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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.     MXFContext *mxf = s->priv_data;

  577.     ByteIOContext *pb = s->pb;

  578.     int i;

  579. 

  580.     mxf_write_metadata_key(pb, 0x014400);

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

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

  583. 

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

  585.     mxf_write_uuid(pb, MultipleDescriptor, 0);

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

  587. 

  588.     // write sample rate

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

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

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

  592. 

  593.     // write essence container ul

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

  595.     put_buffer(pb, multiple_desc_ul, 16);

  596. 

  597.     // write sub descriptor refs

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

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

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

  601.         mxf_write_uuid(pb, SubDescriptor, i);

  602. }

  603. 

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

  605. {

  606.     MXFContext *mxf = s->priv_data;

  607.     MXFStreamContext *sc = st->priv_data;

  608.     ByteIOContext *pb = s->pb;

  609. 

  610.     put_buffer(pb, key, 16);

  611.     klv_encode_ber_length(pb, size);

  612. 

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

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

  615. 

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

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

  618. 

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

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

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

  622. 

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

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

  625. }

  626. 

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

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

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

  630. 

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

  632. {

  633.     MXFStreamContext *sc = st->priv_data;

  634.     ByteIOContext *pb = s->pb;

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

  636.     AVRational dar;

  637.     int f1, f2;

  638. 

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

  640. 

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

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

  643. 

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

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

  646. 

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

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

  649. 

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

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

  652. 

  653.     // bit rate

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

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

  656. 

  657.     // frame layout

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

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

  660. 

  661.     // video line map

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

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

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

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

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

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

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

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

  670.     }

  671. 

  672.     if (!sc->interlaced) {

  673.         f2  = 0;

  674.         f1 *= 2;

  675.     }

  676. 

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

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

  679.     put_be32(pb, 4);

  680.     put_be32(pb, f1);

  681.     if (sc->interlaced)

  682.         put_be32(pb, f2);

  683. 

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

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

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

  687.               1024*1024);

  688. 

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

  690.     put_be32(pb, dar.num);

  691.     put_be32(pb, dar.den);

  692. 

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

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

  695. }

  696. 

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

  698. {

  699.     ByteIOContext *pb = s->pb;

  700. 

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

  702. 

  703.     // audio locked

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

  705.     put_byte(pb, 1);

  706. 

  707.     // write audio sampling rate

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

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

  710.     put_be32(pb, 1);

  711. 

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

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

  714. 

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

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

  717. }

  718. 

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

  720. {

  721.     ByteIOContext *pb = s->pb;

  722. 

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

  724. 

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

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

  727. 

  728.     // avg bytes per sec

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

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

  731. }

  732. 

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

  734. {

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

  736. }

  737. 

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

  739. {

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

  741. }

  742. 

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

  744. {

  745.     ByteIOContext *pb = s->pb;

  746.     int i;

  747. 

  748.     if (type == MaterialPackage) {

  749.         mxf_write_metadata_key(pb, 0x013600);

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

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

  752.     } else {

  753.         mxf_write_metadata_key(pb, 0x013700);

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

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

  756.     }

  757. 

  758.     // write uid

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

  760.     mxf_write_uuid(pb, type, 0);

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

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

  763. 

  764.     // write package umid

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

  766.     mxf_write_umid(pb, type, 0);

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

  768. 

  769.     // write create date

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

  771.     put_be64(pb, 0);

  772. 

  773.     // write modified date

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

  775.     put_be64(pb, 0);

  776. 

  777.     // write track refs

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

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

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

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

  782. 

  783.     // write multiple descriptor reference

  784.     if (type == SourcePackage) {

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

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

  787.             mxf_write_uuid(pb, MultipleDescriptor, 0);

  788.             mxf_write_multi_descriptor(s);

  789.         } else

  790.             mxf_write_uuid(pb, SubDescriptor, 0);

  791.     }

  792. 

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

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

  795.         mxf_write_track(s, st, type);

  796.         mxf_write_sequence(s, st, type);

  797.         mxf_write_structural_component(s, st, type);

  798. 

