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1
/*
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 * MXF demuxer.
3
 * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
/*
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 * References
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 * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
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 * SMPTE 377M MXF File Format Specifications
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 * SMPTE 378M Operational Pattern 1a
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 * SMPTE 379M MXF Generic Container
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 * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
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 * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container
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 * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container
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 *
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 * Principle
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 * Search for Track numbers which will identify essence element KLV packets.
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 * Search for SourcePackage which define tracks which contains Track numbers.
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 * Material Package contains tracks with reference to SourcePackage tracks.
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 * Search for Descriptors (Picture, Sound) which contains codec info and parameters.
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 * Assign Descriptors to correct Tracks.
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 *
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 * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.
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 * Metadata parsing resolves Strong References to objects.
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 *
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 * Simple demuxer, only OP1A supported and some files might not work at all.
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 * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1
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 */
45

    
46
//#define DEBUG
47

    
48
#include "avformat.h"
49

    
50
typedef uint8_t UID[16];
51

    
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enum MXFMetadataSetType {
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    AnyType,
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    MaterialPackage,
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    SourcePackage,
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    SourceClip,
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    TimecodeComponent,
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    Sequence,
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    MultipleDescriptor,
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    Descriptor,
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    Track,
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    EssenceContainerData,
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};
64

    
65
typedef struct MXFStructuralComponent {
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    UID uid;
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    enum MXFMetadataSetType type;
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    UID source_package_uid;
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    UID data_definition_ul;
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    int64_t duration;
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    int64_t start_position;
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    int source_track_id;
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} MXFStructuralComponent;
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typedef struct MXFSequence {
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    UID uid;
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    enum MXFMetadataSetType type;
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    UID data_definition_ul;
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    UID *structural_components_refs;
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    int structural_components_count;
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    int64_t duration;
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} MXFSequence;
83

    
84
typedef struct MXFTrack {
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    UID uid;
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    enum MXFMetadataSetType type;
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    MXFSequence *sequence; /* mandatory, and only one */
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    UID sequence_ref;
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    int track_id;
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    uint8_t track_number[4];
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    AVRational edit_rate;
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} MXFTrack;
93

    
94
typedef struct MXFDescriptor {
95
    UID uid;
96
    enum MXFMetadataSetType type;
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    UID essence_container_ul;
98
    UID essence_codec_ul;
99
    AVRational sample_rate;
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    AVRational aspect_ratio;
101
    int width;
102
    int height;
103
    int channels;
104
    int bits_per_sample;
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    UID *sub_descriptors_refs;
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    int sub_descriptors_count;
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    int linked_track_id;
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    uint8_t *extradata;
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    int extradata_size;
110
} MXFDescriptor;
111

    
112
typedef struct MXFPackage {
113
    UID uid;
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    enum MXFMetadataSetType type;
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    UID package_uid;
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    UID *tracks_refs;
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    int tracks_count;
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    MXFDescriptor *descriptor; /* only one */
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    UID descriptor_ref;
120
} MXFPackage;
121

    
122
typedef struct MXFEssenceContainerData {
123
    UID uid;
124
    enum MXFMetadataSetType type;
125
    UID linked_package_uid;
126
} MXFEssenceContainerData;
127

    
128
typedef struct {
129
    UID uid;
130
    enum MXFMetadataSetType type;
131
} MXFMetadataSet;
132

    
133
typedef struct MXFContext {
134
    UID *packages_refs;
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    int packages_count;
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    MXFMetadataSet **metadata_sets;
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    int metadata_sets_count;
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    const uint8_t *sync_key;
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    AVFormatContext *fc;
140
} MXFContext;
141

    
142
typedef struct KLVPacket {
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    UID key;
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    offset_t offset;
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    uint64_t length;
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} KLVPacket;
147

    
148
enum MXFWrappingScheme {
149
    Frame,
150
    Clip,
151
};
152

    
153
typedef struct MXFCodecUL {
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    UID uid;
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    enum CodecID id;
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    enum MXFWrappingScheme wrapping;
157
} MXFCodecUL;
158

