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FFmpeg/libavformat/mxfdec.c

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/*
* MXF demuxer.
* Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* References
* SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
* SMPTE 377M MXF File Format Specifications
* SMPTE 378M Operational Pattern 1a
* SMPTE 379M MXF Generic Container
* SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
* SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container
* SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container
*
* Principle
* Search for Track numbers which will identify essence element KLV packets.
* Search for SourcePackage which define tracks which contains Track numbers.
* Material Package contains tracks with reference to SourcePackage tracks.
* Search for Descriptors (Picture, Sound) which contains codec info and parameters.
* Assign Descriptors to correct Tracks.
*
* Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.
* Metadata parsing resolves Strong References to objects.
*
* Simple demuxer, only OP1A supported and some files might not work at all.
* Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1
*/
//#define DEBUG
#include "libavutil/aes.h"
#include "mxf.h"
typedef struct {
UID uid;
enum MXFMetadataSetType type;
UID source_container_ul;
} MXFCryptoContext;
typedef struct {
UID uid;
enum MXFMetadataSetType type;
UID source_package_uid;
UID data_definition_ul;
int64_t duration;
int64_t start_position;
int source_track_id;
} MXFStructuralComponent;
typedef struct {
UID uid;
enum MXFMetadataSetType type;
UID data_definition_ul;
UID *structural_components_refs;
int structural_components_count;
int64_t duration;
} MXFSequence;
typedef struct {
UID uid;
enum MXFMetadataSetType type;
MXFSequence *sequence; /* mandatory, and only one */
UID sequence_ref;
int track_id;
uint8_t track_number[4];
AVRational edit_rate;
} MXFTrack;
typedef struct {
UID uid;
enum MXFMetadataSetType type;
UID essence_container_ul;
UID essence_codec_ul;
AVRational sample_rate;
AVRational aspect_ratio;
int width;
int height;
int channels;
int bits_per_sample;
UID *sub_descriptors_refs;
int sub_descriptors_count;
int linked_track_id;
uint8_t *extradata;
int extradata_size;
} MXFDescriptor;
typedef struct {
UID uid;
enum MXFMetadataSetType type;
UID package_uid;
UID *tracks_refs;
int tracks_count;
MXFDescriptor *descriptor; /* only one */
UID descriptor_ref;
} MXFPackage;
typedef struct {
UID uid;
enum MXFMetadataSetType type;
} MXFMetadataSet;
typedef struct {
UID *packages_refs;
int packages_count;
MXFMetadataSet **metadata_sets;
int metadata_sets_count;
AVFormatContext *fc;
struct AVAES *aesc;
uint8_t *local_tags;
int local_tags_count;
} MXFContext;
enum MXFWrappingScheme {
Frame,
Clip,
};
typedef struct {
const UID key;
int (*read)();
int ctx_size;
enum MXFMetadataSetType type;
} MXFMetadataReadTableEntry;
/* partial keys to match */
static const uint8_t mxf_header_partition_pack_key[] = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
static const uint8_t mxf_essence_element_key[] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
static const uint8_t mxf_klv_key[] = { 0x06,0x0e,0x2b,0x34 };
/* complete keys to match */
static const uint8_t mxf_crypto_source_container_ul[] = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };
static const uint8_t mxf_encrypted_triplet_key[] = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
static const uint8_t mxf_encrypted_essence_container[] = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
static const uint8_t mxf_sony_mpeg4_extradata[] = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
#define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
static int64_t klv_decode_ber_length(ByteIOContext *pb)
{
uint64_t size = get_byte(pb);
if (size & 0x80) { /* long form */
int bytes_num = size & 0x7f;
/* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
if (bytes_num > 8)
return -1;
size = 0;
while (bytes_num--)
size = size << 8 | get_byte(pb);
