[Ffmpeg-cvslog] r5826 - in trunk: Changelog MAINTAINERS libavformat/Makefile libavformat/allformats.c libavformat/allformats.h libavformat/mxf.c
bcoudurier
subversion
Tue Jul 25 16:30:15 CEST 2006
Author: bcoudurier
Date: Tue Jul 25 16:30:14 2006
New Revision: 5826
Added:
trunk/libavformat/mxf.c
Modified:
trunk/Changelog
trunk/MAINTAINERS
trunk/libavformat/Makefile
trunk/libavformat/allformats.c
trunk/libavformat/allformats.h
Log:
MXF demuxer
Modified: trunk/Changelog
==============================================================================
--- trunk/Changelog (original)
+++ trunk/Changelog Tue Jul 25 16:30:14 2006
@@ -51,6 +51,7 @@
- GXF demuxer
- Chinese AVS decoder
- GXF muxer
+- MXF demuxer
version 0.4.9-pre1:
Modified: trunk/MAINTAINERS
==============================================================================
--- trunk/MAINTAINERS (original)
+++ trunk/MAINTAINERS Tue Jul 25 16:30:14 2006
@@ -198,6 +198,7 @@
img2.c Michael Niedermayer
mov.c Francois Revol, Michael Niedermayer
mpegts* Mans Rullgard
+ mxf.c Baptiste Coudurier
nsvdec.c Francois Revol
nut.c Alex Beregszaszi
nuv.c Reimar Doeffinger
Modified: trunk/libavformat/Makefile
==============================================================================
--- trunk/libavformat/Makefile (original)
+++ trunk/libavformat/Makefile Tue Jul 25 16:30:14 2006
@@ -75,6 +75,7 @@
OBJS-$(CONFIG_MPEGTS_DEMUXER) += mpegts.o
OBJS-$(CONFIG_MPEGTS_MUXER) += mpegtsenc.o
OBJS-$(CONFIG_MPJPEG_MUXER) += mpjpeg.o
+OBJS-$(CONFIG_MXF_DEMUXER) += mxf.o
OBJS-$(CONFIG_NSV_DEMUXER) += nsvdec.o riff.o
OBJS-$(CONFIG_NUT_DEMUXER) += nut.o riff.o
OBJS-$(CONFIG_NUT_MUXER) += nut.o riff.o
Modified: trunk/libavformat/allformats.c
==============================================================================
--- trunk/libavformat/allformats.c (original)
+++ trunk/libavformat/allformats.c Tue Jul 25 16:30:14 2006
@@ -240,6 +240,9 @@
#ifdef CONFIG_MPJPEG_MUXER
av_register_output_format(&mpjpeg_muxer);
#endif
+#ifdef CONFIG_MXF_DEMUXER
+ av_register_input_format(&mxf_demuxer);
+#endif
#ifdef CONFIG_NSV_DEMUXER
av_register_input_format(&nsv_demuxer);
#endif
Modified: trunk/libavformat/allformats.h
==============================================================================
--- trunk/libavformat/allformats.h (original)
+++ trunk/libavformat/allformats.h Tue Jul 25 16:30:14 2006
@@ -69,6 +69,7 @@
extern AVInputFormat mpegts_demuxer;
extern AVOutputFormat mpegts_muxer;
extern AVOutputFormat mpjpeg_muxer;
+extern AVInputFormat mxf_demuxer;
extern AVInputFormat nsv_demuxer;
extern AVInputFormat nut_demuxer;
extern AVOutputFormat nut_muxer;
Added: trunk/libavformat/mxf.c
==============================================================================
--- (empty file)
+++ trunk/libavformat/mxf.c Tue Jul 25 16:30:14 2006
@@ -0,0 +1,508 @@
+/*
+ * MXF demuxer.
+ * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; 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 tracks does not contain Tracks numbers.
+ * Search for Descriptors (Picture, Sound) which contains codec info and parameters.
+ * Assign Descriptors to correct Tracks.
+ *
+ * Preliminary demuxer, only OP1A supported and some files might not work at all.
