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FFmpeg/libavformat/mxf.c

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  1. /*

  2.  * MXF demuxer.

  3.  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.

  4.  *

  5.  * This library is free software; you can redistribute it and/or

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

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

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

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

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

  13.  * Lesser General Public License for more details.

  14.  *

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

  16.  * License along with this library; if not, write to the Free Software

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

  18.  */

  19. 

  20. /*

  21.  * References

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

  23.  * SMPTE 377M MXF File Format Specifications

  24.  * SMPTE 378M Operational Pattern 1a

  25.  * SMPTE 379M MXF Generic Container

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

  27.  * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container

  28.  * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container

  29.  *

  30.  * Principle

  31.  * Search for Track numbers which will identify essence element KLV packets.

  32.  * Search for SourcePackage which define tracks which contains Track numbers.

  33.  * Material Package contains tracks with reference to SourcePackage tracks.

  34.  * Search for Descriptors (Picture, Sound) which contains codec info and parameters.

  35.  * Assign Descriptors to correct Tracks.

  36.  *

  37.  * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) and then resolve Strong Reference from another object.

  38.  * Returns -1 if Strong Reference could not be resolved.

  39.  *

  40.  * Simple demuxer, only OP1A supported and some files might not work at all.

  41.  * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1

  42.  * Only descriptors with EssenceSoundCompression or PictureEssenceCoding will be taken into account. "D/req" SMPTE 377M

  43.  */

  44. 

  45. //#define DEBUG

  46. 

  47. #include "avformat.h"

  48. 

  49. typedef uint8_t UID[16];

  50. 

  51. enum MXFPackageType {

  52.     MaterialPackage,

  53.     SourcePackage,

  54. };

  55. 

  56. enum MXFStructuralComponentType {

  57.     Timecode,

  58.     SourceClip,

  59. };

  60. 

  61. typedef struct MXFStructuralComponent {

  62.     UID uid;

  63.     UID source_package_uid;

  64.     UID data_definition_ul;

  65.     int64_t duration;

  66.     int64_t start_position;

  67.     int source_track_id;

  68.     enum MXFStructuralComponentType type;

  69. } MXFStructuralComponent;

  70. 

  71. typedef struct MXFSequence {

  72.     UID uid;

  73.     UID data_definition_ul;

  74.     MXFStructuralComponent **structural_components;

  75.     UID *structural_components_refs;

  76.     int structural_components_count;

  77.     int64_t duration;

  78. } MXFSequence;

  79. 

  80. typedef struct MXFTrack {

  81.     UID uid;

  82.     MXFSequence *sequence; /* mandatory, and only one */

  83.     UID sequence_ref;

  84.     int track_id;

  85.     uint8_t track_number[4];

  86.     AVRational edit_rate;

  87. } MXFTrack;

  88. 

  89. typedef struct MXFDescriptor {

  90.     UID uid;

  91.     UID essence_container_ul;

  92.     UID essence_codec_ul;

  93.     AVRational sample_rate;

  94.     AVRational aspect_ratio;

  95.     int width;

  96.     int height;

  97.     int channels;

  98.     int bits_per_sample;

  99.     struct MXFDescriptor **sub_descriptors;

  100.     UID *sub_descriptors_refs;

  101.     int sub_descriptors_count;

  102.     int linked_track_id;

  103. } MXFDescriptor;

  104. 

  105. typedef struct MXFPackage {

  106.     UID uid;

  107.     UID package_uid;

  108.     MXFTrack **tracks;

  109.     UID *tracks_refs;

  110.     int tracks_count;

  111.     MXFDescriptor *descriptor; /* only one */

  112.     UID descriptor_ref;

  113.     enum MXFPackageType type;

  114. } MXFPackage;

  115. 

  116. typedef struct MXFEssenceContainerData {

  117.     UID uid;

  118.     UID linked_package_uid;

  119. } MXFEssenceContainerData;

  120. 

  121. typedef struct MXFContext {

  122.     MXFPackage **packages;

  123.     UID *packages_refs;

  124.     int packages_count;

  125.     MXFEssenceContainerData **essence_container_data_sets;

  126.     UID *essence_container_data_sets_refs;

  127.     int essence_container_data_sets_count;

  128.     UID *essence_containers_uls; /* Universal Labels SMPTE RP224 */

  129.     int essence_containers_uls_count;

  130.     UID operational_pattern_ul;

  131.     UID content_storage_uid;

  132.     AVFormatContext *fc;

  133. } MXFContext;

  134. 

  135. typedef struct KLVPacket {

  136.     UID key;

  137.     offset_t offset;

  138.     uint64_t length;

  139. } KLVPacket;

  140. 

  141. typedef struct MXFCodecUL {

  142.     UID uid;

  143.     enum CodecID id;

  144. } MXFCodecUL;

  145. 

