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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. 

  37. #include "libavutil/fifo.h"

  38. #include "mxf.h"

  39. 

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

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

  42. 

  43. #define MXF_INDEX_CLUSTER_SIZE 4096

  44. 

  45. typedef struct {

  46.     AVFifoBuffer fifo;

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

  48.     uint64_t dts;                 ///< current dts

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

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

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

  52.     AVRational time_base;         ///< time base of output audio packets

  53. } AudioInterleaveContext;

  54. 

  55. typedef struct {

  56.     int local_tag;

  57.     UID uid;

  58. } MXFLocalTagPair;

  59. 

  60. typedef struct {

  61.     uint8_t flags;

  62.     uint64_t offset;

  63.     unsigned slice_offset[17]; // one video, 16 audio

  64. } MXFIndexEntry;

  65. 

  66. typedef struct {

  67.     AudioInterleaveContext aic;

  68.     UID track_essence_element_key;

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

  70.     const UID *codec_ul;

  71.     int64_t duration;

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

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

  74.     int temporal_reordering;

  75. } MXFStreamContext;

  76. 

  77. typedef struct {

  78.     UID container_ul;

  79.     UID element_ul;

  80.     UID codec_ul;

  81.     void (*write_desc)();

  82. } MXFContainerEssenceEntry;

  83. 

  84. static const struct {

  85.     enum CodecID id;

  86.     int index;

  87. } mxf_essence_mappings[] = {

  88.     { CODEC_ID_MPEG2VIDEO, 0 },

  89.     { CODEC_ID_PCM_S24LE,  1 },

  90.     { CODEC_ID_PCM_S16LE,  1 },

  91.     { 0 }

  92. };

  93. 

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

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

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

  97. 

  98. static const MXFContainerEssenceEntry mxf_essence_container_uls[] = {

  99.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 },

  100.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

  101.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x00,0x00,0x00 },

  102.       mxf_write_mpegvideo_desc },

  103.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },

  104.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x03,0x00 },

  105.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },

  106.       mxf_write_aes3_desc },

  107.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },

  108.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x01,0x00 },

  109.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },

  110.       mxf_write_wav_desc },

  111.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  112.       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  113.       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  114.       NULL },

  115. };

  116. 

  117. typedef struct MXFContext {

  118.     int64_t footer_partition_offset;

  119.     int essence_container_count;

  120.     uint8_t essence_containers_indices[FF_ARRAY_ELEMS(mxf_essence_container_uls)];

  121.     AVRational time_base;

  122.     int header_written;

  123.     MXFIndexEntry *index_entries;

  124.     unsigned edit_units_count;

  125.     int edit_unit_start;  ///< index of the stream starting edit unit

  126. } MXFContext;

  127. 

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

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

  130. 

  131. /**

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

  133.  */

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

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

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

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

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

  139. 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

  140. 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

  141. 

  142. /**

  143.  * partial key for header metadata

  144.  */

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

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

  147. 

  148. /**

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

  150.  */

  151. static const MXFLocalTagPair mxf_local_tag_batch[] = {

  152.     // preface set

  153.     { 0x3C0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x02,0x00,0x00,0x00,0x00}}, /* Instance UID */

  154.     { 0x3B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x04,0x00,0x00}}, /* Last Modified Date */

  155.     { 0x3B05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x03,0x01,0x02,0x01,0x05,0x00,0x00,0x00}}, /* Version */

  156.     { 0x3B06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x04,0x00,0x00}}, /* Identifications reference */

  157.     { 0x3B03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x01,0x00,0x00}}, /* Content Storage reference */

  158.     { 0x3B09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x03,0x00,0x00,0x00,0x00}}, /* Operational Pattern UL */

  159.     { 0x3B0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x01,0x00,0x00}}, /* Essence Containers UL batch */

  160.     { 0x3B0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x02,0x00,0x00}}, /* DM Schemes UL batch */

  161.     // Identification

  162.     { 0x3C09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x01,0x00,0x00,0x00}}, /* This Generation UID */

  163.     { 0x3C01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x02,0x01,0x00,0x00}}, /* Company Name */

  164.     { 0x3C02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x03,0x01,0x00,0x00}}, /* Product Name */

  165.     { 0x3C04, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x05,0x01,0x00,0x00}}, /* Version String */

  166.     { 0x3C05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x07,0x00,0x00,0x00}}, /* Product ID */

  167.     { 0x3C06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x03,0x00,0x00}}, /* Modification Date */

  168.     // Content Storage

  169.     { 0x1901, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x01,0x00,0x00}}, /* Package strong reference batch */

  170.     { 0x1902, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x02,0x00,0x00}}, /* Package strong reference batch */

  171.     // Essence Container Data

  172.     { 0x2701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x06,0x01,0x00,0x00,0x00}}, /* Linked Package UID */

  173.     { 0x3F07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x04,0x00,0x00,0x00,0x00}}, /* BodySID */

  174.     // Package

  175.     { 0x4401, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x10,0x00,0x00,0x00,0x00}}, /* Package UID */

  176.     { 0x4405, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x01,0x03,0x00,0x00}}, /* Package Creation Date */

  177.     { 0x4404, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x05,0x00,0x00}}, /* Package Modified Date */

  178.     { 0x4403, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x05,0x00,0x00}}, /* Tracks Strong reference array */

  179.     { 0x4701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x03,0x00,0x00}}, /* Descriptor */

  180.     // Track

  181.     { 0x4801, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x07,0x01,0x01,0x00,0x00,0x00,0x00}}, /* Track ID */

  182.     { 0x4804, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x04,0x01,0x03,0x00,0x00,0x00,0x00}}, /* Track Number */

  183.     { 0x4B01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x30,0x04,0x05,0x00,0x00,0x00,0x00}}, /* Edit Rate */