}
return size;
}
static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
{
int i, b;
for (i = 0; i < size && !url_feof(pb); i++) {
b = get_byte(pb);
if (b == key[0])
i = 0;
else if (b != key[i])
i = -1;
}
return i == size;
}
static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
{
if (!mxf_read_sync(pb, mxf_klv_key, 4))
return -1;
klv->offset = url_ftell(pb) - 4;
memcpy(klv->key, mxf_klv_key, 4);
get_buffer(pb, klv->key + 4, 12);
klv->length = klv_decode_ber_length(pb);
return klv->length == -1 ? -1 : 0;
}
static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
{
int i;
for (i = 0; i < s->nb_streams; i++) {
MXFTrack *track = s->streams[i]->priv_data;
/* SMPTE 379M 7.3 */
if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
return i;
}
/* return 0 if only one stream, for OP Atom files with 0 as track number */
return s->nb_streams == 1 ? 0 : -1;
}
/* XXX: use AVBitStreamFilter */
static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
{
uint8_t buffer[61444];
const uint8_t *buf_ptr, *end_ptr;
uint8_t *data_ptr;
int i;
if (length > 61444) /* worst case PAL 1920 samples 8 channels */
return -1;
get_buffer(pb, buffer, length);
av_new_packet(pkt, length);
data_ptr = pkt->data;
end_ptr = buffer + length;
buf_ptr = buffer + 4; /* skip SMPTE 331M header */
for (; buf_ptr < end_ptr; ) {
for (i = 0; i < st->codec->channels; i++) {
uint32_t sample = bytestream_get_le32(&buf_ptr);
if (st->codec->bits_per_sample == 24)
bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);
else
bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);
}
buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M
}
pkt->size = data_ptr - pkt->data;
return 0;
}
static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)
{
static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};
MXFContext *mxf = s->priv_data;
ByteIOContext *pb = s->pb;
offset_t end = url_ftell(pb) + klv->length;
uint64_t size;
uint64_t orig_size;
uint64_t plaintext_size;
uint8_t ivec[16];
uint8_t tmpbuf[16];
int index;
if (!mxf->aesc && s->key && s->keylen == 16) {
mxf->aesc = av_malloc(av_aes_size);
if (!mxf->aesc)
return -1;
av_aes_init(mxf->aesc, s->key, 128, 1);
}
// crypto context
url_fskip(pb, klv_decode_ber_length(pb));
// plaintext offset
klv_decode_ber_length(pb);
plaintext_size = get_be64(pb);
// source klv key
klv_decode_ber_length(pb);
get_buffer(pb, klv->key, 16);
if (!IS_KLV_KEY(klv, mxf_essence_element_key))
return -1;
index = mxf_get_stream_index(s, klv);
if (index < 0)
return -1;
// source size
klv_decode_ber_length(pb);
orig_size = get_be64(pb);
if (orig_size < plaintext_size)
return -1;
// enc. code
size = klv_decode_ber_length(pb);
if (size < 32 || size - 32 < orig_size)
return -1;
get_buffer(pb, ivec, 16);
get_buffer(pb, tmpbuf, 16);
if (mxf->aesc)
av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);
if (memcmp(tmpbuf, checkv, 16))
av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");
size -= 32;
av_get_packet(pb, pkt, size);
size -= plaintext_size;
if (mxf->aesc)
av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],
&pkt->data[plaintext_size], size >> 4, ivec, 1);
pkt->size = orig_size;
pkt->stream_index = index;
url_fskip(pb, end - url_ftell(pb));
return 0;
}
static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
KLVPacket klv;
while (!url_feof(s->pb)) {
if (klv_read_packet(&klv, s->pb) < 0)
return -1;
PRINT_KEY(s, "read packet", klv.key);
if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
int res = mxf_decrypt_triplet(s, pkt, &klv);
if (res < 0) {
av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
return -1;
}
return 0;
}
if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
int index = mxf_get_stream_index(s, &klv);
if (index < 0) {
av_log(s, AV_LOG_ERROR, "error getting stream index %x\n", AV_RB32(klv.key+12));
goto skip;
}
if (s->streams[index]->discard == AVDISCARD_ALL)
goto skip;
/* check for 8 channels AES3 element */
if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {
av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