  146. static const UID mxf_metadata_preface_key                  = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2F,0x00 };

  147. static const UID mxf_metadata_content_storage_key          = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 };

  148. static const UID mxf_metadata_source_package_key           = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 };

  149. static const UID mxf_metadata_material_package_key         = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 };

  150. static const UID mxf_metadata_sequence_key                 = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 };

  151. static const UID mxf_metadata_source_clip_key              = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 };

  152. static const UID mxf_metadata_multiple_descriptor_key      = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 };

  153. static const UID mxf_metadata_generic_sound_descriptor_key = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 };

  154. static const UID mxf_metadata_cdci_descriptor_key          = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 };

  155. static const UID mxf_metadata_rgba_descriptor_key          = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 };

  156. static const UID mxf_metadata_mpegvideo_descriptor_key     = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 };

  157. static const UID mxf_metadata_wave_descriptor_key          = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 };

  158. static const UID mxf_metadata_static_track_key             = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 };

  159. static const UID mxf_metadata_track_key                    = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3b,0x00 };

  160. 

  161. /* partial keys to match */

  162. static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };

  163. static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };

  164. 

  165. #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))

  166. 

  167. #define PRINT_KEY(x) dprintf("%02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n", \

  168.                              x[0], x[1], x[2], x[3], x[4], x[5], x[6], x[7], x[8], x[9], x[10], x[11], x[12], x[13], x[14], x[15])

  169. 

  170. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  171. {

  172.     int64_t size = 0;

  173.     uint8_t length = get_byte(pb);

  174.     int type = length >> 7;

  175. 

  176.     if (type) { /* long form */

  177.         int bytes_num = length & 0x7f;

  178.         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */

  179.         if (bytes_num > 8)

  180.             return -1;

  181.         while (bytes_num--)

  182.             size = size << 8 | get_byte(pb);

  183.     } else {

  184.         size = length & 0x7f;

  185.     }

  186.     return size;

  187. }

  188. 

  189. static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)

  190. {

  191.     klv->offset = url_ftell(pb);

  192.     get_buffer(pb, klv->key, 16);

  193.     klv->length = klv_decode_ber_length(pb);

  194.     return klv->length == -1 ? -1 : 0;

  195. }

  196. 

  197. static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)

  198. {

  199.     int i;

  200. 

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

  202.         MXFTrack *track = s->streams[i]->priv_data;

  203.          /* SMPTE 379M 7.3 */

  204.         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))

  205.             return i;

  206.     }

  207.     return -1;

  208. }

  209. 

  210. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  211. {

  212.     KLVPacket klv;

  213. 

  214.     while (!url_feof(&s->pb)) {

  215.         if (klv_read_packet(&klv, &s->pb) < 0) {

  216.             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");

  217.             return -1;

  218.         }

  219. #ifdef DEBUG

  220.         PRINT_KEY(klv.key);

  221. #endif

  222.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

  223.             av_get_packet(&s->pb, pkt, klv.length);

  224.             pkt->stream_index = mxf_get_stream_index(s, &klv);

  225.             return pkt->stream_index == -1 ? -1 : 0;

  226.         } else

  227.             url_fskip(&s->pb, klv.length);

  228.     }

  229.     return AVERROR_IO;

  230. }

  231. 

  232. static int mxf_read_metadata_preface(MXFContext *mxf, KLVPacket *klv)

  233. {

  234.     ByteIOContext *pb = &mxf->fc->pb;

  235.     int bytes_read = 0;

  236. 

  237.     while (bytes_read < klv->length) {

  238.         int tag = get_be16(pb);

  239.         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */

  240. 

  241.         switch (tag) {

  242.         case 0x3B03:

  243.             get_buffer(pb, mxf->content_storage_uid, 16);

  244.             break;

  245.         case 0x3B09:

  246.             get_buffer(pb, mxf->operational_pattern_ul, 16);

  247.             break;

  248.         case 0x3B0A:

  249.             mxf->essence_containers_uls_count = get_be32(pb);

  250.             if (mxf->essence_containers_uls_count >= UINT_MAX / sizeof(UID))

  251.                 return -1;

  252.             mxf->essence_containers_uls = av_malloc(mxf->essence_containers_uls_count * sizeof(UID));

  253.             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  254.             get_buffer(pb, mxf->essence_containers_uls, mxf->essence_containers_uls_count * sizeof(UID));

  255.             break;

  256.         default:

  257.             url_fskip(pb, size);

  258.         }

  259.         bytes_read += size + 4;

  260.     }

  261.     return 0;

  262. }

  263. 

  264. static int mxf_read_metadata_content_storage(MXFContext *mxf, KLVPacket *klv)

  265. {

  266.     ByteIOContext *pb = &mxf->fc->pb;

  267.     int bytes_read = 0;

  268. 

  269.     while (bytes_read < klv->length) {

  270.         int tag = get_be16(pb);

  271.         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */

  272. 