  799.         if (type == SourcePackage) {

  800.             MXFStreamContext *sc = st->priv_data;

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

  802.         }

  803.     }

  804. }

  805. 

  806. static int mxf_write_essence_container_data(AVFormatContext *s)

  807. {

  808.     ByteIOContext *pb = s->pb;

  809. 

  810.     mxf_write_metadata_key(pb, 0x012300);

  811.     klv_encode_ber_length(pb, 72);

  812. 

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

  814.     mxf_write_uuid(pb, EssenceContainerData, 0);

  815. 

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

  817.     mxf_write_umid(pb, SourcePackage, 0);

  818. 

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

  820.     put_be32(pb, 1);

  821. 

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

  823.     put_be32(pb, 2);

  824. 

  825.     return 0;

  826. }

  827. 

  828. static int mxf_write_header_metadata_sets(AVFormatContext *s)

  829. {

  830.     mxf_write_preface(s);

  831.     mxf_write_identification(s);

  832.     mxf_write_content_storage(s);

  833.     mxf_write_package(s, MaterialPackage);

  834.     mxf_write_package(s, SourcePackage);

  835.     mxf_write_essence_container_data(s);

  836.     return 0;

  837. }

  838. 

  839. static int mxf_write_index_table_segment(AVFormatContext *s)

  840. {

  841.     MXFContext *mxf = s->priv_data;

  842.     ByteIOContext *pb = s->pb;

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

  844.     int temporal_reordering = 0;

  845. 

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

  847. 

  848.     put_buffer(pb, index_table_segment_key, 16);

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

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

  851. 

  852.     // instance id

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

  854.     mxf_write_uuid(pb, IndexTableSegment, 0);

  855. 

  856.     // index edit rate

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

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

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

  860. 

  861.     // index start position

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

  863.     put_be64(pb, 0);

  864. 

  865.     // index duration

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

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

  868. 

  869.     // edit unit byte count

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

  871.     put_be32(pb, 0);

  872. 

  873.     // index sid

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

  875.     put_be32(pb, 2);

  876. 

  877.     // body sid

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

  879.     put_be32(pb, 1);

  880. 

  881.     // slice count - 1

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

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

  884. 

  885.     // delta entry array

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

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

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

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

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

  891.         MXFStreamContext *sc = st->priv_data;

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

  893.         if (sc->temporal_reordering)

  894.             temporal_reordering = 1;

  895.         put_byte(pb, i);

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

  897.     }

  898. 

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

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

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

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

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

  904.             key_offset = 0;

  905.         if (temporal_reordering) {

  906.             int temporal_offset = 0;

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

  908.                 temporal_offset++;

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

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

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

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

  913.                             temporal_offset = 0;

  914.                         else

  915.                             temporal_offset = -temporal_offset;

  916.                     }

  917.                     break;

  918.                 }

  919.             }

  920.             put_byte(pb, temporal_offset);

  921.         } else

  922.             put_byte(pb, 0);

  923.         put_byte(pb, key_offset);

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

  925.         // stream offset

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

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

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

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

  930.         }

  931.         key_offset--;

  932.     }

  933. 

  934.     return ret;

  935. }

  936. 

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

  938.                                 int indexsid, unsigned index_byte_count,

  939.                                 const uint8_t *key, int write_metadata)

  940. {

  941.     MXFContext *mxf = s->priv_data;

  942.     ByteIOContext *pb = s->pb;

  943.     int64_t header_byte_count_offset;

  944. 

  945.     // write klv

  946.     put_buffer(pb, key, 16);

  947. 

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

  949. 

  950.     // write partition value

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

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

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

  954. 

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

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

  957. 

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

  959. 

  960.     // set offset

  961.     header_byte_count_offset = url_ftell(pb);

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

  963. 

  964.     // indexTable

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

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

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

  968. 

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

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

  971. 

  972.     // essence container

  973.     mxf_write_essence_container_refs(s);

  974. 