  184.     { 0x4B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x03,0x00,0x00}}, /* Origin */

  185.     { 0x4803, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x04,0x00,0x00}}, /* Sequence reference */

  186.     // Sequence

  187.     { 0x0201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x07,0x01,0x00,0x00,0x00,0x00,0x00}}, /* Data Definition UL */

  188.     { 0x0202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x02,0x01,0x01,0x03,0x00,0x00}}, /* Duration */

  189.     { 0x1001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x09,0x00,0x00}}, /* Structural Components reference array */

  190.     // Source Clip

  191.     { 0x1201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x01,0x03,0x01,0x04,0x00,0x00}}, /* Start position */

  192.     { 0x1101, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x01,0x00,0x00,0x00}}, /* SourcePackageID */

  193.     { 0x1102, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x02,0x00,0x00,0x00}}, /* SourceTrackID */

  194.     // File Descriptor

  195.     { 0x3F01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x04,0x06,0x0B,0x00,0x00}}, /* Sub Descriptors reference array */

  196.     { 0x3006, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x06,0x01,0x01,0x03,0x05,0x00,0x00,0x00}}, /* Linked Track ID */

  197.     { 0x3001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x00,0x00,0x00,0x00}}, /* SampleRate */

  198.     { 0x3004, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x01,0x02,0x00,0x00}}, /* Essence Container */

  199.     // Generic Picture Essence Descriptor

  200.     { 0x320C, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Frame Layout */

  201.     { 0x320D, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x03,0x02,0x05,0x00,0x00,0x00}}, /* Video Line Map */

  202.     { 0x3203, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x02,0x00,0x00,0x00}}, /* Stored Width */

  203.     { 0x3202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x01,0x00,0x00,0x00}}, /* Stored Height */

  204.     { 0x3209, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0C,0x00,0x00,0x00}}, /* Display Width */

  205.     { 0x3208, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0B,0x00,0x00,0x00}}, /* Display Height */

  206.     { 0x320E, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x01,0x01,0x01,0x00,0x00,0x00}}, /* Aspect Ratio */

  207.     { 0x3201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x06,0x01,0x00,0x00,0x00,0x00}}, /* Picture Essence Coding */

  208.     // Generic Sound Essence Descriptor

  209.     { 0x3D02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Locked/Unlocked */

  210.     { 0x3D03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x01,0x01,0x00,0x00}}, /* Audio sampling rate */

  211.     { 0x3D07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x01,0x01,0x04,0x00,0x00,0x00}}, /* ChannelCount */

  212.     { 0x3D01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x03,0x04,0x00,0x00,0x00}}, /* Quantization bits */

  213.     { 0x3D06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x02,0x04,0x02,0x00,0x00,0x00,0x00}}, /* Sound Essence Compression */

  214.     // Index Table Segment

  215.     { 0x3F0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x05,0x30,0x04,0x06,0x00,0x00,0x00,0x00}}, /* Index Edit Rate */

  216.     { 0x3F0C, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x01,0x03,0x01,0x0A,0x00,0x00}}, /* Index Start Position */

  217.     { 0x3F0D, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x02,0x01,0x01,0x02,0x00,0x00}}, /* Index Duration */

  218.     { 0x3F05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x06,0x02,0x01,0x00,0x00,0x00,0x00,0x00}}, /* Edit Unit Byte Count */

  219.     { 0x3F06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x05,0x00,0x00,0x00,0x00}}, /* IndexSID */

  220.     { 0x3F08, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x04,0x04,0x01,0x01,0x00,0x00,0x00}}, /* Slice Count */

  221.     { 0x3F09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x04,0x04,0x01,0x06,0x00,0x00,0x00}}, /* Delta Entry Array */

  222.     { 0x3F0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x04,0x04,0x02,0x05,0x00,0x00,0x00}}, /* Index Entry Array */

  223.     // MPEG video Descriptor

  224.     { 0x8000, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x01,0x06,0x02,0x01,0x0B,0x00,0x00}}, /* BitRate */

  225.     // Wave Audio Essence Descriptor

  226.     { 0x3D09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x03,0x05,0x00,0x00,0x00}}, /* Average Bytes Per Second */

  227.     { 0x3D0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x02,0x01,0x00,0x00,0x00}}, /* Block Align */

  228. };

  229. 

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

  231. {

  232.     put_buffer(pb, uuid_base, 12);

  233.     put_be16(pb, type);

  234.     put_be16(pb, value);

  235. }

  236. 

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

  238. {

  239.     put_buffer(pb, umid_base, 16);

  240.     mxf_write_uuid(pb, type, value);

  241. }

  242. 

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

  244. {

  245.     put_be32(pb, ref_count);

  246.     put_be32(pb, 16);

  247. }

  248. 

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

  250. {

  251.     // Determine the best BER size

  252.     int size;

  253.     if (len < 128) {

  254.         //short form

  255.         put_byte(pb, len);

  256.         return 1;

  257.     }

  258. 

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

  260. 

  261.     // long form

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

  263.     while(size) {

  264.         size--;

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

  266.     }

  267.     return 0;

  268. }

  269. 

  270. /*

  271.  * Get essence container ul index

  272.  */

  273. static int mxf_get_essence_container_ul_index(enum CodecID id)

  274. {

  275.     int i;

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

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

  278.             return mxf_essence_mappings[i].index;

  279.     return -1;

  280. }

  281. 

  282. static void mxf_write_primer_pack(AVFormatContext *s)

  283. {

  284.     ByteIOContext *pb = s->pb;

  285.     int local_tag_number, i = 0;

  286. 

  287.     local_tag_number = FF_ARRAY_ELEMS(mxf_local_tag_batch);

  288. 

  289.     put_buffer(pb, primer_pack_key, 16);

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

  291. 