  273.         dprintf("tag 0x%04X, size %d\n", tag, size);

  274.         switch (tag) {

  275.         case 0x1901:

  276.             mxf->packages_count = get_be32(pb);

  277.             if (mxf->packages_count >= UINT_MAX / sizeof(UID) ||

  278.                 mxf->packages_count >= UINT_MAX / sizeof(*mxf->packages))

  279.                 return -1;

  280.             mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));

  281.             mxf->packages = av_mallocz(mxf->packages_count * sizeof(*mxf->packages));

  282.             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  283.             get_buffer(pb, mxf->packages_refs, mxf->packages_count * sizeof(UID));

  284.             break;

  285.         case 0x1902:

  286.             mxf->essence_container_data_sets_count = get_be32(pb);

  287.             if (mxf->essence_container_data_sets_count >= UINT_MAX / sizeof(UID) ||

  288.                 mxf->essence_container_data_sets_count >= UINT_MAX / sizeof(*mxf->essence_container_data_sets))

  289.                 return -1;

  290.             mxf->essence_container_data_sets_refs = av_malloc(mxf->essence_container_data_sets_count * sizeof(UID));

  291.             mxf->essence_container_data_sets = av_mallocz(mxf->essence_container_data_sets_count * sizeof(*mxf->essence_container_data_sets));

  292.             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  293.             get_buffer(pb, mxf->essence_container_data_sets_refs, mxf->essence_container_data_sets_count * sizeof(UID));

  294.             break;

  295.         default:

  296.             url_fskip(pb, size);

  297.         }

  298.         bytes_read += size + 4;

  299.     }

  300.     return 0;

  301. }

  302. 

  303. static int mxf_read_metadata_source_clip(MXFContext *mxf, KLVPacket *klv)

  304. {

  305.     ByteIOContext *pb = &mxf->fc->pb;

  306.     MXFStructuralComponent *source_clip = av_mallocz(sizeof(*source_clip));

  307.     int bytes_read = 0;

  308.     int i, j, k;

  309. 

  310.     source_clip->type = SourceClip;

  311.     while (bytes_read < klv->length) {

  312.         int tag = get_be16(pb);

  313.         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */

  314. 

  315.         dprintf("tag 0x%04X, size %d\n", tag, size);

  316.         switch (tag) {

  317.         case 0x3C0A:

  318.             get_buffer(pb, source_clip->uid, 16);

  319.             break;

  320.         case 0x0202:

  321.             source_clip->duration = get_be64(pb);

  322.             break;

  323.         case 0x1201:

  324.             source_clip->start_position = get_be64(pb);

  325.             break;

  326.         case 0x1101:

  327.             /* UMID, only get last 16 bytes */

  328.             url_fskip(pb, 16);

  329.             get_buffer(pb, source_clip->source_package_uid, 16);

  330.             break;

  331.         case 0x1102:

  332.             source_clip->source_track_id = get_be32(pb);

  333.             break;

  334.         default:

  335.             url_fskip(pb, size);

  336.         }

  337.         bytes_read += size + 4;

  338.     }

  339.     for (i = 0; i < mxf->packages_count; i++) {

  340.         if (mxf->packages[i]) {

  341.             for (j = 0; j < mxf->packages[i]->tracks_count; j++) {

  342.                 if (mxf->packages[i]->tracks[j] && mxf->packages[i]->tracks[j]->sequence) {

  343.                     for (k = 0; k < mxf->packages[i]->tracks[j]->sequence->structural_components_count; k++) {

  344.                         if (!memcmp(mxf->packages[i]->tracks[j]->sequence->structural_components_refs[k], source_clip->uid, 16)) {

  345.                             mxf->packages[i]->tracks[j]->sequence->structural_components[k] = source_clip;

  346.                             return 0;

  347.                         }

  348.                     }

  349.                 }

  350.             }

  351.         }

  352.     }

  353.     return -1;

  354. }

  355. 

  356. static int mxf_read_metadata_material_package(MXFContext *mxf, KLVPacket *klv)

  357. {

  358.     ByteIOContext *pb = &mxf->fc->pb;

  359.     MXFPackage *package = av_mallocz(sizeof(*package));

  360.     int bytes_read = 0;

  361.     int i;

  362. 

  363.     package->type = MaterialPackage;

  364.     while (bytes_read < klv->length) {

  365.         int tag = get_be16(pb);

  366.         int size = get_be16(pb); /* KLV specified by 0x53 */

  367. 

  368.         switch (tag) {

  369.         case 0x3C0A:

  370.             get_buffer(pb, package->uid, 16);

  371.             break;

  372.         case 0x4403:

  373.             package->tracks_count = get_be32(pb);

  374.             if (package->tracks_count >= UINT_MAX / sizeof(UID) ||

  375.                 package->tracks_count >= UINT_MAX / sizeof(*package->tracks))

  376.                 return -1;

  377.             package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));

  378.             package->tracks = av_mallocz(package->tracks_count * sizeof(*package->tracks));

  379.             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  380.             get_buffer(pb, package->tracks_refs, package->tracks_count * sizeof(UID));

  381.             break;

  382.         default:

  383.             url_fskip(pb, size);

  384.         }

  385.         bytes_read += size + 4;

  386.     }

  387.     for (i = 0; i < mxf->packages_count; i++) {

  388.         if (!memcmp(mxf->packages_refs[i], package->uid, 16)) {

  389.             mxf->packages[i] = package;

  390.             return 0;

  391.         }

  392.     }

  393.     return -1;

  394. }

  395. 

