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sei.rs
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sei.rs
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//! SEI syntax element decoding.
use crate::common::data_structures::SEIBufferingPeriod;
use crate::common::data_structures::SEIFilmGrainCharacteristics;
use crate::common::data_structures::SEINalu;
use crate::common::data_structures::SEIPayload;
use crate::common::data_structures::SEIPicTiming;
use crate::common::data_structures::SEIRecoveryPoint;
use crate::common::data_structures::SEIUserDataUnregistered;
use crate::common::data_structures::SeqParameterSet;
use crate::common::data_structures::UUID_APPLE1;
use crate::common::data_structures::UUID_APPLE2;
use crate::common::helper::decoder_formatted_print;
use crate::common::helper::ByteStream;
use crate::decoder::expgolomb::exp_golomb_decode_one_wrapper;
use log::debug;
use std::collections::VecDeque;
/// Follows section 7.3.2.3
pub fn decode_sei_message(spses: &Vec<SeqParameterSet>, bs: &mut ByteStream) -> SEINalu {
let mut res = SEINalu::new();
if bs.bytestream.len() < 2 {
println!("[WARNING] SEI NALU too short: {}", bs.bytestream.len());
return res;
}
loop {
let mut payload_type = 0;
let mut next_byte = bs.read_bits(8);
while next_byte == 0xff {
next_byte = bs.read_bits(8);
payload_type += 255;
}
payload_type += next_byte;
let mut payload_size = 0;
let mut next_byte = bs.read_bits(8);
while next_byte == 0xff {
next_byte = bs.read_bits(8);
payload_size += 255;
}
// in number of bytes
payload_size += next_byte;
res.payload_type.push(payload_type);
res.payload_size.push(payload_size);
res.payload
.push(decode_sei_payload(payload_type, payload_size, spses, bs));
// if we don't have enough bytes for a new payload and size, then break
if !bs.more_data() && bs.bytestream.len() < 2 {
break;
}
}
return res;
}
/// D.1.1 General SEI message syntax
fn decode_sei_payload(
payload_type: u32,
payload_size: u32,
spses: &Vec<SeqParameterSet>,
bs: &mut ByteStream,
) -> SEIPayload {
let mut res = SEIPayload::new();
println!("\t\tSEI: payload_type {}", payload_type);
println!("\t\tSEI: payload_size {}", payload_size);
decoder_formatted_print("SEI: payload_type", &payload_type, 63);
decoder_formatted_print("SEI: payload_size", &payload_size, 63);
// this currently only matches the types of a target decoder
match payload_type {
0 => {
// buffering period
res.buffering_period = decode_buffering_period(spses, bs);
res.available = true;
}
1 => {
// picture timing
let sps: SeqParameterSet;
if spses.len() > 0 {
sps = spses[spses.len() - 1].clone();
} else {
sps = SeqParameterSet::new();
}
res.pic_timing = decode_pic_timing(&sps, bs);
res.available = true;
}
2 => {
// pan scan rect
decode_pan_scan_rect(payload_size, bs);
}
3 => {
// filler payload
decode_filler_payload(payload_size, bs);
}
4 => {
// user data registered ITU T T35
decode_user_data_registered_itu_t_t35(payload_size, bs);
}
5 => {
// Unregistered user data
res.unregistered_user_data = decode_user_data_unregistered(payload_size, bs);
res.available = true;
}
6 => {
// recovery point
res.recovery_point = decode_recovery_point(bs);
res.available = true;
}
7 => {
// pic marking repetition
decode_ref_pic_marking_repetition(payload_size, bs);
}
8 => {
// spare pic
decode_spare_pic(payload_size, bs);
}
9 => {
// scene info
decode_scene_info(payload_size, bs);
}
10 => {
// sub seq info
decode_sub_seq_info(payload_size, bs);
}
11 => {
// sub seq layer characteristics