  975.     if (write_metadata) {

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

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

  978.         mxf_write_primer_pack(s);

  979.         mxf_write_header_metadata_sets(s);

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

  981.         // update header_byte_count

  982.         url_fseek(pb, header_byte_count_offset, SEEK_SET);

  983.         put_be64(pb, pos - start);

  984.         url_fseek(pb, pos, SEEK_SET);

  985.     }

  986. 

  987.     put_flush_packet(pb);

  988. }

  989. 

  990. static const UID mxf_mpeg2_codec_uls[] = {

  991.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x10,0x00 }, // MP-ML I-Frame

  992.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, // MP-ML Long GOP

  993.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, // 422P-ML I-Frame

  994.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, // 422P-ML Long GOP

  995.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x02,0x00 }, // MP-HL I-Frame

  996.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, // MP-HL Long GOP

  997.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, // 422P-HL I-Frame

  998.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, // 422P-HL Long GOP

  999. };

  1000. 

  1001. static const UID *mxf_get_mpeg2_codec_ul(AVCodecContext *avctx)

  1002. {

  1003.     if (avctx->profile == 4) { // Main

  1004.         if (avctx->level == 8) // Main

  1005.             return avctx->gop_size ?

  1006.                 &mxf_mpeg2_codec_uls[1] :

  1007.                 &mxf_mpeg2_codec_uls[0];

  1008.         else if (avctx->level == 4) // High

  1009.             return avctx->gop_size ?

  1010.                 &mxf_mpeg2_codec_uls[5] :

  1011.                 &mxf_mpeg2_codec_uls[4];

  1012.     } else if (avctx->profile == 0) { // 422

  1013.         if (avctx->level == 5) // Main

  1014.             return avctx->gop_size ?

  1015.                 &mxf_mpeg2_codec_uls[3] :

  1016.                 &mxf_mpeg2_codec_uls[2];

  1017.         else if (avctx->level == 2) // High

  1018.             return avctx->gop_size ?

  1019.                 &mxf_mpeg2_codec_uls[7] :

  1020.                 &mxf_mpeg2_codec_uls[6];

  1021.     }

  1022.     return NULL;

  1023. }

  1024. 

  1025. static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st, AVPacket *pkt)

  1026. {

  1027.     MXFContext *mxf = s->priv_data;

  1028.     MXFStreamContext *sc = st->priv_data;

  1029.     uint32_t c = -1;

  1030.     int i;

  1031. 

  1032.     mxf->index_entries[mxf->edit_units_count].flags = 0;

  1033. 

  1034.     for(i = 0; i < pkt->size - 4; i++) {

  1035.         c = (c<<8) + pkt->data[i];

  1036.         if (c == 0x1B5) {

  1037.             if (i + 2 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x10) { // seq ext

  1038.                 st->codec->profile = pkt->data[i+1] & 0x07;

  1039.                 st->codec->level   = pkt->data[i+2] >> 4;

  1040.             } else if (i + 5 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x80) { // pict coding ext

  1041.                 sc->interlaced = !(pkt->data[i+5] & 0x80); // progressive frame

  1042.                 break;

  1043.             }

  1044.         } else if (c == 0x1b8) { // gop

  1045.             if (i + 4 < pkt->size && pkt->data[i+4]>>6 & 0x01) // closed

  1046.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x80; // random access

  1047.         } else if (c == 0x1b3) { // seq

  1048.             mxf->index_entries[mxf->edit_units_count].flags |= 0x40;

  1049.         } else if (c == 0x100) { // pic

  1050.             int pict_type = (pkt->data[i+2]>>3) & 0x07;

  1051.             if (pict_type == 2) { // P frame

  1052.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x22;

  1053.                 st->codec->gop_size = 1;

  1054.             } else if (pict_type == 3) { // B frame

  1055.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x33;

  1056.                 sc->temporal_reordering = -1;

  1057.             } else if (!pict_type) {

  1058.                 av_log(s, AV_LOG_ERROR, "error parsing mpeg2 frame\n");

  1059.                 return 0;

  1060.             }

  1061.         }

  1062.     }

  1063.     sc->codec_ul = mxf_get_mpeg2_codec_ul(st->codec);

  1064.     return !!sc->codec_ul;

  1065. }

  1066. 