  396. static int mxf_read_metadata_track(MXFContext *mxf, KLVPacket *klv)

  397. {

  398.     ByteIOContext *pb = &mxf->fc->pb;

  399.     MXFTrack *track = av_mallocz(sizeof(*track));

  400.     int bytes_read = 0;

  401.     int i, j;

  402. 

  403.     while (bytes_read < klv->length) {

  404.         int tag = get_be16(pb);

  405.         int size = get_be16(pb); /* KLV specified by 0x53 */

  406. 

  407.         dprintf("tag 0x%04X, size %d\n", tag, size);

  408.         switch (tag) {

  409.         case 0x3C0A:

  410.             get_buffer(pb, track->uid, 16);

  411.             break;

  412.         case 0x4801:

  413.             track->track_id = get_be32(pb);

  414.             break;

  415.         case 0x4804:

  416.             get_buffer(pb, track->track_number, 4);

  417.             break;

  418.         case 0x4B01:

  419.             track->edit_rate.den = get_be32(pb);

  420.             track->edit_rate.num = get_be32(pb);

  421.             break;

  422.         case 0x4803:

  423.             get_buffer(pb, track->sequence_ref, 16);

  424.             break;

  425.         default:

  426.             url_fskip(pb, size);

  427.         }

  428.         bytes_read += size + 4;

  429.     }

  430.     for (i = 0; i < mxf->packages_count; i++) {

  431.         if (mxf->packages[i]) {

  432.             for (j = 0; j < mxf->packages[i]->tracks_count; j++) {

  433.                 if (!memcmp(mxf->packages[i]->tracks_refs[j], track->uid, 16)) {

  434.                     mxf->packages[i]->tracks[j] = track;

  435.                     return 0;

  436.                 }

  437.             }

  438.         }

  439.     }

  440.     return -1;

  441. }

  442. 

  443. static int mxf_read_metadata_sequence(MXFContext *mxf, KLVPacket *klv)

  444. {

  445.     ByteIOContext *pb = &mxf->fc->pb;

  446.     MXFSequence *sequence = av_mallocz(sizeof(*sequence));

  447.     int bytes_read = 0;

  448.     int i, j;

  449. 

  450.     while (bytes_read < klv->length) {

  451.         int tag = get_be16(pb);

  452.         int size = get_be16(pb); /* KLV specified by 0x53 */

  453. 

  454.         dprintf("tag 0x%04X, size %d\n", tag, size);

  455.         switch (tag) {

  456.         case 0x3C0A:

  457.             get_buffer(pb, sequence->uid, 16);

  458.             break;

  459.         case 0x0202:

  460.             sequence->duration = get_be64(pb);

  461.             break;

  462.         case 0x0201:

  463.             get_buffer(pb, sequence->data_definition_ul, 16);

  464.             break;

  465.         case 0x1001:

  466.             sequence->structural_components_count = get_be32(pb);

  467.             if (sequence->structural_components_count >= UINT_MAX / sizeof(UID) ||

  468.                 sequence->structural_components_count >= UINT_MAX / sizeof(*sequence->structural_components))

  469.                 return -1;

  470.             sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));

  471.             sequence->structural_components = av_mallocz(sequence->structural_components_count * sizeof(*sequence->structural_components));

  472.             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  473.             get_buffer(pb, sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));

  474.             break;

  475.         default:

  476.             url_fskip(pb, size);

  477.         }

  478.         bytes_read += size + 4;

  479.     }

  480.     for (i = 0; i < mxf->packages_count; i++) {

  481.         if (mxf->packages[i]) {

  482.             for (j = 0; j < mxf->packages[i]->tracks_count; j++) {

  483.                 if (mxf->packages[i]->tracks[j]) {

  484.                     if (!memcmp(mxf->packages[i]->tracks[j]->sequence_ref, sequence->uid, 16)) {

  485.                         mxf->packages[i]->tracks[j]->sequence = sequence;

  486.                         return 0;

  487.                     }

  488.                 }

  489.             }

  490.         }

  491.     }

  492.     return -1;

  493. }

  494. 

  495. static int mxf_read_metadata_source_package(MXFContext *mxf, KLVPacket *klv)

  496. {

  497.     ByteIOContext *pb = &mxf->fc->pb;

  498.     MXFPackage *package = av_mallocz(sizeof(*package));

  499.     int bytes_read = 0;

  500.     int i;

  501. 

  502.     package->type = SourcePackage;

  503.     while (bytes_read < klv->length) {

  504.         int tag = get_be16(pb);

  505.         int size = get_be16(pb); /* KLV specified by 0x53 */

  506. 