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

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

  294. 

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

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

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

  298.     }

  299. }

  300. 

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

  302. {

  303.     put_be16(pb, tag);

  304.     put_be16(pb, size);

  305. }

  306. 

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

  308. {

  309.     put_buffer(pb, header_metadata_key, 13);

  310.     put_be24(pb, value);

  311. }

  312. 

  313. static void mxf_free(AVFormatContext *s)

  314. {

  315.     int i;

  316. 

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

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

  319.         av_freep(&st->priv_data);

  320.     }

  321. }

  322. 

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

  324. {

  325.     const MXFDataDefinitionUL *uls = ff_mxf_data_definition_uls;

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

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

  328.             break;

  329.         uls++;

  330.     }

  331.     return uls;

  332. }

  333. 

  334. static void mxf_write_essence_container_refs(AVFormatContext *s)

  335. {

  336.     MXFContext *c = s->priv_data;

  337.     ByteIOContext *pb = s->pb;

  338.     int i;

  339. 

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

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

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

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

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

  345.     }

  346. }

  347. 

  348. static void mxf_write_preface(AVFormatContext *s)

  349. {

  350.     MXFContext *mxf = s->priv_data;

  351.     ByteIOContext *pb = s->pb;

  352. 

  353.     mxf_write_metadata_key(pb, 0x012f00);

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

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

  356. 

  357.     // write preface set uid

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

  359.     mxf_write_uuid(pb, Preface, 0);

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

  361. 

  362.     // write create date as unknown

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

  364.     put_be64(pb, 0);

  365. 

  366.     // write version

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

  368.     put_be16(pb, 1);

  369. 

  370.     // write identification_refs

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

  372.     mxf_write_refs_count(pb, 1);

  373.     mxf_write_uuid(pb, Identification, 0);

  374. 

  375.     // write content_storage_refs

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

  377.     mxf_write_uuid(pb, ContentStorage, 0);

  378. 

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

  380.     put_buffer(pb, op1a_ul, 16);

  381. 

  382.     // write essence_container_refs

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

  384.     mxf_write_essence_container_refs(s);

  385. 

  386.     // write dm_scheme_refs

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

  388.     put_be64(pb, 0);

  389. }

  390. 

  391. /*

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

  393.  */

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

  395. {

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

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

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

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

  400. }

  401. 

  402. static void mxf_write_identification(AVFormatContext *s)

  403. {

  404.     ByteIOContext *pb = s->pb;

  405.     const char *company = "FFmpeg";

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

  407.     const char *version;

  408.     int length;

  409. 

  410.     mxf_write_metadata_key(pb, 0x013000);

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

  412. 

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

  414.         "0.0.0" : AV_STRINGIFY(LIBAVFORMAT_VERSION);

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

  416.     klv_encode_ber_length(pb, length);

  417. 

  418.     // write uid

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

  420.     mxf_write_uuid(pb, Identification, 0);

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

  422. 

  423.     // write generation uid

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

  425.     mxf_write_uuid(pb, Identification, 1);

  426. 

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

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

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

  430. 

  431.     // write product uid

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

  433.     mxf_write_uuid(pb, Identification, 2);

  434. 

  435.     // write modified date

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

  437.     put_be64(pb, 0);

  438. }

  439. 

  440. static void mxf_write_content_storage(AVFormatContext *s)

  441. {

  442.     ByteIOContext *pb = s->pb;

  443. 

  444.     mxf_write_metadata_key(pb, 0x011800);

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

  446.     klv_encode_ber_length(pb, 92);

  447. 

  448.     // write uid

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

  450.     mxf_write_uuid(pb, ContentStorage, 0);

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

  452. 

  453.     // write package reference

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

  455.     mxf_write_refs_count(pb, 2);

  456.     mxf_write_uuid(pb, MaterialPackage, 0);

  457.     mxf_write_uuid(pb, SourcePackage, 0);

  458. 

  459.     // write essence container data

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

  461.     mxf_write_refs_count(pb, 1);

  462.     mxf_write_uuid(pb, EssenceContainerData, 0);

  463. }

  464. 

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

  466. {

  467.     MXFContext *mxf = s->priv_data;

  468.     ByteIOContext *pb = s->pb;

  469.     MXFStreamContext *sc = st->priv_data;

  470. 

  471.     mxf_write_metadata_key(pb, 0x013b00);

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

  473.     klv_encode_ber_length(pb, 80);

  474. 

  475.     // write track uid

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

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

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

  479. 

  480.     // write track id

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

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

  483. 

  484.     // write track number

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

  486.     if (type == MaterialPackage)

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

  488.     else

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

  490. 

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

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

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

  494. 

  495.     // write origin

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

  497.     put_be64(pb, 0);

  498. 

  499.     // write sequence refs

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

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

  502. }

  503. 

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

  505. {

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

  507.     MXFStreamContext *sc = st->priv_data;

  508. 

  509.     // find data define uls

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

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

  512. 

  513.     // write duration

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

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

  516. }

  517. 

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

  519. {

  520.     ByteIOContext *pb = s->pb;

  521. 

  522.     mxf_write_metadata_key(pb, 0x010f00);

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

  524.     klv_encode_ber_length(pb, 80);

  525. 

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

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

  528. 

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

  530.     mxf_write_common_fields(pb, st);

  531. 

  532.     // write structural component

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

  534.     mxf_write_refs_count(pb, 1);

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

  536. }

  537. 

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

  539. {

  540.     ByteIOContext *pb = s->pb;

  541.     int i;

  542. 

  543.     mxf_write_metadata_key(pb, 0x011100);

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

  545.     klv_encode_ber_length(pb, 108);

  546. 

  547.     // write uid

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

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

  550. 