return -1;
}
} else
av_get_packet(s->pb, pkt, klv.length);
pkt->stream_index = index;
pkt->pos = klv.offset;
return 0;
} else
skip:
url_fskip(s->pb, klv.length);
}
return AVERROR(EIO);
}
static int mxf_read_primer_pack(MXFContext *mxf)
{
ByteIOContext *pb = mxf->fc->pb;
int item_num = get_be32(pb);
int item_len = get_be32(pb);
if (item_len != 18) {
av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n");
return -1;
}
if (item_num > UINT_MAX / item_len)
return -1;
mxf->local_tags_count = item_num;
mxf->local_tags = av_malloc(item_num*item_len);
if (!mxf->local_tags)
return -1;
get_buffer(pb, mxf->local_tags, item_num*item_len);
return 0;
}
static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
{
mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
if (!mxf->metadata_sets)
return -1;
mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
mxf->metadata_sets_count++;
return 0;
}
static int mxf_read_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid)
{
if (size != 16)
return -1;
if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))
get_buffer(pb, cryptocontext->source_container_ul, 16);
return 0;
}
static int mxf_read_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)
{
switch (tag) {
case 0x1901:
mxf->packages_count = get_be32(pb);
if (mxf->packages_count >= UINT_MAX / sizeof(UID))
return -1;
mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
if (!mxf->packages_refs)
return -1;
url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
break;
}
return 0;
}
static int mxf_read_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)
{
switch(tag) {
case 0x0202:
source_clip->duration = get_be64(pb);
break;
case 0x1201:
source_clip->start_position = get_be64(pb);
break;
case 0x1101:
/* UMID, only get last 16 bytes */
url_fskip(pb, 16);
get_buffer(pb, source_clip->source_package_uid, 16);
break;
case 0x1102:
source_clip->source_track_id = get_be32(pb);
break;
}
return 0;
}
static int mxf_read_material_package(MXFPackage *package, ByteIOContext *pb, int tag)
{
switch(tag) {
case 0x4403:
package->tracks_count = get_be32(pb);
if (package->tracks_count >= UINT_MAX / sizeof(UID))
return -1;
package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
if (!package->tracks_refs)
return -1;
url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
break;
}
return 0;
}
static int mxf_read_track(MXFTrack *track, ByteIOContext *pb, int tag)
{
switch(tag) {
case 0x4801:
track->track_id = get_be32(pb);
break;
case 0x4804:
get_buffer(pb, track->track_number, 4);
break;
case 0x4B01:
track->edit_rate.den = get_be32(pb);
track->edit_rate.num = get_be32(pb);
break;
case 0x4803:
get_buffer(pb, track->sequence_ref, 16);
break;
}
return 0;
}
static int mxf_read_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)
{
switch(tag) {
case 0x0202:
sequence->duration = get_be64(pb);
break;
case 0x0201:
get_buffer(pb, sequence->data_definition_ul, 16);
break;
case 0x1001:
sequence->structural_components_count = get_be32(pb);
if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
return -1;
sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
if (!sequence->structural_components_refs)
return -1;
url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
break;
}
return 0;
}
static int mxf_read_source_package(MXFPackage *package, ByteIOContext *pb, int tag)
{
switch(tag) {
case 0x4403:
package->tracks_count = get_be32(pb);
if (package->tracks_count >= UINT_MAX / sizeof(UID))
return -1;
package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
if (!package->tracks_refs)
return -1;
url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
break;
case 0x4401:
/* UMID, only get last 16 bytes */
url_fskip(pb, 16);
get_buffer(pb, package->package_uid, 16);
break;
case 0x4701:
get_buffer(pb, package->descriptor_ref, 16);
break;
}
return 0;
}
static void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
{
int code;
do {
code = get_byte(pb);
dprintf(NULL, "pixel layout: code 0x%x\n", code);
switch (code) {
case 0x52: /* R */