  507.         dprintf("tag 0x%04X, size %d\n", tag, size);

  508.         switch (tag) {

  509.         case 0x3C0A:

  510.             get_buffer(pb, package->uid, 16);

  511.             break;

  512.         case 0x4403:

  513.             package->tracks_count = get_be32(pb);

  514.             if (package->tracks_count >= UINT_MAX / sizeof(UID) ||

  515.                 package->tracks_count >= UINT_MAX / sizeof(*package->tracks))

  516.                 return -1;

  517.             package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));

  518.             package->tracks = av_mallocz(package->tracks_count * sizeof(*package->tracks));

  519.             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  520.             get_buffer(pb, package->tracks_refs, package->tracks_count * sizeof(UID));

  521.             break;

  522.         case 0x4401:

  523.             /* UMID, only get last 16 bytes */

  524.             url_fskip(pb, 16);

  525.             get_buffer(pb, package->package_uid, 16);

  526.             break;

  527.         case 0x4701:

  528.             get_buffer(pb, package->descriptor_ref, 16);

  529.             break;

  530.         default:

  531.             url_fskip(pb, size);

  532.         }

  533.         bytes_read += size + 4;

  534.     }

  535.     for (i = 0; i < mxf->packages_count; i++) {

  536.         if (!memcmp(mxf->packages_refs[i], package->uid, 16)) {

  537.             mxf->packages[i] = package;

  538.             return 0;

  539.         }

  540.     }

  541.     return -1;

  542. }

  543. 

  544. static int mxf_read_metadata_multiple_descriptor(MXFContext *mxf, KLVPacket *klv)

  545. {

  546.     ByteIOContext *pb = &mxf->fc->pb;

  547.     MXFDescriptor *descriptor = av_mallocz(sizeof(*descriptor));

  548.     int bytes_read = 0;

  549.     int i;

  550. 

  551.     while (bytes_read < klv->length) {

  552.         int tag = get_be16(pb);

  553.         int size = get_be16(pb); /* KLV specified by 0x53 */

  554. 

  555.         dprintf("tag 0x%04X, size %d\n", tag, size);

  556.         switch (tag) {

  557.         case 0x3C0A:

  558.             get_buffer(pb, descriptor->uid, 16);

  559.             break;

  560.         case 0x3F01:

  561.             descriptor->sub_descriptors_count = get_be32(pb);

  562.             if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID) ||

  563.                 descriptor->sub_descriptors_count >= UINT_MAX / sizeof(*descriptor->sub_descriptors))

  564.                 return -1;

  565.             descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));

  566.             descriptor->sub_descriptors = av_mallocz(descriptor->sub_descriptors_count * sizeof(*descriptor->sub_descriptors));

  567.             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  568.             get_buffer(pb, descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));

  569.             break;

  570.         default:

  571.             url_fskip(pb, size);

  572.         }

  573.         bytes_read += size + 4;

  574.     }

  575.     for (i = 0; i < mxf->packages_count; i++) {

  576.         if (mxf->packages[i]) {

  577.             if (!memcmp(mxf->packages[i]->descriptor_ref, descriptor->uid, 16)) {

  578.                 mxf->packages[i]->descriptor = descriptor;

  579.                 return 0;

  580.             }

  581.         }

  582.     }

  583.     return -1;

  584. }

  585. 

  586. static void mxf_read_metadata_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)

  587. {

  588.     int code;

  589. 

  590.     do {

  591.         code = get_byte(pb);

  592.         dprintf("pixel layout: code 0x%x\n", code);

  593.         switch (code) {

  594.         case 0x52: /* R */

  595.             descriptor->bits_per_sample += get_byte(pb);

  596.             break;

  597.         case 0x47: /* G */

  598.             descriptor->bits_per_sample += get_byte(pb);

  599.             break;

  600.         case 0x42: /* B */

  601.             descriptor->bits_per_sample += get_byte(pb);

  602.             break;

  603.         default:

  604.             get_byte(pb);

  605.         }

  606.     } while (code != 0); /* SMPTE 377M E.2.46 */

  607. }

  608. 

  609. static int mxf_read_metadata_generic_descriptor(MXFContext *mxf, KLVPacket *klv)

  610. {

  611.     ByteIOContext *pb = &mxf->fc->pb;

  612.     MXFDescriptor *descriptor = av_mallocz(sizeof(*descriptor));

  613.     int bytes_read = 0;

  614.     int i, j;

  615. 

  616.     while (bytes_read < klv->length) {

  617.         int tag = get_be16(pb);

  618.         int size = get_be16(pb); /* KLV specified by 0x53 */

  619. 