+ */
+
+//#define DEBUG
+
+#include "avformat.h"
+#include "dsputil.h"
+#include "riff.h"
+
+typedef struct {
+ AVStream *stream;
+ uint8_t track_uid[16];
+ uint8_t sequence_uid[16];
+ int track_id;
+ int track_number;
+} MXFTrack;
+
+typedef struct {
+ DECLARE_ALIGNED_16(uint8_t, essence_container[16]);
+ DECLARE_ALIGNED_16(uint8_t, essence_compression[16]);
+ enum CodecType codec_type;
+ AVRational sample_rate;
+ AVRational aspect_ratio;
+ int width;
+ int height;
+ int channels;
+ int bits_per_sample;
+ int block_align;
+ int linked_track_id;
+ int kind;
+} MXFDescriptor;
+
+typedef struct {
+ AVFormatContext *fc;
+ MXFTrack *tracks;
+ MXFDescriptor *descriptors;
+ int descriptors_count;
+ int tracks_count;
+} MXFContext;
+
+typedef struct {
+ DECLARE_ALIGNED_16(uint8_t, key[16]);
+ offset_t offset;
+ uint64_t length;
+} KLVPacket;
+
+static const uint8_t mxf_metadata_source_package_key[] = { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x53, 0x01, 0x01, 0x0d, 0x01, 0x01, 0x01, 0x01, 0x01, 0x37, 0x00 };
+static const uint8_t mxf_metadata_sequence_key[] = { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x53, 0x01, 0x01, 0x0d, 0x01, 0x01, 0x01, 0x01, 0x01, 0x0F, 0x00 };
+static const uint8_t mxf_metadata_generic_sound_descriptor_key[] = { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x53, 0x01, 0x01, 0x0d, 0x01, 0x01, 0x01, 0x01, 0x01, 0x42, 0x00 };
+static const uint8_t mxf_metadata_cdci_descriptor_key[] = { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x53, 0x01, 0x01, 0x0d, 0x01, 0x01, 0x01, 0x01, 0x01, 0x28, 0x00 };
+static const uint8_t mxf_metadata_mpegvideo_descriptor_key[] = { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x53, 0x01, 0x01, 0x0d, 0x01, 0x01, 0x01, 0x01, 0x01, 0x51, 0x00 };
+static const uint8_t mxf_metadata_wave_descriptor_key[] = { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x53, 0x01, 0x01, 0x0d, 0x01, 0x01, 0x01, 0x01, 0x01, 0x48, 0x00 };
+static const uint8_t mxf_metadata_track_key[] = { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x53, 0x01, 0x01, 0x0d, 0x01, 0x01, 0x01, 0x01, 0x01, 0x3b, 0x00 };
+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 };
+
+#define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
+
+#define PRINT_KEY(x) \
+do { \
+ int iterpk; \
+ for (iterpk = 0; iterpk < 16; iterpk++) { \
+ av_log(NULL, AV_LOG_DEBUG, "%02X ", x[iterpk]); \
+ } \
+ av_log(NULL, AV_LOG_DEBUG, "\n"); \
+} while (0); \
+
+static int64_t klv_decode_ber_length(ByteIOContext *pb)
+{
+ int64_t size = 0;
+ uint8_t length = get_byte(pb);
+ int type = length >> 7;
+
+ if (type) { /* long form */
+ int bytes_num = length & 0x7f;
+ /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
+ if (bytes_num > 8)
+ return -1;
+ while (bytes_num--)
+ size = size << 8 | get_byte(pb);
+ } else {
+ size = length & 0x7f;
+ }
+ return size;
+}
+
+static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
+{
+ klv->offset = url_ftell(pb);
+ get_buffer(pb, klv->key, 16);
+ klv->length = klv_decode_ber_length(pb);
+ if (klv->length == -1)
+ return -1;
+ else
+ return 0;
+}
+
+static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
+{
+ int id = BE_32(klv->key + 12); /* SMPTE 379M 7.3 */
+ int i;
+
+ for (i = 0; i < s->nb_streams; i++) {
+ if (s->streams[i]->id == id)
+ return i;
+ }
+ return -1;
+}
+
+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;
+ if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
+ av_get_packet(&s->pb, pkt, klv.length);