  1067. static int ff_audio_interleave_init(AVFormatContext *s,

  1068.                                     const int *samples_per_frame,

  1069.                                     AVRational time_base)

  1070. {

  1071.     int i;

  1072. 

  1073.     if (!samples_per_frame)

  1074.         return -1;

  1075. 

  1076.     for (i = 0; i < s->nb_streams; i++) {

  1077.         AVStream *st = s->streams[i];

  1078.         AudioInterleaveContext *aic = st->priv_data;

  1079. 

  1080.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1081.             aic->sample_size = (st->codec->channels *

  1082.                                 av_get_bits_per_sample(st->codec->codec_id)) / 8;

  1083.             if (!aic->sample_size) {

  1084.                 av_log(s, AV_LOG_ERROR, "could not compute sample size\n");

  1085.                 return -1;

  1086.             }

  1087.             aic->samples_per_frame = samples_per_frame;

  1088.             aic->samples = aic->samples_per_frame;

  1089.             aic->time_base = time_base;

  1090. 

  1091.             av_fifo_init(&aic->fifo, 100 * *aic->samples);

  1092.         }

  1093.     }

  1094. 

  1095.     return 0;

  1096. }

  1097. 

  1098. static void ff_audio_interleave_close(AVFormatContext *s)

  1099. {

  1100.     int i;

  1101.     for (i = 0; i < s->nb_streams; i++) {

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

  1103.         AudioInterleaveContext *aic = st->priv_data;

  1104. 

  1105.         if (st->codec->codec_type == CODEC_TYPE_AUDIO)

  1106.             av_fifo_free(&aic->fifo);

  1107.     }

  1108. }

  1109. 

  1110. static int mxf_write_header(AVFormatContext *s)

  1111. {

  1112.     MXFContext *mxf = s->priv_data;

  1113.     int i;

  1114.     uint8_t present[FF_ARRAY_ELEMS(mxf_essence_container_uls)] = {0};

  1115.     const int *samples_per_frame = NULL;

  1116. 

  1117.     if (s->nb_streams > 17) {

  1118.         av_log(s, AV_LOG_ERROR, "error, mxf muxer supports 17 tracks maximum\n");

  1119.         return -1;

  1120.     }

  1121. 

  1122.     for (i = 0; i < s->nb_streams; i++) {

  1123.         AVStream *st = s->streams[i];

  1124.         MXFStreamContext *sc = av_mallocz(sizeof(*sc));

  1125.         if (!sc)

  1126.             return AVERROR(ENOMEM);

  1127.         st->priv_data = sc;

  1128. 

  1129.         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

  1130.             if (fabs(av_q2d(st->codec->time_base) - 1/25.0) < 0.0001) {

  1131.                 samples_per_frame = PAL_samples_per_frame;

  1132.                 mxf->time_base = (AVRational){ 1, 25 };

  1133.             } else if (fabs(av_q2d(st->codec->time_base) - 1001/30000.0) < 0.0001) {

  1134.                 samples_per_frame = NTSC_samples_per_frame;

  1135.                 mxf->time_base = (AVRational){ 1001, 30000 };

  1136.             } else {

  1137.                 av_log(s, AV_LOG_ERROR, "unsupported video frame rate\n");

  1138.                 return -1;

  1139.             }

  1140.             mxf->edit_unit_start = st->index;

  1141.             av_set_pts_info(st, 64, mxf->time_base.num, mxf->time_base.den);

  1142.         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1143.             if (st->codec->sample_rate != 48000) {

  1144.                 av_log(s, AV_LOG_ERROR, "only 48khz is implemented\n");

  1145.                 return -1;

  1146.             }

  1147.             av_set_pts_info(st, 64, 1, st->codec->sample_rate);

  1148.         }

  1149.         sc->duration = -1;

  1150. 

