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Merged
wader merged 1 commit into from
Dec 4, 2025
Merged

avc_nalu: Decode more frame and poc fields #1227

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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@ av1_obu,
avc_annexb,
[avc_au](doc/formats.md#avc_au),
avc_dcr,
avc_nalu,
[avc_nalu](doc/formats.md#avc_nalu),
avc_pps,
avc_sei,
avc_sps,
Expand Down
48 changes: 42 additions & 6 deletions doc/formats.md
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Expand Up @@ -19,7 +19,7 @@
|`avc_annexb` |H.264/AVC&nbsp;Annex&nbsp;B |<sub>`avc_nalu`</sub>|
|[`avc_au`](#avc_au) |H.264/AVC&nbsp;Access&nbsp;Unit |<sub>`avc_nalu`</sub>|
|`avc_dcr` |H.264/AVC&nbsp;Decoder&nbsp;Configuration&nbsp;Record |<sub>`avc_nalu`</sub>|
|`avc_nalu` |H.264/AVC&nbsp;Network&nbsp;Access&nbsp;Layer&nbsp;Unit |<sub>`avc_sps` `avc_pps` `avc_sei`</sub>|
|[`avc_nalu`](#avc_nalu) |H.264/AVC&nbsp;Network&nbsp;Access&nbsp;Layer&nbsp;Unit |<sub>`avc_sps` `avc_pps` `avc_sei`</sub>|
|`avc_pps` |H.264/AVC&nbsp;Picture&nbsp;Parameter&nbsp;Set |<sub></sub>|
|`avc_sei` |H.264/AVC&nbsp;Supplemental&nbsp;Enhancement&nbsp;Information |<sub></sub>|
|`avc_sps` |H.264/AVC&nbsp;Sequence&nbsp;Parameter&nbsp;Set |<sub></sub>|
Expand Down Expand Up @@ -262,20 +262,56 @@ H.264/AVC Access Unit.

### Options

|Name |Default|Description|
|- |- |-|
|`length_size`|0 |Length value size|
|Name |Default|Description|
|- |- |-|
|`bottom_field_pic_order_in_frame_present_flag`|false ||
|`delta_pic_order_always_zero_flag` |false ||
|`frame_mbs_only_flag` |true ||
|`length_size` |0 |Length value size|
|`log2max_frame_num` |4 ||
|`log2max_pic_order_cnt_lsb` |4 ||
|`pic_order_cnt_type` |0 ||
|`redundant_pic_cnt_present_flag` |false ||
|`separate_colour_plane_flag` |false ||

### Examples

Decode file using avc_au options
```
$ fq -d avc_au -o length_size=0 . file
$ fq -d avc_au -o bottom_field_pic_order_in_frame_present_flag=false -o delta_pic_order_always_zero_flag=false -o frame_mbs_only_flag=true -o length_size=0 -o log2max_frame_num=4 -o log2max_pic_order_cnt_lsb=4 -o pic_order_cnt_type=0 -o redundant_pic_cnt_present_flag=false -o separate_colour_plane_flag=false . file
```

Decode value as avc_au
```
... | avc_au({length_size:0})
... | avc_au({bottom_field_pic_order_in_frame_present_flag:false,delta_pic_order_always_zero_flag:false,frame_mbs_only_flag:true,length_size:0,log2max_frame_num:4,log2max_pic_order_cnt_lsb:4,pic_order_cnt_type:0,redundant_pic_cnt_present_flag:false,separate_colour_plane_flag:false})
```

## avc_nalu
H.264/AVC Network Access Layer Unit.

### Options

|Name |Default|Description|
|- |- |-|
|`bottom_field_pic_order_in_frame_present_flag`|false ||
|`delta_pic_order_always_zero_flag` |false ||
|`frame_mbs_only_flag` |true ||
|`log2max_frame_num` |4 ||
|`log2max_pic_order_cnt_lsb` |4 ||
|`pic_order_cnt_type` |0 ||
|`redundant_pic_cnt_present_flag` |false ||
|`separate_colour_plane_flag` |false ||

### Examples

Decode file using avc_nalu options
```
$ fq -d avc_nalu -o bottom_field_pic_order_in_frame_present_flag=false -o delta_pic_order_always_zero_flag=false -o frame_mbs_only_flag=true -o log2max_frame_num=4 -o log2max_pic_order_cnt_lsb=4 -o pic_order_cnt_type=0 -o redundant_pic_cnt_present_flag=false -o separate_colour_plane_flag=false . file
```

Decode value as avc_nalu
```
... | avc_nalu({bottom_field_pic_order_in_frame_present_flag:false,delta_pic_order_always_zero_flag:false,frame_mbs_only_flag:true,log2max_frame_num:4,log2max_pic_order_cnt_lsb:4,pic_order_cnt_type:0,redundant_pic_cnt_present_flag:false,separate_colour_plane_flag:false})
```