decode_sub_seq_layer_characteristics(payload_size, bs);
}
12 => {
// sub seq characteristics
decode_sub_seq_characteristics(payload_size, bs);
}
13 => {
// full_frame_freeze
decode_full_frame_freeze(payload_size, bs);
}
14 => {
decode_full_frame_freeze_release(payload_size, bs);
}
15 => {
decode_full_frame_snapshot(payload_size, bs);
}
16 => {
decode_progressive_refinement_segment_start(payload_size, bs);
}
17 => {
decode_progressive_refinement_segment_end(payload_size, bs);
}
18 => {
decode_motion_constrained_slice_group_set(payload_size, bs);
}
19 => {
res.film_grain_characteristics = decode_film_grain_characteristics(bs);
res.available = true;
}
20 => {
decode_deblocking_filter_display_preference(payload_size, bs);
}
21 => {
decode_stereo_video_info(payload_size, bs);
}
22 => {
decode_post_filter_hint(payload_size, bs);
}
23 => {
decode_tone_mapping_info(payload_size, bs);
}
24 => {
decode_scalability_info(payload_size, bs); // specified in Annex G
}
25 => {
decode_sub_pic_scalable_layer(payload_size, bs); // specified in Annex G
}
26 => {
decode_non_required_layer_rep(payload_size, bs); // specified in Annex G
}
27 => {
decode_priority_layer_info(payload_size, bs); // specified in Annex G
}
28 => {
decode_layers_not_present(payload_size, bs); // specified in Annex G
}
29 => {
decode_layer_dependency_change(payload_size, bs); // specified in Annex G
}
30 => {
decode_scalable_nesting(payload_size, bs); // specified in Annex G
}
31 => {
decode_base_layer_temporal_hrd(payload_size, bs); // specified in Annex G
}
32 => {
decode_quality_layer_integrity_check(payload_size, bs); // specified in Annex G
}
33 => {
decode_redundant_pic_property(payload_size, bs); // specified in Annex G
}
34 => {
decode_tl0_dep_rep_index(payload_size, bs); // specified in Annex G
}
35 => {
decode_tl_switching_point(payload_size, bs); // specified in Annex G
}
36 => {
decode_parallel_decoding_info(payload_size, bs); // specified in Annex H
}
37 => {
decode_mvc_scalable_nesting(payload_size, bs); // specified in Annex H
}
38 => {
decode_view_scalability_info(payload_size, bs); // specified in Annex H
}
39 => {
decode_multiview_scene_info(payload_size, bs); // specified in Annex H
}
40 => {
decode_multiview_acquisition_info(payload_size, bs); // specified in Annex H
}
41 => {
decode_non_required_view_component(payload_size, bs); // specified in Annex H
}
42 => {
decode_view_dependency_change(payload_size, bs); // specified in Annex H
}
43 => {
decode_operation_points_not_present(payload_size, bs); // specified in Annex H
}
44 => {
decode_base_view_temporal_hrd(payload_size, bs); // specified in Annex H
}
45 => {
decode_frame_packing_arrangement(payload_size, bs);
}
46 => {
decode_multiview_view_position(payload_size, bs); // specified in Annex H
}
47 => {
decode_display_orientation(payload_size, bs);
}
48 => {
decode_mvcd_scalable_nesting(payload_size, bs); // specified in Annex I
}
49 => {
decode_mvcd_view_scalability_info(payload_size, bs); // specified in Annex I
}
50 => {
decode_depth_representation_info(payload_size, bs); // specified in Annex I
}
51 => {
decode_three_dimensional_reference_displays_info(payload_size, bs); // specified in Annex I
}
52 => {
decode_depth_timing(payload_size, bs); // specified in Annex I
}
53 => {
decode_depth_sampling_info(payload_size, bs); // specified in Annex I
}
54 => {
decode_constrained_depth_parameter_set_identifier(payload_size, bs);
// specified in Annex J
}
56 => {