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

  552.     mxf_write_common_fields(pb, st);

  553. 

  554.     // write start_position

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

  556.     put_be64(pb, 0);

  557. 

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

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

  560.     if (type == SourcePackage) {

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

  562.             put_be64(pb, 0);

  563.     } else

  564.         mxf_write_umid(pb, SourcePackage, 0);

  565. 

  566.     // write source track id

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

  568.     if (type == SourcePackage)

  569.         put_be32(pb, 0);

  570.     else

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

  572. }

  573. 

  574. static void mxf_write_multi_descriptor(AVFormatContext *s)

  575. {

  576.     ByteIOContext *pb = s->pb;

  577.     int i;

  578. 

  579.     mxf_write_metadata_key(pb, 0x014400);

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

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

  582. 

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

  584.     mxf_write_uuid(pb, MultipleDescriptor, 0);

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

  586. 

  587.     // write sample rate

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

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

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

  591. 

  592.     // write essence container ul

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

  594.     put_buffer(pb, multiple_desc_ul, 16);

  595. 

  596.     // write sub descriptor refs

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

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

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

  600.         mxf_write_uuid(pb, SubDescriptor, i);

  601. }

  602. 

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

  604. {

  605.     MXFStreamContext *sc = st->priv_data;

  606. 

  607.     put_buffer(pb, key, 16);

  608.     klv_encode_ber_length(pb, size);

  609. 

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

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

  612. 

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

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

  615. 

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

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

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

  619. 

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

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

  622. }

  623. 

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

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

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

  627. 

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

  629. {

  630.     MXFStreamContext *sc = st->priv_data;

  631.     ByteIOContext *pb = s->pb;

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

  633.     AVRational dar;

  634.     int f1, f2;

  635. 

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

  637. 

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

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

  640. 

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

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

  643. 

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

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

  646. 

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

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

  649. 

  650.     // bit rate

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

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

  653. 

  654.     // frame layout

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

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

  657. 

  658.     // video line map

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

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

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

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

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

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

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

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

  667.     }

  668. 

  669.     if (!sc->interlaced) {

  670.         f2  = 0;

  671.         f1 *= 2;

  672.     }

  673. 

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

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

  676.     put_be32(pb, 4);

  677.     put_be32(pb, f1);

  678.     if (sc->interlaced)

  679.         put_be32(pb, f2);

  680. 

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

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

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

  684.               1024*1024);

  685. 

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

  687.     put_be32(pb, dar.num);

  688.     put_be32(pb, dar.den);

  689. 

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

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

  692. }

  693. 

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

  695. {

  696.     ByteIOContext *pb = s->pb;

  697. 

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

  699. 

  700.     // audio locked

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

  702.     put_byte(pb, 1);

  703. 

  704.     // write audio sampling rate

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

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

  707.     put_be32(pb, 1);

  708. 

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

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

  711. 

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

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

  714. }

  715. 

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

  717. {

  718.     ByteIOContext *pb = s->pb;

  719. 

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

  721. 

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

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

  724. 

  725.     // avg bytes per sec

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

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

  728. }

  729. 

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

  731. {

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

  733. }

  734. 

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

  736. {

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

  738. }

  739. 

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

  741. {

  742.     ByteIOContext *pb = s->pb;

  743.     int i;

  744. 

  745.     if (type == MaterialPackage) {

  746.         mxf_write_metadata_key(pb, 0x013600);

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

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

  749.     } else {

  750.         mxf_write_metadata_key(pb, 0x013700);

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

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

  753.     }

  754. 

  755.     // write uid

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

  757.     mxf_write_uuid(pb, type, 0);

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

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

  760. 

  761.     // write package umid

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

  763.     mxf_write_umid(pb, type, 0);

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

  765. 

  766.     // write create date

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

  768.     put_be64(pb, 0);

  769. 

  770.     // write modified date

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

  772.     put_be64(pb, 0);

  773. 

  774.     // write track refs

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

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

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

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

  779. 

  780.     // write multiple descriptor reference

  781.     if (type == SourcePackage) {

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

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

  784.             mxf_write_uuid(pb, MultipleDescriptor, 0);

  785.             mxf_write_multi_descriptor(s);

  786.         } else

  787.             mxf_write_uuid(pb, SubDescriptor, 0);

  788.     }

  789. 

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

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

  792.         mxf_write_track(s, st, type);

  793.         mxf_write_sequence(s, st, type);

  794.         mxf_write_structural_component(s, st, type);

  795. 

  796.         if (type == SourcePackage) {

  797.             MXFStreamContext *sc = st->priv_data;

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

  799.         }

  800.     }

  801. }

  802. 

  803. static int mxf_write_essence_container_data(AVFormatContext *s)

  804. {

  805.     ByteIOContext *pb = s->pb;

  806. 

  807.     mxf_write_metadata_key(pb, 0x012300);

  808.     klv_encode_ber_length(pb, 72);

  809. 

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

  811.     mxf_write_uuid(pb, EssenceContainerData, 0);

  812. 

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

  814.     mxf_write_umid(pb, SourcePackage, 0);

  815. 

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

  817.     put_be32(pb, 1);

  818. 

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

  820.     put_be32(pb, 2);

  821. 

  822.     return 0;

  823. }

  824. 

  825. static int mxf_write_header_metadata_sets(AVFormatContext *s)

  826. {

  827.     mxf_write_preface(s);

  828.     mxf_write_identification(s);

  829.     mxf_write_content_storage(s);

  830.     mxf_write_package(s, MaterialPackage);

  831.     mxf_write_package(s, SourcePackage);

  832.     mxf_write_essence_container_data(s);

  833.     return 0;

  834. }

  835. 

