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FFmpeg/libavformat/mxfenc.c

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  1. /*

  2.  * MXF muxer

  3.  * Copyright (c) 2008 GUCAS, Zhentan Feng <spyfeng at gmail dot com>

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

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /*

  24.  * References

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

  26.  * SMPTE 377M MXF File Format Specifications

  27.  * SMPTE 379M MXF Generic Container

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

  29.  * SMPTE RP210: SMPTE Metadata Dictionary

  30.  * SMPTE RP224: Registry of SMPTE Universal Labels

  31.  */

  32. 

  33. //#define DEBUG

  34. 

  35. #include "libavutil/fifo.h"

  36. #include "mxf.h"

  37. 

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

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

  40. 

  41. #define MXF_INDEX_CLUSTER_SIZE 4096

  42. 

  43. typedef struct {

  44.     AVFifoBuffer fifo;

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

  46.     uint64_t dts;                 ///< current dts

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

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

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

  50. } AudioInterleaveContext;

  51. 

  52. typedef struct {

  53.     int local_tag;

  54.     UID uid;

  55. } MXFLocalTagPair;

  56. 

  57. typedef struct {

  58.     uint8_t flags;

  59.     uint64_t offset;

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

  61. } MXFIndexEntry;

  62. 

  63. typedef struct {

  64.     AudioInterleaveContext aic;

  65.     UID track_essence_element_key;

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

  67.     const UID *codec_ul;

  68.     int64_t duration;

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

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

  71.     int temporal_reordering;

  72. } MXFStreamContext;

  73. 

  74. typedef struct {

  75.     UID container_ul;

  76.     UID element_ul;

  77.     UID codec_ul;

  78.     void (*write_desc)();

  79. } MXFContainerEssenceEntry;

  80. 

  81. static const struct {

  82.     enum CodecID id;

  83.     int index;

  84. } mxf_essence_mappings[] = {

  85.     { CODEC_ID_MPEG2VIDEO, 0 },

  86.     { CODEC_ID_PCM_S24LE,  1 },

  87.     { CODEC_ID_PCM_S16LE,  1 },

  88.     { 0 }

  89. };

  90. 

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

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

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

  94. 

  95. static const MXFContainerEssenceEntry mxf_essence_container_uls[] = {

  96.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 },

  97.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

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

  99.       mxf_write_mpegvideo_desc },

  100.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },

  101.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x03,0x00 },

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

  103.       mxf_write_aes3_desc },

  104.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },

  105.       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x01,0x00 },

  106.       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },

  107.       mxf_write_wav_desc },

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

  109.       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  110.       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },

  111.       NULL },

  112. };

  113. 

  114. typedef struct MXFContext {

  115.     int64_t footer_partition_offset;

  116.     int essence_container_count;

  117.     uint8_t essence_containers_indices[FF_ARRAY_ELEMS(mxf_essence_container_uls)];

  118.     AVRational time_base;

  119.     int header_written;

  120.     MXFIndexEntry *index_entries;

  121.     unsigned edit_units_count;

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

  123. } MXFContext;

  124. 

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

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

  127. 

  128. /**

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

  130.  */

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

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

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

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

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

  136. 

  137. 

  138. 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

  139. 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

  140. 

  141. /**

  142.  * partial key for header metadata

  143.  */

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

  145. 

  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.     ByteIOContext *pb = s->pb;

  468.     MXFStreamContext *sc = st->priv_data;

  469. 

  470.     mxf_write_metadata_key(pb, 0x013b00);

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

  472.     klv_encode_ber_length(pb, 80);

  473. 

  474.     // write track uid

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

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

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

  478. 

  479.     // write track id

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

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

  482. 

  483.     // write track number

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

  485.     if (type == MaterialPackage)

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

  487.     else

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

  489. 

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

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

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

  493. 

  494.     // write origin

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

  496.     put_be64(pb, 0);

  497. 

  498.     // write sequence refs

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

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

  501. }

  502. 

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

  504. {

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

  506.     MXFStreamContext *sc = st->priv_data;

  507. 

  508.     // find data define uls

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

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

  511. 

