fix primer pack local tags uls
[ffmpeg.git] / libavformat / mxfenc.c
1 /*
2  * MXF muxer
3  * Copyright (c) 2008 GUCAS, Zhentan Feng <spyfeng at gmail dot com>
4  * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /*
24  * References
25  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
26  * SMPTE 377M MXF File Format Specifications
27  * SMPTE 379M MXF Generic Container
28  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
29  * SMPTE RP210: SMPTE Metadata Dictionary
30  * SMPTE RP224: Registry of SMPTE Universal Labels
31  */
32
33 //#define DEBUG
34
35 #include <math.h>
36 #include <time.h>
37
38 #include "libavutil/fifo.h"
39 #include "libavcodec/bytestream.h"
40 #include "audiointerleave.h"
41 #include "avformat.h"
42 #include "mxf.h"
43
44 static const int NTSC_samples_per_frame[] = { 1602, 1601, 1602, 1601, 1602, 0 };
45 static const int PAL_samples_per_frame[]  = { 1920, 0 };
46
47 #define MXF_INDEX_CLUSTER_SIZE 4096
48 #define KAG_SIZE 512
49
50 typedef struct {
51     int local_tag;
52     UID uid;
53 } MXFLocalTagPair;
54
55 typedef struct {
56     uint8_t flags;
57     uint64_t offset;
58     unsigned slice_offset; ///< offset of audio slice
59 } MXFIndexEntry;
60
61 typedef struct {
62     AudioInterleaveContext aic;
63     UID track_essence_element_key;
64     int index;            ///< index in mxf_essence_container_uls table
65     const UID *codec_ul;
66     int64_t duration;
67     int order;            ///< interleaving order if dts are equal
68     int interlaced;       ///< wether picture is interlaced
69     int temporal_reordering;
70 } MXFStreamContext;
71
72 typedef struct {
73     UID container_ul;
74     UID element_ul;
75     UID codec_ul;
76     void (*write_desc)();
77 } MXFContainerEssenceEntry;
78
79 static const struct {
80     enum CodecID id;
81     int index;
82 } mxf_essence_mappings[] = {
83     { CODEC_ID_MPEG2VIDEO, 0 },
84     { CODEC_ID_PCM_S24LE,  1 },
85     { CODEC_ID_PCM_S16LE,  1 },
86     { 0 }
87 };
88
89 static void mxf_write_wav_desc(AVFormatContext *s, AVStream *st);
90 static void mxf_write_aes3_desc(AVFormatContext *s, AVStream *st);
91 static void mxf_write_mpegvideo_desc(AVFormatContext *s, AVStream *st);
92
93 static const MXFContainerEssenceEntry mxf_essence_container_uls[] = {
94     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 },
95       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },
96       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x00,0x00,0x00 },
97       mxf_write_mpegvideo_desc },
98     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },
99       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x03,0x00 },
100       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
101       mxf_write_aes3_desc },
102     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },
103       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x01,0x00 },
104       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
105       mxf_write_wav_desc },
106     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
107       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
108       { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
109       NULL },
110 };
111
112 typedef struct MXFContext {
113     int64_t footer_partition_offset;
114     int essence_container_count;
115     uint8_t essence_containers_indices[FF_ARRAY_ELEMS(mxf_essence_container_uls)];
116     AVRational time_base;
117     int header_written;
118     MXFIndexEntry *index_entries;
119     unsigned edit_units_count;
120     uint64_t timestamp;   ///< timestamp, as year(16),month(8),day(8),hour(8),minutes(8),msec/4(8)
121     uint8_t slice_count;  ///< index slice count minus 1 (1 if no audio, 0 otherwise)
122 } MXFContext;
123
124 static const uint8_t uuid_base[]            = { 0xAD,0xAB,0x44,0x24,0x2f,0x25,0x4d,0xc7,0x92,0xff,0x29,0xbd };
125 static const uint8_t umid_base[]            = { 0x06,0x0A,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x01,0x0D,0x00,0x13,0x00,0x00,0x00 };
126
127 /**
128  * complete key for operation pattern, partitions, and primer pack
129  */
130 static const uint8_t op1a_ul[]                     = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x01,0x01,0x00 };
131 static const uint8_t footer_partition_key[]        = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }; // ClosedComplete
132 static const uint8_t primer_pack_key[]             = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x05,0x01,0x00 };
133 static const uint8_t index_table_segment_key[]     = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 };
134 static const uint8_t random_index_pack_key[]       = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x11,0x01,0x00 };
135 static const uint8_t header_open_partition_key[]   = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }; // OpenIncomplete
136 static const uint8_t header_closed_partition_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }; // ClosedComplete
137 static const uint8_t klv_fill_key[]                = { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x03,0x01,0x02,0x10,0x01,0x00,0x00,0x00 };
138
139 /**
140  * partial key for header metadata
141  */
142 static const uint8_t header_metadata_key[]  = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0D,0x01,0x01,0x01,0x01 };
143 static const uint8_t multiple_desc_ul[]     = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x0D,0x01,0x03,0x01,0x02,0x7F,0x01,0x00 };
144
145 /**
146  * SMPTE RP210 http://www.smpte-ra.org/mdd/index.html
147  */
148 static const MXFLocalTagPair mxf_local_tag_batch[] = {
149     // preface set
150     { 0x3C0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x02,0x00,0x00,0x00,0x00}}, /* Instance UID */
151     { 0x3B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x04,0x00,0x00}}, /* Last Modified Date */
152     { 0x3B05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x03,0x01,0x02,0x01,0x05,0x00,0x00,0x00}}, /* Version */
153     { 0x3B06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x04,0x00,0x00}}, /* Identifications reference */
154     { 0x3B03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x01,0x00,0x00}}, /* Content Storage reference */
155     { 0x3B09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x03,0x00,0x00,0x00,0x00}}, /* Operational Pattern UL */
156     { 0x3B0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x01,0x00,0x00}}, /* Essence Containers UL batch */
157     { 0x3B0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x02,0x00,0x00}}, /* DM Schemes UL batch */
158     // Identification
159     { 0x3C09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x01,0x00,0x00,0x00}}, /* This Generation UID */
160     { 0x3C01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x02,0x01,0x00,0x00}}, /* Company Name */
161     { 0x3C02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x03,0x01,0x00,0x00}}, /* Product Name */
162     { 0x3C04, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x05,0x01,0x00,0x00}}, /* Version String */