## avi
Expand Down
36 changes: 36 additions & 0 deletions format/format.go
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Expand Up @@ -198,10 +198,46 @@ type AAC_Frame_In struct {
}
type AVC_AU_In struct {
LengthSize uint64 `doc:"Length value size"`
AVC_SPS_Info
AVC_PPS_Info
}

type AVC_NALU_In struct {
AVC_SPS_Info
AVC_PPS_Info
}

type AVC_NALU_Out struct {
AVC_SPS_Info
AVC_PPS_Info
}

type AVC_DCR_Out struct {
LengthSize uint64
AVC_SPS_Info
AVC_PPS_Info
}

type AVC_PPS_Info struct {
BottomFieldPicOrderInFramePresentFlag bool `doc:""`
RedundantPicCntPresentFlag bool `doc:""`
}

type AVC_PPS_Out struct {
AVC_PPS_Info
}

type AVC_SPS_Info struct {
SeparateColourPlaneFlag bool `doc:""`
Log2MaxFrameNum uint64 `doc:""`
FrameMbsOnlyFlag bool `doc:""`
PicOrderCntType uint64 `doc:""`
Log2MaxPicOrderCntLsb uint64 `doc:""`
DeltaPicOrderAlwaysZeroFlag bool `doc:""`
}

type AVC_SPS_Out struct {
AVC_SPS_Info
}

type CAFF_In struct {
Expand Down
9 changes: 6 additions & 3 deletions format/matroska/testdata/avc.fqtest
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Expand Up @@ -476,13 +476,16 @@ $ fq -d matroska dv avc.mkv
0x0520|65 |e | forbidden_zero_bit: false 0x520-0x520.1 (0.1)
0x0520|65 |e | nal_ref_idc: 3 0x520.1-0x520.3 (0.2)
0x0520|65 |e | nal_unit_type: "idr_slice" (5) (Coded slice of an IDR picture) 0x520.3-0x521 (0.5)
| | | rbsp{}: 0x521-0x522.1 (1.1)
| | | rbsp{}: 0x521-0x523.4 (2.4)
0x0520| 88 | . | first_mb_in_slice: 0 0x521-0x521.1 (0.1)
0x0520| 88 | . | slice_type: "i" (7) 0x521.1-0x522 (0.7)
0x0520| 84 | . | pic_parameter_set_id: 0 0x522-0x522.1 (0.1)
0x0520| 84 00 2b ff fe f5 db f3 2c ac 66 67 3d ff| ..+.....,.fg=.| gap0: raw bits 0x522.1-0xd2b (2056.7)
0x0520| 84 | . | frame_num: 0 0x522.1-0x522.5 (0.4)
0x0520| 84 | . | idr_pic_id: 0 0x522.5-0x522.6 (0.1)
0x0520| 84 00 | .. | pic_order_cnt_lsb: 0 0x522.6-0x523.4 (0.6)
0x0520| 00 2b ff fe f5 db f3 2c ac 66 67 3d ff| .+.....,.fg=.| gap0: raw bits 0x523.4-0xd2b (2055.4)
0x0530|ed 3b 60 00 21 74 ff c0 cf 1f fc 67 ff cd 99 a7|.;`.!t.....g....|
* |until 0xd2a.7 (2057) | |
* |until 0xd2a.7 (2056) | |
| | | [6]{}: element 0xd2b-0xd47 (28)
0x0d20| 1c 53 bb 6b | .S.k | id: "cues" (0x1c53bb6b) (A Top-Level Element to speed seeking access) 0xd2b-0xd2f (4)
| | | type: "master"
Expand Down
28 changes: 18 additions & 10 deletions format/mp4/testdata/avc.fqtest
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Expand Up @@ -479,40 +479,48 @@ $ fq -d mp4 dv avc.mp4
0x02e0| 65 | e | forbidden_zero_bit: false 0x2e5-0x2e5.1 (0.1)
0x02e0| 65 | e | nal_ref_idc: 3 0x2e5.1-0x2e5.3 (0.2)
0x02e0| 65 | e | nal_unit_type: "idr_slice" (5) (Coded slice of an IDR picture) 0x2e5.3-0x2e6 (0.5)
| | | rbsp{}: 0x2e6-0x2e7.1 (1.1)
| | | rbsp{}: 0x2e6-0x2e8.4 (2.4)
0x02e0| 88 | . | first_mb_in_slice: 0 0x2e6-0x2e6.1 (0.1)
0x02e0| 88 | . | slice_type: "i" (7) 0x2e6.1-0x2e7 (0.7)
0x02e0| 84 | . | pic_parameter_set_id: 0 0x2e7-0x2e7.1 (0.1)