  512.     // write duration

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

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

  515. }

  516. 

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

  518. {

  519.     ByteIOContext *pb = s->pb;

  520. 

  521.     mxf_write_metadata_key(pb, 0x010f00);

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

  523.     klv_encode_ber_length(pb, 80);

  524. 

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

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

  527. 

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

  529.     mxf_write_common_fields(pb, st);

  530. 

  531.     // write structural component

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

  533.     mxf_write_refs_count(pb, 1);

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

  535. }

  536. 

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

  538. {

  539.     ByteIOContext *pb = s->pb;

  540.     int i;

  541. 

  542.     mxf_write_metadata_key(pb, 0x011100);

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

  544.     klv_encode_ber_length(pb, 108);

  545. 

  546.     // write uid

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

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

  549. 

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

  551.     mxf_write_common_fields(pb, st);

  552. 

  553.     // write start_position

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

  555.     put_be64(pb, 0);

  556. 

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

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

  559.     if (type == SourcePackage) {

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

  561.             put_be64(pb, 0);

  562.     } else

  563.         mxf_write_umid(pb, SourcePackage, 0);

  564. 

  565.     // write source track id

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

  567.     if (type == SourcePackage)

  568.         put_be32(pb, 0);

  569.     else

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

  571. }

  572. 

  573. static void mxf_write_multi_descriptor(AVFormatContext *s)

  574. {

  575.     ByteIOContext *pb = s->pb;

  576.     int i;

  577. 

  578.     mxf_write_metadata_key(pb, 0x014400);

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

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

  581. 

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

  583.     mxf_write_uuid(pb, MultipleDescriptor, 0);

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

  585. 

  586.     // write sample rate

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

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

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

  590. 

  591.     // write essence container ul

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

  593.     put_buffer(pb, multiple_desc_ul, 16);

  594. 

  595.     // write sub descriptor refs

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

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

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

  599.         mxf_write_uuid(pb, SubDescriptor, i);

  600. }

  601. 

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

  603. {

  604.     MXFStreamContext *sc = st->priv_data;

  605. 

  606.     put_buffer(pb, key, 16);

  607.     klv_encode_ber_length(pb, size);

  608. 

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

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

  611. 

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

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

  614. 

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

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

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

  618. 

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

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

  621. }

  622. 

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

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

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

  626. 

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

  628. {

  629.     MXFStreamContext *sc = st->priv_data;

  630.     ByteIOContext *pb = s->pb;

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

  632.     AVRational dar;

  633.     int f1, f2;

  634. 

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

  636. 

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

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

  639. 

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

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

  642. 

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

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

  645. 

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

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

  648. 

  649.     // bit rate

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

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

  652. 

  653.     // frame layout

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

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

  656. 

  657.     // video line map

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

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

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

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

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

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

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

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

  666.     }

  667. 

  668.     if (!sc->interlaced) {

  669.         f2  = 0;

  670.         f1 *= 2;

  671.     }

  672. 

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

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

  675.     put_be32(pb, 4);

  676.     put_be32(pb, f1);

  677.     if (sc->interlaced)

  678.         put_be32(pb, f2);

  679. 

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

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

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

  683.               1024*1024);

  684. 

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

  686.     put_be32(pb, dar.num);

  687.     put_be32(pb, dar.den);

  688. 

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

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

  691. }

  692. 

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

  694. {

  695.     ByteIOContext *pb = s->pb;

  696. 

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

  698. 

  699.     // audio locked

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

  701.     put_byte(pb, 1);

  702. 

  703.     // write audio sampling rate

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

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

  706.     put_be32(pb, 1);

  707. 

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

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

  710. 

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

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

  713. }

  714. 

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

  716. {

  717.     ByteIOContext *pb = s->pb;

  718. 

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

  720. 

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

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

  723. 

  724.     // avg bytes per sec

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

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

  727. }

  728. 

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

  730. {

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

  732. }

  733. 

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

  735. {

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

  737. }

  738. 

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

  740. {

  741.     ByteIOContext *pb = s->pb;

  742.     int i;

  743. 

