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Code Issues Releases Activity

avformat/iamfdec: swap back and side streams if both are present

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Layouts with both pairs (7.1, 7.1.2, etc) in IAMF that follow the definition in
ITU-R BS.2051-3 for Systems I and J also follow its ordering. This means side
comes before back, which is the inverse of how it's defined in AVChannel.

To workaround this without having to use custom order channel layouts, swap the
stream ids in the input IAMF structure, so packets for one are mapped to the
other.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2024-12-30 17:04:45 -03:00
parent c089c158d6
commit 547408ce1d
3 changed files with 48 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
libavformat/iamfdec.c
View File

@ -81,7 +81,10 @@ static int iamf_read_header(AVFormatContext *s)
for (int i = 0; i < iamf->nb_audio_elements; i++) {
IAMFAudioElement *audio_element = iamf->audio_elements[i];
const AVIAMFLayer *layer = audio_element->element->layers[audio_element->nb_layers - 1];
AVStreamGroup *stg = avformat_stream_group_create(s, AV_STREAM_GROUP_PARAMS_IAMF_AUDIO_ELEMENT, NULL);
int coupled_substream_count = audio_element->layers[audio_element->nb_layers - 1].coupled_substream_count;
int side_substream_id = -1, back_substream_id = -1;
if (!stg)
return AVERROR(ENOMEM);
@ -92,7 +95,7 @@ static int iamf_read_header(AVFormatContext *s)
stg->params.iamf_audio_element = audio_element->element;
audio_element->element = NULL;
for (int j = 0; j < audio_element->nb_substreams; j++) {
for (int j = 0, k = 0; j < audio_element->nb_substreams; j++) {
IAMFSubStream *substream = &audio_element->substreams[j];
AVStream *st = avformat_new_stream(s, NULL);
@ -111,8 +114,27 @@ static int iamf_read_header(AVFormatContext *s)
st->disposition |= AV_DISPOSITION_DEFAULT;
else if (audio_element->nb_layers > 1 || audio_element->layers[0].substream_count > 1)
st->disposition |= AV_DISPOSITION_DEPENDENT;
if (k == av_channel_layout_index_from_channel(&layer->ch_layout, AV_CHAN_BACK_LEFT))
back_substream_id = j;
else if (k == av_channel_layout_index_from_channel(&layer->ch_layout, AV_CHAN_SIDE_LEFT))
side_substream_id = j;
st->id = substream->audio_substream_id;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
k += 1 + (coupled_substream_count-- > 0);
}
// Swap back and side stream ids as our native channel layout ordering doen't match the
// order from ITU-R - BS.2051-3 for Systems I and J (where side channels come before back ones).
if (back_substream_id >= 0 && av_channel_layout_compare(&layer->ch_layout,
&(AVChannelLayout)AV_CHANNEL_LAYOUT_9POINT1POINT6)) {
const IAMFSubStream *back_substream = &audio_element->substreams[back_substream_id];
const IAMFSubStream *side_substream = &audio_element->substreams[side_substream_id];
AVStream *back_st = stg->streams[back_substream_id];
AVStream *side_st = stg->streams[side_substream_id];
back_st->id = side_substream->audio_substream_id;
side_st->id = back_substream->audio_substream_id;
}
}

2
libavformat/version.h
View File

@ -32,7 +32,7 @@
#include "version_major.h"
#define LIBAVFORMAT_VERSION_MINOR 9
#define LIBAVFORMAT_VERSION_MICRO 103
#define LIBAVFORMAT_VERSION_MICRO 104
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \

48
tests/ref/fate/iamf-7_1_4
View File

@ -45,72 +45,72 @@
0, 0, 0, 4608, 1399, 0x6e89566e
1, 0, 0, 4608, 1399, 0x6e89566e
2, 0, 0, 4608, 1396, 0x0dcb5677
3, 0, 0, 4608, 1396, 0x0dcb5677
3, 0, 0, 4608, 1399, 0x6e89566e
4, 0, 0, 4608, 1399, 0x6e89566e
5, 0, 0, 4608, 1399, 0x6e89566e
5, 0, 0, 4608, 1396, 0x0dcb5677
6, 0, 0, 4608, 1399, 0x6e89566e
0, 4608, 4608, 4608, 1442, 0x6c3c5b13
1, 4608, 4608, 4608, 1442, 0x6c3c5b13
2, 4608, 4608, 4608, 1439, 0xc46b5ac5
3, 4608, 4608, 4608, 1439, 0xc46b5ac5
3, 4608, 4608, 4608, 1442, 0x6c3c5b13
4, 4608, 4608, 4608, 1442, 0x6c3c5b13
5, 4608, 4608, 4608, 1442, 0x6c3c5b13
5, 4608, 4608, 4608, 1439, 0xc46b5ac5
6, 4608, 4608, 4608, 1442, 0x6c3c5b13
0, 9216, 9216, 4608, 1380, 0xc497571b
1, 9216, 9216, 4608, 1380, 0xc497571b
2, 9216, 9216, 4608, 1377, 0x5b2a55fe
3, 9216, 9216, 4608, 1377, 0x5b2a55fe
3, 9216, 9216, 4608, 1380, 0xc497571b
4, 9216, 9216, 4608, 1380, 0xc497571b
5, 9216, 9216, 4608, 1380, 0xc497571b
5, 9216, 9216, 4608, 1377, 0x5b2a55fe
6, 9216, 9216, 4608, 1380, 0xc497571b
0, 13824, 13824, 4608, 1383, 0x48e9510f
1, 13824, 13824, 4608, 1383, 0x48e9510f
2, 13824, 13824, 4608, 1380, 0x045550d3
3, 13824, 13824, 4608, 1380, 0x045550d3
3, 13824, 13824, 4608, 1383, 0x48e9510f
4, 13824, 13824, 4608, 1383, 0x48e9510f
5, 13824, 13824, 4608, 1383, 0x48e9510f
5, 13824, 13824, 4608, 1380, 0x045550d3
6, 13824, 13824, 4608, 1383, 0x48e9510f
0, 18432, 18432, 4608, 1572, 0x9a514719
1, 18432, 18432, 4608, 1572, 0x9a514719
2, 18432, 18432, 4608, 1568, 0xa2bc45f4
3, 18432, 18432, 4608, 1568, 0xa2bc45f4
3, 18432, 18432, 4608, 1572, 0x9a514719
4, 18432, 18432, 4608, 1572, 0x9a514719
5, 18432, 18432, 4608, 1572, 0x9a514719
5, 18432, 18432, 4608, 1568, 0xa2bc45f4
6, 18432, 18432, 4608, 1572, 0x9a514719
0, 23040, 23040, 4608, 1391, 0x74ac5014
1, 23040, 23040, 4608, 1391, 0x74ac5014
2, 23040, 23040, 4608, 1388, 0x96c85007
3, 23040, 23040, 4608, 1388, 0x96c85007
3, 23040, 23040, 4608, 1391, 0x74ac5014
4, 23040, 23040, 4608, 1391, 0x74ac5014
5, 23040, 23040, 4608, 1391, 0x74ac5014
5, 23040, 23040, 4608, 1388, 0x96c85007
6, 23040, 23040, 4608, 1391, 0x74ac5014
0, 27648, 27648, 4608, 1422, 0x2f9d47c5
1, 27648, 27648, 4608, 1422, 0x2f9d47c5
2, 27648, 27648, 4608, 1419, 0x4d4d466a
3, 27648, 27648, 4608, 1419, 0x4d4d466a
3, 27648, 27648, 4608, 1422, 0x2f9d47c5
4, 27648, 27648, 4608, 1422, 0x2f9d47c5
5, 27648, 27648, 4608, 1422, 0x2f9d47c5
5, 27648, 27648, 4608, 1419, 0x4d4d466a
6, 27648, 27648, 4608, 1422, 0x2f9d47c5
0, 32256, 32256, 4608, 1768, 0x2a044b99
1, 32256, 32256, 4608, 1768, 0x2a044b99
2, 32256, 32256, 4608, 1765, 0xacb84b24
3, 32256, 32256, 4608, 1765, 0xacb84b24
3, 32256, 32256, 4608, 1768, 0x2a044b99
4, 32256, 32256, 4608, 1768, 0x2a044b99
5, 32256, 32256, 4608, 1768, 0x2a044b99
5, 32256, 32256, 4608, 1765, 0xacb84b24
6, 32256, 32256, 4608, 1768, 0x2a044b99
0, 36864, 36864, 4608, 1534, 0xb0b35a3f
1, 36864, 36864, 4608, 1534, 0xb0b35a3f
2, 36864, 36864, 4608, 1531, 0x996458aa
3, 36864, 36864, 4608, 1531, 0x996458aa
3, 36864, 36864, 4608, 1534, 0xb0b35a3f
4, 36864, 36864, 4608, 1534, 0xb0b35a3f
5, 36864, 36864, 4608, 1534, 0xb0b35a3f
5, 36864, 36864, 4608, 1531, 0x996458aa
6, 36864, 36864, 4608, 1534, 0xb0b35a3f
0, 41472, 41472, 4608, 926, 0xc26a5eae
1, 41472, 41472, 4608, 926, 0xc26a5eae
2, 41472, 41472, 4608, 923, 0xa7225edf
3, 41472, 41472, 4608, 923, 0xa7225edf
3, 41472, 41472, 4608, 926, 0xc26a5eae
4, 41472, 41472, 4608, 926, 0xc26a5eae
5, 41472, 41472, 4608, 926, 0xc26a5eae
5, 41472, 41472, 4608, 923, 0xa7225edf
6, 41472, 41472, 4608, 926, 0xc26a5eae
[STREAM_GROUP]
index=0
@ -226,7 +226,7 @@ DISPOSITION:multilayer=0
[/STREAM]
[STREAM]
index=3
id=0x3
id=0x5
DISPOSITION:default=0
DISPOSITION:dub=0
DISPOSITION:original=0
@ -272,7 +272,7 @@ DISPOSITION:multilayer=0
[/STREAM]
[STREAM]
index=5
id=0x5
id=0x3
DISPOSITION:default=0
DISPOSITION:dub=0
DISPOSITION:original=0
@ -462,7 +462,7 @@ DISPOSITION:multilayer=0
[/STREAM]
[STREAM]
index=3
id=0x3
id=0x5
DISPOSITION:default=0
DISPOSITION:dub=0
DISPOSITION:original=0
@ -508,7 +508,7 @@ DISPOSITION:multilayer=0
[/STREAM]
[STREAM]
index=5
id=0x5
id=0x3
DISPOSITION:default=0
DISPOSITION:dub=0
DISPOSITION:original=0