    
159
typedef struct MXFDataDefinitionUL {
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    UID uid;
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    enum CodecType type;
162
} MXFDataDefinitionUL;
163

    
164
typedef struct MXFMetadataReadTableEntry {
165
    const UID key;
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    int (*read)();
167
    int ctx_size;
168
    enum MXFMetadataSetType type;
169
} MXFMetadataReadTableEntry;
170

    
171
/* partial keys to match */
172
static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
173
static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
174
/* complete keys to match */
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static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
176

    
177
#define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
178

    
179
#define PRINT_KEY(s, x) dprintf("%s %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n", s, \
180
                             (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])
181

    
182
static int64_t klv_decode_ber_length(ByteIOContext *pb)
183
{
184
    uint64_t size = get_byte(pb);
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    if (size & 0x80) { /* long form */
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        int bytes_num = size & 0x7f;
187
        /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
188
        if (bytes_num > 8)
189
            return -1;
190
        size = 0;
191
        while (bytes_num--)
192
            size = size << 8 | get_byte(pb);
193
    }
194
    return size;
195
}
196

    
197
static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
198
{
199
    klv->offset = url_ftell(pb);
200
    get_buffer(pb, klv->key, 16);
201
    klv->length = klv_decode_ber_length(pb);
202
    return klv->length == -1 ? -1 : 0;
203
}
204

    
205
static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
206
{
207
    int i;
208

    
209
    for (i = 0; i < s->nb_streams; i++) {
210
        MXFTrack *track = s->streams[i]->priv_data;
211
        /* SMPTE 379M 7.3 */
212
        if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
213
            return i;
214
    }
215
    /* return 0 if only one stream, for OP Atom files with 0 as track number */
216
    return s->nb_streams == 1 ? 0 : -1;
217
}
218

    
219
/* XXX: use AVBitStreamFilter */
220
static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
221
{
222
    uint8_t buffer[61444];
223
    uint8_t *buf_ptr, *end_ptr, *data_ptr;
224

    
225
    if (length > 61444) /* worst case PAL 1920 samples 8 channels */
226
        return -1;
227
    get_buffer(pb, buffer, length);
228
    av_new_packet(pkt, length);
229
    data_ptr = pkt->data;
230
    end_ptr = buffer + length;
231
    buf_ptr = buffer + 4; /* skip SMPTE 331M header */
232
    for (; buf_ptr < end_ptr; buf_ptr += 4) {
233
        if (st->codec->bits_per_sample == 24) {
234
            data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);
235
            data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);
236
            data_ptr[2] = (buf_ptr[0] >> 4) | ((buf_ptr[1] & 0x0f) << 4);
237
            data_ptr += 3;
238
        } else {
239
            data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);
240
            data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);
241
            data_ptr += 2;
242
        }
243
    }
244
    pkt->size = data_ptr - pkt->data;
245
    return 0;
246
}
247

    
248
static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
249
{
250
    MXFContext *mxf = s->priv_data;
251
    KLVPacket klv;
252

    
253
    while (!url_feof(&s->pb)) {
254
        if (klv_read_packet(&klv, &s->pb) < 0) {
255
            av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
256
            return -1;
257
        }
258
#ifdef DEBUG
259
        PRINT_KEY("read packet", klv.key);
260
#endif
261
        if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
262
            mxf->sync_key = mxf_encrypted_triplet_key;
263
            av_log(s, AV_LOG_ERROR, "encrypted triplet not supported\n");
264
            return -1;
265
        }
266
        if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
267
            int index = mxf_get_stream_index(s, &klv);
268
            if (index < 0) {
269
                av_log(s, AV_LOG_ERROR, "error getting stream index\n");
270
                url_fskip(&s->pb, klv.length);
271
                return -1;
272
            }
273
            /* check for 8 channels AES3 element */
274
            if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
275
                if (mxf_get_d10_aes3_packet(&s->pb, s->streams[index], pkt, klv.length) < 0) {
276
                    av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
277
                    return -1;
278
                }
279
            } else
280
                av_get_packet(&s->pb, pkt, klv.length);
281
            pkt->stream_index = index;
282
            return 0;
283
        } else
284
            url_fskip(&s->pb, klv.length);
285
    }
286
    return AVERROR_IO;
287
}
288