  836. static int mxf_write_index_table_segment(AVFormatContext *s)

  837. {

  838.     MXFContext *mxf = s->priv_data;

  839.     ByteIOContext *pb = s->pb;

  840.     int i, j, k, ret, key_offset = 0;

  841.     int temporal_reordering = 0;

  842. 

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

  844. 

  845.     put_buffer(pb, index_table_segment_key, 16);

  846.     ret = klv_encode_ber_length(pb, 109 + s->nb_streams*6 +

  847.                                 mxf->edit_units_count*(11+(s->nb_streams-1)*4));

  848. 

  849.     // instance id

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

  851.     mxf_write_uuid(pb, IndexTableSegment, 0);

  852. 

  853.     // index edit rate

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

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

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

  857. 

  858.     // index start position

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

  860.     put_be64(pb, 0);

  861. 

  862.     // index duration

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

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

  865. 

  866.     // edit unit byte count

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

  868.     put_be32(pb, 0);

  869. 

  870.     // index sid

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

  872.     put_be32(pb, 2);

  873. 

  874.     // body sid

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

  876.     put_be32(pb, 1);

  877. 

  878.     // slice count - 1

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

  880.     put_byte(pb, s->nb_streams-1);

  881. 

  882.     // delta entry array

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

  884.     put_be32(pb, s->nb_streams); // num of entries

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

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

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

  888.         MXFStreamContext *sc = st->priv_data;

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

  890.         if (sc->temporal_reordering)

  891.             temporal_reordering = 1;

  892.         put_byte(pb, i);

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

  894.     }

  895. 

  896.     mxf_write_local_tag(pb, 8 + mxf->edit_units_count*(11+(s->nb_streams-1)*4), 0x3F0A);

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

  898.     put_be32(pb, 11+(s->nb_streams-1)*4); // size of one entry

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

  900.         if (mxf->index_entries[i].flags & 0x40)

  901.             key_offset = 0;

  902.         if (temporal_reordering) {

  903.             int temporal_offset = 0;

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

  905.                 temporal_offset++;

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

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

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

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

  910.                             temporal_offset = 0;

  911.                         else

  912.                             temporal_offset = -temporal_offset;

  913.                     }

  914.                     break;

  915.                 }

  916.             }

  917.             put_byte(pb, temporal_offset);

  918.         } else

  919.             put_byte(pb, 0);

  920.         put_byte(pb, key_offset);

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

  922.         // stream offset

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

  924.         for (k = 0; k < s->nb_streams; k++) {

  925.             if (mxf->index_entries[i].slice_offset[k])

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

  927.         }

  928.         key_offset--;

  929.     }

  930. 

  931.     return ret;

  932. }

  933. 

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

  935.                                 int indexsid, unsigned index_byte_count,

  936.                                 const uint8_t *key, int write_metadata)

  937. {

  938.     MXFContext *mxf = s->priv_data;

  939.     ByteIOContext *pb = s->pb;

  940.     int64_t header_byte_count_offset;

  941. 

  942.     // write klv

  943.     put_buffer(pb, key, 16);

  944. 

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

  946. 

  947.     // write partition value

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

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

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

  951. 

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

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

  954. 

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

  956. 

  957.     // set offset

  958.     header_byte_count_offset = url_ftell(pb);

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

  960. 

  961.     // indexTable

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

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

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

  965. 

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

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

  968. 

  969.     // essence container

  970.     mxf_write_essence_container_refs(s);

  971. 

  972.     if (write_metadata) {

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

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

  975.         mxf_write_primer_pack(s);

  976.         mxf_write_header_metadata_sets(s);

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

  978.         // update header_byte_count

  979.         url_fseek(pb, header_byte_count_offset, SEEK_SET);

  980.         put_be64(pb, pos - start);

  981.         url_fseek(pb, pos, SEEK_SET);

  982.     }

  983. 

  984.     put_flush_packet(pb);

  985. }

  986. 

  987. static const UID mxf_mpeg2_codec_uls[] = {

  988.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x10,0x00 }, // MP-ML I-Frame

  989.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, // MP-ML Long GOP

  990.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, // 422P-ML I-Frame

  991.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, // 422P-ML Long GOP

  992.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x02,0x00 }, // MP-HL I-Frame

  993.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, // MP-HL Long GOP

  994.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, // 422P-HL I-Frame

  995.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, // 422P-HL Long GOP

  996. };

  997. 

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

  999. {

  1000.     if (avctx->profile == 4) { // Main

  1001.         if (avctx->level == 8) // Main

  1002.             return avctx->gop_size ?

  1003.                 &mxf_mpeg2_codec_uls[1] :

  1004.                 &mxf_mpeg2_codec_uls[0];

  1005.         else if (avctx->level == 4) // High

  1006.             return avctx->gop_size ?

  1007.                 &mxf_mpeg2_codec_uls[5] :

  1008.                 &mxf_mpeg2_codec_uls[4];

  1009.     } else if (avctx->profile == 0) { // 422

  1010.         if (avctx->level == 5) // Main

  1011.             return avctx->gop_size ?

  1012.                 &mxf_mpeg2_codec_uls[3] :

  1013.                 &mxf_mpeg2_codec_uls[2];

  1014.         else if (avctx->level == 2) // High

  1015.             return avctx->gop_size ?

  1016.                 &mxf_mpeg2_codec_uls[7] :

  1017.                 &mxf_mpeg2_codec_uls[6];

  1018.     }

  1019.     return NULL;

  1020. }

  1021. 

  1022. static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st, AVPacket *pkt)

  1023. {

  1024.     MXFContext *mxf = s->priv_data;

  1025.     MXFStreamContext *sc = st->priv_data;

  1026.     uint32_t c = -1;

  1027.     int i;

  1028. 

  1029.     mxf->index_entries[mxf->edit_units_count].flags = 0;

  1030. 