descriptor->bits_per_sample += get_byte(pb);
break;
case 0x47: /* G */
descriptor->bits_per_sample += get_byte(pb);
break;
case 0x42: /* B */
descriptor->bits_per_sample += get_byte(pb);
break;
default:
get_byte(pb);
}
} while (code != 0); /* SMPTE 377M E.2.46 */
}
static int mxf_read_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size, UID uid)
{
switch(tag) {
case 0x3F01:
descriptor->sub_descriptors_count = get_be32(pb);
if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
return -1;
descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
if (!descriptor->sub_descriptors_refs)
return -1;
url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
break;
case 0x3004:
get_buffer(pb, descriptor->essence_container_ul, 16);
break;
case 0x3006:
descriptor->linked_track_id = get_be32(pb);
break;
case 0x3201: /* PictureEssenceCoding */
get_buffer(pb, descriptor->essence_codec_ul, 16);
break;
case 0x3203:
descriptor->width = get_be32(pb);
break;
case 0x3202:
descriptor->height = get_be32(pb);
break;
case 0x320E:
descriptor->aspect_ratio.num = get_be32(pb);
descriptor->aspect_ratio.den = get_be32(pb);
break;
case 0x3D03:
descriptor->sample_rate.num = get_be32(pb);
descriptor->sample_rate.den = get_be32(pb);
break;
case 0x3D06: /* SoundEssenceCompression */
get_buffer(pb, descriptor->essence_codec_ul, 16);
break;
case 0x3D07:
descriptor->channels = get_be32(pb);
break;
case 0x3D01:
descriptor->bits_per_sample = get_be32(pb);
break;
case 0x3401:
mxf_read_pixel_layout(pb, descriptor);
break;
default:
/* Private uid used by SONY C0023S01.mxf */
if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {
descriptor->extradata = av_malloc(size);
if (!descriptor->extradata)
return -1;
descriptor->extradata_size = size;
get_buffer(pb, descriptor->extradata, size);
}
break;
}
return 0;
}
/*
* Match an uid independently of the version byte and up to len common bytes
* Returns: boolean
*/
static int mxf_match_uid(const UID key, const UID uid, int len)
{
int i;
for (i = 0; i < len; i++) {
if (i != 7 && key[i] != uid[i])
return 0;
}
return 1;
}
static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
{
while (uls->id != CODEC_ID_NONE) {
if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
break;
uls++;
}
return uls;
}
static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
{
while (uls->type != CODEC_TYPE_DATA) {
if(mxf_match_uid(uls->uid, *uid, 16))
break;
uls++;
}
return uls->type;
}
static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
{
int i;
if (!strong_ref)
return NULL;
for (i = 0; i < mxf->metadata_sets_count; i++) {
if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
(type == AnyType || mxf->metadata_sets[i]->type == type)) {
return mxf->metadata_sets[i];
}
}
return NULL;
}
static int mxf_parse_structural_metadata(MXFContext *mxf)
{
MXFPackage *material_package = NULL;
MXFPackage *temp_package = NULL;
int i, j, k;
dprintf(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);
/* TODO: handle multiple material packages (OP3x) */
for (i = 0; i < mxf->packages_count; i++) {
material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
if (material_package) break;
}
if (!material_package) {
av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
return -1;
}
for (i = 0; i < material_package->tracks_count; i++) {
MXFPackage *source_package = NULL;
MXFTrack *material_track = NULL;
MXFTrack *source_track = NULL;
MXFTrack *temp_track = NULL;
MXFDescriptor *descriptor = NULL;
MXFStructuralComponent *component = NULL;
UID *essence_container_ul = NULL;
const MXFCodecUL *codec_ul = NULL;
const MXFCodecUL *container_ul = NULL;
AVStream *st;
if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
continue;
}
if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
return -1;
}
/* TODO: handle multiple source clips */
for (j = 0; j < material_track->sequence->structural_components_count; j++) {
/* TODO: handle timecode component */
component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
if (!component)
continue;
for (k = 0; k < mxf->packages_count; k++) {
temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
if (!temp_package)
continue;
if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
source_package = temp_package;
break;
}
}
if (!source_package) {
av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
break;
}
for (k = 0; k < source_package->tracks_count; k++) {
if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
return -1;
}
if (temp_track->track_id == component->source_track_id) {
source_track = temp_track;
break;
}
}
if (!source_track) {
av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
break;
}
}
if (!source_track)
continue;
st = av_new_stream(mxf->fc, source_track->track_id);
if (!st) {
av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
return -1;
}
st->priv_data = source_track;
st->duration = component->duration;
if (st->duration == -1)
st->duration = AV_NOPTS_VALUE;
st->start_time = component->start_position;
av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
return -1;
}
PRINT_KEY(mxf->fc, "data definition ul", source_track->sequence->data_definition_ul);
st->codec->codec_type = mxf_get_codec_type(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
if (source_package->descriptor) {
if (source_package->descriptor->type == MultipleDescriptor) {
for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
if (!sub_descriptor) {
av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
continue;
}
if (sub_descriptor->linked_track_id == source_track->track_id) {
descriptor = sub_descriptor;
break;
}
}
} else if (source_package->descriptor->type == Descriptor)
descriptor = source_package->descriptor;
}
if (!descriptor) {
av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
continue;
}
PRINT_KEY(mxf->fc, "essence codec ul", descriptor->essence_codec_ul);
PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
essence_container_ul = &descriptor->essence_container_ul;
/* HACK: replacing the original key with mxf_encrypted_essence_container
* is not allowed according to s429-6, try to find correct information anyway */
if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {
av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");
for (k = 0; k < mxf->metadata_sets_count; k++) {
MXFMetadataSet *metadata = mxf->metadata_sets[k];
if (metadata->type == CryptoContext) {
essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;
break;
}
}
}
/* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);
st->codec->codec_id = codec_ul->id;
if (descriptor->extradata) {
st->codec->extradata = descriptor->extradata;
st->codec->extradata_size = descriptor->extradata_size;
}
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
container_ul = mxf_get_codec_ul(ff_mxf_essence_container_uls, essence_container_ul);
if (st->codec->codec_id == CODEC_ID_NONE)
st->codec->codec_id = container_ul->id;
st->codec->width = descriptor->width;
st->codec->height = descriptor->height;
st->codec->bits_per_sample = descriptor->bits_per_sample; /* Uncompressed */
st->need_parsing = AVSTREAM_PARSE_HEADERS;
} else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
container_ul = mxf_get_codec_ul(ff_mxf_essence_container_uls, essence_container_ul);
if (st->codec->codec_id == CODEC_ID_NONE)
st->codec->codec_id = container_ul->id;
st->codec->channels = descriptor->channels;
st->codec->bits_per_sample = descriptor->bits_per_sample;
st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
/* TODO: implement CODEC_ID_RAWAUDIO */
if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
if (descriptor->bits_per_sample == 24)
st->codec->codec_id = CODEC_ID_PCM_S24LE;
else if (descriptor->bits_per_sample == 32)
st->codec->codec_id = CODEC_ID_PCM_S32LE;
} else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
if (descriptor->bits_per_sample == 24)
st->codec->codec_id = CODEC_ID_PCM_S24BE;
else if (descriptor->bits_per_sample == 32)
st->codec->codec_id = CODEC_ID_PCM_S32BE;
} else if (st->codec->codec_id == CODEC_ID_MP2) {
st->need_parsing = AVSTREAM_PARSE_FULL;
}
}