163     { 0x3C05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x07,0x00,0x00,0x00}}, /* Product ID */
164     { 0x3C06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x03,0x00,0x00}}, /* Modification Date */
165     // Content Storage
166     { 0x1901, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x01,0x00,0x00}}, /* Package strong reference batch */
167     { 0x1902, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x02,0x00,0x00}}, /* Package strong reference batch */
168     // Essence Container Data
169     { 0x2701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x06,0x01,0x00,0x00,0x00}}, /* Linked Package UID */
170     { 0x3F07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x04,0x00,0x00,0x00,0x00}}, /* BodySID */
171     // Package
172     { 0x4401, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x10,0x00,0x00,0x00,0x00}}, /* Package UID */
173     { 0x4405, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x01,0x03,0x00,0x00}}, /* Package Creation Date */
174     { 0x4404, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x05,0x00,0x00}}, /* Package Modified Date */
175     { 0x4403, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x05,0x00,0x00}}, /* Tracks Strong reference array */
176     { 0x4701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x03,0x00,0x00}}, /* Descriptor */
177     // Track
178     { 0x4801, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x07,0x01,0x01,0x00,0x00,0x00,0x00}}, /* Track ID */
179     { 0x4804, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x04,0x01,0x03,0x00,0x00,0x00,0x00}}, /* Track Number */
180     { 0x4B01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x30,0x04,0x05,0x00,0x00,0x00,0x00}}, /* Edit Rate */
181     { 0x4B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x03,0x00,0x00}}, /* Origin */
182     { 0x4803, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x04,0x00,0x00}}, /* Sequence reference */
183     // Sequence
184     { 0x0201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x07,0x01,0x00,0x00,0x00,0x00,0x00}}, /* Data Definition UL */
185     { 0x0202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x02,0x01,0x01,0x03,0x00,0x00}}, /* Duration */
186     { 0x1001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x09,0x00,0x00}}, /* Structural Components reference array */
187     // Source Clip
188     { 0x1201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x04,0x00,0x00}}, /* Start position */
189     { 0x1101, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x01,0x00,0x00,0x00}}, /* SourcePackageID */
190     { 0x1102, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x02,0x00,0x00,0x00}}, /* SourceTrackID */
191     // File Descriptor
192     { 0x3F01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x04,0x06,0x0B,0x00,0x00}}, /* Sub Descriptors reference array */
193     { 0x3006, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x06,0x01,0x01,0x03,0x05,0x00,0x00,0x00}}, /* Linked Track ID */
194     { 0x3001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x00,0x00,0x00,0x00}}, /* SampleRate */
195     { 0x3004, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x01,0x02,0x00,0x00}}, /* Essence Container */
196     // Generic Picture Essence Descriptor
197     { 0x320C, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Frame Layout */
198     { 0x320D, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x03,0x02,0x05,0x00,0x00,0x00}}, /* Video Line Map */
199     { 0x3203, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x02,0x00,0x00,0x00}}, /* Stored Width */
200     { 0x3202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x01,0x00,0x00,0x00}}, /* Stored Height */
201     { 0x3209, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0C,0x00,0x00,0x00}}, /* Display Width */
202     { 0x3208, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0B,0x00,0x00,0x00}}, /* Display Height */
203     { 0x320E, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x01,0x01,0x01,0x00,0x00,0x00}}, /* Aspect Ratio */
204     { 0x3201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x06,0x01,0x00,0x00,0x00,0x00}}, /* Picture Essence Coding */
205     // Generic Sound Essence Descriptor
206     { 0x3D02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Locked/Unlocked */
207     { 0x3D03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x01,0x01,0x00,0x00}}, /* Audio sampling rate */
208     { 0x3D07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x01,0x01,0x04,0x00,0x00,0x00}}, /* ChannelCount */
209     { 0x3D01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x03,0x04,0x00,0x00,0x00}}, /* Quantization bits */
210     { 0x3D06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x02,0x04,0x02,0x00,0x00,0x00,0x00}}, /* Sound Essence Compression */
211     // Index Table Segment
212     { 0x3F0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x05,0x30,0x04,0x06,0x00,0x00,0x00,0x00}}, /* Index Edit Rate */
213     { 0x3F0C, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x01,0x03,0x01,0x0A,0x00,0x00}}, /* Index Start Position */
214     { 0x3F0D, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x02,0x01,0x01,0x02,0x00,0x00}}, /* Index Duration */
215     { 0x3F05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x06,0x02,0x01,0x00,0x00,0x00,0x00}}, /* Edit Unit Byte Count */
216     { 0x3F06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x05,0x00,0x00,0x00,0x00}}, /* IndexSID */
217     { 0x3F08, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x04,0x04,0x01,0x01,0x00,0x00,0x00}}, /* Slice Count */
218     { 0x3F09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x04,0x04,0x01,0x06,0x00,0x00,0x00}}, /* Delta Entry Array */
219     { 0x3F0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x04,0x04,0x02,0x05,0x00,0x00,0x00}}, /* Index Entry Array */
220     // MPEG video Descriptor
221     { 0x8000, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x01,0x06,0x02,0x01,0x0B,0x00,0x00}}, /* BitRate */
222     // Wave Audio Essence Descriptor
223     { 0x3D09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x03,0x05,0x00,0x00,0x00}}, /* Average Bytes Per Second */
224     { 0x3D0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x02,0x01,0x00,0x00,0x00}}, /* Block Align */
225 };
226
227 static void mxf_write_uuid(ByteIOContext *pb, enum MXFMetadataSetType type, int value)
228 {
229     put_buffer(pb, uuid_base, 12);
230     put_be16(pb, type);
231     put_be16(pb, value);
232 }
233
234 static void mxf_write_umid(ByteIOContext *pb, enum MXFMetadataSetType type, int value)
235 {
236     put_buffer(pb, umid_base, 16);
237     mxf_write_uuid(pb, type, value);
238 }
239
240 static void mxf_write_refs_count(ByteIOContext *pb, int ref_count)
241 {
242     put_be32(pb, ref_count);
243     put_be32(pb, 16);
244 }
245
246 static int klv_ber_length(uint64_t len)
247 {
248     if (len < 128)
249         return 1;
250     else
251         return (av_log2(len) >> 3) + 2;
252 }
253
254 static int klv_encode_ber_length(ByteIOContext *pb, uint64_t len)
255 {
256     // Determine the best BER size
257     int size;
