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