decode_green_metadata(payload_size, bs); // specified in ISO/IEC 23001-11
}
137 => {
decode_mastering_display_colour_volume(payload_size, bs);
}
142 => {
decode_colour_remapping_info(payload_size, bs);
}
144 => {
decode_content_light_level_info(payload_size, bs);
}
147 => {
decode_alternative_transfer_characteristics(payload_size, bs);
}
148 => {
decode_ambient_viewing_environment(payload_size, bs);
}
149 => {
decode_content_colour_volume(payload_size, bs);
}
150 => {
decode_equirectangular_projection(payload_size, bs);
}
151 => {
decode_cubemap_projection(payload_size, bs);
}
154 => {
decode_sphere_rotation(payload_size, bs);
}
155 => {
decode_regionwise_packing(payload_size, bs);
}
156 => {
decode_omni_viewport(payload_size, bs);
}
181 => {
decode_alternative_depth_info(payload_size, bs); // specified in Annex I
}
200 => {
decode_sei_manifest(payload_size, bs);
}
201 => {
decode_sei_prefix_indication(payload_size, bs);
}
202 => {
decode_annotated_regions(payload_size, bs);
}
205 => {
decode_shutter_interval_info(payload_size, bs);
}
_ => {
debug!(target: "decode","decode_sei_payload - payload_type {} reserved_sei_message", payload_type);
decode_reserved_sei_message(payload_size, bs);
}
}
// if not parsed, then just consume the payload_size number of bytes
if !res.available {
if (payload_size as usize) < bs.bytestream.len() {
bs.bytestream.drain(0..(payload_size as usize));
} else {
debug!(target: "decode","[WARNING] SEI Payload size {} larger than bytes available {} ", payload_size, bs.bytestream.len());
bs.bytestream.clear();
bs.byte_offset = 0;
}
}
// if stream is not byte aligned then read bit equal to 1 then 0 bits until byte aligned
if bs.byte_offset > 0 {
if bs.bytestream.len() > 0 {
bs.bytestream.pop_front();
bs.byte_offset = 0;
}
}
return res;
}
/// D.1.2 Buffering period SEI message syntax
fn decode_buffering_period(
spses: &Vec<SeqParameterSet>,
bs: &mut ByteStream,
) -> SEIBufferingPeriod {
let mut res = SEIBufferingPeriod::new();
res.seq_parameter_set_id = exp_golomb_decode_one_wrapper(bs, false, 0) as u32;
decoder_formatted_print(
"SEI (Buffering Period): seq_parameter_set_id",
&res.seq_parameter_set_id,
63,
);
let mut cur_sps_wrapper: Option<&SeqParameterSet> = None;
for i in (0..spses.len()).rev() {
if spses[i].seq_parameter_set_id == res.seq_parameter_set_id {
cur_sps_wrapper = Some(&spses[i]);
break;
}
}
let cur_sps: &SeqParameterSet;
match cur_sps_wrapper {
Some(x) => cur_sps = x,
_ => panic!(
"decode_buffering_period - SPS with id {} not found",
res.seq_parameter_set_id
),
}
// The variable NalHrdBpPresentFlag is derived as follows:
// - If any of the following is true, the value of NalHrdBpPresentFlag shall be set equal to 1:
// - nal_hrd_parameters_present_flag is present in the bitstream and is equal to 1,
// - the need for presence of buffering periods for NAL HRD operation to be present in the bitstream in buffering
// period SEI messages is determined by the application, by some means not specified in this Recommendation |
// International Standard.
// - Otherwise, the value of NalHrdBpPresentFlag shall be set equal to 0.
let nal_hrd_bp_present_flag = cur_sps.vui_parameters.nal_hrd_parameters_present_flag;
if nal_hrd_bp_present_flag {
res.nal_initial_cpb_removal_delay =
vec![0; cur_sps.vui_parameters.nal_hrd_parameters.cpb_cnt_minus1 as usize + 1];
res.nal_initial_cpb_removal_delay_offset =
vec![0; cur_sps.vui_parameters.nal_hrd_parameters.cpb_cnt_minus1 as usize + 1];
let bits_to_read = cur_sps
.vui_parameters