  620.         dprintf("tag 0x%04X, size %d\n", tag, size);

  621.         switch (tag) {

  622.         case 0x3C0A:

  623.             get_buffer(pb, descriptor->uid, 16);

  624.             break;

  625.         case 0x3004:

  626.             get_buffer(pb, descriptor->essence_container_ul, 16);

  627.             break;

  628.         case 0x3006:

  629.             descriptor->linked_track_id = get_be32(pb);

  630.             break;

  631.         case 0x3201: /* PictureEssenceCoding */

  632.             get_buffer(pb, descriptor->essence_codec_ul, 16);

  633.             break;

  634.         case 0x3203:

  635.             descriptor->width = get_be32(pb);

  636.             break;

  637.         case 0x3202:

  638.             descriptor->height = get_be32(pb);

  639.             break;

  640.         case 0x320E:

  641.             descriptor->aspect_ratio.num = get_be32(pb);

  642.             descriptor->aspect_ratio.den = get_be32(pb);

  643.             break;

  644.         case 0x3D03:

  645.             descriptor->sample_rate.num = get_be32(pb);

  646.             descriptor->sample_rate.den = get_be32(pb);

  647.             break;

  648.         case 0x3D06: /* SoundEssenceCompression */

  649.             get_buffer(pb, descriptor->essence_codec_ul, 16);

  650.             break;

  651.         case 0x3D07:

  652.             descriptor->channels = get_be32(pb);

  653.             break;

  654.         case 0x3D01:

  655.             descriptor->bits_per_sample = get_be32(pb);

  656.             break;

  657.         case 0x3401:

  658.             mxf_read_metadata_pixel_layout(pb, descriptor);

  659.             break;

  660.         default:

  661.             url_fskip(pb, size);

  662.         }

  663.         bytes_read += size + 4;

  664.     }

  665.     for (i = 0; i < mxf->packages_count; i++) {

  666.         if (mxf->packages[i]) {

  667.             if (!memcmp(mxf->packages[i]->descriptor_ref, descriptor->uid, 16)) {

  668.                 mxf->packages[i]->descriptor = descriptor;

  669.                 return 0;

  670.             } else if (mxf->packages[i]->descriptor) { /* MultipleDescriptor */

  671.                 for (j = 0; j < mxf->packages[i]->descriptor->sub_descriptors_count; j++) {

  672.                     if (!memcmp(mxf->packages[i]->descriptor->sub_descriptors_refs[j], descriptor->uid, 16)) {

  673.                         mxf->packages[i]->descriptor->sub_descriptors[j] = descriptor;

  674.                         return 0;

  675.                     }

  676.                 }

  677.             }

  678.         }

  679.     }

  680.     return -1;

  681. }

  682. 

  683. /* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */

  684. static const UID picture_essence_track_ul = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 };

  685. static const UID sound_essence_track_ul   = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 };

  686. 

  687. static const MXFCodecUL mxf_codec_uls[] = {

  688.     /* PictureEssenceCoding */

  689.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO }, /* 422P@ML I-Frame */

  690.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO }, /* 422P@HL Long GoP */

  691.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO }, /* MP@ML Long GoP */

  692.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO }, /* 422P@ML Long GoP */

  693.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO }, /* MP@HL Long GoP */

  694.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO }, /* D-10 30Mbps PAL */

  695.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO }, /* D-10 50Mbps PAL */

  696.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO }, /* DVCPRO50 PAL */

  697.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO }, /* DVCPRO25 PAL */

  698.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO }, /* DV25 IEC PAL */

  699.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },     CODEC_ID_JPEG2K }, /* JPEG2000 Codestream */

  700.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO }, /* Uncompressed */

  701.     /* SoundEssenceCompression */

  702.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE },

  703.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x02,0x02,0x01,0x7E,0x00,0x00,0x00 },  CODEC_ID_PCM_S16BE }, /* From Omneon MXF file */

  704.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW },

  705.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3 },

  706.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2 }, /* MP2 or MP3 */

  707.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E }, /* Dolby-E */

  708. };

  709. 

  710. static enum CodecID mxf_get_codec_id(const MXFCodecUL *uls, UID *uid)

  711. {

  712.     while (uls->id != CODEC_ID_NONE) {

  713.         if(!memcmp(uls->uid, *uid, 16))

  714.             return uls->id;

  715.         uls++;

  716.     }

  717.     return CODEC_ID_NONE;

  718. }

  719. 

  720. static int mxf_parse_structural_metadata(MXFContext *mxf)

  721. {

  722.     MXFPackage *material_package = NULL;

  723.     MXFPackage *source_package = NULL;

  724.     int i, j, k;

  725. 

  726.     /* TODO: handle multiple material packages (OP3x) */

  727.     for (i = 0; i < mxf->packages_count; i++) {

  728.         if (mxf->packages[i]->type == MaterialPackage) {

  729.             material_package = mxf->packages[i];

  730.             break;

  731.         }

  732.     }

  733.     if (!material_package) {

  734.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  735.         return -1;

  736.     }

  737. 

  738.     for (i = 0; i < material_package->tracks_count; i++) {

  739.         MXFTrack *material_track = material_package->tracks[i];

  740.         MXFTrack *source_track = NULL;

  741.         MXFDescriptor *descriptor = NULL;

  742.         MXFStructuralComponent *component = NULL;

  743.         AVStream *st;

  744. 