  744.     if (type == MaterialPackage) {

  745.         mxf_write_metadata_key(pb, 0x013600);

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

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

  748.     } else {

  749.         mxf_write_metadata_key(pb, 0x013700);

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

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

  752.     }

  753. 

  754.     // write uid

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

  756.     mxf_write_uuid(pb, type, 0);

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

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

  759. 

  760.     // write package umid

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

  762.     mxf_write_umid(pb, type, 0);

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

  764. 

  765.     // write create date

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

  767.     put_be64(pb, 0);

  768. 

  769.     // write modified date

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

  771.     put_be64(pb, 0);

  772. 

  773.     // write track refs

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

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

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

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

  778. 

  779.     // write multiple descriptor reference

  780.     if (type == SourcePackage) {

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

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

  783.             mxf_write_uuid(pb, MultipleDescriptor, 0);

  784.             mxf_write_multi_descriptor(s);

  785.         } else

  786.             mxf_write_uuid(pb, SubDescriptor, 0);

  787.     }

  788. 

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

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

  791.         mxf_write_track(s, st, type);

  792.         mxf_write_sequence(s, st, type);

  793.         mxf_write_structural_component(s, st, type);

  794. 

  795.         if (type == SourcePackage) {

  796.             MXFStreamContext *sc = st->priv_data;

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

  798.         }

  799.     }

  800. }

  801. 

  802. static int mxf_write_essence_container_data(AVFormatContext *s)

  803. {

  804.     ByteIOContext *pb = s->pb;

  805. 

  806.     mxf_write_metadata_key(pb, 0x012300);

  807.     klv_encode_ber_length(pb, 72);

  808. 

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

  810.     mxf_write_uuid(pb, EssenceContainerData, 0);

  811. 

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

  813.     mxf_write_umid(pb, SourcePackage, 0);

  814. 

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

  816.     put_be32(pb, 1);

  817. 

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

  819.     put_be32(pb, 2);

  820. 

  821.     return 0;

  822. }

  823. 

  824. static int mxf_write_header_metadata_sets(AVFormatContext *s)

  825. {

  826.     mxf_write_preface(s);

  827.     mxf_write_identification(s);

  828.     mxf_write_content_storage(s);

  829.     mxf_write_package(s, MaterialPackage);

  830.     mxf_write_package(s, SourcePackage);

  831.     mxf_write_essence_container_data(s);

  832.     return 0;

  833. }

  834. 

  835. static int mxf_write_index_table_segment(AVFormatContext *s)

  836. {

  837.     MXFContext *mxf = s->priv_data;

  838.     ByteIOContext *pb = s->pb;

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

  840.     int temporal_reordering = 0;

  841. 

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

  843. 

  844.     put_buffer(pb, index_table_segment_key, 16);

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

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

  847. 

  848.     // instance id

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

  850.     mxf_write_uuid(pb, IndexTableSegment, 0);

  851. 

  852.     // index edit rate

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

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

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

  856. 

  857.     // index start position

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

  859.     put_be64(pb, 0);

  860. 

  861.     // index duration

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

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

  864. 

  865.     // edit unit byte count

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

  867.     put_be32(pb, 0);

  868. 

  869.     // index sid

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

  871.     put_be32(pb, 2);

  872. 

  873.     // body sid

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

  875.     put_be32(pb, 1);

  876. 

  877.     // slice count - 1

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

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

  880. 

  881.     // delta entry array

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

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

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

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

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

  887.         MXFStreamContext *sc = st->priv_data;

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

  889.         if (sc->temporal_reordering)

  890.             temporal_reordering = 1;

  891.         put_byte(pb, i);

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

  893.     }

  894. 

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

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

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

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

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

  900.             key_offset = 0;

  901.         if (temporal_reordering) {

  902.             int temporal_offset = 0;

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

  904.                 temporal_offset++;

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

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

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

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

  909.                             temporal_offset = 0;

  910.                         else

  911.                             temporal_offset = -temporal_offset;

  912.                     }

  913.                     break;

  914.                 }

  915.             }

  916.             put_byte(pb, temporal_offset);

  917.         } else

  918.             put_byte(pb, 0);

  919.         put_byte(pb, key_offset);

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

  921.         // stream offset

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

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

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

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

  926.         }

  927.         key_offset--;

  928.     }

  929. 

