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package mpeg
// ISO/IEC 14496-15 AVC file format, 5.3.3.1.2 Syntax
// ISO_IEC_14496-10 AVC
// TODO: use avcLevels
import (
"github.com/wader/fq/format"
"github.com/wader/fq/pkg/decode"
"github.com/wader/fq/pkg/interp"
"github.com/wader/fq/pkg/scalar"
)
var avcDCRNALFormat decode.Group
func init() {
interp.RegisterFormat(
format.AVC_DCR,
&decode.Format{
Description: "H.264/AVC Decoder Configuration Record",
DecodeFn: avcDcrDecode,
Dependencies: []decode.Dependency{
{Groups: []*decode.Group{format.AVC_NALU}, Out: &avcDCRNALFormat},
},
})
}
var avcProfileNames = scalar.UintMapSymStr{
// 66: "constrained_baseline_profile", // (CBP, 66 with constraint set 1)
66: "baseline_profile",
88: "extended_profile",
77: "main_profile",
100: "high_profile",
//100: "Constrained High Profile", // (100 with constraint set 4 and 5)
110: "high_10_profile",
122: "high_422_profile",
244: "high_444_predictive_profile",
// 110: "High 10 Intra Profile", // (110 with constraint set 3)
// 122: "High 4:2:2 Intra Profile", // (122 with constraint set 3)
// 244: "High 4:4:4 Intra Profile", // (244 with constraint set 3)
44: "cavlc_444_intra_profile",
83: "scalable_baseline_profile",
86: "scalable_high_profile",
128: "stereo_high_profile",
134: "mfc_high_profile",
138: "multiview_depth_high_profile",
139: "enhanced_multiview_depth_high_profile",
}
// TODO: 1b contraint flag 1?
var avcLevelNames = scalar.UintMapSymStr{
10: "1",
//10: "1b"
11: "1.1",
12: "1.2",
13: "1.3",
20: "2",
21: "2.1",
22: "2.2",
30: "3",
31: "3.1",
32: "3.2",
40: "4",
41: "4.1",
42: "4.2",
50: "5",
51: "5.1",
52: "5.2",
60: "6",
61: "6.1",
62: "6.2",
}
// type avcLevel struct {
// Name string
// MaxMBPS uint64
// MaxFS uint64
// MaxDpbMbs uint64
// MaxBR uint64
// MaxCPB uint64
// MaxVmvR uint64
// MinCR uint64
// MaxMvsPer2Mb uint64
// }
// TODO: 1b contraint flag 1?
// var avcLevels = map[uint64]avcLevel{
// 10: {"1", 1485, 99, 396, 64, 175, 64, 2, 0},
// //10: {"1b", 1485, 99, 396, 128, 350, 64, 2, 0}, //
// 11: {"1.1", 3000, 396, 900, 192, 500, 128, 2, 0},
// 12: {"1.2", 6000, 396, 2376, 384, 1000, 128, 2, 0},
// 13: {"1.3", 11880, 396, 2376, 768, 2000, 128, 2, 0},
// 20: {"2", 11880, 396, 2376, 2000, 2000, 128, 2, 0},
// 21: {"2.1", 19800, 792, 4752, 4000, 4000, 256, 2, 0},
// 22: {"2.2", 20250, 1620, 8100, 4000, 4000, 256, 2, 0},
// 30: {"3", 40500, 1620, 8100, 10000, 10000, 256, 2, 32},
// 31: {"3.1", 108000, 3600, 18000, 14000, 14000, 512, 4, 16},
// 32: {"3.2", 216000, 5120, 20480, 20000, 20000, 512, 4, 16},
// 40: {"4", 245760, 8192, 32768, 20000, 25000, 512, 4, 16},
// 41: {"4.1", 245760, 8192, 32768, 50000, 62500, 512, 2, 16},
// 42: {"4.2", 522240, 8704, 34816, 50000, 62500, 512, 2, 16},
// 50: {"5", 589824, 22080, 110400, 135000, 135000, 512, 2, 16},
// 51: {"5.1", 983040, 36864, 184320, 240000, 240000, 512, 2, 16},
// 52: {"5.2", 2073600, 36864, 184320, 240000, 240000, 512, 2, 16},
// 60: {"6", 4177920, 139264, 696320, 240000, 240000, 8192, 2, 16},
// 61: {"6.1", 8355840, 139264, 696320, 480000, 480000, 8192, 2, 16},
// 62: {"6.2", 16711680, 139264, 696320, 800000, 800000, 8192, 2, 16},
// }
func avcDcrParameterSet(d *decode.D, numParamSets uint64) {
for i := uint64(0); i < numParamSets; i++ {
d.FieldStruct("set", func(d *decode.D) {
paramSetLen := d.FieldU16("length")
d.FieldFormatLen("nal", int64(paramSetLen)*8, &avcDCRNALFormat, nil)
})
}
}
func avcDcrDecode(d *decode.D) any {
d.FieldU8("configuration_version")
d.FieldU8("profile_indication", avcProfileNames)
d.FieldU8("profile_compatibility")
d.FieldU8("level_indication", avcLevelNames)
d.FieldU6("reserved0")
lengthSize := d.FieldU2("length_size", scalar.UintActualAdd(1))
d.FieldU3("reserved1")
numSeqParamSets := d.FieldU5("num_of_sequence_parameter_sets")
d.FieldArray("sequence_parameter_sets", func(d *decode.D) {
avcDcrParameterSet(d, numSeqParamSets)
})
numPicParamSets := d.FieldU8("num_of_picture_parameter_sets")
d.FieldArray("picture_parameter_sets", func(d *decode.D) {
avcDcrParameterSet(d, numPicParamSets)
})
if d.BitsLeft() > 0 {
d.FieldRawLen("data", d.BitsLeft())
}
// TODO:
// Compatible extensions to this record will extend it and will not change the configuration version code. Readers
// should be prepared to ignore unrecognized data beyond the definition of the data they understand (e.g. after
// the parameter sets in this specification).
// TODO: something wrong here, seen files with profileIdc = 100 with no bytes after picture_parameter_sets
// https://github.com/FFmpeg/FFmpeg/blob/069d2b4a50a6eb2f925f36884e6b9bd9a1e54670/libavcodec/h264_ps.c#L333
return format.AVC_DCR_Out{LengthSize: lengthSize}
}
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