258     if (len < 128) {
259         //short form
260         put_byte(pb, len);
261         return 1;
262     }
263
264     size = (av_log2(len) >> 3) + 1;
265
266     // long form
267     put_byte(pb, 0x80 + size);
268     while(size) {
269         size--;
270         put_byte(pb, len >> 8 * size & 0xff);
271     }
272     return 0;
273 }
274
275 /*
276  * Get essence container ul index
277  */
278 static int mxf_get_essence_container_ul_index(enum CodecID id)
279 {
280     int i;
281     for (i = 0; mxf_essence_mappings[i].id; i++)
282         if (mxf_essence_mappings[i].id == id)
283             return mxf_essence_mappings[i].index;
284     return -1;
285 }
286
287 static void mxf_write_primer_pack(AVFormatContext *s)
288 {
289     ByteIOContext *pb = s->pb;
290     int local_tag_number, i = 0;
291
292     local_tag_number = FF_ARRAY_ELEMS(mxf_local_tag_batch);
293
294     put_buffer(pb, primer_pack_key, 16);
295     klv_encode_ber_length(pb, local_tag_number * 18 + 8);
296
297     put_be32(pb, local_tag_number); // local_tag num
298     put_be32(pb, 18); // item size, always 18 according to the specs
299
300     for (i = 0; i < local_tag_number; i++) {
301         put_be16(pb, mxf_local_tag_batch[i].local_tag);
302         put_buffer(pb, mxf_local_tag_batch[i].uid, 16);
303     }
304 }
305
306 static void mxf_write_local_tag(ByteIOContext *pb, int size, int tag)
307 {
308     put_be16(pb, tag);
309     put_be16(pb, size);
310 }
311
312 static void mxf_write_metadata_key(ByteIOContext *pb, unsigned int value)
313 {
314     put_buffer(pb, header_metadata_key, 13);
315     put_be24(pb, value);
316 }
317
318 static void mxf_free(AVFormatContext *s)
319 {
320     int i;
321
322     for (i = 0; i < s->nb_streams; i++) {
323         AVStream *st = s->streams[i];
324         av_freep(&st->priv_data);
325     }
326 }
327
328 static const MXFCodecUL *mxf_get_data_definition_ul(int type)
329 {
330     const MXFCodecUL *uls = ff_mxf_data_definition_uls;
331     while (uls->uid[0]) {
332         if (type == uls->id)
333             break;
334         uls++;
335     }
336     return uls;
337 }
338
339 static void mxf_write_essence_container_refs(AVFormatContext *s)
340 {
341     MXFContext *c = s->priv_data;
342     ByteIOContext *pb = s->pb;
343     int i;
344
345     mxf_write_refs_count(pb, c->essence_container_count);
346     av_log(s,AV_LOG_DEBUG, "essence container count:%d\n", c->essence_container_count);
347     for (i = 0; i < c->essence_container_count; i++) {
348         put_buffer(pb, mxf_essence_container_uls[c->essence_containers_indices[i]].container_ul, 16);
349         PRINT_KEY(s, "essence container ul:\n", mxf_essence_container_uls[c->essence_containers_indices[i]].container_ul);
350     }
351 }
352
353 static void mxf_write_preface(AVFormatContext *s)
354 {
355     MXFContext *mxf = s->priv_data;
356     ByteIOContext *pb = s->pb;
357
358     mxf_write_metadata_key(pb, 0x012f00);
359     PRINT_KEY(s, "preface key", pb->buf_ptr - 16);
360     klv_encode_ber_length(pb, 130 + 16 * mxf->essence_container_count);
361
362     // write preface set uid
363     mxf_write_local_tag(pb, 16, 0x3C0A);
364     mxf_write_uuid(pb, Preface, 0);
365     PRINT_KEY(s, "preface uid", pb->buf_ptr - 16);
366
367     // last modified date
368     mxf_write_local_tag(pb, 8, 0x3B02);
369     put_be64(pb, mxf->timestamp);
370
371     // write version
372     mxf_write_local_tag(pb, 2, 0x3B05);
373     put_be16(pb, 1);
374
375     // write identification_refs
376     mxf_write_local_tag(pb, 16 + 8, 0x3B06);
377     mxf_write_refs_count(pb, 1);
378     mxf_write_uuid(pb, Identification, 0);
379
380     // write content_storage_refs
381     mxf_write_local_tag(pb, 16, 0x3B03);
382     mxf_write_uuid(pb, ContentStorage, 0);
383
384     // operational pattern
385     mxf_write_local_tag(pb, 16, 0x3B09);
386     if (s->nb_streams > 1) {
387         put_buffer(pb, op1a_ul, 14);
388         put_be16(pb, 0x0900); // multi track
389     } else {
390         put_buffer(pb, op1a_ul, 16);
391     }
392
393     // write essence_container_refs
394     mxf_write_local_tag(pb, 8 + 16 * mxf->essence_container_count, 0x3B0A);
395     mxf_write_essence_container_refs(s);
396
397     // write dm_scheme_refs
398     mxf_write_local_tag(pb, 8, 0x3B0B);
399     put_be64(pb, 0);
400 }
401
402 /*
403  * Write a local tag containing an ascii string as utf-16
404  */
405 static void mxf_write_local_tag_utf16(ByteIOContext *pb, int tag, const char *value)
406 {
407     int i, size = strlen(value);
408     mxf_write_local_tag(pb, size*2, tag);
409     for (i = 0; i < size; i++)
410         put_be16(pb, value[i]);
411 }
412
413 static void mxf_write_identification(AVFormatContext *s)
414 {
415     MXFContext *mxf = s->priv_data;
416     ByteIOContext *pb = s->pb;
417     const char *company = "FFmpeg";
418     const char *product = "OP1a Muxer";
419     const char *version;
420     int length;
421
422     mxf_write_metadata_key(pb, 0x013000);
423     PRINT_KEY(s, "identification key", pb->buf_ptr - 16);
424
425     version = s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT ?
426         "0.0.0" : AV_STRINGIFY(LIBAVFORMAT_VERSION);
427     length = 84 + (strlen(company)+strlen(product)+strlen(version))*2; // utf-16
428     klv_encode_ber_length(pb, length);
429
430     // write uid
431     mxf_write_local_tag(pb, 16, 0x3C0A);
432     mxf_write_uuid(pb, Identification, 0);
433     PRINT_KEY(s, "identification uid", pb->buf_ptr - 16);
434
435     // write generation uid
436     mxf_write_local_tag(pb, 16, 0x3C09);
437     mxf_write_uuid(pb, Identification, 1);
438
439     mxf_write_local_tag_utf16(pb, 0x3C01, company); // Company Name
440     mxf_write_local_tag_utf16(pb, 0x3C02, product); // Product Name
441     mxf_write_local_tag_utf16(pb, 0x3C04, version); // Version String
442
443     // write product uid
444     mxf_write_local_tag(pb, 16, 0x3C05);
445     mxf_write_uuid(pb, Identification, 2);
446
447     // modification date
448     mxf_write_local_tag(pb, 8, 0x3C06);
449     put_be64(pb, mxf->timestamp);
450 }
451
452 static void mxf_write_content_storage(AVFormatContext *s)
453 {
454     ByteIOContext *pb = s->pb;
455
456     mxf_write_metadata_key(pb, 0x011800);
457     PRINT_KEY(s, "content storage key", pb->buf_ptr - 16);
458     klv_encode_ber_length(pb, 92);
459
460     // write uid
461     mxf_write_local_tag(pb, 16, 0x3C0A);
462     mxf_write_uuid(pb, ContentStorage, 0);
463     PRINT_KEY(s, "content storage uid", pb->buf_ptr - 16);
464
465     // write package reference
466     mxf_write_local_tag(pb, 16 * 2 + 8, 0x1901);
467     mxf_write_refs_count(pb, 2);
468     mxf_write_uuid(pb, MaterialPackage, 0);
469     mxf_write_uuid(pb, SourcePackage, 0);
470
471     // write essence container data
472     mxf_write_local_tag(pb, 8 + 16, 0x1902);
473     mxf_write_refs_count(pb, 1);
474     mxf_write_uuid(pb, EssenceContainerData, 0);
475 }
476
477 static void mxf_write_track(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
478 {
479     MXFContext *mxf = s->priv_data;