  930.     return ret;

  931. }

  932. 

  933. static void mxf_write_partition(AVFormatContext *s, int bodysid, int indexsid,

  934.                                 const uint8_t *key, int write_metadata)

  935. {

  936.     MXFContext *mxf = s->priv_data;

  937.     ByteIOContext *pb = s->pb;

  938.     int64_t header_byte_count_offset;

  939. 

  940.     // write klv

  941.     put_buffer(pb, key, 16);

  942. 

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

  944. 

  945.     // write partition value

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

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

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

  949. 

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

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

  952. 

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

  954. 

  955.     // set offset

  956.     header_byte_count_offset = url_ftell(pb);

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

  958. 

  959.     // indexTable

  960.     put_be64(pb, indexsid ? 19 + 109 + s->nb_streams*6 +

  961.              mxf->edit_units_count*(11+(s->nb_streams-1)*4) : 0); // indexByteCount

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

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

  964. 

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

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

  967. 

  968.     // essence container

  969.     mxf_write_essence_container_refs(s);

  970. 

  971.     if (write_metadata) {

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

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

  974.         mxf_write_primer_pack(s);

  975.         mxf_write_header_metadata_sets(s);

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

  977.         // update header_byte_count

  978.         url_fseek(pb, header_byte_count_offset, SEEK_SET);

  979.         put_be64(pb, pos - start);

  980.         url_fseek(pb, pos, SEEK_SET);

  981.     }

  982. 

  983.     put_flush_packet(pb);

  984. }

  985. 

  986. static const UID mxf_mpeg2_codec_uls[] = {

  987.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x10,0x00 }, // MP-ML I-Frame

  988.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, // MP-ML Long GOP

  989.     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, // 422P-ML I-Frame

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

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

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

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

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

  995. };

  996. 

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

  998. {

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

  1000.         if (avctx->level == 8) // Main

  1001.             return avctx->gop_size ?

  1002.                 &mxf_mpeg2_codec_uls[1] :

  1003.                 &mxf_mpeg2_codec_uls[0];

  1004.         else if (avctx->level == 4) // High

  1005.             return avctx->gop_size ?

  1006.                 &mxf_mpeg2_codec_uls[5] :

  1007.                 &mxf_mpeg2_codec_uls[4];

  1008.     } else if (avctx->profile == 0) { // 422

  1009.         if (avctx->level == 5) // Main

  1010.             return avctx->gop_size ?

  1011.                 &mxf_mpeg2_codec_uls[3] :

  1012.                 &mxf_mpeg2_codec_uls[2];

  1013.         else if (avctx->level == 2) // High

  1014.             return avctx->gop_size ?

  1015.                 &mxf_mpeg2_codec_uls[7] :

  1016.                 &mxf_mpeg2_codec_uls[6];

  1017.     }

  1018.     return NULL;

  1019. }

  1020. 

  1021. static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st, AVPacket *pkt)

  1022. {

  1023.     MXFContext *mxf = s->priv_data;

  1024.     MXFStreamContext *sc = st->priv_data;

  1025.     uint32_t c = -1;

  1026.     int i;

  1027. 

  1028.     mxf->index_entries[mxf->edit_units_count].flags = 0;

  1029. 

  1030.     for(i = 0; i < pkt->size - 4; i++) {

  1031.         c = (c<<8) + pkt->data[i];

  1032.         if (c == 0x1B5) {

  1033.             if (i + 2 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x10) { // seq ext

  1034.                 st->codec->profile = pkt->data[i+1] & 0x07;

  1035.                 st->codec->level   = pkt->data[i+2] >> 4;

  1036.             } else if (i + 5 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x80) { // pict coding ext

  1037.                 sc->interlaced = !(pkt->data[i+5] & 0x80); // progressive frame

  1038.                 break;

  1039.             }

  1040.         } else if (c == 0x1b8) { // gop

  1041.             if (i + 4 < pkt->size && pkt->data[i+4]>>6 & 0x01) // closed

  1042.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x80; // random access

  1043.         } else if (c == 0x1b3) { // seq

  1044.             mxf->index_entries[mxf->edit_units_count].flags |= 0x40;