.nal_hrd_parameters
.initial_cpb_removal_delay_length_minus1
+ 1;
decoder_formatted_print(
"SEI (Buffering Period): initial_cpb_removal_delay_length_minus1+1",
&bits_to_read,
63,
);
decoder_formatted_print(
"SEI (Buffering Period): cpb_cnt_minus1",
&cur_sps.vui_parameters.nal_hrd_parameters.cpb_cnt_minus1,
63,
);
for sched_sel_idx in 0..=cur_sps.vui_parameters.nal_hrd_parameters.cpb_cnt_minus1 {
res.nal_initial_cpb_removal_delay[sched_sel_idx as usize] = bs.read_bits(bits_to_read);
decoder_formatted_print(
"SEI (Buffering Period): NAL initial_cpb_removal_delay[]",
&res.nal_initial_cpb_removal_delay[sched_sel_idx as usize],
63,
);
res.nal_initial_cpb_removal_delay_offset[sched_sel_idx as usize] =
bs.read_bits(bits_to_read);
decoder_formatted_print(
"SEI (Buffering Period): NAL initial_cpb_removal_delay_offset[]",
&res.nal_initial_cpb_removal_delay_offset[sched_sel_idx as usize],
63,
);
}
}
let vcl_hrd_bp_present_flag = cur_sps.vui_parameters.vcl_hrd_parameters_present_flag;
if vcl_hrd_bp_present_flag {
res.vcl_initial_cpb_removal_delay =
vec![0; cur_sps.vui_parameters.vcl_hrd_parameters.cpb_cnt_minus1 as usize + 1];
res.vcl_initial_cpb_removal_delay_offset =
vec![0; cur_sps.vui_parameters.vcl_hrd_parameters.cpb_cnt_minus1 as usize + 1];
let bits_to_read = cur_sps
.vui_parameters
.vcl_hrd_parameters
.initial_cpb_removal_delay_length_minus1
+ 1;
decoder_formatted_print(
"SEI (Buffering Period): initial_cpb_removal_delay_length_minus1+1",
&bits_to_read,
63,
);
decoder_formatted_print(
"SEI (Buffering Period): cpb_cnt_minus1",
&cur_sps.vui_parameters.vcl_hrd_parameters.cpb_cnt_minus1,
63,
);
for sched_sel_idx in 0..=cur_sps.vui_parameters.vcl_hrd_parameters.cpb_cnt_minus1 {
res.vcl_initial_cpb_removal_delay[sched_sel_idx as usize] = bs.read_bits(bits_to_read);
decoder_formatted_print(
"SEI (Buffering Period): VCL initial_cpb_removal_delay[]",
&res.vcl_initial_cpb_removal_delay[sched_sel_idx as usize],
63,
);
res.vcl_initial_cpb_removal_delay_offset[sched_sel_idx as usize] =
bs.read_bits(bits_to_read);
decoder_formatted_print(
"SEI (Buffering Period): VCL initial_cpb_removal_delay_offset[]",
&res.vcl_initial_cpb_removal_delay_offset[sched_sel_idx as usize],
63,
);
}
}
return res;
}
/// D.1.3 Picture timing SEI message syntax
fn decode_pic_timing(sps: &SeqParameterSet, bs: &mut ByteStream) -> SEIPicTiming {
let mut result = SEIPicTiming::new();
// From Page 460 of the H.264 Spec:
// The variable CpbDpbDelaysPresentFlag is derived as follows:
// - If any of the following is true, the value of CpbDpbDelaysPresentFlag shall be set equal to 1:
// - nal_hrd_parameters_present_flag is present in the bitstream and is equal to 1,
// - vcl_hrd_parameters_present_flag is present in the bitstream and is equal to 1,
// - the need for presence of CPB and DPB output delays in the bitstream in picture timing SEI messages is
// determined by the application, by some means not specified in this Recommendation | International Standard.
let cpb_dpb_delays_present_flag = sps.vui_parameters.nal_hrd_parameters_present_flag
|| sps.vui_parameters.vcl_hrd_parameters_present_flag;
decoder_formatted_print(
"SEI (Pic timing): cpb_dpb_delays_present_flag",
&cpb_dpb_delays_present_flag,
63,
);
if cpb_dpb_delays_present_flag {
// number of bits:The syntax element is a
// fixed length code having a length in bits given by cpb_removal_delay_length_minus1 + 1.
// The cpb_removal_delay is the
// remainder of a modulo 2^(cpb_removal_delay_length_minus1 + 1) counter.