    
289
static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
290
{
291
    mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
292
    mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
293
    mxf->metadata_sets_count++;
294
    return 0;
295
}
296

    
297
static int mxf_read_metadata_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)
298
{
299
    switch (tag) {
300
    case 0x1901:
301
        mxf->packages_count = get_be32(pb);
302
        if (mxf->packages_count >= UINT_MAX / sizeof(UID))
303
            return -1;
304
        mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
305
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
306
        get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
307
        break;
308
    }
309
    return 0;
310
}
311

    
312
static int mxf_read_metadata_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)
313
{
314
    switch(tag) {
315
    case 0x0202:
316
        source_clip->duration = get_be64(pb);
317
        break;
318
    case 0x1201:
319
        source_clip->start_position = get_be64(pb);
320
        break;
321
    case 0x1101:
322
        /* UMID, only get last 16 bytes */
323
        url_fskip(pb, 16);
324
        get_buffer(pb, source_clip->source_package_uid, 16);
325
        break;
326
    case 0x1102:
327
        source_clip->source_track_id = get_be32(pb);
328
        break;
329
    }
330
    return 0;
331
}
332

    
333
static int mxf_read_metadata_material_package(MXFPackage *package, ByteIOContext *pb, int tag)
334
{
335
    switch(tag) {
336
    case 0x4403:
337
        package->tracks_count = get_be32(pb);
338
        if (package->tracks_count >= UINT_MAX / sizeof(UID))
339
            return -1;
340
        package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
341
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
342
        get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
343
        break;
344
    }
345
    return 0;
346
}
347

    
348
static int mxf_read_metadata_track(MXFTrack *track, ByteIOContext *pb, int tag)
349
{
350
    switch(tag) {
351
    case 0x4801:
352
        track->track_id = get_be32(pb);
353
        break;
354
    case 0x4804:
355
        get_buffer(pb, track->track_number, 4);
356
        break;
357
    case 0x4B01:
358
        track->edit_rate.den = get_be32(pb);
359
        track->edit_rate.num = get_be32(pb);
360
        break;
361
    case 0x4803:
362
        get_buffer(pb, track->sequence_ref, 16);
363
        break;
364
    }
365
    return 0;
366
}
367

    
368
static int mxf_read_metadata_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)
369
{
370
    switch(tag) {
371
    case 0x0202:
372
        sequence->duration = get_be64(pb);
373
        break;
374
    case 0x0201:
375
        get_buffer(pb, sequence->data_definition_ul, 16);
376
        break;
377
    case 0x1001:
378
        sequence->structural_components_count = get_be32(pb);
379
        if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
380
            return -1;
381
        sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
382
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
383
        get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
384
        break;
385
    }
386
    return 0;
387
}
388

    
389
static int mxf_read_metadata_source_package(MXFPackage *package, ByteIOContext *pb, int tag)
390
{
391
    switch(tag) {
392
    case 0x4403:
393
        package->tracks_count = get_be32(pb);
394
        if (package->tracks_count >= UINT_MAX / sizeof(UID))
395
            return -1;
396
        package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
397
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
398
        get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
399
        break;
400
    case 0x4401:
401
        /* UMID, only get last 16 bytes */
402
        url_fskip(pb, 16);
403
        get_buffer(pb, package->package_uid, 16);
404
        break;
405
    case 0x4701:
406
        get_buffer(pb, package->descriptor_ref, 16);
407
        break;
408
    }
409
    return 0;
410
}
411

    
412
static void mxf_read_metadata_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
413
{
414
    int code;
415

    
416
    do {
417
        code = get_byte(pb);
418
        dprintf("pixel layout: code 0x%x\n", code);
419
        switch (code) {
420
        case 0x52: /* R */
421
            descriptor->bits_per_sample += get_byte(pb);
422
            break;
423
        case 0x47: /* G */
424
            descriptor->bits_per_sample += get_byte(pb);
425
            break;
426
        case 0x42: /* B */
427
            descriptor->bits_per_sample += get_byte(pb);
428
            break;
429
        default:
430
            get_byte(pb);
431
        }
432
    } while (code != 0); /* SMPTE 377M E.2.46 */
433
}
434