480     ByteIOContext *pb = s->pb;
481     MXFStreamContext *sc = st->priv_data;
482
483     mxf_write_metadata_key(pb, 0x013b00);
484     PRINT_KEY(s, "track key", pb->buf_ptr - 16);
485     klv_encode_ber_length(pb, 80);
486
487     // write track uid
488     mxf_write_local_tag(pb, 16, 0x3C0A);
489     mxf_write_uuid(pb, type == MaterialPackage ? Track : Track + TypeBottom, st->index);
490     PRINT_KEY(s, "track uid", pb->buf_ptr - 16);
491
492     // write track id
493     mxf_write_local_tag(pb, 4, 0x4801);
494     put_be32(pb, st->index);
495
496     // write track number
497     mxf_write_local_tag(pb, 4, 0x4804);
498     if (type == MaterialPackage)
499         put_be32(pb, 0); // track number of material package is 0
500     else
501         put_buffer(pb, sc->track_essence_element_key + 12, 4);
502
503     mxf_write_local_tag(pb, 8, 0x4B01);
504     put_be32(pb, mxf->time_base.den);
505     put_be32(pb, mxf->time_base.num);
506
507     // write origin
508     mxf_write_local_tag(pb, 8, 0x4B02);
509     put_be64(pb, 0);
510
511     // write sequence refs
512     mxf_write_local_tag(pb, 16, 0x4803);
513     mxf_write_uuid(pb, type == MaterialPackage ? Sequence: Sequence + TypeBottom, st->index);
514 }
515
516 static void mxf_write_common_fields(ByteIOContext *pb, AVStream *st)
517 {
518     const MXFCodecUL *data_def_ul = mxf_get_data_definition_ul(st->codec->codec_type);
519     MXFStreamContext *sc = st->priv_data;
520
521     // find data define uls
522     mxf_write_local_tag(pb, 16, 0x0201);
523     put_buffer(pb, data_def_ul->uid, 16);
524
525     // write duration
526     mxf_write_local_tag(pb, 8, 0x0202);
527     put_be64(pb, sc->duration);
528 }
529
530 static void mxf_write_sequence(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
531 {
532     ByteIOContext *pb = s->pb;
533
534     mxf_write_metadata_key(pb, 0x010f00);
535     PRINT_KEY(s, "sequence key", pb->buf_ptr - 16);
536     klv_encode_ber_length(pb, 80);
537
538     mxf_write_local_tag(pb, 16, 0x3C0A);
539     mxf_write_uuid(pb, type == MaterialPackage ? Sequence: Sequence + TypeBottom, st->index);
540
541     PRINT_KEY(s, "sequence uid", pb->buf_ptr - 16);
542     mxf_write_common_fields(pb, st);
543
544     // write structural component
545     mxf_write_local_tag(pb, 16 + 8, 0x1001);
546     mxf_write_refs_count(pb, 1);
547     mxf_write_uuid(pb, type == MaterialPackage ? SourceClip: SourceClip + TypeBottom, st->index);
548 }
549
550 static void mxf_write_structural_component(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
551 {
552     ByteIOContext *pb = s->pb;
553     int i;
554
555     mxf_write_metadata_key(pb, 0x011100);
556     PRINT_KEY(s, "sturctural component key", pb->buf_ptr - 16);
557     klv_encode_ber_length(pb, 108);
558
559     // write uid
560     mxf_write_local_tag(pb, 16, 0x3C0A);
561     mxf_write_uuid(pb, type == MaterialPackage ? SourceClip: SourceClip + TypeBottom, st->index);
562
563     PRINT_KEY(s, "structural component uid", pb->buf_ptr - 16);
564     mxf_write_common_fields(pb, st);
565
566     // write start_position
567     mxf_write_local_tag(pb, 8, 0x1201);
568     put_be64(pb, 0);
569
570     // write source package uid, end of the reference
571     mxf_write_local_tag(pb, 32, 0x1101);
572     if (type == SourcePackage) {
573         for (i = 0; i < 4; i++)
574             put_be64(pb, 0);
575     } else
576         mxf_write_umid(pb, SourcePackage, 0);
577
578     // write source track id
579     mxf_write_local_tag(pb, 4, 0x1102);
580     if (type == SourcePackage)
581         put_be32(pb, 0);
582     else
583         put_be32(pb, st->index);
584 }
585
586 static void mxf_write_multi_descriptor(AVFormatContext *s)
587 {
588     MXFContext *mxf = s->priv_data;
589     ByteIOContext *pb = s->pb;
590     int i;
591
592     mxf_write_metadata_key(pb, 0x014400);
593     PRINT_KEY(s, "multiple descriptor key", pb->buf_ptr - 16);
594     klv_encode_ber_length(pb, 64 + 16 * s->nb_streams);
595
596     mxf_write_local_tag(pb, 16, 0x3C0A);
597     mxf_write_uuid(pb, MultipleDescriptor, 0);
598     PRINT_KEY(s, "multi_desc uid", pb->buf_ptr - 16);
599
600     // write sample rate
601     mxf_write_local_tag(pb, 8, 0x3001);
602     put_be32(pb, mxf->time_base.den);
603     put_be32(pb, mxf->time_base.num);
604
605     // write essence container ul
606     mxf_write_local_tag(pb, 16, 0x3004);
607     put_buffer(pb, multiple_desc_ul, 16);
608
609     // write sub descriptor refs
610     mxf_write_local_tag(pb, s->nb_streams * 16 + 8, 0x3F01);
611     mxf_write_refs_count(pb, s->nb_streams);
612     for (i = 0; i < s->nb_streams; i++)
613         mxf_write_uuid(pb, SubDescriptor, i);
614 }
615
616 static void mxf_write_generic_desc(AVFormatContext *s, AVStream *st, const UID key, unsigned size)
617 {
618     MXFContext *mxf = s->priv_data;
619     MXFStreamContext *sc = st->priv_data;
620     ByteIOContext *pb = s->pb;
621
622     put_buffer(pb, key, 16);
623     klv_encode_ber_length(pb, size);
624
625     mxf_write_local_tag(pb, 16, 0x3C0A);
626     mxf_write_uuid(pb, SubDescriptor, st->index);
627
628     mxf_write_local_tag(pb, 4, 0x3006);
629     put_be32(pb, st->index);
630
631     mxf_write_local_tag(pb, 8, 0x3001);
632     put_be32(pb, mxf->time_base.den);
633     put_be32(pb, mxf->time_base.num);
634
635     mxf_write_local_tag(pb, 16, 0x3004);
636     put_buffer(pb, mxf_essence_container_uls[sc->index].container_ul, 16);
637 }
638
639 static const UID mxf_mpegvideo_descriptor_key = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 };
640 static const UID mxf_wav_descriptor_key       = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 };
641 static const UID mxf_aes3_descriptor_key      = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 };
642
643 static void mxf_write_mpegvideo_desc(AVFormatContext *s, AVStream *st)
644 {
645     MXFStreamContext *sc = st->priv_data;
646     ByteIOContext *pb = s->pb;
647     int stored_height = (st->codec->height+15)/16*16;
648     AVRational dar;
649     int f1, f2;
650
651     mxf_write_generic_desc(s, st, mxf_mpegvideo_descriptor_key, 153+sc->interlaced*4);
652
653     mxf_write_local_tag(pb, 4, 0x3203);
654     put_be32(pb, st->codec->width);
655
656     mxf_write_local_tag(pb, 4, 0x3202);
657     put_be32(pb, stored_height>>sc->interlaced);
658
659     mxf_write_local_tag(pb, 4, 0x3209);
660     put_be32(pb, st->codec->width);
661
662     mxf_write_local_tag(pb, 4, 0x3208);
663     put_be32(pb, st->codec->height>>sc->interlaced);
664
665     // bit rate
666     mxf_write_local_tag(pb, 4, 0x8000);
667     put_be32(pb, st->codec->bit_rate);
668
669     // frame layout
670     mxf_write_local_tag(pb, 1, 0x320C);
671     put_byte(pb, sc->interlaced);
672
673     // video line map
674     switch (st->codec->height) {
675     case  576: f1 = 23; f2 = 336; break;
676     case  608: f1 =  7; f2 = 320; break;
677     case  480: f1 = 20; f2 = 283; break;
678     case  512: f1 =  7; f2 = 270; break;
679     case  720: f1 = 26; f2 =   0; break; // progressive
680     case 1080: f1 = 21; f2 = 584; break;
