mirror of
https://github.com/wader/fq.git
synced 2024-12-18 02:41:44 +03:00
97 lines
2.8 KiB
Go
97 lines
2.8 KiB
Go
package mpeg
|
|
|
|
import (
|
|
"github.com/wader/fq/format"
|
|
"github.com/wader/fq/format/registry"
|
|
"github.com/wader/fq/pkg/decode"
|
|
)
|
|
|
|
func init() {
|
|
registry.MustRegister(&decode.Format{
|
|
Name: format.AVC_PPS,
|
|
Description: "H.264/AVC Picture Parameter Set",
|
|
DecodeFn: avcPPSDecode,
|
|
})
|
|
}
|
|
|
|
// TODO:
|
|
// ffmpeg does: get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80
|
|
// we do: there is more than trailing rbsp left
|
|
func moreRBSPData(d *decode.D) bool {
|
|
l := d.BitsLeft()
|
|
return l > 8 //|| (l == 8 && d.PeekBits(8) != 1)
|
|
}
|
|
|
|
func avcPPSDecode(d *decode.D, in interface{}) interface{} {
|
|
fieldUEV(d, "pic_parameter_set_id")
|
|
fieldUEV(d, "seq_parameter_set_id")
|
|
d.FieldBool("entropy_coding_mode_flag")
|
|
d.FieldBool("bottom_field_pic_order_in_frame_present_flag")
|
|
numSliceGroupsMinus1 := fieldUEV(d, "num_slice_groups_minus1")
|
|
if numSliceGroupsMinus1 > 0 {
|
|
sliceGroupMapType := fieldUEV(d, "slice_group_map_type")
|
|
switch sliceGroupMapType {
|
|
case 0:
|
|
d.FieldArrayFn("slice_groups", func(d *decode.D) {
|
|
for i := uint64(0); i <= numSliceGroupsMinus1; i++ {
|
|
fieldUEV(d, "slice_group")
|
|
}
|
|
})
|
|
case 2:
|
|
d.FieldArrayFn("slice_groups", func(d *decode.D) {
|
|
for i := uint64(0); i <= numSliceGroupsMinus1; i++ {
|
|
d.FieldStructFn("slice_group", func(d *decode.D) {
|
|
fieldUEV(d, "top_left")
|
|
fieldUEV(d, "bottom_right")
|
|
})
|
|
}
|
|
})
|
|
case 3, 4, 5:
|
|
d.FieldArrayFn("slice_groups", func(d *decode.D) {
|
|
for i := uint64(0); i <= numSliceGroupsMinus1; i++ {
|
|
d.FieldStructFn("slice_group", func(d *decode.D) {
|
|
d.FieldBool("change_direction_flag")
|
|
fieldUEV(d, "change_rate_minus1")
|
|
})
|
|
}
|
|
})
|
|
case 6:
|
|
picSizeInMapUnitsMinus1 := fieldUEV(d, "pic_size_in_map_units_minus1")
|
|
for i := uint64(0); i <= picSizeInMapUnitsMinus1; i++ {
|
|
d.FieldStructFn("slice_group", func(d *decode.D) {
|
|
d.FieldBool("id")
|
|
})
|
|
}
|
|
}
|
|
}
|
|
|
|
fieldUEV(d, "num_ref_idx_l0_default_active_minus1")
|
|
fieldUEV(d, "num_ref_idx_l1_default_active_minus1")
|
|
d.FieldBool("weighted_pred_flag")
|
|
d.FieldU2("weighted_bipred_idc")
|
|
fieldSEV(d, "pic_init_qp_minus26") /* relative to 26 */
|
|
fieldSEV(d, "pic_init_qs_minus26") /* relative to 26 */
|
|
fieldSEV(d, "chroma_qp_index_offset")
|
|
d.FieldBool("deblocking_filter_control_present_flag")
|
|
d.FieldBool("constrained_intra_pred_flag")
|
|
d.FieldBool("redundant_pic_cnt_present_flag")
|
|
|
|
// TODO: more_data() is there non-zero bits left?
|
|
if moreRBSPData(d) {
|
|
d.FieldBool("transform_8x8_mode_flag")
|
|
picScalingMatrixPresentFlag := d.FieldBool("pic_scaling_matrix_present_flag")
|
|
if picScalingMatrixPresentFlag {
|
|
d.FieldArrayFn("pic_scaling_list", func(d *decode.D) {
|
|
for i := 0; i < 6; i++ {
|
|
d.Bool()
|
|
}
|
|
})
|
|
}
|
|
fieldSEV(d, "second_chroma_qp_index_offset")
|
|
}
|
|
|
|
d.FieldBitBufLen("rbsp_trailing_bits", d.BitsLeft())
|
|
|
|
return nil
|
|
}
|