    
435
static int mxf_read_metadata_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size)
436
{
437
    switch(tag) {
438
    case 0x3F01:
439
        descriptor->sub_descriptors_count = get_be32(pb);
440
        if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
441
            return -1;
442
        descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
443
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
444
        get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
445
        break;
446
    case 0x3004:
447
        get_buffer(pb, descriptor->essence_container_ul, 16);
448
        break;
449
    case 0x3006:
450
        descriptor->linked_track_id = get_be32(pb);
451
        break;
452
    case 0x3201: /* PictureEssenceCoding */
453
        get_buffer(pb, descriptor->essence_codec_ul, 16);
454
        break;
455
    case 0x3203:
456
        descriptor->width = get_be32(pb);
457
        break;
458
    case 0x3202:
459
        descriptor->height = get_be32(pb);
460
        break;
461
    case 0x320E:
462
        descriptor->aspect_ratio.num = get_be32(pb);
463
        descriptor->aspect_ratio.den = get_be32(pb);
464
        break;
465
    case 0x3D03:
466
        descriptor->sample_rate.num = get_be32(pb);
467
        descriptor->sample_rate.den = get_be32(pb);
468
        break;
469
    case 0x3D06: /* SoundEssenceCompression */
470
        get_buffer(pb, descriptor->essence_codec_ul, 16);
471
        break;
472
    case 0x3D07:
473
        descriptor->channels = get_be32(pb);
474
        break;
475
    case 0x3D01:
476
        descriptor->bits_per_sample = get_be32(pb);
477
        break;
478
    case 0x3401:
479
        mxf_read_metadata_pixel_layout(pb, descriptor);
480
        break;
481
    case 0x8201: /* Private tag used by SONY C0023S01.mxf */
482
        descriptor->extradata = av_malloc(size);
483
        descriptor->extradata_size = size;
484
        get_buffer(pb, descriptor->extradata, size);
485
        break;
486
    }
487
    return 0;
488
}
489

    
490
/* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */
491
static const MXFDataDefinitionUL mxf_data_definition_uls[] = {
492
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },
493
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },
494
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },
495
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },
496
};
497

    
498
static const MXFCodecUL mxf_codec_uls[] = {
499
    /* PictureEssenceCoding */
500
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */
501
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL I-Frame */
502
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */
503
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */
504
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */
505
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */
506
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */
507
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */
508
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */
509
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */
510
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */
511
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */
512
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */
513
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */
514
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */
515
    /* SoundEssenceCompression */
516
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */
517
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },
518
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x02,0x02,0x01,0x7E,0x00,0x00,0x00 },  CODEC_ID_PCM_S16BE, Frame }, /* From Omneon MXF file */
519
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },
520
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x04,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame }, /* XDCAM Proxy C0023S01.mxf */
521
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },
522
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */
523
  //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */
524
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
525
};
526

    
527
static const MXFCodecUL mxf_picture_essence_container_uls[] = {
528
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */
529
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xe0,0x02 }, CODEC_ID_MPEG2VIDEO,  Clip }, /* MPEG-ES Clip wrapped, 0xe0 MPV stream id */
530
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x04,0x61,0x07 }, CODEC_ID_MPEG2VIDEO,  Clip }, /* MPEG-ES Custom wrapped, 0x61 ??? stream id */
531
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
532
};
533

    
534
static const MXFCodecUL mxf_sound_essence_container_uls[] = {
535
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */
536
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */
537
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 },        CODEC_ID_MP2, Frame }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */
538
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xc0,0x01 },        CODEC_ID_MP2, Frame }, /* MPEG-ES Frame wrapped, 0xc0 MPA stream id */
539
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xc0,0x02 },        CODEC_ID_MP2,  Clip }, /* MPEG-ES Clip wrapped, 0xc0 MPA stream id */
540
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x05,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 30Mbps PAL Extended Template */
541
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 50Mbps PAL Extended Template */
542
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
543
};
544