681     default:   f1 =  0; f2 =   0; break;
682     }
683
684     if (!sc->interlaced) {
685         f2  = 0;
686         f1 *= 2;
687     }
688
689     mxf_write_local_tag(pb, 12+sc->interlaced*4, 0x320D);
690     put_be32(pb, sc->interlaced ? 2 : 1);
691     put_be32(pb, 4);
692     put_be32(pb, f1);
693     if (sc->interlaced)
694         put_be32(pb, f2);
695
696     av_reduce(&dar.num, &dar.den,
697               st->codec->width*st->codec->sample_aspect_ratio.num,
698               st->codec->height*st->codec->sample_aspect_ratio.den,
699               1024*1024);
700
701     mxf_write_local_tag(pb, 8, 0x320E);
702     put_be32(pb, dar.num);
703     put_be32(pb, dar.den);
704
705     mxf_write_local_tag(pb, 16, 0x3201);
706     put_buffer(pb, *sc->codec_ul, 16);
707 }
708
709 static void mxf_write_generic_sound_desc(AVFormatContext *s, AVStream *st, const UID key, unsigned size)
710 {
711     ByteIOContext *pb = s->pb;
712
713     mxf_write_generic_desc(s, st, key, size);
714
715     // audio locked
716     mxf_write_local_tag(pb, 1, 0x3D02);
717     put_byte(pb, 1);
718
719     // write audio sampling rate
720     mxf_write_local_tag(pb, 8, 0x3D03);
721     put_be32(pb, st->codec->sample_rate);
722     put_be32(pb, 1);
723
724     mxf_write_local_tag(pb, 4, 0x3D07);
725     put_be32(pb, st->codec->channels);
726
727     mxf_write_local_tag(pb, 4, 0x3D01);
728     put_be32(pb, av_get_bits_per_sample(st->codec->codec_id));
729 }
730
731 static void mxf_write_wav_common_desc(AVFormatContext *s, AVStream *st, const UID key, unsigned size)
732 {
733     ByteIOContext *pb = s->pb;
734
735     mxf_write_generic_sound_desc(s, st, key, size);
736
737     mxf_write_local_tag(pb, 2, 0x3D0A);
738     put_be16(pb, st->codec->block_align);
739
740     // avg bytes per sec
741     mxf_write_local_tag(pb, 4, 0x3D09);
742     put_be32(pb, st->codec->block_align*st->codec->sample_rate);
743 }
744
745 static void mxf_write_wav_desc(AVFormatContext *s, AVStream *st)
746 {
747     mxf_write_wav_common_desc(s, st, mxf_wav_descriptor_key, 107);
748 }
749
750 static void mxf_write_aes3_desc(AVFormatContext *s, AVStream *st)
751 {
752     mxf_write_wav_common_desc(s, st, mxf_aes3_descriptor_key, 107);
753 }
754
755 static void mxf_write_package(AVFormatContext *s, enum MXFMetadataSetType type)
756 {
757     MXFContext *mxf = s->priv_data;
758     ByteIOContext *pb = s->pb;
759     int i;
760
761     if (type == MaterialPackage) {
762         mxf_write_metadata_key(pb, 0x013600);
763         PRINT_KEY(s, "Material Package key", pb->buf_ptr - 16);
764         klv_encode_ber_length(pb, 92 + 16 * s->nb_streams);
765     } else {
766         mxf_write_metadata_key(pb, 0x013700);
767         PRINT_KEY(s, "Source Package key", pb->buf_ptr - 16);
768         klv_encode_ber_length(pb, 112 + 16 * s->nb_streams); // 20 bytes length for descriptor reference
769     }
770
771     // write uid
772     mxf_write_local_tag(pb, 16, 0x3C0A);
773     mxf_write_uuid(pb, type, 0);
774     av_log(s,AV_LOG_DEBUG, "package type:%d\n", type);
775     PRINT_KEY(s, "package uid", pb->buf_ptr - 16);
776
777     // write package umid
778     mxf_write_local_tag(pb, 32, 0x4401);
779     mxf_write_umid(pb, type, 0);
780     PRINT_KEY(s, "package umid second part", pb->buf_ptr - 16);
781
782     // package creation date
783     mxf_write_local_tag(pb, 8, 0x4405);
784     put_be64(pb, mxf->timestamp);
785
786     // package modified date
787     mxf_write_local_tag(pb, 8, 0x4404);
788     put_be64(pb, mxf->timestamp);
789
790     // write track refs
791     mxf_write_local_tag(pb, s->nb_streams * 16 + 8, 0x4403);
792     mxf_write_refs_count(pb, s->nb_streams);
793     for (i = 0; i < s->nb_streams; i++)
794         mxf_write_uuid(pb, type == MaterialPackage ? Track : Track + TypeBottom, i);
795
796     // write multiple descriptor reference
797     if (type == SourcePackage) {
798         mxf_write_local_tag(pb, 16, 0x4701);
799         if (s->nb_streams > 1) {
800             mxf_write_uuid(pb, MultipleDescriptor, 0);
801             mxf_write_multi_descriptor(s);
802         } else
803             mxf_write_uuid(pb, SubDescriptor, 0);
804     }
805
806     for (i = 0; i < s->nb_streams; i++) {
807         AVStream *st = s->streams[i];
808         mxf_write_track(s, st, type);
809         mxf_write_sequence(s, st, type);
810         mxf_write_structural_component(s, st, type);
811
812         if (type == SourcePackage) {
813             MXFStreamContext *sc = st->priv_data;
814             mxf_essence_container_uls[sc->index].write_desc(s, st);
815         }
816     }
817 }
818
819 static int mxf_write_essence_container_data(AVFormatContext *s)
820 {
821     ByteIOContext *pb = s->pb;
822
823     mxf_write_metadata_key(pb, 0x012300);
824     klv_encode_ber_length(pb, 72);
825
826     mxf_write_local_tag(pb, 16, 0x3C0A); // Instance UID
827     mxf_write_uuid(pb, EssenceContainerData, 0);
828
829     mxf_write_local_tag(pb, 32, 0x2701); // Linked Package UID
830     mxf_write_umid(pb, SourcePackage, 0);
831
832     mxf_write_local_tag(pb, 4, 0x3F07); // BodySID
833     put_be32(pb, 1);
834
835     mxf_write_local_tag(pb, 4, 0x3F06); // IndexSID
836     put_be32(pb, 2);
837
838     return 0;
839 }
840
841 static int mxf_write_header_metadata_sets(AVFormatContext *s)
842 {
843     mxf_write_preface(s);
844     mxf_write_identification(s);
845     mxf_write_content_storage(s);
846     mxf_write_package(s, MaterialPackage);
847     mxf_write_package(s, SourcePackage);
848     mxf_write_essence_container_data(s);
849     return 0;
850 }
851
852 static unsigned klv_fill_size(uint64_t size)
853 {
854     unsigned pad = KAG_SIZE - (size & (KAG_SIZE-1));
855     if (pad < 17) // smallest fill item possible
856         return pad + KAG_SIZE;
857     else
858         return pad & (KAG_SIZE-1);
859 }
860
861 static void mxf_write_index_table_segment(AVFormatContext *s)
862 {
863     MXFContext *mxf = s->priv_data;
864     ByteIOContext *pb = s->pb;
865     int i, j;
866     int temporal_reordering = 0;
867     int last_key_index = 0, key_index = 0;
868
869     av_log(s, AV_LOG_DEBUG, "edit units count %d\n", mxf->edit_units_count);
870
871     put_buffer(pb, index_table_segment_key, 16);
872     klv_encode_ber_length(pb, 109 + (s->nb_streams+1)*6 +
873                           mxf->edit_units_count*(11+mxf->slice_count*4));
874
875     // instance id
876     mxf_write_local_tag(pb, 16, 0x3C0A);
877     mxf_write_uuid(pb, IndexTableSegment, 0);
878
879     // index edit rate
880     mxf_write_local_tag(pb, 8, 0x3F0B);
881     put_be32(pb, mxf->time_base.num);
882     put_be32(pb, mxf->time_base.den);
883
884     // index start position
885     mxf_write_local_tag(pb, 8, 0x3F0C);
886     put_be64(pb, 0);
887
888     // index duration
889     mxf_write_local_tag(pb, 8, 0x3F0D);
890     put_be64(pb, mxf->edit_units_count);
891
892     // edit unit byte count
893     mxf_write_local_tag(pb, 4, 0x3F05);
894     put_be32(pb, 0);
895
896     // index sid
897     mxf_write_local_tag(pb, 4, 0x3F06);