+ pkt->stream_index = mxf_get_stream_index(s, &klv);
+ if (pkt->stream_index == -1)
+ return -1;
+ return 0;
+ } else
+ url_fskip(&s->pb, klv.length);
+ }
+ return AVERROR_IO;
+}
+
+static int mxf_read_metadata_track(MXFContext *mxf, KLVPacket *klv)
+{
+ ByteIOContext *pb = &mxf->fc->pb;
+ AVRational time_base = (AVRational){0, 0};
+ uint8_t sequence_uid[16];
+ uint8_t track_uid[16];
+ int track_number = 0;
+ int track_id = 0;
+ int bytes_read = 0;
+ int i;
+
+ while (bytes_read < klv->length) {
+ int tag = get_be16(pb);
+ int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
+
+ switch (tag) {
+ case 0x4801:
+ track_id = get_be32(pb);
+ break;
+ case 0x4804:
+ track_number = get_be32(pb);
+ break;
+ case 0x4B01:
+ time_base.den = get_be32(pb);
+ time_base.num = get_be32(pb);
+ break;
+ case 0x4803:
+ get_buffer(pb, sequence_uid, 16);
+ break;
+ case 0x3C0A:
+ get_buffer(pb, track_uid, 16);
+ break;
+ default:
+ url_fskip(pb, size);
+ }
+ bytes_read += size + 4;
+ }
+ for (i = 0; i < mxf->tracks_count; i++)
+ if (!memcmp(track_uid, mxf->tracks[i].track_uid, 16)) {
+ mxf->tracks[i].track_id = track_id;
+ mxf->tracks[i].track_number = track_number;
+ mxf->tracks[i].stream->time_base = time_base;
+ mxf->tracks[i].stream->id = track_number;
+ memcpy(mxf->tracks[i].sequence_uid, sequence_uid, 16);
+ }
+ return bytes_read;
+}
+
+static int mxf_read_metadata_sequence(MXFContext *mxf, KLVPacket *klv)
+{
+ ByteIOContext *pb = &mxf->fc->pb;
+ uint8_t sequence_uid[16];
+ uint8_t data_definition[16];
+ uint64_t duration = 0;
+ int bytes_read = 0;
+ int i;
+
+ while (bytes_read < klv->length) {
+ int tag = get_be16(pb);
+ int size = get_be16(pb); /* KLV specified by 0x53 */
+
+ switch (tag) {
+ case 0x3C0A:
+ get_buffer(pb, sequence_uid, 16);
+ break;
+ case 0x0202:
+ duration = get_be64(pb);
+ break;
+ case 0x0201:
+ get_buffer(pb, data_definition, 16);
+ break;
+ default:
+ url_fskip(pb, size);
+ }
+ bytes_read += size + 4;
+ }
+
+ for (i = 0; i < mxf->tracks_count; i++)
+ if (!memcmp(sequence_uid, mxf->tracks[i].sequence_uid, 16)) {
+ mxf->tracks[i].stream->duration = duration;
+ if (data_definition[11] == 0x02 && data_definition[12] == 0x01)
+ mxf->tracks[i].stream->codec->codec_type = CODEC_TYPE_VIDEO;
+ else if (data_definition[11] == 0x02 && data_definition[12] == 0x02)
+ mxf->tracks[i].stream->codec->codec_type = CODEC_TYPE_AUDIO;
+ else if (data_definition[11] == 0x01) /* SMPTE 12M Time Code track */
+ mxf->tracks[i].stream->codec->codec_type = CODEC_TYPE_DATA;
+ }
+ return bytes_read;
+}
+
+static int mxf_read_metadata_source_package(MXFContext *mxf, KLVPacket *klv)
+{
+ ByteIOContext *pb = &mxf->fc->pb;
+ int tracks_count;
+ int bytes_read = 0;
+ int i;
+
+ while (bytes_read < klv->length) {
+ int tag = get_be16(pb);
+ int size = get_be16(pb); /* KLV specified by 0x53 */
+
+ switch (tag) {
+ case 0x4403:
+ tracks_count = get_be32(pb);
+ if(tracks_count >= UINT_MAX / sizeof(*mxf->tracks) ||
+ tracks_count >= UINT_MAX / sizeof(*mxf->descriptors))
+ return -1;
+ mxf->tracks_count += tracks_count; /* op2a contains multiple source packages */
+ mxf->tracks = av_realloc(mxf->tracks, mxf->tracks_count * sizeof(*mxf->tracks));
+ mxf->descriptors = av_realloc(mxf->descriptors, mxf->tracks_count * sizeof(*mxf->descriptors));
+ url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
+ for (i = mxf->tracks_count - tracks_count; i < mxf->tracks_count; i++) {
+ mxf->tracks[i].stream = av_new_stream(mxf->fc, 0);