// bits to read comes from
let cpb_bits_to_read;
let dpb_bits_to_read;
if sps.vui_parameters.nal_hrd_parameters_present_flag {
cpb_bits_to_read = sps
.vui_parameters
.nal_hrd_parameters
.cpb_removal_delay_length_minus1
+ 1;
dpb_bits_to_read = sps
.vui_parameters
.nal_hrd_parameters
.dpb_output_delay_length_minus1
+ 1;
} else {
// sps.vui_parameters.vcl_nal_hrd_parameters_present_flag is true
cpb_bits_to_read = sps
.vui_parameters
.vcl_hrd_parameters
.cpb_removal_delay_length_minus1
+ 1;
dpb_bits_to_read = sps
.vui_parameters
.vcl_hrd_parameters
.dpb_output_delay_length_minus1
+ 1;
}
result.cpb_removal_delay = bs.read_bits(cpb_bits_to_read);
// From section D.2.3 of the Spec:
// When vui_parameters.max_dec_frame_buffering is equal to 0, dpb_output_delay shall be equal to 0
result.dpb_output_delay = bs.read_bits(dpb_bits_to_read);
decoder_formatted_print(
"SEI (Pic timing): cpb_removal_delay",
&result.cpb_removal_delay,
63,
);
decoder_formatted_print(
"SEI (Pic timing): dpb_output_delay",
&result.dpb_output_delay,
63,
);
}
let pic_struct_present_flag = sps.vui_parameters.pic_struct_present_flag;
decoder_formatted_print(
"SEI (Pic timing): pic_struct_present_flag",
&pic_struct_present_flag,
63,
);
if pic_struct_present_flag {
result.pic_struct = bs.read_bits(4);
decoder_formatted_print("SEI (Pic timing): pic_struct", &result.pic_struct, 63);
let num_clock_ts;
// Table D-1 - Interpretation of pic_struct
match result.pic_struct {
0 => {
// (progressive) frame
// field_pic_flag shall be 0
// TopFieldOrderCnt == BottomFieldOrderCnt
num_clock_ts = 1;
}
1 => {
// top field
// field_pic_flag shall be 1
// bottom_field_flag shall be 0
num_clock_ts = 1;
}
2 => {
// bottom field
// field_pic_flag shall be 1
// bottom_field_flag shall be 1
num_clock_ts = 1;
}
3 => {
// top field, bottom field, in that order
// field_pic_flag shall be 0
// TopFieldOrderCnt <= BottomFieldOrderCnt
num_clock_ts = 2;
}
4 => {
// bottom field, top field, in that order
// field_pic_flag shall be 0
// TopFieldOrderCnt >= BottomFieldOrderCnt
num_clock_ts = 2;
}
5 => {
// top field, bottom field, top field repeated, in that order
// field_pic_flag shall be 0
// TopFieldOrderCnt <= BottomFieldOrderCnt
num_clock_ts = 3;
}
6 => {
// bottom field, top field, bottom field repeated, in that order
// field_pic_flag shall be 0
// TopFieldOrderCnt >= BottomFieldOrderCnt
num_clock_ts = 3;
}
7 => {
// frame doubling
// field_pic_flag shall be 0
// fixed_frame_rate_flag shall be 1
// TopFieldOrderCnt == BottomFieldOrderCnt
num_clock_ts = 2;
}
8 => {
// frame tripling
// field_pic_flag shall be 0
// fixed_frame_rate_flag shall be 1
// TopFieldOrderCnt == BottomFieldOrderCnt
num_clock_ts = 3;
}
9..=15 => {
panic!(
"SEI (Pic timing): Reserved value for pic_struct : {}",
result.pic_struct
);
}
_ => {
panic!(
"SEI (Pic timing): Out of bounds Pic_struct : {}",
result.pic_struct
);
}
}
for i in 0..num_clock_ts {
result.clock_timestamp_flag.push(1 == bs.read_bits(1));
decoder_formatted_print(
"SEI (Pic timing): clock_timestamp_flag[]",
&result.clock_timestamp_flag[i],
63,
);
let time_offset_length;
if sps.vui_parameters.nal_hrd_parameters_present_flag {
time_offset_length = sps.vui_parameters.nal_hrd_parameters.time_offset_length;
} else {
// sps.vui_parameters.vcl_nal_hrd_parameters_present_flag is true
time_offset_length = sps.vui_parameters.vcl_hrd_parameters.time_offset_length;
}
if result.clock_timestamp_flag[i] {
result.ct_type.push(bs.read_bits(2));
decoder_formatted_print("SEI (Pic timing): ct_type[]", &result.ct_type[i], 63);
result.nuit_field_based_flag.push(1 == bs.read_bits(1));
decoder_formatted_print(
"SEI (Pic timing): nuit_field_based_flag[]",