898     put_be32(pb, 2);
899
900     // body sid
901     mxf_write_local_tag(pb, 4, 0x3F07);
902     put_be32(pb, 1);
903
904     // real slice count - 1
905     mxf_write_local_tag(pb, 1, 0x3F08);
906     put_byte(pb, mxf->slice_count);
907
908     // delta entry array
909     mxf_write_local_tag(pb, 8 + (s->nb_streams+1)*6, 0x3F09);
910     put_be32(pb, s->nb_streams+1); // num of entries
911     put_be32(pb, 6);             // size of one entry
912     // write system item delta entry
913     put_byte(pb, 0);
914     put_byte(pb, 0); // slice entry
915     put_be32(pb, 0); // element delta
916     for (i = 0; i < s->nb_streams; i++) {
917         AVStream *st = s->streams[i];
918         MXFStreamContext *sc = st->priv_data;
919         put_byte(pb, sc->temporal_reordering);
920         if (sc->temporal_reordering)
921             temporal_reordering = 1;
922         // slice number
923         if (i == 0) { // video track
924             put_byte(pb, 0); // slice number
925             put_be32(pb, KAG_SIZE); // system item size including klv fill
926         } else { // audio track
927             unsigned audio_frame_size = sc->aic.samples[0]*sc->aic.sample_size;
928             audio_frame_size += klv_fill_size(audio_frame_size);
929             put_byte(pb, 1);
930             put_be32(pb, (i-1)*audio_frame_size); // element delta
931         }
932     }
933
934     mxf_write_local_tag(pb, 8 + mxf->edit_units_count*(11+mxf->slice_count*4), 0x3F0A);
935     put_be32(pb, mxf->edit_units_count);  // num of entries
936     put_be32(pb, 11+mxf->slice_count*4);  // size of one entry
937     for (i = 0; i < mxf->edit_units_count; i++) {
938         if (temporal_reordering) {
939             int temporal_offset = 0;
940             for (j = i+1; j < mxf->edit_units_count; j++) {
941                 temporal_offset++;
942                 if (mxf->index_entries[j].flags & 0x10) { // backward prediction
943                     // next is not b, so is reordered
944                     if (!(mxf->index_entries[i+1].flags & 0x10)) {
945                         if ((mxf->index_entries[i].flags & 0x11) == 0) // i frame
946                             temporal_offset = 0;
947                         else
948                             temporal_offset = -temporal_offset;
949                     }
950                     break;
951                 }
952             }
953             put_byte(pb, temporal_offset);
954         } else
955             put_byte(pb, 0);
956         if (!(mxf->index_entries[i].flags & 0x33)) { // I frame
957             last_key_index = key_index;
958             key_index = i;
959         }
960         if (mxf->index_entries[i].flags & 0x10 && // backward prediction
961             !(mxf->index_entries[key_index].flags & 0x80)) { // open gop
962             put_byte(pb, last_key_index - i);
963         } else {
964             put_byte(pb, key_index - i); // key frame offset
965             if ((mxf->index_entries[i].flags & 0x20) == 0x20) // only forward
966                 last_key_index = key_index;
967         }
968         put_byte(pb, mxf->index_entries[i].flags);
969         // stream offset
970         put_be64(pb, mxf->index_entries[i].offset - mxf->index_entries[0].offset);
971         if (s->nb_streams > 1)
972             put_be32(pb, mxf->index_entries[i].slice_offset);
973     }
974 }
975
976 static void mxf_write_partition(AVFormatContext *s, int bodysid,
977                                 int indexsid, unsigned index_byte_count,
978                                 const uint8_t *key, int write_metadata)
979 {
980     MXFContext *mxf = s->priv_data;
981     ByteIOContext *pb = s->pb;
982     int64_t header_byte_count_offset;
983
984     // write klv
985     put_buffer(pb, key, 16);
986
987     klv_encode_ber_length(pb, 88 + 16 * mxf->essence_container_count);
988
989     // write partition value
990     put_be16(pb, 1); // majorVersion
991     put_be16(pb, 2); // minorVersion
992     put_be32(pb, KAG_SIZE); // KAGSize
993
994     put_be64(pb, url_ftell(pb) - 25); // thisPartition
995     put_be64(pb, 0); // previousPartition
996
997     put_be64(pb, mxf->footer_partition_offset); // footerPartition
998
999     // set offset
1000     header_byte_count_offset = url_ftell(pb);
1001     put_be64(pb, 0); // headerByteCount, update later
1002
1003     // indexTable
1004     put_be64(pb, index_byte_count); // indexByteCount
1005     put_be32(pb, indexsid); // indexSID
1006     put_be64(pb, 0); // bodyOffset
1007
1008     put_be32(pb, bodysid); // bodySID
1009
1010     // operational pattern
1011     if (s->nb_streams > 1) {
1012         put_buffer(pb, op1a_ul, 14);
1013         put_be16(pb, 0x0900); // multi track
1014     } else {
1015         put_buffer(pb, op1a_ul, 16);
1016     }
1017
1018     // essence container
1019     mxf_write_essence_container_refs(s);
1020
1021     if (write_metadata) {
1022         // mark the start of the headermetadata and calculate metadata size
1023         int64_t pos, start = url_ftell(s->pb);
1024         unsigned header_byte_count;
1025
1026         mxf_write_primer_pack(s);
1027         mxf_write_header_metadata_sets(s);
1028         pos = url_ftell(s->pb);
1029         header_byte_count = pos - start + klv_fill_size(pos);
1030
1031         // update header_byte_count
1032         url_fseek(pb, header_byte_count_offset, SEEK_SET);
1033         put_be64(pb, header_byte_count);
1034         url_fseek(pb, pos, SEEK_SET);
1035     }
1036
1037     put_flush_packet(pb);
1038 }
1039
1040 static const UID mxf_mpeg2_codec_uls[] = {
1041     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x10,0x00 }, // MP-ML I-Frame
1042     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, // MP-ML Long GOP
1043     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, // 422P-ML I-Frame
1044     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, // 422P-ML Long GOP
1045     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x02,0x00 }, // MP-HL I-Frame
1046     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, // MP-HL Long GOP
1047     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, // 422P-HL I-Frame
1048     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, // 422P-HL Long GOP
1049 };
1050
1051 static const UID *mxf_get_mpeg2_codec_ul(AVCodecContext *avctx)
1052 {
1053     if (avctx->profile == 4) { // Main
1054         if (avctx->level == 8) // Main
1055             return avctx->gop_size ?
1056                 &mxf_mpeg2_codec_uls[1] :
1057                 &mxf_mpeg2_codec_uls[0];
1058         else if (avctx->level == 4) // High
1059             return avctx->gop_size ?
1060                 &mxf_mpeg2_codec_uls[5] :
1061                 &mxf_mpeg2_codec_uls[4];
1062     } else if (avctx->profile == 0) { // 422
1063         if (avctx->level == 5) // Main
1064             return avctx->gop_size ?
1065                 &mxf_mpeg2_codec_uls[3] :
1066                 &mxf_mpeg2_codec_uls[2];
1067         else if (avctx->level == 2) // High
1068             return avctx->gop_size ?