  1045.         } else if (c == 0x100) { // pic

  1046.             int pict_type = (pkt->data[i+2]>>3) & 0x07;

  1047.             if (pict_type == 2) { // P frame

  1048.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x22;

  1049.                 st->codec->gop_size = 1;

  1050.             } else if (pict_type == 3) { // B frame

  1051.                 mxf->index_entries[mxf->edit_units_count].flags |= 0x33;

  1052.                 sc->temporal_reordering = -1;

  1053.             } else if (!pict_type) {

  1054.                 av_log(s, AV_LOG_ERROR, "error parsing mpeg2 frame\n");

  1055.                 return 0;

  1056.             }

  1057.         }

  1058.     }

  1059.     sc->codec_ul = mxf_get_mpeg2_codec_ul(st->codec);

  1060.     return !!sc->codec_ul;

  1061. }

  1062. 

  1063. static int ff_audio_interleave_init(AVFormatContext *s, const int *samples_per_frame)

  1064. {

  1065.     int i;

  1066. 

  1067.     if (!samples_per_frame)

  1068.         return -1;

  1069. 

  1070.     for (i = 0; i < s->nb_streams; i++) {

  1071.         AVStream *st = s->streams[i];

  1072.         AudioInterleaveContext *aic = st->priv_data;

  1073. 

  1074.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1075.             aic->sample_size = (st->codec->channels *

  1076.                                 av_get_bits_per_sample(st->codec->codec_id)) / 8;

  1077.             if (!aic->sample_size) {

  1078.                 av_log(s, AV_LOG_ERROR, "could not compute sample size\n");

  1079.                 return -1;

  1080.             }

  1081.             aic->samples_per_frame = samples_per_frame;

  1082.             aic->samples = aic->samples_per_frame;

  1083. 

  1084.             av_fifo_init(&aic->fifo, 100 * *aic->samples);

  1085.         }

  1086.     }

  1087. 

  1088.     return 0;

  1089. }

  1090. 

  1091. static void ff_audio_interleave_close(AVFormatContext *s)

  1092. {

  1093.     int i;

  1094.     for (i = 0; i < s->nb_streams; i++) {

  1095.         AVStream *st = s->streams[i];

  1096.         AudioInterleaveContext *aic = st->priv_data;

  1097. 

  1098.         if (st->codec->codec_type == CODEC_TYPE_AUDIO)

  1099.             av_fifo_free(&aic->fifo);

  1100.     }

  1101. }

  1102. 

  1103. static int mxf_write_header(AVFormatContext *s)

  1104. {

  1105.     MXFContext *mxf = s->priv_data;

  1106.     int i;

  1107.     uint8_t present[FF_ARRAY_ELEMS(mxf_essence_container_uls)] = {0};

  1108.     const int *samples_per_frame = NULL;

  1109. 

  1110.     if (s->nb_streams > 17) {

  1111.         av_log(s, AV_LOG_ERROR, "error, mxf muxer supports 17 tracks maximum\n");

  1112.         return -1;

  1113.     }

  1114. 

  1115.     for (i = 0; i < s->nb_streams; i++) {

  1116.         AVStream *st = s->streams[i];

  1117.         MXFStreamContext *sc = av_mallocz(sizeof(*sc));

  1118.         if (!sc)

  1119.             return AVERROR(ENOMEM);

  1120.         st->priv_data = sc;

  1121. 

  1122.         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

  1123.             if (!av_cmp_q(st->codec->time_base, (AVRational){ 1, 25 })) {

  1124.                 samples_per_frame = PAL_samples_per_frame;

  1125.                 mxf->time_base = (AVRational){ 1, 25 };

  1126.             } else if (!av_cmp_q(st->codec->time_base, (AVRational){ 1001, 30000 })) {

  1127.                 samples_per_frame = NTSC_samples_per_frame;

  1128.                 mxf->time_base = (AVRational){ 1001, 30000 };

  1129.             } else {

  1130.                 av_log(s, AV_LOG_ERROR, "unsupported video frame rate\n");

  1131.                 return -1;

  1132.             }

  1133.             mxf->edit_unit_start = st->index;

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

  1135.             if (st->codec->sample_rate != 48000) {

  1136.                 av_log(s, AV_LOG_ERROR, "only 48khz is implemented\n");

  1137.                 return -1;

  1138.             }

  1139.         }

  1140.         sc->duration = -1;

  1141. 

