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Fix frame height vs field height confusion in MXF decoding.

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Reviewed-by: Tomas Härdin <tomas.hardin@codemill.se>
Reveiwed-by: Baptiste Coudurier <baptiste.coudurier@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Joseph Artsimovich 2012-02-07 10:48:43 +00:00 committed by Michael Niedermayer
parent 4ed0d182e2
commit 84b9b4aa18
2 changed files with 33 additions and 2 deletions
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8
libavformat/mxf.h
View File

@ -46,6 +46,14 @@ enum MXFMetadataSetType {
TypeBottom,// add metadata type before this
};
enum MXFFrameLayout {
FullFrame = 0,
MixedFields,
OneField,
SegmentedFrame,
SeparateFields
};
typedef struct {
UID key;
int64_t offset;

27
libavformat/mxfdec.c
View File

@ -142,7 +142,8 @@ typedef struct {
AVRational sample_rate;
AVRational aspect_ratio;
int width;
int height;
int height; /* Field height, not frame height */
int frame_layout; /* See MXFFrameLayout enum */
int channels;
int bits_per_sample;
unsigned int component_depth;
@ -832,6 +833,9 @@ static int mxf_read_generic_descriptor(void *arg, AVIOContext *pb, int tag, int
case 0x3202:
descriptor->height = avio_rb32(pb);
break;
case 0x320C:
descriptor->frame_layout = avio_r8(pb);
break;
case 0x320E:
descriptor->aspect_ratio.num = avio_rb32(pb);
descriptor->aspect_ratio.den = avio_rb32(pb);
@ -1493,7 +1497,26 @@ static int mxf_parse_structural_metadata(MXFContext *mxf)
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->height = descriptor->height; /* Field height, not frame height */
switch (descriptor->frame_layout) {
case SegmentedFrame:
/* This one is a weird layout I don't fully understand. */
av_log(mxf->fc, AV_LOG_INFO, "SegmentedFrame layout isn't currently supported\n");
break;
case FullFrame:
break;
case OneField:
/* Every other line is stored and needs to be duplicated. */
av_log(mxf->fc, AV_LOG_INFO, "OneField frame layout isn't currently supported\n");
break; /* The correct thing to do here is fall through, but by breaking we might be
able to decode some streams at half the vertical resolution, rather than not al all.
It's also for compatibility with the old behavior. */
case SeparateFields:
case MixedFields:
st->codec->height *= 2; /* Turn field height into frame height. */
default:
av_log(mxf->fc, AV_LOG_INFO, "Unknown frame layout type: %d\n", descriptor->frame_layout);
}
if (st->codec->codec_id == CODEC_ID_RAWVIDEO) {
st->codec->pix_fmt = descriptor->pix_fmt;
if (st->codec->pix_fmt == PIX_FMT_NONE) {