    
545
static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
546
{
547
    while (uls->id != CODEC_ID_NONE) {
548
        if(!memcmp(uls->uid, *uid, 16))
549
            break;
550
        uls++;
551
    }
552
    return uls;
553
}
554

    
555
static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
556
{
557
    while (uls->type != CODEC_TYPE_DATA) {
558
        if(!memcmp(uls->uid, *uid, 16))
559
            break;
560
        uls++;
561
    }
562
    return uls->type;
563
}
564

    
565
static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
566
{
567
    int i;
568

    
569
    if (!strong_ref)
570
        return NULL;
571
    for (i = 0; i < mxf->metadata_sets_count; i++) {
572
        if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
573
            (type == AnyType || mxf->metadata_sets[i]->type == type)) {
574
            return mxf->metadata_sets[i];
575
        }
576
    }
577
    return NULL;
578
}
579

    
580
static int mxf_parse_structural_metadata(MXFContext *mxf)
581
{
582
    MXFPackage *material_package = NULL;
583
    MXFPackage *temp_package = NULL;
584
    int i, j, k;
585

    
586
    dprintf("metadata sets count %d\n", mxf->metadata_sets_count);
587
    /* TODO: handle multiple material packages (OP3x) */
588
    for (i = 0; i < mxf->packages_count; i++) {
589
        material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
590
        if (material_package) break;
591
    }
592
    if (!material_package) {
593
        av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
594
        return -1;
595
    }
596

    
597
    for (i = 0; i < material_package->tracks_count; i++) {
598
        MXFPackage *source_package = NULL;
599
        MXFTrack *material_track = NULL;
600
        MXFTrack *source_track = NULL;
601
        MXFTrack *temp_track = NULL;
602
        MXFDescriptor *descriptor = NULL;
603
        MXFStructuralComponent *component = NULL;
604
        const MXFCodecUL *codec_ul = NULL;
605
        const MXFCodecUL *container_ul = NULL;
606
        AVStream *st;
607

    
608
        if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
609
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
610
            continue;
611
        }
612

    
613
        if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
614
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
615
            return -1;
616
        }
617

    
618
        /* TODO: handle multiple source clips */
619
        for (j = 0; j < material_track->sequence->structural_components_count; j++) {
620
            /* TODO: handle timecode component */
621
            component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
622
            if (!component)
623
                continue;
624

    
625
            for (k = 0; k < mxf->packages_count; k++) {
626
                temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
627
                if (!temp_package)
628
                    continue;
629
                if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
630
                    source_package = temp_package;
631
                    break;
632
                }
633
            }
634
            if (!source_package) {
635
                av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
636
                break;
637
            }
638
            for (k = 0; k < source_package->tracks_count; k++) {
639
                if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
640
                    av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
641
                    return -1;
642
                }
643
                if (temp_track->track_id == component->source_track_id) {
644
                    source_track = temp_track;
645
                    break;
646
                }
647
            }
648
            if (!source_track) {
649
                av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
650
                break;
651
            }
652
        }
653
        if (!source_track)
654
            continue;
655

    
656
        st = av_new_stream(mxf->fc, source_track->track_id);
657
        st->priv_data = source_track;
658
        st->duration = component->duration;
659
        if (st->duration == -1)
660
            st->duration = AV_NOPTS_VALUE;
661
        st->start_time = component->start_position;
662
        av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
663

    
664
        if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
665
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
666
            return -1;
667
        }
668

    
669
#ifdef DEBUG
670
        PRINT_KEY("data definition   ul", source_track->sequence->data_definition_ul);
671
#endif
672
        st->codec->codec_type = mxf_get_codec_type(mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
673

    
674
        source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
675
        if (source_package->descriptor) {
676
            if (source_package->descriptor->type == MultipleDescriptor) {
677
                for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
678
                    MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
679