  1142.         sc->index = mxf_get_essence_container_ul_index(st->codec->codec_id);

  1143.         if (sc->index == -1) {

  1144.             av_log(s, AV_LOG_ERROR, "track %d: could not find essence container ul, "

  1145.                    "codec not currently supported in container\n", i);

  1146.             return -1;

  1147.         }

  1148. 

  1149.         sc->codec_ul = &mxf_essence_container_uls[sc->index].codec_ul;

  1150. 

  1151.         if (!present[sc->index]) {

  1152.             mxf->essence_containers_indices[mxf->essence_container_count++] = sc->index;

  1153.             present[sc->index] = 1;

  1154.         } else

  1155.             present[sc->index]++;

  1156.         memcpy(sc->track_essence_element_key, mxf_essence_container_uls[sc->index].element_ul, 15);

  1157.         sc->track_essence_element_key[15] = present[sc->index];

  1158.         PRINT_KEY(s, "track essence element key", sc->track_essence_element_key);

  1159.     }

  1160. 

  1161.     for (i = 0; i < s->nb_streams; i++) {

  1162.         MXFStreamContext *sc = s->streams[i]->priv_data;

  1163.         av_set_pts_info(s->streams[i], 64, mxf->time_base.num, mxf->time_base.den);

  1164.         // update element count

  1165.         sc->track_essence_element_key[13] = present[sc->index];

  1166.         sc->order = AV_RB32(sc->track_essence_element_key+12);

  1167.     }

  1168. 

  1169.     if (!samples_per_frame)

  1170.         samples_per_frame = PAL_samples_per_frame;

  1171. 

  1172.     if (ff_audio_interleave_init(s, samples_per_frame) < 0)

  1173.         return -1;

  1174. 

  1175.     return 0;

  1176. }

  1177. 

  1178. static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)

  1179. {

  1180.     MXFContext *mxf = s->priv_data;

  1181.     ByteIOContext *pb = s->pb;

  1182.     AVStream *st = s->streams[pkt->stream_index];

  1183.     MXFStreamContext *sc = st->priv_data;

  1184. 

  1185.     if (!(mxf->edit_units_count % MXF_INDEX_CLUSTER_SIZE)) {

  1186.         mxf->index_entries = av_realloc(mxf->index_entries,

  1187.             (mxf->edit_units_count + MXF_INDEX_CLUSTER_SIZE)*

  1188.              sizeof(*mxf->index_entries));

  1189.         if (!mxf->index_entries) {

  1190.             av_log(s, AV_LOG_ERROR, "could not allocate index entries\n");

  1191.             return -1;

  1192.         }

  1193.     }

  1194. 

  1195.     if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {

  1196.         if (!mxf_parse_mpeg2_frame(s, st, pkt)) {

  1197.             av_log(s, AV_LOG_ERROR, "could not get mpeg2 profile and level\n");

  1198.             return -1;

  1199.         }

  1200.     }

  1201. 

  1202.     if (!mxf->header_written) {

  1203.         mxf_write_partition(s, 1, 0, header_open_partition_key, 1);

  1204.         mxf->header_written = 1;

  1205.     }

  1206. 

  1207.     if (st->index == mxf->edit_unit_start) {

  1208.         mxf->index_entries[mxf->edit_units_count].offset = url_ftell(pb);

  1209.         mxf->index_entries[mxf->edit_units_count].slice_offset[st->index] = 0;

  1210.         mxf->edit_units_count++;

  1211.     } else {

  1212.         mxf->index_entries[mxf->edit_units_count-1].slice_offset[st->index] =

  1213.             url_ftell(pb) - mxf->index_entries[mxf->edit_units_count-1].offset;

  1214.     }

  1215. 