  1031.     for(i = 0; i < pkt->size - 4; i++) {

  1032.         c = (c<<8) + pkt->data[i];

  1033.         if (c == 0x1B5) {

  1034.             if (i + 2 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x10) { // seq ext

  1035.                 st->codec->profile = pkt->data[i+1] & 0x07;

  1036.                 st->codec->level   = pkt->data[i+2] >> 4;

  1037.             } else if (i + 5 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x80) { // pict coding ext

  1038.                 sc->interlaced = !(pkt->data[i+5] & 0x80); // progressive frame

  1039.                 break;

  1040.             }

  1041.         } else if (c == 0x1b8) { // gop

  1042.             if (i + 4 < pkt->size && pkt->data[i+4]>>6 & 0x01) // closed

  1043.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x80; // random access

  1044.         } else if (c == 0x1b3) { // seq

  1045.             mxf->index_entries[mxf->edit_units_count].flags |= 0x40;

  1046.         } else if (c == 0x100) { // pic

  1047.             int pict_type = (pkt->data[i+2]>>3) & 0x07;

  1048.             if (pict_type == 2) { // P frame

  1049.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x22;

  1050.                 st->codec->gop_size = 1;

  1051.             } else if (pict_type == 3) { // B frame

  1052.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x33;

  1053.                 sc->temporal_reordering = -1;

  1054.             } else if (!pict_type) {

  1055.                 av_log(s, AV_LOG_ERROR, "error parsing mpeg2 frame\n");

  1056.                 return 0;

  1057.             }

  1058.         }

  1059.     }

  1060.     sc->codec_ul = mxf_get_mpeg2_codec_ul(st->codec);

  1061.     return !!sc->codec_ul;

  1062. }

  1063. 

  1064. static int ff_audio_interleave_init(AVFormatContext *s,

  1065.                                     const int *samples_per_frame,

  1066.                                     AVRational time_base)

  1067. {

  1068.     int i;

  1069. 

  1070.     if (!samples_per_frame)

  1071.         return -1;

  1072. 

  1073.     for (i = 0; i < s->nb_streams; i++) {

  1074.         AVStream *st = s->streams[i];

  1075.         AudioInterleaveContext *aic = st->priv_data;

  1076. 

  1077.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1078.             aic->sample_size = (st->codec->channels *

  1079.                                 av_get_bits_per_sample(st->codec->codec_id)) / 8;

  1080.             if (!aic->sample_size) {

  1081.                 av_log(s, AV_LOG_ERROR, "could not compute sample size\n");

  1082.                 return -1;

  1083.             }

  1084.             aic->samples_per_frame = samples_per_frame;

  1085.             aic->samples = aic->samples_per_frame;

  1086.             aic->time_base = time_base;

  1087. 

  1088.             av_fifo_init(&aic->fifo, 100 * *aic->samples);

  1089.         }

  1090.     }

  1091. 

  1092.     return 0;

  1093. }

  1094. 

  1095. static void ff_audio_interleave_close(AVFormatContext *s)

  1096. {

  1097.     int i;

  1098.     for (i = 0; i < s->nb_streams; i++) {

  1099.         AVStream *st = s->streams[i];

  1100.         AudioInterleaveContext *aic = st->priv_data;

  1101. 

  1102.         if (st->codec->codec_type == CODEC_TYPE_AUDIO)

  1103.             av_fifo_free(&aic->fifo);

  1104.     }

  1105. }

  1106. 

  1107. static int mxf_write_header(AVFormatContext *s)

  1108. {

  1109.     MXFContext *mxf = s->priv_data;

  1110.     int i;

  1111.     uint8_t present[FF_ARRAY_ELEMS(mxf_essence_container_uls)] = {0};

  1112.     const int *samples_per_frame = NULL;

  1113. 

  1114.     if (s->nb_streams > 17) {

  1115.         av_log(s, AV_LOG_ERROR, "error, mxf muxer supports 17 tracks maximum\n");

  1116.         return -1;

  1117.     }

  1118. 

  1119.     for (i = 0; i < s->nb_streams; i++) {

  1120.         AVStream *st = s->streams[i];

  1121.         MXFStreamContext *sc = av_mallocz(sizeof(*sc));

  1122.         if (!sc)

  1123.             return AVERROR(ENOMEM);

  1124.         st->priv_data = sc;

  1125. 

  1126.         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

  1127.             if (fabs(av_q2d(st->codec->time_base) - 1/25.0) < 0.0001) {

  1128.                 samples_per_frame = PAL_samples_per_frame;

  1129.                 mxf->time_base = (AVRational){ 1, 25 };

  1130.             } else if (fabs(av_q2d(st->codec->time_base) - 1001/30000.0) < 0.0001) {

  1131.                 samples_per_frame = NTSC_samples_per_frame;

  1132.                 mxf->time_base = (AVRational){ 1001, 30000 };

  1133.             } else {

  1134.                 av_log(s, AV_LOG_ERROR, "unsupported video frame rate\n");

  1135.                 return -1;

  1136.             }

  1137.             mxf->edit_unit_start = st->index;

  1138.             av_set_pts_info(st, 64, mxf->time_base.num, mxf->time_base.den);

  1139.         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1140.             if (st->codec->sample_rate != 48000) {

  1141.                 av_log(s, AV_LOG_ERROR, "only 48khz is implemented\n");

  1142.                 return -1;

  1143.             }

  1144.             av_set_pts_info(st, 64, 1, st->codec->sample_rate);

  1145.         }

  1146.         sc->duration = -1;

  1147. 

  1148.         sc->index = mxf_get_essence_container_ul_index(st->codec->codec_id);

  1149.         if (sc->index == -1) {

  1150.             av_log(s, AV_LOG_ERROR, "track %d: could not find essence container ul, "

  1151.                    "codec not currently supported in container\n", i);

  1152.             return -1;

  1153.         }

  1154. 