1069                 &mxf_mpeg2_codec_uls[7] :
1070                 &mxf_mpeg2_codec_uls[6];
1071     }
1072     return NULL;
1073 }
1074
1075 static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1076 {
1077     MXFContext *mxf = s->priv_data;
1078     MXFStreamContext *sc = st->priv_data;
1079     uint32_t c = -1;
1080     int i;
1081
1082     mxf->index_entries[mxf->edit_units_count].flags = 0;
1083
1084     for(i = 0; i < pkt->size - 4; i++) {
1085         c = (c<<8) + pkt->data[i];
1086         if (c == 0x1B5) {
1087             if (i + 2 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x10) { // seq ext
1088                 st->codec->profile = pkt->data[i+1] & 0x07;
1089                 st->codec->level   = pkt->data[i+2] >> 4;
1090             } else if (i + 5 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x80) { // pict coding ext
1091                 sc->interlaced = !(pkt->data[i+5] & 0x80); // progressive frame
1092                 break;
1093             }
1094         } else if (c == 0x1b8) { // gop
1095             if (i + 4 < pkt->size && pkt->data[i+4]>>6 & 0x01) // closed
1096                 mxf->index_entries[mxf->edit_units_count].flags |= 0x80; // random access
1097         } else if (c == 0x1b3) { // seq
1098             mxf->index_entries[mxf->edit_units_count].flags |= 0x40;
1099         } else if (c == 0x100) { // pic
1100             int pict_type = (pkt->data[i+2]>>3) & 0x07;
1101             if (pict_type == 2) { // P frame
1102                 mxf->index_entries[mxf->edit_units_count].flags |= 0x22;
1103                 st->codec->gop_size = 1;
1104             } else if (pict_type == 3) { // B frame
1105                 mxf->index_entries[mxf->edit_units_count].flags |= 0x33;
1106                 sc->temporal_reordering = -1;
1107             } else if (!pict_type) {
1108                 av_log(s, AV_LOG_ERROR, "error parsing mpeg2 frame\n");
1109                 return 0;
1110             }
1111         }
1112     }
1113     sc->codec_ul = mxf_get_mpeg2_codec_ul(st->codec);
1114     return !!sc->codec_ul;
1115 }
1116
1117 static uint64_t mxf_parse_timestamp(time_t timestamp)
1118 {
1119     struct tm *time = localtime(&timestamp);
1120     return (uint64_t)(time->tm_year+1900) << 48 |
1121            (uint64_t)(time->tm_mon+1)     << 40 |
1122            (uint64_t) time->tm_mday       << 32 |
1123                       time->tm_hour       << 24 |
1124                       time->tm_min        << 16 |
1125                       time->tm_sec        << 8;
1126 }
1127
1128 static int mxf_write_header(AVFormatContext *s)
1129 {
1130     MXFContext *mxf = s->priv_data;
1131     int i;
1132     uint8_t present[FF_ARRAY_ELEMS(mxf_essence_container_uls)] = {0};
1133     const int *samples_per_frame = NULL;
1134
1135     if (s->nb_streams > 17) {
1136         av_log(s, AV_LOG_ERROR, "error, mxf muxer supports 17 tracks maximum\n");
1137         return -1;
1138     }
1139
1140     for (i = 0; i < s->nb_streams; i++) {
1141         AVStream *st = s->streams[i];
1142         MXFStreamContext *sc = av_mallocz(sizeof(*sc));
1143         if (!sc)
1144             return AVERROR(ENOMEM);
1145         st->priv_data = sc;
1146
1147         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
1148             if (i != 0) {
1149                 av_log(s, AV_LOG_ERROR, "video stream must be first track\n");
1150                 return -1;
1151             }
1152             if (fabs(av_q2d(st->codec->time_base) - 1/25.0) < 0.0001) {
1153                 samples_per_frame = PAL_samples_per_frame;
1154                 mxf->time_base = (AVRational){ 1, 25 };
1155             } else if (fabs(av_q2d(st->codec->time_base) - 1001/30000.0) < 0.0001) {
1156                 samples_per_frame = NTSC_samples_per_frame;
1157                 mxf->time_base = (AVRational){ 1001, 30000 };
1158             } else {
1159                 av_log(s, AV_LOG_ERROR, "unsupported video frame rate\n");
1160                 return -1;
1161             }
1162             av_set_pts_info(st, 64, mxf->time_base.num, mxf->time_base.den);
1163         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
1164             if (st->codec->sample_rate != 48000) {
1165                 av_log(s, AV_LOG_ERROR, "only 48khz is implemented\n");
1166                 return -1;
1167             }
1168             av_set_pts_info(st, 64, 1, st->codec->sample_rate);
1169             mxf->slice_count = 1;
1170         }
1171         sc->duration = -1;
1172
1173         sc->index = mxf_get_essence_container_ul_index(st->codec->codec_id);
1174         if (sc->index == -1) {
1175             av_log(s, AV_LOG_ERROR, "track %d: could not find essence container ul, "
1176                    "codec not currently supported in container\n", i);
1177             return -1;
1178         }
1179
1180         sc->codec_ul = &mxf_essence_container_uls[sc->index].codec_ul;
1181
1182         if (!present[sc->index]) {
1183             mxf->essence_containers_indices[mxf->essence_container_count++] = sc->index;
1184             present[sc->index] = 1;
1185         } else
1186             present[sc->index]++;
1187         memcpy(sc->track_essence_element_key, mxf_essence_container_uls[sc->index].element_ul, 15);
1188         sc->track_essence_element_key[15] = present[sc->index];
1189         PRINT_KEY(s, "track essence element key", sc->track_essence_element_key);
1190     }
1191
1192     for (i = 0; i < s->nb_streams; i++) {
1193         MXFStreamContext *sc = s->streams[i]->priv_data;
1194         // update element count
1195         sc->track_essence_element_key[13] = present[sc->index];
1196         sc->order = AV_RB32(sc->track_essence_element_key+12);
1197     }
1198
1199     mxf->timestamp = mxf_parse_timestamp(s->timestamp);
1200
1201     if (!samples_per_frame)
1202         samples_per_frame = PAL_samples_per_frame;
1203
1204     if (ff_audio_interleave_init(s, samples_per_frame, mxf->time_base) < 0)
1205         return -1;
1206
1207     return 0;
1208 }
1209
1210 static void mxf_write_klv_fill(AVFormatContext *s)
1211 {
1212     unsigned pad = klv_fill_size(url_ftell(s->pb));
1213     if (pad) {
1214         put_buffer(s->pb, klv_fill_key, 16);
1215         pad -= 16;
1216         pad -= klv_ber_length(pad);
1217         klv_encode_ber_length(s->pb, pad);
1218         for (; pad > 7; pad -= 8)
1219             put_be64(s->pb, 0);
1220         for (; pad; pad--)
1221             put_byte(s->pb, 0);
1222         assert(!(url_ftell(s->pb) & (KAG_SIZE-1)));
1223     }
1224 }
1225
1226 static const uint8_t system_metadata_pack_key[]        = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x03,0x01,0x04,0x01,0x01,0x00 };
1227 static const uint8_t system_metadata_package_set_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x43,0x01,0x01,0x0D,0x01,0x03,0x01,0x04,0x01,0x02,0x01 };
1228
1229 static uint32_t ff_framenum_to_12m_time_code(unsigned frame, int drop, int fps)
1230 {
1231     return (0                                    << 31) | // color frame flag
1232            (0                                    << 30) | // drop  frame flag
1233            ( ((frame % fps) / 10)                << 28) | // tens  of frames
1234            ( ((frame % fps) % 10)                << 24) | // units of frames
1235            (0                                    << 23) | // field phase (NTSC), b0 (PAL)
1236            ((((frame / fps) % 60) / 10)          << 20) | // tens  of seconds
1237            ((((frame / fps) % 60) % 10)          << 16) | // units of seconds
1238            (0                                    << 15) | // b0 (NTSC), b2 (PAL)
1239            ((((frame / (fps * 60)) % 60) / 10)   << 12) | // tens  of minutes
1240            ((((frame / (fps * 60)) % 60) % 10)   <<  8) | // units of minutes
1241            (0                                    <<  7) | // b1
1242            (0                                    <<  6) | // b2 (NSC), field phase (PAL)
1243            ((((frame / (fps * 3600) % 24)) / 10) <<  4) | // tens  of hours