&result.nuit_field_based_flag[i],
63,
);
result.counting_type.push(bs.read_bits(5));
decoder_formatted_print(
"SEI (Pic timing): counting_type[]",
&result.counting_type[i],
63,
);
result.full_timestamp_flag.push(1 == bs.read_bits(1));
decoder_formatted_print(
"SEI (Pic timing): full_timestamp_flag[]",
&result.full_timestamp_flag[i],
63,
);
result.discontinuity_flag.push(1 == bs.read_bits(1));
decoder_formatted_print(
"SEI (Pic timing): discontinuity_flag[]",
&result.discontinuity_flag[i],
63,
);
result.cnt_dropped_flag.push(1 == bs.read_bits(1));
decoder_formatted_print(
"SEI (Pic timing): cnt_dropped_flag[]",
&result.cnt_dropped_flag[i],
63,
);
result.n_frames.push(bs.read_bits(8));
decoder_formatted_print("SEI (Pic timing): n_frames[]", &result.n_frames[i], 63);
if result.full_timestamp_flag[i] {
result.seconds_value.push(bs.read_bits(6));
decoder_formatted_print(
"SEI (Pic timing): seconds_value[]",
&result.seconds_value[i],
63,
);
result.minutes_value.push(bs.read_bits(6));
decoder_formatted_print(
"SEI (Pic timing): minutes_value[]",
&result.minutes_value[i],
63,
);
result.hours_value.push(bs.read_bits(5));
decoder_formatted_print(
"SEI (Pic timing): hours_value[]",
&result.hours_value[i],
63,
);
// push the flag values
result.seconds_flag.push(true);
result.minutes_flag.push(true);
result.hours_flag.push(true);
} else {
result.seconds_flag.push(1 == bs.read_bits(1));
decoder_formatted_print(
"SEI (Pic timing): seconds_flag[]",
&result.seconds_flag[i],
63,
);
if result.seconds_flag[i] {
result.seconds_value.push(bs.read_bits(6));
decoder_formatted_print(
"SEI (Pic timing): seconds_value[]",
&result.seconds_value[i],
63,
);
result.minutes_flag.push(1 == bs.read_bits(1));
decoder_formatted_print(
"SEI (Pic timing): minutes_flag[]",
&result.minutes_flag[i],
63,
);
if result.minutes_flag[i] {
result.minutes_value.push(bs.read_bits(6));
decoder_formatted_print(
"SEI (Pic timing): minutes_value[]",
&result.minutes_value[i],
63,
);
result.hours_flag.push(1 == bs.read_bits(1));
decoder_formatted_print(
"SEI (Pic timing): hours_flag[]",
&result.hours_flag[i],
63,
);
if result.hours_flag[i] {
result.hours_value.push(bs.read_bits(5));
decoder_formatted_print(
"SEI (Pic timing): hours_value[]",
&result.hours_value[i],
63,
);
} else {
result.hours_value.push(0);
}
} else {
result.minutes_value.push(0);
result.hours_flag.push(false);
result.hours_value.push(0);
}
} else {
result.seconds_value.push(0);
result.minutes_flag.push(false);
result.minutes_value.push(0);
result.hours_flag.push(false);
result.hours_value.push(0);
}
}
if time_offset_length > 0 {
result.time_offset.push(bs.read_bits(time_offset_length)); // i(v)
} else {
result.time_offset.push(0);
}
} else {
result.ct_type.push(0);
result.nuit_field_based_flag.push(false);
result.counting_type.push(0);
result.full_timestamp_flag.push(false);
result.discontinuity_flag.push(false);
result.cnt_dropped_flag.push(false);
result.n_frames.push(0);
result.seconds_value.push(0);
result.minutes_value.push(0);
result.hours_value.push(0);
result.seconds_flag.push(false);
result.minutes_flag.push(false);
result.hours_flag.push(false);
result.time_offset.push(0);
}
}
} else {
// TODO: Infer default values
// NOTE 6 - When pic_struct_present_flag is equal to 0, then in many cases default values may be inferred. In the absence of other
// indications of the intended display type of a picture, the decoder should infer the value of pic_struct as follows:
// - If field_pic_flag is equal to 1, pic_struct should be inferred to be equal to (1 + bottom_field_flag).
// - Otherwise, if TopFieldOrderCnt is equal to BottomFieldOrderCnt, pic_struct should be inferred to be equal to 0.