  1155.         sc->codec_ul = &mxf_essence_container_uls[sc->index].codec_ul;

  1156. 

  1157.         if (!present[sc->index]) {

  1158.             mxf->essence_containers_indices[mxf->essence_container_count++] = sc->index;

  1159.             present[sc->index] = 1;

  1160.         } else

  1161.             present[sc->index]++;

  1162.         memcpy(sc->track_essence_element_key, mxf_essence_container_uls[sc->index].element_ul, 15);

  1163.         sc->track_essence_element_key[15] = present[sc->index];

  1164.         PRINT_KEY(s, "track essence element key", sc->track_essence_element_key);

  1165.     }

  1166. 

  1167.     for (i = 0; i < s->nb_streams; i++) {

  1168.         MXFStreamContext *sc = s->streams[i]->priv_data;

  1169.         // update element count

  1170.         sc->track_essence_element_key[13] = present[sc->index];

  1171.         sc->order = AV_RB32(sc->track_essence_element_key+12);

  1172.     }

  1173. 

  1174.     if (!samples_per_frame)

  1175.         samples_per_frame = PAL_samples_per_frame;

  1176. 

  1177.     if (ff_audio_interleave_init(s, samples_per_frame, mxf->time_base) < 0)

  1178.         return -1;

  1179. 

  1180.     return 0;

  1181. }

  1182. 

  1183. static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)

  1184. {

  1185.     MXFContext *mxf = s->priv_data;

  1186.     ByteIOContext *pb = s->pb;

  1187.     AVStream *st = s->streams[pkt->stream_index];

  1188.     MXFStreamContext *sc = st->priv_data;

  1189. 

  1190.     if (!(mxf->edit_units_count % MXF_INDEX_CLUSTER_SIZE)) {

  1191.         mxf->index_entries = av_realloc(mxf->index_entries,

  1192.             (mxf->edit_units_count + MXF_INDEX_CLUSTER_SIZE)*

  1193.              sizeof(*mxf->index_entries));

  1194.         if (!mxf->index_entries) {

  1195.             av_log(s, AV_LOG_ERROR, "could not allocate index entries\n");

  1196.             return -1;

  1197.         }

  1198.     }

  1199. 

  1200.     if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {

  1201.         if (!mxf_parse_mpeg2_frame(s, st, pkt)) {

  1202.             av_log(s, AV_LOG_ERROR, "could not get mpeg2 profile and level\n");

  1203.             return -1;

  1204.         }

  1205.     }

  1206. 

  1207.     if (!mxf->header_written) {

  1208.         mxf_write_partition(s, 1, 0, 0, header_open_partition_key, 1);

  1209.         mxf->header_written = 1;

  1210.     }

  1211. 

  1212.     if (st->index == mxf->edit_unit_start) {

  1213.         mxf->index_entries[mxf->edit_units_count].offset = url_ftell(pb);

  1214.         mxf->index_entries[mxf->edit_units_count].slice_offset[st->index] = 0;

  1215.         mxf->edit_units_count++;

  1216.     } else {

  1217.         mxf->index_entries[mxf->edit_units_count-1].slice_offset[st->index] =

  1218.             url_ftell(pb) - mxf->index_entries[mxf->edit_units_count-1].offset;

  1219.     }

  1220. 

  1221.     put_buffer(pb, sc->track_essence_element_key, 16); // write key

  1222.     klv_encode_ber_length(pb, pkt->size); // write length

  1223.     put_buffer(pb, pkt->data, pkt->size); // write value

  1224. 

  1225.     sc->duration = FFMAX(pkt->pts + pkt->duration, sc->duration);

  1226. 

  1227.     put_flush_packet(pb);

  1228.     return 0;

  1229. }

  1230. 

  1231. static void mxf_write_random_index_pack(AVFormatContext *s)

  1232. {

  1233.     MXFContext *mxf = s->priv_data;

  1234.     ByteIOContext *pb = s->pb;

  1235.     uint64_t pos = url_ftell(pb);

  1236. 

  1237.     put_buffer(pb, random_index_pack_key, 16);

  1238.     klv_encode_ber_length(pb, 28);

  1239. 

  1240.     put_be32(pb, 1); // BodySID of header partition

  1241.     put_be64(pb, 0); // offset of header partition

  1242. 

  1243.     put_be32(pb, 0); // BodySID of footer partition

  1244.     put_be64(pb, mxf->footer_partition_offset);

  1245. 

  1246.     put_be32(pb, url_ftell(pb) - pos + 4);

  1247. }

  1248. 

  1249. static int mxf_write_footer(AVFormatContext *s)

  1250. {

  1251.     MXFContext *mxf = s->priv_data;

  1252.     ByteIOContext *pb = s->pb;

  1253.     unsigned index_byte_count =

  1254.         109 + s->nb_streams*6 +

  1255.         mxf->edit_units_count*(11+(s->nb_streams-1)*4);

  1256. 

  1257.     // add encoded ber length

  1258.     index_byte_count += 16 +

  1259.         (index_byte_count < 128 ? 1 : (av_log2(index_byte_count) >> 3) + 2);

  1260. 

  1261.     mxf->footer_partition_offset = url_ftell(pb);

  1262.     mxf_write_partition(s, 0, 2, index_byte_count, footer_partition_key, 0);

  1263. 

  1264.     mxf_write_index_table_segment(s);

  1265. 

  1266.     mxf_write_random_index_pack(s);

  1267. 

  1268.     if (!url_is_streamed(s->pb)) {

  1269.         url_fseek(pb, 0, SEEK_SET);

  1270.         mxf_write_partition(s, 1, 0, 0, header_closed_partition_key, 1);

  1271.     }

  1272. 