+ get_buffer(pb, mxf->tracks[i].track_uid, 16);
+ }
+ break;
+ default:
+ url_fskip(pb, size);
+ }
+ bytes_read += size + 4;
+ }
+ return bytes_read;
+}
+
+static int mxf_read_metadata_descriptor(MXFContext *mxf, KLVPacket *klv)
+{
+ ByteIOContext *pb = &mxf->fc->pb;
+ MXFDescriptor *desc;
+ int bytes_read = 0;
+
+ if (mxf->descriptors_count == mxf->tracks_count)
+ return -1;
+ desc = &mxf->descriptors[mxf->descriptors_count++];
+ desc->kind = klv->key[14];
+ desc->linked_track_id = -1;
+
+ while (bytes_read < klv->length) {
+ int tag = get_be16(pb);
+ int size = get_be16(pb); /* KLV specified by 0x53 */
+
+ switch (tag) {
+ case 0x3004:
+ get_buffer(pb, desc->essence_container, 16);
+ break;
+ case 0x3006:
+ desc->linked_track_id = get_be32(pb);
+ break;
+ case 0x3201: /* PictureEssenceCoding */
+ desc->codec_type = CODEC_TYPE_VIDEO;
+ get_buffer(pb, desc->essence_compression, 16);
+ break;
+ case 0x3203:
+ desc->width = get_be32(pb);
+ break;
+ case 0x3202:
+ desc->height = get_be32(pb);
+ break;
+ case 0x320E:
+ desc->aspect_ratio.num = get_be32(pb);
+ desc->aspect_ratio.den = get_be32(pb);
+ break;
+ case 0x3D0A:
+ desc->block_align = get_be16(pb);
+ break;
+ case 0x3D03:
+ desc->sample_rate.num = get_be32(pb);
+ desc->sample_rate.den = get_be32(pb);
+ break;
+ case 0x3D06: /* SoundEssenceCompression */
+ desc->codec_type = CODEC_TYPE_AUDIO;
+ get_buffer(pb, desc->essence_compression, 16);
+ break;
+ case 0x3D07:
+ desc->channels = get_be32(pb);
+ break;
+ case 0x3D01:
+ desc->bits_per_sample = get_be32(pb);
+ break;
+ default:
+ url_fskip(pb, size);
+ }
+ bytes_read += size + 4;
+ }
+ return bytes_read;
+}
+
+/* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */
+static const CodecTag mxf_sound_essence_labels[] = {
+ { CODEC_ID_PCM_S16LE, 0x01000000 },/* Uncompressed Sound Coding */
+ { CODEC_ID_PCM_S16LE, 0x017F0000 },/* Uncompressed Sound Coding */
+ { CODEC_ID_PCM_S16BE, 0x017E0000 },/* Uncompressed Sound Coding Big Endian*/
+ { CODEC_ID_PCM_ALAW, 0x02030101 },
+ { CODEC_ID_AC3, 0x02030201 },
+ //{ CODEC_ID_MP1, 0x02030104 },
+ { CODEC_ID_MP2, 0x02030105 },/* MP2 or MP3 */
+ //{ CODEC_ID_MP2, 0x02030106 },/* MPEG-2 Layer 1 */
+ //{ CODEC_ID_???, 0x0203010C },/* Dolby E */
+ //{ CODEC_ID_???, 0x02030301 },/* MPEG-2 AAC */
+ { 0, 0 },
+};
+
+static const CodecTag mxf_picture_essence_labels[] = {
+ { CODEC_ID_RAWVIDEO, 0x0100 },
+ { CODEC_ID_MPEG2VIDEO, 0x0201 },
+ { CODEC_ID_DVVIDEO, 0x0202 },
+ //{ CODEC_ID_???, 0x0207 },/* D-11 HDCAM */
+ { 0, 0 },
+};
+
+static const CodecTag mxf_container_picture_labels[] = {
+ { CODEC_ID_MPEG2VIDEO, 0x0201 }, /* D-10 Mapping */
+ { CODEC_ID_DVVIDEO, 0x0202 }, /* DV Mapping */
+ //{ CODEC_ID_???, 0x0203 }, /* HDCAM D-11 Mapping */
+ { CODEC_ID_MPEG2VIDEO, 0x0204 }, /* MPEG ES Mapping */
+};
+
+static const CodecTag mxf_container_sound_labels[] = {
+ //{ CODEC_ID_PCM_S16??, 0x0201 }, /* D-10 Mapping */
+ { CODEC_ID_MP2, 0x0204 }, /* MPEG ES Mapping */
+ { CODEC_ID_PCM_S16LE, 0x0206 }, /* AES BWF Mapping */
+ { CODEC_ID_PCM_ALAW, 0x020A },
+ { 0, 0 },
+};
+
+static void mxf_resolve_track_descriptor(MXFContext *mxf)
+{
+ uint32_t container_label;
+ uint32_t essence_label;
+ int i, j;
+
+ for (i = 0; i < mxf->descriptors_count; i++) {
+ for (j = 0; j < mxf->tracks_count; j++) {
+ AVStream *st = mxf->tracks[j].stream;
+ MXFDescriptor *desc = &mxf->descriptors[i];
+
+ if ((desc->linked_track_id == -1 && st->codec->codec_type == desc->codec_type)
