffer(pb, pkt->data, pkt->size); // write value

  1325. 

  1326.     sc->duration = FFMAX(pkt->pts + pkt->duration, sc->duration);

  1327. 

  1328.     put_flush_packet(pb);

  1329.     return 0;

  1330. }

  1331. 

  1332. static void mxf_write_random_index_pack(AVFormatContext *s)

  1333. {

  1334.     MXFContext *mxf = s->priv_data;

  1335.     ByteIOContext *pb = s->pb;

  1336.     uint64_t pos = url_ftell(pb);

  1337. 

  1338.     put_buffer(pb, random_index_pack_key, 16);

  1339.     klv_encode_ber_length(pb, 28);

  1340. 

  1341.     put_be32(pb, 1); // BodySID of header partition

  1342.     put_be64(pb, 0); // offset of header partition

  1343. 

  1344.     put_be32(pb, 0); // BodySID of footer partition

  1345.     put_be64(pb, mxf->footer_partition_offset);

  1346. 

  1347.     put_be32(pb, url_ftell(pb) - pos + 4);

  1348. }

  1349. 

  1350. static int mxf_write_footer(AVFormatContext *s)

  1351. {

  1352.     MXFContext *mxf = s->priv_data;

  1353.     ByteIOContext *pb = s->pb;

  1354.     unsigned index_byte_count =

  1355.         109 + (s->nb_streams+1)*6 +

  1356.         mxf->edit_units_count*(11+mxf->slice_count*4);

  1357. 

  1358.     // add encoded ber length

  1359.     index_byte_count += 16 + klv_ber_length(index_byte_count);

  1360. 

  1361.     mxf_write_klv_fill(s);

  1362. 

  1363.     mxf->footer_partition_offset = url_ftell(pb);

  1364.     mxf_write_partition(s, 0, 2, index_byte_count, footer_partition_key, 0);

  1365. 

  1366.     mxf_write_index_table_segment(s);

  1367. 

  1368.     mxf_write_random_index_pack(s);

  1369. 

  1370.     if (!url_is_streamed(s->pb)) {

  1371.         url_fseek(pb, 0, SEEK_SET);

  1372.         mxf_write_partition(s, 1, 0, 0, header_closed_partition_key, 1);

  1373.     }

  1374. 

  1375.     ff_audio_interleave_close(s);

  1376. 

  1377.     av_freep(&mxf->index_entries);

  1378. 

  1379.     mxf_free(s);

  1380.     return 0;

  1381. }

  1382. 

  1383. static int mxf_interleave_get_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

  1384. {

  1385.     AVPacketList *pktl;

  1386.     int stream_count = 0;

  1387.     int streams[MAX_STREAMS];

  1388. 

  1389.     memset(streams, 0, sizeof(streams));

  1390.     pktl = s->packet_buffer;

  1391.     while (pktl) {

  1392.         //av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);

  1393.         if (!streams[pktl->pkt.stream_index])

  1394.             stream_count++;

  1395.         streams[pktl->pkt.stream_index]++;

  1396.         pktl = pktl->next;

  1397.     }

  1398. 

  1399.     if (stream_count && (s->nb_streams == stream_count || flush)) {

  1400.         pktl = s->packet_buffer;

  1401.         if (s->nb_streams != stream_count) {

  1402.             AVPacketList *first = NULL;

  1403.             // find first packet in edit unit

  1404.             while (pktl) {

  1405.                 AVStream *st = s->streams[pktl->pkt.stream_index];

  1406.                 if (st->index == 0)

  1407.                     break;

  1408.                 else if (!first)

  1409.                     first = pktl;

  1410.                 pktl = pktl->next;

  1411.             }

  1412.             // purge packet queue

  1413.             while (pktl) {

  1414.                 AVPacketList *next = pktl->next;

  1415.                 av_free_packet(&pktl->pkt);

  1416.                 av_freep(&pktl);

  1417.                 pktl = next;

  1418.             }

  1419.             if (!first)

  1420.                 goto out;

  1421.             pktl = first;

  1422.         }

  1423. 

  1424.         *out = pktl->pkt;

  1425.         //av_log(s, AV_LOG_DEBUG, "out st:%d dts:%lld\n", (*out).stream_index, (*out).dts);

  1426.         s->packet_buffer = pktl->next;

  1427.         av_freep(&pktl);

  1428.         return 1;

  1429.     } else {

  1430.     out:

  1431.         av_init_packet(out);

  1432.         return 0;

  1433.     }

  1434. }

  1435. 

  1436. static int mxf_compare_timestamps(AVFormatContext *s, AVPacket *next, AVPacket *pkt)

  1437. {

  1438.     MXFStreamContext *sc  = s->streams[pkt ->stream_index]->priv_data;

  1439.     MXFStreamContext *sc2 = s->streams[next->stream_index]->priv_data;

  1440. 

  1441.     return next->dts > pkt->dts ||

  1442.         (next->dts == pkt->dts && sc->order < sc2->order);

  1443. }

  1444. 

  1445. static int mxf_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

  1446. {

  1447.     return ff_audio_interleave(s, out, pkt, flush,

  1448.                                mxf_interleave_get_packet, mxf_compare_timestamps);

  1449. }

  1450. 

  1451. AVOutputFormat mxf_muxer = {

  1452.     "mxf",

  1453.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1454.     NULL,

  1455.     "mxf",

  1456.     sizeof(MXFContext),

  1457.     CODEC_ID_PCM_S16LE,

  1458.     CODEC_ID_MPEG2VIDEO,

  1459.     mxf_write_header,

  1460.     mxf_write_packet,

  1461.     mxf_write_footer,

  1462.     AVFMT_NOTIMESTAMPS,

  1463.     NULL,

  1464.     mxf_interleave,

  1465. };