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mxf: add cli option in mxfenc to replace GOP timecode parsing.

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This is based on the original work by Baptiste Coudurier.
pull/2/head
Clément Bœsch 14 years ago committed by Clément Bœsch
parent 4c3c6e60f9
commit b33ca05b46
2 changed files with 26 additions and 23 deletions
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  1. 47
      libavformat/mxfenc.c
  2. 2
      tests/lavf-regression.sh

47
libavformat/mxfenc.c
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@ -35,6 +35,7 @@
#include <math.h>
#include <time.h>
#include "libavutil/opt.h"
#include "libavutil/random_seed.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/timecode.h"
@ -172,6 +173,7 @@ static const MXFContainerEssenceEntry mxf_essence_container_uls[] = {
};
typedef struct MXFContext {
AVClass *av_class;
int64_t footer_partition_offset;
int essence_container_count;
AVRational time_base;
@ -185,10 +187,9 @@ typedef struct MXFContext {
unsigned body_partitions_count;
int last_key_index; ///< index of last key frame
uint64_t duration;
struct ff_timecode tc;
AVStream *timecode_track;
int timecode_base; ///< rounded time code base (25 or 30)
int timecode_start; ///< frame number computed from mpeg-2 gop header timecode
int timecode_drop_frame; ///< time code use drop frame method frop mpeg-2 essence gop header
int edit_unit_byte_count; ///< fixed edit unit byte count
uint64_t body_offset;
uint32_t instance_number;
@ -666,7 +667,7 @@ static void mxf_write_timecode_component(AVFormatContext *s, AVStream *st, enum
// Start Time Code
mxf_write_local_tag(pb, 8, 0x1501);
avio_wb64(pb, mxf->timecode_start);
avio_wb64(pb, mxf->tc.start);
// Rounded Time Code Base
mxf_write_local_tag(pb, 2, 0x1502);
@ -674,7 +675,7 @@ static void mxf_write_timecode_component(AVFormatContext *s, AVStream *st, enum
// Drop Frame
mxf_write_local_tag(pb, 1, 0x1503);
avio_w8(pb, mxf->timecode_drop_frame);
avio_w8(pb, mxf->tc.drop);
}
static void mxf_write_structural_component(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
@ -1310,7 +1311,6 @@ static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st,
AVPacket *pkt, MXFIndexEntry *e)
{
MXFStreamContext *sc = st->priv_data;
MXFContext *mxf = s->priv_data;
uint32_t c = -1;
int i;
@ -1330,21 +1330,6 @@ static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st,
if (e->flags & 0x40) // sequence header present
e->flags |= 0x80; // random access
}
if (!mxf->header_written) {
unsigned hours = (pkt->data[i+1]>>2) & 0x1f;
unsigned minutes = ((pkt->data[i+1] & 0x03) << 4) | (pkt->data[i+2]>>4);
unsigned seconds = ((pkt->data[i+2] & 0x07) << 3) | (pkt->data[i+3]>>5);
unsigned frames = ((pkt->data[i+3] & 0x1f) << 1) | (pkt->data[i+4]>>7);
mxf->timecode_drop_frame = !!(pkt->data[i+1] & 0x80);
mxf->timecode_start = (hours*3600 + minutes*60 + seconds) *
mxf->timecode_base + frames;
if (mxf->timecode_drop_frame) {
unsigned tminutes = 60 * hours + minutes;
mxf->timecode_start -= 2 * (tminutes - tminutes / 10);
}
av_log(s, AV_LOG_DEBUG, "frame %d %d:%d:%d%c%d\n", mxf->timecode_start,
hours, minutes, seconds, mxf->timecode_drop_frame ? ';':':', frames);
}
} else if (c == 0x1b3) { // seq
e->flags |= 0x40;
switch ((pkt->data[i+4]>>4) & 0xf) {
@ -1440,6 +1425,12 @@ static int mxf_write_header(AVFormatContext *s)
return -1;
}
av_set_pts_info(st, 64, mxf->time_base.num, mxf->time_base.den);
if (mxf->tc.str) {
mxf->tc.rate.num = mxf->time_base.den;
mxf->tc.rate.den = mxf->time_base.num;
if (ff_init_smtpe_timecode(s, &mxf->tc) < 0)
return -1;
}
if (s->oformat == &ff_mxf_d10_muxer) {
if (st->codec->bit_rate == 50000000)
if (mxf->time_base.den == 25) sc->index = 3;
@ -1554,7 +1545,7 @@ static void mxf_write_system_item(AVFormatContext *s)
unsigned frame;
uint32_t time_code;
frame = mxf->timecode_start + mxf->last_indexed_edit_unit + mxf->edit_units_count;
frame = mxf->tc.start + mxf->last_indexed_edit_unit + mxf->edit_units_count;
// write system metadata pack
avio_write(pb, system_metadata_pack_key, 16);
@ -1576,7 +1567,7 @@ static void mxf_write_system_item(AVFormatContext *s)
avio_w8(pb, 0x81); // SMPTE 12M time code
time_code = ff_framenum_to_smtpe_timecode(frame, mxf->timecode_base,
mxf->timecode_drop_frame);
mxf->tc.drop);
avio_wb32(pb, time_code);
avio_wb32(pb, 0); // binary group data
avio_wb64(pb, 0);
@ -1873,6 +1864,16 @@ static int mxf_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int
mxf_interleave_get_packet, mxf_compare_timestamps);
}
static const AVClass class = {
.class_name = "mxf",
.item_name = av_default_item_name,
.version = LIBAVUTIL_VERSION_INT,
.option = (const AVOption[]){
{TIMECODE_OPT(MXFContext, AV_OPT_FLAG_ENCODING_PARAM)},
{NULL}
},
};
AVOutputFormat ff_mxf_muxer = {
.name = "mxf",
.long_name = NULL_IF_CONFIG_SMALL("Material eXchange Format"),
@ -1886,6 +1887,7 @@ AVOutputFormat ff_mxf_muxer = {
.write_trailer = mxf_write_footer,
.flags = AVFMT_NOTIMESTAMPS,
.interleave_packet = mxf_interleave,
.priv_class = &class,
};
AVOutputFormat ff_mxf_d10_muxer = {
@ -1900,4 +1902,5 @@ AVOutputFormat ff_mxf_d10_muxer = {
.write_trailer = mxf_write_footer,
.flags = AVFMT_NOTIMESTAMPS,
.interleave_packet = mxf_interleave,
.priv_class = &class,
};

2
tests/lavf-regression.sh
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@ -63,7 +63,7 @@ do_lavf mpg
fi
if [ -n "$do_mxf" ] ; then
do_lavf mxf "-ar 48000 -bf 2 -timecode_frame_start 264363"
do_lavf mxf "-ar 48000 -bf 2 -timecode 02:56:14:13"
fi
if [ -n "$do_mxf_d10" ]; then

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