  1151.         sc->index = mxf_get_essence_container_ul_index(st->codec->codec_id);

  1152.         if (sc->index == -1) {

  1153.             av_log(s, AV_LOG_ERROR, "track %d: could not find essence container ul, "

  1154.                    "codec not currently supported in container\n", i);

  1155.             return -1;

  1156.         }

  1157. 

  1158.         sc->codec_ul = &mxf_essence_container_uls[sc->index].codec_ul;

  1159. 

  1160.         if (!present[sc->index]) {

  1161.             mxf->essence_containers_indices[mxf->essence_container_count++] = sc->index;

  1162.             present[sc->index] = 1;

  1163.         } else

  1164.             present[sc->index]++;

  1165.         memcpy(sc->track_essence_element_key, mxf_essence_container_uls[sc->index].element_ul, 15);

  1166.         sc->track_essence_element_key[15] = present[sc->index];

  1167.         PRINT_KEY(s, "track essence element key", sc->track_essence_element_key);

  1168.     }

  1169. 

  1170.     for (i = 0; i < s->nb_streams; i++) {

  1171.         MXFStreamContext *sc = s->streams[i]->priv_data;

  1172.         // update element count

  1173.         sc->track_essence_element_key[13] = present[sc->index];

  1174.         sc->order = AV_RB32(sc->track_essence_element_key+12);

  1175.     }

  1176. 

  1177.     if (!samples_per_frame)

  1178.         samples_per_frame = PAL_samples_per_frame;

  1179. 

  1180.     if (ff_audio_interleave_init(s, samples_per_frame, mxf->time_base) < 0)

  1181.         return -1;

  1182. 

  1183.     return 0;

  1184. }

  1185. 

  1186. static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)

  1187. {

  1188.     MXFContext *mxf = s->priv_data;

  1189.     ByteIOContext *pb = s->pb;

  1190.     AVStream *st = s->streams[pkt->stream_index];

  1191.     MXFStreamContext *sc = st->priv_data;

  1192. 

  1193.     if (!(mxf->edit_units_count % MXF_INDEX_CLUSTER_SIZE)) {

  1194.         mxf->index_entries = av_realloc(mxf->index_entries,

  1195.             (mxf->edit_units_count + MXF_INDEX_CLUSTER_SIZE)*

  1196.              sizeof(*mxf->index_entries));

  1197.         if (!mxf->index_entries) {

  1198.             av_log(s, AV_LOG_ERROR, "could not allocate index entries\n");

  1199.             return -1;

  1200.         }

  1201.     }

  1202. 

  1203.     if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {

  1204.         if (!mxf_parse_mpeg2_frame(s, st, pkt)) {

  1205.             av_log(s, AV_LOG_ERROR, "could not get mpeg2 profile and level\n");

  1206.             return -1;

  1207.         }

  1208.     }

  1209. 

  1210.     if (!mxf->header_written) {

  1211.         mxf_write_partition(s, 1, 0, 0, header_open_partition_key, 1);

  1212.         mxf->header_written = 1;

  1213.     }

  1214. 

  1215.     if (st->index == mxf->edit_unit_start) {

  1216.         mxf->index_entries[mxf->edit_units_count].offset = url_ftell(pb);

  1217.         mxf->index_entries[mxf->edit_units_count].slice_offset[st->index] = 0;

  1218.         mxf->edit_units_count++;

  1219.     } else {

  1220.         mxf->index_entries[mxf->edit_units_count-1].slice_offset[st->index] =

  1221.             url_ftell(pb) - mxf->index_entries[mxf->edit_units_count-1].offset;

  1222.     }

  1223. 

  1224.     put_buffer(pb, sc->track_essence_element_key, 16); // write key

  1225.     klv_encode_ber_length(pb, pkt->size); // write length

  1226.     put_buffer(pb, pkt->data, pkt->size); // write value

  1227. 