0x02e0| 84 00 33 ff fe f6 86 f8 14| ..3......| gap0: raw bits 0x2e7.1-0xbfc (2324.7)
0x02e0| 84 | . | frame_num: 0 0x2e7.1-0x2e7.5 (0.4)
0x02e0| 84 | . | idr_pic_id: 0 0x2e7.5-0x2e7.6 (0.1)
0x02e0| 84 00 | .. | pic_order_cnt_lsb: 0 0x2e7.6-0x2e8.4 (0.6)
0x02e0| 00 33 ff fe f6 86 f8 14| .3......| gap0: raw bits 0x2e8.4-0xbfc (2323.4)
0x02f0|d8 53 23 af ff f2 50 06 7f 30 02 17 55 d4 5a 6f|.S#...P..0..U.Zo|
* |until 0xbfb.7 (2325) | |
* |until 0xbfb.7 (2324) | |
|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef| [1][0:1]: sample (avc_au) 0xbfc-0xd49 (333)
| | | [0]{}: nalu 0xbfc-0xd49 (333)
0x0bf0| 00 00 01 49| ...I| length: 329 0xbfc-0xc00 (4)
|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef| nalu{}: (avc_nalu) 0xc00-0xd49 (329)
0x0c00|41 |A | forbidden_zero_bit: false 0xc00-0xc00.1 (0.1)
0x0c00|41 |A | nal_ref_idc: 2 0xc00.1-0xc00.3 (0.2)
0x0c00|41 |A | nal_unit_type: "slice" (1) (Coded slice of a non-IDR picture) 0xc00.3-0xc01 (0.5)
| | | rbsp{}: 0xc01-0xc01.7 (0.7)
| | | rbsp{}: 0xc01-0xc03.1 (2.1)
0x0c00| 9a | . | first_mb_in_slice: 0 0xc01-0xc01.1 (0.1)
0x0c00| 9a | . | slice_type: "p" (5) 0xc01.1-0xc01.6 (0.5)
0x0c00| 9a | . | pic_parameter_set_id: 0 0xc01.6-0xc01.7 (0.1)
0x0c00| 9a 22 6c 42 bf fe 38 85 de c2 03 1a de 79 0a| ."lB..8......y.| gap0: raw bits 0xc01.7-0xd49 (327.1)
0x0c00| 9a 22 | ." | frame_num: 1 0xc01.7-0xc02.3 (0.4)
0x0c00| 22 6c | "l | pic_order_cnt_lsb: 4 0xc02.3-0xc03.1 (0.6)
0x0c00| 6c 42 bf fe 38 85 de c2 03 1a de 79 0a| lB..8......y.| gap0: raw bits 0xc03.1-0xd49 (325.7)
0x0c10|56 fd b3 4b b4 0f 24 7f e9 d3 b6 f2 5e 6f dd b7|V..K..$.....^o..|
* |until 0xd48.7 (328) | |
* |until 0xd48.7 (326) | |
|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef| [2][0:1]: sample (avc_au) 0xd49-0xd81 (56)
| | | [0]{}: nalu 0xd49-0xd81 (56)
0x0d40| 00 00 00 34 | ...4 | length: 52 0xd49-0xd4d (4)
|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef| nalu{}: (avc_nalu) 0xd4d-0xd81 (52)
0x0d40| 01 | . | forbidden_zero_bit: false 0xd4d-0xd4d.1 (0.1)
0x0d40| 01 | . | nal_ref_idc: 0 0xd4d.1-0xd4d.3 (0.2)
0x0d40| 01 | . | nal_unit_type: "slice" (1) (Coded slice of a non-IDR picture) 0xd4d.3-0xd4e (0.5)
| | | rbsp{}: 0xd4e-0xd4e.7 (0.7)
| | | rbsp{}: 0xd4e-0xd50.1 (2.1)
0x0d40| 9e | . | first_mb_in_slice: 0 0xd4e-0xd4e.1 (0.1)
0x0d40| 9e | . | slice_type: "b" (6) 0xd4e.1-0xd4e.6 (0.5)
0x0d40| 9e | . | pic_parameter_set_id: 0 0xd4e.6-0xd4e.7 (0.1)
0x0d40| 9e 41| .A| gap0: raw bits 0xd4e.7-0xd81 (50.1)
0x0d50|79 0a ff 01 f9 2d 04 d3 29 fe 4d 76 42 26 f6 cd|y....-..).MvB&..|
* |until 0xd80.7 (51) | |
0x0d40| 9e 41| .A| frame_num: 2 0xd4e.7-0xd4f.3 (0.4)
0x0d40| 41| A| pic_order_cnt_lsb: 2 0xd4f.3-0xd50.1 (0.6)
0x0d50|79 |y |
0x0d50|79 0a ff 01 f9 2d 04 d3 29 fe 4d 76 42 26 f6 cd|y....-..).MvB&..| gap0: raw bits 0xd50.1-0xd81 (48.7)
0x0d60|13 |. |
* |until 0xd80.7 (49) | |
| | | id: 1
| | | data_format: "avc1" (Advanced Video Coding)
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