1244            (  (frame / (fps * 3600) % 24)) % 10;          // units of hours
1245 }
1246
1247 static void mxf_write_system_item(AVFormatContext *s)
1248 {
1249     MXFContext *mxf = s->priv_data;
1250     ByteIOContext *pb = s->pb;
1251     unsigned fps, frame;
1252     uint32_t time_code;
1253
1254     frame = mxf->edit_units_count;
1255
1256     // write system metadata pack
1257     put_buffer(pb, system_metadata_pack_key, 16);
1258     klv_encode_ber_length(pb, 57);
1259     put_byte(pb, 0x5c); // UL, user date/time stamp, picture and sound item present
1260     put_byte(pb, 0x04); // content package rate
1261     put_byte(pb, 0x00); // content package type
1262     put_be16(pb, 0x00); // channel handle
1263     put_be16(pb, frame); // continuity count
1264     if (mxf->essence_container_count > 1)
1265         put_buffer(pb, multiple_desc_ul, 16);
1266     else
1267         put_buffer(pb, mxf_essence_container_uls[mxf->essence_containers_indices[0]].container_ul, 16);
1268     put_byte(pb, 0);
1269     put_be64(pb, 0);
1270     put_be64(pb, 0); // creation date/time stamp
1271
1272     // XXX drop frame
1273     if (mxf->time_base.den == 30000) fps = 30;
1274     else                             fps = 25;
1275
1276     put_byte(pb, 0x81); // SMPTE 12M time code
1277     time_code = ff_framenum_to_12m_time_code(frame, 0, fps);
1278     put_be32(pb, time_code);
1279     put_be32(pb, 0); // binary group data
1280     put_be64(pb, 0);
1281
1282     // write system metadata package set
1283     put_buffer(pb, system_metadata_package_set_key, 16);
1284     klv_encode_ber_length(pb, 35);
1285     put_byte(pb, 0x83); // UMID
1286     put_be16(pb, 0x20);
1287     mxf_write_umid(pb, SourcePackage, 0);
1288 }
1289
1290 static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)
1291 {
1292     MXFContext *mxf = s->priv_data;
1293     ByteIOContext *pb = s->pb;
1294     AVStream *st = s->streams[pkt->stream_index];
1295     MXFStreamContext *sc = st->priv_data;
1296
1297     if (!(mxf->edit_units_count % MXF_INDEX_CLUSTER_SIZE)) {
1298         mxf->index_entries = av_realloc(mxf->index_entries,
1299             (mxf->edit_units_count + MXF_INDEX_CLUSTER_SIZE)*
1300              sizeof(*mxf->index_entries));
1301         if (!mxf->index_entries) {
1302             av_log(s, AV_LOG_ERROR, "could not allocate index entries\n");
1303             return -1;
1304         }
1305     }
1306
1307     if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
1308         if (!mxf_parse_mpeg2_frame(s, st, pkt)) {
1309             av_log(s, AV_LOG_ERROR, "could not get mpeg2 profile and level\n");
1310             return -1;
1311         }
1312     }
1313
1314     if (!mxf->header_written) {
1315         mxf_write_partition(s, 1, 0, 0, header_open_partition_key, 1);
1316         mxf->header_written = 1;
1317     }
1318
1319     mxf_write_klv_fill(s);
1320
1321     if (st->index == 0) {
1322         mxf->index_entries[mxf->edit_units_count].offset = url_ftell(pb);
1323
1324         mxf_write_system_item(s);
1325         mxf_write_klv_fill(s);
1326
1327         mxf->edit_units_count++;
1328     } else if (st->index == 1) {
1329         mxf->index_entries[mxf->edit_units_count-1].slice_offset =
1330             url_ftell(pb) - mxf->index_entries[mxf->edit_units_count-1].offset;
1331     }
1332
1333     put_buffer(pb, sc->track_essence_element_key, 16); // write key
1334     klv_encode_ber_length(pb, pkt->size); // write length
1335     put_buffer(pb, pkt->data, pkt->size); // write value
1336
1337     sc->duration = FFMAX(pkt->pts + pkt->duration, sc->duration);
1338
1339     put_flush_packet(pb);
1340     return 0;
1341 }
1342
1343 static void mxf_write_random_index_pack(AVFormatContext *s)
1344 {
1345     MXFContext *mxf = s->priv_data;
1346     ByteIOContext *pb = s->pb;
1347     uint64_t pos = url_ftell(pb);
1348
1349     put_buffer(pb, random_index_pack_key, 16);
1350     klv_encode_ber_length(pb, 28);
1351
1352     put_be32(pb, 1); // BodySID of header partition
1353     put_be64(pb, 0); // offset of header partition
1354
1355     put_be32(pb, 0); // BodySID of footer partition
1356     put_be64(pb, mxf->footer_partition_offset);
1357
1358     put_be32(pb, url_ftell(pb) - pos + 4);
1359 }
1360
1361 static int mxf_write_footer(AVFormatContext *s)
1362 {
1363     MXFContext *mxf = s->priv_data;
1364     ByteIOContext *pb = s->pb;
1365     unsigned index_byte_count =
1366         109 + (s->nb_streams+1)*6 +
1367         mxf->edit_units_count*(11+mxf->slice_count*4);
1368
1369     // add encoded ber length
1370     index_byte_count += 16 + klv_ber_length(index_byte_count);
1371
1372     mxf_write_klv_fill(s);
1373
1374     mxf->footer_partition_offset = url_ftell(pb);
1375     mxf_write_partition(s, 0, 2, index_byte_count, footer_partition_key, 0);
1376
1377     mxf_write_index_table_segment(s);
1378
1379     mxf_write_random_index_pack(s);
1380
1381     if (!url_is_streamed(s->pb)) {
1382         url_fseek(pb, 0, SEEK_SET);
1383         mxf_write_partition(s, 1, 0, 0, header_closed_partition_key, 1);
1384     }
1385
1386     ff_audio_interleave_close(s);
1387
1388     av_freep(&mxf->index_entries);
1389
1390     mxf_free(s);
1391     return 0;
1392 }
1393
1394 static int mxf_interleave_get_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
1395 {
1396     AVPacketList *pktl;
1397     int stream_count = 0;
1398     int streams[MAX_STREAMS];
1399
1400     memset(streams, 0, sizeof(streams));
1401     pktl = s->packet_buffer;
1402     while (pktl) {
1403         //av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);
1404         if (!streams[pktl->pkt.stream_index])
1405             stream_count++;
1406         streams[pktl->pkt.stream_index]++;
1407         pktl = pktl->next;
1408     }
1409
1410     if (stream_count && (s->nb_streams == stream_count || flush)) {
1411         pktl = s->packet_buffer;
1412         if (s->nb_streams != stream_count) {
1413             AVPacketList *first = NULL;
1414             // find first packet in edit unit
1415             while (pktl) {
1416                 AVStream *st = s->streams[pktl->pkt.stream_index];
1417                 if (st->index == 0)
1418                     break;
1419                 else if (!first)
1420                     first = pktl;
1421                 pktl = pktl->next;
1422             }
1423             // purge packet queue
1424             while (pktl) {
1425                 AVPacketList *next = pktl->next;
1426                 av_free_packet(&pktl->pkt);
1427                 av_freep(&pktl);
1428                 pktl = next;
1429             }
1430             if (!first)
1431                 goto out;
1432             pktl = first;
1433         }
1434
1435         *out = pktl->pkt;
1436         //av_log(s, AV_LOG_DEBUG, "out st:%d dts:%lld\n", (*out).stream_index, (*out).dts);
1437         s->packet_buffer = pktl->next;
1438         av_freep(&pktl);
1439         return 1;
1440     } else {
1441     out:
1442         av_init_packet(out);
1443         return 0;
1444     }
1445 }
1446
1447 static int mxf_compare_timestamps(AVFormatContext *s, AVPacket *next, AVPacket *pkt)
1448 {
1449     MXFStreamContext *sc  = s->streams[pkt ->stream_index]->priv_data;
1450     MXFStreamContext *sc2 = s->streams[next->stream_index]->priv_data;
1451
1452     return next->dts > pkt->dts ||
1453         (next->dts == pkt->dts && sc->order < sc2->order);
1454 }
1455
1456 static int mxf_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
1457 {
1458     return ff_audio_rechunk_interleave(s, out, pkt, flush,
1459                                mxf_interleave_get_packet, mxf_compare_timestamps);
1460 }
1461
1462 AVOutputFormat mxf_muxer = {
1463     "mxf",
1464     NULL_IF_CONFIG_SMALL("Material eXchange Format"),
1465     NULL,
1466     "mxf",
1467     sizeof(MXFContext),
1468     CODEC_ID_PCM_S16LE,
1469     CODEC_ID_MPEG2VIDEO,
1470     mxf_write_header,
1471     mxf_write_packet,
1472     mxf_write_footer,
1473     AVFMT_NOTIMESTAMPS,
1474     NULL,
1475     mxf_interleave,
1476 };