    
680
                    if (!sub_descriptor) {
681
                        av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
682
                        continue;
683
                    }
684
                    if (sub_descriptor->linked_track_id == source_track->track_id) {
685
                        descriptor = sub_descriptor;
686
                        break;
687
                    }
688
                }
689
            } else if (source_package->descriptor->type == Descriptor)
690
                descriptor = source_package->descriptor;
691
        }
692
        if (!descriptor) {
693
            av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
694
            continue;
695
        }
696
#ifdef DEBUG
697
        PRINT_KEY("essence codec     ul", descriptor->essence_codec_ul);
698
        PRINT_KEY("essence container ul", descriptor->essence_container_ul);
699
#endif
700
        /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
701
        codec_ul = mxf_get_codec_ul(mxf_codec_uls, &descriptor->essence_codec_ul);
702
        st->codec->codec_id = codec_ul->id;
703
        if (descriptor->extradata) {
704
            st->codec->extradata = descriptor->extradata;
705
            st->codec->extradata_size = descriptor->extradata_size;
706
        }
707
        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
708
            container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, &descriptor->essence_container_ul);
709
            if (st->codec->codec_id == CODEC_ID_NONE)
710
                st->codec->codec_id = container_ul->id;
711
            st->codec->width = descriptor->width;
712
            st->codec->height = descriptor->height;
713
            st->codec->bits_per_sample = descriptor->bits_per_sample; /* Uncompressed */
714
            st->need_parsing = 2; /* only parse headers */
715
        } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
716
            container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, &descriptor->essence_container_ul);
717
            if (st->codec->codec_id == CODEC_ID_NONE)
718
                st->codec->codec_id = container_ul->id;
719
            st->codec->channels = descriptor->channels;
720
            st->codec->bits_per_sample = descriptor->bits_per_sample;
721
            st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
722
            /* TODO: implement CODEC_ID_RAWAUDIO */
723
            if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
724
                if (descriptor->bits_per_sample == 24)
725
                    st->codec->codec_id = CODEC_ID_PCM_S24LE;
726
                else if (descriptor->bits_per_sample == 32)
727
                    st->codec->codec_id = CODEC_ID_PCM_S32LE;
728
            } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
729
                if (descriptor->bits_per_sample == 24)
730
                    st->codec->codec_id = CODEC_ID_PCM_S24BE;
731
                else if (descriptor->bits_per_sample == 32)
732
                    st->codec->codec_id = CODEC_ID_PCM_S32BE;
733
                if (descriptor->essence_container_ul[13] == 0x01) /* D-10 Mapping */
734
                    st->codec->channels = 8; /* force channels to 8 */
735
            } else if (st->codec->codec_id == CODEC_ID_MP2) {
736
                st->need_parsing = 1;
737
            }
738
        }
739
        if (container_ul && container_ul->wrapping == Clip) {
740
            dprintf("stream %d: clip wrapped essence\n", st->index);
741
            st->need_parsing = 1;
742
        }
743
    }
744
    return 0;
745
}
746

    
747
static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
748
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage, 0, AnyType },
749
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package, sizeof(MXFPackage), SourcePackage },
750
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package, sizeof(MXFPackage), MaterialPackage },
751
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence, sizeof(MXFSequence), Sequence },
752
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip, sizeof(MXFStructuralComponent), SourceClip },
753
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
754
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */
755
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
756
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
757
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */
758
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
759
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
760
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track, sizeof(MXFTrack), Track }, /* Static Track */
761
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track, sizeof(MXFTrack), Track }, /* Generic Track */
762
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
763
};
764

    
765
static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
766
{
767
    int i, b;
768
    for (i = 0; i < size && !url_feof(pb); i++) {
769
        b = get_byte(pb);
770
        if (b == key[0])
771
            i = 0;
772
        else if (b != key[i])
773
            i = -1;
774
    }
775
    return i == size;
776
}
777

    
778
static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)
779
{
780
    ByteIOContext *pb = &mxf->fc->pb;
781
    MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
782
    uint64_t klv_end= url_ftell(pb) + klv->length;
783

    
784
    while (url_ftell(pb) + 4 < klv_end) {
785
        int tag = get_be16(pb);
786
        int size = get_be16(pb); /* KLV specified by 0x53 */
787
        uint64_t next= url_ftell(pb) + size;
788