  745.         /* TODO: handle multiple source clips */

  746.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  747.             component = material_track->sequence->structural_components[j];

  748.             /* TODO: handle timecode component */

  749.             if (!component || component->type != SourceClip)

  750.                 continue;

  751. 

  752.             for (k = 0; k < mxf->packages_count; k++) {

  753.                 if (!memcmp(mxf->packages[k]->package_uid, component->source_package_uid, 16)) {

  754.                     source_package = mxf->packages[k];

  755.                     break;

  756.                 }

  757.             }

  758.             if (!source_package) {

  759.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);

  760.                 break;

  761.             }

  762.             for (k = 0; k < source_package->tracks_count; k++) {

  763.                 if (source_package->tracks[k]->track_id == component->source_track_id) {

  764.                     source_track = source_package->tracks[k];

  765.                     break;

  766.                 }

  767.             }

  768.             if (!source_track) {

  769.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  770.                 break;

  771.             }

  772.         }

  773.         if (!source_track)

  774.             continue;

  775. 

  776.         st = av_new_stream(mxf->fc, source_track->track_id);

  777.         st->priv_data = source_track;

  778.         st->duration = component->duration;

  779.         if (st->duration == -1)

  780.             st->duration = AV_NOPTS_VALUE;

  781.         st->start_time = component->start_position;

  782.         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);

  783. #ifdef DEBUG

  784.         PRINT_KEY(source_track->sequence->data_definition_ul);

  785. #endif

  786.         if (!memcmp(source_track->sequence->data_definition_ul, picture_essence_track_ul, 16))

  787.             st->codec->codec_type = CODEC_TYPE_VIDEO;

  788.         else if (!memcmp(source_track->sequence->data_definition_ul, sound_essence_track_ul, 16))

  789.             st->codec->codec_type = CODEC_TYPE_AUDIO;

  790.         else

  791.             st->codec->codec_type = CODEC_TYPE_DATA;

  792. 

  793.         if (source_package->descriptor) {

  794.             if (source_package->descriptor->sub_descriptors_count > 0) { /* SourcePackage has MultipleDescriptor */

  795.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  796.                     if (source_package->descriptor->sub_descriptors[j]) {

  797.                         if (source_package->descriptor->sub_descriptors[j]->linked_track_id == source_track->track_id) {

  798.                             descriptor = source_package->descriptor->sub_descriptors[j];

  799.                             break;

  800.                         }

  801.                     }

  802.                 }

  803.             } else {

  804.                 descriptor = source_package->descriptor;

  805.             }

  806.         }

  807.         if (!descriptor) {

  808.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  809.             continue;

  810.         }

  811. #ifdef DEBUG

  812.         PRINT_KEY(descriptor->essence_codec_ul);

  813. #endif

  814.         st->codec->codec_id = mxf_get_codec_id(mxf_codec_uls, &descriptor->essence_codec_ul);

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

  816.             st->codec->width = descriptor->width;

  817.             st->codec->height = descriptor->height;

  818.             st->codec->bits_per_sample = descriptor->bits_per_sample; /* Uncompressed */

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

  820.             st->codec->channels = descriptor->channels;

  821.             st->codec->bits_per_sample = descriptor->bits_per_sample;

  822.             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  823.             /* TODO: implement CODEC_ID_RAWAUDIO */

  824.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  825.                 if (descriptor->bits_per_sample == 24)

  826.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  827.                 else if (descriptor->bits_per_sample == 32)

  828.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  829.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  830.                 if (descriptor->bits_per_sample == 24)

  831.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  832.                 else if (descriptor->bits_per_sample == 32)

  833.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  834.             }

  835.         }

  836.     }

  837.     return 0;

  838. }

  839. 

  840. static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  841. {

  842.     MXFContext *mxf = s->priv_data;

  843.     KLVPacket klv;

  844.     int ret = 0;

  845. 

  846.     mxf->fc = s;

  847.     while (!url_feof(&s->pb)) {

  848.         if (klv_read_packet(&klv, &s->pb) < 0) {

  849.             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");

  850.             return -1;

  851.         }

  852. #ifdef DEBUG

  853.         PRINT_KEY(klv.key);

  854. #endif

  855.         if (IS_KLV_KEY(klv.key, mxf_metadata_track_key))

  856.             ret = mxf_read_metadata_track(mxf, &klv);

  857.         else if (IS_KLV_KEY(klv.key, mxf_metadata_static_track_key))

  858.             ret = mxf_read_metadata_track(mxf, &klv);

  859.         else if (IS_KLV_KEY(klv.key, mxf_metadata_source_package_key))

  860.             ret = mxf_read_metadata_source_package(mxf, &klv);

  861.         else if (IS_KLV_KEY(klv.key, mxf_metadata_sequence_key))

  862.             ret = mxf_read_metadata_sequence(mxf, &klv);

  863.         else if (IS_KLV_KEY(klv.key, mxf_metadata_material_package_key))