if (st->codec->codec_type != CODEC_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {
av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n");
st->need_parsing = AVSTREAM_PARSE_FULL;
}
}
return 0;
}
static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
{ { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },
{ { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
};
static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)
{
ByteIOContext *pb = mxf->fc->pb;
MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
uint64_t klv_end = url_ftell(pb) + klv->length;
if (!ctx)
return -1;
while (url_ftell(pb) + 4 < klv_end) {
int tag = get_be16(pb);
int size = get_be16(pb); /* KLV specified by 0x53 */
uint64_t next = url_ftell(pb) + size;
UID uid = {0};
if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
av_log(mxf->fc, AV_LOG_ERROR, "local tag 0x%04X with 0 size\n", tag);
continue;
}
if (tag > 0x7FFF) { /* dynamic tag */
int i;
for (i = 0; i < mxf->local_tags_count; i++) {
int local_tag = AV_RB16(mxf->local_tags+i*18);
if (local_tag == tag) {
memcpy(uid, mxf->local_tags+i*18+2, 16);
dprintf(mxf->fc, "local tag 0x%04X\n", local_tag);
PRINT_KEY(mxf->fc, "uid", uid);
}
}
}
if (ctx_size && tag == 0x3C0A)
get_buffer(pb, ctx->uid, 16);
else if (read_child(ctx, pb, tag, size, uid) < 0)
return -1;
url_fseek(pb, next, SEEK_SET);
}
if (ctx_size) ctx->type = type;
return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
}
static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
MXFContext *mxf = s->priv_data;
KLVPacket klv;
if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {
av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
return -1;
}
url_fseek(s->pb, -14, SEEK_CUR);
mxf->fc = s;
while (!url_feof(s->pb)) {
const MXFMetadataReadTableEntry *metadata;
if (klv_read_packet(&klv, s->pb) < 0)
return -1;
PRINT_KEY(s, "read header", klv.key);
if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
/* FIXME avoid seek */
url_fseek(s->pb, klv.offset, SEEK_SET);
break;
}
for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
if (IS_KLV_KEY(klv.key, metadata->key)) {
int (*read)() = klv.key[5] == 0x53 ? mxf_read_local_tags : metadata->read;
if (read(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) {
av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
return -1;
}
break;
}
}
if (!metadata->read)
url_fskip(s->pb, klv.length);
}
return mxf_parse_structural_metadata(mxf);
}
static int mxf_read_close(AVFormatContext *s)
{
MXFContext *mxf = s->priv_data;
int i;
av_freep(&mxf->packages_refs);
for (i = 0; i < mxf->metadata_sets_count; i++) {
switch (mxf->metadata_sets[i]->type) {
case MultipleDescriptor:
av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
break;
case Sequence:
av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
break;
case SourcePackage:
case MaterialPackage:
av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
break;
case Track:
mxf->metadata_sets[i] = NULL; /* will be freed later */
break;
default:
break;
}
av_freep(&mxf->metadata_sets[i]);
}
av_freep(&mxf->metadata_sets);
av_freep(&mxf->aesc);
av_freep(&mxf->local_tags);
return 0;
}
static int mxf_probe(AVProbeData *p) {
uint8_t *bufp = p->buf;
uint8_t *end = p->buf + p->buf_size;
if (p->buf_size < sizeof(mxf_header_partition_pack_key))
return 0;
/* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
end -= sizeof(mxf_header_partition_pack_key);
for (; bufp < end; bufp++) {
if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
return AVPROBE_SCORE_MAX;
}
return 0;
}
/* rudimentary byte seek */
/* XXX: use MXF Index */
static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
{
AVStream *st = s->streams[stream_index];
int64_t seconds;
if (!s->bit_rate)
return -1;
if (sample_time < 0)
sample_time = 0;
seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
av_update_cur_dts(s, st, sample_time);
return 0;
}
AVInputFormat mxf_demuxer = {
"mxf",
NULL_IF_CONFIG_SMALL("Material eXchange Format"),
sizeof(MXFContext),
mxf_probe,
mxf_read_header,
mxf_read_packet,
mxf_read_close,
mxf_read_seek,
};