  1228.     sc->duration = FFMAX(pkt->pts + pkt->duration, sc->duration);

  1229. 

  1230.     put_flush_packet(pb);

  1231.     return 0;

  1232. }

  1233. 

  1234. static void mxf_write_random_index_pack(AVFormatContext *s)

  1235. {

  1236.     MXFContext *mxf = s->priv_data;

  1237.     ByteIOContext *pb = s->pb;

  1238.     uint64_t pos = url_ftell(pb);

  1239. 

  1240.     put_buffer(pb, random_index_pack_key, 16);

  1241.     klv_encode_ber_length(pb, 28);

  1242. 

  1243.     put_be32(pb, 1); // BodySID of header partition

  1244.     put_be64(pb, 0); // offset of header partition

  1245. 

  1246.     put_be32(pb, 0); // BodySID of footer partition

  1247.     put_be64(pb, mxf->footer_partition_offset);

  1248. 

  1249.     put_be32(pb, url_ftell(pb) - pos + 4);

  1250. }

  1251. 

  1252. static int mxf_write_footer(AVFormatContext *s)

  1253. {

  1254.     MXFContext *mxf = s->priv_data;

  1255.     ByteIOContext *pb = s->pb;

  1256.     unsigned index_byte_count =

  1257.         109 + s->nb_streams*6 +

  1258.         mxf->edit_units_count*(11+(s->nb_streams-1)*4);

  1259. 

  1260.     // add encoded ber length

  1261.     index_byte_count += 16 +

  1262.         (index_byte_count < 128 ? 1 : (av_log2(index_byte_count) >> 3) + 2);

  1263. 

  1264.     mxf->footer_partition_offset = url_ftell(pb);

  1265.     mxf_write_partition(s, 0, 2, index_byte_count, footer_partition_key, 0);

  1266. 

  1267.     mxf_write_index_table_segment(s);

  1268. 

  1269.     mxf_write_random_index_pack(s);

  1270. 

  1271.     if (!url_is_streamed(s->pb)) {

  1272.         url_fseek(pb, 0, SEEK_SET);

  1273.         mxf_write_partition(s, 1, 0, 0, header_closed_partition_key, 1);

  1274.     }

  1275. 

  1276.     ff_audio_interleave_close(s);

  1277. 

  1278.     mxf_free(s);

  1279.     return 0;

  1280. }

  1281. 

  1282. static int mxf_interleave_new_audio_packet(AVFormatContext *s, AVPacket *pkt,

  1283.                                            int stream_index, int flush)

  1284. {

  1285.     AVStream *st = s->streams[stream_index];

  1286.     AudioInterleaveContext *aic = st->priv_data;

  1287. 

  1288.     int size = FFMIN(av_fifo_size(&aic->fifo), *aic->samples * aic->sample_size);

  1289.     if (!size || (!flush && size == av_fifo_size(&aic->fifo)))

  1290.         return 0;

  1291. 

  1292.     av_new_packet(pkt, size);

  1293.     av_fifo_read(&aic->fifo, pkt->data, size);

  1294. 

  1295.     pkt->dts = pkt->pts = aic->dts;

  1296.     pkt->duration = av_rescale_q(*aic->samples, st->time_base, aic->time_base);

  1297.     pkt->stream_index = stream_index;

  1298.     aic->dts += pkt->duration;

  1299. 

  1300.     aic->samples++;

  1301.     if (!*aic->samples)

  1302.         aic->samples = aic->samples_per_frame;

  1303. 

  1304.     return size;

  1305. }

  1306. 

  1307. static int mxf_interleave_get_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

  1308. {

  1309.     AVPacketList *pktl;

  1310.     int stream_count = 0;

  1311.     int streams[MAX_STREAMS];

  1312. 

  1313.     memset(streams, 0, sizeof(streams));

  1314.     pktl = s->packet_buffer;

  1315.     while (pktl) {

  1316.         //av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);

  1317.         if (!streams[pktl->pkt.stream_index])

  1318.             stream_count++;

  1319.         streams[pktl->pkt.stream_index]++;

  1320.         pktl = pktl->next;

  1321.     }

  1322. 