// - Otherwise, if TopFieldOrderCnt is less than BottomFieldOrderCnt, pic_struct should be inferred to be equal to 3.
// - Otherwise (field_pic_flag is equal to 0 and TopFieldOrderCnt is greater than BottomFieldOrderCnt), pic_struct should be
// inferred to be equal to 4.
// pic_struct is only a hint as to how the decoded video should be displayed on an assumed display type (e.g., interlaced or progressive)
// at an assumed display rate. When another display type or display rate is used by the decoder, then pic_struct does not indicate the
// display method, but may aid in processing the decoded video for the alternative display. When it is desired for pic_struct to have an
// effective value in the range of 5 to 8, inclusive, pic_struct_present_flag should be equal to 1, as the above inference rule will not
// produce these values.
}
return result;
}
/// D.1.4 Pan-scan rectangle SEI message syntax
fn decode_pan_scan_rect(_payload_size: u32, bs: &mut ByteStream) {
let pan_scan_rect_id = exp_golomb_decode_one_wrapper(bs, false, 0);
decoder_formatted_print(
"SEI (Pan-scan rectangle): pan_scan_rect_id",
&pan_scan_rect_id,
63,
);
let pan_scan_rect_cancel_flag = 1 == bs.read_bits(1);
decoder_formatted_print(
"SEI (Pan-scan rectangle): pan_scan_rect_cancel_flag",
&pan_scan_rect_cancel_flag,
63,
);
if !pan_scan_rect_cancel_flag {
let pan_scan_cnt_minus1 = exp_golomb_decode_one_wrapper(bs, false, 0);
decoder_formatted_print(
"SEI (Pan-scan rectangle): pan_scan_cnt_minus1",
&pan_scan_cnt_minus1,
63,
);
// prepare
let mut pan_scan_rect_left_offset = Vec::new();
let mut pan_scan_rect_right_offset = Vec::new();
let mut pan_scan_rect_top_offset = Vec::new();
let mut pan_scan_rect_bottom_offset = Vec::new();
for _ in 0..=pan_scan_cnt_minus1 {
pan_scan_rect_left_offset.push(exp_golomb_decode_one_wrapper(bs, true, 0));
decoder_formatted_print(
"SEI (Pan-scan rectangle): pan_scan_rect_left_offset",
&pan_scan_rect_left_offset,
63,
);
pan_scan_rect_right_offset.push(exp_golomb_decode_one_wrapper(bs, true, 0));
decoder_formatted_print(
"SEI (Pan-scan rectangle): pan_scan_rect_right_offset",
&pan_scan_rect_right_offset,
63,
);
pan_scan_rect_top_offset.push(exp_golomb_decode_one_wrapper(bs, true, 0));
decoder_formatted_print(
"SEI (Pan-scan rectangle): pan_scan_rect_top_offset",
&pan_scan_rect_top_offset,
63,
);
pan_scan_rect_bottom_offset.push(exp_golomb_decode_one_wrapper(bs, true, 0));
decoder_formatted_print(
"SEI (Pan-scan rectangle): pan_scan_rect_bottom_offset",
&pan_scan_rect_bottom_offset,
63,
);
}
let _pan_scan_rect_repetition_period = exp_golomb_decode_one_wrapper(bs, false, 0);
}
}
/// D.1.5 Filler payload SEI message syntax
fn decode_filler_payload(_payload_size: u32, _bs: &mut ByteStream) {}
/// D.1.6 User data registered by Rec. ITU-T T.35 SEI message syntax
fn decode_user_data_registered_itu_t_t35(payload_size: u32, bs: &mut ByteStream) {
let itu_t_t35_country_code = bs.read_bits(8);
decoder_formatted_print(
"SEI (ITU-T T.35 User Data): itu_t_t35_country_code",
&itu_t_t35_country_code,
63,
);
let mut i: u32 = if itu_t_t35_country_code == 0xff {
1
} else {
let itu_t_t35_country_code_extension_byte = bs.read_bits(8);
decoder_formatted_print(
"SEI (ITU-T T.35 User Data): itu_t_t35_country_code_extension_byte",
&itu_t_t35_country_code_extension_byte,
63,
);
2
};
loop {
let itu_t_t35_payload_byte = bs.read_bits(8);
decoder_formatted_print(