  1273.     ff_audio_interleave_close(s);

  1274. 

  1275.     mxf_free(s);

  1276.     return 0;

  1277. }

  1278. 

  1279. static int mxf_interleave_new_audio_packet(AVFormatContext *s, AVPacket *pkt,

  1280.                                            int stream_index, int flush)

  1281. {

  1282.     AVStream *st = s->streams[stream_index];

  1283.     AudioInterleaveContext *aic = st->priv_data;

  1284. 

  1285.     int size = FFMIN(av_fifo_size(&aic->fifo), *aic->samples * aic->sample_size);

  1286.     if (!size || (!flush && size == av_fifo_size(&aic->fifo)))

  1287.         return 0;

  1288. 

  1289.     av_new_packet(pkt, size);

  1290.     av_fifo_read(&aic->fifo, pkt->data, size);

  1291. 

  1292.     pkt->dts = pkt->pts = aic->dts;

  1293.     pkt->duration = av_rescale_q(*aic->samples, st->time_base, aic->time_base);

  1294.     pkt->stream_index = stream_index;

  1295.     aic->dts += pkt->duration;

  1296. 

  1297.     aic->samples++;

  1298.     if (!*aic->samples)

  1299.         aic->samples = aic->samples_per_frame;

  1300. 

  1301.     return size;

  1302. }

  1303. 

  1304. static int mxf_interleave_get_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

  1305. {

  1306.     AVPacketList *pktl;

  1307.     int stream_count = 0;

  1308.     int streams[MAX_STREAMS];

  1309. 

  1310.     memset(streams, 0, sizeof(streams));

  1311.     pktl = s->packet_buffer;

  1312.     while (pktl) {

  1313.         //av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);

  1314.         if (!streams[pktl->pkt.stream_index])

  1315.             stream_count++;

  1316.         streams[pktl->pkt.stream_index]++;

  1317.         pktl = pktl->next;

  1318.     }

  1319. 

  1320.     if (stream_count && (s->nb_streams == stream_count || flush)) {

  1321.         pktl = s->packet_buffer;

  1322.         if (s->nb_streams != stream_count) {

  1323.             MXFContext *mxf = s->priv_data;

  1324.             AVPacketList *first = NULL;

  1325.             // find first packet in edit unit

  1326.             while (pktl) {

  1327.                 AVStream *st = s->streams[pktl->pkt.stream_index];

  1328.                 if (st->index == mxf->edit_unit_start)

  1329.                     break;

  1330.                 else if (!first)

  1331.                     first = pktl;

  1332.                 pktl = pktl->next;

  1333.             }

  1334.             // purge packet queue

  1335.             while (pktl) {

  1336.                 AVPacketList *next = pktl->next;

  1337.                 av_free_packet(&pktl->pkt);

  1338.                 av_freep(&pktl);

  1339.                 pktl = next;

  1340.             }

  1341.             if (!first)

  1342.                 goto out;

  1343.             pktl = first;

  1344.         }

  1345. 

  1346.         *out = pktl->pkt;

  1347.         //av_log(s, AV_LOG_DEBUG, "out st:%d dts:%lld\n", (*out).stream_index, (*out).dts);

  1348.         s->packet_buffer = pktl->next;

  1349.         av_freep(&pktl);

  1350.         return 1;

  1351.     } else {

  1352.     out:

  1353.         av_init_packet(out);

  1354.         return 0;

  1355.     }

  1356. }

  1357. 

  1358. static int mxf_compare_timestamps(AVFormatContext *s, AVPacket *next, AVPacket *pkt)

  1359. {

  1360.     MXFStreamContext *sc  = s->streams[pkt ->stream_index]->priv_data;

  1361.     MXFStreamContext *sc2 = s->streams[next->stream_index]->priv_data;

  1362. 

  1363.     return next->dts > pkt->dts ||

  1364.         (next->dts == pkt->dts && sc->order < sc2->order);

  1365. }

  1366. 

  1367. static int mxf_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

  1368. {

  1369.     int i;

  1370. 

  1371.     if (pkt) {

  1372.         AVStream *st = s->streams[pkt->stream_index];

  1373.         AudioInterleaveContext *aic = st->priv_data;

  1374.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1375.             av_fifo_generic_write(&aic->fifo, pkt->data, pkt->size, NULL);

  1376.         } else {

  1377.             // rewrite pts and dts to be decoded time line position

  1378.             pkt->pts = pkt->dts = aic->dts;

  1379.             aic->dts += pkt->duration;

  1380.             ff_interleave_add_packet(s, pkt, mxf_compare_timestamps);

  1381.         }

  1382.         pkt = NULL;

  1383.     }

  1384. 

  1385.     for (i = 0; i < s->nb_streams; i++) {

  1386.         AVStream *st = s->streams[i];

  1387.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1388.             AVPacket new_pkt;

  1389.             while (mxf_interleave_new_audio_packet(s, &new_pkt, i, flush))

  1390.                 ff_interleave_add_packet(s, &new_pkt, mxf_compare_timestamps);

  1391.         }

  1392.     }

  1393. 

  1394.     return mxf_interleave_get_packet(s, out, pkt, flush);

  1395. }

  1396. 

  1397. AVOutputFormat mxf_muxer = {

  1398.     "mxf",

  1399.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1400.     NULL,

  1401.     "mxf",

  1402.     sizeof(MXFContext),

  1403.     CODEC_ID_PCM_S16LE,

  1404.     CODEC_ID_MPEG2VIDEO,

  1405.     mxf_write_header,

  1406.     mxf_write_packet,

  1407.     mxf_write_footer,

  1408.     AVFMT_NOTIMESTAMPS,

  1409.     NULL,

  1410.     mxf_interleave,

  1411. };