+ || desc->linked_track_id == mxf->tracks[j].track_id) {
+ if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
+ st->codec->channels = desc->channels;
+ st->codec->bits_per_sample = desc->bits_per_sample;
+ st->codec->block_align = desc->block_align;
+ st->codec->sample_rate = desc->sample_rate.num / desc->sample_rate.den;
+
+ container_label = BE_16(desc->essence_container + 12);
+ essence_label = BE_32(desc->essence_compression + 11);
+ st->codec->codec_id = codec_get_id(mxf_sound_essence_labels, essence_label);
+ if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
+ if (desc->bits_per_sample == 24)
+ st->codec->codec_id = CODEC_ID_PCM_S24LE;
+ else if (desc->bits_per_sample == 32)
+ st->codec->codec_id = CODEC_ID_PCM_S32LE;
+ }
+ if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
+ if (desc->bits_per_sample == 24)
+ st->codec->codec_id = CODEC_ID_PCM_S24BE;
+ else if (desc->bits_per_sample == 32)
+ st->codec->codec_id = CODEC_ID_PCM_S32BE;
+ }
+ if (!st->codec->codec_id)
+ st->codec->codec_id = codec_get_id(mxf_container_sound_labels, container_label);
+
+ } else if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
+ st->codec->width = desc->width;
+ st->codec->height = desc->height;
+
+ container_label = BE_16(desc->essence_container + 12);
+ essence_label = BE_16(desc->essence_compression + 11);
+ st->codec->codec_id = codec_get_id(mxf_picture_essence_labels, essence_label);
+ if (!st->codec->codec_id)
+ st->codec->codec_id = codec_get_id(mxf_container_picture_labels, container_label);
+ }
+ }
+ }
+ }
+}
+
+static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+ MXFContext *mxf = s->priv_data;
+ KLVPacket klv;
+ int ret = 0;
+
+ mxf->fc = s;
+ while (!url_feof(&s->pb)) {
+ if (klv_read_packet(&klv, &s->pb) < 0)
+ return -1;
+ if (IS_KLV_KEY(klv.key, mxf_metadata_track_key))
+ ret = mxf_read_metadata_track(mxf, &klv);
+ else if (IS_KLV_KEY(klv.key, mxf_metadata_source_package_key))
+ ret = mxf_read_metadata_source_package(mxf, &klv);
+ else if (IS_KLV_KEY(klv.key, mxf_metadata_sequence_key))
+ ret = mxf_read_metadata_sequence(mxf, &klv);
+ else if (IS_KLV_KEY(klv.key, mxf_metadata_wave_descriptor_key))
+ ret = mxf_read_metadata_descriptor(mxf, &klv);
+ else if (IS_KLV_KEY(klv.key, mxf_metadata_mpegvideo_descriptor_key))
+ ret = mxf_read_metadata_descriptor(mxf, &klv);
+ else if (IS_KLV_KEY(klv.key, mxf_metadata_cdci_descriptor_key))
+ ret = mxf_read_metadata_descriptor(mxf, &klv);
+ else if (IS_KLV_KEY(klv.key, mxf_metadata_generic_sound_descriptor_key))
+ ret = mxf_read_metadata_descriptor(mxf, &klv);
+ else if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
+ /* FIXME avoid seek */
+ url_fseek(&s->pb, klv.offset, SEEK_SET);
+ break;
+ } else
+ url_fskip(&s->pb, klv.length);
+ if (ret < 0)
+ return ret;
+ }
+ mxf_resolve_track_descriptor(mxf);
+ return 0;
+}
+
+static int mxf_read_close(AVFormatContext *s)
+{
+ MXFContext *mxf = s->priv_data;
+
+ av_freep(&mxf->tracks);
+ av_freep(&mxf->descriptors);
+ return 0;
+}
+
+static int mxf_probe(AVProbeData *p) {
+ /* KLV packet describing MXF header partition pack */
+ if (p->buf_size < sizeof(mxf_header_partition_pack_key))
+ return 0;
+
+ if (IS_KLV_KEY(p->buf, mxf_header_partition_pack_key))
+ return AVPROBE_SCORE_MAX;
+ else
+ return 0;
+}
+
+
+AVInputFormat mxf_demuxer = {
+ "mxf",
+ "MXF format",
+ sizeof(MXFContext),
+ mxf_probe,
+ mxf_read_header,
+ mxf_read_packet,
+ mxf_read_close,
+ NULL,
+};
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