    
789
        if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
790
            av_log(mxf->fc, AV_LOG_ERROR, "local tag 0x%04X with 0 size\n", tag);
791
            continue;
792
        }
793
        if(ctx_size && tag == 0x3C0A)
794
            get_buffer(pb, ctx->uid, 16);
795
        else
796
            read_child(ctx, pb, tag, size);
797

    
798
        url_fseek(pb, next, SEEK_SET);
799
    }
800
    if (ctx_size) ctx->type = type;
801
    return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
802
}
803

    
804
static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
805
{
806
    MXFContext *mxf = s->priv_data;
807
    KLVPacket klv;
808

    
809
    mxf->sync_key = mxf_essence_element_key;
810
    if (!mxf_read_sync(&s->pb, mxf_header_partition_pack_key, 14)) {
811
        av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
812
        return -1;
813
    }
814
    url_fseek(&s->pb, -14, SEEK_CUR);
815
    mxf->fc = s;
816
    while (!url_feof(&s->pb)) {
817
        const MXFMetadataReadTableEntry *metadata;
818

    
819
        if (klv_read_packet(&klv, &s->pb) < 0) {
820
            av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
821
            return -1;
822
        }
823
#ifdef DEBUG
824
        PRINT_KEY("read header", klv.key);
825
#endif
826
        if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
827
            /* FIXME avoid seek */
828
            url_fseek(&s->pb, klv.offset, SEEK_SET);
829
            break;
830
        }
831

    
832
        for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
833
            if (IS_KLV_KEY(klv.key, metadata->key)) {
834
                if (mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) {
835
                    av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
836
                    return -1;
837
                }
838
                break;
839
            }
840
        }
841
        if (!metadata->read)
842
            url_fskip(&s->pb, klv.length);
843
    }
844
    return mxf_parse_structural_metadata(mxf);
845
}
846

    
847
static int mxf_read_close(AVFormatContext *s)
848
{
849
    MXFContext *mxf = s->priv_data;
850
    int i;
851

    
852
    av_freep(&mxf->packages_refs);
853
    for (i = 0; i < mxf->metadata_sets_count; i++) {
854
        switch (mxf->metadata_sets[i]->type) {
855
        case MultipleDescriptor:
856
            av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
857
            break;
858
        case Sequence:
859
            av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
860
            break;
861
        case SourcePackage:
862
        case MaterialPackage:
863
            av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
864
            break;
865
        default:
866
            break;
867
        }
868
        av_freep(&mxf->metadata_sets[i]);
869
    }
870
    av_freep(&mxf->metadata_sets);
871
    return 0;
872
}
873

    
874
static int mxf_probe(AVProbeData *p) {
875
    uint8_t *bufp = p->buf;
876
    uint8_t *end = p->buf + p->buf_size;
877

    
878
    if (p->buf_size < sizeof(mxf_header_partition_pack_key))
879
        return 0;
880

    
881
    /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
882
    end -= sizeof(mxf_header_partition_pack_key);
883
    for (; bufp < end; bufp++) {
884
        if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
885
            return AVPROBE_SCORE_MAX;
886
    }
887
    return 0;
888
}
889

    
890
/* rudimentary binary seek */
891
/* XXX: use MXF Index */
892
static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
893
{
894
    MXFContext *mxf = s->priv_data;
895
    AVStream *st = s->streams[stream_index];
896
    int64_t seconds;
897

    
898
    if (!s->bit_rate)
899
        return -1;
900
    if (sample_time < 0)
901
        sample_time = 0;
902
    seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
903
    url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
904
    if (!mxf_read_sync(&s->pb, mxf->sync_key, 12))
905
        return -1;
906

    
907
    /* found KLV key */
908
    url_fseek(&s->pb, -12, SEEK_CUR);
909
    av_update_cur_dts(s, st, sample_time);
910
    return 0;
911
}
912

    
913
AVInputFormat mxf_demuxer = {
914
    "mxf",
915
    "MXF format",
916
    sizeof(MXFContext),
917
    mxf_probe,
918
    mxf_read_header,
919
    mxf_read_packet,
920
    mxf_read_close,
921
    mxf_read_seek,
922
};