"SEI (ITU-T T.35 User Data): itu_t_t35_payload_byte",
&itu_t_t35_payload_byte,
63,
);
i += 1;
if i < payload_size {
break;
}
}
}
/// D.1.7 User data unregistered SEI message syntax
fn decode_user_data_unregistered(
mut payload_size: u32,
bs: &mut ByteStream,
) -> SEIUserDataUnregistered {
let mut res = SEIUserDataUnregistered::new();
if bs.bytestream.len() < (payload_size as usize) {
println!("[WARNING] decode_user_data_unregistered - Malformed SEI unit - payload_size {} doesn't match NALU content length {}", payload_size, bs.bytestream.len());
decoder_formatted_print(
"SEI (Unregistered User Data): bytestream contents",
&bs.bytestream.clone(),
63,
);
}
if bs.bytestream.len() < 16 {
println!("[WARNING] decode_user_data_unregistered - Not enough bytes for UUID");
}
for i in 0..16 {
res.uuid_iso_iec_11578[i] = bs.read_bits(8) as u8;
}
decoder_formatted_print(
"SEI (Unregistered User Data): uuid_iso_iec_11578",
&res.uuid_iso_iec_11578,
63,
);
// adjust the size for UUID
payload_size -= 16;
// switch to see what UUID value we're dealing with
match res.uuid_iso_iec_11578 {
UUID_APPLE1 => {
res.user_data_apple1.mystery_param1 = bs.read_bits(8);
// TODO: there is a derived parameter on if the above is less than 4, but we hold off for now
}
UUID_APPLE2 => {
res.user_data_apple2.mystery_param1 = bs.read_bits(8);
res.user_data_apple2.mystery_param2 = bs.read_bits(8);
res.user_data_apple2.mystery_param3 = bs.read_bits(8);
res.user_data_apple2.mystery_param4 = bs.read_bits(8);
res.user_data_apple2.mystery_param5 = bs.read_bits(8);
res.user_data_apple2.mystery_param6 = bs.read_bits(8);
res.user_data_apple2.mystery_param7 = bs.read_bits(8);
res.user_data_apple2.mystery_param8 = bs.read_bits(8);
}
_ => {
if (payload_size as usize) > bs.bytestream.len() {
debug!(target: "decode","SEI - payload_size {} larger than bytestream length {}: copying the rest", payload_size, bs.bytestream.len());
// just copy the rest of the data
res.user_data_payload_byte.extend(&bs.bytestream.clone());
// empty it out since everything is consumed
bs.bytestream = VecDeque::new();
bs.byte_offset = 0;
} else {
for _ in 0..payload_size {
let cur_byte = bs.read_bits(8) as u8;
res.user_data_payload_byte.push(cur_byte);
}
decoder_formatted_print(
"SEI (Unregistered User Data): user_data_payload_byte",
&res.user_data_payload_byte,
63,
);
}
}
}
res
}
/// D.1.8 Recovery point SEI message syntax
fn decode_recovery_point(bs: &mut ByteStream) -> SEIRecoveryPoint {
let mut res = SEIRecoveryPoint::new();
res.recovery_frame_cnt = exp_golomb_decode_one_wrapper(bs, false, 0) as u32;
decoder_formatted_print(
"SEI (Recovery point): recovery_frame_cnt",
&res.recovery_frame_cnt,
63,
);
res.exact_match_flag = 1 == bs.read_bits(1);
decoder_formatted_print(
"SEI (Recovery point): exact_match_flag",
&res.exact_match_flag,
63,
);
res.broken_link_flag = 1 == bs.read_bits(1);
decoder_formatted_print(
"SEI (Recovery point): broken_link_flag",
&res.broken_link_flag,
63,
);
res.changing_slice_group_idc = bs.read_bits(2) as u8;
decoder_formatted_print(
"SEI (Recovery point): changing_slice_group_idc",
&res.changing_slice_group_idc,
63,
);
res
}
/// D.1.9 Decoded reference picture marking repetition SEI message syntax
fn decode_ref_pic_marking_repetition(_payload_size: u32, _bs: &mut ByteStream) {}
/// D.1.10 Spare picture SEI message syntax
fn decode_spare_pic(_payload_size: u32, _bs: &mut ByteStream) {}