  1323.     if (stream_count && (s->nb_streams == stream_count || flush)) {

  1324.         pktl = s->packet_buffer;

  1325.         if (s->nb_streams != stream_count) {

  1326.             MXFContext *mxf = s->priv_data;

  1327.             AVPacketList *first = NULL;

  1328.             // find first packet in edit unit

  1329.             while (pktl) {

  1330.                 AVStream *st = s->streams[pktl->pkt.stream_index];

  1331.                 if (st->index == mxf->edit_unit_start)

  1332.                     break;

  1333.                 else if (!first)

  1334.                     first = pktl;

  1335.                 pktl = pktl->next;

  1336.             }

  1337.             // purge packet queue

  1338.             while (pktl) {

  1339.                 AVPacketList *next = pktl->next;

  1340.                 av_free_packet(&pktl->pkt);

  1341.                 av_freep(&pktl);

  1342.                 pktl = next;

  1343.             }

  1344.             if (!first)

  1345.                 goto out;

  1346.             pktl = first;

  1347.         }

  1348. 

  1349.         *out = pktl->pkt;

  1350.         //av_log(s, AV_LOG_DEBUG, "out st:%d dts:%lld\n", (*out).stream_index, (*out).dts);

  1351.         s->packet_buffer = pktl->next;

  1352.         av_freep(&pktl);

  1353.         return 1;

  1354.     } else {

  1355.     out:

  1356.         av_init_packet(out);

  1357.         return 0;

  1358.     }

  1359. }

  1360. 

  1361. static int mxf_compare_timestamps(AVFormatContext *s, AVPacket *next, AVPacket *pkt)

  1362. {

  1363.     MXFStreamContext *sc  = s->streams[pkt ->stream_index]->priv_data;

  1364.     MXFStreamContext *sc2 = s->streams[next->stream_index]->priv_data;

  1365. 

  1366.     return next->dts > pkt->dts ||

  1367.         (next->dts == pkt->dts && sc->order < sc2->order);

  1368. }

  1369. 

  1370. static int mxf_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

  1371. {

  1372.     int i;

  1373. 

  1374.     if (pkt) {

  1375.         AVStream *st = s->streams[pkt->stream_index];

  1376.         AudioInterleaveContext *aic = st->priv_data;

  1377.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1378.             av_fifo_generic_write(&aic->fifo, pkt->data, pkt->size, NULL);

  1379.         } else {

  1380.             // rewrite pts and dts to be decoded time line position

  1381.             pkt->pts = pkt->dts = aic->dts;

  1382.             aic->dts += pkt->duration;

  1383.             ff_interleave_add_packet(s, pkt, mxf_compare_timestamps);

  1384.         }

  1385.         pkt = NULL;

  1386.     }

  1387. 

  1388.     for (i = 0; i < s->nb_streams; i++) {

  1389.         AVStream *st = s->streams[i];

  1390.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1391.             AVPacket new_pkt;

  1392.             while (mxf_interleave_new_audio_packet(s, &new_pkt, i, flush))

  1393.                 ff_interleave_add_packet(s, &new_pkt, mxf_compare_timestamps);

  1394.         }

  1395.     }

  1396. 

  1397.     return mxf_interleave_get_packet(s, out, pkt, flush);

  1398. }

  1399. 

  1400. AVOutputFormat mxf_muxer = {

  1401.     "mxf",

  1402.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1403.     NULL,

  1404.     "mxf",

  1405.     sizeof(MXFContext),

  1406.     CODEC_ID_PCM_S16LE,

  1407.     CODEC_ID_MPEG2VIDEO,

  1408.     mxf_write_header,

  1409.     mxf_write_packet,

  1410.     mxf_write_footer,

  1411.     AVFMT_NOTIMESTAMPS,

  1412.     NULL,

  1413.     mxf_interleave,

  1414. };