  1216.     put_buffer(pb, sc->track_essence_element_key, 16); // write key

  1217.     klv_encode_ber_length(pb, pkt->size); // write length

  1218.     put_buffer(pb, pkt->data, pkt->size); // write value

  1219. 

  1220.     sc->duration = FFMAX(pkt->pts + pkt->duration, sc->duration);

  1221. 

  1222.     put_flush_packet(pb);

  1223.     return 0;

  1224. }

  1225. 

  1226. static void mxf_write_random_index_pack(AVFormatContext *s)

  1227. {

  1228.     MXFContext *mxf = s->priv_data;

  1229.     ByteIOContext *pb = s->pb;

  1230.     uint64_t pos = url_ftell(pb);

  1231. 

  1232.     put_buffer(pb, random_index_pack_key, 16);

  1233.     klv_encode_ber_length(pb, 28);

  1234. 

  1235.     put_be32(pb, 1); // BodySID of header partition

  1236.     put_be64(pb, 0); // offset of header partition

  1237. 

  1238.     put_be32(pb, 0); // BodySID of footer partition

  1239.     put_be64(pb, mxf->footer_partition_offset);

  1240. 

  1241.     put_be32(pb, url_ftell(pb) - pos + 4);

  1242. }

  1243. 

  1244. static int mxf_write_footer(AVFormatContext *s)

  1245. {

  1246.     MXFContext *mxf = s->priv_data;

  1247.     ByteIOContext *pb = s->pb;

  1248. 

  1249.     mxf->footer_partition_offset = url_ftell(pb);

  1250.     mxf_write_partition(s, 0, 2, footer_partition_key, 0);

  1251. 

  1252.     mxf_write_index_table_segment(s);

  1253. 

  1254.     mxf_write_random_index_pack(s);

  1255. 

  1256.     if (!url_is_streamed(s->pb)) {

  1257.         url_fseek(pb, 0, SEEK_SET);

  1258.         mxf_write_partition(s, 1, 0, header_closed_partition_key, 1);

  1259.     }

  1260. 

  1261.     ff_audio_interleave_close(s);

  1262. 

  1263.     mxf_free(s);

  1264.     return 0;

  1265. }

  1266. 

  1267. static int mxf_interleave_new_audio_packet(AVFormatContext *s, AVPacket *pkt,

  1268.                                            int stream_index, int flush)

  1269. {

  1270.     AVStream *st = s->streams[stream_index];

  1271.     AudioInterleaveContext *aic = st->priv_data;

  1272. 

  1273.     int size = FFMIN(av_fifo_size(&aic->fifo), *aic->samples * aic->sample_size);

  1274.     if (!size || (!flush && size == av_fifo_size(&aic->fifo)))

  1275.         return 0;

  1276. 

  1277.     av_new_packet(pkt, size);

  1278.     av_fifo_read(&aic->fifo, pkt->data, size);

  1279. 

  1280.     pkt->dts = pkt->pts = aic->dts;

  1281.     pkt->duration = av_rescale_q(*aic->samples,

  1282.                                  (AVRational){ 1, st->codec->sample_rate },

  1283.                                  st->time_base);

  1284.     pkt->stream_index = stream_index;

  1285.     aic->dts += pkt->duration;

  1286. 

  1287.     aic->samples++;

  1288.     if (!*aic->samples)

  1289.         aic->samples = aic->samples_per_frame;

  1290. 

  1291.     return size;

  1292. }

  1293. 

  1294. static int mxf_interleave_get_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

  1295. {

  1296.     AVPacketList *pktl;

  1297.     int stream_count = 0;

  1298.     int streams[MAX_STREAMS];

  1299. 

  1300.     memset(streams, 0, sizeof(streams));

  1301.     pktl = s->packet_buffer;

  1302.     while (pktl) {

  1303.         //av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);

  1304.         if (!streams[pktl->pkt.stream_index])

  1305.             stream_count++;

  1306.         streams[pktl->pkt.stream_index]++;

  1307.         pktl = pktl->next;

  1308.     }

  1309. 