  864.             ret = mxf_read_metadata_material_package(mxf, &klv);

  865.         else if (IS_KLV_KEY(klv.key, mxf_metadata_source_clip_key))

  866.             ret = mxf_read_metadata_source_clip(mxf, &klv);

  867.         else if (IS_KLV_KEY(klv.key, mxf_metadata_multiple_descriptor_key))

  868.             ret = mxf_read_metadata_multiple_descriptor(mxf, &klv);

  869.         else if (IS_KLV_KEY(klv.key, mxf_metadata_wave_descriptor_key))

  870.             ret = mxf_read_metadata_generic_descriptor(mxf, &klv);

  871.         else if (IS_KLV_KEY(klv.key, mxf_metadata_mpegvideo_descriptor_key))

  872.             ret = mxf_read_metadata_generic_descriptor(mxf, &klv);

  873.         else if (IS_KLV_KEY(klv.key, mxf_metadata_cdci_descriptor_key))

  874.             ret = mxf_read_metadata_generic_descriptor(mxf, &klv);

  875.         else if (IS_KLV_KEY(klv.key, mxf_metadata_rgba_descriptor_key))

  876.             ret = mxf_read_metadata_generic_descriptor(mxf, &klv);

  877.         else if (IS_KLV_KEY(klv.key, mxf_metadata_generic_sound_descriptor_key))

  878.             ret = mxf_read_metadata_generic_descriptor(mxf, &klv);

  879.         else if (IS_KLV_KEY(klv.key, mxf_metadata_preface_key))

  880.             ret = mxf_read_metadata_preface(mxf, &klv);

  881.         else if (IS_KLV_KEY(klv.key, mxf_metadata_content_storage_key))

  882.             ret = mxf_read_metadata_content_storage(mxf, &klv);

  883.         else if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

  884.             /* FIXME avoid seek */

  885.             url_fseek(&s->pb, klv.offset, SEEK_SET);

  886.             break;

  887.         } else

  888.             url_fskip(&s->pb, klv.length);

  889.         if (ret < 0) {

  890.             av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  891.             return ret;

  892.         }

  893.     }

  894.     return mxf_parse_structural_metadata(mxf);

  895. }

  896. 

  897. static int mxf_read_close(AVFormatContext *s)

  898. {

  899.     MXFContext *mxf = s->priv_data;

  900.     int i, j, k;

  901. 

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

  903.         for (j = 0; j < mxf->packages[i]->tracks_count; j++) {

  904.             for (k = 0; k < mxf->packages[i]->tracks[j]->sequence->structural_components_count; k++)

  905.                 av_freep(&mxf->packages[i]->tracks[j]->sequence->structural_components[k]);

  906.             av_freep(&mxf->packages[i]->tracks[j]->sequence->structural_components_refs);

  907.             av_freep(&mxf->packages[i]->tracks[j]->sequence->structural_components);

  908.             av_freep(&mxf->packages[i]->tracks[j]->sequence);

  909.             av_freep(&mxf->packages[i]->tracks[j]);

  910.         }

  911.         av_freep(&mxf->packages[i]->tracks_refs);

  912.         av_freep(&mxf->packages[i]->tracks);

  913.         if (mxf->packages[i]->descriptor) {

  914.             for (k = 0; k < mxf->packages[i]->descriptor->sub_descriptors_count; k++)

  915.                 av_freep(&mxf->packages[i]->descriptor->sub_descriptors[k]);

  916.             av_freep(&mxf->packages[i]->descriptor->sub_descriptors_refs);

  917.             av_freep(&mxf->packages[i]->descriptor->sub_descriptors);

  918.         }

  919.         av_freep(&mxf->packages[i]->descriptor);

  920.         av_freep(&mxf->packages[i]);

  921.     }

  922.     av_freep(&mxf->packages_refs);

  923.     av_freep(&mxf->packages);

  924.     for (i = 0; i < mxf->essence_container_data_sets_count; i++)

  925.         av_freep(&mxf->essence_container_data_sets[i]);

  926.     av_freep(&mxf->essence_container_data_sets_refs);

  927.     av_freep(&mxf->essence_container_data_sets);

  928.     av_freep(&mxf->essence_containers_uls);

  929.     return 0;

  930. }

  931. 

  932. static int mxf_probe(AVProbeData *p) {

  933.     /* KLV packet describing MXF header partition pack */

  934.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  935.         return 0;

  936. 

  937.     if (IS_KLV_KEY(p->buf, mxf_header_partition_pack_key))

  938.         return AVPROBE_SCORE_MAX;

  939.     else

  940.         return 0;

  941. }

  942. 

  943. 

  944. AVInputFormat mxf_demuxer = {

  945.     "mxf",

  946.     "MXF format",

  947.     sizeof(MXFContext),

  948.     mxf_probe,

  949.     mxf_read_header,

  950.     mxf_read_packet,

  951.     mxf_read_close,

  952.     NULL,

  953. };