  1310.     if (stream_count && (s->nb_streams == stream_count || flush)) {

  1311.         pktl = s->packet_buffer;

  1312.         if (s->nb_streams != stream_count) {

  1313.             MXFContext *mxf = s->priv_data;

  1314.             AVPacketList *first = NULL;

  1315.             // find first packet in edit unit

  1316.             while (pktl) {

  1317.                 AVStream *st = s->streams[pktl->pkt.stream_index];

  1318.                 if (st->index == mxf->edit_unit_start)

  1319.                     break;

  1320.                 else if (!first)

  1321.                     first = pktl;

  1322.                 pktl = pktl->next;

  1323.             }

  1324.             // purge packet queue

  1325.             while (pktl) {

  1326.                 AVPacketList *next = pktl->next;

  1327.                 av_free_packet(&pktl->pkt);

  1328.                 av_freep(&pktl);

  1329.                 pktl = next;

  1330.             }

  1331.             if (!first)

  1332.                 goto out;

  1333.             pktl = first;

  1334.         }

  1335. 

  1336.         *out = pktl->pkt;

  1337.         //av_log(s, AV_LOG_DEBUG, "out st:%d dts:%lld\n", (*out).stream_index, (*out).dts);

  1338.         s->packet_buffer = pktl->next;

  1339.         av_freep(&pktl);

  1340.         return 1;

  1341.     } else {

  1342.     out:

  1343.         av_init_packet(out);

  1344.         return 0;

  1345.     }

  1346. }

  1347. 

  1348. static int mxf_compare_timestamps(AVFormatContext *s, AVPacket *next, AVPacket *pkt)

  1349. {

  1350.     AVStream *st  = s->streams[pkt ->stream_index];

  1351.     AVStream *st2 = s->streams[next->stream_index];

  1352.     MXFStreamContext *sc  = st ->priv_data;

  1353.     MXFStreamContext *sc2 = st2->priv_data;

  1354. 

  1355.     int64_t left  = st2->time_base.num * (int64_t)st ->time_base.den;

  1356.     int64_t right = st ->time_base.num * (int64_t)st2->time_base.den;

  1357. 

  1358.     return next->dts * left > pkt->dts * right || // FIXME this can overflow

  1359.         (next->dts * left == pkt->dts * right && sc->order < sc2->order);

  1360. }

  1361. 

  1362. static int mxf_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

  1363. {

  1364.     int i;

  1365. 

  1366.     if (pkt) {

  1367.         AVStream *st = s->streams[pkt->stream_index];

  1368.         AudioInterleaveContext *aic = st->priv_data;

  1369.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1370.             av_fifo_generic_write(&aic->fifo, pkt->data, pkt->size, NULL);

  1371.         } else {

  1372.             // rewrite pts and dts to be decoded time line position

  1373.             pkt->pts = pkt->dts = aic->dts;

  1374.             aic->dts += pkt->duration;

  1375.             ff_interleave_add_packet(s, pkt, mxf_compare_timestamps);

  1376.         }

  1377.         pkt = NULL;

  1378.     }

  1379. 

  1380.     for (i = 0; i < s->nb_streams; i++) {

  1381.         AVStream *st = s->streams[i];

  1382.         if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  1383.             AVPacket new_pkt;

  1384.             while (mxf_interleave_new_audio_packet(s, &new_pkt, i, flush))

  1385.                 ff_interleave_add_packet(s, &new_pkt, mxf_compare_timestamps);

  1386.         }

  1387.     }

  1388. 

  1389.     return mxf_interleave_get_packet(s, out, pkt, flush);

  1390. }

  1391. 

  1392. AVOutputFormat mxf_muxer = {

  1393.     "mxf",

  1394.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1395.     NULL,

  1396.     "mxf",

  1397.     sizeof(MXFContext),

  1398.     CODEC_ID_PCM_S16LE,

  1399.     CODEC_ID_MPEG2VIDEO,

  1400.     mxf_write_header,

  1401.     mxf_write_packet,

  1402.     mxf_write_footer,

  1403.     AVFMT_NOTIMESTAMPS,

  1404.     NULL,

  1405.     mxf_interleave,

  1406. 

  1407. };